rotatable switchable multi-core device based on permanent magnet

专利摘要:
ROTARY SWITCHING MULTINUCLEUS ELEMENT APPLIANCE BASED ON PERMANENT MAGNETO. The present invention relates to a method for creating and a device for a rotatable switchable multi-element apparatus based on permanent magnet, for attaching or lifting a target, comprised of two or more support plates, each containing a plurality of first and second complementary core elements. Each core element comprises permanent magnet (s) with magnetically matched mild steel pole conduits attached to the poles of the north and south magnet (s). Core elements are oriented inside adjacent support plates so that the relative rotation allows for the alignment in phase or out of phase of the north and south magnetic fields within the pole conduits. Aligning a first "in phase" core element with a second core element, that is, north-north / south-south, activates that pair of core elements, allowing the combined magnetic fields of the pole conduits to be directed to one target. Aligning the pair of core elements "out of phase", that is, north-south / south-north, deactivates that pair of core elements because it contains opposite fields within the (...).
公开号:BR112014013849B1
申请号:R112014013849-4
申请日:2012-11-28
公开日:2021-02-02
发明作者:Jim G. Michael
申请人:Creative Engineering Solutions, Inc.；
IPC主号:

专利说明:

Field of the Invention
[0001] Magnetic fields actuated manually in mandrels, supports and permanent magnet lifting devices have been used for decades in ferromagnetic materials (targets). Common applications are seen in mills, grinders, lathes, drills, and other industrial and commercial equipment. Other applications include device holders, tools and gauges, material alignment, and clamping devices. Various magnet-based elevators are used for material handling and robotic handling equipment. Unfortunately, most switchable permanent magnet arrays are expensive, difficult to manufacture, structurally weak, or relatively heavy. Consequently, the use of switchable permanent magnet arrays is very limited in the commercial and retail markets. Prohibitive costs represent a substantial barrier to integrating switchable permanent magnet arrays into end-user products. Attempts have been made to use these devices on automated devices and cranes, but the cost and difficulty of automating the act prevent real product acceptance. Efforts to develop switchable permanent magnet arrays for robotic retention incurred in problems with excessive depth of field, reliability to mechanically actuate multiple gears and inflexible magnetic performance that may not provide the desired target retention performance required to cover a desired range of thicknesses, shapes and sizes of material together with actuation torque issues.
[0002] Permanent magnets produce their own magnetic fields. Permanent magnets have both a north pole ("N") and a south pole ("S"). By definition, the direction of the local magnetic field is the direction that the north pole of a compass (or any magnet) tends to point. The magnetic field lines leave a magnet close to its north pole and enter close to its south pole. Within the magnet, the field lines return from the south pole back to the north pole. The "magnetic pole separation line" is used to represent a theoretical plane between the north and south poles of the permanent magnet. Permanent magnets are made of ferromagnetic materials such as iron and nickel that have been magnetized. The strength of a magnet is represented by its magnetic moment ("M"). For single magnets, the M points in the direction of a line drawn from the south pole to the north of the magnet. "Similar" magnetic poles repel each other when approached to each other (for example, N and N or S and S), while "opposite" magnetic poles attract each other (for example, N and S).
[0003] All permanent magnets and materials that are strongly attracted to them are ferromagnetic. When the magnetic moment of atoms within a given material can be placed in favor of a direction, it is said that they are "magnetizable". Ferromagnetism is the basic mechanism by which certain materials form or exhibit strong interactions with magnets.
[0004] A material that is magnetically soft is similar to permanent magnets in that it exhibits its own magnetic field when under the influence of an external magnetic field. However, the material does not continue to exhibit a magnetic field since the applied field is reduced to zero. These materials act as a "conduit" for transporting, concentrating, and forming magnetic fields.
[0005] Attaching an appropriately matched pole conduit (as described in the Detailed Description of the Invention) to either side of one of the magnetic magnet poles or permanent magnets defines a basic core element. The pole conduits contain and perpendicularly redirect one of the magnetic fields north and south of the permanent magnet to the upper and lower faces of the pole conduits. Each pole conduit attached to the permanent magnet now contains the magnetic field and pole direction of the permanent magnet so that one pole conduit of the core element contains the north field of the permanent magnet and the other pole conduit contains the south field of the permanent magnet .
[0006] Containing and redirecting the magnetic field within the pole conduits, similar poles have a simultaneous level of attraction and repulsion. The relative positioning of an upper core element with an adjacent lower core element defines a pair of core elements. Two or more pairs of core elements are critical for proper operation of the device. Aligning pole ducts of upper core elements with pole ducts of lower core elements "in phase", that is, north-north / south-south (NN / SS), activates the pair of core elements by making the magnetic fields combined of the available adjacent pole ducts attract a target. Aligning a pair of upper and lower core elements "out of phase", that is, north-south / south-north (N-S / S-N), results in the adjacent pole conduits containing opposite fields and deactivates the pair of core elements. In this disclosure, "deactivation" refers to a substantial cancellation of the magnetic field that emanates from the work surface.
[0007] A core element must function as a single entity and may require the retention of its separate components in a "core element receptacle" in order to facilitate the relative positioning of two or more core elements with respect to each other other. Detailed Description of the Invention
[0008] Ferromagnetic materials such as iron that shows saturation are composed of magnetic domains in microscopic regions that act as tiny permanent magnets. Before an external magnetic field is applied to the material, the magnetic domains are oriented in random directions and therefore cancel each other out. When an external magnetization field "H" is applied to the material, it penetrates the material and aligns the domains, causing its tiny magnetic fields to rotate and line up parallel to the external field, adding up to create a large magnetic field that extends out of the material. This is called "magnetization" (the stronger the external magnetic field, the more the domains align). Saturation occurs when virtually all magnetic domains are aligned, so that further increases in the applied field cannot cause additional alignment of the magnetic domains .
[0009] Target saturation is very similar to magnetic saturation in that since all magnetic domains in the material target directly under the pole or magnet conduit are saturated, any excess magnetic field cannot be absorbed. If a switchable permanent magnet produces a field in excess of what a target can absorb, the excess magnetic field will result in an increased actuation force. Actuation force is the force required to overcome the magnetic resistance between two or more upper and lower adjacent core elements when orienting a core element with respect to the adjacent core element so that they are aligned in phase (N-N / S-S). This excess magnetic field has to be overcome when rotating adjacent upper and lower support plates in phase. The actuation force to align pairs of core elements can be ten times greater in the air or on a very thin target than when on a target that does not fully saturate, that is, one that does not absorb the entire magnetic field.
[0010] Breaking force is the force required to separate a magnet perpendicularly from a target. Most magnets are tested on a target that is thick enough to avoid oversaturation in the area directly under the pole or poles. Since the breaking force is primarily a function of the pole conduit area and material saturation, it is the material and not the magnetic field that determines the breaking force once a target thickness has become saturated. For example, a magnet that has a breaking force of 100N (Newtons) in 25 mm of material thickness can also have a breaking force of 100N in 12 mm of material thickness, but the breaking force can drop to 70N in 6 mm material thickness and 10N in 2 mm material thickness.
[0011] Magnetic permeability (regardless of size since it is relative to the magnetic permeability of a vacuum or air) can often be considered as magnetic conductivity. There are essentially four categories of magnetically permeable substances: (1) Substances whose magnetic permeability is less than one are called diamagnetic. These substances to a very small extent produce an opposite magnetic field in response to a strong magnetic field. Because this response is often extremely weak, most non-physicists would consider diamagnetic substances to be magnetic; (2) Substances whose magnetic permeability is exactly one (1.00) are called non-magnetic. Air or vacuum has a magnetic permeability of one; (3) Substances with a magnetic permeability greater than one are called paramagnetic; and (4) Substances with a magnetic permeability much greater than one (100 to 100,000) are called ferromagnetic. This invention deals primarily with targets that are ferromagnetic.
[0012] Phase alignment occurs when two or more of the core element pole conduits on a lower plate are aligned and effectively adjacent to the same amount of core element pole conduits on an upper plate. For example, with reference to Figure 19, the first core element 403a and the second core element 403b are aligned out of phase when the first north pole conduit 405a of the upper core element is directly above the second south pole conduit 404b of the lower core element and the first south pole conduit 404a of the upper core element is directly above the second north pole conduit 405b of the lower core element.
[0013] In contrast, the core elements are aligned in phase when the first north pole conduit 405a of the first core element 403a is directly above the second north pole conduit 406b of the lower core element and the first south pole conduit 404a of the first core element 403a is directly above the second south pole conduit 407b of the second core element 403b. The phase alignment of core elements results in a repulsive force between the pole conduits (magnetic repulsion) in addition to a moderately strong external magnetic field. Alignment of out-of-phase core elements results in a strong attraction force (magnetic coupling) between the pole conduits together with a very small external magnetic field.
[0014] As previously illustrated, aligning or positioning a phase core element with another active core element (or actuating) a very strong external magnetic field, provided by a "magnetic coupling" in phase between the pole conduits that have a instant attractive and repulsive force. Core elements that are aligned out of phase also provide a "magnetic coupling". This out-of-phase "magnetic coupling" provides a very strong attraction force between adjacent pole conduits with little or no external magnetic field; that is, the external magnetic field is deactivated or disengaged. Phase elements in contact with an unsaturated ferromagnetic target have a smooth attraction force between the core elements.
[0015] Magnetic field lines provide a simple way to represent or draw the magnetic field. The magnetic field can be estimated at any point using the direction and density of the nearby field lines: Typically the stronger the magnetic field, the greater the density of the magnetic field lines. The magnetic field lines shown in Figure 25 provide a visible two-dimensional representation of a typical magnetic field. The "visible" field line shown is not exactly the same as that of an isolated magnet. The introduction of metal filings alters the magnetic field by acting as a pole conduit and redirects the magnetic field. Although filings are shown in a two-dimensional perspective, a three-dimensional field would look similar to an hourglass. Background of the Prior Art
[0016] Many patents that contain multiple magnets (now in the public domain) have the orientation of adjacent magnets in a repetitive north-south / north-south pattern, which is generally required to enable device activation and deactivation. Prior art examples often show a north-south / south-north soft iron pole orientation to maximize depth of field, as shown in US Patent 2,287,286 issued to J. Bing et al. (1942) Figure 1 - Prior Art ("the '286 Patent"), as well as newer devices such as US Patent 7,161,451 B2 submitted by Shen (2007) Figures 7A and 7B ("the' 451 Patent"). Configurations between adjacent magnets with an alternating north-south / south-north orientation should be avoided with the exception of those that have space or angle of action restrictions when using core elements in non-ferrous plates. In these cases, efforts should be made to minimize interaction between adjacent pole conduits to avoid damaging or impacting the available magnetic field.
[0017] US Patent 2,287,286 issued to J. Bing et al. (1942) (Figure 1 - Prior Art) ("the '286 Patent") identifies a switchable magnetic chuck 101 comprised of a plurality of sectors. soft iron 103 fixed to and extending axially from a non-magnetic disk-shaped plate with said sectors being circumferentially spaced providing diametrically opposed gaps 104 that extend the entire length of said sectors. Diametrically polarized cylindrical magnets 102 are positioned in openings within the soft iron sectors 103 slightly larger than the cylindrical diameter of the magnets 102 to allow rotation of the polarized magnets within the apparatus. Orienting the magnets 102 so that each soft iron sector 103 contains either two north pole conduits or two south pole conduits activates the soft iron sector 103, causing the combined magnetic fields available to attract a ferrous target. Orienting the magnets so that each soft iron sector 103 contains a north pole conduit and south pole conduit deactivates the soft iron sector. This basic principle is used in most modern multi-magnet switchable magnet designs today.
[0018] US Patent 7,012,495 B2 granted to Kocijan (2006) (Figure 2A - Prior Art) ("the '495 Patent") identifies a switchable magnet configuration 105 comprised of a receptacle 106a and 106b that contains a first permanent magnet 109, second permanent magnet 111, positioning features 112 and 113, and actuating means (114, 41,116, 117, 118,119 and 120) to cause relative rotation between the first and second magnets. The permanent magnets 109 and 111 are diametrically polarized so that the south pole 110 of the lower permanent magnet 109 is aligned with the receptacle 106a and the north pole 108 of the lower magnet is aligned with the receptacle 106b. When compared to the single magnet version of the '286 Patent, the primary difference is the use in the' 495 Patent of a second magnet for field cancellation instead of deflecting fields. The relative rotation between the upper permanent magnet 111 and the lower permanent magnet 109 allows a more effective means of canceling the magnetic field when the magnets are oriented north-south.
[0019] The functional design described by the '495 Patent is commercially available and represented by Figure 2B - Prior Art and Figure 2C - Prior Art. The lower magnet 126 is attached to the one-piece receptacle 121 (snap fit and / or glued) with a diametrically polarized magnetic field line 127 perpendicular to the thin wall of the receptacle 125. A low-friction disc 128 is inserted into the one-piece receptacle 121 between the lower magnet 126 and the upper magnet 129. The rotation of the upper magnet 129 is accomplished through the use of drill holes 130 and 131 to accommodate a mechanical connection 132. In order to rotate the upper magnet 129 with respect to the lower magnet 126, clearance 124 is required between the one-piece receptacle 121 and the upper magnet 129. The clearance can be obtained by machining a larger diameter around the position of the upper magnet 129 in the one-piece receptacle 121 or using an upper magnet 129 with a smaller diameter than the lower magnet 126. The magnetic fields of the upper and lower magnets 129 and 126 are directed respectively in the south pole conduit 122a and in the north pole conduit 122b.
[0020] That said, the design described by the '495 Patent requires strict manufacturing tolerances and is relatively expensive to produce. The manufacture of the one-piece receptacle 121 is intensive in both material and labor. Machining the one-piece receptacle 121 (Figures 2B and 2C - Prior Art) requires the use of relatively thick solid material (more than twice the thickness of any magnet) that is mostly removed by machining. The gap 124 must have a very smooth finish and / or high performance lubricants to avoid rapid scraping of the deposition of the upper magnet 129 when rotated. The gap 124 must also accommodate the tolerances of the upper magnet 129. The rotation of the upper magnet 129 also requires that drill holes 130 and 131 or other actuating features be machined in the upper magnet 129. These features not only weaken integrity of the upper magnet (exposing it to possible breakage), but negatively affects the quality of the magnetic field. Permanent magnets are made of exceptionally hard brittle materials that oxidize quickly in the air. This is particularly true for neodymium magnets (dFeB - boron neodymium iron). Because it has to attach a mechanical connection 132 to the upper magnet 129, the magnet manufacturer has to produce custom-made magnets that have drill holes 130 and 131 or, as shown in Figure 2A - Prior Art, other positioning features 112 and 113 machined in permanent magnet 111 before magnetizing and plating. This often requires long lead times, expensive tools, large volume purchases, and large prototype expenses, due to the difficulty in machining the very hard NdFeB material. In addition, drill holes 130 and 131 must be positioned precisely on the magnetic field line. This is often challenging since the gaps in the magnets were not magnetized at this point. The orientation of the magnet gaps requires isostatic pressure in the presence of a magnetic field. Positioning the drill holes precisely next to the magnetic field line 127 (Figures 2B and 2C - Prior Art) is often difficult, and if the location is outside more than a few degrees, it results in poor performance of the permanent magnet switchable devices. The required diametrically polarized disc magnets also inherently have reduced magnetic efficiency when size increases.
[0021] The additional problem of the '495 Patent is the need for action at the top. Because the upper magnet 129 (Figure 2C - Prior art) is inserted in the receptacle, the action must take place on the receptacle. It is often desirable to attach a device to the top surface of the switchable magnet apparatus. Attachment to the device described in the '495 Patent is often made to one of the vertical sides (resulting in an off-center load) or to a larger hitch-type assembly that is attached to vertical surfaces of the south pole duct 122a and north pole duct Opposite 122b. Care must be taken to ensure that a ferrous target does not come into contact with the vertical flat surface of the one-piece receptacle 121, as this will pull the magnetic field towards the ferrous target, substantially weakening the magnetic grip on the work surface. bottom of the receptacle.
[0022] US Patent 4,329,673 issued to Uchikune (1982) ("the '673 Patent"), (Figure 3 - Prior Art) describes a switchable magnet 150 that uses a magnetic bypass method to disable a device switchable magnet. This actuation method is still in use today, however its performance is not as efficient as the '495 Patent and other patents that use magnetic cancellation methods of permanent adjacent magnets and their respective pole ducts. This design operates on a bypass principle, which combines the magnetic fields of north pole 155 and south pole 154 contained within a magnet in a relatively large pole conduit 151 and 152 for magnetic field cancellation. The pole ducts 151 and 152 are separated by a non-ferrous material 153. The pole ducts are relatively large since the magnetic field cancellation occurs by the combination of the north pole 155 and south pole 154 magnetic fields of a single magnet instead of a magnetic field of a separate magnet positioned out of phase with respect to a fixed magnet. When deflecting a single magnet, the north pole magnetic field and south pole magnetic field are oriented at opposite ends, 180 ° apart. In order for the fields to "deflect" or neutralize each other, they must completely reverse the direction within the pole ducts 151 and 152. In order to properly disconnect the device, sufficient steel must be used to allow the fields reverse direction and absorb any residual magnetic field entirely within each pole conduit, as there is no magnetic field denial occurring within the magnet itself as is the case with the newer patents such as "the 495 Patent" and the "Patent 451 ". By reducing the size of the pole ducts 151 and 152, more of the magnetic field is available to attract the target, in order to improve the performance ratio for the weight of the magnet.
[0023] US Patent Application Publication No. US 2009/0027149 Al (Kocijan) (January 29, 2006) ("Publication 149") describes a method and device for self-regulating flow transfer using an array of permanent switchable magnets. In this project, the author uses different orientations from the magnets and respective pole pieces to create a "self-regulating" flow transfer, the purpose of which is to have a magnetic depth of field of automatic adaptation to match the saturation level of the target material. This complex pole orientation and geometrical spacing of individual switchable magnets has apparently been developed in an attempt to prevent an excessively deep magnetic field from penetrating through more than one sheet of metal, thereby squeezing two or more sheets when intending to lift only one. Figure 4B - Prior Art demonstrates one of the preferred modalities of this Publication. In this configuration, each adjacent switchable magnet is oriented with opposite magnet fields located adjacent to each other; that is, north-south / north-south, etc. In theory, this configuration is intended to allow the permanent switchable magnets to lift a single piece of sheet metal from a stack of thin sheet metal. The theory is that once a thin metal target becomes magnetically saturated, any residual excess flux or remaining magnetic field must be redirected "automatically" to the opposite adjacent pole ducts and are not available to attract another sheet of metal below of the first sheet. Although careful experimentation under precise conditions shows that this is possible, the resulting field tightness of the intended thin target is substantially decreased, as there is no method to stop redirecting the magnetic field once the sheet of metal has been separated from the pile of sheet metal, reduces maximum performance dramatically.
[0024] Compare the switchable magnet pole guidelines (Figure 4B - Prior technique) of the "self-regulated flow transfer" method presented by Publication '149, to the pole conduit provision presented by the' 286 Patent (Figure 4A - Prior Art) shows that the layout represented in Publication '149 has been in use since the' 286 Patent. Magnets 160 are rotated 180 ° to illustrate the similarities in the orientation of the magnets between the '286 Patent and the' 149 Publication. Figure 4A - Prior art shows the device in a deactivated configuration. Figure 4C - Prior Art is a representation of Figure 4A - Prior Art (Patent '286), superimposed on Figure 4B Prior Art (Publication' 149). In Figure 4A, the magnets are oriented in the same way as in Figure 4B in order to disable the device. However, in Figure 4B a gap 164 is intentionally created between the north pole duct 163 and the south pole duct 165 for the purpose of reducing or weakening the magnetic field as opposed to deactivating it when there is no separation between the duct north pole 163 and south pole conduit 165. Enough clearance 164 provides separation between conduit fields from opposite south and north poles that will produce the negligible field weakening effect when magnetic field cancellation falls into an exponential 'non-ferrous' relationship . In addition, the performance of the apparatus defined in Publication '149 on thicker materials is typically less than 50% of the performance of the combined clamping force of the individual switchable magnets.
[0025] Figure 5 - Prior art represented in Publication '149 identifies another possible orientation referenced as a "star matrix" of permanent magnets so that the pole ducts are positioned radially to the center and alternated north-south / north-south in adjacent magnets. A purpose of the "star matrix" configuration depicted in Figure 5 - Prior Art is not identified by Kocijan in Publication ‘149 due to the substantial unpredictable imbalance of the internal magnetic field 167 and external magnetic field 166 caused by the different spacing of opposite magnetic fields; however, Publication ''49 identifies the "star matrix" as another variation of a "closed system" without identifying a possible purpose for this configuration. Closed magnetic field systems such as one described by Publication ‘149 have been in the public domain for more than 40 years.
[0026] The limitations of the project described by Publication ‘149 are substantial. The maximum performance of the unit is limited to the sum of the individual permanent magnets and respective poles. The difficulty of activating the individual magnets is substantial as described in more detail below. Optimizing a broad-based solution is extremely difficult, if not impossible. The tolerance requirements are excessive. Bending of thin materials during lifting would likely cause a lifting failure since the individual magnets and poles cannot maintain intimate contact due to the small diameter of the contact.
[0027] Although Publication '149' makes no attempt to patent the identified actuation method shown in Figures 6A and 6B - Prior Art, it depicts and highlights the complex and challenging nature of activating an array of individual switchable magnets. The cost of the pneumatic mechanism of the switching mechanism 170 is easily 50 times the cost of the switchable magnets and pole ducts. The operation of this device requires rotating each upper magnet with a slit 171 180 ° in all the switchable magnets 172a, 172b and 172c. Gears or non-magnetic drivers must be attached to each upper magnet with slot 171 in each switchable magnet 172a, 172b and 172c, together with a central gear to drive them simultaneously. The precise fixing of a gear or driver for the 171 nickel-plated slotted top magnet is challenging to say the least. In addition, the slotted top magnet clearance requirements 171 for the single piece housing the south pole duct 173a and north pole duct 173b result in considerable clearance within the gear mechanism, allowing the possibility to skip the gear tooth. . To complicate matters, one of the claims warns that "a carrier 174 and 175 must be designed to allow limited displacement of the magnets with respect to each other". This is highly unrealistic due to the inflexible nature of the drive mechanism assembly required to rotate all of the individual upper magnets. Similarities in Magnet Orientation - The patent application submitted for a Permanent Magnet Based Rotary Switchable Element Appliance, hereinafter referred to as a Rotary Switchable Magnet or RSM, has many magnet orientation configurations, with the preferred mode being alternating pairs; that is, north-north / south-south, north-north / south-south. However, since the mechanism by which the core elements act requires inversions of orientation, some configurations can be positioned in north-south / north-south.
[0028] RSM demonstrates much simpler methods to actuate a large number of magnets and poles, and it does so without the need for expensive and complex actuating mechanisms such as the apparatus described in Figure 6A. While it may appear that there are slight similarities in the orientation of the core element between the RSM (Figure 11) and the "star matrix" described by Publication '149 (Figure 4), the purposes of the guidelines are completely different. As previously shown in "Patent 286", an alternating north - south arrangement between adjacent magnets and respective pole ducts, dates back to 1942. In the RSM design, an alternating arrangement is used to allow overlapping of upper and lower core elements with the purpose of enabling or disabling the core element pair. The position of the core element is determined by device size, target thickness variation, target weight or desired clamping force, availability and economy of the magnet. It is the order's intention to maximize the clamping force of each magnet. In the case of Publication '149 "the Star Matrix" merely has a "unique" field layout that has unusual magnetic characteristics that vary depending on where the magnetic field is measured. The internal magnetic field 167 (Figure 5 - Prior art) would have a small magnetic force, while the external magnetic field 166 would be stronger.
[0029] The inventor of RSM recognizes the need to avoid excessive depth of field when the intention is to lift a single thin sheet of steel from a pile of metal sheets. The proposed RSM design also provides a method that is capable of dynamically adapting its depth of field over a predefined range without operator intervention. This will be discussed further in the Detailed Description of the Invention section. US Patent 7,161,451 B2 issued to Shen (2007) (Figures 7A, 7B and 8 - Prior Art) ("the '451 Patent") identifies a magnetic mandrel 180 comprised of an upper mandrel layer 181a and lower mandrel 181b with a common center of rotation 182, a common periphery 183 and parallel upper and lower flat surface 184, where one of the flat mandrel layer surfaces is the work surface 185. Each permanent magnet plate 186a has an end internal at the center of rotation 182 which extends outwardly to the periphery 183, with the soft magnet blocks 187a larger than the adjacent permanent magnet plate 186a. The upper mandrel layer 181a is comprised of a soft magnetic block 187a, interposed between each pair of magnetized permanent magnet plates 186a and 188a around the center of rotation 182. The second mandrel layer is comprised of soft magnetic block 187b, interposed between the permanent magnet plates 186b and 188b which are complementary in shape and position to the soft magnetic block 187a interposed between the permanent magnet plates 186a and 188a of the first mandrel layer.
[0030] Rotating the upper mandrel layer 181a with respect to the fixed mandrel layer 181b so that the upper soft magnet blocks 187a in each layer are aligned north to north with the lower soft magnetic block 187b results in activation. Conversely, rotating the upper mandrel layer 181a with respect to the fixed mandrel lower layer 181b so that the upper soft magnet blocks 187a in each layer are aligned north and south with respect to the lower soft magnet blocks 189b results in deactivation of the apparatus . The functional design described by the '451 patent is not known to be commercially available. Although it is a theoretically viable project, the project described by the '451 Patent has considerable problems that are difficult to overcome. Most importantly as shown in Figure 8 - Prior Art, disabling mandrel 190 by rotating mandrel 191a top layer relative to mandrel 191b bottom layer when no target or thin target is on the work surface, results in very high friction in the area 192 contact between the mandrel plates, making it very difficult to act and causing wear or premature skinning between the two mandrels. The finishing of the upper and lower magnet blocks 193a and 193b respectively is critical to minimize the actuation torque and is again an expensive and difficult production process. The project requires very strict manufacturing tolerances and is expensive to produce. In addition, the use of multiple separate upper and lower magnet blocks 193a and 193b substantially weakens the integrity of each layer of the mandrel, thus requiring additional reinforcement of the upper and lower plates 195a and 195b respectively, as well as the use of the plate support. upper 194 and external structural receptacle 196 and 197 which also requires a considerable amount of non-ferrous fasteners and holes. Used fasteners, unless specifically made of magnetically soft materials, will retain magnetic flux that will prevent complete deactivation. Very small machining variations in the production of the individual upper and lower magnet blocks 193a and 193b respectively, as well as the upper permanent magnet plates 198a and lower permanent magnet plates 198b will result in mechanical interference during rotation, potentially causing bonding of the layers of the mandrel in the outer receptacle, additionally composed of the very strong attraction force between the mandrel layers. The tolerance to variations in thickness of the permanent magnet plates will also make the upper and lower layers of the mandrel 191a and 191b respectively, no longer cylindrical or flat on the upper and lower surfaces of the mandrel layers, due to the change in size and shape when assembled. This will likely require a post-machining process for the chuck plates assembled with active magnetic components to ensure a flat top and bottom surface on each chuck - a discouraging production operation. An additional problem with the design of the '451 Patent is the need to act on the top 199. The use of separate upper and lower magnet blocks 193a and 193b respectively, and upper permanent magnet plates 198a and lower permanent magnet plates 198b determines that an external structural receptacle 196 and 197 and upper plate support 194 are used to encapsulate all separate components, particularly the mandrel lower layer 191b. Often an eye hook or other method of fixing to the top surface of the mandrel is required where actuation on the top 199 occurs and it would be highly preferable to act on the side leaving the top surface available for fixing means. Although a laterally actuated unit is possible with this design, this would further complicate the support structure.
[0031] Comparison of the Invention to the Prior Art - The RSM described and claimed in this document has significant advantages when compared to the prior art: - Ease of actuation: The actuation can be performed by rotational movement of the upper support plate including the top and sides , allowing much more flexibility for integration into products and devices, and easier attachment of peripherals to the device. Reduced friction means, as well as magnetic balancing methods, must also be developed to accommodate their implementation; - Reduced magnet cost: The highly flexible architecture of the invention allows for immediate adaptation of shelf magnets. As an added benefit, the use of multiple smaller magnets on each core element can result in a greater magnetic force than one with a larger single magnet. Prototyping is now reduced to days instead of months;
[0032] Reduced manufacturing tolerances: The core elements are an integral part of the support plates. Simpler magnet shapes that do not require complex machining and field orientation substantially reduce the risk of product failure;
[0033] Stronger, more robust design: The elimination of machined resources on the magnet substantially increases the structural strength of the magnet. Incorporating magnets into a ferrous or non-ferrous support plate dramatically reduces abrasive damage caused by rotating a magnet against a steel surface or the risk of damage to the magnet due to impact or tensile forces of the mechanical connection 132 (Figure 2B - Prior technique) or, as described, by means of action 114 to 120 (Figure 2A - Prior technique);
[0034] Extreme size flexibility: The size of the magnet is no longer a primary constraint for producing very large switchable magnets. The flexible architecture of this invention allows the combination of multiple smaller magnets of different sizes and geometries to behave as a single permanent magnet as shown in Figures 9A and 9B. The reduction in the magnetic force-to-volume ratio, seen with larger magnets, is no longer a factor due to the ability to combine multiple sizes and geometries of permanent magnets to emulate a single permanent magnet with one of a higher force-to-volume ratio;
[0035] Improved stability: for many devices, a wider base is often as important as or more important than the total magnetic force. The magnetic elevation of sheets or thin metal structures is ideally spread over a large surface area with minimal magnetic penetration of the metal sheet. Current switchable magnetic designs for thin sheets or larger parts are very expensive, difficult to produce and difficult to operate. This invention allows simple actuation of many individual core elements positioned in a low-cost non-ferrous structure. The external dimensions can be many feet in diameter, extremely thin and have a variable internal diameter;
[0036] Efficient use of rare earth magnets: The architecture of the invention allows the development of lower profile devices. Being able to select the minimum necessary size of the magnet to obtain the optimal depth of field allows the production of a device with considerably less weight and the use of much less rare earth material to obtain Burst Performance equal to or better than a switchable magnet substantially more expensive traditional larger and heavier with the same occupation area. In addition, by selecting appropriate magnets with a face area greater than the height or width of the pole, the working surface area of the pole conduit can be increased proportionally without sacrificing performance, while reducing the actuation torque.
[0037] Ease of integration into products: The architecture of the invention allows the development of a combined receptacle and support plate designed for specific applications. Using the basic support plate configuration as a model, a new support plate configuration can be designed, which incorporates assembly features, ergonomic or stylized shapes and leverage or other performance improvements. Brief Summary of the Invention
[0038] This invention relates to an RSM device. Specifically, the invention relates to a magnetic clamping device comprised of adjacent support plates. Each support plate contains an even number of core elements (two or more) located in geometrically similar positions as on the adjacent support plate. Each core element is comprised of one or more permanent magnets with opposite north (N) and south (S) poles. Magnets can vary in shape; for example, they can be shaped like a bar, disk, trapezoid, cube, sphere, semisphere or cylinder. Each core element has pole conduit work surfaces perpendicular to the magnetic pole separation line of the magnet or permanent magnets, so that both the north and south pole of the magnet or permanent magnets have their respective magnetic fields directed through the conduits. pole for the top and bottom surfaces of each support plate. The pole ducts are comprised of a soft ferrous material magnetically, magnetically matched to contain the field of the magnet or adjacent magnets, positioned on the face of each magnet or magnet pole and isolated from the opposite pole. The size and shape of the duct is based on the relative strength and shape of the magnet or permanent magnets used.
[0039] The RSM design provides a unique highly flexible construction that allows a variety of switchable magnets ranging from extremely compact to extremely large, while offering a performance ratio for exceptional weight, highly flexible architecture, cost reduced, simplified and fast to production, improved safety, robust design, and simple rotary actuation. Brief Description of Drawings
[0040] Figure 9A is an oblique view of a core element comprising a non-ferrous support and cylindrical pole ducts for use with non-ferrous support plates.
[0041] Figure 9B is an exploded oblique view of the modality represented in Figure 9 A.
[0042] Figure 9C is an oblique view of a core element, which comprises a non-ferrous support and rectangular-shaped pole conduits for use with non-ferrous support plates.
[0043] Figure 9D is an exploded oblique view of the modality shown in Figure 9C.
[0044] Figure 9E is an oblique view of a core element, which comprises a permanent bar-shaped magnet and two elliptical-shaped pole conduits for use with non-ferrous support plates.
[0045] Figure 9F is an oblique view of a core element, which comprises permanent bar-shaped magnets and two cylindrical pole semiconductors for use with non-ferrous support plates.
[0046] Figure 9G is an oblique view of a single-core element, comprising a permanent magnet in the form of a diametrically polarized disc, and a single-piece receptacle, known as a "Double D" shape that functions as two conduits separate pole, for use with non-ferrous support plates.
[0047] Figure 9H is an oblique view of a single core element comprising a permanent magnet in the form of a diametrically polarized disk and two pole-shaped pole conduits for use with non-ferrous support plates.
[0048] Figure 10 is an oblique view of a non-ferrous support plate assembly, comprising a non-ferrous support plate that contains eight core elements of the configuration shown in Figure 9F oriented with similar pole conduits facing each other. other.
[0049] Figure 11 is an oblique view of a non-ferrous support plate assembly comprising a non-ferrous support plate that contains eight core elements of the configuration shown in Figure 9G oriented with their permanent magnet field lines perpendicular to the center of the support plate.
[0050] Figure 12 is an oblique view of a non-ferrous support plate assembly comprising a non-ferrous support plate containing 12 core elements of the configuration shown in Figure 9G with each core element rotated approximately 60 ° from its center with respect to an adjacent core element.
[0051] Figure 13 is an oblique view of a non-ferrous support plate assembly comprising a non-ferrous support plate containing 18 core elements of the configuration shown in Figure 9G oriented so that the pole ducts alternate their orientations every three adjacent core elements.
[0052] Figure 14 is an oblique view of a ferrous support plate assembly comprising a ferrous support plate geometrically similar to the non-ferrous support plate shown in Figure 10 except that the eight core elements shown in Figure 10 are repositioned by eight permanent magnets and the two pole ducts of each core element are an integral part of the ferrous support plate, shared between the similar pole ducts of adjacent permanent magnets.
[0053] Figure 15 is an oblique view of a ferrous support plate assembly comprising a ferrous support plate with eight core elements, where each core element has two permanent disk-shaped magnets of different diametrically polarized diameters aligned along the permanent magnet field line and two pole ducts that are an integral part of the ferrous support plate shared between the similar pole ducts of adjacent permanent magnets with the support plate having an outer diameter and equivalent smaller inner diameter than the support plate shown in Figure 14.
[0054] Figure 16 is an oblique view of a ferrous support plate assembly comprising a ferrous support plate containing 14 core elements, each core element having a diametrically polarized cylindrical permanent magnet and two pole conduits which are an integral part of the ferrous support plate shared between similar pole conduits of permanent adjacent magnets.
[0055] Figure 17 is an oblique view of a ferrous support plate assembly comprising a ferrous support plate containing 14 core elements, where each core element has a permanent bar-shaped magnet and two conduits. pole which are an integral part of the ferrous support plate shared between similar pole conduits of permanent adjacent magnets.
[0056] Figure 18 is an exploded oblique view of a ferrous support plate assembly comprising a ferrous support plate containing eight core elements, each core element having multiple permanent bar-shaped magnets of different sizes and two pole ducts that are an integral part of the ferrous support plate shared between the similar pole ducts of multiple adjacent permanent bar-shaped magnets of different sizes.
[0057] Figure 19 is an oblique view of one (separated in the figure for clarity) pair of stacked non-ferrous support plate sets, any of which is shown in Figure 10.
[0058] Figure 20A is an oblique view of one (separated in the figure for clarity) pair of stacked non-ferrous support plate sets, any of which is shown in Figure 12, shown with the core elements aligned out of phase and magnetic fields deactivated.
[0059] Figure 20B is an oblique view of one (separated in the figure for clarity) pair of stacked non-ferrous support plate assemblies as shown in Figure 20A, shown with the core elements aligned partially out of phase and the magnetic fields partially disabled.
[0060] Figure 20C is an oblique view of one (separated in the figure for clarity) pair of stacked non-ferrous support plate sets as shown in Figure 20A and B, shown with the core elements partially aligned in phase and the fields partially activated magnets.
[0061] Figure 20D is an oblique view of one (separated in the figure for clarity) pair of stacked non-ferrous support plate assemblies as shown in Figures 20A to C, shown with the core elements aligned in phase and the magnetic fields activated.
[0062] Figure 21A is an oblique view of one (separated in the figure for clarity) pair of stacked non-ferrous support plate sets, any of which is shown in Figure 13, shown with the core elements aligned out of phase and magnetic fields deactivated.
[0063] Figure 21B is an oblique view of (separated in the figure for clarity) pair of stacked non-ferrous support plates as shown in Figure 21 A, shown with one third of the core elements aligned out of phase, two thirds of the elements core aligned in phase, and the magnetic fields partially deactivated.
[0064] Figure 21C is an oblique view of (separated in the figure for clarity) pair of stacked non-ferrous support plate assemblies as shown in Figures 21A and B, shown with two thirds of core elements aligned in phase, one third of the core elements aligned out of phase, and the partially activated magnetic fields.
[0065] Figure 21D is an oblique view of (separated in the figure for clarity) pair of stacked non-ferrous support plate sets as shown in Figure 21A to C, shown with all the core elements aligned in phase and the magnetic fields activated.
[0066] Figure 22A is an oblique view of a pair of support plate sets of different stacked configurations, each of which is individually represented by Figures 16 and 17.
[0067] Figure 22B is an exploded oblique view of the embodiment shown in Figure 22A with friction reduction means.
[0068] Figure 23A is an oblique view of an apparatus comprised of an external receptacle, two sets of non-ferrous support plate, retaining means, and friction reducing means.
[0069] Figure 23B is an exploded oblique view of the modality described in Figure 23 A.
[0070] Figure 24 is an oblique view of an apparatus comprised of a receptacle, two sets of support plate, and automated actuating means.
[0071] Figure 25 is an image that represents the magnetic field lines of a permanent magnet.
[0072] Figure 26 is a partially exploded oblique view of stacked ferrous support plate sets (separated in the figure for clarity) with an integrated support plate receptacle assembly that integrates a support plate assembly fixed to it and comprises a different shape than that of the rotating support plate assembly. The integrated support plate receptacle assembly serves as a combined support plate and receptacle assembly.
[0073] Figure 27 is a partially exploded oblique view of a single layer matrix of non-ferrous support plate assemblies featuring an integrated non-ferrous support plate receptacle assembly that integrates two support plate assemblies attached to it and further comprises a shape different from that of two corresponding rotating support plate sets. The integrated non-ferrous support plate receptacle assembly serves as a combined receptacle for an array of multiple rotating support plate assemblies.
[0074] Figure 28 is a partially exploded oblique view of a single layer matrix of ferrous support plate assemblies showing an upper part of the layer comprised of a rotating plate receptacle with multiple rotating support plate assemblies inserted into it and a lower portion of the layer comprised of an integrated ferrous support plate receptacle assembly. The integrated ferrous support plate receptacle assembly integrates multiple support plate assemblies into it.
[0075] Figure 29 is a partially exploded oblique view of a dual layer matrix of ferrous support plate assemblies, each layer comprised of a matrix of layers of ferrous support plate assemblies, each of said matrices of ferrous support layers of ferrous support plate assemblies comprised of a layer of integrated ferrous support plate receptacle layer and a layer of rotating support plate assemblies. Detailed Description of the Invention
[0076] RSM has several preferential modalities as described in this document. However, invariably the steps to make the different modalities of the invention are the same. The steps to make the different modalities include: design and operational considerations; selection of size and shape of permanent magnet; determination of means of reducing friction; correspondence of pole conduits; design of the core elements; determining the support plate configuration; and receptacle configurations. Design and Operational Considerations
[0077] The highly flexible architecture of the invention allows quick configuration of the device to be optimally adapted to the application or design of the final product. Combining the desired clamping force, clamping position and displaced load (moment) with the typical properties of the desired target will help to select the appropriate elements required in the RSM to achieve those goals. Target specifications such as material, thickness, composition, finish, hardness, size and weight need to be identified in advance. Permanent Magnet Size and Shape Selection
[0078] Initially, the selection of permanent magnet size and shape should be based on published specifications for a particular permanent magnet strength and degree. However, the orientation of the magnetic field line and the configuration of the core element can have a dramatic effect on the performance of the core element. As an example, calculations and or traditional specifications using two identical magnets in size (1.27 cm (0.5 inch) high x 1.27 cm (0.5 inch) deep x 2.54 cm (1 inch) in length) would indicate that a magnetized magnet across the length of 2.54 cm (1 inch) (N42 = 22.7 kg (50lb)) has considerably better clamping force against a steel plate than a magnetized magnet across height of 1.27 cm (16.8 kg). This is reasonably accurate if it is desired to use only the bare magnet without pole conduits.
[0079] However, since the magnetic field is being directed through pole ducts, performance is often better using a magnet that is magnetized across the height (1.27 cm). Since the surface area of the pole conduit is based directly on the surface area of the permanent magnet pole face, the pole conduit area of the magnetized magnet over 2.54 cm in length would be based on 1.56 cm square of the pole pole face area (1.27 cm high x 1.27 cm deep). The pole conduit area of the magnetized magnet along the 1.27 cm height would have a magnet pole face of 3.12 square centimeters (1.27 cm deep x 2.54 cm long). In this case, the theoretically weaker magnet works equally or better than the similarly sized magnet with the smaller pole conduit surface area.
[0080] Since permanent magnets are considerably more expensive than steel, the general preference is to use magnets that are magnetized along the thin axis, in this case the height of 1.27 cm and not the length of 2.5 cm. This provides comparable or better performance while using less magnet material. The Lm or length of the magnet is defined as the distance from the south pole to the north pole, and should not be confused with the length of the magnet (longest dimension). Air clearance is defined as the distance that separates the RSM work surface from the target. The magnetic length Lm of the permanent magnets should be based on the desired air gap performance. Items such as paint, deposition and or other finishes act as a physical separation between the RSM and the target. An air gap of 0.025 cm can reduce the breaking force from less than 10% to as much as 75%. A higher Lm can substantially increase the air gap performance. The use of magnets of greater length (Lm) with the same surface area typically increases the air gap performance, which can be useful when trying to lift painted, plated, or rough and irregular targets.
[0081] The magnetic depth of field is related to the average distance between opposite pole ducts. It may be advantageous to replace multiple smaller magnets with the same magnetic length and approximately the same volume. This often produces superior performance than that of a single large magnet. Since the strength of a magnet is often specified in terms of infinitely thick targets, the particular magnets must be tested to the desired target thickness for performance verification before selection.
[0082] Although the preferred modality primarily uses neodymium magnets due to price and performance, most magnet compositions can be used as long as they do not demagnetize (lose their magnetisms) when subjected to an equal or slightly stronger magnetic field of the opposite polarity. This is known as coercivity. Other considerations involve temperature classification of the magnets or the point at which they start to demagnetize if taken above that temperature, that is, the Curie point. For basic neodymium magnets, it is important that the storage temperature remains below 310 ° C and avoid use at temperatures above 80 ° C as the magnetic force will degrade firmly above that point. As long as the magnet has not been subjected to temperatures above the Curie point, the magnets must return to normal when cooled. Matching Pole Conduits
[0083] There are two primary functions for pole ducts. The first is to contain the out-of-phase (N-S / S-N) magnetic field alignment of two or more desired magnets so that no magnetic flux emanates from the contact surface area of the pole conduit, in order to deactivate the device. The second function of the pole conduit is to redirect the pole conduit fields aligned in phase combined of two or more magnets, activating the device. Pole ducts are ideally constructed of a magnetically soft material such as mild steel or solenoid steel. Ideally, the south pole conduit 201a and north pole conduit 201b have to come into contact with each of the pole faces of the magnets as shown in Figure 9A. Means must be used to insulate the north and south pole ducts to provide adequate separation between opposite poles. Figure 9H identifies an isolation medium by having a north pole duct 252b separated from the south pole duct 252a by gap 253. Gap 253 must be large enough that the magnetic fields contained within the north and south pole ducts 252b and 252a respectively, do not magnetically couple so that essentially all magnetic fields emanating from the north or south pole conduits are available for redirection in a pole conduit or the adjacent target. The optimal separation distance or gap can be approximated as equal to Lm. The surface area of the contact interface between the south pole face of the magnet 203a and the south pole face of the adjacent conduit magnet 204a must be at least 25% of the surface area of the south pole face of the magnet 203a, represented in Figure 9B. The second dimensional requirement for the pole conduit is that the south pole conduit surface area 205a or the north pole conduit surface area 205b that comes in contact with either the target or an adjacent pole conduit on a support plate adjacent area is ideally 75% of the surface area of the south pole face of magnet 203a as shown in Figure 9B. This ratio of the flue pole pole face area to the pole pole face area is hereinafter referred to as the "Flue Pole Surface Ratio". Exceeding the Pole Surface Ratio of the Conduit is done at the expense of performance and excessive weight of the device. Using a smaller Flue Pole Surface Ratio often results in a device that cannot completely shut down.
[0084] When using cylindrical or disc-shaped magnets that are diametrically polarized, as a rule of thumb the pole duct surface area is best estimated as the pole surface area of a rectangular or square bar that completely contains the cylindrical or disk-shaped magnets with a similarly located magnetic field line.
[0085] It should be noted that the pole ducts do not need to cover the entire surface area of the magnet pole surfaces. The pole ducts can also extend past the width of the magnetic pole face by as much as 200% or more.
[0086] The remaining criterion for the pole conduit is the shape. Ideally, the shape of the pole conduit is such that it conducts the field of the magnet as efficiently as possible. Consequently, pole ducts must not be hollow or contain soft non-magnetic obstructions such as holes or stainless steel screws. Care must be taken to ensure smooth field flow through the pole conduit in order to obtain maximum field conduction efficiency. It is best to avoid reversing directions, or sharp corners and curves. Semicircular or elliptical shapes that follow the natural field flow of the magnet are ideal.
[0087] A pole duct is considered matched when the duct is dimensioned so that a pole duct aligned out of phase negates the field for which the magnetic tightening is insignificant. The typical criterion is to have a Pole Surface Ratio of approximately 0.75. Although this is a good starting point, this Ratio is dependent on several variables such as degree of magnet, composition of the pole duct, plating, quality of machining, and other variables. Less than optimal ratios will result in less than complete deactivation of the device when the upper and lower pole ducts are aligned "out of phase", ie, north-south (N-S) / south-north (S-N). Pole Surface Ratio of Conduit Ratios greater than optimal will not work at maximum potential when aligned "in phase", that is, north-north (N-N) / south-south (S-S).
[0088] An additional consideration when configuring pole ducts, is that the distance between opposite pole ducts, particularly with a shared pole duct configuration, also affects the depth of magnetic field. This can be used to help minimize the penetration of the field through the target. When using thick materials, saturation of the target is unlikely to happen; the magnetic length Lm or height of the magnet can be substantially greater within the geometric constraints of the pole surface area. When target saturation is not possible, the use of higher Lm magnets and greater separation between opposite pole ducts substantially improves air gap performance, creating a safer lift.
[0089] Therefore the adjacent pole ducts have long been described as separate components; however, adjacent pole conduits can be combined into a single pole conduit between permanent adjacent magnets that have similar poles, in which case they are "shared". In the case of "shared" pole conduit matching, each permanent magnet is inserted into a ferrous plate and shares the adjacent pole conduit with an adjacent permanent magnet that has the same magnetic field polarity. "Shared" pole conduit matching is similar to individual pole conduit matching; however, it should be noted that there are now two magnetic pole surfaces in each pole conduit. In a typical core element, there are one or more permanent magnets with a pole conduit attached to the north pole face and the south pole face of the magnet. In the configuration shown in Figure 14, the permanent magnets 342 and 343 have a shared south pole duct 345a in contact with the south poles of each of the permanent magnets 342 and 343. The permanent magnets 343 and 344 similarly have a duct. shared north pole 345b in contact with the north poles of each permanent magnet. In this configuration, each of the "shared" pole conduits is in contact with two of the north poles of the permanent magnets or two of the south poles of the permanent magnets. This configuration produces essentially the same result that would be obtained if the non-ferrous part of the support plate was eliminated between the north pole ducts 302b and 305b and the adjacent north pole ducts 302b and 305b were combined in a single pole duct with an area surface equal to the area of the combined north pole ducts 302b and 305b as shown in Figure 10. Using pole ducts that are shared between adjacent permanent magnets instead of in direct contact with each other, an increase in efficiency or ability to contain and redirect the magnetic fields of adjacent permanent magnets. This efficiency or synergy is a result of the combination of permanent magnet magnetic fields located in different positions (left and right side of the shared pole conduit) as well as due to the "closed" nature of the magnetic field, that is, the magnets and conduits of pole form a magnetically contiguous circle. Experiments have shown that the optimal pole conduit surface area is around 0.70 to 0.75 times the magnet pole surface areas combined on opposite sides of the pole conduit (or a north magnetic pole surface north (NN) or south-south (SS)). As with individual pole conduits on non-ferrous plates, verification of pole conduit matching is a must; by aligning the upper pole ducts and their respective out-of-phase magnets with the lower pole duct and their respective magnets, little to no pinching or magnetic field is present on the work pole duct surface.
[0090] As described in more detail under the heading Friction Reduction Means, an air gap is introduced when implementing a friction reduction means. This air gap prevents the device from deactivating completely due to the degraded coupling of the fields contained in the pole ducts. Essentially, not as much of the magnetic field contained in the pole ducts is available to neutralize the magnetic field in the lower pole ducts. A simple solution is to increase the magnetic field contained in the upper pole ducts so that the magnetic field that reaches the lower pole ducts is sufficient to completely neutralize the field contained in the lower pole duct.
[0091] Several methods for increasing the magnetic field of the upper pole ducts, for example, and not by way of limitation, include: - Use of higher grade magnets (eudimium magnets, readily available from Grade N35 up to more than that 52); - Increase the volume of the magnet using any of: - A larger quantity of magnets; - Larger permanent magnets; or - Magnets differently; or - The use of metals with greater permeability.
[0092] Using one or more of these methods allows complete neutralization or, if desired, a slight inversion of the magnetic pole conduit field that emanates from the pole conduit that comes into contact with the work surface or target. However, there will be a slight residual magnetic field emanating from the core element not in contact with the work surface or target. Isolation of this residual magnetic field when deactivated can be achieved by a variety of methods, including without limitation, masking or encapsulating the exterior of the upper support plate assembly 432 of Figure 22B with a non-magnetic material of sufficient thickness, adding a material ferrous material around a thinner non-magnetic enclosure, or simply ignore the residual magnetic field since it is a relatively weak residual force. There are cases when a moderate force of attraction is desirable when the device is deactivated; for example, maintaining a small pull force to prevent a disabled unit from falling, or providing a small amount of lift or pull until the device is properly positioned at the point at which the device is fully activated. If a small residual force is desired when the unit is deactivated, core elements of equal strength can be used in the upper and lower support plates; however, it should be noted that these devices will slowly accumulate ferrous residue over time, and therefore should either be kept in contact with a ferrous target, encapsulated as described previously, or cleaned at times.
[0093] It may also be desirable to momentarily reverse the polarity of the lower magnet in a pair of upper / lower magnets in an effort to "push" or demagnetize a ferromagnetic target that is not entirely magnetically soft. Hardened or tempered target materials typically have residual magnetism once the magnetic field is removed. By reversing the polarity of the lower magnet assembly through the use of a substantially stronger upper magnet assembly, some or most of the residual magnetism in a target can be removed. When the upper and lower sets of a support plate are in phase, there is a strong force of attraction to the target. When the upper and lower assemblies of a support plate are aligned out of phase, the upper assembly fully covers the lower assembly resulting in an inverted liquid field flow in the target that demagnetizes the target and allows easy release. Having a stronger magnet assembly on the upper plate, the OFF or disabled position can be at a slight angular displacement of 0 ° (1 ° or 2 °) so that the magnetic flux from the upper magnet assembly cancels the magnetic field of the plate lower support plate (and also overcome any loss of air gap). The complete phase alignment of the upper and lower support plates at 0 ° could result in a slight reversal of the magnetic polarity of the core elements in the lower support plate. Designing the Core Elements
[0094] As previously described, a core element is a pair of magnetically matched pole ducts with one or more permanent magnets inserted between the pole ducts. The magnetic field line of the permanent magnet (s) is oriented with the north (N) and south (S) magnetic pole faces in contact with the vertical sides of the pole conduits.
[0095] There are three basic types of core elements: - The first basic type of core element is for use on a non-ferrous support plate comprised of one or more permanent magnets sandwiched between two pole conduits as shown in Figures 9A, 9B, 9C, 9D, 9E, 9F, 9H, and 10. This first type of core element is represented with multiple support plate sets in Figure 19. The fixing means for fixing the permanent magnets to the pole ducts are varied and may include, without limitation, adhesive bonding, potting, recesses for incorporation into the pole conduits to capture the encapsulation of the permanent magnet (s), molding of the entire assembly on a non-ferrous support plate, or any combination thereof . One of the advantages of this style of pole duct is that the material costs are relatively cheap, ideal for limited production; - The second basic type of core element is for use on a non-ferrous support plate comprised of a single piece pole pair conduit receptacle as shown in Figures 9G and 11 to 13 which has one or more permanent magnets attached to the receptacle. This second basic type of core element is represented with multiple support plate sets in Figure 20A to D, 21A to D, and 23A and B. Regardless of the shape of the pole conduit receptacle, the receptacle style must be designed to that a minimum amount of ferrous material be kept along the magnetic field separation line to avoid or reduce a short circuit of the north and south poles of the permanent magnet (s). Methods to reduce this short circuit include, without limitation, having thin side walls, drilling or cutting most of the material along the lines of the magnetic field, inserting a non-ferrous material between the poles (welded, cast or glued) before machining, or any combination of them. As with the first basic type of core element, this type of core element is designed for use with non-ferrous support plates using similar clamping methods. The advantages of this type of core element include providing the capacity for mass production a few sizes of core elements that can be inserted in many different plate sizes, and fast production with very predictable performance; e - The third basic type of core element for use on a ferrous support plate uses shared pole conduits and is comprised of the exemplary core elements shown in Figures 14, 15, 16, 17, and 18. This third basic type of Core element is represented with multiple support plate sets in 22A and B, 24 and 26. In these designs, each core element permanent magnet or magnets are inserted directly into a corresponding cavity in a one-piece support plate. The cavities in each support plate accommodate the core elements in each plate. This design may have a performance ratio for exceptional weight. In addition, the support structure plate is quite strong since the support plate is made from a single piece of magnetically soft steel. This has the deepest field penetration using the same magnets and is generally the most cost effective to produce since only the cavities and not the individual pole ducts have to be machined. The support plate can be produced with very strict tolerances, substantially reducing any potential misalignment between the support plates and maintaining a contiguous upper and lower surface to minimize any interference between the plates during the activation or deactivation of the device. By integrating the pole ducts in the support plate, the number of assembly parts and manufacturing costs are reduced substantially.
[0096] The support plates shown in Figures 10, 11, 12, and 13 are made of aluminum, but can be made of plastics, ceramics, epoxies, brass, non-magnetic stainless steels, or other appropriate materials. The manufacturing process can be readily adapted so that a support plate can be injection molded or machined to contain or allow the set of magnets to be embedded. Care must be taken not to exceed Curie's point. As a magnet assembly does not move with respect to the pole ducts, it can be coated, filled, or completely sealed with epoxy. Efforts should be made to minimize air gaps between the support plates, and between the support plates and the target material since the magnetic force is inversely proportional to the square of the air gap.
[0097] Another consideration when designing the core element is that the magnetic fields are unable to make sharp turns. To maximize performance, the pole ducts must have a curved, somewhat elliptical shape, which ideally corresponds to the magnetic field lines as shown in Figure 25 based on peak strength emanating from the center of the pole duct face which decreases when approaches the magnetic field line so that there is an hourglass shape with most of the narrow point in the field line. Iron fluid mapping can also be used to provide a visual of the ideal pole conduit profile. This somewhat elliptical shape on each pole face can be difficult to machine, so circular shapes or "Double D" shapes (shown in Figure 9G) are often used as a great approximation with good results. Projects must ensure adequate separation between the north and south poles of the permanent magnet (s). Increasing the number of core elements in a support plate will also determine the relative rotation angle to activate and deactivate the device. Determining the Support Plate Configuration
[0098] Regardless of the composition of the support plate, ferrous or non-ferrous, there are other factors that key influence the configuration of the support plate such as desired actuation angle, weight, cost, actuation method, actuation torque, positional retainers, plating, and receptacle configuration, target size, desired footprint, and safe elevations. Desired Operating Angle
[0099] The actuation angle as described in this document refers to the relative rotation of a support plate with respect to an adjacent support plate. There are two or more core elements on each support plate that are geometrically positioned and equally separated within the support plate. The relative rotation required between adjacent support plates to actuate or untie the device, that is, the actuation angle, is dependent on the number of adjacent core elements in each plate. The actuation angle is essentially 360 ° divided by the number of opposing core elements on the plate. For example, a support plate with five adjacent core elements spaced apart should also have a 360 ° / 5 or 72 ° actuation angle. Here, a 72 ° rotation of a support plate with respect to an adjacent fixed support plate results in complete activation or deactivation of the magnetic fields, depending on the starting point. Likewise, a plate with 18 adjacent core elements spaced apart should also have an angle of actuation of 360 ° / 18 or 20 °. Here, a 20 ° rotation of a support plate with respect to an adjacent fixed support plate results in complete actuation or de-inactivation, depending on the starting point. The core elements are positioned on the support plates so that if a first support plate is positioned adjacent to a second support plate and rotated with respect to the adjacent adjacent support plate by the actuation angle, the element (s) ) of core on the first support plate should have a magnetic pole orientation opposite with the core element (s) on the second support plate; that is, N-S / S-N. this disables the magnetic fields emanating from the device. By rotating the first support plate again by the actuation angle, the core element (s) on the support plate must have the same magnetic pole orientation as the core element on the second support plate, ie , NN / S- S. This activates or activates the device.
[00100] First and second support plates in a support plate set must have a corresponding magnetic pole orientation with respect to each other, but the support plates need not have the same shape. For example, a second support plate can have a square shape or other functional shape, while the first support plate can remain round. This is beneficial in that the support plate can be specifically optimized for a particular use, and a relative rotation of the core elements in the upper support plate must activate the core elements in the second support plate in a functional way.
[00101] Figure 26 describes a configuration for use with a magnetic drill base. This design allows most of the magnetic clamping force to be located at one end and adds length to the assembly for improved loading moment. The material is strategically removed to minimize the weight of the product and to maintain the appropriate Pole Surface Ratio of the Flue.
[00102] Reference anywhere in this document to a first support plate and second support plate should be considered as being synonymous with the reference to an upper and lower support plate. Reference to an upper and lower support plate is not intended, nor should it be construed as limiting the relative positions of adjacent support plates; the essence of this is that the support plates are adjacent to each other, regardless of their orientation in space.
[00103] It is important to note that multi-core element configurations may have core element configurations that change the actuation angle. These unique configurations provide two or more increases in strength within the actuation angle. As an example, a plate of 18 core elements with the core elements changing the direction of the magnetic pole every two core elements, should have an effective actuation angle of 360 ° / 18 x 2 or every 40 °; likewise, if the pole direction of the core elements changes every three adjacent core elements as shown in Figures 21A, 21B, 21C and 21D, this configuration must have an effective actuation angle of 360 ° / 18 x 3 or 60 °. Starting from a fully unfastened position, rotate the support plate of Figures 21A to D in increments of 20 ° (360 ° / 18) with core elements that change direction every 60 °, one third of the core elements must act at 20 °, two thirds of the core elements must act at 40 ° and all core elements must act at 60 °.
[00104] There are other variations where the core elements are rotated by a fixed angle between the adjacent core elements in a repetitive pattern. An example would be a plate of 18 core elements with a repetitive pattern where the first core element is oriented radially north-south; the second adjacent core element is rotated by 60 °, and the third adjacent core element is rotated by 120 °. in this example as shown in Figures 20A to D, the effective actuation angle is also 360 ° / 18 x 3 or 60 °; however, a rotation of 20 ° should result in partial activation of the core elements as shown in 20B, a rotation of 40 ° should result in an additional increase in activation as shown in 20C and a rotation of 60 ° should fully activate all elements. of core as shown in 20D. Although this force is not directly proportional to the angle of rotation, it can be defined so that a variable magnetic force can be achieved by partially rotating one support plate with respect to the other and having retainers or locking positions to maintain the position of the plate support at the desired magnetic field level. Achieving this variable magnetic force can be useful when it is undesirable to have a strong residual field of the magnet emanating through a thinner target, to optimize the magnetic field based on material thicknesses, or to test elevation to ensure proper breaking performance as well how to reduce actuation torque requirements based on material saturation. Weight
[00105] Switchable multi-core architecture allows non-ferrous plates that use separate core elements (not the "shared" or ferrous core element plate) to be constructed from a wide range of materials. Although the composition of the core element is predetermined, the composition of the support plate on which the core elements are positioned is restricted only by cost and desired mechanical properties such as hardness, density, friction coefficient, etc. The support plates can be configured from wood, plastic, ceramics, non-ferrous metals, etc. The material must be able to manipulate the force positioned on the substrate of the support plate by the core elements. Cost
[00106] The switchable multi-core element is the least cost switchable matrix magnet for available performance. However, using exotic materials for additional performance gains can quickly increase the price. High operating temperature requirements can also increase the cost of neodymium magnets. Maximizing the clamping force in a small enclosure should require higher degrees of neodymium. Although pole ducts that are capable of being made of low carbon steels such as 1008 to 1018 are relatively inexpensive, high permeability steel alloys are available for maximum performance that allow much higher saturation flux density levels (magnetic clamping) to the target). Most of these improvements offer moderate gains with a substantial cost increase. Improving the corrosion resistance of a core element is important. The use of magnetic stainless steels or high permeability stainless steels can also be expensive, although a viable option. Unless otherwise required, plating is usually acceptable for most commercial applications for corrosion resistance. It is important to note that the use of high permeability alloys will require modification of the optimum Conduit Pole Surface Ratio and performance should be verified as described in the Pole Conduit Matching section. Friction reduction means
[00107] When aligned out of phase, the magnetic clamping between the upper and lower pole conduits is essentially equivalent to the total magnetic clamping available to the target when the device is aligned in phase. Shear force is the force that would be needed to slide one object over the other. The shear force of a steel pole conduit in direct contact with another pole conduit is approximately 25% of the breaking force. The bursting force is defined as the force required to separate a magnet from a target by pulling the magnet in a perpendicular direction away from and away from the target. If a pair of north and south pole conduits has a breaking force of 109 kg, the effort to slide one pole conduit with respect to the other can easily require 27 kg of force. A device of four pairs of conduit, which is relatively small, may require as much as 109 kg of rotational force to overcome the shear force due to the attraction between the support plates when disabled. Attempting to actuate this unit from the deactivated position using a typical 23 cm crescent wrench should require 244 N-m of torque. A friction-reducing means has to be incorporated to make the apparatus usable. There are many techniques that can substantially minimize this force; however, most will introduce a small air gap between the pole ducts. This gap is likely to prevent the device from properly deactivating, even when minimized. Detailed methods for solving these problems are identified in the section entitled Correspondence of Pole Conduits. To address this problem, there must be a variation in the strength of the magnetic field between the upper and lower core elements, so that when deactivated there is tightness or minimal magnetic field present on the work pole duct surface (if desired). This can be done, for example, and not by way of limitation, through the use of ball bearings and roller bearings, air gaps, exotic or high-performance lubricants, low-friction finishes or coatings, discs or poly rings -tetrafluoroethylene (PTFE), or other materials suitable for the desired number of life cycles and compressive strength. The thickness of the selected material should introduce a small air gap that should require an increase in the field strength of the upper core permanent magnet elements as previously described. However, the required actuation torque is not only reduced by the high-performance friction reducer, but also by the addition of an air gap. The attraction between upper and lower core elements decreases dramatically due to the air gap. For example, a 0.5mm thick Teflon® disc can reduce the attraction force between upper and lower core elements to 50% of the attraction force if an air gap is not present. Combined with reduced friction coefficient, the unit can now be easily activated manually or with an attached lever. The compressive strength of Teflon® is approximately 28 kgf / cm2 although it has poor tensile strength. However, the cost of Teflon is relatively cheap and since the attractive forces between the upper and lower support plates are low enough not to damage the Teflon material, it is less expensive than ball or needle bearings as a means friction reduction. Means of Operation
[00108] The RSM device lends itself to many different operating methods. Since an external receptacle is not required to hold the plates, features can be incorporated to allow the device to act on the top as shown in Figure 24 or on the sides as shown in Figures 23A and 23B. In addition, since there is often a hole or opening in the center of the modality shown in Figure 23A, the actuation can be obtained through a hole in the target material, for applications such as a door lock. As with any manually actuated device, provision can be made for a myriad of actuation methods. Automated switching methods include mechanical, electromechanical, electrical and magnet-motor actuation, among others. Mechanical performance includes, without limitation, pneumatic, hydraulic, by gear, by transmission belt, lever, spring, button and manual. Examples of electromechanical actuation include, without limitation, motors (reducer, servo, stepper), solenoids and rotary solenoids. Examples of electrical actuation include, without limitation, magnetic coils oriented so that the magnetic fields are aligned with the magnetic fields in such a way that the electromagnetic field can completely negate or invert the generated permanent magnet field when energized. Reversing the polarity of the electromagnetic field can substantially increase the magnetic grip and depth of field while energized. Magnet-motive performance includes, without limitation, the use of a magnetic field that can provide a rotational force effort on the plate, similar to a spring. Actuation Torque
[00109] As with all switchable magnets and phase cancellation matrices, the actuation force is usually ten times greater on a non-ferrous surface than on a ferrous target that does not fully saturate. The N-N or S-S alignment of the magnets in the pair of upper and lower core elements without a target for the magnetic field produces a repulsive force between the two support plates. This repulsive force between the two support plates decreases when an activated switchable magnet device comes into contact with a target. When the thickness of the target increases, the force required to act on the magnetic field drops considerably. A modality that allows a lower actuation force is to allow a first support plate to separate from an adjacent support plate while the appliance is operating. An increased air gap will reduce the actuation force by reducing supersaturation of the target material. Target materials that are relatively thin compared to the core elements will exhibit a greater repulsion force than the attraction between the core elements. The level of actuation torque as described above is directly proportional to the saturation of the target material. If the RSM is not positioned on a ferrous target, the actuation torque will be substantially greater than when positioned on a ferrous target. This variation in the actuation torque is beneficial because it is difficult to operate the RSM unless it is positioned on a target, that is, the more difficult it is for the operator to operate the device, the weaker the breaking force. This can provide the device user with valuable feedback on the extent to which the device is attracted to the target. The forced action of the RSM while not attached to a target allows the pole ducts to emit their magnetic fields over a considerable distance. While health risks are thought to be very low with exposure to magnetic fields, the risk of pinching a body part between an already activated unit and a nearby steel surface is not. Positional Retention Means
[00110] Provisions for limiting the angle of rotation can be incorporated in the upper and lower support plates as shown in Figures 23A and 23B. Spherical retainers or rotational stops can be incorporated to prevent unintentional deactivation. In most cases, the support plates are separated with either a low-friction sliding membrane or with an appropriately sized ball or roller bearing device based on the desired life and type of use. In a configuration with an upper and lower support plate, the rotation of the upper support plate (s) in an NN / SS alignment, that is, in an activated or actuated mode (ON position) when not on a ferrous target results in a spring-like resistance against rotation. If a device is removed from a target while it is activated, the repulsive forces between the support plates will increase (the same magnetic repulsion observed when no target is present) causing the support plate (s) to rotate ( m) back to a disabled position unless held. Therefore, it is important that a retention or locking feature is included in the device if used on targets of varying thickness or if off-targeting is desirable. The examples cited in this document with respect to provisions for limiting the angle of rotation of the support plates and other examples provided throughout this disclosure are by way of example and not limitation (if this is explicitly specified with respect to the examples given) once that there are several methods not specifically mentioned that will achieve the same desired angle of rotation limitation. Retention Means
[00111] In order to facilitate the actuation and desaturation of the device, a rotational restriction has to be implemented to allow appropriate rotational alignment of the core elements in the first support plate with the corresponding core elements in the second support plate. The rotational restraint of the device is often done by attaching a second support plate relative to the target or work surface, and rotationally retaining the first support plate so that it can only rotate concentrically with respect to the second support plate. This can be done in a number of ways and the examples in this document are, by way of example and not limitation; - a central axis fixed to the second support plate and provides radial clearance and subsequent concentric rotation of the first support plate, - a central axis fixed to the upper support plate with clearance to allow the first support plate and the axis to rotate concentrically within of the lower support plate, - a cylindrical perimeter fixed or integrated in the lower support plate, allowing restricted concentric rotation of the first support plate within the cylindrical perimeter, - a receptacle that secures the second support plate and attaches to an external device that has an internal rotational axis such as, but not limited to, a motor, pneumatic cylinder or rotating solenoid, and concentrically retains the first support plate to the internal rotational axis so that the rotation of the external device axis results in a relative concentric rotation of the first support plate with respect to the second support plate which is fixed to the outside of the external device. - a receptacle that fixes one or more second support plates on a common base and has a corresponding amount of central axes that allow the corresponding amount of first support plates to rotate concentrically - a receptacle that fixes one or more second support plates in a common base and has either an integrated or separate receptacle that provides concentric rotation of the perimeter of the first corresponding support plates. Deposition and Coating Means
[00112] Various coatings and or surface plating of pole ducts or support plates can be used to improve product performance based on the intended application. Since most magnetically soft steel oxidizes easily, a coating or plating is often required to protect the device from corrosion. Several coatings have been identified in which they not only offer improved corrosion resistance, but they can also affect product performance in terms of shear strength, breaking strength, and electrical performance, among other variables. As an example, black oxide coatings provide an improvement in the ability of the magnetic field to conduct from core elements adjacent to each other and in the ability of the magnetic field to conduct to the work surface, thereby increasing the breaking strength and subsequently the shear force between the device and the work surface. Titanium nitride coatings and their variants are often used to reduce friction in cutting tools. When used in the contact area of the device's work surface, the coating can dramatically increase the device's shear strength performance; that is, the force to slide the device together with a target. Copper, silver, gold and other highly conductive plating materials can be used to improve the electrical conductivity of the device when used in electrical applications. The use of these and other coating and plating methods such as zinc plating, copper plating, nickel plating, plasma coating (by way of example and not limitation), is expected and their use is anticipated based on the desired application for the device. Encapsulation Means
[00113] The encapsulation of the exterior of the device can provide magnetic insulation from the exterior of the device to prevent inadvertent attraction of ferrous residue during use. The package can also be used to provide electrical insulation or the insulation of the product when used in areas that have exposed electrical contacts. Depending on the encapsulation method and material, corrosion resistance can also be improved. Encapsulation can be done at the support plate assembly level, at the device level, at the core element level, at the magnet level, or at around the external receptacle. Encapsulation materials include, but are not restricted to; thermoplastics, phenolics, epoxies, resins, rubber, synthetic or manufactured materials. Receptacle Settings
[00114] The receptacles are traditionally used to contain and provide structure to transport one or more support plates. Since the support plates are a one-piece construction (with core elements attached or pressed) and generally do not require a structural casing, the receptacles can be used for dramatically different purposes. The receptacles may incorporate, by way of example and not of limitation, actuation features, speed limiting features, sensors, indicators, shielding, retention, external fixation or mounting features, enlarged structure, the containment of multiple dies in the same plane or different angles, and protection of the application environment. In addition, one or more support plates can be incorporated into a receptacle incorporating final design shapes and mounting points in the receptacle. Figure 26 represents a possible configuration of an integrated support plate receptacle that serves as a combined support plate assembly and receptacle.
[00115] A single receptacle may be comprised of one or more support plates. Figure 27 represents an exemplary receptacle comprised of two support plate assemblies integrated into a single receptacle. This integrated support plate set need not be comprised of identical support plates in shape, size, or number of pole ducts. The same can be comprised of more than two support plate sets.
[00116] A first integrated support plate set comprised of multiple support plate sets in a first receptacle can be combined with multiple support plate sets that are separate or combined in their own integrated support plate sets, as shown in Figure 28. This Figure 28 illustrates a first integrated support plate set attached to a receptacle combined with a corresponding number of rotating support plate sets inserted into a receptacle. Finally, more than two layers of one or more integrated support plate assemblies can be employed in a single integrated receptacle or in more than two separate receptacles. See Figure 29.
[00117] With this invention a rotatable switchable magnetic core element can be configured to do considerably more. The following uses of receptacle integration, by way of example and not limitation, are a small fraction of the possibilities available: Welding of earth clamps, woodwork of guide boards, magnetic drills, metal clamping devices, magnetic tables, jigs , angular lathes, emergency lighting, smoke detectors, manhole lifts, magnetic locks, electric door locks and latches, shield fixation, camera brackets, dial indicator brackets and even refrigerator magnets. The receptacle may include provisions that allow the assembly of an array of two or more sets of support plate of magnetic core elements with either a common actuation point or individual actuation points.
[00118] While the above written description of the invention allows an individual of common knowledge to make and use what is presently considered to be the best mode of the same, those individuals of common knowledge will understand and evaluate the existence of variations, combinations, and equivalents of the modality, method, and specific examples in this document. All examples provided are without limitation, provided specifically or not without limitation. Therefore, the invention should not be limited by the modalities, methods, and examples described above, but by all modalities and methods within the scope and spirit of the invention. Applying the Steps Above
[00119] The steps above are now applied to the following example. Assuming that the purpose for the purposes of this example is to lift injection molding dies without having to attach hooks or attachment points. Injection molding dies weigh up to 227 kg and have a floor area of 15 cm by 40 cm wide and 40 cm high. To maintain proper orientation, matrices need to have an RSM attachment to the top surface of the matrix, which is 15 cm deep x 40 cm wide. The amplitudes of the matrices show that the cavity resources within the matrix stop approximately 1.27 cm from the top surface. This design and operational data so far, describes the target well enough to restrict the RSM design to: 1) 680 kg burst force requirement, defined by the maximum weight of 227 kg with a safety factor of 3: 1. 2) A magnetic depth of field 1.27 cm or less, and a maximum diameter of 15 cm (top surface of 15 cm x 41 cm). Assuming that RSM has a 1.27 cm depth of field penetration. 3) Support plate smaller than 15 cm in diameter.
[00120] Given the requirements above, a simple design of two support plates is suitable since only the top surface of the target has to be gripped. The support plates must be sufficiently rigid to minimize flexing. A safety factor of three times the maximum weight of the matrix is prudent. Note: Higher safety factors may be required depending on the environmental environment (overload, public use, etc.). A ferrous core element plate design is selected to maximize magnetic grip while minimizing cost. The "shared" ferrous core element plate design and concept is further described in the Pole Conduit Correspondence below.
[00121] The length of the magnet must be less than the radius of the support plate. In this case, a selection of a magnet with a length of 21.27 cm allows it to remain within the diameter of the support plate of 15 cm while allowing a central axis around which the support plates can rotate. . A pole face area of 2.54 cm x 6.35 cm = 16.13 square centimeters is now defined. This is the surface of the work pole duct or the contact area of the target. Knowing that the length of the magnet Lm is approximately equal to the depth of the magnetic field, a magnet with Lm = 1.27 cm is optimal. As this magnet size is not readily available, a combination of magnets can be selected which when combined are the equivalent size. For this example, five magnets with dimensions of 2.54 cm x 1.27 cm x 1.27 cm where Lm = 1.27 cm are suitable. The combination of multiple smaller magnets combined to form an effective single larger magnet of equivalent size, will be referred to as a "Magnet".
[00122] The number of Magnets located inside the plate as well as the angle of action can now be determined. An evaluation of a plate of four magnets with Lm = 1.27 cm (given a 6.3 cm x 2.54 cm x 1.27 cm permanent magnet) has a total permanent pole magnet surface area of 16, 1 cm2. Combining the similar adjacent poles each with an area of 16.1 cm2 for a total of 32.2 cm2 and multiplying by a factor 0.75 to obtain an optimum pole duct surface area of 24.2 cm2. The total area of a 15.2 cm dish is π D squared / 4, minus the area of the magnets 4 x 1.27 cm x 6.35 cm and minus the area of a center of rotation (approximately 3.23 cm square), produces 146.5 cm2. Dividing 146.5 cm2 by four permanent magnets produces a value of 36.8 cm2 of pole pole surface area, instead of the optimum 24.2 cm2. Therefore, a design of four magnets is not ideal.
[00123] Now a configuration of six magnets is evaluated. In order to accommodate 6 Magnets with Lm = 1.27 cm, a minimum diameter of center of rotation above 1.9 cm is required. Unfortunately this limits the length of the magnet to less than 6.35 cm. A permanent magnet of 2.54 cm x 5.08 cm x 1.27 cm (Lm = 1.27 cm) is selected. A calculation of the surface area of the permanent pole magnet indicates a total of 25.8 cm2 between similar adjacent poles. Multiplying by the optimum factor 0.75, an optimal pole duct surface area of 119.3 cm2 is required. Calculating the actual area of the dish, as described above produces approximately 21.6 cm2 of pole duct surface area. The actual factor is 0.8375, 21.6 cm2 (pole conduit area) / 25.8 cm2 (permanent pole magnet surface area). This is very close to great.
[00124] A configuration of eight permanent magnets, with Lm = 1.27 cm, requires a minimum diameter of center of rotation above 2.22 cm. This configuration limits the length of the magnet to less than 6.35 cm, so a 2.54 cm x 5.08 cm x 1.27 cm permanent magnet is selected (Lm = 1.27 cm). A calculation of the surface area of the permanent pole magnet indicates a total of 25.8 cm2 between adjacent adjacent poles. Multiplying by the optimum factor 0.75, an optimal pole conduit surface area of 19.3 cm2 is obtained. Calculating the actual area of the pole ducts, as described above, produces approximately 23.125 square centimeters, less than the ideal ratio of 0.75. The actual factor is 0.62 (23.125 cm square area of the pole duct / 25.8 cm2 magnet of permanent pole surface area). This is close to great. However, once the setting of 8 permanent magnets has fallen below the desired ratio, this setting will not completely disable.
[00125] A configuration of 6 Magnets is selected since it is relatively close to the desired ratio of 0.75. Further optimization is possible by reducing the diameter of the plate to 14.6 cm. This produces a pole duct surface area of 19.55 cm2, or a factor of approximately 0.76.
[00126] Most magnet suppliers identify the breaking performance of magnets by grade and size of the magnet. Using this data or a readily available magnet calculator, a N42 magnet with a 2.54 cm x 5.08 cm pole face and Lm = 1.27 cm is classified as 4 x 16.96 kg = 67.13 kg . Note that current magnet calculators show that a single N42 magnet with dimensions of 2.54 cm x 5.08 cm x 1.27 cm (Lm = 1.27 cm) has a tensile strength of approximately 34 kg, approximately% of the pull force of the individual. The data for a Magnet of equivalent size 1.27 cm x 2.54 cm x 5.08 cm with Lm = 2.0 shows a steel pulling force at 68 kg. Using data from the 4 individual magnets which are 1.27 cm x 1.27 cm x 2.54 cm Lm = 2.5 cm, it shows 22.7 kg of pull force per magnet or 4 x 22.7 kg = 90 , 7 kg total combined pull force.Depending on the configuration and orientation of the selected permanent magnet, a range of 34 kg to 90.7 kg pull force is expected. The best estimate for performance, using a shared pole conduit configuration, is to use the highest pull force per magnet size regardless of length Lm. This is primarily due to the influence of pole ducts in redirecting combined fields to a more effective direction.
[00127] Since there are 6 permanent magnets in each support plate and two support plates (total of 12 magnets), a breaking force of 1088 kg (12 x 90.7 kg) is expected with this method (well surplus) to the design criterion of 680.4 kg). It is important to note that with the shared RSM pole conduit configuration, the pull force is often higher than the total sum of the individual magnets (1088 kg). Performance should be checked after building the RSM.
[00128] Having calculated the RSM's performance above 1088 kg, a means of friction reduction now has to be considered. Internal forces between the upper and lower support plates are substantial and easily exceed 1360.8 kg. Having 6 shared pole ducts, each with an area of approximately 19.3 cm2, the "friction reduction means" must be able to withstand approximately 21.09 kgf / cm2 (1360.8 kg / 116.13 cm2 ). Depending on the number of anticipated activation and deactivation cycles over the expected product life, a means of friction reduction can be selected. PTFE produces a force of approximately 28.1 kgf / cm2; however, its breaking strength is considerably lower. In order to accommodate the properties of PTFE, the surface between the upper and lower support plate sets must be very smooth to avoid breaking the PTFE during rotation of the upper support plate set. It is determined that a low profile roller bearing is the most suitable for this application. A rating of 1814.4 kg is selected and integrated between the upper and lower support plate sets. This will also reduce the actuation force substantially due to the reduced friction coefficient on the PTFE layer.
[00129] A receptacle configuration, if required, must now be determined. A non-ferrous shaft of up to 2.22 cm in diameter attached to the lower support plate can be used as a primary fixing feature for a hook or other lifting device. Alternatively, a receptacle can be attached to the outer perimeter of the lower support plate. Attention has to be paid to the dish, since a substantial amount of material has been removed to accommodate the permanent magnets weakening its structure. A stress analysis has to be carried out on the lower support plate to ensure that the breaking force does not cause excessive flexing of the lower support plate. If it is known that the objects to be lifted are known not to exceed 227 kg, then the stress analysis can be performed using that number together with a desired safety factor. If the use of RSM is not limited to a specific weight, maximum breaking performance should be used to determine whether an additional support structure is needed to accommodate the anticipated breaking force. In the example above, it is determined that an external receptacle is unnecessary since a structural analysis indicates that the RMS configuration can accommodate a breaking force greater than 1227 kg (structural analysis calculation is not shown here).
[00130] Other considerations for the receptacle include items such as limiting the residual magnetic field of the upper support plate and the environment to which the RSM will be subjected. At the injection molding site, it is determined that there is very little suspended ferrous residue and that the relatively small residual magnetic field emanating from the upper support plate assembly will not have a negative impact. Detailed Description of Drawings
[00131] RSM provides modular designs that are compact and comprised of two or more support plates with two or more core elements per support plate. The arrangement of support plates, comprised of corresponding relatively thin core elements contained within each support plate, provides a switchable high magnetic flux density device (ON, OFF) with variable angle. In the ON position, the magnetic fields emanating from the device are activated so that they attract a target. In the OFF position, the magnetic fields emanating from the device are deactivated for them not attracting a target. RSM provides intermediate positions between ON and OFF in which the magnetic fields emanating from the device are partially activated or deactivated.
[00132] The modular clamping device comprises two or more geometrically similar support plates of interchangeable core elements. Figures 9A to 9G show several possible arrangements of corresponding pole conduits for permanent magnets, for example, and not by way of limitation.
[00133] Figures 9A and 9B demonstrate the highly flexible nature of the architecture of the invention. The figures represent the core element 200 comprised of magnetically soft north and north pole conduits corresponding to 201a and 201b respectively, attached to a group of permanent magnets 206 which are all of the same physical length and magnetic length Lm, contained within the non-ferrous support. optional 202. The combined south pole magnet faces of the permanent magnet group 206 are attached to the vertical face 204a of the south pole conduit 201a to thereby define the south pole conduit 201a as a "south pole conduit". Similarly, the combined North Pole Magnet Faces of the permanent magnet group 206, opposite the south pole face of magnet 203a are attached to the face of the north pole conduit magnet 204b to thereby define the north pole conduit 201b as a "north pole conduit". The surface area of the south pole 205 (hatch) of the south pole flue 201a is ideally 75% of an area of the south pole face of magnet 203 of permanent magnet groups 206 (as noted above, the Pole Surface Ratio of the Conduit). In larger applications (larger magnet over 20 mm thick), replacing a plurality of magnets with a single larger magnet, while possible, is often more expensive and not as desirable. The performance of a plurality of permanent magnets, equal to the same volume, often exceeds the performance of a larger single magnet due to the magnetization inefficiency described above. Replacing the permanent magnet group 206 with a longer magnetic length Lm as shown in Figure 9B does not change the Pole Surface Ratio of the Conduit.
[00134] As an example, assuming that all magnets represented in Figure 9B have a magnetic length Lm of 40 mm. The surface areas of conduits at the south and north poles 205a and 205b respectively, remain the same if Lm is 10 mm or 50 mm. Although the optimal Pole Surface Ratio of the Conduit is identified here as 75%, variations in the permeability of the materials used for the geometries of the pole and magnet conduits can impact the optimal Pole Surface Ratio of the Conduit. New configurations should be checked to ensure that out-of-phase core elements properly disable the pole conduits.
[00135] Figures 9C and 9D represent a core element 210 that is effectively bar-shaped. The device represented is comprised of a permanent magnet 212, in a cylindrical shape fixed to the south pole conduit 211a and to the north pole conduit 211b with the cylindrical magnet encased in an optional protective non-ferrous support 213. This core element is another example of architecture flexible part of the invention in which virtually any form of magnet can have its respective magnetic field contained and redirected in virtually any form of pole conduit.
[00136] Figures 9E and 9F represent core elements 220 and 230. The modalities show examples of two different pole conduit shapes (222a, 222b and 232a, 232b) that can be used with only one permanent magnet shape 221 and 231 with permanent magnet field line 223 and 233 isolated from the south pole ducts 222a and 232a and from the north pole ducts 222b and 232b. Figure 9E has a south pole conduit 222a and a north pole conduit 222b formed to maximize magnetic performance. The curved shape tries to imitate the strength and shape of the magnetic field that emanates from the pole surface of permanent magnets. Figure 9F has south pole conduit 232a and north pole conduit 232b that are semicircular in shape, designed for easy retention on a support plate and use a circular shape for faster production using standard hole or drill sizes on the support plate .
[00137] Figures 9G and 9H provide examples of core elements 240 and 250 that use permanent magnets 241 and 251 that have a diametrically polarized disk shape. Figure 9G is a one-piece receptacle 243 that incorporates the south pole conduit 242a and the north pole conduit 242b. The single-piece receptacle 243 works in essentially the same way if it had separate pole ducts. This is possible by making the material adjacent to the permanent magnet field line 244 very thin and therefore unable to provide an effective magnetic coupling between the south pole conduits 242a and the north pole conduit 242b. Figure 9G also provides a circular shape that fits between a pole duct magnetic field optimally (which is often elliptical in shape) and economic considerations. Using this form, integration into a support plate can be facilitated by simply drilling or machining a hole of the same diameter in the plate. The cavities perpendicular to the material adjacent to the permanent magnet field line 244 can optionally be filled with any non-ferrous material. Figure 9H represents a south pole conduit 252a and north pole conduit 252b similar to those in Figure 9G; however, in this case a rectangular shape can be used if the final design requires a right-angle edge feature for guide or material support. Gap 253 eliminates most or all of the potential for magnetic coupling between the south pole conduit 252a and the north pole conduit 252b.
[00138] Figure 10 represents a support plate assembly 300 comprising a non-ferrous support plate 301 with integrated features for capturing or retaining the eight core elements, one of which is represented by 307 of the type described in Figure 9F. Each core element 307 has its permanent magnet field line 304 radially oriented with respect to the center of rotation of the support plate, and has the south pole conduit 302a oriented towards a south pole conduit 306a and north pole conduit 302b of the adjacent core element oriented in the direction of a north pole conduit 305b of adjacent core elements; that is, the orientation of the core elements is north-north / south-south / north-north / south-south. The fixing features 303 and 308 are integrated into the support plate.
[00139] In Figure 11, a support plate assembly 310, comprises a non-ferrous support plate 311 with integrated features for capturing or retaining the eight core elements, one of which is represented by 312 of the type described in Figure 9G. Each core element 312 has its permanent magnet field line 314 oriented circumferentially with respect to the center of rotation of the support plate and has magnetic field poles of adjacent core elements, oriented in opposite directions so that the north pole faces or south of the permanent magnets along the outside diameter have an alternating arrangement; that is, north / south-north / south. An important consideration when using this core element arrangement is to ensure that the spacing between opposite pole ducts 315 is sufficient to avoid substantial interaction which would degrade the performance of the core element. A minimum separation distance from the magnetic length of the magnet or permanent magnets (distance between the face of pole ducts), or in this case the diameter of the magnet, is usually adequate.
[00140] In Figure 12, a support plate assembly 320 comprises a non-ferrous support plate 321 with integrated features for capturing or retaining 12 core elements 322 of the type described in Figure 9G. Each core element 322 has its permanent magnet field line 323 oriented at a predetermined angle 324 defined by the number of core elements on the plate (in this example 12), and the number of revolutions that the core elements rotate around. their own 325 axes on the plate, in this example two revolutions or 720 °. This provides the precise relative rotation angle at which each magnet has to be oriented, in this case 720 ° / 12 = 60 °. This configuration results in each core element having a respective 60 ° rotational displacement between adjacent left and right core elements. As with the pan arrangement defined in Figure 11, an important consideration when using this core element arrangement is to ensure that the spacing between opposite pole conduits is sufficient to avoid a substantial interaction that could degrade the performance of the core element. A minimum separation distance from the magnetic length of the magnet or permanent magnets (distance between the pole conduit faces), or in this case the diameter of the magnet, is usually adequate.
[00141] In Figure 13, a support plate assembly 330, comprises a single piece non-ferrous support plate 331 with integrated features for capturing or retaining the 18 core elements one of which is represented by 332 of the type described in Figure 9G. Each core element 332 has its permanent magnet field line 333 circumferentially oriented with respect to the plate. The north and south pole conduits of the permanent magnets alternate their orientations at a predetermined interval, in which the amount of core elements in the plate is equal to the desired actuation angle and the equal amount of adjacent core elements of the pole conduit. In this example, it is desired to have an alternating core element pattern after every three core elements with an actuation angle of 120 °. The actuation angle contains an equal amount of alternating magnetic pole core elements followed by an equal amount of core elements aligned out of phase (three with the north pole facing outward then three with the south pole facing outward) . If there are six core elements located every 120 °, a total of 6 x 3 (360 ° / 120 °) or 18 core elements are required on a support plate. The actuation angle must be an entire 360 ° divisible (1, 2, 3, 4, 5, 6 etc.). As with the plate arrangement defined in Figures 11 and 12, an important consideration when using this core element arrangement is to ensure that the space between opposite pole ducts 335 is sufficient to avoid a substantial interaction that could degrade the performance of the core element. core. The space between opposite pole ducts 335 is shown as a group of insulation holes between opposite pole ducts just for clarity. On a 331 non-ferrous support plate, insulation holes are not required. If the plate were ferrous, the actuation angle 334 would have the insulation holes present to prevent short circuits of the opposite pole ducts.
[00142] Figure 14, a support plate set 340, consists of a single piece ferrous support plate 341 with integrated features for capturing or retaining 8 diametrically polarized permanent magnets, three of which are designated 342, 343, and 344 The magnets are oriented so that the similar poles of adjacent magnets are facing each other. The shared north pole conduit 345b and shared south pole conduit 345a are created having material 346 and 347 adjacent to the minimized permanent magnet field line 348 to isolate magnetic fields of opposite polarity along the permanent magnet field line 348. A The area of "shared" pole ducts is defined in the same way as in the definition of individual pole ducts. Note that the "shared" north pole conduit area 345b and shared south pole conduit 345a now have to use the pole conduit surface area of two adjacent permanent magnets when determining the appropriate spacing between permanent magnets. In doing so, a core element is effectively half the area of the shared north pole duct 345b and half of the area of the shared south pole duct 345a and a permanent magnet 342 magnetically matched to the prescribed method. The functionality of the support plate set 340 is similar to the functionality of the support plate set 300 described in Figure 10, although the support plate set 340 contains significantly fewer components compared to the support plate set 300 and is considerably stronger in a smaller occupation area. The advantages of the support plate set 300 are primarily weight reduction, a large footprint for stability and a shallower depth of magnetic field more suitable for thin materials.
[00143] In Figure 15, a support plate set 350, comprises a single piece ferrous support plate 351 with integrated features to capture or retain 16 diametrically polarized permanent magnets, two of which are designated 352 and 353, of different diameters . Each permanent magnet 352 and 353 has its respective permanent magnet field line 354 and 355 radially oriented. The pole ducts of the magnets are oriented so that the similar poles of permanent adjacent magnets are symmetrically facing similar poles of permanent adjacent magnets so that the ferrous material between these magnets becomes the "shared" 357b north pole duct and pole duct "shared" south 357a. The insulation between the "shared" north and south pole conduits 357b and 357a is achieved by minimizing the material 356 and 358 adjacent to the permanent magnet field line 354 and 355. The area of the "shared" pole conduits is defined in the same way than in the definition of individual pole conduits. Note that the area of the "shared" south pole conduit 357a and the "shared" north pole conduit 357b uses the pole magnet surface area of four adjacent permanent magnets when determining the appropriate spacing between permanent magnets. In doing so, a core element can now be defined as combining half the "shared" north pole conduit area 357b combined with half the "shared" south pole conduit area 357a and magnetically matched permanent magnets 352 and 353 in the prescribed method. The functionality of the support plate set 350 is similar to the functionality of the support plate set 340 shown in Figure 14. Although the support plate set 350 has the same outer diameter as the support plate set 340, the inner diameter is smaller since it accommodates eight additional permanent magnets with a smaller diameter 353. This increases the magnetic work surface area of the plate, providing a stronger breaking force than the support plate assembly 340. The additional addition of permanent magnets of different sizes allows not only the optimization of the pole surface ratio of the magnet to the working surface area of the pole conduit, but also the precise dimensioning of the support plates to a desired internal or external diameter requirement for integration into products or devices.
[00144] Figure 16 represents a support plate assembly 360 comprising a single piece ferrous support plate 361 with radially drilled features to capture or retain 14 diametrically polarized cylindrical permanent magnets, one of which is denoted 362. Each of Permanent magnets are oriented so that similar poles of adjacent magnets are facing each other. The "shared" north pole conduit 365b and the "shared" south pole conduit 365a are created by having material 363 and 364 adjacent to permanent magnet field line 368 designed to minimize material 363 and 364 adjacent to the permanent magnet field 368 and above and below the permanent magnets along the permanent magnet field line 368. The reduced wall thickness of the material 363 and 364 adjacent to the permanent magnet field line 368 helps to isolate the magnetic fields from polarity opposite along the permanent magnet field line 368. The area of the "shared" south pole conduit 365a and the "shared" north pole conduit 365b is determined by the pole magnet surface area of two adjacent bar-shaped permanent magnets (instead of the cylindrical surface area) when determining the appropriate ratio of the pole magnet surface to the pole duct work surface area. In doing so, a core element can now be defined as combining half the "shared" north pole conduit area 365b combined with half the "shared" south pole conduit area 365a and a permanent magnet 362 magnetically matched in the method prescribed. The functionality of the support plate set 360 is similar to the other "shared" multi-element plate sets such as those shown in Figures 14 and 15, although this support plate set contains for purposes of illustration 14 core elements.
[00145] In Figure 17, a support plate assembly 370 comprises a single piece ferrous support plate 371 with features positioned radially to capture or retain 14 bar-shaped permanent magnets one of which is denoted 372. Permanent magnets bar-shaped are oriented so that the similar poles of permanent adjacent magnets are facing each other. The "shared" north pole conduit 375b and "shared" south pole conduit 375a are created by having bar-shaped pouches, one of which is denoted 374, for permanent magnets designed to minimize material 373 adjacent to the permanent magnet field line 378 below the permanent magnets and material 373 along the vertical edge of the permanent magnet field line of the permanent magnets. Material 373 adjacent to the permanent magnet field line 378 helps to isolate magnetic fields of opposite polarity along the material adjacent to the permanent magnet field line Alternatively, material 373 along the vertical edge can be removed by drilling a hole in the along the permanent magnet field line 378. Again, the area of the "shared" south pole conduit 375a and the "shared" north pole conduit 375b is determined by the surface area of the magnet pole of two permanent bar magnets when determining the appropriate ratio of the magnet pole surface to the pole duct work surface area. In doing so, a core element can be defined as the combination of half the "shared" north pole conduit area 375b combined with half the "shared" south pole conduit area 375a and a permanent magnet 372 magnetically matched in the prescribed method . The functionality of the support plate set 370 is similar to that of the support plate set shown in Figure 16.
[00146] In Figure 18, a support plate assembly 380, comprises a single piece ferrous support plate 381 with radially positioned permanent magnet pockets, three of which are represented by 383a, 383b, and 383c, incorporated to capture or retain eight groups of bar-shaped permanent magnets, one of which is represented by 382. Each group of bar-shaped permanent magnets, three of which are represented by 382, 384, and 385 contain the same volume and degree of permanent magnets oriented in the same direction along the permanent magnet field line with different magnetic lengths Lm contained in each of the permanent magnet bags each group of bar-shaped permanent magnets effectively behaves like a larger individual magnet in a similar way. The magnet groups are oriented so that similar poles of adjacent magnet groups are facing each other. North pole ducts and "shared" south pole ducts are created by having permanent magnet pockets designed to minimize material thickness below the permanent magnet groups and material along the vertical edge of the permanent magnets as previously described in Figure 17. The functionality of the support plate set 380 is similar to the support plate set shown in Figure 17; however, the use of multiples in permanent bar-shaped magnets is advisable when the size of the support plate is large enough that single magnets of the same size are not readily available, that is, substantially reduced in efficiency due to manufacturing difficulty of large permanent magnets. This configuration is revealed to demonstrate the highly flexible nature of this architecture, and the ability to make very large support plate configurations.
[00147] Figure 19 illustrates a pair of non-ferrous support plate sets 400 comprised of a first support plate set 401a and a second support plate set 401b, each support plate set basically as previously described in Figure 10. A relative rotation of the actuation angle 402, equal to the angle between the core elements, allows the alignment of the first core element 403a in the first support plate set with the corresponding second core element 403b in the second plate set. support. The rotation of the first support plate assembly by the actuation angle 402 between the core elements so that the first north pole conduit 405a and first upper south pole conduit 404a are aligned with the second south pole conduit 404b and second pole conduit north 405b is considered an "out of phase" alignment, which deactivates the set. Subsequent realignment of the first north pole conduit 405a and the first south pole conduit 404a with the second north pole conduit 406b and second south pole conduit 407b is considered a "in phase" alignment, which activates the pair of plate sets non-ferrous support. It is important to note that the arrangement of the pole ducts in the support plate as described in Figure 10 allows the simultaneous activation of all the core elements when aligned in phase and in contrast to the simultaneous deactivation of all the core elements when aligned out of phase . The angle of activation / deactivation of the device is defined by the rotation angle alternating between phase and out of phase, which in this figure is also the angle of action 402 between the core elements. The actuation angle 402 between the core elements is also defined as 360 ° / number of alternating core elements (eight) or 360/8 = 45 °. The machined groove 408 is designed to accommodate a "friction reduction means", in this example, it can be a very low friction coefficient seal ring made of polytetrafluoroethylene (PTFE or Teflon®) or a ball bearing arrangement . This is shown by way of example only, and not by way of limitation since there are many methods designed to obtain these friction reduction means.
[00148] Figures 20A, B, C and D illustrate a pair of non-ferrous support plate assemblies 410 comprised of upper support plate assembly 411a and lower support plate assembly 411b, each of which is basically represented above in Figure 12. Briefly summarized and as shown in Figure 12, the angle between each of the twelve adjacent core elements on each plate is 30 ° and the relative rotation of each adjacent core element around its axis 325 is 60 °.
[00149] In Figure 20A, each of the core elements in the upper support plate assembly 411a is aligned out of phase with the corresponding core elements in the lower support plate assembly 411b. This results in deactivation of the 410 non-ferrous support plate pair.
[00150] In Figure 20B, the upper support plate set 411a was rotated by the actuation angle 413 of 30 ° relative to the lower support plate set 411b. This allows axial alignment of the upper permanent magnet 412a with the corresponding lower permanent magnet 412b and results in a partial alignment of the pole ducts surrounding the upper permanent magnet 412a with the pole ducts in the lower permanent magnet 412b, resulting in a slight activation of all the core elements when the relative position of the individual elements of the upper core is 60 ° from being aligned out of phase with the individual elements of the lower core.
[00151] In Figure 20C the upper support plate set 411a was rotated again by the actuation angle 413 of 30 ° relative to the lower support plate set 411b. This results in substantial activation of all of the core elements when the relative position of the individual elements of the upper core is 60 ° from being aligned in phase with the individual elements of the lower core.
[00152] In Figure 20D, each of the core elements in the upper support plate assembly 411a is phase aligned or aligned with each of the corresponding core elements in the lower support plate assembly 411b. This results in activation of the 410 non-ferrous support plate pair.
[00153] The configuration represented by Figures 20A, B, C and D is intended to provide a variable stepped actuation force device. The breaking force calibration is necessary to confirm the performance level at each angle 413 between out-of-phase alignment core elements for in-phase alignment. The relative rotation of the predetermined angle 324 of the core element 322 of Figure 12 can be adjusted to provide a partial activation ratio for complete activation. This is useful when trying to find safety standards that specify a safety factor. Currently ASTM B 30 (ASTM International formally known as the American Society for Material Testing) Below the Hook elevation standard specifies a 3: 1 safety factor for switchable magnetic elevation. As an example, on a lift device with a breaking force of 1360.8 kg, a safety factor of 3: 1 indicates that the maximum lift with that device should not exceed 453.3 kg. It works well as long as the operator knows the target's weight, and the target conforms to the ideal material thickness. With the proposed invention, an operator can simply position the device on the material, lift a very small amount with it partially activated and calibrate to a 3: 1 safety factor. If the device remains attached, the operator must lower the material, and then fully activate the device. He can then safely lift the material a safety factor of 3: 1 without knowing the precise weight of the material.
[00154] Figures 21 A, B, C and D illustrate a pair of non-ferrous support plate assemblies 420 comprised of upper support plate assembly 421a and lower support plate assembly 421b, each of which is basically described previously in Figure 13. Each of the support plate assemblies contains 18 core elements and has an angle between core elements of 20 ° with a change in polarity for every three adjacent core elements which defines the actuation angle 422, in this case, 60 °. In Figure 21A, each of the core elements in the upper support plate assembly 421a is aligned out of phase with the core elements in the lower support plate assembly 421b, resulting in the deactivation of the pair of non-ferrous support plate assemblies 420 In Figure 21B, the upper support plate assembly 421a has been rotated 20 ° clockwise (the angle 424 between adjacent core elements) relative to the lower support plate assembly 421b. This results in an activation of one third of the pairs of core elements, as exemplified in the Figure by the upper core element 425a and the corresponding lower core element 427b.
[00155] In Figure 21C, the upper support plate assembly 421a has been rotated clockwise again from the position shown in Figure 21B by an angle 424 of 20 ° between core elements relative to the lower support plate assembly 421b. This results in activation of two thirds of all the upper core elements, two of which are represented as 425a and 426a, as well as their corresponding lower core elements 426b and 427b, when the relative position of the individual core elements is 40 ° clockwise from the deactivated position or out of phase alignment.
[00156] In Figure 21D, the upper support plate assembly 421a has been rotated clockwise from the position shown in Figure 21C by an angle 424 of 20 ° relative to the lower support plate assembly 421b. This results in activation of all the upper and lower core elements as exemplified by the corresponding core element pairs 425a and 425b, 426a and 426b, and 427a and 427b when the upper support plate assembly 421a has rotated through the actuation angle 422 so that the relative position of the individual core elements is 60 ° clockwise, from the out-of-phase aligned or disabled position shown in Figure 21 A. The pair of non-ferrous support plate sets 420 is now fully activated.
[00157] The configuration represented by Figures 21 A, B, C and D is intended to provide a lifting device with a defined safety factor. Unlike the device shown in Figures 20A, B, C and D, the breaking force calibration is not necessary. Activating one third of the core elements as described in Figure 21B, the breaking force is precisely one third of the breaking performance of the fully activated device. This device is ideally suited to meet the 3: 1 safety specifications identified by ASTM B 30 under the Hook Lifting Standard, without the operator knowing the weight of the target material being lifted or if the target material is magnetically supersaturated which may result in decreased lifting performance as seen with current switchable magnet technology lifts.
[00158] With the proposed invention, an operator can simply position the device on the material (even if it is thinner than the ideal thickness) and raise it a short distance with one third of the activated core elements as shown in Figure 21B. If the device remains stuck, the operator can then lower the material and fully activate the device by rotating the upper support plate assembly 421a to the position shown in Figure 21D. The material can now be lifted with the prescribed 3: 1 safety factor without knowing the precise weight or saturation capacity of the material.
[00159] As an example, assuming an operator is lifting a 400 series magnetic stainless steel piece; the operator is aware that the target weighs 272 kg and the lifting magnet is rated at 1360.8 kg. The operator believes that it is within the 3: 1 safety level and proceeds to lift the material, which falls soon afterwards during the movement. What the operator did not know is that the magnetic force is based on the composition and finish of the material being raised. Series 400 stainless steel has approximately 50% of the clamping force of mild steel. Cast iron has approximately 40% of said fixing force, while rough finishes can impact performance by more than 50%. The device is capable of lifting only 680.4 kg in stainless steel of the 400 series and around 544.3 kg of cast iron. If the operator had used the configuration specified in Figure 21A and performed an elevation test with the device as shown in Figure 21B, he would have seen that the device detaches from the material once it has exceeded 226.8 kg. Point at which it would be necessary to increase the elevation with a second, stronger unit or unit.
[00160] The configuration shown in Figure 21A is shown by way of example, not by way of limitation, and is just one of many different possible configurations. The concept works with "shared" pole conduits (ferrous support plates) as well as a myriad of different magnet shapes and sizes, as well as pole conduit shapes and sizes or core element configurations. The configuration also lends itself to be readily adapted to many different safety factors simply by adjusting the number of individual core elements contained in the actuation angle 422.
[00161] Figures 22A and B illustrate a pair of ferrous support plate assemblies 430 comprised of upper support plate assembly 432 and lower support plate assembly 433, each of which is basically described previously in Figures 17 and 16 , respectively. A relative rotation equal to the actuation angle 431 between the core elements allows for a realignment of the core elements in the upper support plate assembly with the corresponding core elements in the lower support plate assembly. As in Figure 19, the angle of activation / deactivation of the device is defined by the angle of rotation alternating between alignment in phase and out of phase, which in this Figure is also the angle of actuation 43. The angle of actuation 431 is also defined as 360 ° / number of alternating core elements (14) or 360 ° / 14 = 25.71 °.
[00162] Figures 22A and B also illustrate a combination of two different support plates using permanent magnets in a different way. Although the working surface areas of the upper support plate assembly 432 and the lower support plate assembly 433 are not identical, the arrangement will still work properly as long as the Conduit Pole Surface Ratio is met for each of the assemblies support plate, and the combined fields are neutralized when each of the upper core elements is combined with a lower core element. In addition, the ferrous support plate assembly 430 represents a potentially ideal configuration in that the "shared" pole conduits in the upper support plate assembly 432 have a stronger magnetic field than the "shared pole conduits" "in the lower support plate assembly 433. The core elements in the upper support plate assembly 432 can be designed to have a different flow density than those in the lower support plate assembly 433 to compensate for the anticipated distance from the air gap between the support plates due to the use of friction reduction means (such as PTFE 434 sealing ring or ball bearings between the plates). When the support plate assemblies are aligned out of phase, the core elements in the upper support plate assembly 432 can potentially completely mask the core elements in the lower support plate assembly 433 and reverse the field flow in the target o that should demagnetize the target and allow for easy release. In essence, this support plate set configuration can create a repellent magnetic field that can be used to separate the target from the Rotatable Switchable Magnet. When using stronger core element magnet assemblies on the upper support plate assembly, the fully deactivated position can be at a slight angular displacement from 0 ° so that the magnetic flux from the upper core element magnet assembly will cancel out completely the magnetic field of the lower core element magnet assembly as well as overcome the losses of the air gap. Complete alignment at 0 ° results in a slight inversion of the magnetic polarity of the core elements in the lower support plate assembly.
[00163] The machined groove 435 of Figure 22B is designed to accommodate a "friction reduction means". There are many ways to effect these friction reduction means, including without limitation a very low friction coefficient seal ring made of polytetrafluoroethylene (PTFE or Teflon®), ball or roller bearings, etc. This is shown by way of example only, and not by way of limitation, since there are many methods that a person of ordinary skill in the art can employ to obtain these friction reduction means.
[00164] Figures 23A and 23B illustrate a simple RSM 500 device. The RSM 500 device consists of eight core elements contained in a top support plate set 503a and eight corresponding core elements contained in a plate set lower support 503b, friction reduction means 508, protective casing 501 and recessed hole features one of which is represented as 505, designed to allow access to the open area between the stationary integration component 502. Friction reduction means 508 are positioned between the upper support plate assembly 503a and the lower support plate assembly 503b. The protective enclosure 501 is secured by means of integration fastening means two of which are represented as 507 for the upper support plate assembly 503a. The integration component 502 is fixed to the inner circumference of the lower support plate assembly 503b by means of fixing means, one of which is represented as 509. The positional retaining means, one of which is represented as 504, are inserted in resources countersunk hole in the lower support plate assembly 503b, which are used to fit with retaining points, one of which is represented as 506, located in the protective housing. When the RSM device 500 is on a target, a relative rotation of the protective housing 501 with respect to the stationary integration component 502, will consequently rotate the upper support plate assembly 503a to adjacent holding points 506 where the holding means positional 504 fit, in order to activate or deactivate the device. Figure 23A is a simple illustration by way of example and not limitation, which demonstrates the concept of the manually activated product with a feature for integration into other products or devices. In this example, the integration component can be incorporated or replaced with another method of fixation.
[00165] Figure 24 is an RSM 600 device for use in automated or robotic applications and is a demonstration of the highly flexible architecture of the device. Essentially any of the support plate set 601 combinations with another support plate set not shown but disclosed in this document or that can be employed by one with an individual with common knowledge of the art, can be incorporated into a receptacle 602 that holds a first support plate assembly, while allowing a second support plate assembly, fixed to actuation means 603, to rotate the actuation angle required to activate and deactivate the apparatus. The actuation means 603 depicted can be a motorized, hydraulic, pneumatic or solenoid driven unit, although many other actuation methods can be used, including without limitation temporary electrical methods that can momentarily disable or increase the device through the use of an electromagnet with a similar pole pole arrangement that can be used to activate or deactivate a single support plate set or a combination of support plate sets.
[00166] Figure 26 illustrates stacked ferrous support plate assemblies 700 comprised of swivel support plate assembly 701 and integrated support plate receptacle assembly 702. A relative rotation between the rotating support plate assembly and the assembly of integrated support plate receptacle allows the realignment of the core elements in the rotating support plate assembly with respect to the corresponding core elements in the integrated support plate receptacle assembly. Figure 26 further illustrates a combination of a rotating support plate assembly with an integrated support plate receptacle having substantially different shapes. In this configuration, an integrated support plate receptacle is used to minimize the number of parts needed to assemble while providing fastening features and an ergonomic or aesthetic design. The 705 integrated receptacle is constructed of a single piece of ferrous steel, with 707 mounting holes incorporated. The magnetic insulation features, one of which is represented as 706, are essentially cut in the material designed to restrict the shape and area of the pole ducts, allowing the alignment of the pole ducts in the 701 swivel plate plate assembly and in the receptacle assembly integrated support plate 702. In this configuration a needle bearing set 703 is used due to the high attractive forces. A recessed area 709 is incorporated into the integrated receptacle 705 to accommodate the needle bearing assembly and provide minimal air clearance between the swivel support plate assembly 701 and the integrated support plate receptacle assembly 702 over most of the of the pole conduit surface. A common center of rotation 704 is used to maintain precise alignment between the rotating support plate set 701 and the integrated support plate receptacle set 702. As with other support plate sets shown above, the use of multiple magnets 708 instead of a single larger magnet it provides flexibility in magnet selection, strength optimization, use of shelf parts, as well as other benefits described above.
[00167] Figure 27 illustrates a single layer matrix of non-ferrous support plate assemblies 750, comprised of integrated non-ferrous support plate receptacle set 751 and multiple corresponding rotating support plate sets 752 and 753. The assembly integrated non-ferrous support plate receptacle 751 comprises an integrated non-ferrous support plate receptacle assembly 755 that incorporates recessed features, one of which is represented as 754, and provides retention means while accommodating the insertion of the swivel support plate sets 752 and 753. Each combination of swivel support plate sets and corresponding part of the integrated non-ferrous support plate receptacle set can be activated individually or together.
[00168] Figure 28 illustrates a single layer matrix 800 of ferrous support plate assemblies, the lower part of the layer comprised of an integrated ferrous support plate receptacle 801 and the upper part of the layer comprised of a ferrous support receptacle. turntable 805 with multiple sets of turntable support plates 802, 803, and 804 inserted in it. The integrated ferrous support plate sets 812, 813 and 814 are integrated into an integrated ferrous receptacle 806. The rotary support plate sets 802, 803, and 804 are contained within the rotary plate receptacle 805. A relative rotation of one or more 802, 803, or 804 rotating support plate sets enable or disable the magnetic fields emanating from the corresponding part of the integrated ferrous support plate receptacle assembly. Magnetic isolation features, one of which is represented as 808, are used to prevent opposing magnetic fields from neutralizing each other. Threaded holes, one of which is represented as 807, provide a fixing point on the rotating support plate assembly 802, as a possible means for rotating the rotating support plate assembly 802 relative to the support plate receptacle portion corresponding ferrous integrated 801.
[00169] Figure 29 illustrates a dual layer array of ferrous support plate sets 850 comprising a first array of layers of ferrous support plate sets 851 and a second array of layers of ferrous support plate sets 861. The first layer array 851 comprises a first layer of integrated ferrous support plate receptacle set 852 and a first layer of corresponding swivel support plate sets 853, 854, and 855. The second layer array of plate support sets ferrous support 861 comprises a second layer of integrated ferrous support plate receptacle set 862 and a second layer of corresponding swivel support plate sets 863, 864, and 865. the rotating support plate sets 853, 854, and 855 are inserted into the 870 dual-layer turntable receptacle and are paired with the corresponding support plate sets on the first integrated ferrous support plate receptacle 852. The rotating support plate assemblies 863, 864, and 865 are inserted into the dual layer rotating plate receptacle 870 and are paired with the second layer of ferrous support plate receptacle assembly corresponding integrated 862. The first and second layers of integrated ferrous support plate sets 852 and 862 respectively, are fixed in their respective integrated ferrous receptacles 856 and 866. A relative rotation of one or more rotating support plate sets 853 , 854, or 855 activates or deactivates the magnetic fields emanating from the corresponding part of the first layer of integrated ferrous support plate receptacle set 852. A relative rotation of one or more support plates 863, 864, or 865 activates or deactivates the magnetic fields emanating from the corresponding part of the second layer of ferrous support plate receptacle assembly integrates 862. The 875 magnetic insulation gap provides magnetic insulation between the rotating support plate assemblies. The speed limitation slots, one of which is represented as 871, allow an axis to be inserted into the rotating support plate assembly 853 to extend through the speed limitation slot 871 allowing the respective part of the first to be activated or deactivated. layer 851 of support plate sets.

权利要求:
Claims (5)
[0001]
1. Multi-core rotatable switchable device based on permanent magnet to fix, secure, or lift a desired target, comprising: a plurality of support plate sets (340, 350, 360, 370, 380, 400, 401a, 401b , 410, 411a, 411b, 420, 421a, 421b, 430, 432, 433, 503, a, 503b, 601, 700, 701, 750, 752, 753, 800, 802, 803, 804, 812, 813, 814 , 850, 851, 853, 854, 855, 861, 864, 865), each of which is comprised of a support plate (341, 351, 361, 371, 381) and a plurality of core elements (403a, 403b, 424a, 425b, 426a, 426b, 427a, 327b) integrated therein; each core comprising one or more permanent magnets (342, 343, 344, 352, 353, 362, 372, 374, 382, 384, 385, 412a, 412b, 708) with a magnetic north pole and a magnetic south pole; the support plate (341, 351, 361, 371, 381) comprising two magnetically soft or hard pole conduits (345a, 345b, 357a, 357b, 365a, 365b, 375a, 375b, 404a. 404b, 405a, 405b, 406b , 407b), each of the permanent magnet pole ducts or permanent magnets having a pole duct face and in which each is adjacent and fixed to the two pole ducts, the permanent magnet or permanent magnets within each element of core oriented so that the magnetic north pole of the permanent magnet or the magnetic north poles of the permanent magnets are adjacent and fixed to a pole conduit and the magnetic south pole of the permanent magnet or the magnetic south poles of the permanent magnets are adjacent and fixed to the another pole conduit, in which said pole conduits are capable of containing and redirecting the magnetic fields of the permanent magnet or permanent magnets; rotatable support plate sets adjacent to each other and in different geometric planes where each support plate set retains or holds multiple core elements so that the north and south pole conduits of the core elements in a plate set support elements correspond to or align with the north and south pole conduits of the core elements in an adjacent rotating support plate assembly in order to redirect the magnetic fields contained in the permanent magnet magnetic poles or permanent magnet magnetic poles to a corresponding core element of an adjacent rotatable support plate assembly or the desired target; an integrated non-ferrous support plate receptacle (751) comprising an integrated non-ferrous support plate receptacle assembly (755) which incorporates recessed features (754), and provides retention means while accommodating the insertion of the assemblies rotating support plate (752, 753); each rotatable support plate assembly being separated from an adjacent rotatable support plate assembly by friction reduction means to reduce friction between adjacent rotatable support plate assemblies and facilitate rotation of the support plate assembly with respect to the assembly adjacent rotating support plate; the magnetic field emanating from the pole ducts adjacent to the target being deactivated when the pole ducts are aligned out of phase, that is, all magnetic fields emanating from the pole ducts in a rotating support plate assembly are deactivated or reduced to a desired level, so that the south pole ducts (S) of the core elements in a support plate assembly are juxtaposed with the corresponding north pole ducts (N) of the core elements in the rotatable support plate assembly adjacent (SN) and the north pole ducts (N) of the core elements in the rotatable support plate assembly are juxtaposed with the corresponding south pole ducts (S) of the core elements in the adjacent support plate assembly (NS) ; being activated when the pole ducts are aligned in phase, that is, all magnetic fields emanating from the pole ducts in a rotating support plate set are activated or increased to a desired level, so that the south pole ducts (S) of the core elements in a rotating support plate assembly are juxtaposed with the corresponding south pole conduits (S) of the core elements in the adjacent support plate assembly (SS) and the north pole conduits (N) the core elements in a support plate assembly are juxtaposed with the corresponding north pole conduits (N) of the core elements in the adjacent support plate assembly (NN); and being partially activated or deactivated when the pole ducts are partially aligned or in phase or out of phase, that is, the magnetic fields emanating from the pole ducts in a support plate assembly are adjusted to a desired level; characterized by the fact that the pole conduits (345a, 345b, 357a, 357b, 365a, 365b, 375a, 375b) are an integral part of the support plate, in which the north pole conduit of a first permanent magnet of the one or more permanent magnets of a core element being shared with a north pole conduit of a permanent magnet or adjacent permanent magnets and said south pole conduit of the first permanent magnet being shared with a south pole conduit of another permanent magnet or magnets adjacent permanent magnets of the one or more permanent magnets of another adjacent core element.
[0002]
2. Multi-core rotatable switchable device based on permanent magnet to fix, secure, or lift a desired target, according to claim 1, characterized by the fact that said one or more permanent magnets (342, 343, 344, 352 , 353, 362, 372, 374, 382, 384, 385, 412a, 412b, 708) comprise electromagnets to create the magnetic north pole or magnetic north poles and the magnetic south pole or magnetic south poles.
[0003]
3. Multi-core switchable rotary element device based on permanent magnet to fix, secure or lift a desired target, according to claim 1 or 2, characterized by the fact that it comprises positional retention means configured to limit the rotation angle of the plates support.
[0004]
4. Multi-core rotatable switchable device based on permanent magnet to fix, secure, or lift a desired target according to any one of claims 1 to 3, characterized in that the pole ducts or support plates are provided with a coating and / or plating.
[0005]
5. Multi-core switchable rotary element device based on permanent magnet to fix, secure, or lift a desired target according to any one of claims 1 to 4, characterized by the fact that pole ducts or support plates are encapsulated.

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同族专利:

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公开号 | 公开日

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KR20140110882A|2014-09-17|

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CA2856138A1|2013-06-13|

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EP2795634A1|2014-10-29|

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AU2012348218B2|2017-06-22|

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CA2856138C|2020-12-15|

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US8350663B1|2013-01-08|

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BR112014013849A2|2017-06-13|

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CN103988267B|2017-09-08|

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AU2012348218A1|2014-06-05|

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SG11201403705QA|2014-10-30|

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BR112014013849A8|2017-06-13|

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EP2795634B1|2020-11-04|

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CN103988267A|2014-08-13|

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KR101995092B1|2019-07-01|

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WO2013085772A1|2013-06-13|

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法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

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2019-10-15| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2020-12-22| B09A| Decision: intention to grant|

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2021-02-02| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/11/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US13/313,315|2011-12-07|

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US13/313,315|US8350663B1|2011-12-07|2011-12-07|Rotary switchable multi-core element permanent magnet-based apparatus|

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PCT/US2012/066834|WO2013085772A1|2011-12-07|2012-11-28|Rotary switchable multi-core element permanent magnet-based apparatus|

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