ROTOR, ROTATING ELECTRIC MACHINE, AND DRIVE DEVICE

Abstract

To provide a technique capable of improving manufacturing efficiency of a rotor having a skewed rotor core.SOLUTION: A rotor 10 includes a magnet 11 constituting each magnetic pole, a rotor core 12 having an axially extending accommodation hole 12b for accommodating the magnet, and a resin 13 to be put into the accommodation hole. The rotor core includes a first block 121, and a second block 122 that is axially arranged together with the first block and arranged such that the position of the accommodation hole in the circumferential direction is shifted with respect to the first block. Each of the first block and the second block includes a resin groove that extends from the upper end to the lower end in the axial direction in communication with the accommodation hole of each block, and filled with the resin. The resin groove of the first block and the resin groove of the second block are at least partially overlapped and connected in the axial direction, or are connected through the resin groove of at least one other block arranged between the first block and the second block in the axial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a rotor, a rotating electric machine, and a drive device. [Background technology]

[0002] Conventionally, a laminated rotor core is known that is manufactured by fixing a permanent magnet to a laminated body by resin sealing (see, for example, Patent Document 1). In addition, in a rotating electric machine having a permanent magnet rotor, the rotor is given a skew structure in order to reduce cogging torque (see, for example, Patent Document 2). In a skew structure, a laminated rotor core is divided into multiple pieces together with the permanent magnet in the lamination direction, and each divided rotor core is assembled with a predetermined angle offset.

[0003] Incidentally, permanent magnets are inserted into the magnet insertion sections of the rotor core and fixed in place with adhesive using a filler. In a skewed structure, the positions of the magnet insertion sections are misaligned between the split rotor cores, so when filling the magnet insertion sections with filler after stacking multiple split rotor cores, there is a possibility that the magnet insertion sections will not be filled sufficiently with filler. For this reason, conventionally, the magnet insertion sections are filled with filler for each divided tier. However, in this case, the work time tends to be long.

[0004] For this reason, it is known that a rotor having a skewed rotor core that is divided into multiple stages in the axial direction and arranged with a circumferential phase angle between each stage, and permanent magnets that create poles, is configured as follows (see Patent Document 2, for example). The rotor core has insertion holes for inserting the permanent magnets, and at least one intermediate hole that is provided between the poles and independent of the insertion holes. The rotor core insertion hole in a certain stage communicates with the intermediate hole in an adjacent stage. With this configuration, the intermediate hole ensures a supply path for filler to the permanent magnet insertion holes, so that a rotor having a skewed rotor core can be manufactured at low cost. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-282392 A [Patent Document 2] JP 2011-55641 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned configuration in which intermediate holes are provided between the poles of the permanent magnets, the intermediate holes may affect the magnetic properties depending on, for example, the angle at which the permanent magnets are provided, etc. For this reason, other techniques are desired that can efficiently manufacture skewed rotor cores.

[0007] An object of the present disclosure is to provide a technique capable of improving the manufacturing efficiency of a rotor having a skewed rotor core (rotor iron core). [Means for solving the problem]

[0008] An exemplary rotor according to the present disclosure is used in an inner rotor type rotating electric machine, and has a plurality of magnetic poles in a circumferential direction around a central axis extending vertically, the rotor core having magnets constituting each of the magnetic poles, an axially extending housing hole for housing the magnets, and resin filled in the housing hole. The rotor core has a first block and a second block arranged in the axial direction together with the first block, the second block being arranged such that the circumferential position of the housing hole is shifted with respect to the first block. The first block and the second block have resin grooves extending from the upper end to the lower end in the axial direction and communicating with the housing hole of each block, and into which the resin is filled. The resin groove of the first block and the resin groove of the second block are connected to each other by at least a portion of the resin grooves overlapping each other in the axial direction, or are connected to each other via the resin groove of at least one other block arranged between the first block and the second block in the axial direction.

[0009] An exemplary rotating electric machine according to the present disclosure includes a rotor having the above-described configuration and a stator disposed radially outward of the rotor.

[0010] An exemplary drive device of the present disclosure includes a rotating electric machine having the above-described configuration and a gear unit connected to the rotating electric machine. Effect of the Invention

[0011] According to the present disclosure, the manufacturing efficiency of rotors having skewed rotor cores can be improved. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a drive device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view showing a schematic configuration of the rotor of the first embodiment. [Diagram 3] FIG. 3 is a schematic plan view showing an enlarged portion of the first block of the rotor core according to the first embodiment. [Figure 4] FIG. 4 is a schematic plan view showing an enlarged portion of the second block of the rotor core according to the first embodiment. [Diagram 5] FIG. 5 is a schematic perspective view showing a part of a first block and a second block of the rotor core according to the first embodiment, enlarged and viewed obliquely from above. [Figure 6] FIG. 6 is a schematic bottom view showing an enlarged portion of the first block of the rotor core according to the first embodiment. [Figure 7] FIG. 7 is a plan view that illustrates a relationship between the first magnet placed in the first magnet accommodating hole and the first resin groove. [Figure 8] FIG. 8 is a side view that illustrates the rotor of the first embodiment. [Figure 9A] FIG. 9A is a plan view that typically shows the configuration of the first magnetic steel plate. [Figure 9B] FIG. 9B is a plan view that typically shows the configuration of the second magnetic steel plate. [Figure 10] FIG. 10 is a diagram that shows a schematic image of lamination of magnetic steel plates in a block formed by using a first magnetic steel plate and a second magnetic steel plate. [Figure 11] FIG. 11 is a perspective view showing a schematic configuration of a rotor according to the second embodiment. [Figure 12] FIG. 12 is a schematic plan view showing the configuration of a first block of a rotor core according to the second embodiment. [Figure 13A] FIG. 13A is a schematic plan view showing the configuration of a portion of the upper end magnetic steel plate. [Figure 13B] FIG. 13B is a schematic plan view showing the configuration of a portion of the lower end magnetic steel plate. [Figure 13C] FIG. 13C is a schematic plan view showing the configuration of a portion of the intermediate magnetic steel plate. [Figure 14] FIG. 14 is a diagram showing a schematic configuration of a cross section of a part of a block set in which a first block and a second block of a rotor core according to a second embodiment are stacked in the axial direction. [Figure 15] FIG. 15 is a diagram showing an example of a rotor configuration in which a rotor core is made up of five blocks including a first block and a second block. [Figure 16] FIG. 16 is a diagram showing an example of a rotor configuration in which a rotor core is configured with eight blocks including a first block and a second block. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an exemplary embodiment of the present disclosure will be described in detail with reference to the drawings. In this specification, the direction in which the central axis A of the rotating electric machine 100 shown in FIG. 1 extends will be simply referred to as the "axial direction", and the radial direction and circumferential direction around the central axis A of the rotating electric machine 100 will be simply referred to as the "radial direction" and the "circumferential direction". Similarly, for the rotor 10, the directions that coincide with the axial direction, radial direction, and circumferential direction of the rotating electric machine 100 when the rotor 10 is incorporated in the rotating electric machine 100 will be simply referred to as the "axial direction", the "radial direction", and the "circumferential direction". In addition, the direction in which the tangent of the circle centered on the central axis A extends will be simply referred to as the "tangential direction". In this specification, the axial direction when the rotating electric machine is arranged in the direction shown in FIG. 1 is defined as the up-down direction. Note that the up-down direction is a name used simply for explanation, and does not limit the actual positional relationship or direction.

[0014] <1. Drive device and rotating electric machine> 1 is a diagram illustrating a schematic configuration of a drive device 200 according to an embodiment of the present disclosure. As illustrated in FIG 1, the drive device 200 includes a rotating electric machine 100 and a gear unit 101 connected to the rotating electric machine 100.

[0015] In this embodiment, the rotating electric machine 100 is a motor. However, the technology of the present disclosure may be applied to a rotating electric machine configured as a generator. The rotating electric machine 100 has a rotor 10 and a stator 20 disposed radially outward of the rotor 10. That is, the rotating electric machine 100 is an inner rotor type rotating electric machine.

[0016] The rotor 10 has magnets 11 for a magnetic field embedded therein (see FIG. 2, etc., described later). That is, the rotating electric machine 100 is an IPM (Interior Permanent Magnet) type rotating electric machine. The rotor 10 will be described in detail later.

[0017] The stator 20 is an armature of the rotating electric machine 100. The stator 20 is cylindrical and centered on the central axis A. The stator 20 faces the rotor 10 arranged radially inward with a gap therebetween, and surrounds the rotor 10. In detail, the stator 20 has a stator core 21 and a coil 22. The stator core 21 has a cylindrical core back extending in the axial direction, and a plurality of teeth extending radially inward from the core back. The coil 22 is formed by winding a conductor around the teeth of the stator core 21 via an insulator (not shown). When a driving current is supplied to the coil 22, a radial magnetic flux is generated in the teeth of the stator core 21. This generates a circumferential torque in the rotor 10, causing the rotor 10 to rotate around the central axis A.

[0018] The rotating electric machine 100 further includes a columnar shaft 30 extending in the axial direction. The shaft 30 is disposed radially inward of the rotor 10 and fixed to the rotor 10. The shaft 30 rotates together with the rotor 10 about a central axis A. In this embodiment, an upper end of the shaft 30 is inserted into a casing 1011 of the gear unit 101.

[0019] The gear unit 101 has a plurality of gears 1012 in its casing 1011. The plurality of gears 1012 has a shaft gear 1012a, at least one intermediate gear 1012b, and an output shaft gear 1012c. The shaft gear 1012a is attached to the upper end of the shaft 30. The output shaft gear 1012c is attached to an output shaft 1013 of the driving device 200. The intermediate gear 1012b transmits the rotation of the shaft gear 1012a to the output shaft gear 1012c. When the shaft 30 rotates, the shaft gear 1012a rotates, and the force of the rotation is transmitted to the output shaft gear 1012c via the intermediate gear 1012b, causing the output shaft 1013 to rotate.

[0020] As described below, the rotor 10 having the skew structure of the present disclosure can be manufactured efficiently, and therefore the rotating electric machine 100 and drive unit 200 of the present disclosure can be manufactured at low cost.

[0021] <2. Rotor> Next, a detailed description will be given of the rotor 10. The rotor 10 is used in an inner rotor type rotating electric machine 100. The rotor 10 has a plurality of magnetic poles in the circumferential direction centered on a central axis A that extends in the vertical direction.

[0022] (2-1. First embodiment) 2 is a perspective view showing a schematic configuration of the rotor 10 of the first embodiment. As shown in FIG. 2, the rotor 10 has a magnet 11, a rotor core 12, and a resin 13.

[0023] The magnets 11 constitute each magnetic pole. In this embodiment, the rotor 10 has eight magnetic poles. The rotor 10 has a magnet 11 that constitutes each of the eight magnetic poles. The magnets 11 are disposed on the radially outer periphery of the rotor core 12. The magnets 11 are permanent magnets for a field magnet, and may be, for example, a sintered magnet or a bonded magnet. The number of magnetic poles of the rotor 10 may be any number other than eight.

[0024] Rotor core 12 is cylindrical and centered on central axis A. Rotor core 12 is formed by stacking magnetic steel plates in the axial direction. The magnetic steel plates are, for example, silicon steel plates. Rotor core 12 has an insertion hole 12a that passes through in the axial direction at the center. Shaft 30 (see FIG. 1) is inserted into insertion hole 12a. That is, rotor core 12 has insertion hole 12a through which shaft 30 passes.

[0025] Furthermore, rotor core 12 has accommodating holes 12b extending in the axial direction that accommodate magnets 11. Accommodating holes 12b are arranged on the radially outer periphery of rotor core 12. Accommodating holes 12b accommodate magnets 11 that constitute each magnetic pole. A plurality of accommodating holes 12b are arranged at intervals in the circumferential direction. In this embodiment, since there are eight magnetic poles, there are also eight accommodating holes 12b arranged at positions. The eight accommodating holes 12b are arranged at equal intervals in the circumferential direction.

[0026] Resin 13 is poured into accommodating hole 12b. More specifically, resin 13 is placed in accommodating hole 12b other than the portion where magnet 11 is placed. Resin 13 is poured into each of the multiple accommodating holes 12b. Resin 13 fixes magnet 11 placed in accommodating hole 12b to rotor core 12. Resin 13 may be, for example, epoxy resin.

[0027] Specifically, the rotor core 12 of the rotor 10 configured as above is divided into a plurality of blocks arranged in the axial direction. The rotor core 12 has a first block 121 and a second block 122. The second block 122 is arranged in the axial direction together with the first block 121, and the position of the accommodating hole 12b is shifted with respect to the first block 121. That is, the first block 121 and the second block 122 are skewed and arranged to have a phase angle in the circumferential direction. By adopting such a skewed configuration, it is possible to suppress cogging torque.

[0028] Since the rotor core 12 is divided into a plurality of blocks and the blocks are skewed, the magnets 11 constituting each magnetic pole are also divided into a plurality of magnets. Also, the accommodating holes 12b for accommodating the magnets 11 provided corresponding to each magnetic pole are also provided for each block. The accommodating holes 12b penetrate each block in the axial direction.

[0029] Fig. 3 is a schematic plan view showing an enlarged portion of a first block 121 included in the rotor core 12 of the first embodiment. Fig. 4 is a schematic plan view showing an enlarged portion of a second block 122 included in the rotor core 12 of the first embodiment. Fig. 5 is a schematic perspective view showing an enlarged portion of the first block 121 and the second block 122 included in the rotor core 12 of the first embodiment when viewed obliquely from above. Note that the accommodating hole 12b shown by the dashed line in Fig. 4 is an accommodating hole included in the first block 121. Also, in Fig. 5, the second block 122 is disposed above the first block 121.

[0030] As shown in FIGS. 4 and 5, in each magnetic pole, the accommodation holes 12b of the first block 121 and the accommodation holes 12b of the second block 122 are skewed, so that they are shifted in the circumferential direction and partially overlap in the axial direction.

[0031] 3 to 5, the first block 121 and the second block 122 each have a resin groove 14 that communicates with the accommodating holes 12b of the blocks 121 and 122, extends from the upper end to the lower end in the axial direction, and receives the resin 13. That is, the first block 121 has a plurality of resin grooves 14 that communicate with the accommodating holes 12b of the first block 121 and extends from the upper end to the lower end in the axial direction. The second block 122 has a plurality of resin grooves 14 that communicate with the accommodating holes 12b of the second block 122 and extends from the upper end to the lower end in the axial direction. The resin grooves 14 are grooves used to inject the molten resin 13 into the accommodating holes 12b during the manufacture of the rotor 10.

[0032] The resin grooves 14 of the first block 121 and the resin grooves 14 of the second block 122 are connected while at least partially overlapping in the axial direction. With this configuration, when manufacturing the rotor 10 having the skewed rotor core 12, the multiple blocks 121, 122 can be stacked in the axial direction and resin can be appropriately injected all at once into the accommodating holes 12b of the magnets 11 of each block 121, 122. In other words, the manufacturing efficiency of the rotor 10 having the skewed rotor core 12 can be improved.

[0033] 5, in this embodiment, the resin grooves 14 of the first block 121 and the resin grooves 14 of the second block 122 are mostly overlapped and connected in the axial direction. Therefore, with the first block 121 and the second block 122 overlapped in the axial direction, the resin 13 can be efficiently flowed to fill the accommodation hole 12b.

[0034] In the present embodiment, as a preferred embodiment, the first block 121 and the second block 122 have a mark Ma for aligning their circumferential positions. When the mark Ma provided on the first block 121 and the mark Ma provided on the second block 122 are aligned in the circumferential direction, the first block 121 and the second block 122 are misaligned in the circumferential direction as designed, resulting in a properly skewed arrangement.

[0035] As a preferred embodiment, the inner surface of the insertion hole 12a is provided with an insertion hole side convex portion 1211 that fits with a shaft side concave portion that is recessed in the radial direction and provided on the shaft 30. The insertion hole side convex portion 1211 protrudes radially inward from the inner surface of the insertion hole 12a. The insertion hole side convex portion 1211 may be the mark Ma. However, the inner surface of the insertion hole 12a may be provided with an insertion hole side concave portion that fits with a shaft side convex portion that protrudes in the radial direction and provided on the shaft 30, and the insertion hole side concave portion may be the mark Ma.

[0036] That is, the inner surface of the insertion hole 12a may be provided with an insertion hole side convex portion or concave portion that fits with a shaft side concave portion that is recessed in the radial direction or a shaft side convex portion that protrudes in the radial direction provided on the shaft 30, and the mark Ma may be the insertion hole side convex portion or concave portion. This allows the structure provided to prevent relative rotation between the shaft 30 and the rotor core 12 to be used as the mark Ma, eliminating the need to provide a special mark Ma for circumferential alignment.

[0037] In the present embodiment, as a preferred embodiment, the second block 122 is the first block 121 that is upside down in the axial direction and is arranged so that the circumferential positions of the marks Ma are aligned with those of the first block 121. According to this configuration, the first block 121 and the second block 122 that constitute the rotor core 12 can be formed using the same mold, and the manufacturing cost of the rotor 10 can be reduced.

[0038] The fact that the first block 121, which is turned upside down in the axial direction, becomes the second block 122 when the first block 121 and the mark Ma are aligned in the circumferential direction will be described in further detail mainly with reference to Figures 3, 4 and 6. Note that Figure 6 is a schematic bottom view showing an enlarged portion of the first block 121 of the rotor core 12 of the first embodiment. Figure 6 is a bottom view focusing on the same receiving hole 12b as Figure 3.

[0039] The magnet 11 includes a first magnet F11 that extends in a direction parallel to the tangent direction of the rotor core 12. More specifically, the magnet 11 is composed of only the first magnet F11. The first magnet F11 has a rectangular parallelepiped shape. That is, the first magnet F11 has a rectangular shape when viewed from the axial direction.

[0040] The accommodating hole 12b includes a first magnet accommodating hole F12b that accommodates the first magnet F11. More specifically, the accommodating hole 12b is composed only of the first magnet accommodating hole F12b. The first magnet accommodating hole F12b extends in a direction parallel to the tangential direction, similar to the first magnet F11. The first magnet accommodating hole F12b is substantially trapezoidal in a plan view from the axial direction, and is longer in the direction parallel to the tangential direction than the first magnet F11.

[0041] The resin groove 14 includes a first resin groove F14 that is recessed radially from the inner surface of the first magnet accommodating hole F12b. In detail, the resin groove 14 is composed of only the first resin groove F14. In a configuration having the first magnet accommodating hole F12b and the first resin groove F14, a configuration in which the first block 121 is turned upside down and used as the second block 122 can be formed with a simple structure.

[0042] In this embodiment, as a preferred embodiment, the first resin groove F14 is disposed radially inward from the first magnet F11. With this configuration, when the resin 13 is injected into the first magnet accommodating hole F12b, the flow of the resin 13 can press the first magnet F11 against the radially outward inner surface of the first magnet accommodating hole F12b, improving the magnetic properties. Also, the resin groove 14 for injecting the resin 13 can be provided at a position that is unlikely to affect the magnetic properties.

[0043] FIG. 7 is a plan view showing a schematic relationship between the first magnet F11 and the first resin groove F14 arranged in the first magnet accommodating hole F12b. As shown in FIG. 7, in a preferred embodiment, in a plan view from the axial direction, the maximum width D1 of the first resin groove F14 in a direction parallel to the tangential direction of the rotor core 12 is greater than the shortest radial distance D2 between the inner surface of the first magnet accommodating hole F12b on the radial inner side and the first magnet F11. According to this configuration, when the resin 13 is injected into the first magnet accommodating hole F12b, the resin 13 passes through the first resin groove F14 and easily spreads to the top and bottom of the rotor core 12. Therefore, in each of the blocks 121 and 122, the position of the first magnet F11 accommodated in the first magnet accommodating hole F12b can be appropriately arranged by the flowing resin 13. It is preferable that the shortest distance D2 is about half or less than half of the maximum width D1.

[0044] In a preferred embodiment, the first resin groove F14 is semicircular in plan view from the axial direction. In this case, the maximum width D1 of the first resin groove F14 in a direction parallel to the tangent direction of the rotor core 12 is equal to the diameter of the first resin groove F14. This configuration makes it possible to minimize the area where the first resin groove F14 is provided, while ensuring the amount of resin 13 injected into the first magnet accommodating hole F12b. By minimizing the area where the first resin groove F14 is provided, the effect of providing the first resin groove F14 on the magnetic properties can be suppressed.

[0045] As shown in Fig. 3 and Fig. 6, in a plan view from the axial direction, the position of the first resin groove F14 is shifted from the center position of the first magnet accommodating hole F12b in a direction parallel to the tangent direction of the rotor core 12. In Fig. 3 and Fig. 6, the dashed line L1 is a line connecting the center axis A and the center position of the first magnet accommodating hole F12b in a direction parallel to the tangent direction of the rotor core 12. In addition, the dashed line L2 is a line connecting the center axis A and a specific point of the first resin groove F14. The specific point is, for example, the point located most radially inward of the first resin groove F14. Note that the mark Ma (insertion hole side protrusion 1211) provided for circumferential alignment is provided at a position through which the dashed line L2 passes.

[0046] As described above, since the position of the first resin groove F14 and the mark Ma are offset from the center position of the first magnet accommodating hole F12b, the dashed line L2 is offset by θ degrees in the clockwise direction from the dashed dotted line L1 in Fig. 3, which shows the first block 121 in a plan view from above. Also, in Fig. 6, which shows the first block 121 in a plan view from below, the dashed line L2 is offset by θ degrees in the counterclockwise direction from the dashed dotted line L1.

[0047] For this purpose, the first block 121 is placed on the first block 121 with the axially inverted top and bottom, and rotated clockwise by 2θ degrees to align the circumferential positions of the marks Ma. Then, as shown in Fig. 5, the first block 121 and the second block 122 are arranged in a skewed manner with the circumferential positions of the first resin grooves F14 provided in each of them aligned. That is, by arranging the positions of the first resin grooves F14 to be shifted from the center positions of the first magnet accommodating holes F12b, the first block 121 can be turned upside down to obtain a configuration that forms the second block 122, and manufacturing costs can be reduced.

[0048] FIG. 8 is a side view showing a rotor 10 according to the first embodiment. In FIG. 8, a thick line MC indicates the center position of the magnetic poles of the blocks 121 and 122 when focusing on a certain magnetic pole of the rotor 10. As shown in FIG. 2 and FIG. 8, in this embodiment, the first block 121 and the second block 122 are arranged in contact with each other in the axial direction. With this configuration, it is possible to manufacture a skewed rotor core 12 having, for example, three or four blocks at low cost. In this embodiment, the number of blocks constituting the rotor core 12 is four.

[0049] 8, a block set in which a first block 121 and a second block 122 are arranged in contact with each other in the axial direction is arranged symmetrically with respect to a bisecting plane SC1 that bisects rotor core 12 in the axial direction. In this embodiment, when manufacturing rotor core 12 having four blocks and being skewed, the number of dies for forming the blocks can be reduced to one, and rotor 10 can be manufactured at low cost.

[0050] In this embodiment, the first resin grooves F14 provided in each of the four blocks constituting the rotor core 12 overlap and communicate with each other in the axial direction. That is, with the four blocks stacked in the axial direction, the resin 13A can be appropriately injected into the first magnet accommodating holes F12b of each block all at once.

[0051] As shown in Fig. 3 and Fig. 4, each of the first block 121 and the second block 122 has a positioning protrusion 15 on the inner surface of the accommodation hole 12b, which determines the longitudinal position of the magnet 11 in plan view from the axial direction. In detail, a pair of positioning protrusions 15 protruding radially outward is provided on the radially inner surface of the first magnet accommodation hole F12b. In plan view from the axial direction, the pair of positioning protrusions 15 contact both ends of the first magnet F11 in the longitudinal direction, suppressing the movement of the first magnet F11 in the longitudinal direction. That is, the first magnet F11 can be positioned at an appropriate position.

[0052] In a preferred embodiment, in the axial direction of the accommodating hole 12b of each of the blocks 121, 122, the area where the positioning protrusions 15 are present is smaller than the area where the positioning protrusions 15 are absent. According to this configuration, while the positioning protrusions 15 are formed on the inner surface of the accommodating hole 12b to position the magnet 11, the formation area of ​​the positioning protrusions 15 in each of the blocks 121, 122 is made as small as possible, making it possible to prevent the flow of the resin 13 from being impeded when the resin 13 is injected into the accommodating hole 12b.

[0053] To achieve this configuration, for example, a first magnetic steel plate 120A and a second magnetic steel plate 120B may be used as the multiple magnetic steel plates that make up each block 121, 122. Fig. 9A is a plan view that typically shows the configuration of the first magnetic steel plate 120A. Fig. 9B is a plan view that typically shows the configuration of the second magnetic steel plate 120B.

[0054] 9A, in the first magnetic steel plate 120A, a convex portion 150 constituting the positioning convex portion 15 is formed in an accommodating hole constituent portion 1201 constituting the accommodating hole 12b in which the magnet 11 is accommodated. On the other hand, as shown in FIG 9B, in the second magnetic steel plate 120B, the convex portion 150 constituting the positioning convex portion 15 is not provided in the accommodating hole constituent portion 1201 constituting the accommodating hole 12b in which the magnet 11 is accommodated.

[0055] FIG. 10 is a diagram showing a schematic image of the magnetic steel plates of the blocks 121 and 122 formed by using the first magnetic steel plate 120A and the second magnetic steel plate 120B. As shown in FIG. 10, in the axial direction, the portion where the convex portion 150 is located is the presence region R1 of the positioning convex portion 15, and the portion where the convex portion 150 is not present is the absence region R2 of the positioning convex portion 15. In each block 121 and 122, the number of stacked second magnetic steel plates 120B is made larger than the number of stacked first magnetic steel plates 120A. As a result, in the axial direction of the receiving hole 12b of each block 121 and 122, the presence region R1 of the positioning convex portion 15 can be configured to be smaller than the absence region R2 of the positioning convex portion 15.

[0056] (2-2. Second embodiment) Next, a rotor 10A according to a second embodiment will be described. In describing the second embodiment, descriptions of contents that overlap with the first embodiment will be omitted as much as possible.

[0057] Fig. 11 is a perspective view showing a schematic configuration of a rotor 10A according to the second embodiment. As shown in Fig. 11, the rotor 10A according to the second embodiment has magnets 11A constituting each magnetic pole, a rotor core 12A having an accommodating hole 12Ab for accommodating the magnet 11A, and a resin 13A filled in the accommodating hole 12Ab, similar to the first embodiment.

[0058] In the second embodiment, the rotor 10A has eight magnetic poles as in the first embodiment, and the rotor 10A has magnets 11A that respectively configure the eight magnetic poles. In this embodiment, the magnets 11A further include a pair of second magnets S11A that are paired together to configure a V-shape in a plan view from the axial direction. That is, the magnets 11A that configure each magnetic pole include a first magnet F11A and a pair of second magnets S11A.

[0059] The first magnet F11A has the same configuration as the first magnet F11 of the first embodiment, so a description thereof will be omitted here. The pair of second magnets S11A are arranged symmetrically with respect to a line extending radially from the central axis A. The pair of second magnets S11A are arranged such that the circumferential distance between them narrows as they move radially inward. At least a portion of the first magnet F11A is arranged radially outward from the pair of second magnets S11A. The magnets 11A are arranged in a so-called ∇-shape. Each second magnet S11A is cuboid-shaped and rectangular in plan view from the axial direction.

[0060] In the second embodiment, rotor core 12A is also cylindrical about central axis A and has an insertion hole 12Aa in the center for inserting shaft 30 (see FIG. 1). Rotor core 12A has a first block 121A and a second block 122A that is arranged in the axial direction together with first block 121A and has an accommodating hole 12Ab positioned offset relative to first block 121A. That is, first block 121A and second block 122A are skewed.

[0061] Also in the second embodiment, when the first block 121A is turned upside down in the axial direction and arranged so that the circumferential positions of the first block 121A and the mark Ma are aligned, it becomes the second block 122A. As in the first embodiment (see FIG. 8), a block pair in which the first block 121A and the second block 122A are arranged in contact with each other in the axial direction is arranged line-symmetrically with respect to the bisection plane SC1 that bisects the rotor core 12A in the axial direction.

[0062] Fig. 12 is a schematic plan view showing the configuration of the first block 121A of the rotor core 12A of the second embodiment. The second block 122A is obtained by turning the first block 121A upside down, and therefore a detailed description of the configuration is omitted. As shown in Fig. 12, the accommodating hole 12Ab further includes a pair of second magnet accommodating holes S12Ab that accommodate a pair of second magnets S11A. That is, the accommodating hole 12Ab includes a first magnet accommodating hole F12Ab and a pair of second magnet accommodating holes S12Ab.

[0063] The first magnet accommodating hole F12Ab has the same configuration as the first magnet accommodating hole F12b of the first embodiment, so a description thereof will be omitted here. The pair of second magnet accommodating holes S12Ab are paired to form a V-shape in plan view from the axial direction. In detail, the pair of second magnet accommodating holes S12Ab are arranged such that the circumferential distance between them narrows as they move radially inward. In plan view from the axial direction, each second magnet accommodating hole S12Ab is longer than the length of the second magnet S11A in a direction parallel to the longitudinal direction of the accommodated second magnet S11A. In addition, each second magnet accommodating hole S12Ab is preferably provided with a positioning protrusion that determines the longitudinal position of the second magnet S11A, similar to the first magnet accommodating hole F12Ab.

[0064] The first block 121A has a resin groove 14A that communicates with the accommodation hole 12Ab, extends from the upper end to the lower end in the axial direction, and receives the resin 13A. The resin groove 14A further includes a second resin groove S14A that is recessed in the circumferential direction from the inner surface of each of the pair of second magnet accommodation holes S12Ab. That is, the resin groove 14A includes a first resin groove F14A and a second resin groove S14A. The first resin groove F14A has the same configuration as the first resin groove F14 in the first embodiment, and therefore a description thereof is omitted here. The second resin groove S14A extends from the upper end to the lower end of the first block 121A. The second resin groove S14A will be described in detail later.

[0065] The first resin groove F14A of the first block 121A and the first resin groove F14A of the second block 122A can be configured to be at least partially overlapped in the axial direction and communicate with each other, as in the first embodiment. The second resin groove S14A of the first block 121A and the second resin groove S14A of the second block 122A can also be configured to be at least partially overlapped in the axial direction and communicate with each other. For this reason, even if the magnets 11A constituting each magnetic pole are composed of multiple ∇-shaped magnets, the multiple blocks 121A and 122A can be stacked in the axial direction, and resin can be appropriately injected all at once into the accommodation holes 12Ab of the magnets 11A of each block 121A and 122A.

[0066] 12, the outer edge of the second magnet accommodating hole S12Ab has a first outer edge portion OE1 and a second outer edge portion OE2 that face each other in the short side direction of the second magnet S11A when viewed from the axial direction. In this embodiment, the outer edge of the second magnet accommodating hole S12Ab is rectangular. The first outer edge portion OE1 and the second outer edge portion OE2 are linear.

[0067] The first outer edge portion OE1 is disposed radially inward from the second outer edge portion OE2. The second resin groove S14A is provided on an inner surface extending in the axial direction from the first outer edge portion OE1. The second resin groove S14A is recessed from the inner surface extending in the axial direction from the first outer edge portion OE1, and extends from the upper end to the lower end in the axial direction. According to this configuration, when the resin 13A is injected into the second magnet accommodating hole S12Ab, the second magnet S11A can be pressed against the inner surface extending in the axial direction from the second outer edge portion OE2 by the flow of the resin 13. That is, according to this configuration, the second magnet S11A can be pressed against the inner surface extending in the axial direction from the second outer edge portion OE2, which is radially outward, and the magnetic characteristics can be improved.

[0068] In this embodiment, the second resin groove S14A is provided in the center of the first outer edge portion OE1 in a direction parallel to the longitudinal direction of the second magnet S11A in a plan view from the axial direction. However, the position where the second resin groove S14A is provided may be a position shifted from the above-mentioned center. In addition, the pair of second magnet accommodating holes S12Ab are arranged line-symmetrically with respect to a line extending radially from the central axis A in a plan view from the axial direction. For this reason, the second resin groove S14A is recessed from the inner surface of the second magnet accommodating hole S12Ab in the opposite circumferential directions between one and the other of the pair of second magnet accommodating holes S12Ab.

[0069] The second resin grooves S14A provided in each of the pair of second magnet accommodating holes S12Ab may be line-symmetrical in a plan view from the axial direction, similar to the pair of second magnet accommodating holes S12Ab, but they do not have to be line-symmetrical. In this embodiment, the configuration is not line-symmetrical. The second resin grooves S14A may be configured to be provided on an inner surface extending in the axial direction from the second outer edge portion OE2, instead of an inner surface extending in the axial direction from the first outer edge portion OE1.

[0070] The second resin groove S14A provided in the first block 121A will be described in more detail. In a plan view from the axial direction, it is preferable that the length W2 in the perpendicular direction is longer than the width W1 in the direction parallel to the longitudinal direction of the second magnet S11A at least at either the upper end or the lower end of the second resin groove S14A in the axial direction (see FIG. 12). By configuring the second resin groove S14A to extend long in the circumferential direction in this way, it is possible to easily communicate with the second resin groove S14A of other blocks that are skewed and stacked in the axial direction, and resin can be appropriately injected all at once with the blocks stacked.

[0071] The second resin groove S14A provided in the first block 121A may be configured to extend circumferentially from the upper end to the lower end in the axial direction as described above. However, in this embodiment, the second resin groove S14A does not extend circumferentially from the upper end to the lower end. This will be described below.

[0072] The rotor core 12A is formed by stacking magnetic steel plates in the axial direction. That is, the first block 121A and the second block 122A are formed by stacking magnetic steel plates in the axial direction. In the first block 121A and the second block 122A, the end magnetic steel plates 120C, which are the magnetic steel plates at the axial upper and lower ends, and the middle magnetic steel plate 120D, which is the magnetic steel plate arranged axially between the end magnetic steel plates 120C at the axial upper and lower ends, have different shapes of groove portions 140 (see FIG. 13A and the like described later) that form the second resin groove S14A.

[0073] In this embodiment, the number of intermediate magnetic steel plates 120D is plural. Hereinafter, the end magnetic steel plate 120C at the upper end in the axial direction may be referred to as the upper end magnetic steel plate 120CU. Also, the end magnetic steel plate 120C at the lower end in the axial direction may be referred to as the lower end magnetic steel plate 120CL.

[0074] Fig. 13A is a schematic plan view showing a partial configuration of the upper end magnetic steel plate 120CU. Fig. 13B is a schematic plan view showing a partial configuration of the lower end magnetic steel plate 120CL. Fig. 13C is a schematic plan view showing a partial configuration of the middle magnetic steel plate 120D. In Fig. 13A to Fig. 13C, reference numeral 1202 denotes a second magnet accommodating hole component constituting the second magnet accommodating hole S12Ab formed by laminating magnetic steel plates.

[0075] As shown in Fig. 13A, in the upper end magnetic steel plate 120CU, the groove 140 provided in one of the pair of second magnet accommodating hole constituent parts 1202 is an elongated groove 140a extending long in the circumferential direction. The elongated groove 140a has a length W2 in the perpendicular direction longer than a width W1 in a direction parallel to the longitudinal direction of the second magnet S11A accommodated in the second magnet accommodating hole S12Ab. The width W1 and length W2 are defined in the same way as in Fig. 12.

[0076] On the other hand, in the upper end magnetic steel plate 120CU, the groove 140 provided in the other of the pair of second magnet accommodating hole constituent parts 1202 is a short groove part 140b. The short groove part 140b has a width W1 in a direction parallel to the longitudinal direction of the second magnet S11A accommodated in the second magnet accommodating hole S12Ab, which is equal to the length W2 in the perpendicular direction. In this embodiment, the short groove part 140b has a semicircular shape in a plan view from the axial direction. In the upper end magnetic steel plate 120CU, the long groove part 140a provided in one of the pair of second magnet accommodating hole constituent parts 1202 and the short groove part 140b provided in the other are arranged at intervals in the circumferential direction.

[0077] As shown in FIG. 13B, in the intermediate magnetic steel plate 120D, a short groove portion 140b is provided in each of a pair of second magnet accommodating hole constituent portions 1202. The two short groove portions 140b are arranged at an interval in the circumferential direction. The short groove portion 140b provided in the intermediate magnetic steel plate 120D and the short groove portion 140b provided in the upper end magnetic steel plate 120CU have the same shape and size. In addition, the radial position at which the short groove portion 140b provided in the intermediate magnetic steel plate 120D is provided is the same as the radial position of the long groove portion 140a and the short groove portion 140b provided in the upper end magnetic steel plate 120CU. That is, the short groove portion 140b provided in the intermediate magnetic steel plate 120D and the long groove portion 140a and the short groove portion 140b provided in the upper end magnetic steel plate 120CU overlap in the axial direction.

[0078] As shown in FIG. 13C, in the lower end magnetic steel plate 120CL, the groove 140 provided in one of the pair of second magnet accommodating hole constituent parts 1202 is a short groove 140b. The groove 140 provided in the other of the pair of second magnet accommodating hole constituent parts 1202 is an elongated groove 140a. That is, the configurations of the grooves 140 provided in one and the other of the pair of second magnet accommodating hole constituent parts 1202 are reversed between the lower end magnetic steel plate 120CL and the upper end magnetic steel plate 120CU. The configurations of the elongated groove 140a and the short groove 140b provided in the lower end magnetic steel plate 120CL are the same as those of the upper end magnetic steel plate 120CU, except that the grooves 140 are provided in one and the other of the pair of second magnet accommodating hole constituent parts 1202 are reversed.

[0079] When the upper end magnetic steel plate 120CU, the intermediate magnetic steel plate 120D laminated in the axial direction, and the lower end magnetic steel plate 120CL are arranged from top to bottom to form the first block 121A, at least a part of the grooves 140 provided in each magnetic steel plate are aligned in the axial direction. The second resin groove S14A extends from the upper end to the lower end of the first block 121A.

[0080] As can be seen from the above description, in this embodiment, the end magnetic steel plate 120C has a groove portion 140 that extends longer in the circumferential direction than the groove portion 140 of the middle magnetic steel plate 120D. With this configuration, it is possible to ensure communication with the second resin groove S14A of other blocks that are skewed and stacked in the axial direction, and it is possible to minimize the area in which the second resin groove S14A is provided in the block. In other words, with this configuration, it is possible to facilitate the injection of the resin 13A into the second magnet accommodating hole S12Ab in the skewed rotor core 12A, and it is possible to suppress the effect on the magnetic properties due to the provision of the second resin groove S14A.

[0081] The upper end magnetic steel plate 120CU and the lower end magnetic steel plate 120CL may have the same configuration of the grooves 140 provided in the pair of second magnet accommodating hole constituent portions 1202. That is, in the upper end magnetic steel plate 120CU and the lower end magnetic steel plate 120CL, the grooves 140 provided in the pair of second magnet accommodating hole constituent portions 1202 may all be elongated grooves 140a.

[0082] Fig. 14 is a diagram showing a schematic configuration of a cross section of a part of a block set in which a first block 121A and a second block 122A of a rotor core 12A according to the second embodiment are stacked in the axial direction. As shown in Fig. 14, the second resin groove S14A of the first block 121 and the second resin groove S14A of the second block 122A partially overlap and communicate with each other in the axial direction.

[0083] In the present embodiment, rotor core 12A is configured such that a block set in which first block 121A and second block 122A are arranged in contact with each other in the axial direction is arranged symmetrically with respect to a bisecting plane SC1 that bisects rotor core 12A in the axial direction (see FIG. 8). Therefore, the second resin grooves S14A provided in each of the four blocks also partially overlap and communicate with each other in the axial direction. In other words, with the four blocks overlapped in the axial direction, resin 13A can be appropriately injected all at once into the second magnet housing holes S12Ab of each block.

[0084] (2-3. Modifications) Modified examples of the rotors 10 and 10A will be described below.

[0085] [2-3-1. First modified example] In the configuration of the second embodiment, the first magnet F11A and the first magnet accommodating hole F12Ab may not be provided. Also, for example, instead of the first magnet F11A and the first magnet accommodating hole F12Ab, a magnet and a magnet accommodating hole similar to the pair of second magnets S11A and the pair of second magnet accommodating holes S12Ab may be arranged. In other words, the technology of the present disclosure can be widely applied to a configuration in which the magnets constituting each magnetic pole include a pair of second magnets constituting a V-shape.

[0086] [2-3-2. Second modified example] In the configuration of the second embodiment, instead of the pair of second magnets S11A and the pair of second magnet accommodating holes S12Ab, a magnet and a magnet accommodating hole having a configuration similar to that of the first magnet F11A and the first magnet accommodating hole F12Ab may be arranged.

[0087] [2-3-3.Third modified example] In the above, the case where the number of blocks constituting rotor cores 12, 12A is four has been described. However, the number of blocks including first blocks 121, 121A and second blocks 122, 122A may be three or five or more.

[0088] The rotor core may have at least one block disposed between the first block 121, 121A and the second block 122, 122A in the axial direction, and the positions of the magnetic poles of the rotor core may be configured to be line-symmetrical with respect to a plane that bisects the rotor core in the axial direction. Even in such a configuration, the resin grooves 14, 14A of the first block 121, 121A and the resin grooves 14, 14A of the second block 122, 122A may be connected to each other by at least partially overlapping in the axial direction, or may be connected via a resin groove of at least one other block disposed between the first block 121, 121A and the second block 122, 122A in the axial direction. That is, according to this configuration, a rotor having a rotor core in which, for example, five, six, eight, or the like blocks are arranged in a skewed manner can be manufactured at low cost.

[0089] Fig. 15 is a diagram showing an example of the configuration of rotor 10B in which rotor core 12B is composed of five blocks including first blocks 121 and 121A and second blocks 122 and 122A. In Fig. 15, thick lines MC indicate the center positions of the magnetic poles of each block when focusing on a certain magnetic pole of rotor 10B.

[0090] 15, first blocks 121, 121A are arranged at the center in the axial direction. A third block 123, second blocks 122, 122A are arranged, in order from bottom, above first blocks 121, 121A arranged at the center. In addition, a third block 123, second blocks 122, 122A are arranged, in order from top, below first blocks 121, 121A arranged at the center. The positions of the magnetic poles of rotor core 12B are arranged line-symmetrically with respect to a bisection plane SC2 that bisects rotor core 12B in the axial direction.

[0091] The third block 123 has a different configuration from the first blocks 121, 121A and the second blocks 122, 122A. For example, when the first block and the second block are the first block 121 and the second block 122 of the first embodiment, the position of the first resin groove F14 provided in the third block 123 may be the center position of the first magnet accommodating hole F12b in a plan view from the axial direction. With this configuration, in the rotor core 12B having a skew structure, at least a portion of the resin grooves of the five blocks can be configured to overlap in the axial direction.

[0092] Fig. 16 is a diagram showing an example of the configuration of a rotor 10C in which a rotor core 12C is composed of eight blocks including first blocks 121 and 121A and second blocks 122 and 122A. In Fig. 16, a thick line MC indicates the center position of the magnetic pole of each block when focusing on a certain magnetic pole of the rotor 10C.

[0093] 16, a set of blocks arranged in the order of first block 121, 121A, fourth block 124, fifth block 125, second block 122, 122A from the bottom are arranged line-symmetrically with respect to bisection plane SC3 that bisects rotor core 12C in the axial direction. In this case as well, the positions of the magnetic poles of rotor core 12C are arranged line-symmetrically with respect to bisection plane SC3 that bisects rotor core 12B in the axial direction.

[0094] The fourth block 124 and the fifth block 125 have a different configuration from the first blocks 121, 121A and the second blocks 122, 122A. In this configuration, the fourth block 124 and the fifth block 125 may be configured to be shared by being upside down, like the first blocks 121, 121A and the second blocks 122, 122A.

[0095] <3. Notes> Various technical features disclosed in this specification may be modified in various ways without departing from the spirit of the technical creation. Furthermore, multiple embodiments and modifications shown in this specification may be combined to the extent possible. [Industrial Applicability]

[0096] The technology disclosed herein can be used in, for example, home appliances, automobiles, ships, aircraft, trains, power-assisted bicycles, wind power generators, and the like. [Explanation of symbols]

[0097] 10, 10A, 10B, 10C...Rotor 11, 11A... Magnet 12, 12A, 12B, 12C...Rotor core 12a, 12Aa... Insertion hole 12b, 12Ab...housing hole 13, 13A... Resin 14, 14A... Plastic groove 15 Positioning protrusion 20. Stator 30 Shaft 100 Rotating electric motor 101 Gear unit 120C...End magnetic steel plate 120D...Intermediate magnetic steel plate 121, 121A... 1st block 122, 122A...Second block 123···3rd Block (other blocks) 124···4th block (other blocks) 125···5th Block (other blocks) 140 Groove 200 Drive unit 1211....Through hole side protrusion A...Center axis F11, F11A...First magnet F12b, F12Ab...First magnet housing hole F14, F14A...First resin groove Ma...Mark OE1: First outer edge OE2: Second outer edge R1...existence area R2...absent area S11, S11A...Second magnet S12Ab...Second magnet housing hole S14A...Second resin groove SC1, SC2, SC3...Bisector surface

Claims

1. A rotor used in an inner rotor type rotating electric machine, the rotor having a plurality of magnetic poles in a circumferential direction around a central axis extending vertically, A magnet constituting each of the magnetic poles; a rotor core having an axially extending receiving hole for receiving the magnet; A resin to be placed in the receiving hole; having The rotor core is A first block; a second block arranged in the axial direction together with the first block, the second block being arranged such that the circumferential position of the accommodation hole is shifted with respect to the first block; having the first block and the second block each have a resin groove extending from an upper end to a lower end in the axial direction, communicating with the accommodation hole of each block, and into which the resin is poured; the resin groove of the first block and the resin groove of the second block are connected to each other while at least a part of the resin groove of the first block overlaps with each other in the axial direction, or are connected to each other via the resin groove of at least one other block that is disposed between the first block and the second block in the axial direction, A rotor, in which, when viewed from above in the axial direction, the resin groove has a length in a direction perpendicular to the longitudinal direction of the magnet that is longer than its width in a direction parallel to the longitudinal direction of the magnet at least at either the upper or lower axial end.

2. the first block and the second block have marks for aligning their positions in the circumferential direction, 2 . The rotor according to claim 1 , wherein the second block is the first block that is upside down in the axial direction and has an arrangement in which the marks are aligned with those of the first block in the circumferential direction.

3. The rotor core further has an insertion hole through which a shaft is inserted, an inner surface of the insertion hole is provided with an insertion hole side convex portion or a concave portion that fits with a shaft side concave portion that is recessed in a radial direction or a shaft side convex portion that protrudes in a radial direction, the shaft being provided on the shaft; The rotor according to claim 2 , wherein the mark is a protrusion or recess on the insertion hole side.

4. each of the first block and the second block has a positioning protrusion on an inner surface of the accommodating hole for determining a longitudinal position of the magnet in a plan view from the axial direction; 4. The rotor according to claim 1, wherein an area where the positioning protrusions are present is smaller than an area where the positioning protrusions are absent in an axial direction of the receiving hole of each block.

5. A rotor used in an inner rotor type rotating electric machine, the rotor having a plurality of magnetic poles in a circumferential direction around a central axis extending vertically, A magnet constituting each of the magnetic poles; a rotor core having an axially extending receiving hole for receiving the magnet; A resin to be placed in the receiving hole; having The rotor core is A first block; a second block arranged in the axial direction together with the first block, the second block being arranged such that the circumferential position of the accommodation hole is shifted with respect to the first block; having the first block and the second block each have a resin groove that communicates with the receiving hole of each block, extends from an upper end to a lower end in the axial direction, and receives the resin; the resin groove of the first block and the resin groove of the second block are connected to each other while at least a part of the resin groove of the first block overlaps with each other in the axial direction, or are connected to each other via the resin groove of at least one other block that is disposed between the first block and the second block in the axial direction, The magnet includes a first magnet extending in a direction parallel to a tangent direction of the rotor core, The accommodation hole includes a first magnet accommodation hole that accommodates the first magnet, the resin groove includes a first resin groove recessed in a radial direction from an inner surface of the first magnet accommodating hole, A rotor, wherein, in a plan view from the axial direction, a position of the first resin groove is shifted from a center position of the first magnet accommodating hole in a direction parallel to the tangent direction.

6. The rotor according to claim 5 , wherein the first resin groove is disposed radially inward from the first magnet.

7. The rotor according to claim 6, wherein, when viewed in a plan view from the axial direction, the maximum width of the first resin groove in a direction parallel to the tangential direction is greater than the shortest radial distance between the radially inner inner surface of the first magnet accommodating hole and the first magnet.

8. The rotor according to claim 5 , wherein the first resin groove is semicircular in a plan view from the axial direction.

9. The magnet includes a pair of second magnets that are paired to form a V-shape when viewed in a plan view from the axial direction, the accommodation hole includes a pair of second magnet accommodation holes that accommodate the pair of second magnets, The rotor according to claim 1 , wherein the resin grooves include second resin grooves recessed in a circumferential direction from inner surfaces of the pair of second magnet accommodating holes.

10. The magnet further includes a pair of second magnets that are paired to form a V-shape when viewed in a plan view from the axial direction, The accommodation hole further includes a pair of second magnet accommodation holes that accommodate the pair of second magnets, The resin groove further includes a second resin groove recessed in a circumferential direction from an inner surface of each of the pair of second magnet accommodating holes, The rotor according to claim 5 , wherein at least a portion of the first magnet is disposed radially outward from the pair of second magnets.

11. A rotor used in an inner rotor type rotating electric machine, the rotor having a plurality of magnetic poles in a circumferential direction around a central axis extending vertically, A magnet constituting each of the magnetic poles; a rotor core having an axially extending receiving hole for receiving the magnet; A resin to be placed in the receiving hole; having The rotor core is A first block; a second block arranged in the axial direction together with the first block, the second block being arranged such that the circumferential position of the accommodation hole is shifted with respect to the first block; having the first block and the second block each have a resin groove extending from an upper end to a lower end in the axial direction, communicating with the accommodation hole of each block, and into which the resin is poured; the resin groove of the first block and the resin groove of the second block are connected to each other while at least a part of the resin groove of the first block overlaps with each other in the axial direction, or are connected to each other via the resin groove of at least one other block that is disposed between the first block and the second block in the axial direction, The magnet includes a pair of second magnets that are paired to form a V-shape when viewed in a plan view from the axial direction, the accommodation hole includes a pair of second magnet accommodation holes that accommodate the pair of second magnets, the resin grooves include second resin grooves recessed in a circumferential direction from the inner surfaces of the pair of second magnet accommodating holes, The rotor core is formed by stacking magnetic steel plates in the axial direction, In the first block and the second block, the end magnetic steel plates, which are the magnetic steel plates at the axial upper and lower ends, and the intermediate magnetic steel plates, which are the magnetic steel plates arranged axially between the end magnetic steel plates at the axial upper and lower ends, have different shapes of groove portions constituting the second resin grooves; A rotor, wherein the end magnetic steel plates have grooves that extend circumferentially longer than the grooves of the intermediate magnetic steel plates.

12. an outer edge of the second magnet accommodating hole has a first outer edge portion and a second outer edge portion that face each other in a short side direction of the second magnet in a plan view from the axial direction, The first outer edge portion is disposed radially inward from the second outer edge portion, The rotor according to claim 9 , wherein the second resin groove is provided on an inner surface extending in the axial direction from the first outer edge portion.

13. A rotor as described in any one of claims 10 to 12, wherein, when viewed in a planar view from the axial direction, the second resin groove has a length in a direction perpendicular to the longitudinal direction of the second magnet that is longer than its width in a direction parallel to the longitudinal direction of the second magnet, at least at either the upper or lower axial end.

14. The rotor core is formed by stacking magnetic steel plates in the axial direction, In the first block and the second block, the end magnetic steel plates, which are the magnetic steel plates at the axial upper and lower ends, and the intermediate magnetic steel plates, which are the magnetic steel plates arranged axially between the end magnetic steel plates at the axial upper and lower ends, have different shapes of groove portions constituting the second resin grooves; The rotor according to claim 9 or 10, wherein the end magnetic steel plates have grooves that extend circumferentially longer than the grooves of the intermediate magnetic steel plates.

15. The rotor according to claim 1 , wherein the first block and the second block are aligned in axial contact with each other.

16. 16. The rotor according to claim 1, wherein a block set in which the first block and the second block are arranged in axial contact with each other is arranged line-symmetrically with respect to a bisecting plane that bisects the rotor core in the axial direction.

17. The rotor core has at least one of the other blocks, 17. The rotor according to claim 1, wherein the arrangement of the magnetic poles of the rotor core is line-symmetrical between the upper side and the lower side with respect to a bisecting plane that bisects the rotor core in the axial direction.

18. A rotor according to any one of claims 1 to 17; a stator disposed radially outward of the rotor; A rotating electric motor having the above structure.

19. A rotating electric machine according to claim 18; a gear unit connected to the rotating electric machine; A drive device having the above structure.

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