JP2023030838A - Rotor core, rotary electric machine, and drive unit - Google Patents

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

The present invention relates to rotor cores, rotating electric machines, and drive devices.

A rotary electric machine is known which includes a rotor core having a pair of substantially V-shaped magnet insertion holes. For example, Patent Literature 1 describes, as such a rotating electrical machine, a rotating electrical machine in which a bridge portion separating a pair of magnet insertion holes is provided in a rotor core.

JP 2019-161750 A

In the rotor core as described above, for example, magnetic flux may leak radially inward from the bridge portion, which may reduce the output of the rotating electric machine. On the other hand, if the bridge portion is made thin or if the bridge portion is eliminated and the magnet insertion holes are connected to each other, it is possible to suppress the leakage of the magnetic flux radially inward, and it is possible to suppress the decrease in the output of the rotating electric machine. . However, in this case, the strength of the rotor core is reduced, which may cause problems such as deformation of the magnet insertion holes.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a rotor core having a structure capable of suppressing leakage of magnetic flux while ensuring strength, a rotating electric machine including such a rotor core, and a drive apparatus including such a rotating electric machine. One of the purposes is to

One aspect of the rotor core of the present invention is a rotor core of a rotor rotatable about a central axis, which includes a rotor core body configured by stacking a plurality of plate members in the axial direction. The rotor core body has a magnet holder having a plurality of magnet holes. The plurality of magnet holes includes 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. When viewed in the axial direction, the pair of first magnet holes extend circumferentially away from each other from the radially inner side toward the radially outer side. At least one of the plurality of magnet holes includes a first hole provided in at least one of the plurality of plate members and at least one different from the plate member in which the first hole is provided. and a second hole provided in the plate member and axially connected to the first hole. The magnet holding portion has a connection hole provided in the plate member provided with the first hole, and a partition wall provided in the plate member provided with the second hole. The connection hole portion includes the first hole portion and either a 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. connected. The partition wall separates the one portion and the second hole, and overlaps the connection hole when viewed in the axial direction.

One aspect of the rotating electric machine of the present invention includes the rotor core described above, a rotor having a plurality of magnets arranged in the plurality of magnet holes, and a stator facing the rotor with a gap therebetween.

One aspect of the drive device of the present invention includes the rotating electric machine described above and a gear mechanism connected to the rotating electric machine.

ADVANTAGE OF THE INVENTION According to one aspect of this invention, in a rotary electric machine and a drive device, it is possible to suppress the leakage of magnetic flux while ensuring the strength of the rotor core.

FIG. 1 is a diagram schematically showing the drive device of the first embodiment. FIG. 2 is a cross-sectional view showing the rotor of the first embodiment. FIG. 3 is a perspective view showing part of the rotor core of the first embodiment. FIG. 4 is a sectional view showing part of the rotor of the first embodiment, and is a sectional view showing part of one plate member and part of the magnet. FIG. 5 is a sectional view showing part of the rotor of the first embodiment, and is a sectional view showing part of another plate member and part of the magnet. FIG. 6 is an axial view of one plate member in the first embodiment. FIG. 7 is an axial view of another plate member in the first embodiment. FIG. 8 is a cross-sectional view showing part of the rotor in the second embodiment. FIG. 9 is a cross-sectional view showing part of the rotor in the third embodiment. FIG. 10 is a cross-sectional view showing part of the rotor in the fourth embodiment.

In the following description, the vertical direction is defined based on the positional relationship when the drive system of the embodiment is mounted on a vehicle positioned on a horizontal road surface. In other words, the relative positional relationship in the vertical direction, which will be described in the following embodiments, should be satisfied at least when the driving device is mounted on a vehicle positioned on a horizontal road surface.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is vertically upward, and the -Z side is vertically downward. In the following description, the vertically upper side is simply called "upper side", and the vertically lower side is simply called "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.

Note that the positional relationship in the longitudinal 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. Moreover, in this specification, the “parallel direction” includes substantially parallel directions, and the “perpendicular direction” includes substantially perpendicular directions.

A central axis J appropriately shown in the drawings is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, in the lateral 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 about the central axis J is simply referred to as the "radial direction", and the central axis J is referred to as the "radial direction". The circumferential direction around the center, that is, the circumference of the central axis J is simply referred to as the "circumferential direction".

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

Housing 80 accommodates rotating electrical machine 60 and gear mechanism 70 therein. The housing 80 has a motor housing 81 that houses the rotating electric machine 60 therein, and a gear housing 82 that houses the gear mechanism 70 therein. In this embodiment, oil O is accommodated inside the motor housing 81 and inside the gear housing 82 .

Gear mechanism 70 transmits rotation of rotating electric machine 60 to axle 73 of the vehicle. The gear mechanism 70 has a reduction gear 71 connected to the rotating electric machine 60 and a differential gear 72 connected to the reduction gear 71 . An axle 73 is connected to the differential gear 72 .

The rotary electric machine 60 includes a rotor 10 rotatable around a central axis J, and a stator 61 facing the rotor 10 with a gap therebetween. In this embodiment, the stator 61 is positioned 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 .

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 around the central axis J. As shown in FIG. The left (+Y side) end of the shaft 20 protrudes into the gear housing 82 .

Rotor core 30 is fixed to the outer peripheral surface of shaft 20 . As shown in FIG. 2, the rotor core 30 has a cylindrical shape centered on the central axis J. As shown in FIG. Rotor core 30 has a central hole 30h that axially penetrates rotor core 30 . The central hole 30h is a circular hole centered on the central axis J. As shown in FIG. The shaft 20 is axially passed through the central hole 30h. The inner peripheral surface of the central hole 30 h is fixed to the outer peripheral surface of the shaft 20 .

The rotor core 30 includes a rotor core body 30a. In this embodiment, the rotor core 30 consists of only the rotor core main 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 stacking a plurality of plate members 30b in the axial direction. The plate member 30b is a plate-shaped member whose plate surface faces the axial direction. The plate member 30b is disc-shaped with the central axis J as the center. The plate member 30b is, for example, an electromagnetic steel plate.

As shown in FIG. 2, the rotor core body 30a has a magnet holding portion 31 having a plurality of magnet holes 50. As shown in FIG. The magnet holding portion 31 is provided at a radially outer portion of the rotor core body 30a. In this embodiment, a plurality of magnet holding portions 31 are provided along the circumferential direction. The plurality of magnet holders 31 are arranged at regular intervals along the circumferential direction. In this embodiment, eight magnet holding portions 31 are provided.

In this embodiment, the plurality of magnet holes 50 axially penetrate the rotor core body 30a. As shown in FIGS. 4 and 5, in each magnet holding portion 31, the plurality of magnet holes 50 are a pair of first magnet holes 51a and 51b adjacent to each other in the circumferential direction and a pair of first magnet holes 51a. , and a second magnet hole 52 different from 51b. In each magnet holding portion 31 of the present embodiment, the second magnet hole 52 includes a pair of second magnet holes 52a and 52b adjacent in the circumferential direction. That is, in each magnet holding portion 31, the plurality of magnet holes 50 includes 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 including a pair of first magnet holes 51a and 51b and a pair of second magnet holes 52a and 52b.

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

The plurality of magnets 40 includes a pair of first magnets 41a and 41b respectively arranged in a pair of first magnet holes 51a and 51b and a pair of second magnets 41a and 41b respectively arranged in a pair of second magnet holes 52a and 52b. Magnets 42a, 42b are included. As shown in FIG. 2, a resin 90 is placed in each magnet hole 50 in a portion other than the portion where the magnet 40 is placed. In this embodiment, each magnet 40 is fixed in each magnet hole 50 by resin 90 . Note that illustration of the resin 90 is omitted in figures other than FIG. 2 . Moreover, 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 crimping a portion of the rotor core 30 .

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 a magnetic pole portion 10P. . A plurality of magnetic pole portions 10P are arranged at equal intervals over a circumference along the circumferential direction. In this embodiment, eight magnetic pole portions 10P are provided. The plurality of magnetic pole portions 10P include a plurality of magnetic pole portions 10N having N-pole magnetic poles on the outer peripheral surface of the rotor core 30 and a plurality of magnetic pole portions 10S having S-pole magnetic poles on the outer peripheral surface of the rotor core 30, respectively. In this 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 alternately arranged along the circumferential direction. The configuration of each magnetic pole portion 10P is the same except that the magnetic poles on the outer peripheral surface of the rotor core 30 are different and the positions in the circumferential direction are different.

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 to sandwich the magnetic pole center line Ld in the circumferential direction. The magnetic pole center line Ld is a virtual line passing through the circumferential center of the magnetic pole portion 10P and the central axis J and extending in the radial direction. A 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 line-symmetrically with respect to the magnetic pole center line Ld when viewed in the axial direction.

When viewed in the axial direction, the pair of first magnet holes 51a and 51b extend in directions away from each other in the circumferential direction from the radially inner side to the radially outer side. That is, the circumferential distance between the first magnet hole 51a and the first magnet hole 51b increases from the radially inner side to the radially outer side. The pair of first magnet holes 51a and 51b are arranged along a V-shape that widens in the circumferential direction toward the radially outer side 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 shape that widens in the circumferential direction toward the radially outer side when viewed in the axial direction.

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 to sandwich the pair of first magnet holes 51a and 51b in the circumferential direction. In the magnetic pole portion 10P, the second magnet hole 52a and the second magnet hole 52b are arranged so as to sandwich the magnetic pole center line Ld in the circumferential direction. The second magnet hole 52a and the second magnet hole 52b are arranged line-symmetrically with respect to the magnetic pole center line Ld when viewed in the axial direction.

When viewed in the axial direction, the pair of second magnet holes 52a and 52b extend in directions away from each other in the circumferential direction from the radially inner side toward the radially outer side. That is, the circumferential distance between the second magnet hole 52a and the second magnet hole 52b increases from the radially inner side to the radially outer side. In this embodiment, the radially inner ends of the pair of second magnet holes 52a and 52b are spaced apart in the circumferential direction. A bridge portion 37a is provided between the radial inner end portions of the pair of second magnet holes 52a and 52b.

The bridge portion 37a extends radially. 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 radial outer end of the bridge portion 37a increases radially outward. The circumferential dimension at the radially inner end portion of the bridge portion 37a increases radially inward.

The pair of second magnet holes 52a and 52b are arranged along a V shape that widens in the circumferential direction toward the radially outer side 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-shape that widens in the circumferential direction toward the radially outer side when viewed in the axial direction. In other words, in each magnetic pole portion 10P of the present embodiment, two pairs of magnets 40 arranged along the V-shape when viewed in the axial direction are provided side by side in the radial direction. By arranging the four magnets 40 in each magnetic pole portion 10</b>P in such an arrangement, the magnetic flux can be preferably caused to flow between the rotor 10 and the stator 61 . Thereby, the output of the rotary electric machine 60 can be preferably obtained.

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.

Each magnet 40 in each magnet hole 50 is arranged apart from both ends in the direction in which each magnet hole 50 extends, when viewed in the axial direction. As a result, 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 this embodiment, each flux barrier portion 50f is formed by filling a part of the magnet hole 50 with a resin 90. As shown in FIG.

In this specification, "the direction in which the magnet extends when viewed in the axial direction" refers to, for example, the first magnets 41a and 41b of the present embodiment having a rectangular shape when viewed in the axial direction. is the direction in which the long side of That is, for example, in the present embodiment, "the direction in which the first magnet 41a extends when viewed in the axial direction" is the direction in which the long side of the rectangular first magnet 41a extends when viewed in the axial direction.

Further, in this specification, the term “flux barrier portion” means a portion capable of suppressing the flow of magnetic flux. In other words, 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 void portion or a non-magnetic portion other than resin.

In each magnet hole 50 of the present embodiment, each magnet 40 is in contact with the inner surface of each magnet hole 50 located radially outward in the direction orthogonal to the direction in which each magnet hole 50 extends when viewed in the axial direction. are doing. A concave portion 50e is provided on the inner side surface of each magnet hole 50, which is positioned radially inward in a direction perpendicular to the direction in which each magnet hole 50 extends when viewed in the axial direction. A resin 90 is filled in the concave portion 50e. By providing the concave portion 50 e , 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 .

As shown in FIG. 3, the first magnet hole 51a includes a first hole portion 53a provided in at least one of the plurality of plate members 30b and at least one hole different from the plate member 30b in which the first hole portion 53a is provided. and a second hole portion 53b provided in one plate member 30b. The second hole portion 53b is axially connected to the first hole portion 53a. In this 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. For example, two first hole portions 53a and two second hole portions 53b are provided alternately along the axial direction.

The first magnet hole 51b is provided in at least one plate member 30b different from the plate member 30b provided with the first hole portion 54a provided in at least one of the plurality of plate members 30b and the first hole portion 54a. and a second hole portion 54b. The second hole portion 54b is axially connected to the first hole portion 54a. In this 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. For example, two first hole portions 54a and two second hole portions 54b are provided alternately along the axial direction.

The second magnet hole 52a is provided in at least one plate member 30b different from the plate member 30b in which the first hole portion 55a is provided in at least one of the plurality of plate members 30b and the first hole portion 55a is provided. and a second hole portion 55b. 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. For example, two first hole portions 55a and two second hole portions 55b are provided alternately along the axial direction.

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

As shown in FIG. 5, in the present embodiment, a pair of protrusions 32a are provided on the inner side surface of the second hole 53b so as to sandwich the first magnet 41a arranged in the first magnet hole 51a. 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 when viewed in the axial direction. In the present embodiment, the pair of projecting portions 32a protrude radially outward from the radially inner side surface in the direction perpendicular to the direction in which the first magnet hole 51a extends when viewed in the axial direction. As shown in FIG. 4, the pair of projections 32a are not provided on the inner side surface of the first hole 53a.

As shown in FIG. 3, a pair of protrusions 32 are formed by a pair of projections 32a in a plurality of axially stacked second holes 53b. The convex portion 32 extends in the axial direction. Each projection 32 is composed of a plurality of protrusions 32a arranged along the axial direction. In the present embodiment, the convex portion 32 is configured by providing a plurality of two projecting portions 32a that are axially overlapped with a gap therebetween along the axial direction. Although not shown, a resin 90 is placed in the gap between the two protrusions 32a and the other two protrusions 32a adjacent in the axial direction. The pair of protrusions 32 sandwich the first magnet 41a arranged in the first magnet hole 51a.

As shown in FIG. 5, a pair of protrusions 33a are provided on the inner side surface of the second hole 54b so as to sandwich the first magnet 41b arranged in the first magnet hole 51b. A pair of projecting portions 34a are provided on the inner side surface of the second hole portion 55b so as to sandwich the second magnet 42a arranged in the second magnet hole 52a. A pair of projecting portions 35a are provided on the inner side surface of the second hole portion 56b so as to sandwich the second magnet 42b arranged 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 side surface of the first magnet hole 51b. The pair of protrusions 34a is the same as the pair of protrusions 32a except that they are provided on the inner side surface of the second magnet hole 52a. The pair of protrusions 35a is the same as the pair of protrusions 32a except that they are provided on the inner side surface of the second magnet hole 52b. As shown in FIG. 4, the pair of protrusions are not provided on the inner side surfaces of the first holes 54a, 55a, and 56a.

As shown in FIG. 3, a pair of projections 33 are formed by a pair of projections 33a in a plurality of second holes 54b that are axially stacked. A pair of protrusions 34 are formed by a pair of protrusions 34a in the plurality of second holes 55b that are axially stacked. A pair of protrusions 35 is formed by a pair of protrusions 35a in the plurality of second holes 56b that are axially stacked. Each protrusion 33 , 34 , 35 is similar to protrusion 32 except that the magnet holes 50 provided therein are different.

By providing the pair of projections 32a, 33a, 34a, 35a on the inner side surface of each hole as described above, the position of each magnet 40 is determined to some extent by the pair of projections 32a, 33a, 34a, 35a. be able to. Therefore, each magnet 40 can be preferably arranged in each magnet hole 50 .

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 provided with the first hole portions 53a and 54a. The first connection hole portion 57 is a connection hole portion that connects the radial inner end portions of the pair of first magnet holes 51a and 51b. The first connection hole portion 57 connects the radial inner end portion of the first hole portion 53a and the radial inner end portion 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. I'm in. 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. I'm in.

In the present embodiment, of the inner edge portion of the first connection hole portion 57, the edge portion located in the radial direction extends linearly when viewed in the axial direction. The radially outer edge portion of the inner edge portion of the first connection hole portion 57 extends in a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction, and is the radially outer edge portion of the first hole portion 53a. and the radially outer edge of the first hole portion 54a. The radially inner edge portion of the inner edge portion of the first connection hole portion 57 extends in a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction, and the radially inner edge portion of the first hole portion 53a and the radially inner edge of the first hole portion 54a.

As shown in FIG. 5 , the magnet holding portion 31 has a first partition portion 37 . The first partition wall portion 37 is part of the plate member 30b. The first partition wall 37 is provided on the plate member 30b provided with the second holes 53b and 54b. The first partition wall portion 37 is a partition wall portion that separates the radial inner end portions of the pair of first magnet holes 51a and 51b. In this embodiment, the first partition wall portion 37 is arranged so that the radially inner end portion of the second hole portion 53b of the first magnet hole 51a and the radially inner end portion of the second hole portion 54b of the first magnet hole 51b are separated in the circumferential direction. separated by That is, the first partition wall portion 37 separates the first magnet hole 51a and the second hole portion 54b. Further, the first partition wall portion 37 separates the first magnet hole 51b and the second hole portion 53b.

The first partition wall portion 37 extends radially. The first partition wall portion 37 has a substantially rectangular shape that is elongated in the radial direction when viewed in the axial direction. The circumferential center position of the first partition wall portion 37 is the same as the circumferential position of the magnetic pole center line Ld. The circumferential dimension at the radially outer end portion of the first partition wall portion 37 increases toward the radially outer side. The circumferential dimension at the radial inner end portion of the first partition wall portion 37 increases radially inward. The minimum value of the circumferential dimension L1 of the first partition wall 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. In the present embodiment, the minimum value of the circumferential dimension L1 of the first partition 37 is the value of the circumferential dimension of the portion of the first partition 37 excluding both ends in the radial direction. In this embodiment, the minimum value of the circumferential distance L2 between the radially inner ends of the pair of second magnet holes 52a and 52b is is the value of the dimension of

As shown in FIGS. 3 and 4, the first partition wall portion 37 overlaps the first connection hole portion 57 when viewed in the axial direction. As shown in FIG. 3, in the present embodiment, two first partition wall portions 37 and two first connection hole portions 57 are alternately arranged along the axial direction. Although not shown, a resin 90 is placed in the first connection hole portion 57 . In other words, the resin 90 is arranged between the first partition wall portions 37 adjacent to each other in the axial direction with the first connection hole portion 57 interposed therebetween.

4 and 6 show one plate member 30c of the plurality of plate members 30b. First holes 53a, 54a, 55a, and 56a and a first connection hole 57 are formed in a portion of the plate member 30c that constitutes a part of the magnet holding portion 31 positioned on the uppermost side in FIGS. is provided. 5 and 7 show another plate member 30d different from the plate member 30c among the plurality of plate members 30b. Second holes 53b, 54b, 55b, and 56b and a first partition wall 37 are provided in a portion of the plate member 30d that constitutes a part of the magnet holding portion 31 positioned on the uppermost side in FIGS. It is 4 to 7 show the case where the circumferential position of the rotor 10 is the same. The plate member 30c and the plate member 30d are, for example, the plate member 30b laminated adjacent to each other in the axial direction.

In this 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 holder 31a has first holes 53a, 54a, 55a, 56a and a first connection hole 57. As shown in FIGS. The second magnet holding portion 31 b has second holes 53 b , 54 b , 55 b , 56 b and a first partition wall portion 37 .

In this embodiment, each plate member 30b is provided with a plurality of first magnet holding portions 31a and a plurality of second magnet holding portions 31b. That is, each of the plurality of plate members 30b has the first hole portions 53a and 54a and the first connection hole portion 57 in one magnet holding portion 31, and the second hole portions 53b and 54b and the second hole portion 53b and 54b in the other magnet holding portion 31. 1 partition wall portion 37 .

In each plate member 30b, a second magnet holding portion 31b is arranged at a position that sandwiches the central axis J in the radial direction between the plate member 30b and the first magnet holding portion 31a. In each plate member 30b, the first magnet holding portion 31a is arranged at a position that sandwiches the central axis J in the radial direction between the plate member 30b and 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 holes 53a and 54a and the first connection hole 57, the second holes 53b and 54b, and the first partition wall The magnet holding portion 31 provided with the portion 37 is located on the opposite side in the radial direction with the central axis J interposed therebetween.

In this embodiment, the plurality of first magnet holding portions 31a and the plurality of second magnet holding portions 31b are arranged together 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 arranged in different regions RE1 and RE2 adjacent to each other in the circumferential direction. In FIG. 6, the regions RE1 and RE2 are separated by an imaginary line IL1 passing through the central axis J when viewed in the axial direction. In FIG. 7, the regions RE1 and RE2 are separated by an imaginary line IL2 passing through the central axis J when viewed in the axial direction. The virtual line IL1 and the virtual line IL2 are orthogonal to each other when viewed in the axial direction.

Each of the regions RE1 shown in FIGS. 6 and 7 is provided with four first magnet holding portions 31a. Each of the regions RE2 shown in FIGS. 6 and 7 is provided with four second magnet holding portions 31b. In FIGS. 6 and 7, the regions RE1 and RE2 are semicircular arc regions with an angle of 180° in the circumferential direction. In FIG. 6, the region RE1 and the region RE2 are arranged to sandwich the virtual line IL1 in the radial direction. In FIG. 7, the region RE1 and the region RE2 are arranged so as to sandwich the virtual line IL2 in the radial direction. A portion of the region RE1 shown in FIG. 6 and a portion of the region RE2 shown in FIG. 7 overlap when viewed in the axial direction. A portion of the region RE2 shown in FIG. 6 and a portion of the region RE1 shown in FIG. 7 overlap when viewed in the axial direction.

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 and 54a and the first connection hole portion 57, the second hole portions 53b and 54b and the second The magnet holding portions 31 provided with 1 partition wall portions 37 are arranged in different regions RE1 and RE2 adjacent to each other in the circumferential direction, and a plurality of magnet holding portions 31 are provided along the circumferential direction in each of the regions RE1 and RE2. .

As shown in FIGS. 6 and 7, the plurality of plate members 30b in this embodiment have the same shape. The plate members 30b adjacent to each other in the axial direction are laminated while being displaced from each other in the circumferential direction. As shown in FIGS. 6 and 7, in the present embodiment, an angle θ at which axially adjacent plate members 30b are displaced in the circumferential direction is 90°. That is, in the present embodiment, the rotor core body 30a is made by laminating plate members 30b having the same shape while rotating them in the circumferential direction by 90°. In FIG. 7, the angle θ is the circumferential angle formed by the imaginary line IL1 and the imaginary line IL2.

As shown in FIGS. 4 and 5, the rotor core body 30a has a crimped portion 36 that fixes axially adjacent plate members 30b to each other. The crimped portion 36 is provided on each plate member 30b. The crimped portion 36 is a portion formed by crimping a portion of the plate member 30b in the axial direction. In this embodiment, the crimped portion 36 is formed by crimping a part of the plate member 30b to the right side (-Y side). By providing the crimped portion 36, the plate member 30b is provided with a concave portion 36a recessed to the right side. A crimped portion 36 provided on one plate member 30b is fitted and fixed to a recessed portion 36a provided on another plate member 30b adjacent to the right side of the one plate member 30b. As a result, the plate members 30b adjacent to each other in the axial direction are fixed by the caulked portion 36. As shown in FIG.

The crimped portion 36 is located between the pair of first magnet holes 51a and 51b in the circumferential direction. The circumferential position of the crimped portion 36 includes the circumferential center position of the first partition wall portion 37 . In the present embodiment, the center position of the crimped portion 36 in the circumferential direction is the same as the center position of the first partition wall portion 37 in the circumferential direction. The circumferential center position of the crimped portion 36 is the same as the circumferential position of the magnetic pole center line Ld. 4 and 5, illustration of the crimped portion 36 is omitted.

According to the present embodiment, the first magnet hole 51a is at least different from the first hole 53a provided in at least one of the plurality of plate members 30b and the plate member 30b provided with the first hole 53a. A second hole portion 53b is provided in one plate member 30b and axially connected to the first hole portion 53a. The magnet holding portion 31 includes a first connection hole portion 57 provided in the plate member 30b provided with the first hole portion 53a, and a first partition portion provided in the plate member 30b provided with the second hole portion 53b. 37 and . The first connection hole portion 57 is provided with a 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, a first hole portion 54a in the present embodiment. and the first magnet hole 51b. The first partition wall 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, making it difficult for magnetic flux to pass between the first magnet hole 51a and the first magnet hole 51b. In other words, since the first connecting hole portion 57 is provided, the magnetic material portion provided between the first magnet hole 51a and the first magnet hole 51b can be reduced. It is possible to make it difficult for magnetic flux to pass between Therefore, magnetic flux can be prevented from leaking from between the first magnet hole 51a and the first magnet hole 51b. On the other hand, since the first partition wall portion 37 is provided so as to overlap with the first connection hole portion 57 in the axial direction, compared to the case where the first magnet hole 51a and the first magnet hole 51b are all formed as holes for connection, A decrease in strength of the rotor core 30 can be suppressed. Therefore, while ensuring the strength of the rotor core 30, the leakage of the magnetic flux can be suppressed. Therefore, while suppressing deformation of the rotor core 30 in the magnet hole 50 and the like, it is possible to suppress a decrease in the output of the rotating electric machine 60 .

Further, according to this embodiment, a plurality of magnet holding portions 31 are provided along the circumferential direction. Each of the plurality of plate members 30b includes a first hole portion 53a and a first connection hole portion 57 in one magnet holding portion 31, a second hole portion 53b and a first partition wall portion 37 in another magnet holding portion 31, have That is, the first hole portion 53a, the first connection hole portion 57, the second hole portion 53b, and the first partition wall portion 37 can be provided in one plate member 30b. Therefore, as described above, even if the plurality of plate members 30b all have the same shape, the first connection hole portion 57 and the first partition wall portion 37 can be overlapped in the axial direction by shifting them in the circumferential direction and stacking them. can be done. Thus, the plurality of plate members 30b can all have the same shape, and only one type of plate member 30b can be used. Therefore, one type of punching die can be used when punching out and manufacturing the plate member 30b by press working. Therefore, an increase in manufacturing cost of the plurality of plate members 30b can be suppressed, and an increase in manufacturing cost of the rotor core 30 can be suppressed. Further, for example, when the first connection hole portion 57 is provided in each magnet holding portion 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 wall portion 37 is provided on each of the plate members 30b, strength can be ensured for each of the plate members 30b.

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, the second hole portion 53b and the first partition wall portion The magnet holding portion 31 provided with 37 is located on the opposite side in the radial direction with the central axis J interposed therebetween. That is, in the present embodiment, the first magnet holding portion 31a and the second magnet holding portion 31b are positioned on opposite sides of each other with the central axis J interposed therebetween in the radial direction. Therefore, it is easier to ensure the strength of the plate member 30b than, for example, when the first connection holes 57 are provided in both magnet holding portions 31 on both sides of the central axis J in the radial direction. In addition, compared to the case where the first partition wall portion 37 is provided in each of the magnet holding portions 31 on both sides of the central axis J in the radial direction, the magnetic flux flowing in the radial direction can be suppressed from flowing to the opposite side of the Therefore, leakage of magnetic flux can be further suppressed.

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 second The magnet holding portion 31 provided with the hole portion 53b and the first partition wall portion 37, that is, the second magnet holding portion 31b, is arranged in different regions RE1 and RE2 adjacent to each other in the circumferential direction. , a plurality of each are provided along the circumferential direction. Therefore, in each plate member 30b, portions having different hole shapes can be collectively arranged. This makes it possible to simplify the shape of the punching die for punching and manufacturing the plate member 30b.

Further, according to this embodiment, the plurality of plate members 30b have the same shape. The plate members 30b adjacent to each other in the axial direction are laminated while being displaced from each other in the circumferential direction. Therefore, the rotor core body 30a can be made from one type of plate member 30b. As a result, only one type of punching die can be used for punching and manufacturing the plate member 30b by press working. Therefore, an increase in manufacturing cost of the plurality of plate members 30b can be suppressed, and an increase in manufacturing cost of the rotor core 30 can be suppressed.

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 wall portion 37 is a partition wall portion that separates the radial inner end portions of the pair of first magnet holes 51a and 51b. The first partition wall portion 37 overlaps the first connection hole portion 57 when viewed in the axial direction. Therefore, it is possible to secure the strength of the portion of the rotor core 30 where the pair of first magnet holes 51a and 51b are provided, while suppressing the radial leakage of the magnetic flux from between the pair of first magnet holes 51a and 51b. .

Further, according to the present embodiment, the radial edge portion of the inner edge portion of the first connection hole portion 57 extends linearly when viewed in the axial direction. Therefore, for example, compared to the case where the edge portion located in the radial direction of the inner edge portion of the first connection hole portion 57 extends in a curved shape when viewed in the axial direction, the first connection hole portion 57 can be formed by punching with a punching die. easy to make.

Further, according to the present embodiment, the rotor core body 30a has the crimped portion 36 that fixes the plate members 30b adjacent to each other in the axial direction. The crimped portion 36 is located between the pair of first magnet holes 51a and 51b in the circumferential direction. The circumferential position of the crimped portion 36 includes the circumferential center position of the first partition wall portion 37 . By providing the crimped portion 36 at such a position, it is possible to suppress the influence of the crimped portion 36 on the magnetic flux flowing through the rotor core body 30a. In addition, the crimped portion 36 tends to suppress the flow of the magnetic flux in the radial direction via the first partition wall portion 37 . Moreover, the crimped portion 36 facilitates reinforcement of the portion provided with the first connection hole portion 57 overlapping the first partition wall portion 37 in the axial direction.

Further, 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 wall 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, the circumferential dimension L1 of the first partition wall 37 can be easily reduced, and the magnetic flux flowing through the first partition wall 37 can be more easily reduced. This can further suppress leakage of magnetic flux. In addition, it is relatively easy to increase the circumferential distance L2 between the radially inner ends of the pair of second magnet holes 52a and 52b. Therefore, the strength of the radially inner portion of the rotor core 30 that is fixed to the shaft 20 can be increased, and deformation of the rotor core 30 can be further suppressed.

<Second embodiment>
In the following, the same configurations as in the above-described embodiment 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 this 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 radial inner end portions of the pair of second magnet holes 252a and 252b. The second connection hole portion 258 connects the radial inner end portion of the first hole portion 255a of the second magnet hole 252a and the radial inner end portion of the first hole portion 256a of the second magnet hole 252b. In this embodiment, the second connection hole portion 258 is provided in the magnet holding portion 231 provided with the first connection hole portion 57, that is, the first magnet holding portion 231a, in each plate member 30b.

Of 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, similarly to the first connection hole portion 57 described above, the second connection hole portion 258 can be easily formed by punching with a punching die. The radially outer edge portion of the inner edge portion of the second connection hole portion 258 extends in a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction, and is the radially outer edge portion of the first hole portion 255a. and the radially outer edge of the first hole portion 256a. The radially inner edge portion of the inner edge portion of the second connection hole portion 258 extends in a direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction, and is the radially inner edge portion of the first hole portion 255a. and the radially inner edge of the first hole portion 256a.

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

Other configurations of each part of the rotor core 230 are the same as other configurations of each part of the rotor core 30 of the first embodiment. Other configurations of each part of the rotor 210 are the same as other configurations of each part of the rotor 10 of the first embodiment.

According to this 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 wall portion 238 is a partition wall portion that separates the radial inner end portions of the pair of second magnet holes 252a and 252b. The second partition wall portion 238 overlaps the second connection hole portion 258 when viewed in the axial direction. Therefore, it is possible to secure the strength of the portion of the rotor core 230 where the pair of second magnet holes 252a and 252b are provided, while suppressing the radial leakage of the magnetic flux from between the pair of second magnet holes 252a and 252b. .

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. FIG. That is, the first magnet holding portion 231 a has the first connection hole portion 57 and the second partition wall portion 238 , and the second magnet holding portion 231 b axially connected to the first magnet holding portion 231 a has the second connection hole portion 258 . and a first partition wall portion 37 .

<Third Embodiment>
In the following, the same configurations as in the above-described embodiment 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 252a in the second embodiment. 252b respectively. The first connection hole portion 357 is the same as the second connection hole portion 258 in the second embodiment. The first partition wall portion 337 is the same as the second partition wall portion 238 in the second embodiment.

In this embodiment, only one second magnet hole 352 is provided in each magnet holding portion 331 . The second magnet hole 352 is positioned circumferentially between the radially outer ends of the pair of first magnet holes 351a and 351b. The second magnet hole 352 extends in the cross direction crossing the radial direction when viewed in the axial direction. In this embodiment, the intersecting direction in which the second magnet hole 352 extends when viewed in the axial direction is the direction orthogonal to the magnetic pole center line Ld when viewed in the axial direction.

A pair of first magnets 341a and 341b respectively arranged in a 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 arranged 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 this 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 the magnets 40 of the first embodiment.

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

Other configurations of each part of the rotor core 330 are the same as other configurations 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 other configurations of each part of the rotor 10 of the first embodiment.

<Fourth Embodiment>
In the following, the same configurations as in the above-described embodiment 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, a pair of first magnet holes 451a and 451b provided in the magnet holding portion 431 are connected to the rotor core by fourth connection hole portions 459a and 459b described later, respectively. They are the same as the pair of second magnet holes 52a and 52b of the first embodiment except that they are connected to the radially outer side surface 430s of the main body 430a.

The magnet holding portion 431 is provided with a pair of second magnet holes 452a and 452b. The pair of second magnet holes 452a and 452b are positioned circumferentially between 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 the cross direction crossing the radial direction when viewed in the axial direction. In this embodiment, the intersecting direction in which the second magnet holes 452a and 452b extend when viewed in the axial direction is the 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 arranged side by side in the crossing direction.

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 is connected to the second magnet hole 452b side end of the first hole portion 455a of the second magnet hole 452a and the second magnet hole 452a side end of the first hole portion 456a of the second magnet hole 452b. It connects with the department. 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 radially. 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.

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

The magnet holding portion 431 has fourth connection holes 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 radial 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 radial outer surface 430s of the rotor core body 430a. The first magnet holes 451a and 451b open to the radially outer side surface 430s via fourth connection hole portions 459a and 459b. In this embodiment, the fourth connection holes 459a and 459b are provided in the magnet holding portion 431 provided with the third connection hole 458, ie, the first magnet holding portion 431a, in each plate member 30b.

The magnet holding portion 431 has fourth partition portions 439a and 439b. The fourth partition wall portion 439a is a partition wall portion that separates the radial outer surface 430s of the rotor core body 430a and the second hole portion 453b of the first magnet hole 451a. The fourth partition wall portion 439b is a partition wall portion that separates the radial outer surface 430s of the rotor core body 430a and the second hole portion 454b of the first magnet hole 451b. The fourth partitions 439a and 439b extend in the circumferential direction. The radially outer side surfaces of the fourth partition walls 439a and 439b form part of the radially outer side surface 430s of the rotor core body 430a. The fourth partition wall portion 439a overlaps the fourth connection hole portion 459a when viewed in the axial direction. The fourth partition wall portion 439b overlaps the fourth connection hole portion 459b when viewed in the axial direction. In this embodiment, the fourth partitions 439a and 439b are provided in the magnet holding portion 431 where the third partition 438 is provided, that is, the second magnet holding portion 431b in each plate member 30b.

A pair of first magnets 441a and 441b respectively arranged in a pair of first magnet holes 451a and 451b are the same as the pair of second magnets 42a and 42b in the first and second embodiments, respectively. The pair of second magnets 442a, 442b respectively arranged in the pair of second magnet holes 452a, 452b extends in the tolerance direction in which the second magnet holes 452a, 452b extend, respectively, when viewed in the axial direction. In this embodiment, each of the pair of second magnets 442a and 442b extends in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction. The pair of second magnets 442a and 442b are arranged line-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 the magnets 40 of the first embodiment.

Other configurations of each part of rotor core 430 are the same as other configurations of each part of rotor core 330 of 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 of the third embodiment.

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 438 is a partition that separates the pair of second magnet holes 452a and 452b. The third partition wall portion 438 overlaps the third connection hole portion 458 when viewed in the axial direction. Therefore, it is possible to secure the strength of the portion of the rotor core 430 where the pair of second magnet holes 452a and 452b are provided, while suppressing the radial leakage of the magnetic flux from between the pair of second magnet holes 452a and 452b. .

Further, according to the present embodiment, the fourth connection hole portion 459a is a connection hole portion that connects the first hole portion 453a and the radial outer surface 430s of the rotor core body 430a. The fourth partition wall portion 439a is a partition wall portion that separates the radial outer surface 430s of the rotor core body 430a from the second hole portion 453b. The fourth partition wall portion 439a overlaps the fourth connection hole portion 459a when viewed in the axial direction. Therefore, it is possible to secure the strength of the portion of the rotor core 430 where the first magnet hole 451a is provided while suppressing leakage of magnetic flux in the circumferential direction from between the first magnet hole 451a and the radial outer surface 430s. This effect is similarly obtained by the fourth connection hole portion 459b and the fourth partition wall portion 439b.

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 member 30b provided with the fourth connection hole portions 459a and 459b. That is, the first magnet holding portion 431a has a third connection hole portion 458 and fourth partition wall portions 439a and 439b, and the second magnet holding portion 431b axially connected to the first magnet holding portion 431a has a fourth connection hole. It may have portions 459 a and 459 b and a third partition portion 438 . Further, 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 has a fourth connection hole portion 459a and a fourth partition wall portion 439b, and the second magnet holding portion 431b axially connected to the first magnet holding portion 431a has a fourth connection hole portion 459b. and a fourth partition wall portion 439a.

The present invention is not limited to the above-described embodiments, and other configurations and methods can be adopted within the scope of the technical idea of the present invention. At least one magnet hole having the first hole and the second hole may be provided in the plurality of magnet holes. At least one of the connection hole and the partition wall should overlap each other when viewed in the axial direction. When a plurality of connection holes and partition walls are provided, the plurality of connection holes and partition walls may be arranged in any way along the axial direction. The connection holes and the partition walls may be arranged alternately one by one along the axial direction. If the connection hole connects the first hole and either a magnet hole different from the magnet hole in which the first hole is provided or a portion of the radial outer surface of the rotor core body, any It may be provided as follows. Only one of the connection holes in each of the above-described embodiments may be provided, or any two or more of the connection holes in each of the above-described embodiments may be provided. good too.

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. A connection hole portion other than the portion, the second connection hole portion, the third connection hole portion, and the fourth connection hole portion may be included. The partition may include any one or more of the first partition, the second partition, the third partition, and the fourth partition, or the first partition, the second partition, Partitions other than the third partition and the fourth partition may be included. For example, in the above-described third embodiment, 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, or one of the first magnet hole 351a and the first magnet hole 351b A connection hole may be provided for connecting the The shape of the connection hole and the shape of the partition are not particularly limited.

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

The pair of protrusions may be provided on the inner side surface of the first hole. In this case, the pair of protrusions may be provided on the inner side surface of the second hole, or the pair of protrusions may not be provided on the inner side surface of the second hole.

When the plate members adjacent to each other in the axial direction are laminated while being displaced from each other in the circumferential direction, the circumferential angle θ at which the plate members are displaced from each other is not particularly limited. The angle θ at which the axially adjacent plate members are displaced in the circumferential direction may be, for example, 45° or 180°. The plurality of plate members forming the rotor core body may include two or more types of plate members having different shapes. The caulked portion that fixes the plate members to each other may be provided at any position. The plate members may be fixed to each other by means other than the crimped portion. In each plate member, the magnet holder provided with the first hole and the connection hole and the magnet holder provided with the second hole and the partition may be arranged in any way. The plurality of plate members may include a plate member provided with the first hole and the connection hole and not provided with the second hole and the partition, or provided with the second hole and the partition, Also, a plate member having no first hole and no connection hole may be included.

A rotating electric machine to which the present invention is applied is not limited to a motor, and may be a generator. Applications of the rotating electric machine are not particularly limited. The rotating electric machine may be mounted on equipment other than a vehicle. Applications of the driving device to which the present invention is applied are not particularly limited. For example, the driving device may be mounted on a vehicle for purposes other than the use of rotating the axle, or may be mounted on equipment other than the vehicle. There is no particular limitation on the orientation of the rotating electric machine and the driving device when they are used. The central axis of the rotating electric machine may be inclined with respect to a horizontal direction perpendicular to the vertical direction, or may extend in the vertical direction. The configurations described above in this specification can be appropriately combined within a mutually consistent range.

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... Protrusions 36... Crimped parts 37, 337... First partitions (partitions) 40... Magnets 41a, 41b, 341a, 341b, 441a, 441b... First magnets (magnets), 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 holes 53a, 54a, 55a, 56a, 255a, 256a, 453a, 454a, 455a, 456a... first holes 53b, 54b, 55b, 56b, 255b, 256b, 453b, 454b , 455b, 456b... Second hole 57, 357... First connection hole (connection hole) 60... Rotary electric machine 61... Stator 70... Gear mechanism 100... Drive device 238... Second partition (Partition wall portion) 258 . ... third connection hole portion (connection hole portion), 459a, 459b... fourth connection hole portion (connection hole portion), J... central axis, RE1, RE2... area

Claims (17)

A rotor core of a rotor rotatable about a central axis,
A rotor core body configured by stacking a plurality of plate members in an 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 extends in a direction away from each other in the circumferential direction as viewed in the axial direction from the radially inner side toward the radially outer side,
At least one magnet hole of the plurality of magnet holes,
a first hole provided in at least one of the plurality of plate members;
a second hole provided in at least one plate member different from the plate member provided with the first hole and axially connected to the first hole;
has
The magnet holding part is
a connection hole provided in the plate member provided with the first hole;
a partition provided in the plate member provided with the second hole;
has
The connection hole portion includes the first hole portion and either a 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. connect,
The rotor core, wherein the partition separates the one portion and the second hole and overlaps the connection hole when viewed in the axial direction. A plurality of the magnet holding portions are provided along the circumferential direction,
Each of the plurality of plate members has the first hole and the connection hole in one magnet holding portion, and the second hole and the partition wall in another magnet holding portion. Item 1. The rotor core according to item 1. In each of the plurality of plate members, the magnet holding portion provided with the first hole and the connection hole and the magnet holding portion provided with the second hole and the partition are 3. The rotor core according to claim 2, wherein the rotor cores are positioned diametrically opposite to each other across the central axis. In each of the plurality of plate members, 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 wall portion 4. The rotor core according to claim 2, wherein the rotor core is arranged in different regions adjacent to each other in the direction, and a plurality of the rotor cores are provided along the circumferential direction in each region. the plurality of plate members have the same shape,
5. The rotor core according to any one of claims 2 to 4, wherein said plate members adjacent in the axial direction are laminated with being shifted from each other in the circumferential direction. the connection hole portion includes a first connection hole portion connecting radially inner ends of the pair of first magnet holes,
The partition includes a first partition that separates the radially inner ends of the pair of first magnet holes,
The rotor core according to any one of claims 1 to 5, wherein the first partition wall overlaps the first connection hole when viewed in the axial direction. 7. The rotor core according to claim 6, wherein a radial edge portion of the inner edge portion of the first connection hole portion extends linearly when viewed in the axial direction. The rotor core body has a crimped portion for fixing the plate members adjacent to each other in the axial direction,
The crimped portion is positioned between the pair of first magnet holes in the circumferential direction,
8. The rotor core according to claim 6, wherein the circumferential position of the crimped portion includes the circumferential center position of the first partition wall portion. 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 positioned radially inward of the pair of first magnet holes, and extend in directions away from each other in the circumferential direction as viewed in the axial direction from the radially inner side to the radially outer side. ,
the radially inner ends of the pair of second magnet holes are spaced apart in the circumferential direction,
9. Any one of claims 6 to 8, wherein the minimum value of the circumferential dimension of the first partition is smaller than the minimum value of the circumferential distance between the radially inner ends of the pair of second magnet holes. or the rotor core according to claim 1. 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 positioned radially inward of the pair of first magnet holes, and extend in directions away from each other in the circumferential direction as viewed in the axial direction from the radially inner side to the radially outer side. 9. A rotor core according to any one of claims 1 to 8, wherein the rotor core is the connection hole portion includes a second connection hole portion connecting radially inner ends of the pair of second magnet holes,
The partition includes a second partition that separates the radially inner ends of the pair of second magnet holes,
11. The rotor core according to claim 9, wherein the second partition wall overlaps the second connection hole when viewed in the axial direction. The second magnet hole is positioned between the radial outer ends of the pair of first magnet holes in the circumferential direction, and extends in a cross direction crossing the radial direction when viewed in the axial direction. A rotor core according to any one of claims 1 to 8. A pair of the second magnet holes are provided side by side in the cross direction,
The connection hole includes a third connection hole that connects the pair of second magnet holes,
the partition includes a third partition that separates the pair of second magnet holes,
13. The rotor core according to claim 12, wherein the third partition wall overlaps the third connection hole when viewed in the axial direction. the connection hole portion includes a fourth connection hole portion connecting the first hole portion and a radially outer surface of the rotor core body;
The partition includes a fourth partition that separates the radial outer surface of the rotor core body and the second hole,
The rotor core according to any one of claims 1 to 13, wherein the fourth partition wall overlaps the fourth connection hole when viewed in the axial direction. 15. The magnet according to any one of claims 1 to 14, wherein at least one of the inner surface of the first hole and the second hole is provided with a pair of protrusions sandwiching a magnet arranged in the magnet hole. 11. A rotor core as described in Clause 1. A rotor having the rotor core according to any one of claims 1 to 15 and a plurality of magnets respectively arranged in the plurality of magnet holes;
a stator facing the rotor with a gap therebetween;
A rotating electric machine. a rotating electrical machine according to claim 16;
a gear mechanism connected to the rotating electric machine;
A drive device.

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