• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Magnetic coupling (2) comprising a first cylindrical magnet unit (6) and a concentrically disposed second cylindrical mag net unit (8), wherein the second cylindrical magnet unit (8) is rotatably arranged in the first cylindrical magnet unit (6). The magnetic coupling (2) comprises an inner part (16) which is mounted in a first bearing (12). The magnetic coupling (2) comprises an outer part (4) which is mounted in a second bearing (14). The magnetic coupling (2) comprises a first end (20) arranged for securing a first shaft (34), the magnetic coupling (2) comprising a second end (22) arranged for securing a second axis (36). The magnetic coupling (2) comprises a mechanically adjustable mechanism which displaces the first cylindrical magnet unit (6) axially with respect to the second cylindrical magnet unit (8).
    公开号:DK201400164A1
    申请号:DK201400164
    申请日:2014-03-21
    公开日:2015-10-05
    发明作者:Jens Lindholm Mortensen
    申请人:Technoflex Aps；
    IPC主号:
    专利说明:

    Magnetkobiing
    Description
    FIELD OF THE INVENTION
    The present invention relates to a magnetic coupling comprising a first cylindrical magnet assembly and a concentrically disposed second cylindrical magnet assembly wherein the second cylindrical magnet assembly is rotatably disposed in the first cylindrical magnet assembly.
    BACKGROUND OF THE INVENTION When a drive is connected e.g. a motor via a shaft, it will often be ensured that the drive unit is not overloaded in the event that the motor transmits a greater torque to the drive than intended. To avoid overloading the drive unit, a coupling is often inserted between the motor and the drive unit, so that the coupling disconnects the drive from the shaft when the torque or change of torque exceeds a predefined level.
    It is known to use magnetic couplings to protect drive units in various contexts. Many magnetic couplings have a limited scope because they have a fixed disconnect torque, which is a disadvantage if one wants to use the same magnetic coupling for different drives.
    By the term "decoupling torque" is meant torque whereby the magnetic coupling decouples. The decoupling moment, among other things, determined the strength of the magnetic units.
    Therefore, it is desirable to design a magnetic clutch where the torque can be changed relative to the maximum load capacity of the drive, so that the same magnetic clutch can be used for different purposes.
    The object of the invention
    The object of the present invention is to provide a magnetic coupling in which the magnetic torque can be changed manually.
    The magnetic coupling according to the invention is a magnetic coupling comprising a first cylindrical magnetic unit and a concentrically disposed second cylindrical magnetic unit, the second cylindrical magnetic unit being rotatably arranged in the first cylindrical magnetic unit, the magnetic coupling comprising an inner part housed in a first bearing, where comprises an outer portion housed in a second bearing, wherein the magnetic coupling comprises a first end arranged for securing a first shaft, wherein the magnetic coupling comprises a second end arranged for securing a second shaft. The magnetic coupling comprises a mechanically adjustable mechanism which displaces the first cylindrical magnet unit axially with respect to the second cylindrical magnet unit.
    Hereby a magnetic coupling is obtained, where the torque can be changed in relation to the maximum load capacity of a drive unit, so that the same magnetic couplings can be used for different purposes.
    The first cylindrical magnet assembly and the second cylindrical magnet assembly may have any applicable size and geometry.
    By disposing the second cylindrical magnet unit, rotatably is arranged in the first cylindrical magnet unit in a manner whereby the two magnet units are axially displaceable relative to each other, it is possible to adjust the magnetic attraction between the two magnet units, so that the torque can be adjusted. .
    The inner dough can have any useful design.
    The bearings used may advantageously be maintenance-free or very low-maintenance bearings of any usable type,
    The magnetic coupling comprises a mechanically adjustable mechanism which displaces the first cylindrical magnet unit axially with respect to the second cylindrical magnet unit. The adjustable mechanism may be of any useful nature,
    It may be advantageous if the mechanical adjustable mechanism comprises an adjusting unit comprising a screw device, said screw device being arranged to displace the first cylindrical magnet unit axially relative to the second cylindrical magnet unit.
    This provides the possibility to adjust the adjustable mechanism by means of a simple and robust mechanism which enables stepless adjustment and allows manual adjustment of the decoupling torque,
    It is preferred that the screw is positioned so that there is easy access for manual adjustment of the screw,
    It may be an advantage that the first bearing and / or the second bearing is a ball bearing.
    This provides the opportunity to provide a magnetic coupling that is affordable and even robust.
    It may be advantageous that the first cylindrical magnetic unit be disposed in a steel casing,
    The steel sheath protects the magnets, thereby increasing the range of application of the magnetic coupling, thereby obtaining a magnetic coupling that is tolerant to moisture and water, so that the magnetic coupling can be used in an aggressive environment,
    They may be advantageous in that the magnetic coupling comprises an end piece and a steel sheath, and that the style sheath, at least one end, is braced on an end piece.
    Hereby it is possible to provide a tight closure of the steel sheath in a simple and secure manner.
    It may be convenient that a ball bearing is disposed between the end piece and the inner part. In this way it is possible to provide an optima! seating.
    It may be advantageous for the inner portion to comprise a first narrow region and a second wide region, the narrow region having a first thickness which is significantly narrower than the thickness of the wide region.
    This provides the opportunity to use the transition between the narrow and the wide area as the contact surface or stop for one of the magnetic coupling's magnetic unit.
    It may be an advantage that the inner portion comprises a abutment unit comprising at least one abutment extending radially outwardly relative to the narrow area of a first thickness.
    This provides the opportunity to provide a simple mechanical restriction on the displacement range of the magnetic units.
    It may be advantageous that the outer portion and / or the magnetic units are coated with a sol-gel coating.
    The sol-gel coating can be produced by applying to the surface a slurry of active substances, in the curing process, the active substances form chemical compounds with each other, thereby forming a protective layer whose nature depends on the constituent substances. It may be convenient to use preferably monomers and / or metal oxides.
    This provides the possibility of providing a corrosion resistant solution where magnets are protected from moisture.
    It may be desirable that the sol-gel coating be at least 3 microns thick.
    This provides a strong and robust protection of the magnets.
    The magnetic coupling must ensure that a drive unit is not exposed to unintentional overload when the drive unit is connected e.g. an engine. The motor and drive unit will typically be rotatably attached to each shaft, with the two shafts interconnected in the magnetic coupling. As the motor transfers a torque of a certain size, one shaft rotates at a corresponding speed. Since this is coupled to the magnetic coupling, this and the other shaft will rotate at the same speed so that the drive unit is driven.
    If the motor transmits a torque exceeding the decoupling torque (for example, if the shaft rotates faster than a certain angular velocity), the magnetic clutch will not be able to rotate the shaft to the drive unit, as the attractiveness of the two magnetic units will not be large enough to hold them.
    The shaft connected to the motor and the clutch will therefore rotate, while the shaft connected to the drive unit and the magnetic clutch will not be able to rotate, so the drive unit will be disconnected. This ensures that the drive unit is not overloaded, e.g. in the event that the motor transmits a greater torque than the shutdown torque - for example, if the motor behaves unintentionally.
    The drive unit can be any device to be driven by a motor, for example a pump.
    The magnetic coupling is axially oriented and extends parallel to the shafts that the magnetic coupling joins. The magnetic coupling may have different lengths depending on which application the magnetic coupling is to be used within.
    The magnetic coupling comprises two cylindrical magnet units. One cylindrical magnet unit is located concentrically in the second cylindrical magnet unit so that the second cylindrical magnet unit surrounds the first cylindrical magnet unit. Both cylindrical magnet units can rotate relative to each other. The two cylindrical magnet units are arranged so that they attract each other, ie. that one magnet unit has a south pole against the other magnet's north pole or vice versa.
    However, the magnetic unit may also be constructed such that the magnetic unit consists of a number of smaller magnets which are attached to the magnet unit, so that there are alternately magnets having south pole and north pole.
    The magnet (s) located on the innermost cylindrical magnet assembly may be mechanically locked by a geometric lock or by another fastener. This ensures that the magnets can not detach if the coupling is affected by an extreme load and vibration.
    The two cylindrical magnet members may be coated and may be positioned so as to be in contact with each other. It is possible to provide a radial separation between the magnetic units.
    It may be advantageous for the magnetic coupling to comprise one or more gaskets which prevent particles from contacting the magnetic units or the bearings of the magnetic coupling.
    The magnetic coupling consists of an outer sheath which can be produced in steel, e.g. in stainless steel. The entire magnetic coupling, ie. all the steel parts as well as the magnets can be treated with sol-gel, so that the coupling can avoid corrosion and that the coupling can be immersed in different liquids or other aggressive environments.
    The sun gel can be flexible so that it can still protect the metal surface in the event that the surface gets a scratch.
    For best anti-corrosion protection, it is preferred that the layer has a predefined minimum thickness.
    It may be convenient that the sol-gel layer is at least 3 µm, preferably between 3-20 µm and most preferably 3-10 µm.
    The magnetic coupling comprises a first end which can be attached to a first shaft. The magnetic coupling comprises a second end which can be attached to another shaft. The two shafts can be attached to the magnetic coupling using the same method or using different fastening methods. For example, at one end of the magnetic coupling may be provided a carrier profile into which the shaft can be inserted so that the shaft is locked inside the end of the magnetic coupling. At the other end of the magnetic coupling, at least one profile corresponding to the carrier profile of the shaft may be provided, thereby providing a simple and reliable mechanical fastening.
    It is possible to provide teeth at both ends of the magnetic coupling. The two ends may have the same number of teeth, but may also have different numbers of teeth, so that both shafts must be connected to the coupling via attachment via the teeth.
    Advantageously, the mechanical mechanism may comprise an adjusting screw fixed to the inner member and may adjust the position of the second cylindrical magnet unit axially along the center axis of the magnetic coupling so that the two cylindrical magnet units may be positioned opposite each other or partially opposite each other with varying overlaps.
    By means of the adjusting screw it is possible to manually adjust the clutch so that it can be used for several different drive units having different maximum loads, the adjusting screw can be adjusted so that it can move one magnet axially along the inner part and thereby change the coupling moment of the magnetic clutch.
    Figure Description
    The invention will be explained in the following with reference to the accompanying drawings, in which
    FIG. 1a) shows a schematic cross-sectional view of a magnetic coupling according to the invention,
    FIG. 1b) shows a side view of a magnetic cube according to the invention,
    FIG. 2 is a schematic illustration of the cross section of a magnetic cube according to the invention;
    FIG. 3a) shows a schematic illustration of the cross-section of a magnetic cube according to the invention,
    FIG. 3b) shows the magnetic coupling shown in FIG. 3a) from above;
    FIG. 3c) shows a perspective view of the magnetic coupling shown in FIG. 3a) and FIG. 3b) side view,
    FIG. 4a) shows a cross-sectional view of an embodiment of the invention,
    FIG. 4b) is a side view of a schematic illustration of a magnetic cube according to the invention;
    FIG. 4c) shows a cross-sectional view of another embodiment of the invention,
    FIG. 4d) shows a schematic illustration of a magnetic cube according to the invention from above; 5 is a schematic representation of a conventional system showing a motor driving a drive via a magnetic cube.
    Detailed description
    Initially, it should be noted that the attached drawings illustrate non-limiting embodiments only. A variety of other embodiments will be possible within the scope of the present invention. In the following, similar or identical elements in the various embodiments will be denoted by the same reference numeral.
    FIG. 1 shows a cross-sectional view of a magnetic coupling 2 according to the invention. The magnetic coupling 2 is symmetrical about its longitudinal axis X. The magnetic coupling 2 comprises two cylindrical magnetic units 6 and 3.
    The magnetic coupling 2 comprises a sheath 4 which encloses the inner parts of the magnetic coupling and protects them from impact and moisture. The magnetic units 6, 8 are cylindrical and are coated with a sun-gel coating for best anti-corrosion protection. It is preferred that the layer of sol-gel be at least 3 µm. The layer thickness can e.g. be 3-20 pm, including 3-10 pm.
    The sun-gel coating may advantageously be a sun-gel coating with dust-repellent properties. It may be advantageous that the sol-gel coating is cured at a suitable temperature which may depend on the temperature range within which the sol-gel is affected.
    The cylindrical magnet assembly 8 is concentrically disposed in the cylindrical magnet assembly 6 such that the cylindrical magnet assembly 6 surrounds the cylindrical magnet assembly 8.
    The inside of the cylindrical magnet assembly 6 and the outside of the cylindrical magnet assembly 8 may, under optimum conditions, be separated by a narrow gap so that there is no herring due to mechanical contact. The gap may be filled with a lubricating film or an air gap.
    The two cylindrical magnet units 6 and 8 are arranged so as to attract each other, ie. that one magnet unit has a south pole facing the north pole of the other magnet unit or vice versa.
    The magnetic coupling 2 comprises an outer sheath 4 which may be made of stainless steel. The sheath 4 encloses and protects one cylindrical magnet assembly 6. The sheath 4 is terminated with an end piece 10 attached to a bearing 12 and to the distal end of the sheath 4, the sheath 4 may advantageously be braced on the end piece 10. In the other At the end, the sheath 4 is housed in a bearing 14. This bearing 14 may be any type of bearing, e.g. a ball bearing. The magnetic coupling 2 comprises an inner part 16 which is housed in a bearing 12 which may be a ball bearing or a radial ceramic bearing of e.g. silicon carbide.
    The bearing 12 is disposed between the end piece 10 and the inner member 16. The inner member 16 has two levels of different thicknesses Ti and T2, with a first thickness Ti being significantly smaller than the second thickness T2. In addition, the inner portion 16 has a abutment unit comprising a first abutment surface 38 and a second abutment surface 39 extending radially outwardly at the proximal end of the wide portion of the inner portion 16 having the thickness T2. This abutment surface 38 is adapted for positioning the bearing 12 abutting the abutment surface 38.
    The magnetic coupling 2 comprises a first end 20 which is arranged for insertion of a first shaft which can be fastened using any mechanical fastener, e.g. a driver profile.
    The magnetic coupling 2 comprises a second end 22 which is arranged for insertion of a second shaft. At the end 22, two teeth 40, 42 are provided which extend axially along the longitudinal axis X of the magnetic coupling. It is intended that the two teeth 40, 42 fit into the shaft to be inserted at the other end 22 so that shaft is attached to the magnetic coupling 2 via the two teeth 40, 42.
    The magnetic coupling 2 comprises a mechanically adjustable mechanism 18 comprising an adjusting screw 18 which displaces the first cylindrical magnet unit 6 axially relative to the second cylindrical magnet unit 8. This adjustment can be carried out with a thread located on the inner part. A corresponding rotatably fastened nut may be provided which, by rotation, displaces the inner portion relative to ten. the outer part. the adjusting screw 18 is attached to the inner part 16 and can adjust the position of the second cylindrical magnet unit 8 so that the overlap between the two cylindrical magnet units 6 and 8 can be varied. When the two cylindrical magnet units 6 and 8 overlap each other maximally, the cylindrical magnet unit 8 is positioned so that it abuts against the abutment surface 39 of the abutment unit.
    FIG. 1 b) shows the side view of the magnetic coupling 2 shown in Fig. 1 a). It is seen that the magnetic coupling 2 is symmetrical about its longitudinal axis X and that the inner part 16 protrudes upwards, but the tooth 40 protrudes downwards.
    FIG. 2 illustrates a cross-sectional view of a magnetic coupling 2 according to the invention. The magnetic coupling 2 is symmetrical about its longitudinal axis X, The magnetic coupling 2 comprises two cylindrical magnetic units 6 and 8 surrounded by a sheath 4. The cylindrical magnetic units 6, 8 may be coated with a sun-gel coating to obtain the best corrosion-resistant protection.
    It is an advantage if the layer of sol-gel 3 pm or more. The outer cylindrical magnet assembly 6 is positioned concentrically around the cylindrical magnet assembly 8 such that the cylindrical magnet assembly 6 surrounds the cylindrical magnet assembly 8.
    The two cylindrical magnet units 6 and 8 are arranged so as to attract each other via magnetic attraction between the adjacent surfaces. This is provided by orienting the magnetic units 6, 8 with divergent adjacent polarity, so that one magnetic unit north pole abuts the south pole of the other magnet unit.
    The magnetic coupling 2 comprises outer steel sheath 4 to which the outer magnetic unit 6 is attached. The sheath 4 is at least at one end braced on an end piece 10 housed in a bearing 12 rotatably disposed about an inner portion 16. At the opposite end of the sheath 4, another bearing 14 is attached to the distal and narrow end of inner portion 16,
    The inner portion 16 comprises a thick portion having the thickness T2 and a narrow portion having a significantly smaller thickness Ti. The inner portion 16 comprises a abutment unit comprising a first abutment surface 38 and a second abutment surface 39 extending radially outwardly at the proximal end of the wide portion of the inner portion 16 having the thickness T2. This abutment surface 38 abuts the bearing 12.
    The magnetic coupling 2 comprises a first end 20 and a second end 22, the first end 20 arranged for insertion of a first shaft, while the second end 22 is arranged for insertion of a second shaft. At the end 22 two teeth 40 are provided. 42 extending axially along the longitudinal axis X of the magnetic coupling. These two teeth 40, 42 are configured to engage corresponding grooves in the shaft to be inserted at the other end 22 so that this shaft is secured to the magnetic coupling 2 by engagement with the two teeth 40, 42.
    Fig. 3 a) illustrates a cross-sectional view of a magnetic coupling according to the invention. The magnetic coupling 2 comprises two cylindrical magnet units 6 and 8 surrounded by a surrounding sheath 4. The cylindrical magnetic units 6, 8 may advantageously be coated with a sun-gel coating to obtain anti-corrosion protection. The layer of sol-gel should have a minimum size of e.g. 3 pm.
    The cylindrical magnet units 6, 8 are arranged concentrically so that the cylindrical magnet unit 6 surrounds the cylindrical magnet unit 8, The inside of the cylindrical magnet unit 6 and the outside of the cylindrical magnet unit 8 attract each other via magnetic attraction between the adjacent surfaces having different polarity thus , that the south pole faces the north pole.
    The mains connector 2 comprises an outer sheath 4 which is attached to the outer magnetic unit 6. To both the magnetic unit 6 and the sheath 4 is attached an end piece 10, which is secured via an angled edge 24, 26. At the other end there is arranged a bearing 14, wherein the inner part 16 is mounted,
    FIG. 3 b) illustrates that in FIG. 3 a) Magnetic coupling 2 shown from above, It can be seen that the magnetic coupling 2 comprises an outer sheath 4 and that a carrier profile 28 is provided in the form of an axially extending groove 28 of rectangular cross section. This track 28 is configured to engage a shaft provided with a profile that fits into the track 28,
    FIG. 3 c) illustrates a perspective view of the one shown in FIG. 3 a) and in FIG. 3 b) the magnetic coupling 2 shown obliquely from above. It is seen that the inner part 16 extends further axially upwardly than both the ball bearing 12 and the end piece 10, which are attached to the surrounding sheath 4. In the inner part 16 it is seen that the groove 28 extends axially.
    FIG. 4 a) shows a cross sectional view of a magnetic coupling 2 according to the invention similar to that of FIG. 1, the length of the magnetic coupling 2 is indicated in FIG. 4 a).
    FIG. 4 b) illustrates the magnetic coupling 2 shown in FIG. 4 a) Side view.
    FIG. 4 c) shows a cross-sectional view of a magnetic coupling 2 according to the invention similar to that of FIG. 2 the length d of the magnetic coupling 2 is indicated in FIG. 4 c). It will be seen that the length d 1 of the magnetic coupling 2 is significantly smaller than the length d 1 of the magnetic coupling shown in Figs. 4 a).
    FIG. 4 d) illustrates the magnetic coupling 2 shown in FIG. 4 c) seen from above (where the end 20 faces upwards). This view is similar to that of FIG. 3 b).
    FIG. 5 shows a schematic illustration of a conventional system employing a magnetic coupling 2. The system comprises a motor 30 configured for 10. driving a drive unit 32, the motor 30 and the drive unit 32 are connected via a first shaft 34 and a second axis! 36, which are coupled together in the magnetic coupling 2.
    As the motor 30 rotates the first shaft 34 and transmits a torque that does not exceed the disconnect torque, the magnetic clutch 2 transmits the torque from the motor 30. The first shaft 34 will rotate at the same speed as the second shaft 36, causing the drive unit 32 to be driven.
    If the motor 30 delivers greater torque than intended (and, for example, rotates faster than intended), the magnetic coupling 2 will disengage, since the magnetic attraction between the two magnetic units of the magnetic coupling will not be large enough to keep the two magnetic units of the coupling connected. Therefore, the shaft 36 will not rotate and the drive unit 32 will be protected against overload. The mains connection 2 ensures that the drive unit 32 is not overloaded in the case where the motor 30 does not work properly.
    Reference number 2 - Magnetic coupling 4 - Sheath 6 - Magnetic unit 8 - Magnetic unit 10 - End piece 12 - Bearing 14 - Bearing 16 - Inner part
    Ti, T2 - Thickness di, d2 - Length 18 - Adjustment screw 20 - First end 22 - Second end 24, 26 - Bertlet edge 28 - Carrier profile 30 - Engine X - Longitudinal axis 32 - Drive unit 34, 36 - Shaft 38, 39 - Touch surface 40 , 42 - Tooth
    权利要求:
    Claims (10)
    [1]
    A magnetic coupling (2) comprising a first cylindrical magnetic unit (6) and a concentrically disposed second cylindrical magnetic unit (8), wherein the second cylindrical magnetic unit (8) is rotatably arranged in the first cylindrical magnetic unit (6), wherein the magnetic coupling (2) ) comprises an inner portion (16) housed in a first bearing (12), wherein the magnetic coupling (2) comprises an outer portion (4) housed in a second bearing (14), wherein the magnetic coupling (2) comprises a first end (20) arranged for attaching a first shaft (34) wherein the magnetic coupling (2) comprises a second end (22) arranged for securing a second shaft (36), characterized in that the magnetic coupling (2) comprises a mechanically adjustable mechanism which displaces the first cylindrical magnet assembly (6) axially with respect to the second cylindrical magnet assembly (8).
    [2]
    A magnetic cube (2) according to claim 1, characterized in that the mechanical adjustable mechanism comprises an adjusting unit comprising a screw device (18), said screw device (18) adapted to displace the first cylindrical magnetic unit (6). axially relative to the second cylindrical magnet assembly (8).
    [3]
    A magnetic coupling (2) according to claim 1 or claim 2, characterized in that the first bearing (12) and / or the second bearing (14) is a ball bearing.
    [4]
    A magnetic coupling (2) according to one of the preceding claims, characterized in that a first sheath (4) is arranged around the first cylindrical magnetic unit (6).
    [5]
    A magnetic coupling (2) according to one of the preceding claims, characterized in that the magnetic coupling (2) comprises an end piece (10) and a steel sheath (4) and that the styling sheath (4) is at least one end of the end piece (10)
    [6]
    A magnetic coupling (2) according to claim 5, characterized in that a ball bearing (12) is arranged between the end piece (10) and the inner part (16).
    [7]
    A magnetic coupling according to one of the preceding claims, characterized in that the inner part (16) comprises a first narrow region of a first thickness (Ti) which is significantly narrower than a second wide region of thickness (T2).
    [8]
    A magnetic coupling (2) according to claim 7, characterized in that the inner part (16) comprises a abutment unit (38, 39) extending radially outwards with respect to the narrow region of a first thickness (Ti).
    [9]
    A magnetic coupling (2) according to one of the preceding claims, characterized in that the outer part (4) and / or the magnetic units (6, 8) are coated with a sol-gel coating.
    [10]
    A magnetic coupling (2) according to claim 9, characterized in that the sol-gel coating has a minimum thickness of 3 µm.
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    同族专利:
    公开号 | 公开日
    DK178394B1|2016-02-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4408719C1|1994-03-15|1995-07-06|Volkswagen Ag|Combined electric generator and motor for vehicle hybrid drive|
    US6841909B2|2002-08-01|2005-01-11|Albert Six|Magnetic drive system|
    US6762524B2|2002-08-01|2004-07-13|Albert Six|Magnetic drive system for a vehicle differential|
    JP5231498B2|2009-10-19|2013-07-10|株式会社キトー|Torque transmission device|
    US9334905B2|2012-04-16|2016-05-10|GM Global Technology Operations LLC|Hybrid coded magnets and SMA positive drive clutch|
    法律状态:
    2017-10-23| PBP| Patent lapsed|Effective date: 20170331 |
    优先权:
    申请号 | 申请日 | 专利标题
    DK201400164|2014-03-21|
    DK201400164A|DK178394B1|2014-03-21|2014-03-21|Magnetic coupling|DK201400164A| DK178394B1|2014-03-21|2014-03-21|Magnetic coupling|
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