巴西专利BR112013018579B1 rotor for rotational electric machine

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专利摘要:
ROTOR FOR ROTATIONAL ELECTRICAL MACHINE Rotor (10) designed for a rotational electrical machine with a plurality of magnetic poles (24) provided at intervals, in a circumferential direction, close to the outer periphery of a rotor core (12). Each of the magnetic poles (24) has a first permanent magnet (26) grounded in the center of the magnetic pole, and a pair of second permanent magnets (28) that are enclosed on both sides of the first permanent magnet (26) in the circumferential direction, being arranged in such a way that a mutual spacing between the pair of the second permanent magnets (28) becomes narrower internally in the radial direction. A narrower spacing between the pair of second permanent magnets (28) is adjusted to be wider than a width in the longitudinal direction of the first permanent magnet (26) in the second magnetic path region (3) defined by the first permanent magnet ( 26) and for the second pair of permanent magnets (28).
公开号:BR112013018579B1
申请号:R112013018579-1
申请日:2012-02-02
公开日:2021-02-23
发明作者:Shinya Sano；Ken Takeda；Tomohiro Inagaki；Shinichi Otake；Tsuyoshi Miyaji；Yuta WATANABE；Ryosuke Utaka
申请人:Toyota Jidosha Kabushiki Kaisha；
IPC主号:

专利说明:

Fundamentals of the Invention: 1. Field of the Invention:
[001] The invention relates to a rotor intended for a rotating electric machine, and more particularly, a rotor for a rotating electric machine where a plurality of magnetic poles are positioned at intervals, in a circumferential direction, close to a periphery outer part of a rotor core. 2. Description of the Related Technique:
[002] Published Japanese Patent Application No. 2008-306849 (JP-A-2008- 306849) describes, for example, an electric rotational machine incorporating a stator where the stator coil is wrapped around a portion the inner periphery, containing a built-in permanent magnet type rotor provided to rotate in the stator. The aforementioned rotor is formed from a rotational mechanical axis and a cylindrical core housing attached to the rotational mechanical axis.
[003] The core housing above results from an integrated construction, whether by means of wrinkling or the like, a pile of magnetic steel sheets in the axial direction, each of which formed through perforation, in a shape configuration circular ring. There is the provision of a plurality of magnetic poles, equally spaced in a circumferential direction, close to the outer periphery of the core housing. FIG. 8 illustrates a magnetic pole in a condition seen from a gasket at the end of the axial direction. FIG. 8 illustrates a magnetic pole 104, together with part of a stator 106, from a group of components disposed with uniform spacing near the outer periphery of the core housing 102 of the rotor 100 (at 45 ° angle intervals, so as to that the central axis of a rotational mechanical axis is at the center of each ventilation setting).
[004] Provision is made for a plurality of teeth 108 pointing inwardly in a radial direction, with identical spacing in the circumferential direction, on the internal periphery of stator 106. Slits 108 are formed, respectively, in an amount identical to that of the teeth 106, between mutually adjacent teeth, so that the slits 108 are open on the inner peripheral side and on both end portions in the axial direction. A stator coil (not shown) that is wrapped around the teeth 106 is inserted into the slots 108. As a result, a rotational magnetic field is formed on the internal peripheral side of the stator 100 when the coil the stator is energized.
[005] Each magnetic pole 104 provided in the housing of the core 102 of the rotor 100 is configured containing three permanent magnets, namely the permanent magnets 112, 114, 116. The permanent magnet 112 disposed in the center of the circumferential direction of the magnetic pole 104 is grounded in the vicinity of an outer peripheral seal 103 of the core housing 102. The permanent magnet 112 has end fittings and a cross section exhibiting an elongated rectangular shape, being formed substantially the same length in the axial direction as that of the core housing 102 The permanent magnet 112 is arranged in such a way that its longitudinal direction, next to the end cap of the magnet, comes to function substantially along the outer peripheral seal 103 of the core housing 102, still having a width W in the longitudinal direction.
[006] The other two permanent magnets 114, 116 are arranged symmetrically on both sides of the permanent magnets 112, in the circumferential direction, so that the two permanent magnets 114, 116 form a V shape that extends towards the outer periphery. in other words, the permanent magnets 114, 116 are arranged in such a way that the distance or mutual spacing will narrow and narrow towards the inner periphery, and the spacing in the end portions between the side and periphery of the permanent magnets 114, 1116, where the mutual spacing is narrower, it becomes even narrower than the width W in the longitudinal direction. At the magnetic pole 102, it results that a region of substantially triangular magnetic path 118 comes to be formed or defined by the three permanent magnets 112, 114, 116. Both end portions of the region of magnetic path 118, in the circumferential direction are connected to the outer peripheral seal 103 of the core housing 102 via the regions between the permanent magnet 112, and the permanent magnets 114, 116.
[007] Document JP-A-2008-306849 indicates that in a rotational electrical machine containing a rotor 100 having the above configuration, it becomes possible to reduce an electromotive force contrary to a particular order generated by operating the rotational electric machine, also reducing noise, by adjusting a pre-defined angle, with the intersection angle defined by the virtual straight lines that connect the end portions in the circumferential direction of the permanent magnets 114, 116 and the part center of the rotational mechanical axis, and a virtual reference line perpendicular to a straight line in the radial direction acting in the central part of the circumferential direction of the permanent magnet 112.
[008] In the rotational electric machine pertinent to document JP-A-2008- 306849, the flow of the magnetic flux, such as those illustrated in FIGS. 9A to 9C, is formed at the magnetic pole 104 of the core housing 102 of the rotor 100 through the rotational transmission of the rotor 100 as a result of the current passing through the stator coil. FIG. 9A schematically illustrates the flow of the magnetic flux (hereinafter, magnetic flux of the magnet), generated by the permanent magnet 114 towards the outer periphery through a region of magnetic path 118. FIG. 9B schematically illustrates the way in which the magnetic flux, generated by the current component on the q-axis, obtained by resolving the vector representative of the electric current flowing through the stator coil, in a dq plane, representing a system of Cartesian coordinates (hereinafter, magnetic current flow on the q-axis or magnetic current flow of excitation), flows from the end portions of the inner periphery of the teeth 108 of the stator 106 within the core housing 102 and transverse the magnetic path region 118 of the magnetic pole 104. FIG. 9C schematically illustrates the flow of the magnetic flux resulting from the combination of the magnetic flux mentioned above and the magnetic flux of the current on the q-axis mentioned above.
[009] Referring to FIG. 9A, the magnetic flux of the magnet generated by the permanent magnet 114 is directed towards the outer peripheral seal 103 of the core housing 102. Part of the magnetic flux from the permanent magnet 114 is directed towards the outer peripheral seal, through the permanent magnet 112 However, the permanent magnet 112 that is grounded in the core housing 102 has a magnetizing resistance or relative permeability equivalent to that of a void, and therefore, most of the magnetic flux flows towards the outer peripheral seal, through the region the end portion of the circumferential direction of the region of magnetic path 118, consisting of a portion of steel plate having low magnet strength. Referring to FIG. 9B, the magnetic flux of the current on the q-axis that flows towards the magnetic pole 104 in the core housing 102 is likewise directed towards the outer peripheral lining, by means of substantial flow along a circular arc through the region magnetic path 118 showing low resistance to magnetization.
[010] Consequently, by overlapping the magnetic flux of the magnet and the magnetic flux of the current on the q-axis flowing according to the description given above, the density of the resulting magnetic flux increases next to the substantially triangular downstream region 120, indicated by dashed portion within the magnetic path region 118, according to the illustration given by FIG. 9C, with the result that magnetic saturation is very likely to occur. This in turn can result in a weaker torque of the rotational electrical machine.
[011] In FIG. 9A, the magnetic flux generated by the permanent magnet 116 is not shown. However, the magnetic flux from the permanent magnet 116 also flows towards the region downstream 120 mentioned above, thus increasing the possibility of magnetic saturation, such as the type previously described. If the flow direction of the magnetic flow in the region of magnetic path 118 is reversed, the occurrence of magnetic saturation, according to the description above, will most likely occur in a region positioned between the permanent magnet 116 and the permanent magnet 112, within the region of magnetic path 118.
[012] JP 2006 314152 A discloses a rotor including a plurality of magnetic poles supplied in intervals. In a circumferential direction of the rotor core, at an outer periphery of the rotor core, each of the magnetic poles has a first permanent magnet and a pair of second permanent magnets that are grounded on both sides of the first permanent magnet. The narrower space between the pair of second permanent magnets is wider than the width of the first permanent magnet in a direction perpendicular to the radial direction in a region of magnetic path.
[013] JP 2006 311772 A, EP 0 889 574 A1 and US 2007/096 579 A1 describe rotors having a first magnet and a pair of second magnets. The narrower space between the pair of second permanent magnets is wider than the width of the first permanent magnet.
[014] US 2006/290221 A1 describes a rotor having a first magnet in a circumferential direction from the rotor core and a pair of magnets that are grounded on both sides of the first magnet. Summary of the Invention:
[015] The invention provides a rotor for a rotational electric machine, where each of the magnetic poles includes at least three permanent magnets, and from each of which it is possible to intensify the torque of the rotational electric machine.
[016] A rotor for a rotational electrical machine according to an aspect of the invention includes: a rotor core having a plurality of magnetic poles provided at intervals, in the circumferential direction of the rotor core, near an outer periphery of the rotor core , each of the magnetic poles featuring a first permanent magnet grounded in the central part of the magnetic pole, in the circumferential direction, and a pair of second permanent magnets that are enclosed on both sides of the first permanent magnet, in the circumferential direction, being arranged in such a way that the mutual spacing between the pair of second permanent magnets will become narrower in the direction of a radial direction of the rotor core, and this narrower spacing between the pair of second permanent magnets will be adjusted to be wider than that the width of the first permanent magnet in a direction perpendicular to that of the radial direction in a region of magnetic path formed around the first permanent magnet and the pair of second permanent magnets, as observed along an axial direction of the rotor core.
[017] In the rotor intended for a rotational electric machine, according to one aspect of the invention, it is clear that each first permanent magnet and the pair of second permanent magnets can have a flat shape, and the direction perpendicular to the radial direction can represent a longitudinal direction of the first magnetic magnet.
[018] In the rotor intended for a rotational electric machine, according to one aspect of the invention, one has a cross section, perpendicular to the axial direction of the rotor core, of each first permanent magnet and the pair of second permanent magnets, may have an elongated rectangular shape.
[019] In the rotor intended for a rotational electric machine, according to one aspect of the invention, each of the magnetic poles may also have an orifice for the elimination of magnetic flux that is formed next to an opposite position to that of the first permanent magnet, through the region of magnetic path, in the end portions between the lateral and the periphery, in the radial direction, of the pair of second permanent magnets.
[020] In the rotor intended for a rotational electric machine, according to one aspect of the invention, the magnetic flux elimination hole can have two holes communicating with the lateral end and inner periphery portions of the second magnet insertion holes. where the pair of second permanent magnets comes to be inserted, respectively, and a second hole that comes to be formed between the first of the holes containing the bridge portions interposed between the second hole and the first of the holes; and at least one between the first and the second orifices may include at least one void or a resin having a lower relative permeability than that relating to the magnetic material that forms the rotor core.
[021] In the rotor intended for a rotational electric machine, according to one aspect of the invention, the first permanent magnet can have two permanent magnets that are positioned next to each other forming a substantial V-shaped configuration that widens in direction the outer periphery in the radial direction.
[022] In the rotor intended for a rotational electric machine, according to one aspect of the invention, each of the magnets in the pair of second permanent magnets may have two permanent magnets arranged next to each other in order to form a configuration substantially in V shape that extends towards the first permanent magnet,
[023] In the rotor intended for a rotational electric machine, according to one aspect of the invention, a longitudinal direction of each pair of second permanent magnets can come to be arranged substantially along the radial direction.
[024] In the rotor intended for a rotational electric machine, according to one aspect of the invention, a positioning of the first permanent magnet in the radial direction can be substantially identical to a positioning, in the radial direction, of the end portions between the side and the outer periphery of the pair of second permanent magnets in the radial direction.
[025] In the rotor intended for a rotational electric machine, according to one aspect of the invention, each of the magnetic poles has a first magnetic flux elimination orifice, being formed in an opposite position to that of the first permanent magnet along the magnetic path region, between the lateral end portions and inner periphery, in the radial direction, of the pair of second permanent magnets, the first permanent magnet, the second permanent magnets and the first magnetic flux elimination hole defining the path region magnetic as the first magnetic path region; in each of the magnetic poles, there is the formation of a second magnetic path region on the inner peripheral side of the first magnetic path region containing the first magnetic flux elimination orifice interposed between the first magnetic path region and the second region magnetic path; each of the magnetic poles also has a pair of third permanent magnets enclosed on both sides of the pair of second permanent magnets in the circumferential direction, and arranged so that the mutual spacing between the pair of third permanent magnets is narrowing internally in the radial direction, and a second magnetic flux elimination orifice formed opposite the first magnetic flux elimination orifice along the second magnetic path region, at the end portions between the lateral and periphery in the radial direction, of the pair of third permanent magnets; the second magnetic path region being defined by the second and third permanent magnets, as well as the first and second magnetic flux elimination holes, in an inner peripheral side, in the radial direction, of the first magnetic path region; and in the second region of magnetic path, the narrower spacing between the pair of third permanent magnets is established to be equal to or greater than a width present between the edge portions, in the outer direction in the circumferential direction, of the pair of second permanent magnets , in a direction perpendicular to the radial direction.
[026] In the rotor intended for a rotational electric machine, according to one aspect of the invention, the first magnetic flux elimination orifice can have two first orifices communicating with the lateral end and inner periphery portions of the second insertion orifices. magnet. where the pair of second permanent magnets are respectively inserted, and a second orifice is formed between the first of the orifices containing portions of the bridge interposed between the second orifice and the first of the orifices; and at least one of the first and second holes may include at least one void or a resin having a lower relative permeability than that of a magnetic material forming the rotor core.
[027] In the rotor intended for a rotational electric machine, according to one aspect of the invention, the second magnetic flux elimination orifice can have two third orifices communicating with the end portions on the side and external periphery of the third orifices. insertion where the third pair of permanent magnets comes to be inserted, respectively, and a fourth hole that is formed between the third holes containing bridge portions interposed between the fourth and third holes; and at least one of the third and fourth holes may include at least one void or resin having a lower relative permeability than that pertaining to the magnetic material forming the rotor core.
[028] In the rotor intended for a rotational electric machine, according to one aspect of the invention, the first permanent magnet can have two permanent magnets that are arranged next to each other forming two permanent magnets that are arranged close together for the constitution of a substantial V-shaped configuration that extends towards an outer periphery in the radial direction.
[029] In the rotor intended for a rotational electric machine, according to one aspect of the invention, each of the pairs of the second permanent magnets can have two permanent magnets arranged next to each other in order to constitute a substantial V-shape that extends towards the first permanent magnet.
[030] In the rotor intended for a rotational electric machine, according to one aspect of the invention, each of the pairs of third permanent magnets may have two permanent magnets arranged close together so as to form a substantial V-shape that extends towards the first permanent magnet.
[031] In the rotor intended for a rotational electric machine, according to one aspect of the invention, the pair of third permanent magnets can have a flat shape.
[032] In the rotor intended for a rotational electric machine, according to one aspect of the invention, a cross section, perpendicular, the axial direction of the rotor core, of each of the pairs of the third permanent magnets, may have an elongated rectangular shape .
[033] In the rotor intended for a rotational electric machine, according to one aspect of the invention, a longitudinal direction of each of the pairs of the third permanent magnets can be arranged substantially along the radial direction.
[034] In the rotor intended for a rotational electric machine, according to one aspect of the invention, a positioning in the radial direction of the first permanent magnet, a positioning, in the radial direction, of the end portions of the lateral and outer periphery of the pair of seconds permanent magnets in the radial direction, and a positioning, in the radial direction, of the end portions of the lateral and outer periphery of the pair of third permanent magnets in the radial direction, can be substantially identical to each other.
[035] The rotor intended for a rotational electric machine, according to the invention, allows the fixation of a wide region of magnetic path that comes to be formed between the first and the second permanent magnets. This makes it possible to facilitate magnetic saturation in the region of the magnetic path. In addition, the magnetic flux flow is eliminated by the magnetic flux elimination orifice, which makes it possible to eliminate leaks from the magnetic flux coming from the first permanent magnet towards the inner periphery of the magnetic pole, while the magnetic flux coming from the second magnets permanently, the external peripheral seal of the magnetic pole is effectively flowed through the region of the magnetic path. It can be expected that the magnetic flux of the magnet at the magnetic pole will be further increased. The rotor intended for a rotational electric machine, according to the invention, described above, allows the intensification of torque to occur in a rotational electric machine equipped with the rotor described above. Brief Description of the Drawings:
[036] Below is a description of the aspects, advantages, and technical and industrial importance of the example modalities of the invention with reference to the accompanying drawings, where numerals indicate similar elements, being that: FIG. 1 consists of a longitudinal section diagram, taken along the axial direction, of a rotating electric machine provided with a rotor intended for a rotating electric machine (hereinafter referred to simply as a rotor), comprising an embodiment of the invention; FIG. 2 comprises from a partial enlarged view illustrating a magnetic pole of the rotor illustrated in FIG. 1, together with part of a stator; FIGS. 3A to 3C comprise diagrams schematically illustrating the flow of magnetic flux on a magnetic pole illustrated in FIG. 2, with FIG. 3A schematically illustrates the flow of the magnetic flux generated by one of the second permanent magnets towards the outer periphery through a region of magnetic path, with FIG. 3B schematically illustrating the magnetic flow of excitation current flowing from a stator to a rotor, through a magnetic path region on a magnetic pole, while FIG. 3C schematically illustrates the flow of the magnetic flux resulting from the combination of a magnetic flux of magnet and the magnetic flux of the excitation current; FIG. 4 comprises a diagram, similar to that pertinent to that of FIG. 2, illustrating an example where a first permanent magnet next to a central part of a magnetic pole is divided into a plurality of permanent magnets; FIG. 5 consists of a diagram, similar to that pertinent to that of FIG. 2, illustrating an example where an external peripheral side gasket of a first permanent magnet next to a central part of a magnetic pole is constituted on a curved surface; FIG. 6 comprises a diagram, similar to FIG. 2, illustrating an example where a pair of second permanent magnets is arranged in an open configuration, substantially V-shaped, towards the first permanent magnet; FIG. 7 consists of a diagram, similar to that of FIG. 2, illustrating an example where the formation of a second region of magnetic path, along a side on the inner periphery of a first region of magnetic path, by a pair of third permanent magnets and a second orifice for eliminating magnetic flux ; FIG. 8 consists of a diagram similar to that of FIG. 2, illustrating a conventional example, where a magnetic pole includes three permanent magnets; and FIGS. 9A to 9C comprise of diagrams illustrating the flow of magnetic flux on a magnetic pole illustrated in FIG. 8, FIG. 9A schematically illustrates the flow of the magnet's magnetic flux generated by one of the permanent magnets, arranged in a substantial V-shaped configuration, towards the outer periphery through a magnetic path region, with FIG. 9B schematically illustrating the magnetic flow of excitation current flowing from a stator to a rotor, through a magnetic path region at the magnetic pole, while FIG. 9C schematically illustrates the magnetic flux flow resulting from the combination of a magnet magnetic flux and the excitation current magnetic flux. Detailed Description of the Modalities:
[037] The modalities of the invention are detailed below with reference to the accompanying drawings. In the explanation that follows, the specific shapes, materials, numerical values, directions and so on comprise mere examples to facilitate understanding of the invention, and can be modified accordingly depending on the intended application, purposes, specifications and things like that.
[038] FIG. 1 illustrates a longitudinal section along the axial direction of a rotational electric machine 1 provided containing a rotor 10 of the modality. FIG. 2 illustrates an enlarged view of a magnetic pole of the rotor 10 together with a part of the stator 2.
[039] The rotational electric machine 1 incorporates a tubular stator 2 and a rotor 10 made available rotationally inside the stator 2. There is provision for a plurality of teeth 3 pointing inwards in the radial direction, with identical spacing in the circumferential direction , on the internal periphery of the stator 2. Slits 4 are formed, respectively, in an amount identical to that of teeth 3, mutually between adjacent teeth 3, so that slits 4 are open on the side of the inner periphery and on both sides in the axial direction. A stator coil 5 wrapped around the teeth 3 is inserted into the slots 4. There is the formation of a rotational magnetic field formed on the side of the internal periphery of the stator 2, when the stator coil 5 is energized, so that the rotor 10 is driven rotationally by the magnetic field of rotation.
[040] The stator coil 5 that comes to be wrapped around the teeth 3 can comprise a coil with distributed winding being wrapped so as to cover a plurality of teeth 3, or it can consist of a coil of concentric windings, being wrapped around each of the teeth 3.
[041] The rotor 10 includes: a cylindrical rotor core 12 containing a hole in a mechanical axis 11 in the center of a radial direction; a mechanical axis 14 which is passed through the mechanical axis hole 11 of the rotor core 12 and secured; end plates 16 which are arranged in contact with the rotor core 12, at both ends of the latter, in the axial direction of the mechanical axis 12 (and that of the rotor core 12) represented by the arrow X; and a fixing member 18 that fixes the rotor core 12 and an end plate 16 on the mechanical shaft 14.
[042] The rotor core 12 is configured by stacking, in the axial direction, multiple magnetic steel sheets that are formed each through drilling, in a circular ring shape, for example, silicone steel sheets with thicknesses of 0.3 mm or something like that. The magnetic steel sheets that occupy the core of the rotor 12 are integrally connected to each other through methods that involve the wrinkling, agglutination, welding or the like, of all the sheets, collectively or through the division of the rotor core 12 in a plurality of blocks in the axial direction. There is a provision for a plurality of magnetic poles with equal spacing in the circumferential direction, in the rotor core 12. According to the description provided below, each magnetic pole has a plurality of permanent magnets and a magnetic flux elimination orifice.
[043] The mechanical shaft 14 is formed from a round steel bar. A flange section 15 is formed on the outer periphery of the mechanical axis 12, so that the flange section 15 projects outwardly in the radial direction. The flange section acts as a stop element determining the position in the axial direction of the rotor core 12 on the mechanical shaft 14, through confinement against the end plate 16 during installation of the rotor 10. The rotor core 12 is fixed close to the mechanical axis 14 by means of an interference adjustment template. Alternatively, the positioning of the circumferential direction of the rotor core 12 is fixed with respect to the mechanical axis 14 through a key adjustment template, provided prominently next to a rim portion of the mechanical axis hole 11, at an entrance to the key on the mechanical shaft 14.
[044] Each end plate 16 comes to be formed as a disk containing substantially the same configuration as the end fittings in the axial direction of the rotor core 12. More preferably, the end plates 16 are formed from a non-metallic material -magnetic, for example, aluminum, copper or the like. A non-magnetic metallic material is used in this case for the purpose of eliminating short-circuits of the magnetic flux in the end portions in the axial direction of the permanent magnets that constitute the magnetic poles. As long as the material comprises a non-magnetic material, the end plates 16 are not restricted to a metallic material, and can be formed from a resin material.
[045] The end plates 16 provided at both ends of the rotor core 12 in the axial direction, for example, have a function of pressing the rotor core 12 from both ends, in a function of correcting the lack of balance in the rotor 10 arising from the partial cut of the work after the installation of rotor 10, and with a function of preventing the permanent magnets constituting the magnetic poles from coming out of the rotor core 12 in the axial direction.
[046] In the embodiment in question, the end plates 16 are described and detailed in the figures as having substantially the same diameter as that of the rotor core 12. However, the diameter of the end plates 16 can be formed, for example, in smaller size, or the end plates 16 may be omitted, in order to cut costs, in a situation where, for example, the permanent magnets that make up the magnetic poles will be fixed inside the rotor core by means of a resin or something like that.
[047] The fastening component 18 has a pleated portion 20 of cylindrical shape, and a pressing portion 22 projecting outwardly in the radial direction from an end portion of the pleated portion 10. The fastening component 18 is fixed next to the mechanical shaft 14 by wrinkling the pleated portion 20 against the mechanical shaft 14, in a state where the rotor core 12 and two end plates 16 are pressed against the flange portion 15 by means of the pressing portion 22. It has it is noted that the rotor core 12 is fixed together with the end plates 16 next to the mechanical axis 14.
[048] Next, there is an explanation of a configuration regarding the magnetic pole 12 with reference to FIG. 2. FIG. 2 comprises a diagram illustrating a magnetic pole 24 in a state seen from the end seal in the axial direction of the rotor core 12, the cross section configurations being perpendicular to the axial direction of the rotor core 12 are identical those referring to the figure. The stator coil is not described in FIG. 2. In FIG. 2, the central line of the circumferential direction of the magnetic pole 24 is represented by a traced line C.
[049] Provision is made for a plurality of magnetic poles 24 equally spaced in the circumferential direction, on the outer periphery of the rotor core 12. In the modality in question, an example is illustrated with the provision of eight magnetic poles 24 in the rotor core 12. The magnetic poles 24 are provided in such a way that the respective centers of the magnetic poles are positioned every 45 ° in the circumferential direction, around the center comprising the positioning of the geometric axis of rotation of the mechanical axis 14. The poles magnets 24 are configured in a similar way, and therefore the configuration of a magnetic pole will be explained below.
[050] Each magnetic pole 24 has a first permanent magnet 26 grounded in the center of the magnetic pole in the circumferential direction; a pair of second permanent magnets 28 buried in both sides of the first permanent magnet 26, in the circumferential direction, and arranged in such a way that the mutual spacing would become narrower inward in the radial direction or towards the inner periphery; and a magnetic flux elimination orifice 32 is formed at the end portions between the side and the inner periphery of the second permanent magnet pair 28, in an opposite position from the first permanent magnet 26 through the magnetic path region 30.
[051] The first permanent magnet 26 is grounded inside the rotor core 12, in the vicinity of a gasket on the outer periphery 13. The first permanent magnet 26 has end gaskets in the axial direction (and a cross section perpendicular to the axial direction) ) of elongated rectangular configuration, incorporating two short sides and two long sides and being formed to have a length in the axial direction substantially identical to that of the rotor core 12. The permanent magnet 26 is arranged in a symmetrical in line position with respect to centerline C of the magnetic pole so that the side seals on the long side are perpendicular to the centerline C of the magnetic pole. At present, the first permanent magnet 26 has a width in the longitudinal direction W1 (i.e., the length in the lining of the long side), as seen from the end seals in the axial direction.
[052] The first permanent magnet 26 is inserted into a magnet insertion hole 34 that is formed, extending axially in the rotor core 12. The receptacle portions 36 are formed on both sides, in the circumferential direction of the orifice. magnet insertion 34, so that the receptacle portions 36 come into contact with the magnet insertion hole 34. For example, a thermoset resin injected via the receptacle portions 36 flows into the gap present between the first permanent magnet 26 and the inner wall trim of the magnet insertion hole 34, being cured for fixing the first permanent magnet 26 in the magnet insertion hole 34.
[053] The resin for fixing the magnet can be injected through any of the receptacle portions 36, and the remaining portions of the receptacle 36 can be left in the voids. In any case, the receptacle portions 36 have, on their internal parts, a resin or void having a permeability relatively lower than that of the magnetic steel plates that constitute the rotor core 12. Therefore, the receptacle portions 36 have the function of eliminating short-circuits of the magnetic flux at both ends of the first permanent magnet 26 in the circumferential direction.
[054] Similar to the first permanent magnet 26, each second permanent magnet 28 also incorporates end linings in the axial direction (and a cross section perpendicular to that of the axial direction) of elongated rectangular configuration, containing two short sides and two elongated sides and being formed so as to have a length in the axial direction substantially identical to that of the rotor core 12. The second permanent magnets 28 having the same shape and size as those of the first permanent magnet 26 can be used. Making use of the same permanent magnets in the first and second permanent magnets 26, 28 comprises a procedural advantage as it allows the reduction in costs incurred in the manufacture, control and so on of the permanent magnets. Needless to say, the shapes and sizes of the first permanent magnet 26 and the second permanent magnets 28 can be differentiated.
[055] The pair of second permanent magnets 28 at the magnetic poles 24 are inserted into the formed magnet insertion holes 38 extending in the axial direction, into the rotor core 12, and being fixed by a resin. The pair of second permanent magnets 28 are arranged, therefore, in such a way that the mutual spacing widens towards the outer periphery seal 13 of the rotor core 12. In other words, the pair of second permanent magnets 28 comes to be arranged in such a way that the mutual spacing becomes narrower towards the inner periphery, as described above. The side linings on the elongated side, constituting a longitudinal direction of the seconds of the permanent magnets 28, are arranged along substantially the radial direction. The pair of second permanent magnets 28 is arranged, according to an asymmetric alignment ratio, on both sides of the center line C of the magnetic pole in the circumferential direction. A spacing W2 between the end portions of the lateral and inner periphery of the pair of second permanent magnets 28 (that is, the distance in a direction perpendicular to the center line C of the magnetic pole) is adjusted to be wider than the width W1 in the longitudinal direction mentioned above of the first permanent magnet 26. In other words, the second permanent magnets 28 are arranged so as to be positioned beyond the external part in relation to the first permanent magnet 26 with respect to the center line C of the magnetic pole . In the modality in question, more specifically, the end portions of the lateral and inner periphery of the second permanent magnets 28 are positioned on the outside, in the circumferential direction of the tangential lines that touch the end portions in the circumferential direction of the first permanent magnet 26 and that are parallel to the center line C of the magnetic pole. That is, the distance from the center line C of the magnetic pole next to each end portion of the lateral and inner periphery of the second permanent magnets 28 (ie 1/2 of W2) comes to be adjusted to be equal or greater than the distance from the center line C of the magnetic pole next to each end portion in the longitudinal direction of the first permanent magnet 26 (ie 1/2 of W1).
[056] A receptacle portion 40 is formed by communicating with each magnet insertion hole 38 along the side of the outer periphery of each magnet insertion hole 38. Each receptacle portion 40 is formed by extending into the axial direction along the side gasket on the short side of each second permanent magnet 28. Each portion of receptacle 40 has a void or resin inside it with a relative permeability lower than that of magnetic steel sheets. Therefore, the receptacle portions 40 have the function of eliminating short-circuits of the magnetic flux next to the end portions on the side and outer periphery of the second permanent magnets. The resin for fixing the second permanent magnets 28 can be injected via the receptacle portions 40.
[057] The magnetic flux elimination orifice 32 is formed in a position (bottom in FIG. 2) close to the inner periphery, between the end portions of the inner periphery of the pair of second permanent magnets 28. The flux elimination orifice magnetic 32 is disposed opposite the first permanent magnet 26 along the region of magnetic path 30. The magnetic flux elimination orifice 32 has an emptiness inside it, showing a permeability relatively lower than that of magnetic steel sheets. Therefore, the magnetic flux elimination orifice 32 has the function of eliminating or modifying the magnetic flux flow generated by the permanent magnets 26, 28 and the magnetic flux flow that flows from the front ends close to the inner periphery of the teeth 3 of the stator 2 and which penetrate the magnetic path region 30 of the magnetic pole 24 of the rotor core 12.
[058] In the modality in question, the magnetic flux elimination hole 32 consists of two first holes 41, 42, and a second hole 44. The first holes 41, 42 are formed communicating with the end portions of the lateral and inner periphery of the magnet insertion holes 38 through which the second permanent magnets 28 are inserted. The first holes 41, 42 are formed so as to present a substantially triangular shape, next to the symmetrical positions on both sides of the line center C of the magnetic pole, The first holes 41, 42 have the function of eliminating short-circuits of magnetic flux next to the end portions towards the elongated side on the side of the inner periphery of the second permanent magnets 28. The resin for fixing the second permanent magnets 28 can be injected into the magnet insertion holes 38, with the first holes 41, 42. In this case, the first holes can be partial filled with the resin mentioned above. Similarly for the case of voids, the resin has a relatively low permeability, and therefore, the resin can act in the function of eliminating the flow of magnetic flux, according to the description given above,
[059] The second hole 44 is formed between the first holes 41, 42 containing bridge portions 46, which are stacked in the steel plate portions, interposed between the second hole 44 and the first holes 41, 42. The second hole 44 it is formed to present a substantially perpendicular shape that is symmetrical with respect to a center that is crossed by the central line C of the magnetic pole. The second orifice 44 is positioned opposite the gasket of the outer periphery 13 of the rotor core 12 through the region of magnetic path 30, next to a central position, in the circumferential direction, between the pair of second permanent magnets 28. The second orifice 44 presents also, inside, a void (or resin) containing a relative permeability lower than that referring to that of magnetic steel sheets. Therefore, the second orifice 44 has the function of eliminating the magnetic flux flow, as described above.
[060] In the modality in question, there is an explanation of an example in which the magnetic flux elimination orifice 32 is formed from three orifices 41, 42, 44, but this magnetic flux elimination orifice 32 does not remain restricted to them, and the configuration and number of holes can be varied. For example, the magnetic flow elimination hole 32 can be made from two holes formed on both sides of a bridge portion extending along the center line C of the magnetic pole, or it can be formed as a hole, without any bridge portion, or can be designed with four or more holes. The complete magnetic flux elimination orifice 32 can be filled with material having a relatively low permeability, for example, a resin or the like.
[061] At the magnetic pole 24, a stacked sheet steel portion surrounded by the first permanent magnet 26, the second permanent magnets 28 and the magnetic flux elimination orifice 32 are formed as the magnetic path region 30. In the modality in question , the spacing W2 between the lateral end portions and the inner periphery of the second permanent magnets 28 is adjusted to be wider than the width W1 in the longitudinal direction of the first permanent magnet 26; the magnetic path region 30 is surrounded by the first permanent magnet 26, with the pair of second permanent magnets 28 having a substantially trapezoidal shape. As a result, the core regions between the first permanent magnet 26 and the second permanent magnets 28 are wider than the magnetic path region of a conventional magnetic pole of the type of three permanent magnets, where the end portions of the lateral and inner periphery of the second permanent magnets 28 are arranged close to each other giving configuration to a V shape. The magnetic path region 30 presenting a substantially trapezoidal shape extends towards the outer periphery, on both end sides in the circumferential direction, and connects with the outer periphery gasket 13 of the rotor core 12.
[062] Next, an explanation of the magnetic flux flow at the magnetic pole 24 of the rotor 10 follows, showing the configuration described above. The flow of the magnetic flux as illustrated in FIGS. 3A to 3C is formed next to the magnetic pole 24 of the rotor 10 by means of the rotational transmission of the rotor 100 as a result of the current flow through the stator coil 5 of the stator 2.
[063] FIG. 3A schematically illustrates the flow of the magnetic magnet flux through one of the second permanent magnets 28 towards the outer periphery through the magnetic path region 30. FIG. 3B schematically illustrates the way in which the magnetic flux, which is generated by the current component on the q-axis obtained by resolving the representative vector of the electric current flowing through the stator coil in a dq plane comprising a Cartesian coordinate system, flows from the end portions of the inner periphery of the teeth 3 of the stator 2 to the rotor core 12 and passes through the magnetic path region 30 at the magnetic pole 24. FIG. 3C schematically illustrates the magnetic flux flow resulting from the combination of the magnetic flux mentioned above and the current magnetic flux on the q-axis mentioned above.
[064] Referring to FIG. 3A, the magnet magnetic flux generated by one of the second permanent magnets 28 is directed towards the outer periphery 13 of the rotor core 12, through the magnetic path region 30. Referring to FIG. 3B, the magnetic current flow on the q-axis flowing to the magnetic pole 24 in the rotor core 12 is likewise directed towards the outer periphery seal 13, flowing substantially along a circular arc, through the path region magnetic 30 incorporating low magnet resistance. By overlapping the magnet magnetic flux and the magnetic current flux on the q-axis that flows as described above, the density of the combined magnetic fluxes increases comparatively with the downstream region or in the output region 48, represented by the dashed portion in the interior of the magnetic path region 30 which is formed in a substantially trapezoidal shape, according to the illustration in FIG. 3C. However, a comparison with the dashed region 120 in FIG. 9C shows that the region where there is fear about an occurrence of magnetic saturation is now significantly smaller. It has to be said that the reluctance torque increases as well as an increase in the Lq inductance on the q-axis, through the increase of the magnet torque through the increase in the magnetic flux of the magnet at the magnetic pole 24. This allows the intensification to take place effectively of the total torque, consisting of the sum of the magnet torque and the reluctance torque, on the rotational electric machine 1 using the rotor 10.
[065] In the rotor 10 of the modality in question, the magnetic flux elimination orifice 32 provided on the side of the inner periphery of each magnetic pole 24 eliminates the magnetic flux flow. Therefore, it is possible to prevent the magnetic flux from the first permanent magnet 26 from leaking towards the inner periphery of the magnetic pole 24, and the magnetic flux from the second permanent magnets 28 from causing it to flow effectively towards the external periphery trim 13 of the magnetic pole 24 through the magnetic path region 30. it results in an increase in the magnetic flux of the magnet at the magnetic pole 24, which leads to an increase in the torque of the magnet, being possible to reduce the inductance Ld on the d-axis. In this way, it becomes possible to further accentuate the magnet torque and the redundancy torque in the rotational electrical machine 1 even more effectively by using the rotor 10.
[066] In the rotor 10 of the modality in question, the electrically motivated counter force generated in the stator coil 5 is made to present a substantially sinusoidal waveform, and a loss of iron due to the harmonic components of a particular order, in the force opposite electromotive, by means of a distributive arrangement, described above, of the first permanent magnet 26 in the central part of the magnetic pole 26, and of the pair of second permanent magnets 28 on both sides of the first permanent magnet 26, in the circumferential direction.
[067] A preferred embodiment has been explained above where the magnetic flux elimination orifice 32 is provided next to a position on the side of the inner periphery of the first permanent magnet 26, however the presence of a magnetic flux elimination orifice is not constitutes something essential to the invention, and can be omitted.
[068] The variations of rotor 10 of the above embodiment are explained below with reference to FIGS. from 4 to 7.
[069] FIG. 4 illustrates an example where the first permanent magnet 26 comes to be divided into a plurality of permanent magnets in the central part of the magnetic pole 24. In this example, the first two divided permanent magnets 26a, 26b are arranged in symmetrical positions along the center line C of the magnetic pole, the first permanent magnets 26a, 26b are close together and form a substantial V-shape that extends towards the outer periphery. Respectively, receptacle portions 36 for eliminating short circuits from the magnetic flux are provided between the first two permanent magnets 26a, 26b. In this case, the distance between the outer periphery corners of the first two permanent magnets 26a, 26b corresponds to the width W1 of the longitudinal direction of the first permanent magnet. The two magnetic flux elimination holes 36 present between the first permanent magnets 26a, 26b can communicate with each other to form a single orifice. Other characteristics are identical to those referring to the rotor 10 described above, similar and equal constituent elements are represented by means of similar reference numerals, omitting an explanation of the same.
[070] FIG. 5 illustrates an example where an outer peripheral side gasket of a first permanent magnet 26, close to the central part of the magnetic pole 24, consists of a curved surface incorporating a substantially circular arc shape. Thus, the shape of the end seal of the first permanent magnet does not need to be rectangular. The same is true of the second permanent magnets. Other characteristics are identical to those referring to the rotor 10 described above.
[071] FIG. 6 illustrates an example where a pair of second permanent magnets comes to be arranged under the open configuration in a substantial V shape towards the first permanent magnet 26. In this example, each magnet in the second permanent magnet pair 28 is constituted of two permanent magnets 28a, 28b arranged close to each other to form a substantial V-shape that extends towards the first permanent magnet 26. In this case the narrowest spacing between the second pair of permanent magnets 28 corresponds to the distance between the corners on the side of the inner periphery of the two of the second permanent magnets 28a, 28b which are respectively arranged on the side of the inner periphery. Other characteristics are identical to those described for the rotor 10 described above.
[072] FIG. 7 illustrates an example in which a plurality of regions of magnetic path on the q-axis are formed on a magnetic pole 24. In this example, the magnetic pole 24 further comprises: a pair of third permanent magnets 50, enclosed on both sides of the pair of second permanent magnets 26, in the circumferential direction, and arranged in such a way that the mutual spacing narrows inwards in the radial direction; and a second magnetic flux elimination orifice 52 formed opposite the first magnetic flux elimination orifice 32 through the magnetic path region 54, between the lateral end portions and the inner periphery of the pair of third permanent magnets 50. A second region magnetic path 54 is formed by means of pairs of seconds and third permanent magnets 28, 50, as well as by means of the first and second magnetic flux elimination holes 32, 52, on the side of the inner periphery of the path region magnetic 30 (first region of magnetic path). In this case, preferably, the narrower spacing between the pair of third permanent magnets 50 is adjusted to be equal to or greater than the width between the edge portions, on the outside in the circumferential direction, of the pair of second permanent magnets 28, in a direction perpendicular to the radial direction. Preferably, the shape, size, and arrangement and so on of the first permanent magnet 26, the pair of second permanent magnets 28, and the magnetic flux elimination orifice 32 are designed to be more compact than in the case of the rotor 10 described above, in order to minimize the widening of the magnetic pole 24 in the circumferential direction. Other characteristics are identical to those with reference to the rotor 10 described above.
[073] The invention has been described with reference to the example modalities for illustrative purposes only. It should be understood that the description is not intended to be exhaustive or to limit the format of the invention and that the invention can be adapted for application in other systems and types of applications. The scope of the invention encompasses several modifications and equivalent provisions that may come to be conceived by technical experts in the field.

权利要求:
Claims (12)
[0001]
1. Rotor intended for a rotational electrical machine comprising a rotor core (12) including a plurality of magnetic poles (24) provided at intervals, in a circumferential direction of the rotor core, next to an outer periphery of the rotor core, each one of the magnetic poles (24) includes a first permanent magnet (26; 26a; 26b; 26c) grounded in the center of the magnetic pole, in the circumferential direction, and a pair of second permanent magnets (28; 28a; 28b) that are grounded in both sides of the first permanent magnet (26; 26a; 26b; 26c), in the circumferential direction, and which are arranged in such a way that a mutual spacing between the pair of the second permanent magnets (28; 28a; 28b) narrows internally in a radial direction of the rotor core, CHARACTERIZED by the fact that the narrower spacing (w2) between the pair of second permanent magnets (28; 28a; 28b) is adjusted to be wider than the width (w1) of the first magnet permanent (26; 26a; 26b; 26 c) in a direction perpendicular to the radial direction in a region of magnetic path (30) formed surrounded by the first permanent magnet (26; 26a; 26b; 26c) and the pair of second permanent magnets (28; 28a; 28b), as seen along an axial direction of the rotor core, with each of the magnetic poles (24) having a first hole (32) for eliminating magnetic flux formed in an opposite position to the first permanent magnet (26; 26a; 26b; 26c) along the magnetic path region (30), between the lateral end portions and the inner periphery, in the radial direction, of the pair of seconds permanent magnets (28; 28a; 28b), the first permanent magnet (26; 26a; 26b; 26c), the second permanent magnets (28; 28a; 28b) and the first magnetic flow elimination hole (32) defining the first magnetic path region (30); at each of the magnetic poles, a second region of magnetic path (54) is formed on one side of the inner periphery, in the radial direction, of the first region of magnetic path (30) containing the first orifice (32) for eliminating magnetic flux interposed between the first magnetic path region (30) and the second magnetic path region (54); each of the magnetic poles further comprises a pair of third permanent magnets (50) grounded on both sides of the second permanent magnet pair (28; 28a; 28b) in the circumferential direction, and arranged so that a mutual spacing between the third pair permanent magnets (50) will become narrower internally, in the radial direction, and a second magnetic flow elimination hole (52) formed opposite the first magnetic flow elimination hole (32) along the second path region magnetic (54) between the end portions of the lateral and inner periphery, in the radial direction, of the pair of third permanent magnets (50); with the second magnetic path region (54) being defined by the second and third permanent magnets, as well as the first and second magnetic flux elimination holes, along one side of the inner periphery, in the radial direction, of the first magnetic path region ; and in the second magnetic path region (54), the narrower spacing between the pair of third permanent magnets (50) is adjusted to be equal to or greater than a width between the edge-out portions in the circumferential direction, of the pair of second permanent magnets (28; 28a; 28b), in a direction perpendicular to the radial direction.
[0002]
2. Rotor for the rotational electric machine, according to claim 1, CHARACTERIZED by the fact that each first permanent magnet (26; 26a; 26b; 26c) and the pair of second permanent magnets (28; 28a; 28b) have a shape plane, and the direction perpendicular to the radial direction is a longitudinal direction of the first permanent magnet (26; 26a; 26b; 26c).
[0003]
3. Rotor for the rotational electric machine, according to claim 1 or 2, CHARACTERIZED by the fact that a cross section, perpendicular to the axial direction of the rotor core, of each first permanent magnet (26; 26a; 26b; 26c) and the pair of second permanent magnets (28; 28a; 28b), have an elongated rectangular shape.
[0004]
4. Rotor for the rotational electric machine, according to any one of claims 1 to 3, CHARACTERIZED by the fact that the first orifice (32) for eliminating magnetic flux has two first orifices (41, 42) that communicate with the portions end of the side and inner periphery of the second of the magnet insertion holes (38) where the pair of second permanent magnets (28; 28a; 28b) are respectively inserted, and a second hole (44) is formed between the first holes (41, 42) containing first bridge portions (46) interposed between the second hole (44) and the first holes (41, 42); and at least one of the first and second holes (41, 42, 44) including at least one void or a resin having a relative permeability lower than that of the magnetic material that forms the core of the rotor.
[0005]
5. Rotor for the rotational electric machine, according to any one of claims 1 to 4, CHARACTERIZED by the fact that the second hole (52) for eliminating magnetic flux has two third holes that communicate with the end portions of the side and internal periphery of the third magnet insertion holes where the pair of third permanent magnets (50) are respectively inserted, with a fourth hole formed between the third holes containing second portions of bridge interposed between the fourth hole and the third holes; and at least one of the third and fourth holes including at least one void or a resin having a relative permeability lower than that of the magnetic material forming the rotor core.
[0006]
6. Rotor for the rotational electric machine, according to any one of claims 1 to 5, CHARACTERIZED by the fact that the first permanent magnet (26a; 26b) has two permanent magnets arranged next to each other, configuring a substantial widening V shape towards an outer periphery in the radial direction.
[0007]
7. Rotor for the rotational electric machine, according to any one of claims 1 to 6, CHARACTERIZED by the fact that each pair of second permanent magnets (28a, 28b) has two permanent magnets arranged next to each other in order to configure a substantial V-shape that extends towards the first permanent magnet.
[0008]
8. Rotor for the rotational electric machine, according to any one of claims 1 to 7, CHARACTERIZED by the fact that each pair of third permanent magnets (50) has two permanent magnets arranged next to each other in order to configure a substantial shape V widening towards the first permanent magnet.
[0009]
9. Rotor for the rotational electric machine, according to any one of claims 1 to 8, CHARACTERIZED by the fact that the pair of third permanent magnets (50) has a flat shape.
[0010]
10. Rotor intended for the rotational electric machine, according to any one of claims 1 to 9, CHARACTERIZED by the fact that the cross section, perpendicular to the axial direction of the rotor core, of each pair of third permanent magnets (50), has a elongated rectangular shape.
[0011]
11. Rotor for the rotational electric machine, according to any one of claims 1 to 10, CHARACTERIZED by the fact that a longitudinal direction of each pair of third permanent magnets (50) is arranged substantially along the radial direction.
[0012]
12. Rotor intended for the rotational electric machine, according to any one of claims 1 to 11, CHARACTERIZED by the fact that the first permanent magnet is positioned in the radial direction, in the radial direction, of the lateral and peripheral end portions of the pair of second permanent magnets in the radial direction, and of a positioning, in the radial direction, of the lateral end portions and outer periphery of the pair of third permanent magnets in the radial direction, are substantially identical to each other.

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同族专利:

公开号 | 公开日

US20130307363A1|2013-11-21|

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DE112012000667T5|2013-10-31|

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JP2012161227A|2012-08-23|

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BR112013018579A2|2016-09-27|

DE112012000667T8|2014-03-06|

CN103339831B|2015-09-02|

WO2012104715A8|2013-03-07|

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法律状态:
2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

2019-07-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

2020-06-02| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|

2020-12-15| B09A| Decision: intention to grant|

2021-02-23| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 02/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

申请号 | 申请日 | 专利标题

JP2011021411A|JP5643127B2|2011-02-03|2011-02-03|Rotating machine rotor|

JP2011-021411|2011-02-03|

PCT/IB2012/000170|WO2012104715A1|2011-02-03|2012-02-02|Rotor for electric machine|

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