Rotor core, rotating electrical machine, and drive device

Abstract

To provide a rotor core having structure capable of suppressing leakage of magnetic fluxes while securing strength.SOLUTION: At least one magnet hole comprises: first hole parts 53a, 54a, 55a, 56a provided in at least one of a plurality of plate members; and second hole parts 53b, 54b, 55b, 56b provided in at least one plate member different from the plate member provided with the first hole parts and connected in the first hole parts in an axial direction. A magnet holding part 31 comprises: a connection hole part 57 provided in the plate member provided with the first hole parts; and a partition wall part 37 provided in the plate member provided with the second hole parts. The connection hole part connects the first hole parts with either of other magnet hole different from the magnet hole provided with the first hole parts or an outside surface in a radial direction of a rotor core body 30a. The partition wall part divides one part and the second holes parts and overlaps with the connection hole part in a view of the axial direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a rotor core, a rotating electrical machine, and a driving device.

Background Art

[0002] There is known a rotating electrical machine including a rotor core having a pair of magnet insertion holes in a substantially V shape. For example, Patent Document 1 describes a rotating electrical machine in which a bridge portion that separates a pair of magnet insertion holes is provided in the rotor core as such a rotating electrical machine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the rotor core as described above, for example, the output of the rotating electrical machine may decrease due to magnetic flux leaking radially inward from the bridge portion. On the other hand, if the bridge portion is made thinner or the bridge portion is eliminated to connect the magnet insertion holes, it is possible to suppress magnetic flux from leaking radially inward and suppress a decrease in the output of the rotating electrical machine. However, in this case, there is a risk that the strength of the rotor core decreases and problems such as deformation of the magnet insertion holes occur.

[0005] In view of the above circumstances, an object of the present invention is to provide a rotor core having a structure capable of suppressing magnetic flux leakage while ensuring strength, a rotating electrical machine including such a rotor core, and a driving device including such a rotating electrical machine.

Means for Solving the Problems

[0006] One aspect of the rotor core of the present invention is a rotor core of a rotor rotatable about a central axis, comprising a rotor core body formed by axially laminating a plurality of plate members. The rotor core body has a magnet holding portion having a plurality of magnet holes. The plurality of magnet holes include a pair of first magnet holes adjacent to each other in the circumferential direction, and a second magnet hole different from the pair of first magnet holes. The pair of first magnet holes extend in a direction away from each other in the circumferential direction as they go from the radially inner side to the radially outer side when viewed in the axial direction. At least one of the plurality of magnet holes has a first hole portion provided in at least one of the plurality of plate members, and a second hole portion provided in at least one plate member different from the plate member in which the first hole portion is provided and axially connected to the first hole portion. The magnet holding portion has a connection hole portion provided in the plate member in which the first hole portion is provided, and a partition portion provided in the plate member in which the second hole portion is provided. The connection hole portion connects the first hole portion to either another magnet hole different from the magnet hole in which the first hole portion is provided or a portion of the radially outer surface of the rotor core body. The partition portion separates the one portion from the second hole portion and overlaps the connection hole portion when viewed in the axial direction.

[0007] One aspect of the rotating electrical machine of the present invention includes the above-described rotor core, a rotor having a plurality of magnets respectively disposed in the plurality of magnet holes, and a stator facing the rotor with a gap therebetween.

[0008] One aspect of the drive device of the present invention includes the above-described rotating electrical machine and a gear mechanism connected to the rotating electrical machine.

Advantages of the Invention

[0009] According to one aspect of the present invention, in a rotating electrical machine and a drive device, it is possible to suppress magnetic flux leakage while ensuring the strength of the rotor core.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

[0011] In the following description, based on the positional relationship when the driving device of the embodiment is mounted on a vehicle located on a horizontal road surface, the vertical direction will be defined and described. That is, the relative positional relationship regarding the vertical direction described in the following embodiments only needs to be satisfied at least when the driving device is mounted on a vehicle located on a horizontal road surface.

[0012] In the drawings, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is simply referred to as the "upper side", and the lower side in the vertical direction is simply referred to as the "lower side". The X-axis direction is a direction orthogonal to the Z-axis direction and is the front-rear direction of the vehicle on which the driving device is mounted. In the following embodiments, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions orthogonal to the vertical direction.

[0013] Note that the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the -X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle, and the -Y side is the left side of the vehicle. Also, in this specification, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" includes a substantially orthogonal direction.

[0014] The central axis J shown in the figure as appropriate is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction orthogonal to the vertical direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J, that is, the axis rotation around the central axis J is simply referred to as the "circumferential direction".

[0015] <First Embodiment> The drive device 100 of the present embodiment shown in FIG. 1 is a drive device mounted on a vehicle and rotates an axle 73. The vehicle on which the drive device 100 is mounted is a vehicle that uses a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). As shown in FIG. 1, the drive device 100 includes a rotating electrical machine 60, a gear mechanism 70 connected to the rotating electrical machine 60, a housing 80 that houses the rotating electrical machine 60 and the gear mechanism 70 therein, and a control device 64 that controls the rotating electrical machine 60. In the present embodiment, the rotating electrical machine 60 is a motor.

[0016] The housing 80 houses the rotating electrical machine 60 and the gear mechanism 70 therein. The housing 80 has a motor housing 81 that houses the rotating electrical machine 60 therein and a gear housing 82 that houses the gear mechanism 70 therein. In the present embodiment, oil O is housed inside the motor housing 81 and inside the gear housing 82.

[0017] The gear mechanism 70 transmits the rotation of the rotating electrical machine 60 to the axle 73 of the vehicle. The gear mechanism 70 has a speed reduction device 71 connected to the rotating electrical machine 60 and a differential device 72 connected to the speed reduction device 71. The axle 73 is connected to the differential device 72.

[0018] The rotating electrical machine 60 includes a rotor 10 that is rotatable about a central axis J and a stator 61 that faces the rotor 10 with a gap therebetween. In the present embodiment, the stator 61 is located radially outside the rotor 10. The stator 61 has a stator core 62 and a plurality of coils 63 attached to the stator core 62.

[0019] As shown in FIG. 2, the rotor 10 has a shaft 20, a rotor core 30, and a plurality of magnets 40. As shown in FIG. 1, the shaft 20 extends axially about the central axis J. The left end (+Y side) of the shaft 20 protrudes into the gear housing 82.

[0020] The rotor core 30 is fixed to the outer peripheral surface of the shaft 20. As shown in FIG. 2, the rotor core 30 is cylindrical about the central axis J. The rotor core 30 has a central hole 30h penetrating the rotor core 30 in the axial direction. The central hole 30h is a circular hole about the central axis J. The shaft 20 is passed through the central hole 30h in the axial direction. The inner peripheral surface of the central hole 30h is fixed to the outer peripheral surface of the shaft 20.

[0021] The rotor core 30 includes a rotor core body 30a. In the present embodiment, the rotor core 30 consists only of the rotor core body 30a. The rotor core body 30a is made of a magnetic material. As shown in FIG. 3, the rotor core body 30a is configured by laminating a plurality of plate members 30b in the axial direction. The plate member 30b is a plate-like member whose plate surface faces the axial direction. The plate member 30b is disc-shaped about the central axis J. The plate member 30b is, for example, an electromagnetic steel sheet.

[0022] As shown in FIG. 2, the rotor core body 30a has a magnet holding portion 31 having a plurality of magnet holes 50. The magnet holding portion 31 is provided in the radially outer portion of the rotor core body 30a. In the present embodiment, a plurality of magnet holding portions 31 are provided along the circumferential direction. The plurality of magnet holding portions 31 are arranged at equal intervals over one circumference along the circumferential direction. In the present embodiment, eight magnet holding portions 31 are provided.

[0023] In this embodiment, the plurality of magnet holes 50 penetrate the rotor core body 30a in the axial direction. As shown in FIGS. 4 and 5, in each of the magnet holding portions 31, the plurality of magnet holes 50 include a pair of first magnet holes 51a and 51b adjacent to each other in the circumferential direction, and a second magnet hole 52 different from the pair of first magnet holes 51a and 51b. In each magnet holding portion 31 of this embodiment, the second magnet hole 52 includes a pair of second magnet holes 52a and 52b adjacent to each other in the circumferential direction. That is, in each of the magnet holding portions 31, the plurality of magnet holes 50 include a pair of second magnet holes 52a and 52b. In this embodiment, each magnet holding portion 31 is provided with a total of four magnet holes 50, namely, a pair of first magnet holes 51a and 51b and a pair of second magnet holes 52a and 52b.

[0024] One magnet 40 is disposed in each of the plurality of magnet holes 50. The type of the magnet 40 is not particularly limited. The magnet 40 may be, for example, a neodymium magnet or a ferrite magnet. The magnet 40 is, for example, in the shape of a rectangular parallelepiped that is long in the axial direction. The magnet 40 extends, for example, from one axial end portion of the rotor core 30 to the other axial end portion.

[0025] The plurality of magnets 40 include a pair of first magnets 41a and 41b respectively disposed in the pair of first magnet holes 51a and 51b, and a pair of second magnets 42a and 42b respectively disposed in the pair of second magnet holes 52a and 52b. As shown in FIG. 2, resin 90 is disposed in a portion other than the portion where the magnet 40 is disposed in each magnet hole 50. In this embodiment, each magnet 40 is fixed in each magnet hole 50 by the resin 90. In the figures other than FIG. 2, the illustration of the resin 90 is omitted. Further, the method of fixing each magnet 40 to each magnet hole 50 is not particularly limited. For example, each magnet 40 may be fixed to each magnet hole 50 by caulking a part of the rotor core 30.

[0026] As shown in FIG. 2, one magnet holding portion 31 and a plurality of magnets 40 arranged in a plurality of magnet holes 50 provided in one magnet holding portion 31 constitute the magnetic pole portion 10P. A plurality of magnetic pole portions 10P are arranged at equal intervals along the circumferential direction for one turn. In the present embodiment, eight magnetic pole portions 10P are provided. The plurality of magnetic pole portions 10P include a plurality of magnetic pole portions 10N with N poles on the outer peripheral surface of the rotor core 30 and a plurality of magnetic pole portions 10S with S poles on the outer peripheral surface of the rotor core 30. In the present embodiment, four magnetic pole portions 10N and four magnetic pole portions 10S are provided. The four magnetic pole portions 10N and the four magnetic pole portions 10S are arranged alternately along the circumferential direction. The configuration of each magnetic pole portion 10P is the same except for the points where the magnetic poles on the outer peripheral surface of the rotor core 30 are different and the circumferential positions are different.

[0027] As shown in FIGS. 4 and 5, in the magnetic pole portion 10P, the first magnet hole 51a and the first magnet hole 51b are arranged with the magnetic pole center line Ld interposed therebetween in the circumferential direction. The magnetic pole center line Ld is a virtual line that passes through the circumferential center of the magnetic pole portion 10P and the central axis J and extends in the radial direction. The magnetic pole center line Ld is provided for each magnetic pole portion 10P. The magnetic pole center line Ld passes through the d-axis of the rotor 10 when viewed in the axial direction. The direction in which the magnetic pole center line Ld extends is the d-axis direction of the rotor 10. The first magnet hole 51a and the first magnet hole 51b are arranged symmetrically with respect to the magnetic pole center line Ld when viewed in the axial direction.

[0028] The pair of first magnet holes 51a and 51b extend in a direction away from each other in the circumferential direction as they go from the inner side in the radial direction to the outer side in the radial direction when viewed in the axial direction. That is, the circumferential distance between the first magnet hole 51a and the first magnet hole 51b increases as it goes from the inner side in the radial direction to the outer side in the radial direction. The pair of first magnet holes 51a and 51b are arranged along a V-shaped configuration that spreads in the circumferential direction as it goes to the outer side in the radial direction when viewed in the axial direction. The pair of first magnets 41a and 41b arranged in the pair of first magnet holes 51a and 51b are arranged along a V-shaped configuration that spreads in the circumferential direction as it goes to the outer side in the radial direction when viewed in the axial direction.

[0029] The pair of second magnet holes 52a and 52b are located radially inside the pair of first magnet holes 51a and 51b. The second magnet hole 52a is located radially inside the first magnet hole 51a. The second magnet hole 52b is located radially inside the first magnet hole 51b. The pair of second magnet holes 52a and 52b are arranged with the pair of first magnet holes 51a and 51b interposed therebetween in the circumferential direction. In the magnetic pole portion 10P, the second magnet hole 52a and the second magnet hole 52b are arranged with the magnetic pole center line Ld interposed therebetween in the circumferential direction. The second magnet hole 52a and the second magnet hole 52b are arranged symmetrically with respect to the magnetic pole center line Ld when viewed in the axial direction.

[0030] The pair of second magnet holes 52a and 52b extend in a direction in which they are separated from each other in the circumferential direction as they go from the radially inner side to the radially outer side when viewed in the axial direction. That is, the circumferential distance between the second magnet hole 52a and the second magnet hole 52b increases as it goes from the radially inner side to the radially outer side. In the present embodiment, the radially inner ends of the pair of second magnet holes 52a and 52b are arranged apart from each other in the circumferential direction. A bridge portion 37a is provided between the radially inner ends of the pair of second magnet holes 52a and 52b.

[0031] The bridge portion 37a extends in the radial direction. The bridge portion 37a has a substantially rectangular shape that is long in the radial direction when viewed in the axial direction. The circumferential center position of the bridge portion 37a is, for example, the same as the circumferential position of the magnetic pole center line Ld. The circumferential dimension at the radially outer end of the bridge portion 37a increases as it goes toward the radially outer side. The circumferential dimension at the radially inner end of the bridge portion 37a increases as it goes toward the radially inner side.

[0032] The pair of second magnet holes 52a and 52b are arranged along a V-shaped configuration that widens in the circumferential direction as it extends radially outward when viewed in the axial direction. The pair of second magnets 42a and 42b arranged in the pair of second magnet holes 52a and 52b are arranged along a V-shaped configuration that widens in the circumferential direction as it extends radially outward when viewed in the axial direction. That is, in each magnetic pole portion 10P of the present embodiment, two pairs of magnets 40 arranged along a V-shaped configuration when viewed in the axial direction are provided side by side in the radial direction. By providing the four magnets 40 in each magnetic pole portion 10P in such an arrangement, magnetic flux can flow suitably between the rotor 10 and the stator 61. Thereby, the output of the rotating electrical machine 60 can be suitably obtained.

[0033] The first magnet hole 51a and the second magnet hole 52a extend parallel to each other when viewed in the axial direction. The first magnet hole 51b and the second magnet hole 52b extend parallel to each other when viewed in the axial direction. The first magnet 41a and the second magnet 42a extend parallel to each other when viewed in the axial direction. The first magnet 41b and the second magnet 42b extend parallel to each other when viewed in the axial direction.

[0034] In each magnet hole 50, each magnet 40 is arranged so as to be separated from both ends in the direction in which each magnet hole 50 extends when viewed in the axial direction. Thereby, flux barrier portions 50f are provided on both sides of each magnet 40 in the direction in which each magnet 40 extends when viewed in the axial direction. In the present embodiment, each flux barrier portion 50f is formed by filling a part of the magnet hole 50 with resin 90.

[0035] In this specification, the "direction in which the magnet extends when viewed in the axial direction" means, for example, when the magnet is rectangular when viewed in the axial direction like the first magnets 41a and 41b of the present embodiment, the direction in which the long side of the rectangular magnet extends. That is, for example, in the present embodiment, the "direction in which the first magnet 41a extends when viewed in the axial direction" means the direction in which the long side of the rectangular first magnet 41a extends when viewed in the axial direction.

[0036] In addition, in this specification, the "flux barrier portion" is a portion that can suppress the flow of magnetic flux. That is, it is difficult for magnetic flux to pass through each flux barrier portion. Each flux barrier portion is not particularly limited as long as it can suppress the flow of magnetic flux, and may include a gap portion or a non-magnetic portion other than resin.

[0037] In each magnet hole 50 of the present embodiment, each magnet 40 is in contact with a surface located on the outer side in the radial direction in a direction orthogonal to the direction in which each magnet hole 50 extends when viewed in the axial direction, among the inner surfaces of each magnet hole 50. A concave portion 50e is provided on a surface located on the inner side in the radial direction in a direction orthogonal to the direction in which each magnet hole 50 extends when viewed in the axial direction, among the inner surfaces of each magnet hole 50. The concave portion 50e is filled with resin 90. By providing the concave portion 50e, the resin 90 can be firmly held in the magnet hole 50. Therefore, the magnet 40 can be firmly fixed in the magnet hole 50 via the resin 90.

[0038] As shown in FIG. 3, the first magnet hole 51a has a first hole portion 53a provided in at least one of the plurality of plate members 30b and a second hole portion 53b provided in at least one plate member 30b different from the plate member 30b in which the first hole portion 53a is provided. The second hole portion 53b is axially connected to the first hole portion 53a. In the present embodiment, the first magnet hole 51a is configured by axially connecting a plurality of first hole portions 53a and a plurality of second hole portions 53b. The first hole portion 53a and the second hole portion 53b are provided alternately, for example, two by two along the axial direction.

[0039] The first magnet hole 51b has a first hole portion 54a provided in at least one of the plurality of plate members 30b, and a second hole portion 54b provided in at least one plate member 30b different from the plate member 30b in which the first hole portion 54a is provided. The second hole portion 54b is axially connected to the first hole portion 54a. In the present embodiment, the first magnet hole 51b is configured by axially connecting a plurality of first hole portions 54a and a plurality of second hole portions 54b. The first hole portion 54a and the second hole portion 54b are provided alternately, for example, two by two along the axial direction.

[0040] The second magnet hole 52a has a first hole portion 55a provided in at least one of the plurality of plate members 30b, and a second hole portion 55b provided in at least one plate member 30b different from the plate member 30b in which the first hole portion 55a is provided. The second hole portion 55b is axially connected to the first hole portion 55a. In the present embodiment, the second magnet hole 52a is configured by axially connecting a plurality of first hole portions 55a and a plurality of second hole portions 55b. The first hole portion 55a and the second hole portion 55b are provided alternately, for example, two by two along the axial direction.

[0041] The second magnet hole 52b has a first hole portion 56a provided in at least one of the plurality of plate members 30b, and a second hole portion 56b provided in at least one plate member 30b different from the plate member 30b in which the first hole portion 56a is provided. The second hole portion 56b is axially connected to the first hole portion 56a. In the present embodiment, the second magnet hole 52b is configured by axially connecting a plurality of first hole portions 56a and a plurality of second hole portions 56b. The first hole portion 56a and the second hole portion 56b are provided alternately, for example, two by two along the axial direction.

[0042] As shown in FIG. 5, in the present embodiment, a pair of protrusions 32a that sandwich the first magnet 41a disposed in the first magnet hole 51a are provided on the inner surface of the second hole portion 53b. When viewed in the axial direction, the pair of protrusions 32a sandwich the first magnet 41a in the direction in which the first magnet hole 51a and the first magnet 41a extend. In the present embodiment, the pair of protrusions 32a protrude radially outward from the radially inner side surface in the direction orthogonal to the direction in which the first magnet hole 51a extends when viewed in the axial direction. As shown in FIG. 4, a pair of protrusions 32a are not provided on the inner surface of the first hole portion 53a.

[0043] As shown in FIG. 3, a pair of convex portions 32 are formed by a pair of protrusions 32a in a plurality of second hole portions 53b overlapped in the axial direction. The convex portions 32 extend in the axial direction. Each convex portion 32 is formed by a plurality of protrusions 32a arranged along the axial direction. In the present embodiment, the convex portion 32 is formed by providing a plurality of two protrusions 32a overlapped in the axial direction with a gap therebetween along the axial direction. Although not shown, resin 90 is disposed in the gap between the two protrusions 32a and the other two protrusions 32a adjacent to each other in the axial direction. The pair of convex portions 32 sandwich the first magnet 41a disposed in the first magnet hole 51a.

[0044] As shown in Fig. 5, on the inner surface of the second hole portion 54b, a pair of protrusions 33a are provided that sandwich the first magnet 41b disposed in the first magnet hole 51b. On the inner surface of the second hole portion 55b, a pair of protrusions 34a are provided that sandwich the second magnet 42a disposed in the second magnet hole 52a. On the inner surface of the second hole portion 56b, a pair of protrusions 35a are provided that sandwich the second magnet 42b disposed in the second magnet hole 52b. The pair of protrusions 33a are the same as the pair of protrusions 32a except that they are provided on the inner surface of the first magnet hole 51b. The pair of protrusions 34a are the same as the pair of protrusions 32a except that they are provided on the inner surface of the second magnet hole 52a. The pair of protrusions 35a are the same as the pair of protrusions 32a except that they are provided on the inner surface of the second magnet hole 52b. As shown in Fig. 4, on the inner surfaces of the first hole portions 54a, 55a, and 56a, no pair of protrusions are provided.

[0045] As shown in Fig. 3, a pair of convex portions 33 are formed by a pair of protrusions 33a in a plurality of second hole portions 54b stacked in the axial direction. A pair of convex portions 34 are formed by a pair of protrusions 34a in a plurality of second hole portions 55b stacked in the axial direction. A pair of convex portions 35 are formed by a pair of protrusions 35a in a plurality of second hole portions 56b stacked in the axial direction. Each of the convex portions 33, 34, and 35 is the same as the convex portion 32 except that the provided magnet holes 50 are different.

[0046] As described above, by providing the pair of protrusions 32a, 33a, 34a, and 35a on the inner surfaces of the respective hole portions, the positions of the respective magnets 40 can be determined to a certain extent by the pair of protrusions 32a, 33a, 34a, and 35a. Therefore, each magnet 40 can be suitably disposed within each magnet hole 50.

[0047] As shown in Fig. 4, the magnet holding portion 31 has a first connection hole portion 57. The first connection hole portion 57 is provided in the plate member 30b in which the first hole portions 53a and 54a are provided. The first connection hole portion 57 is a connection hole portion that connects the radially inner ends of the pair of first magnet holes 51a and 51b. The first connection hole portion 57 connects the radially inner end of the first hole portion 53a and the radially inner end of the first hole portion 54a. That is, the first connection hole portion 57 connects the first hole portion 53a and the first magnet hole 51b as another magnet hole 50 different from the first magnet hole 51a in which the first hole portion 53a is provided. Further, the first connection hole portion 57 connects the first hole portion 54a and the first magnet hole 51a as another magnet hole 50 different from the first magnet hole 51b in which the first hole portion 54a is provided.

[0048] In the present embodiment, the edge portion located in the radial direction among the inner edge portions of the first connection hole portion 57 extends linearly when viewed in the axial direction. The edge portion located on the radially outer side among the inner edge portions of the first connection hole portion 57 extends in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction, and connects the radially outer edge portions of the first hole portion 53a and the first hole portion 54a. The edge portion located on the radially inner side among the inner edge portions of the first connection hole portion 57 extends in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction, and connects the radially inner edge portions of the first hole portion 53a and the first hole portion 54a.

[0049] As shown in Fig. 5, the magnet holding portion 31 has a first partition portion 37. The first partition portion 37 is a part of the plate member 30b. The first partition portion 37 is provided in the plate member 30b in which the second hole portions 53b and 54b are provided. The first partition portion 37 is a partition portion that separates the radially inner ends of the pair of first magnet holes 51a and 51b. In the present embodiment, the first partition portion 37 separates the radially inner end in the second hole portion 53b of the first magnet hole 51a and the radially inner end in the second hole portion 54b of the first magnet hole 51b in the circumferential direction. That is, the first partition portion 37 separates the first magnet hole 51a and the second hole portion 54b. Further, the first partition portion 37 separates the first magnet hole 51b and the second hole portion 53b.

[0050] The first partition portion 37 extends in the radial direction. The first partition portion 37 has a substantially rectangular shape that is long in the radial direction when viewed in the axial direction. The circumferential center position of the first partition portion 37 is the same as the circumferential position of the magnetic pole center line Ld. The circumferential dimension of the radially outer end portion of the first partition portion 37 increases as it goes radially outward. The circumferential dimension of the radially inner end portion of the first partition portion 37 increases as it goes radially inward. The minimum value of the circumferential dimension L1 of the first partition portion 37 is smaller than the minimum value of the circumferential distance L2 between the radially inner end portions of the pair of second magnet holes 52a and 52b. In the present embodiment, the minimum value of the circumferential dimension L1 of the first partition portion 37 is the value of the circumferential dimension of the portion of the first partition portion 37 excluding both radially end portions. In the present embodiment, the minimum value of the circumferential distance L2 between the radially inner end portions of the pair of second magnet holes 52a and 52b is the value of the circumferential dimension of the portion of the bridge portion 37a excluding both radially end portions.

[0051] As shown in FIGS. 3 and 4, the first partition portion 37 overlaps with the first connection hole portion 57 when viewed in the axial direction. As shown in FIG. 3, in the present embodiment, the first partition portion 37 and the first connection hole portion 57 are alternately arranged in two each along the axial direction. Although not shown, resin 90 is disposed in the first connection hole portion 57. That is, resin 90 is disposed between the first partition portions 37 adjacent in the axial direction via the first connection hole portion 57.

[0052] In FIGS. 4 and 6, one plate member 30c out of a plurality of plate members 30b is shown. In a part of the magnet holding portion 31 located at the uppermost side in FIGS. 4 and 6 of the plate member 30c, first hole portions 53a, 54a, 55a, 56a, and a first connection hole portion 57 are provided. In FIGS. 5 and 7, another plate member 30d different from the plate member 30c out of the plurality of plate members 30b is shown. In a part of the magnet holding portion 31 located at the uppermost side in FIGS. 5 and 7 of the plate member 30d, second hole portions 53b, 54b, 55b, 56b, and a first partition portion 37 are provided. FIGS. 4 to 7 show the case where the circumferential positions of the rotor 10 are the same. The plate member 30c and the plate member 30d are, for example, plate members 30b laminated adjacent to each other in the axial direction.

[0053] In the present embodiment, each magnet holding portion 31 is configured by laminating a plurality of first magnet holding portions 31a and a plurality of second magnet holding portions 31b in the axial direction. As shown in FIGS. 6 and 7, the first magnet holding portion 31a has the first hole portions 53a, 54a, 55a, 56a and the first connection hole portion 57. The second magnet holding portion 31b has the second hole portions 53b, 54b, 55b, 56b and the first partition portion 37.

[0054] In the present embodiment, a plurality of first magnet holding portions 31a and a plurality of second magnet holding portions 31b are provided in each plate member 30b. That is, each of the plurality of plate members 30b has the first hole portions 53a, 54a and the first connection hole portion 57 in one magnet holding portion 31, and the second hole portions 53b, 54b and the first partition portion 37 in another magnet holding portion 31.

[0055] In each plate member 30b, a second magnet holding portion 31b is disposed at a position that sandwiches the central axis J in the radial direction with the first magnet holding portion 31a. In each plate member 30b, a first magnet holding portion 31a is disposed at a position that sandwiches the central axis J in the radial direction with the second magnet holding portion 31b. That is, in each of the plurality of plate members 30b of the present embodiment, the magnet holding portion 31 provided with the first hole portions 53a and 54a and the first connection hole portion 57, and the magnet holding portion 31 provided with the second hole portions 53b and 54b and the first partition portion 37 are located on opposite sides in the radial direction with the central axis J interposed therebetween.

[0056] In the present embodiment, the plurality of first magnet holding portions 31a and the plurality of second magnet holding portions 31b are respectively grouped and arranged in the circumferential direction. In each plate member 30b, four first magnet holding portions 31a are arranged side by side along the circumferential direction. In each plate member 30b, four second magnet holding portions 31b are arranged side by side along the circumferential direction. The four first magnet holding portions 31a and the four second magnet holding portions 31b are respectively arranged in different adjacent regions RE1 and RE2 in the circumferential direction. In FIG. 6, the region RE1 and the region RE2 are shown separated by a virtual line IL1 passing through the central axis J as viewed in the axial direction. In FIG. 7, the region RE1 and the region RE2 are shown separated by a virtual line IL2 passing through the central axis J as viewed in the axial direction. The virtual line IL1 and the virtual line IL2 are orthogonal to each other as viewed in the axial direction.

[0057] In each of the regions RE1 shown in FIGS. 6 and 7, four first magnet holding portions 31a are provided. In each of the regions RE2 shown in FIGS. 6 and 7, four second magnet holding portions 31b are provided. In FIGS. 6 and 7, the regions RE1 and RE2 are each a semi-circular arc-shaped region with a circumferential angle of 180°. In FIG. 6, the regions RE1 and RE2 are arranged with the virtual line IL1 interposed therebetween in the radial direction. In FIG. 7, the regions RE1 and RE2 are arranged with the virtual line IL2 interposed therebetween in the radial direction. A part of the region RE1 shown in FIG. 6 and a part of the region RE2 shown in FIG. 7 overlap when viewed in the axial direction. A part of the region RE2 shown in FIG. 6 and a part of the region RE1 shown in FIG. 7 overlap when viewed in the axial direction.

[0058] Thus, in each of the plurality of plate members 30b of the present embodiment, the magnet holding portion 31 provided with the first hole portions 53a, 54a and the first connection hole portion 57 and the magnet holding portion 31 provided with the second hole portions 53b, 54b and the first partition portion 37 are arranged in different regions RE1, RE2 adjacent to each other in the circumferential direction, and a plurality of them are provided along the circumferential direction in each of the regions RE1, RE2.

[0059] As shown in FIGS. 6 and 7, in the present embodiment, the plurality of plate members 30b have the same shape as each other. The plate members 30b adjacent to each other in the axial direction are laminated with a circumferential shift from each other. As shown in FIGS. 6 and 7, the angle θ by which the plate members 30b adjacent to each other in the axial direction are circumferentially shifted in the present embodiment is 90°. That is, in the present embodiment, the rotor core body 30a is formed by laminating plate members 30b having the same shape while rotating them 90° in the circumferential direction. In FIG. 7, the angle θ is the circumferential angle formed by the virtual line IL1 and the virtual line IL2.

[0060] As shown in FIGS. 4 and 5, the rotor core body 30a has caulking portions 36 that fix the axially adjacent plate members 30b to each other. The caulking portions 36 are provided on each plate member 30b. The caulking portion 36 is a portion formed by caulking a part of the plate member 30b in the axial direction. In the present embodiment, the caulking portion 36 is formed by caulking a part of the plate member 30b to the right side (-Y side). By providing the caulking portion 36, the plate member 30b is provided with a recessed portion 36a that is recessed to the right side. The caulking portion 36 provided on one plate member 30b is fitted and fixed to the recessed portion 36a provided on another plate member 30b adjacent to the right side of the one plate member 30b. Thereby, the caulking portion 36 fixes the axially adjacent plate members 30b to each other.

[0061] The caulking portion 36 is located between the pair of first magnet holes 51a and 51b in the circumferential direction. The circumferential position of the caulking portion 36 includes the circumferential center position of the first partition portion 37. In the present embodiment, the circumferential center position of the caulking portion 36 is the same as the circumferential center position of the first partition portion 37. The circumferential center position of the caulking portion 36 is the same as the circumferential position of the magnetic pole center line Ld. Note that in the figures other than FIGS. 4 and 5, the illustration of the caulking portion 36 is omitted.

[0062] According to the present embodiment, the first magnet hole 51a has a first hole portion 53a provided in at least one of the plurality of plate members 30b, and a second hole portion 53b provided in at least one plate member 30b different from the plate member 30b in which the first hole portion 53a is provided, and the second hole portion 53b is axially connected to the first hole portion 53a. The magnet holding portion 31 has a first connection hole portion 57 provided in the plate member 30b in which the first hole portion 53a is provided, and a first partition portion 37 provided in the plate member 30b in which the second hole portion 53b is provided. The first connection hole portion 57 connects the first hole portion 53a and another magnet hole 50 different from the magnet hole 50 in which the first hole portion 53a is provided, that is, the first magnet hole 51b in which the first hole portion 54a is provided in the present embodiment. The first partition portion 37 separates the first magnet hole 51b and the second hole portion 53b, and overlaps the first connection hole portion 57 when viewed in the axial direction. Therefore, the first connection hole portion 57 functions as a flux barrier portion, and it is possible to make it difficult for magnetic flux to pass between the first magnet hole 51a and the first magnet hole 51b. In other words, for the portion where the first connection hole portion 57 is provided, the magnetic body portion provided between the first magnet hole 51a and the first magnet hole 51b can be reduced, and it is possible to make it difficult for magnetic flux to pass between the first magnet hole 51a and the first magnet hole 51b. Therefore, it is possible to suppress magnetic flux from leaking between the first magnet hole 51a and the first magnet hole 51b. On the other hand, since the first partition portion 37 that overlaps the first connection hole portion 57 in the axial direction is provided, it is possible to suppress a decrease in the strength of the rotor core 30 compared to the case where the space between the first magnet hole 51a and the first magnet hole 51b is entirely connected by holes. Therefore, it is possible to suppress magnetic flux from leaking while ensuring the strength of the rotor core 30. Therefore, it is possible to suppress a decrease in the output of the rotating electrical machine 60 while suppressing deformation of the rotor core 30 in the magnet hole 50 and the like.

[0063] Further, according to the present embodiment, a plurality of magnet holding portions 31 are provided along the circumferential direction. Each of the plurality of plate members 30b has a first hole portion 53a and a first connection hole portion 57 in one magnet holding portion 31, and a second hole portion 53b and a first partition portion 37 in another magnet holding portion 31. That is, the first hole portion 53a, the first connection hole portion 57, the second hole portion 53b, and the first partition portion 37 can be provided in one plate member 30b. Therefore, as described above, even if all the plurality of plate members 30b have the same shape, by laminating them while shifting in the circumferential direction, the first connection hole portion 57 and the first partition portion 37 can be overlapped in the axial direction. Thereby, all the plurality of plate members 30b can have the same shape, and the type of the plate member 30b can be made one type. Therefore, the punching die used when manufacturing the plate member 30b by punching can be made one type. Therefore, an increase in the manufacturing cost of the plurality of plate members 30b can be suppressed, and an increase in the manufacturing cost of the rotor core 30 can be suppressed. Further, for example, when the first connection hole portion 57 is provided in any of the magnet holding portions 31 in one plate member 30b, the strength of the plate member 30b is likely to be smaller than the strength of the other plate members 30b. On the other hand, according to the present embodiment, since the first partition portion 37 is provided in any of the plate members 30b, the strength can be ensured in any of the plate members 30b.

[0064] Further, according to the present embodiment, in each of the plurality of plate members 30b, the magnet holding portion 31 provided with the first hole portion 53a and the first connection hole portion 57 and the magnet holding portion 31 provided with the second hole portion 53b and the first partition portion 37 are located on opposite sides in the radial direction with respect to the central axis J. That is, in the present embodiment, the first magnet holding portion 31a and the second magnet holding portion 31b are located on opposite sides in the radial direction with respect to the central axis J. Therefore, for example, compared with the case where the first connection hole portion 57 is provided in any of the magnet holding portions 31 on both sides sandwiching the central axis J in the radial direction, it is easier to ensure the strength of the plate member 30b. Further, compared with the case where the first partition portion 37 is provided in any of the magnet holding portions 31 on both sides sandwiching the central axis J in the radial direction, it is possible to suppress the magnetic flux flowing in the radial direction from flowing to the opposite side in the radial direction through the central axis J. Therefore, it is possible to further suppress the leakage of the magnetic flux.

[0065] Further, according to the present embodiment, in each of the plurality of plate members 30b, the magnet holding portion 31 provided with the first hole portion 53a and the first connection hole portion 57, that is, the first magnet holding portion 31a, and the magnet holding portion 31 provided with the second hole portion 53b and the first partition portion 37, that is, the second magnet holding portion 31b, are respectively arranged in different regions RE1 and RE2 adjacent to each other in the circumferential direction, and a plurality of them are provided along the circumferential direction in each of the regions RE1 and RE2. Therefore, in each plate member 30b, portions having different hole shapes can be collectively arranged. Thereby, the shape of the punching die for manufacturing the plate member 30b by punching can be simplified.

[0066] Further, according to the present embodiment, the plurality of plate members 30b have the same shape as each other. The plate members 30b adjacent to each other in the axial direction are laminated with a circumferential shift from each other. Therefore, the rotor core body 30a can be made of one type of plate member 30b. As a result, the number of types of punching dies used when manufacturing the plate member 30b by punching can be made one type. Accordingly, an increase in the manufacturing cost of the plurality of plate members 30b can be suppressed, and an increase in the manufacturing cost of the rotor core 30 can be suppressed.

[0067] Further, according to the present embodiment, the first connection hole portion 57 is a connection hole portion that connects the radially inner ends of the pair of first magnet holes 51a and 51b. The first partition portion 37 is a partition portion that separates the radially inner ends of the pair of first magnet holes 51a and 51b. The first partition portion 37 overlaps the first connection hole portion 57 when viewed in the axial direction. Therefore, while suppressing the leakage of magnetic flux in the radial direction between the pair of first magnet holes 51a and 51b, the strength of the portion of the rotor core 30 where the pair of first magnet holes 51a and 51b are provided can be ensured.

[0068] Further, according to the present embodiment, the edge portion located in the radial direction among the inner edge portions of the first connection hole portion 57 extends linearly when viewed in the axial direction. Therefore, for example, compared with the case where the edge portion located in the radial direction among the inner edge portions of the first connection hole portion 57 extends in a curved shape when viewed in the axial direction, it is easier to form the first connection hole portion 57 by punching with a punching die.

[0069] Also, according to the present embodiment, the rotor core body 30a has caulking portions 36 that fix the plate members 30b adjacent to each other in the axial direction. The caulking portions 36 are located between the pair of first magnet holes 51a and 51b in the circumferential direction. The circumferential position of the caulking portions 36 includes the circumferential center position of the first partition portion 37. By providing the caulking portions 36 at such positions, it is possible to suppress the caulking portions 36 from affecting the magnetic flux flowing through the rotor core body 30a. Also, it is easy to suppress the magnetic flux from flowing in the radial direction via the first partition portion 37 by the caulking portions 36. Also, it is easy to reinforce the portion where the first connection hole portion 57 overlapping the first partition portion 37 in the axial direction is provided by the caulking portions 36.

[0070] Also, according to the present embodiment, the radially inner ends of the pair of second magnet holes 52a and 52b are arranged apart from each other in the circumferential direction. The minimum value of the circumferential dimension L1 of the first partition portion 37 is smaller than the minimum value of the circumferential distance L2 between the radially inner ends of the pair of second magnet holes 52a and 52b. Therefore, it is easy to reduce the circumferential dimension L1 of the first partition portion 37, and it is easier to further reduce the magnetic flux flowing through the first partition portion 37. Thereby, it is possible to further suppress the leakage of magnetic flux. Also, it is easy to relatively increase the circumferential distance L2 between the radially inner ends of the pair of second magnet holes 52a and 52b. Therefore, it is easy to further increase the strength of the radially inner portion of the rotor core 30 fixed to the shaft 20, and it is possible to further suppress the deformation of the rotor core 30.

[0071] <Second Embodiment> Hereinafter, for the configurations similar to those of the above-described embodiments, the description may be omitted by appropriately assigning the same reference numerals. As shown in FIG. 8, in the rotor core 230 of the rotor 210 of the present embodiment, the magnet holding portion 231 has a second connection hole portion 258. The second connection hole portion 258 is a connection hole portion that connects the radially inner ends of the pair of second magnet holes 252a and 252b. The second connection hole portion 258 connects the radially inner end of the first hole portion 255a of the second magnet hole 252a and the radially inner end of the first hole portion 256a of the second magnet hole 252b. In the present embodiment, the second connection hole portion 258 is provided in the magnet holding portion 231 where the first connection hole portion 57 is provided in each plate member 30b, that is, in the first magnet holding portion 231a.

[0072] Among the inner edge portions of the second connection hole portion 258, the edge portion located in the radial direction extends linearly when viewed in the axial direction. Therefore, similar to the first connection hole portion 57 described above, it is easy to punch out the second connection hole portion 258 with a punching die. Among the inner edge portions of the second connection hole portion 258, the edge portion located on the outer side in the radial direction extends in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction, and connects the outer edge portion in the radial direction of the first hole portion 255a and the outer edge portion in the radial direction of the first hole portion 256a. Among the inner edge portions of the second connection hole portion 258, the edge portion located on the inner side in the radial direction extends in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction, and connects the inner edge portion in the radial direction of the first hole portion 255a and the inner edge portion in the radial direction of the first hole portion 256a.

[0073] The magnet holding portion 231 has a second partition portion 238. The second partition portion 238 is a partition portion that separates the radially inner ends of the pair of second magnet holes 252a and 252b. The second partition portion 238 separates the radially inner end portion of the second hole portion 255b of the second magnet hole 252a from the radially inner end portion of the second hole portion 256b of the second magnet hole 252b. In the present embodiment, the second partition portion 238 is provided in the magnet holding portion 231 where the first partition portion 37 is provided in each plate member 30b, that is, in the second magnet holding portion 231b. The second partition portion 238 overlaps with the second connection hole portion 258 when viewed in the axial direction. The shape of the second partition portion 238 when viewed in the axial direction is the same as, for example, the shape of the bridge portion 37a of the first embodiment when viewed in the axial direction.

[0074] Other configurations in each part of the rotor core 230 are the same as those in each part of the rotor core 30 of the first embodiment. Other configurations in each part of the rotor 210 are the same as those in each part of the rotor 10 of the first embodiment.

[0075] According to the present embodiment, the second connection hole portion 258 is a connection hole portion that connects the radially inner ends of the pair of second magnet holes 252a and 252b. The second partition portion 238 is a partition portion that separates the radially inner ends of the pair of second magnet holes 252a and 252b. The second partition portion 238 overlaps with the second connection hole portion 258 when viewed in the axial direction. Therefore, while suppressing the leakage of magnetic flux in the radial direction between the pair of second magnet holes 252a and 252b, the strength of the portion of the rotor core 230 where the pair of second magnet holes 252a and 252b are provided can be ensured.

[0076] In each magnet holding portion 231, the plate member 30b provided with the second connection hole portion 258 may be a plate member 30b different from the plate member 30b provided with the first connection hole portion 57. That is, the first magnet holding portion 231a may have the first connection hole portion 57 and the second partition portion 238, and the second magnet holding portion 231b axially connected to the first magnet holding portion 231a may have the second connection hole portion 258 and the first partition portion 37.

[0077] <Third Embodiment> Hereinafter, for the configurations similar to those of the above-described embodiments, the description may be omitted by appropriately assigning the same reference numerals. As shown in FIG. 9, in the rotor core 330 of the rotor 310 of the present embodiment, the pair of first magnet holes 351a and 351b provided in the magnet holding portion 331 are the same as the pair of second magnet holes 252a and 252b in the second embodiment, respectively. The first connection hole portion 357 is the same as the second connection hole portion 258 in the second embodiment. The first partition portion 337 is the same as the second partition portion 238 in the second embodiment.

[0078] In the present embodiment, only one second magnet hole 352 is provided in each magnet holding portion 331. The second magnet hole 352 is located between the circumferential directions of the radially outer ends of the pair of first magnet holes 351a and 351b. The second magnet hole 352 extends in an intersection direction that intersects the radial direction when viewed in the axial direction. In the present embodiment, the intersection direction in which the second magnet hole 352 extends when viewed in the axial direction is a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction.

[0079] The pair of first magnets 341a and 341b respectively disposed in the pair of first magnet holes 351a and 351b are the same as the pair of second magnets 42a and 42b in the first and second embodiments, respectively. One second magnet 342 disposed in one second magnet hole 352 extends in the tolerance direction in which the second magnet hole 352 extends when viewed in the axial direction. In the present embodiment, the second magnet 342 extends in a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction. Other configurations of the second magnet 342 are the same as other configurations of each magnet 40 in the first embodiment.

[0080] In the present embodiment, the pair of first magnet holes 351a and 351b and the second magnet hole 352 are arranged along the ∇ shape when viewed in the axial direction. The pair of first magnets 341a and 341b and the second magnet 342 are arranged along the ∇ shape when viewed in the axial direction. By arranging each magnet hole and each magnet in this way, magnetic flux can flow suitably between the rotor 310 and the stator 61. Thereby, the output of the rotating electrical machine 60 can be obtained suitably.

[0081] Other configurations of each part of the rotor core 330 are the same as those of each part of the rotor core 30 of the first embodiment. Other configurations of each part of the rotor 310 are the same as those of each part of the rotor 10 of the first embodiment.

[0082] <Fourth Embodiment> Hereinafter, for configurations similar to those of the above-described embodiments, the description may be omitted by appropriately assigning the same reference numerals. As shown in FIG. 10, in the rotor core 430 of the rotor 410 of the present embodiment, the pair of first magnet holes 451a and 451b provided in the magnet holding portion 431 are each connected to the radially outer surface 430s of the rotor core main body 430a by the fourth connection hole portions 459a and 459b to be described later, except for this point, they are the same as the pair of second magnet holes 52a and 52b of the first embodiment.

[0083] A pair of second magnet holes 452a and 452b are provided in the magnet holding portion 431. The pair of second magnet holes 452a and 452b are located between the circumferences of the radially outer ends of the pair of first magnet holes 451a and 451b. Each of the pair of second magnet holes 452a and 452b extends in an intersection direction intersecting the radial direction when viewed in the axial direction. In the present embodiment, the intersection direction in which the second magnet holes 452a and 452b extend when viewed in the axial direction is a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction. The pair of second magnet holes 452a and 452b are provided side by side in the intersection direction.

[0084] The magnet holding portion 431 has a third connection hole portion 458. The third connection hole portion 458 is a connection hole portion that connects the pair of second magnet holes 452a and 452b. The third connection hole portion 458 connects the end portion on the second magnet hole 452b side in the first hole portion 455a of the second magnet hole 452a and the end portion on the second magnet hole 452a side in the first hole portion 456a of the second magnet hole 452b. The shape of the hole formed by the first hole portion 455a, the first hole portion 456a, and the third connection hole portion 458 is the same as the shape of the second magnet hole 352 of the third embodiment when viewed in the axial direction. The third connection hole portion 458 extends in the radial direction. The circumferential center position of the third connection hole portion 458 is the same as the circumferential position of the magnetic pole center line Ld.

[0085] The magnet holding portion 431 has a third partition portion 438. The third partition portion 438 is a partition portion that separates the pair of second magnet holes 452a and 452b. The third partition portion 438 separates the end portion on the second magnet hole 452b side in the second hole portion 455b of the second magnet hole 452a and the end portion on the second magnet hole 452a side in the second hole portion 456b of the second magnet hole 452b. The third partition portion 438 overlaps the third connection hole portion 458 when viewed in the axial direction. The third partition portion 438 extends in the radial direction. The circumferential center position of the third partition portion 438 is the same as the circumferential position of the magnetic pole center line Ld.

[0086] The magnet holding portion 431 has fourth connection hole portions 459a and 459b. The fourth connection hole portion 459a is a connection hole portion that connects the first hole portion 453a of the first magnet hole 451a and the radially outer surface 430s of the rotor core body 430a. The fourth connection hole portion 459b is a connection hole portion that connects the first hole portion 454a of the first magnet hole 451b and the radially outer surface 430s of the rotor core body 430a. The first magnet holes 451a and 451b open to the radially outer surface 430s via the fourth connection hole portions 459a and 459b. In the present embodiment, the fourth connection hole portions 459a and 459b are provided in the magnet holding portion 431 where the third connection hole portion 458 is provided in each plate member 30b, that is, in the first magnet holding portion 431a.

[0087] The magnet holding portion 431 has fourth partition portions 439a and 439b. The fourth partition portion 439a is a partition portion that separates the radially outer surface 430s of the rotor core main body 430a from the second hole portion 453b of the first magnet hole 451a. The fourth partition portion 439b is a partition portion that separates the radially outer surface 430s of the rotor core main body 430a from the second hole portion 454b of the first magnet hole 451b. The fourth partition portions 439a and 439b extend in the circumferential direction. The radially outer surfaces of the fourth partition portions 439a and 439b constitute a part of the radially outer surface 430s of the rotor core main body 430a. The fourth partition portion 439a overlaps with the fourth connection hole portion 459a when viewed in the axial direction. The fourth partition portion 439b overlaps with the fourth connection hole portion 459b when viewed in the axial direction. In the present embodiment, the fourth partition portions 439a and 439b are provided in the magnet holding portion 431 where the third partition portion 438 is provided in each plate member 30b, that is, in the second magnet holding portion 431b.

[0088] The pair of first magnets 441a and 441b respectively arranged in the pair of first magnet holes 451a and 451b are the same as the pair of second magnets 42a and 42b in the first embodiment and the second embodiment. The pair of second magnets 442a and 442b respectively arranged in the pair of second magnet holes 452a and 452b extend in the tolerance direction in which the second magnet holes 452a and 452b respectively extend when viewed in the axial direction. In the present embodiment, each of the pair of second magnets 442a and 442b extends in a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction. The pair of second magnets 442a and 442b are arranged symmetrically with respect to the magnetic pole center line Ld when viewed in the axial direction. Other configurations of the second magnets 442a and 442b are the same as other configurations of each magnet 40 in the first embodiment.

[0089] Other configurations of each part of the rotor core 430 are the same as other configurations of each part of the rotor core 330 in the third embodiment. Other configurations of each part of the rotor 410 are the same as other configurations of each part of the rotor 310 in the third embodiment.

[0090] According to this embodiment, the third connection hole portion 458 is a connection hole portion that connects the pair of second magnet holes 452a and 452b. The third partition portion 438 is a partition portion that separates the pair of second magnet holes 452a and 452b. The third partition portion 438 overlaps with the third connection hole portion 458 when viewed in the axial direction. Therefore, while suppressing the leakage of magnetic flux in the radial direction between the pair of second magnet holes 452a and 452b, the strength of the portion of the rotor core 430 where the pair of second magnet holes 452a and 452b are provided can be ensured.

[0091] Also, according to this embodiment, the fourth connection hole portion 459a is a connection hole portion that connects the first hole portion 453a and the radially outer surface 430s of the rotor core main body 430a. The fourth partition portion 439a is a partition portion that separates the radially outer surface 430s of the rotor core main body 430a and the second hole portion 453b. The fourth partition portion 439a overlaps with the fourth connection hole portion 459a when viewed in the axial direction. Therefore, while suppressing the leakage of magnetic flux in the circumferential direction between the first magnet hole 451a and the radially outer surface 430s, the strength of the portion of the rotor core 430 where the first magnet hole 451a is provided can be ensured. This effect can be similarly obtained by the fourth connection hole portion 459b and the fourth partition portion 439b.

[0092] In each magnet holding portion 431, the plate member 30b provided with the third connection hole portion 458 may be a plate member 30b different from the plate members 30b provided with the fourth connection hole portions 459a and 459b. That is, the first magnet holding portion 431a may have the third connection hole portion 458 and the fourth partition portions 439a and 439b, and the second magnet holding portion 431b axially connected to the first magnet holding portion 431a may have the fourth connection hole portions 459a and 459b and the third partition portion 438. Also, in each magnet holding portion 431, the plate member 30b provided with the fourth connection hole portion 459a may be a plate member 30b different from the plate member 30b provided with the fourth connection hole portion 459b. That is, the first magnet holding portion 431a may have the fourth connection hole portion 459a and the fourth partition portion 439b, and the second magnet holding portion 431b axially connected to the first magnet holding portion 431a may have the fourth connection hole portion 459b and the fourth partition portion 439a.

[0093] The present invention is not limited to the above-described embodiments, and other configurations and other methods can also be adopted within the scope of the technical idea of the present invention. The magnet hole having the first hole portion and the second hole portion may be provided at least one in a plurality of magnet holes. The connection hole portion and the partition portion only need to overlap each other at least one by one when viewed in the axial direction. When a plurality of connection hole portions and a plurality of partition portions are provided respectively, the plurality of connection hole portions and the plurality of partition portions may be arranged in any manner along the axial direction. The connection hole portion and the partition portion may be arranged alternately one by one along the axial direction. The connection hole portion may be provided in any manner as long as it connects the first hole portion and either one of a magnet hole different from the magnet hole in which the first hole portion is provided or a radially outer surface portion of the rotor core body. Only one of the connection hole portions in each of the above-described embodiments may be provided, or two or more arbitrary connection hole portions in each of the above-described embodiments may be provided.

[0094] The connection hole portion may include any one or more of the first connection hole portion, the second connection hole portion, the third connection hole portion, and the fourth connection hole portion, or may include a connection hole portion other than the first connection hole portion, the second connection hole portion, the third connection hole portion, and the fourth connection hole portion. The partition wall portion may include any one or more of the first partition wall portion, the second partition wall portion, the third partition wall portion, and the fourth partition wall portion, or may include a partition wall portion other than the first partition wall portion, the second partition wall portion, the third partition wall portion, and the fourth partition wall portion. For example, in the above-described third embodiment, a connection hole portion connecting one end portion of the second magnet hole 352 in the direction in which the second magnet hole 352 extends when viewed in the axial direction and either one of the first magnet hole 351a and the first magnet hole 351b may be provided. The shape of the connection hole portion and the shape of the partition wall portion are not particularly limited.

[0095] The second magnet hole may be a magnet hole having any shape and disposed at any position as long as it is a magnet hole different from the pair of first magnet holes. The number of second magnet holes provided in the magnet holding portion is not particularly limited.

[0096] The pair of protrusions may be provided on the inner surface of the first hole portion. In this case, the pair of protrusions may also be provided on the inner surface of the second hole portion, or the pair of protrusions may not be provided on the inner surface of the second hole portion.

[0097] When the plate members adjacent to each other in the axial direction are laminated with a circumferential displacement relative to each other, the circumferential angle θ by which the plate members are displaced relative to each other is not particularly limited. The angle θ by which the plate members adjacent to each other in the axial direction are displaced in the circumferential direction may be, for example, 45° or 180°. The plurality of plate members constituting the rotor core body may include two or more types of plate members having different shapes. The caulking portion for fixing the plate members may be provided at any position. The plate members may be fixed to each other by means other than the caulking portion. In each plate member, the magnet holding portion provided with the first hole portion and the connection hole portion and the magnet holding portion provided with the second hole portion and the partition portion may be arranged in any manner. The plurality of plate members may include a plate member provided with the first hole portion and the connection hole portion and not provided with the second hole portion and the partition portion, or may include a plate member provided with the second hole portion and the partition portion and not provided with the first hole portion and the connection hole portion.

[0098] The rotating electrical machine to which the present invention is applied is not limited to a motor and may be a generator. The use of the rotating electrical machine is not particularly limited. The rotating electrical machine may be mounted on equipment other than vehicles. The use of the drive device to which the present invention is applied is not particularly limited. The drive device may be mounted on a vehicle for uses other than rotating an axle, for example, or may be mounted on equipment other than vehicles. The attitude when the rotating electrical machine and the drive device are used is not particularly limited. The central axis of the rotating electrical machine may be inclined with respect to the horizontal direction orthogonal to the vertical direction or may extend in the vertical direction. As described above, the configurations described in this specification can be appropriately combined within a range that does not conflict with each other.

Explanation of Signs

[0099] 10, 210, 310, 410… rotor, 30, 230, 330, 430… rotor core, 30a, 430a… rotor core body, 30b, 30c, 30d… plate member, 31, 231, 331, 431… magnet holding part, 32a, 33a, 34a, 35a… protrusion part, 36… caulking part, 37, 337… first partition part (partition part), 40… magnet, 41a, 41b, 341a, 341b, 441a, 441b… first magnet (magnet), 42a, 42b, 342, 442a, 442b… second magnet (magnet), 50… magnet hole, 51a, 51b, 351a, 351b, 451a, 451b… first magnet hole, 52, 52a, 52b, 252a, 252b, 352, 452a, 452b… second magnet hole, 53a, 54a, 55a, 56a, 255a, 256a, 453a, 454a, 455a, 456a… first hole part, 53b, 54b, 55b, 56b, 255b, 256b, 453b, 454b, 455b, 456b… second hole part, 57, 357… first connection hole part (connection hole part), 60… rotating electric machine, 61… stator, 70… gear mechanism, 100… driving device, 238… second partition part (partition part), 258… second connection hole part (connection hole part), 430s… radially outer surface, 438… third partition part (partition part), 439a, 439b… fourth partition part (partition part), 458… third connection hole part (connection hole part), 459a, 459b… fourth connection hole part (connection hole part), J… central axis, RE1, RE2… region

Claims

1. A rotor core of a rotor rotatable about a central axis, comprising: a rotor core body formed by laminating a plurality of plate members in the axial direction; the rotor core body having a magnet holding portion with a plurality of magnet holes; the plurality of magnet holes including: a pair of first magnet holes adjacent to each other in the circumferential direction; and a second magnet hole different from the pair of first magnet holes; wherein the pair of first magnet holes extend in a direction away from each other in the circumferential direction as they extend from the radially inner side to the radially outer side when viewed in the axial direction; at least one of the plurality of magnet holes has: a first hole portion provided in at least one of the plurality of plate members; and a second hole portion provided in at least one plate member different from the plate member in which the first hole portion is provided and axially connected to the first hole portion; wherein the magnet holding portion has: a connection hole portion provided in the plate member in which the first hole portion is provided; and a partition portion provided in the plate member in which the second hole portion is provided; and a plurality of the connection hole portions and the partition portions are provided along the circumferential direction; the connection hole portion connects the first hole portion to either another magnet hole different from the magnet hole in which the first hole portion is provided or a portion of the radially outer surface of the rotor core body; the partition portion separates the one portion from the second hole portion and overlaps the connection hole portion when viewed in the axial direction; each magnet holding portion has a first magnet holding portion and a second magnet holding portion laminated in the axial direction; the first magnet holding portion has the first hole portion and the connection hole portion; the second magnet holding portion has the second hole portion and the partition portion; each of the plurality of plate members has a first region and a second region adjacent to each other in the circumferential direction; the portion of the magnet holding portion provided in the first region is the first magnet holding portion; a plurality of the first magnet holding portions are provided side by side in the circumferential direction in the first region; the portion of the magnet holding portion provided in the second region is the second magnet holding portion; a plurality of the second magnet holding portions are provided side by side in the circumferential direction in the second region; the first magnet holding portion and the second magnet holding portion have different shapes when viewed in the axial direction. A rotor core.

2. In each of the plurality of plate members, the first magnet holding portion provided with the first hole portion and the connection hole portion and the second magnet holding portion provided with the second hole portion and the partition portion are located on opposite sides in the radial direction with respect to the central axis. The rotor core according to claim 1.

3. On at least one inner surface of the first hole portion and the second hole portion, a pair of protrusions for sandwiching a magnet disposed in the magnet hole are provided. The rotor core according to claim 1 or 2.

4. On the inner surface of the first hole portion of the first magnet holding portion and the inner surface of the second hole portion of the second magnet holding portion, the pair of protrusions are provided only on the inner surface of the second hole portion of the second magnet holding portion. The rotor core according to claim 3.

5. The connection hole portion includes a first connection hole portion that connects the radially inner ends of the pair of first magnet holes. The partition portion includes a first partition portion that separates the radially inner ends of the pair of first magnet holes. The first partition portion overlaps with the first connection hole portion when viewed in the axial direction. The rotor core according to any one of claims 1 to 4.

6. A rotor core of a rotor rotatable about a central axis, Comprising a rotor core body formed by laminating a plurality of plate members in the axial direction. The rotor core body has a magnet holding portion having a plurality of magnet holes. The plurality of magnet holes are A pair of first magnet holes adjacent to each other in the circumferential direction, A second magnet hole different from the pair of first magnet holes, Including The pair of first magnet holes extend in a direction away from each other in the circumferential direction as they go from the radially inner side to the radially outer side when viewed in the axial direction. At least one of the plurality of magnet holes is A first hole portion provided in at least one of the plurality of plate members, Provided in at least one plate member different from the plate member provided with the first hole portion, and a second hole portion axially connected to the first hole portion. Having The magnet holding portion is A connection hole portion provided in the plate member provided with the first hole portion, A partition portion provided in the plate member provided with the second hole portion, Having The connection hole portion connects the first hole portion to either another magnet hole different from the magnet hole provided with the first hole portion or a portion of the radially outer surface of the rotor core body. The partition portion separates the one part and the second hole portion, and overlaps with the connection hole portion when viewed in the axial direction. The connection hole portion includes a first connection hole portion that connects the radially inner ends of the pair of first magnet holes. The partition portion includes a first partition portion that separates the radially inner ends of the pair of first magnet holes. The first partition portion overlaps with the first connection hole portion when viewed in the axial direction. The magnet holding portion has a first magnet holding portion and a second magnet holding portion laminated in the axial direction. The first magnet holding portion has the first hole portion and the first connection hole portion. The second magnet holding portion has the second hole portion and the first partition portion. A rotor core, wherein on the inner side surface of the first hole portion of the first magnet holding portion and the inner side surface of the second hole portion of the second magnet holding portion, a pair of protrusions for sandwiching a magnet disposed in the magnet hole are provided only on the inner side surface of the second hole portion of the second magnet holding portion.

7. The rotor core according to claim 5 or 6, wherein an edge portion located in the radial direction among the inner edge portions of the first connection hole portion extends linearly when viewed in the axial direction.

8. The rotor core body has a caulking portion for fixing the plate members adjacent to each other in the axial direction. The caulking portion is located between the pair of first magnet holes in the circumferential direction. The rotor core according to any one of claims 5 to 7, wherein the circumferential position of the caulking portion includes the circumferential center position of the first partition portion.

9. The plurality of magnet holes include a pair of second magnet holes adjacent to each other in the circumferential direction. The pair of second magnet holes are located radially inside the pair of first magnet holes, and extend in a direction away from each other in the circumferential direction as going from the radially inner side to the radially outer side when viewed in the axial direction. The radially inner ends of the pair of second magnet holes are arranged apart from each other in the circumferential direction. The rotor core according to any one of claims 5 to 8, wherein a minimum value in the circumferential dimension of the first partition portion is smaller than a minimum value in the circumferential distance between the radially inner ends of the pair of second magnet holes.

10. The plurality of magnet holes include a pair of second magnet holes adjacent to each other in the circumferential direction. The pair of second magnet holes are located radially inside the pair of first magnet holes and, when viewed in the axial direction, extend in a direction in which they are separated from each other in the circumferential direction as they go from the radially inner side to the radially outer side. The rotor core according to any one of claims 1 to 8.

11. The connection hole portion includes a second connection hole portion that connects the radially inner ends of the pair of second magnet holes. The partition portion includes a second partition portion that separates the radially inner ends of the pair of second magnet holes. The second partition portion overlaps the second connection hole portion when viewed in the axial direction. The rotor core according to claim 9 or 10.

12. The second magnet holes are located between the circumferential directions of the radially outer ends of the pair of first magnet holes and, when viewed in the axial direction, extend in an intersection direction that intersects the radial direction. The rotor core according to any one of claims 1 to 8.

13. A pair of the second magnet holes are provided side by side in the intersection direction. The connection hole portion includes a third connection hole portion that connects the pair of second magnet holes. The partition portion includes a third partition portion that separates the pair of second magnet holes. The third partition portion overlaps the third connection hole portion when viewed in the axial direction. The rotor core according to claim 12.

14. A plurality of the magnet holding portions are provided along the circumferential direction. Each of the plurality of plate members has the first magnet holding portion in one of the magnet holding portions and the second magnet holding portion in another of the magnet holding portions. The rotor core according to claim 6.

15. In each of the plurality of plate members, the first magnet holding portion provided with the first hole portion and the connection hole portion and the second magnet holding portion provided with the second hole portion and the partition portion are located on opposite sides in the radial direction with the central axis interposed therebetween. The rotor core according to claim 14.

16. In each of the plurality of plate members, the first magnet holding portion provided with the first hole portion and the connection hole portion and the second magnet holding portion provided with the second hole portion and the partition portion are respectively arranged in different circumferentially adjacent regions, and a plurality of each are provided along the circumferential direction in each of the regions. The rotor core according to claim 14 or 15.

17. The plurality of plate members have the same shape as each other. The rotor core according to any one of claims 1 to 16, wherein the plate members adjacent to each other in the axial direction are laminated with a circumferential shift relative to each other.

18. The connection hole portion includes a fourth connection hole portion that connects the first hole portion and the radially outer surface of the rotor core body. The partition wall portion includes a fourth partition wall portion that separates the radially outer surface of the rotor core body and the second hole portion. The rotor core according to any one of claims 1 to 17, wherein the fourth partition wall portion overlaps the fourth connection hole portion when viewed in the axial direction.

19. A rotor core according to any one of claims 1 to 18, and a rotor having a plurality of magnets respectively disposed in the plurality of magnet holes, A stator facing the rotor with a gap therebetween, A rotating electrical machine comprising the same.

20. A rotating electrical machine according to claim 19, A gear mechanism connected to the rotating electrical machine, A drive device comprising the same.

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