JP2014212589A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor having a flux barrier, that can maintain a desired performance, in a rotor core where reduction of the manufacturing cost and high performance can be combined by reducing a resin material filling the flux barrier.SOLUTION: A flux barrier 19 communicating with a mounting hole 18, to be embedded with the permanent magnet 17 of a rotor core 15, is formed in a rotor 14. A partition 31 for sectioning the interior of the flux barrier 19 into multiple regions is formed in the flux barrier 19. In the flux barrier 19 of the rotor 14, a resin filled portion 34 composed of a resin material is formed between the partition 31 and the inner wall 19A on the outer peripheral side, a gap 36 is formed between the partition 31 and the inner wall 19B on the inner peripheral side, and the short circuit flux of a permanent magnet 17 is reduced by the resin filled portion 34 and the gap 36.

Description

  The present invention relates to a rotor in which a flux barrier is provided on a rotor core and a rotating electrical machine including the rotor.

  A rotary electric machine including a rotor provided in a manner in which a permanent magnet is embedded in a rotor core, for example, an IPM motor in which a flux barrier is formed at the periphery of a mounting hole of a rotor core in which a permanent magnet is embedded (for example, Patent Document 1) ). In the rotor disclosed in Patent Document 1, a plate-like permanent magnet is inserted into a mounting hole formed along the axial direction of the rotor core. In the rotor core, a through hole that penetrates the rotor core in the axial direction and communicates with the mounting hole is formed as a flux barrier at a portion corresponding to the end of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet. . When the flux barrier is filled with a resin material, a resin-filled portion that suppresses a short-circuit magnetic flux that may be generated at the periphery of the end portion of the permanent magnet is formed in the flux barrier. The permanent magnet is fixed to the rotor core with a resin material filled in the flux barrier. The resin material is, for example, an epoxy resin having thermosetting properties.

JP 2011-239607 A

  By the way, the above-described rotor preferably has a structure that can reduce the resin material filled in the flux barrier from the viewpoint of reducing the manufacturing cost. On the other hand, the shape of the flux barrier affects various performances such as the output torque of the motor. For example, when the flux barrier is enlarged and the resin filling portion is expanded, the short-circuit magnetic flux of the permanent magnet is further reduced, while the inductances of the q-axis and d-axis magnetic paths change according to the size of the flux barrier. For this reason, the shape of the flux barrier is, for example, the magnitude of the torque to be used more effectively among the reluctance torque generated according to the magnet torque by the permanent magnet or the difference between the q-axis and d-axis inductances, or the total output of each torque. It is determined based on the magnitude of the torque. Therefore, if the flux barrier and the resin filling portion are simply reduced in order to reduce the resin material, it becomes difficult to maintain the rotating electrical machine at a desired performance.

  The present invention relates to a rotor in which a flux barrier is provided on a rotor core, and a flux barrier capable of maintaining a desired performance is provided. By reducing the resin material filled in the flux barrier, the manufacturing cost is reduced and the performance is improved. Provided are a rotor and a rotating electrical machine that can be compatible with each other.

  A rotor according to one aspect of the present invention includes a rotor core provided so as to be integrally rotatable with respect to a rotation shaft, a plurality of mounting holes penetrating the rotor core in the axial direction, and a plurality of permanent magnets accommodated in the mounting holes. A flux barrier that extends in the axial direction of the rotor core and is arranged on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet, and the flux barrier is divided into a plurality of regions along the axial direction. In the flux barrier, one of the inner surfaces facing each other in the magnetization direction is connected to the rotor hole, and the plurality of regions in the flux barrier partitioned by the partition communicate with the mounting hole. And a resin filling portion formed by filling a resin material in the region to be formed.

  In the rotor, a flux barrier that penetrates the rotor core is provided on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet accommodated in the mounting hole of the rotor core. The flux barrier is partitioned into a plurality of regions along the axial direction by the partition portion, and a resin filling portion in which a resin material is filled in a region communicating with the mounting hole among the plurality of regions is formed. In such a configuration, a partition portion is provided in the flux barrier without changing the shape of the flux barrier, which is difficult to change the shape of the rotating electrical machine having the rotor, because it has a great influence on the performance. The resin filling portion can be made small, that is, the resin material to be filled can be reduced. In addition, in the flux barrier, a magnetic resistance is obtained by forming a gap in an area not filled with the resin material, or by providing a non-magnetic material that is less expensive than the resin material. By forming a relatively high area, it is possible to reduce the short-circuit magnetic flux that can be generated at the periphery of the end of the permanent magnet.

  Furthermore, the partition is connected to the rotor core on one side of the inner surfaces of the flux barrier that face each other in the magnetization direction. Here, when the partition portion is formed so as to connect the inner surfaces of the flux barriers facing each other in the magnetization direction, the partition portion is formed along the direction of the short-circuit magnetic flux, and the magnetic flux generated from the permanent magnet It becomes easy to short-circuit through the partition. As a result, even if the resin material can be reduced, it becomes difficult to maintain the desired performance. On the other hand, in the rotor, the short-circuit magnetic flux flows between the inner surfaces facing each other through the partition portion by connecting the partition portion to the rotor core on one surface side of the inner surfaces facing each other in the magnetization direction. Can be reduced. As a result, the provision of a flux barrier on the rotor core can contribute to a desired high performance such as an increase in the output torque of the rotating electrical machine, and the production cost can be reduced by reducing the resin material. A rotor capable of achieving both reduction in manufacturing cost can be configured.

  A rotor according to another aspect of the present invention is the rotor according to claim 1, wherein the partition portion biases the end of the permanent magnet from the outside in the direction perpendicular to the magnetization direction. It is formed as a part.

  In the rotor, it is possible to prevent the displacement of the permanent magnet by forming the partition portion as an urging portion and pressing the end of the permanent magnet from the outside in the direction perpendicular to the magnetization direction.

  A rotor according to another aspect of the present invention is the rotor according to any one of claims 1 and 2, wherein the partition portion is formed integrally with the rotor core, and part or all of the partition portion is formed. It is made non-magnetic.

  In the rotor, since the partition portion is formed integrally with the rotor core, for example, the partition portion can be formed in the same process as the press processing for the electromagnetic steel sheet constituting the rotor core, and compared with the case where the partition portion is a separate member. Work man-hours can be reduced. That is, the manufacturing cost can also be reduced by forming the partition part integrally with the rotor core. Moreover, since the demagnetization process is performed on the partition portion and the magnetic resistance is increased, the short-circuit magnetic flux that can be generated in the partition portion can be suppressed. Furthermore, preferably, a partition portion that has been demagnetized is provided at a position close to the end portion of the permanent magnet in the direction perpendicular to the magnetization direction, and resin is filled only between the end portion of the permanent magnet and the partition portion. By forming the portion, the resin material can be greatly reduced, and the manufacturing cost can be reduced.

  In addition, a rotor according to one aspect of the present invention includes a rotor core provided so as to be integrally rotatable with respect to a rotation shaft, a plurality of mounting holes penetrating the rotor core in the axial direction, and a plurality of housings accommodated in the mounting holes. A non-magnetic material provided separately from the permanent magnet, a flux barrier that is axially penetrated into the rotor core, and is disposed on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet. A partition portion that partitions the flux barrier into a plurality of regions along the axial direction, and a region that communicates with the mounting hole among the plurality of regions in the flux barrier partitioned by the partition portion. A resin-filled portion formed by filling a material, and the flux barrier is provided with an insertion groove into which the partition portion is inserted in the axial direction, and the resin-filled portion is permanently connected to the partition portion inserted into the insertion groove. In the area between the magnets Hama and characterized in that it is formed by.

  In the rotor, the partition portion is formed in a plate shape made of a nonmagnetic material, and is inserted into an insertion groove provided in the flux barrier. The flux barrier is provided with a resin filling portion formed by filling a resin material in a region between the partition portion inserted into the insertion groove and the permanent magnet. In such a configuration, by adjusting the position where the insertion groove and the partitioning portion are provided, the region for forming the resin filling portion in the flux barrier can be reduced, that is, the resin material to be filled can be reduced. Thereby, it is possible to achieve both reduction in manufacturing cost by reducing the resin material and high performance by providing a flux barrier in which a desired shape is maintained only by changing the shape in which the insertion groove is formed.

  In addition, a rotor according to one aspect of the present invention includes a rotor core provided so as to be integrally rotatable with respect to a rotation shaft, a plurality of mounting holes penetrating the rotor core in the axial direction, and a plurality of housings accommodated in the mounting holes. A permanent magnet, a flux barrier that extends in the axial direction of the rotor core and is disposed on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet, and a part or the whole of the permanent magnet that is formed integrally with the rotor core Is made demagnetized, and a resin material is applied to a region that communicates with the mounting hole among a plurality of regions in the flux barrier partitioned by the partition portion and the partition portion that partitions the flux barrier in the axial direction. And a resin filling portion formed by filling.

  In the rotor, by forming the partition part integrally with the rotor core, for example, the partition part can be formed in the same process as the press process for the electromagnetic steel sheet constituting the rotor core, thereby reducing the work man-hours and reducing the manufacturing cost. Moreover, the partition part is subjected to a demagnetization process to suppress a short-circuit magnetic flux. Furthermore, preferably, by providing a partition portion subjected to demagnetization processing at a position close to the permanent magnet, the resin material filled in the flux barrier can be greatly reduced, and the manufacturing cost can be reduced.

  A rotating electrical machine according to one aspect of the present invention includes the rotor according to any one of claims 1 to 5, thereby providing a partition in the flux barrier to reduce the resin material and reduce the manufacturing cost. A rotating electrical machine that can achieve both reduction and high performance can be configured.

  According to the present invention, with respect to a rotor in which a flux barrier is provided on a rotor core, a flux barrier capable of maintaining desired performance is provided, and by reducing the resin material filled in the flux barrier, the manufacturing cost can be reduced. It is possible to provide a rotor and a rotating electrical machine that can achieve both high performance.

It is a schematic diagram which shows the relationship between the stator and rotor of the rotary electric machine which concern on this embodiment. It is the elements on larger scale of the rotor of FIG. 1, and the enlarged view of the part which concerns on a flux barrier. It is an enlarged view of the part which concerns on the flux barrier of another rotor. It is an enlarged view of the part which concerns on the flux barrier of another rotor. It is the elements on larger scale of another rotary electric machine, and the elements on larger scale of the permanent magnet arrange | positioned in the center among the magnetic poles comprised with three permanent magnets. It is the elements on larger scale of the permanent magnet and flux barrier which are arrange | positioned in another center. It is the elements on larger scale of the permanent magnet and flux barrier which are arrange | positioned in another center.

  Hereinafter, an embodiment in which the present invention is embodied in an electric motor will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing a stator (stator) 11 and a rotor (rotor) 14 of an electric motor 10. As shown in FIG. 1, the stator 11 of the electric motor 10 is formed in a cylindrical shape, and teeth 12 projecting inward in the radial direction are formed on the inner peripheral portion. A plurality of teeth 12 (48 in this embodiment) are formed at equal intervals along the circumferential direction of the stator 11. In each of the teeth 12, a coil (winding) 13 is wound by distributed winding, for example. For example, the coil 13 is wound corresponding to each phase (U phase, V phase, and W phase) of a three-phase alternating current, and a rotating magnetic flux is generated by supplying an alternating current of each phase.

  A rotor 14 is provided inside the stator 11. The rotor 14 includes a rotor core 15, a rotating shaft 16, and a permanent magnet 17. For example, the rotor core 15 has a substantially cylindrical shape formed by laminating a plurality of disk-shaped electromagnetic steel plates. The rotor core 15 is configured by laminating a plurality of electromagnetic steel plates and integrally connecting them by caulking or the like. In the rotor 14, a rotation shaft 16 is inserted in a central portion in the radial direction of the rotor core 15, and the rotor core 15 is fixed to the rotation shaft 16 so as to be integrally rotatable. The rotor 14 is rotatably supported via a rotating shaft 16 by a bearing of a housing (not shown) in a state where the outer peripheral surface of the rotor core 15 faces the teeth 12 with a predetermined interval in the radial direction.

  The rotor core 15 includes a plurality of (eight in the present embodiment) magnetic poles at equal intervals along the circumferential direction, and a pair of mounting holes 18 are formed in each magnetic pole. Each of the pair of mounting holes 18 is formed in a V shape that penetrates the rotor core 15 in the axial direction, and that an angle formed with each other along the circumferential direction of the rotor core 15 increases toward the outer peripheral side of the rotor 14. Each mounting hole 18 has a substantially rectangular cross-sectional shape cut by a plane orthogonal to the axial direction, and the longitudinal direction of the cross-sectional shape is V-shaped. A permanent magnet 17 formed in a plate shape is embedded in each mounting hole 18 so as to intersect the radial direction of the rotor 14. Therefore, the electric motor 10 of the present embodiment is a so-called IPM motor, and two permanent magnets 17 embedded in the rotor core 15 are provided per magnetic pole and arranged in a V shape.

  The pair of permanent magnets 17 are magnetized so that the magnetization direction is the thickness direction (short direction of the cross-sectional shape), and the outer peripheral side facing the teeth 12 has the same polarity. Further, the permanent magnet 17 has a different magnetic pole on the outer peripheral side facing the teeth 12 for each adjacent magnetic pole. For example, in the permanent magnet 17 forming an arbitrary pair of N poles, the teeth 12 side of the permanent magnets 17 of the magnetic poles adjacent in the circumferential direction are S poles.

  As shown in FIG. 2, the pair of permanent magnets 17 constituting one magnetic pole is fixed at a position that is symmetric with respect to the d-axis 21 along the radial direction through the center of the magnetic pole. In the rotor core 15, in a portion corresponding to the end portion 17 </ b> A of the permanent magnet 17 in the vertical direction D <b> 2 perpendicular to the magnetization direction D <b> 1 of the permanent magnet 17, a through-hole penetrating the rotor core 15 in the axial direction serves as a flux barrier 19. Is formed. The flux barrier 19 is an end portion on the outside (q-axis 22 side) with respect to the d-axis 21 of the mounting hole 18, in other words, from the d-axis 21 out of the end portions 17A and 17B of the permanent magnet 17 in the vertical direction D2. Is communicated with the mounting hole 18 at the end portion 17A of the outer portion which is far away.

  The flux barrier 19 is formed to protrude toward the outside in the vertical direction D2. The flux barrier 19 is formed so that the inner wall 19A on the outer peripheral side of the rotor core 15 of the inner walls 19A and 19B facing each other in the magnetization direction D1 is along the outer peripheral surface of the rotor core 15, and the inner wall 19B on the inner peripheral side is in the vertical direction D2. The width along the magnetization direction D1 decreases toward the outside of the vertical direction D2. The flux barrier 19 is formed with a partition 31 that partitions the flux barrier 19. The partition portion 31 is formed, for example, in a step of punching out each electromagnetic steel plate constituting the rotor core 15 by press working, and has an arc shape formed with substantially the same width L in plan view of the electromagnetic steel plate. The width L of the partition portion 31 is formed to be an extremely narrow width, for example, a width that becomes a precision limit of punching in press working. As an example, the width L is twice as large as the thickness of the electrical steel sheet (for example, 0.3 mm). It is formed with a width (in this case, 0.6 mm).

  In the rotor core 15 after laminating each electromagnetic steel sheet, the partition 31 has arc-shaped end portions 31A formed integrally with the inner wall 19B and has the same shape along the axial direction. In other words, in the partition portion 31, both end portions 31A are connected to the inner wall 19B on the inner peripheral side among the inner walls 19A and 19B facing each other in the magnetization direction D1 in the flux barrier 19. Moreover, the partition part 31 protrudes in the circular arc shape along the edge part 17A of the permanent magnet 17 in the permanent magnet 17 side from the middle point of 31A of both ends connected to the inner wall 19B. The partition portion 31 has a shape that swells toward the permanent magnet 17 when the rotor core 15 is viewed from the axial direction, and is formed so that the outer peripheral surface 31B facing the end portion 17A of the permanent magnet 17 is large. Yes.

  Each of the permanent magnets 17 is fixed to the mounting hole 18 by a resin portion 33 filled with a resin material. For example, the resin material of the resin portion 33 is preferably a thermosetting resin having strong adhesiveness such as an epoxy resin, but other resin materials such as a thermoplastic resin may be used. The resin portion 33 is formed by fixing the rotor core 15 in which the permanent magnet 17 is inserted into the mounting hole 18 to a mold and filling a resin material in the gap between the permanent magnet 17 and the mounting hole 18 by injection molding or the like. . At this time, the permanent magnet 17 in the mounting hole 18 before being filled with the resin material is urged and positioned from the q-axis 22 side toward the d-axis 21 by the outer peripheral surface 31B of the partition portion 31.

  The flux barrier 19 is filled with a resin material between the inner wall 19 </ b> A on the outer peripheral side and the partition portion 31, and a resin filling portion 34 formed integrally with the resin portion 33 is formed. In addition, the flux barrier 19 is formed with a gap 36 extending in the axial direction between the inner wall 19 </ b> B on the inner peripheral side and the partition portion 31. Therefore, the flux barrier 19 is partitioned into the resin filling part 34 and the gap 36 by the partition part 31. Although not shown, the rotor core 15 may have a configuration in which the short-circuit magnetic flux is suppressed by forming the resin portion 33 so as to cover the end portion of the permanent magnet 17 in the axial direction.

According to the above-described embodiment, the following effects can be obtained.
<Effect 1> In the rotor 14 of the present embodiment, the short-circuit magnetic flux of the permanent magnet 17 is reduced while reducing the resin material in the flux barrier 19. More specifically, the rotor 14 has a permanent magnetic flux generated from the N pole of the permanent magnet 17 by forming a resin filling portion 34 made of a resin material between the partition portion 31 and the inner wall 19A on the outer peripheral side. The short-circuit magnetic flux that flows along the periphery of the end portion 17A of the magnet 17 and moves toward the south pole is reduced. Further, a gap 36 is formed between the partition portion 31 and the inner wall 19 </ b> B on the inner peripheral side, and the short-circuit magnetic flux is also reduced by the gap 36. Therefore, in the rotor 14 of this embodiment, since the influence on the performance of the electric motor 10 is great, the shape of the outer periphery of the flux barrier 19 that is difficult to change its shape is substantially the same, and the partition portion 31 is provided in the flux barrier 19. The resin material necessary for the resin filling portion 34 is reduced while the resin filling portion 34 and the gap 36 are provided to reduce the short-circuit magnetic flux. That is, both reduction in manufacturing cost by reducing the resin material and high performance by providing the flux barrier 19 in which a desired shape is maintained are achieved. According to the simulation results of the present inventors, the rotor 14 provided with the partition portion 31 can suppress the reduction in the maximum output torque to 2% compared to the rotor not provided with the partition portion 31, In addition, the resin material required for filling can be reduced by 33%.

<Effect 2> The partition portion 31 is formed in an arc shape in which both end portions 31A are connected to the inner wall 19B on the inner peripheral side of the flux barrier 19, and a gap 36 partitioned from the resin filling portion 34 between the inner wall 19B. Is forming. Here, in the configuration in which each of the end portions 31A of the partition portion 31 is connected to the inner walls 19A and 19B facing each other in the magnetization direction D1, the partition portion 31 is formed along the direction of the short-circuit magnetic flux, and the permanent magnet The magnetic flux generated from 17 flows through the partition portion 31 and is easily short-circuited. As a result, even if the resin material can be reduced, it becomes difficult to maintain the desired performance. On the other hand, in the partition part 31 of this embodiment, short-circuit magnetic flux flows between the inner walls 19A and 19B through the partition part 31 by connecting both end parts 31A of the partition part 31 to the inner wall 19B on the inner peripheral side. Can be reduced. Thereby, the partition part 31 which can aim at coexistence of reduction of manufacturing cost and performance improvement can be easily formed in the flux barrier 19. FIG.

<Effect 3> The partition portion 31 has an arc shape projecting along the end portion 17A of the permanent magnet 17 on the permanent magnet 17 side from the middle point of both end portions 31A connected to the inner wall 19B, and swells toward the permanent magnet 17 side. It has a shape. Here, if the flux barrier 19 is formed to be large, the permanent magnet 17 accommodated in the mounting hole 18 may be tilted before being filled with the resin material, or the axial position may be shifted. On the other hand, the partition part 31 of this embodiment forms the outer peripheral surface 31B which opposes the edge part 17A of the permanent magnet 17, and urges | biases the permanent magnet 17 toward the d-axis 21 side from the q-axis 22 side. Accordingly, the end portion 17A of the permanent magnet 17 can be pressed by the partition portion 31 to prevent the displacement.

<Effect 4> The partition portion 31 is formed with a very narrow width L viewed from the axial direction of the rotor core 15. Thereby, the partition part 31 is easily magnetically saturated inside by the magnetic flux that is generated from the permanent magnet 17 and can short-circuit the partition part 31, and it is possible to reduce the occurrence of short-circuit magnetic flux by increasing the magnetic resistance.

<Effect 5> The partition part 31 is formed in the same process as the press work for each electromagnetic steel sheet constituting the rotor core 15. Thereby, work man-hours can be reduced compared with the case where the partition part 31 is made into another member. That is, the manufacturing cost can also be reduced by integrally forming the partition portion 31 with the rotor core 15.

As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the gist of the present invention.
For example, in the above embodiment, the both end portions 31A of the partition portion 31 are integrally formed on the inner wall 19B on the inner peripheral side of the rotor core 15, but the present invention is not limited to this. For example, in the rotor 14A shown in FIG. 3, both end portions 31A of the partition portion 31 of the rotor core 15 are connected to the inner wall 19A on the outer peripheral side. The partition portion 31 has an arc shape that swells toward the permanent magnet 17 when the rotor 14A is viewed from the axial direction, and is formed so that the outer peripheral surface 31B facing the end portion 17A of the permanent magnet 17 is large. . Even in such a configuration, it is possible to obtain the same effect as in the above embodiment.

  Further, for example, like the rotor 14B shown in FIG. 4, each of the end portions 31A of the partition portion 31 may be connected to the inner walls 19A and 19B. The partition portion 31 of the rotor 14B shown in FIG. 4 is formed along the magnetization direction D1 of the permanent magnet 17 at a position close to the permanent magnet 17, and the end portion 31A is integrally formed with each of the inner walls 19A and 19B. . In the flux barrier 19, the resin filling portion 34 is formed only in a very narrow region between the partition portion 31 and the end portion 17 </ b> A of the permanent magnet 17, and a gap 36 is provided in a region outside the partition portion 31. Incidentally, the corner portion of the plate-like permanent magnet 17 is chamfered in the permanent magnet 17 shown in FIG. 4, and the stress concentrated on the corner portion is mitigated as the rotor 14A rotates.

  Moreover, in the partition part 31 shown in FIG. 4, it is preferable that the process of demagnetization is performed and the magnetic resistance is raised (area | region shown by the hatching of FIG. 4). This demagnetization treatment may be performed, for example, by a surface treatment such as heat treatment or shot peening for irradiating a portion corresponding to the partition portion 31 in each electromagnetic steel sheet before lamination. Alternatively, the demagnetization process may be performed after the permanent magnet 17 is inserted into the mounting hole 18 and filled with the resin material. For example, the partition portion 31 of the rotor core 15 after filling may be physically cut by cutting or the like from the gap 36 side to form a gap in the middle of the partition portion 31 to increase the magnetic resistance. In such a configuration, the partition part 31 with increased magnetic resistance can be formed at a position close to the permanent magnet 17, and the resin filling part 34 can be made extremely small to greatly reduce the resin material. Further, according to the simulation results of the present inventors, the rotor 14B provided with the partition portion 31 can obtain a result that the resin material necessary for filling can be reduced by 67% compared to the rotor 14B provided with no partition portion 31. ing.

  The number and arrangement of the permanent magnets 17 provided on one magnetic pole are not limited to the above embodiment. For example, as shown in FIG. 5, you may comprise the permanent magnet 41 arrange | positioned between the permanent magnets 17 arrange | positioned at V shape. In the rotor 14C of the electric motor 10A shown in FIG. 5, a permanent magnet 41 having the same shape as the permanent magnet 17 is provided between the inner peripheral portions of a pair of permanent magnets 17 arranged in a V shape, and the magnetization direction D1 is a radial direction. Is embedded in the mounting hole 42 (see the enlarged view of FIG. 5). Incidentally, in the stator 11 of the electric motor 10 </ b> A shown in FIG. 5, the coil 13 is concentratedly wound around the teeth 12.

  As shown in the enlarged view of FIG. 5, the mounting hole 42 has flux barriers 43A and 43B formed at positions corresponding to both end portions 41A and 41B in the vertical direction D2. In the flux barrier 43A corresponding to the end 41A, a partition 46 formed separately from the rotor core 15 is inserted in the axial direction. Since the flux barrier 43B has the same structure as the flux barrier 43A, the description thereof is omitted as appropriate. The partition 46 is made of a nonmagnetic material, for example, and is formed in a plate shape along the axial direction. The material of the partition part 46 is preferably a material having heat resistance, such as aluminum, copper, carbon fiber reinforced plastic, and the like. Or you may comprise the partition part 46 by forming the insulating paper and steel plate which have rigidity in plate shape.

  The rotor core 15 is formed with an insertion groove 48 that is recessed in accordance with the shape of the partition 46 in each of the inner walls 47A and 47B of the flux barrier 43A. Each insertion groove 48 is formed to protrude outward from the flux barrier 43 </ b> A in the axial direction view of the rotor core 15. As for the partition part 46, the edge part of the longitudinal direction is inserted in the insertion groove 48 of each flux barrier 43A, 43B in an axial direction view. After the insertion, the partition 46 is fixed by forming a resin part 51 and a resin filling part 52 in an area communicating with the mounting hole 42 by injection molding or the like. The resin filling portion 52 is filled only in the region on the permanent magnet 41 side by the partition portion 46 in the flux barriers 43A and 43B. In addition, a gap 53 is formed in each flux barrier 43A, 43B in a region outside the partitioning portion 46. Therefore, the amount of the resin material required for the resin filling portion 52 is changed by adjusting the position where the partition portion 46 that partitions the flux barriers 43A and 43B is provided. By providing the partition 46 at a position closer to the permanent magnet 41, the resin material can be greatly reduced. Further, in the flux barriers 43 </ b> A and 43 </ b> B, the change in the shape of the outer periphery is only the change in the portion where the insertion groove 48 is formed, compared to the case before the partition portion 46 is provided. As a result, it is possible to achieve both reduction in manufacturing cost by reducing the resin material and high performance by providing the flux barriers 43A and 43B in which a desired shape is maintained. Furthermore, by using the partition portion 46 as a separate member from the rotor core 15, the magnetic resistance of the connecting portion between the partition portion 46 and the insertion groove 48 is increased, and the short-circuit magnetic flux that can be generated in the partition portion 46 can be reduced. The number of the permanent magnets 17 and 41 provided in one magnetic pole may be one (for example, only the permanent magnet 41) or may be four or more (for example, four permanent magnets 17). Further, the flux barrier 43A provided with the partition 46 shown in FIG. 5 may be formed in the rotor core 15 so as to communicate with the mounting hole 18 of the V-shaped permanent magnet 17. Further, the flux barriers 43A and 43B shown in FIG. 5 may be configured such that partition portions 46 having different shapes are provided.

  Further, in another embodiment shown in FIG. 5, the insertion groove 48 is formed to be recessed with respect to the inner walls 47A and 47B of the flux barriers 43A and 43B. However, as shown in FIG. The protrusions 55A and 55B may be provided, and the insertion groove 48 may be formed in a portion sandwiched between the protrusions 55A and 55B. In the flux barriers 43A and 43B shown in FIG. 6, a pair of convex portions 55A and 55B projecting along the magnetization direction D1 of the permanent magnet 41 are formed on the inner walls 47A and 47B, respectively. The protrusions 55A and 55B may have the same length protruding in the magnetization direction D1, or may have different lengths. The partition part 46 is inserted in the insertion groove 48 formed in the part pinched | interposed into each convex part 55A, 55B. 6 has a shorter magnetization direction D1 than that shown in FIG. Even in such a configuration, it is possible to achieve both reduction in manufacturing cost and higher performance as in the configuration shown in FIG.

  Further, in another embodiment shown in FIGS. 5 and 6, the partition portion 46 provided as a member different from the rotor core 15 is formed in a plate shape, but is not limited thereto. For example, as shown in FIG. 7, the partition portion 46 </ b> A may be configured with a cylindrical member along the axial direction. The partition 46A shown in FIG. 7 is made of a nonmagnetic material, and is formed in accordance with the shape of the tip portions (the left and right end portions in the drawing) of the flux barriers 43A and 43B. Engagement portions 57 projecting in the magnetization direction D1 are formed on the inner walls 47B of the flux barriers 43A and 43B. The partition 46A is inserted into the flux barriers 43A and 43B so as to be fitted along the inner walls 47A and 47B, and the inner (permanent magnet 41 side) end is locked by the engaging portion 57. After the insertion, the partition portion 46A is formed by fixing the resin portion 51 and the resin filling portion 52 in an area communicating with the mounting hole 42 by injection molding or the like. A resin filling portion 52 is formed between the partition portion 46 </ b> A and the permanent magnet 41. Further, a gap 53 along the axial direction is formed in the partition portion 46A. Even in such a configuration, it is possible to achieve both reduction in manufacturing cost and higher performance as in the configuration shown in FIG.

  In the above embodiment, the partition portion 31 is configured as a biasing portion that biases the permanent magnet 17 from the q-axis 22 side toward the d-axis 21, but contacts the end portion 17 </ b> A of the permanent magnet 17. Thus, it may be formed as a restricting portion that restricts movement in the vertical direction D2. That is, the partition portion 31 is not limited to a configuration that applies a force that suppresses the displacement, and may be configured to contact only according to the displacement of the permanent magnet 17.

In addition, the demagnetization process for the partition part 31 shown in FIG. 4 may be performed on only a part of the partition part 31 or a predetermined number of electrical steel sheets among a plurality of electrical steel sheets constituting the rotor core 15. The portion corresponding to the partition portion 31 may be processed. Moreover, you may perform such a demagnetization process with respect to the other partition part 31, for example, the arc-shaped partition part 31 of the said embodiment.
In the above embodiment, the gap 36 may be provided with a nonmagnetic material that is less expensive than the resin material.
In the above embodiment, a plurality of partition portions 31 may be provided in one flux barrier 19.
Moreover, in the said embodiment, although embodied in the electric motor 10 as the rotary electric machine of this invention, you may materialize in a generator.

  The configuration of the above embodiment is merely an example, and the shape, number, and the like may be changed as appropriate. For example, the shape and number of the mounting holes 18 and the flux barrier 19 are examples, and may be changed as appropriate. The coil 13 of the stator 11 is not limited to being driven by a three-phase alternating current, but may be a single-phase alternating current, a two-phase alternating current, or a four-phase or more multi-phase alternating current. Moreover, although the rotor core 15 was formed by laminating electromagnetic steel plates, it may be formed of an iron ingot or a powder-molded magnetic body (SMC: Soft Magnetic Composites).

  Incidentally, the electric motor 10 is an example of a rotating electrical machine, the rotors 14, 14A to 14C are examples of a rotor, the rotor core 15 is an example of a rotor core, the rotating shaft 16 is an example of a rotating shaft, the permanent magnets 17, 41 is an example of a permanent magnet, mounting holes 18 and 42 are examples of mounting holes, ends 17A, 17B, 41A and 41B are examples of ends of permanent magnets, and flux barriers 19, 43A and 43B are As an example of the flux barrier, the inner walls 19A, 19B are examples of the inner surface, the partition portions 31, 46, 46A are examples of the partition portion, and the resin filling portions 34, 52 are examples of the resin filling portion. , 53 can be given as an example of a gap.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 14, 14A-14C Rotor, 15 Rotor core, 16 Rotating shaft, 17, 41 Permanent magnet, 18, 42 Mounting hole, 17A, 17B, 41A, 41B End, 19, 43A, 43B Flux barrier, 19A , 19B Inner wall, 31, 46, 46A Partition part, 34, 52 Resin filled part, 36, 53 Gap, D1 magnetization direction, D2 vertical direction.

Claims (6)

A rotor core provided so as to be integrally rotatable with respect to the rotation shaft;
A plurality of mounting holes penetrating the rotor core in the axial direction;
A plurality of permanent magnets housed in the mounting holes;
A flux barrier disposed in the rotor core in the axial direction and disposed on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet;
Partitioning the flux barrier into a plurality of regions along the axial direction, and a partition portion provided continuously to the rotor core on one side of the inner surfaces of the flux barrier facing each other in the magnetization direction;
A resin filling portion formed by filling a resin material in a region communicating with the mounting hole among a plurality of regions in the flux barrier partitioned by the partition;
A rotor characterized by comprising: The rotor according to claim 1,
The said partition part is formed as a biasing part which hold | suppresses the edge part of the said permanent magnet from the outer side of the direction perpendicular | vertical with respect to the said magnetization direction, The rotor characterized by the above-mentioned. The rotor according to claim 1 or 2,
The said partition part is integrally formed with the said rotor core, The one part or the whole is made non-magnetic, The rotor characterized by the above-mentioned. A rotor core provided so as to be integrally rotatable with respect to the rotation shaft;
A plurality of mounting holes penetrating the rotor core in the axial direction;
A plurality of permanent magnets housed in the mounting holes;
A flux barrier disposed in the rotor core in the axial direction and disposed on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet;
A partition part that is provided as a member different from the rotor core and is formed of a nonmagnetic material, and partitions the flux barrier into a plurality of regions along the axial direction;
A resin filling portion formed by filling a resin material in a region communicating with the mounting hole among a plurality of regions in the flux barrier partitioned by the partition;
With
The flux barrier is provided with an insertion groove into which the partition portion is inserted in the axial direction,
The resin filling portion is formed by filling a region between the partition portion inserted into the insertion groove and the permanent magnet. A rotor core provided so as to be integrally rotatable with respect to the rotation shaft;
A plurality of mounting holes penetrating the rotor core in the axial direction;
A plurality of permanent magnets housed in the mounting holes;
A flux barrier disposed in the rotor core in the axial direction and disposed on the end side of the permanent magnet in a direction perpendicular to the magnetization direction of the permanent magnet;
A partition part formed integrally with the rotor core, part or all of which is demagnetized, and partitions the flux barrier into a plurality of regions along the axial direction;
A resin filling portion formed by filling a resin material in a region communicating with the mounting hole among a plurality of regions in the flux barrier partitioned by the partition;
A rotor characterized by comprising:   A rotating electrical machine comprising the rotor according to any one of claims 1 to 5.

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