Rotor core, rotary electric machine, and drive device

Abstract

A rotor core includes a rotor core main body composed of a plurality of plate members. A magnet hole of a magnet holding portion of the rotor core main body includes a pair of first magnet holes adjacent in a circumferential direction and a second magnet hole different from the pair of first magnet holes. At least one of the magnet holes has a first hole portion provided to at least one of the plurality of plate members and a second hole portion provided to at least one plate member different from the plate member provided with the first hole portion and connected to the first hole portion in an axial direction. The magnet holding portion has a connection hole portion provided to the plate member provided with the first hole portion and a partition wall portion provided to the plate member provided with the second hole portion. The connection hole portion connects the first hole portion to a portion of either another magnet hole different from the magnet hole provided with the first hole portion or a radially outer side surface of the rotor core main body. The partition wall portion separates the portion of either from the second hole portion and overlaps the connection hole portion when viewed in the axial direction.

Description

Technical Field

[0001] This invention relates to a rotor core, a rotary motor, and a drive device. Background Technology

[0002] A rotary electric motor is known, comprising a rotor core having a pair of magnet insertion holes in an approximately V-shape. For example, as such a rotary electric motor, Patent Document 1 describes a rotary electric motor in which a bridging portion separating the pair of magnet insertion holes is provided in the rotor core.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2019-161750. Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In rotor cores like the one described above, sometimes, for example, magnetic flux leakage from the bridging section to the radially inward side can cause a decrease in the output of the rotating motor. On the other hand, if the bridging section is made thinner or the magnet insertion holes are connected to each other without a bridging section, magnetic flux leakage to the radially inward side can be suppressed, thus suppressing the decrease in the output of the rotating motor. However, in this case, problems such as reduced rotor core strength and deformation of the magnet insertion holes may sometimes occur.

[0008] Based on the above, one of the objectives of the present invention is to provide a rotor core, a rotary motor, and a drive device, wherein the rotor core has a structure that ensures strength and suppresses magnetic flux leakage, the rotary motor includes such a rotor core, and the drive device includes such a rotary motor.

[0009] Technical solutions adopted to solve technical problems

[0010] One embodiment of the rotor core of the present invention is a rotor core capable of rotating about a central axis, comprising a rotor core body formed by stacking a plurality of plate members axially. The rotor core body has a magnet holding portion 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. The pair of first magnet holes extends in a direction that separates from each other circumferentially as viewed axially. At least one of the plurality of magnet holes has: a first hole portion disposed on at least one of the plurality of plate members; and a second hole portion disposed on at least one plate member different from the plate member with the first hole portion, and axially connected to the first hole portion. The magnet holding portion has: a connecting hole portion disposed on the plate member with the first hole portion; and a partition wall portion disposed on the plate member with the second hole portion. The connecting hole connects the first hole to a portion of either another magnet hole (different from the magnet hole with the first hole) or a portion of the radially outer surface of the rotor core body. The partition wall separates the portion of the first magnet hole from the second hole and overlaps with the connecting hole when viewed axially.

[0011] One embodiment of the rotary electric motor of the present invention includes: a rotor having the rotor core and a plurality of magnets respectively disposed in the plurality of magnet holes; and a stator facing the rotor with a gap between them.

[0012] One embodiment of the drive device of the present invention includes the rotary motor and a gear mechanism connected to the rotary motor.

[0013] Invention Effects

[0014] According to one aspect of the present invention, the strength of the rotor core can be ensured in the rotating electric motor and the drive device, and magnetic flux leakage can be suppressed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the drive device of the first embodiment.

[0016] Figure 2 This is a cross-sectional view showing the rotor of the first embodiment.

[0017] Figure 3 This is a perspective view showing a portion of the rotor core according to the first embodiment.

[0018] Figure 4This is a cross-sectional view showing a portion of the rotor of the first embodiment, and a cross-sectional view showing a portion of a plate member and a portion of a magnet.

[0019] Figure 5 This is a cross-sectional view showing a portion of the rotor of the first embodiment, and a cross-sectional view showing a portion of another plate member and a portion of the magnet.

[0020] Figure 6 This is a diagram showing a plate member of the first embodiment viewed axially.

[0021] Figure 7 This is a diagram showing another plate component of the first embodiment viewed axially.

[0022] Figure 8 This is a cross-sectional view showing a portion of the rotor in the second embodiment.

[0023] Figure 9 This is a cross-sectional view showing a portion of the rotor in the third embodiment.

[0024] Figure 10 This is a cross-sectional view showing a portion of the rotor according to the fourth embodiment. Detailed Implementation

[0025] In the following description, the vertical direction is defined based on the positional relationship of the drive unit in the embodiment mounted on a vehicle located on a horizontal road surface. That is, when the drive unit is mounted on a vehicle located on a horizontal road surface, it is sufficient to satisfy at least the relative positional relationship with respect to the vertical direction described in the following embodiment.

[0026] In the accompanying drawings, the XYZ coordinate system is appropriately represented as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper vertical direction, and the -Z side is the lower vertical direction. In the following description, the upper vertical direction is simply referred to as the "upper side," and the lower vertical direction is simply referred to as the "lower side." The X-axis direction is the direction orthogonal to the Z-axis direction, and it is the front-rear direction of the vehicle on which the drive unit 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 the direction orthogonal to both the X-axis and Z-axis directions, and it is the left-right direction of the vehicle, i.e., 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 and left-right directions are horizontal directions orthogonal to the vertical direction.

[0027] Furthermore, the front-to-back positional relationship is not limited to the positional relationship described in the following embodiment. It can also be that the +X side is the rear side of the vehicle and the -X side is 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. In addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "orthogonal direction" also includes a substantially orthogonal direction.

[0028] The central axis J, appropriately represented in the diagram, is an imaginary axis extending along a direction intersecting the vertical direction. More specifically, the central axis J1 extends along the Y-axis direction, which is orthogonal to the vertical direction, i.e., the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J will be simply referred to as "axial direction," the radial direction centered on the central axis J will be simply referred to as "radial direction," and the circumferential direction centered on the central axis J, i.e., the direction around the central axis J, will be simply referred to as "circumferential direction."

[0029] <First Implementation>

[0030] Figure 1 The drive unit 100 shown in this embodiment is a drive unit installed in a vehicle and that rotates the axle 73. Vehicles equipped with the drive unit 100 are hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHVs), and electric vehicles (EVs), which use an electric motor as their power source. Figure 1 As shown, the drive device 100 includes a rotary motor 60, a gear mechanism 70 connected to the rotary motor 60, a housing 80 that houses the rotary motor 60 and the gear mechanism 60, and a control device 64 that controls the rotary motor 60. In this embodiment, the rotary motor 60 is a motor.

[0031] The housing 80 houses the rotary motor 60 and the gear mechanism 70 internally. The housing 80 has a motor housing 81 that houses the rotary motor 60 internally, and a gear housing 82 that houses the gear mechanism 70 internally. In this embodiment, oil is housed inside the motor housing 81 and the gear housing 82.

[0032] The gear mechanism 70 transmits the rotation of the rotary motor 60 to the vehicle axle 73. The gear mechanism 70 has a reduction gear 71 connected to the rotary motor 60 and a differential gear 72 connected to the reduction gear 71. The differential gear 72 is connected to the axle 73.

[0033] The rotary electric motor 60 includes: a rotor 10, which is rotatable about a central axis J; and a stator 61, which is positioned opposite the rotor 10 with a gap. In this embodiment, the stator 61 is located radially outward of the rotor 10. The stator 61 has a stator core 62 and a plurality of coils 63 mounted on the stator core 62.

[0034] like Figure 2 As shown, the rotor 10 has a shaft 20, a rotor core 30, and multiple magnets 40. Figure 1 As shown, shaft 20 extends axially around the central axis J. The left (+Y side) end of shaft 20 protrudes into the gear housing 82.

[0035] The rotor core 30 is fixed to the outer circumferential surface of the shaft 20. For example... Figure 2 As shown, the rotor core 30 is cylindrical with its central axis J as the center. The rotor core 30 has a central hole 30h that extends axially through the rotor core 30. The central hole 30h is a circular hole centered on the central axis J. The shaft 20 passes through the central hole 30h axially. The inner circumferential surface of the central hole 30h is fixed to the outer circumferential surface of the shaft 20.

[0036] The rotor core 30 includes a rotor core body 30a. In this embodiment, the rotor core 30 is composed only of the rotor core body 30a. The rotor core body 30a is magnetic. Figure 3 As shown, the rotor core body 30a is composed of multiple plate members 30b stacked axially. Each plate member 30b is a plate-shaped member with its surface facing axially. Each plate member 30b is a circular plate centered on the central axis J. For example, the plate member 30b is an electromagnetic steel plate.

[0037] like Figure 2 As shown, the rotor core body 30a has a magnet holding portion 31, which has a plurality of magnet holes 50. The magnet holding portion 31 is disposed on the radially outer portion of the rotor core body 30a. In this embodiment, a plurality of magnet holding portions 31 are provided circumferentially. The plurality of magnet holding portions 31 are arranged at equal intervals throughout the circumference. In this embodiment, eight magnet holding portions 31 are provided.

[0038] In this embodiment, multiple magnet holes 50 penetrate the rotor core body 30a axially. For example... Figure 4 and Figure 5 As shown, at each magnet holding portion 31, the plurality of magnet holes 50 include a pair of first magnet holes 51a and 51b that are circumferentially adjacent to each other, and a second magnet hole 52 that is 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 that are circumferentially adjacent. That is, in each magnet holding portion 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.

[0039] Each of the plurality of magnet holes 50 is respectively disposed with a magnet 40. 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 may be, for example, a cuboid shape that is longer in the axial direction. The magnet 40 may extend, for example, from one end of the rotor core 30 in the axial direction to the other end in the axial direction.

[0040] The plurality of magnets 40 includes a pair of first magnets 41a and 41b respectively disposed within a pair of first magnet holes 51a and 51b, and a pair of second magnets 42a and 42b respectively disposed within a pair of second magnet holes 52a and 52b. For example Figure 2 As shown, resin 90 is disposed on the portion of each magnet hole 50 other than the portion where the magnet 40 is disposed. In this embodiment, each magnet 40 is fixed in each magnet hole 50 by the resin 90. Furthermore, in Figure 2 In other figures, the resin 90 is omitted. Furthermore, the method of fixing each magnet 40 to each magnet hole 50 is not particularly limited. For example, each magnet 40 may also be fixed to each magnet hole 50 by riveting a portion of the rotor core 30.

[0041] like Figure 2 As shown, the magnetic pole section 10P is composed of a magnet holding section 31 and a plurality of magnets 40 disposed within a plurality of magnet holes 50 provided in the magnet holding section 31. A plurality of magnetic pole sections 10P are arranged at equal intervals along the circumference. In this embodiment, eight magnetic pole sections 10P are provided. Each of the plurality of magnetic pole sections 10P includes a plurality of magnetic pole sections 10N and a plurality of magnetic pole sections 10S. The magnetic pole of magnetic pole section 10N at the outer peripheral surface of the rotor core 30 is the N pole, and the magnetic pole of magnetic pole section 10S at the outer peripheral surface of the rotor core 30 is the S pole. In this embodiment, four magnetic pole sections 10N and four magnetic pole sections 10S are provided. The four magnetic pole sections 10N and four magnetic pole sections 10S are arranged alternately along the circumference. The structures of each magnetic pole section 10P are identical except for the difference in the magnetic pole at the outer peripheral surface of the rotor core 30 and the difference in the circumferential position.

[0042] like Figure 4 and Figure 5 As shown, in the magnetic pole section 10P, the first magnet holes 51a and 51b are arranged to sandwich the magnetic pole center line Ld in the circumferential direction. The magnetic pole center line Ld is an imaginary line that passes through the circumferential center and the central axis J of the magnetic pole section 10P and extends radially. The magnetic pole center line Ld is provided in each magnetic pole section 10P. When viewed axially, the magnetic pole center line Ld passes through the d-axis of the rotor 10. The direction in which the magnetic pole center line Ld extends is the d-axis direction of the rotor 10. The first magnet holes 51a and 51b are arranged symmetrically with respect to the magnetic pole center line Ld when viewed axially.

[0043] When viewed axially, the pair of first magnet holes 51a and 51b extend in a direction in which they separate circumferentially from each other from the radially inward side to the radially outward side. That is, the circumferential distance between the first magnet holes 51a and 51b increases from the radially inward side to the radially outward side. When viewed axially, the pair of first magnet holes 51a and 51b are arranged in a V-shape that expands circumferentially towards the radially outward side. The pair of first magnets 41a and 41b disposed in the pair of first magnet holes 51a and 51b are arranged in a V-shape that expands circumferentially towards the radially outward side when viewed axially.

[0044] A pair of second magnet holes 52a and 52b are located radially inside a pair of first magnet holes 51a and 51b. Second magnet hole 52a is located radially inside first magnet hole 51a. Second magnet hole 52b is located radially inside first magnet hole 51b. The pair of second magnet holes 52a and 52b are configured to circumferentially sandwich a pair of first magnet holes 51a and 51b. In the magnetic pole portion 10P, the second magnet holes 52a and 52b are configured circumferentially sandwiching the magnetic pole center line Ld. The second magnet holes 51a and 52b are configured to be symmetrical with respect to the magnetic pole center line Ld when viewed axially.

[0045] A pair of second magnet holes 52a and 52b extend in the direction of circumferential separation from each other when viewed axially. That is, the circumferential distance between the second magnet holes 51a and 52b increases from the radially inward side to the radially outward side. In this embodiment, the radially inner ends of the pair of second magnet holes 52a and 52b are arranged circumferentially separated from each other. A bridging portion 37a is provided between the radially inner ends of the pair of second magnet holes 52a and 52b.

[0046] The bridging portion 37a extends radially. The bridging portion 37a is an approximately rectangular shape that is radially longer when viewed axially. The circumferential center position of the bridging portion 37a is, for example, the same as the circumferential position of the magnetic pole centerline Ld. The circumferential dimension of the radially outer end of the bridging portion 37a increases radially outward. The circumferential dimension of the radially inner end of the bridging portion 37a increases radially inward.

[0047] The pair of second magnet holes 52a and 52b are arranged in a V-shape that expands circumferentially outward when viewed axially. The pair of second magnets 42a and 42b disposed in the pair of second magnet holes 52a and 52b are also arranged in a V-shape that expands circumferentially outward when viewed axially. In other words, in each magnetic pole portion 10P of this embodiment, two pairs of magnets 40 arranged in a V-shape when viewed axially are arranged radially. By arranging the four magnets 40 in the above-described configuration in each magnetic pole portion 10P, magnetic flux can flow better between the rotor 10 and the stator 61. This allows for a better output from the rotary motor 60.

[0048] The first magnet hole 51a and the second magnet hole 52a extend parallel to each other when viewed axially. The first magnet hole 51b and the second magnet hole 52b extend parallel to each other when viewed axially. The first magnet hole 41a and the second magnet hole 42a extend parallel to each other when viewed axially. The first magnet hole 41b and the second magnet hole 42b extend parallel to each other when viewed axially.

[0049] In each magnet hole 50, each magnet 40 is arranged so that, when viewed axially, it is located away from both ends of the direction in which the magnet hole 50 extends. Therefore, in the direction in which each magnet 40 extends when viewed axially, a magnetic isolation bridge portion 50f is provided on both sides of each magnet 40. In this embodiment, each magnetic isolation bridge portion 50f is constructed such that a portion of the magnet hole 50 is filled with resin 90.

[0050] Furthermore, in this specification, "the direction in which the magnet extends when viewed along the axial direction" refers, for example, the direction in which the long side of the rectangular magnet extends when viewed along the axial direction, as in the case where the magnets 41a and 41b of this embodiment are rectangular in shape. That is, for example, in this embodiment, "the direction in which the magnet 41a extends when viewed along the axial direction" refers to the direction in which the long side of the rectangular first magnet 41a extends when viewed along the axial direction.

[0051] Furthermore, in this specification, "magnetic bridge section" refers to a portion capable of suppressing the flow of magnetic flux. In other words, magnetic flux cannot easily pass through each magnetic bridge section. There are no particular limitations on each magnetic bridge section as long as it can suppress the flow of magnetic flux; it may include gaps or non-magnetic portions other than resin.

[0052] In each magnet hole 50 of this embodiment, each magnet 40 is in contact with the radially outer surface of the inner side of each magnet hole 50, which is located in a direction orthogonal to the extending direction of each magnet hole 50 when viewed axially. A recess 50e is provided on the radially inner surface of the inner side of each magnet hole 50, which is located in a direction orthogonal to the extending direction of each magnet hole 50 when viewed axially. Resin 90 is filled in the recess 50e. Because of the recess 50e, the resin 90 can be firmly held within the magnet hole 50. Therefore, the magnet 40 can be firmly fixed within the magnet hole 50 using the resin 90.

[0053] like Figure 3 As shown, the first magnet hole 51a has a first hole portion 53a and a second hole portion 53b, wherein the first hole portion 53a is provided on at least one of a plurality of plate members 30b, and the second hole portion 53b is provided on at least one plate member 30b different from the plate member 30b provided with the first hole portion 53a. The second hole portion 53b is axially connected to the first hole portion 53a. In this embodiment, the first magnet hole 51a is constructed by axially connecting a plurality of first hole portions 53a and a plurality of second hole portions 53b. For example, the first hole portions 53a and the second hole portions 53b are provided alternately in pairs along the axial direction.

[0054] The first magnet hole 51b has a first hole portion 54a and a second hole portion 54b, wherein the first hole portion 54a is provided on at least one of a plurality of plate members 30b, and the second hole portion 54b is provided on at least one plate member 30b different from the plate member 30b provided with the first hole portion 54a. The second hole portion 54b is axially connected to the first hole portion 54a. In this embodiment, the first magnet hole 51b is constructed by axially connecting a plurality of first hole portions 54a and a plurality of second hole portions 54b. For example, the first hole portions 54a and the second hole portions 54b are provided alternately in pairs along the axial direction.

[0055] The second magnet hole 52a has a first hole portion 55a and a second hole portion 55b, wherein the first hole portion 55a is provided on at least one of a plurality of plate members 30b, and the second hole portion 55b is provided on at least one plate member 30b different from the plate member 30b provided with the first hole portion 55a. The second hole portion 55b is axially connected to the first hole portion 55a. In this embodiment, the second magnet hole 52a is constructed by axially connecting a plurality of first hole portions 55a and a plurality of second hole portions 55b. For example, the first hole portions 55a and the second hole portions 55b are provided alternately in pairs along the axial direction.

[0056] The second magnet hole 52b has a first hole portion 56a and a second hole portion 56b, wherein the first hole portion 56a is provided on at least one of a plurality of plate members 30b, and the second hole portion 56b is provided on at least one plate member 30b different from the plate member 30b provided with the first hole portion 56a. The second hole portion 56b is axially connected to the first hole portion 56a. In this embodiment, the second magnet hole 52b is constructed by axially connecting a plurality of first hole portions 56a and a plurality of second hole portions 56b. The first hole portions 56a and the second hole portions 56b are provided, for example, alternately in pairs along the axial direction.

[0057] like Figure 5 As shown, in this embodiment, a pair of protrusions 32a are provided on the inner side of the second hole 53b, which clamp the first magnet 41a disposed in the first magnet hole 51a. When viewed axially, the pair of protrusions 32a clamp the first magnet 41a in the direction in which the first magnet hole 51a and the first magnet 41a extend. In this embodiment, when viewed axially, the pair of protrusions 32a protrude radially outward from their radially inner side in a direction orthogonal to the direction in which the first magnet hole 51a extends. Figure 4 As shown, no pair of protrusions 32a are provided on the inner side of the first hole 53a.

[0058] like Figure 3 As shown, a pair of protrusions 32 are formed by a pair of protrusions 32a among a plurality of second holes 53b that overlap in the axial direction. The protrusions 32 extend in the axial direction. Each protrusion 32 is formed by a plurality of protrusions 32a arranged axially. In this embodiment, the protrusions 32 are formed by providing a plurality of protrusions 32a that overlap in the axial direction at axial intervals. Although not shown in the figure, resin 90 is disposed in the gap between two protrusions 32a and two other axially adjacent protrusions 32a. The pair of protrusions 32 clamp the first magnet 41a disposed in the first magnet hole 51a.

[0059] like Figure 5As shown, a pair of protrusions 33a are provided on the inner side of the second hole 54b, which clamp the first magnet 41b disposed in the first magnet hole 51b. A pair of protrusions 34a are provided on the inner side of the second hole 55b, which clamp the second magnet 42a disposed in the second magnet hole 52a. A pair of protrusions 35a are provided on the inner side of the second hole 56b, which clamp the second magnet 42b disposed in the second magnet hole 52b. Except for being located on the inner side of the first magnet hole 51b, the pair of protrusions 33a and the pair of protrusions 32a are the same. Except for being located on the inner side of the second magnet hole 52a, the pair of protrusions 34a and the pair of protrusions 32a are the same. Except for being located on the inner side of the second magnet hole 52b, the pair of protrusions 35a and the pair of protrusions 32a are the same. Figure 4 As shown, there is no pair of protrusions on the inner surfaces of the first holes 54a, 55a, and 56a.

[0060] like Figure 3 As shown, a pair of protrusions 33 are formed by a pair of protrusions 33a among a plurality of second holes 54b that overlap in the axial direction. A pair of protrusions 34 are formed by a pair of protrusions 34a among a plurality of second holes 55b that overlap in the axial direction. A pair of protrusions 35 are formed by a pair of protrusions 35a among a plurality of second holes 56b that overlap in the axial direction. Except for the different magnet holes 50, each of the protrusions 33, 34, and 35 is the same as the protrusion 32.

[0061] As described above, by providing a pair of protrusions 32a, 33a, 34a, and 35a on the inner surface of each hole, the position of each magnet 40 can be determined to a certain extent by the pair of protrusions 32a, 33a, 34a, and 35a. Therefore, each magnet 40 can be better positioned within each magnet hole 50.

[0062] like Figure 4 As shown, the magnet holding part 31 has a first connecting hole part 57. The first connecting hole part 57 is provided on the plate member 30b provided with first holes 53a and 54a. The first connecting hole part 57 is a connecting hole part that connects the radially inner ends of a pair of first magnet holes 51a and 51b to each other. The first connecting hole part 57 connects the radially inner end of the first hole 53a to the radially inner end of the first hole 54a. That is, the first connecting hole part 57 connects the first hole 53a to the first hole 53b, and the first hole 53b is another magnet hole 50 different from the first magnet hole 51a provided with the first hole 53a. In addition, the first connecting hole part 57 connects the first hole 54a to the first magnet hole 51a, and the first magnet hole 51a is another magnet hole 50 different from the first magnet hole 51b provided with the first hole 54a.

[0063] In this embodiment, the radially located edge of the inner edge of the first connecting hole portion 57 extends in a straight line when viewed axially. The radially outer edge of the inner edge of the first connecting hole portion 57 extends in a direction orthogonal to the magnetic pole center line Ld when viewed axially, connecting the radially outer edge of the first hole portion 53a to the radially outer edge of the first hole portion 54a. The radially inner edge of the inner edge of the first connecting hole portion 57 extends in a direction orthogonal to the magnetic pole center line Ld when viewed axially, connecting the radially inner edge of the first hole portion 53a to the radially inner edge of the first hole portion 54a.

[0064] like Figure 5 As shown, the magnet holding part 31 has a first partition wall part 37. The first partition wall part 37 is part of the plate member 30b. The first partition wall part 37 is provided on the plate member 30b which is provided with second holes 53b and 54b. The first partition wall part 37 is a partition wall part that separates the radially inner ends of a pair of first magnet holes 51a and 51b from each other. In this embodiment, the first partition wall part 37 separates the radially inner ends of the second hole portion 53b of the first magnet hole 51a from the radially inner ends of the second hole portion 54b of the first magnet hole 51b in the circumferential direction. That is, the first partition wall part 37 separates the first magnet hole 51a from the second hole portion 54b. In addition, the first partition wall part 37 separates the first magnet hole 51b from the second hole portion 53b.

[0065] The first partition wall portion 37 extends radially. The first partition wall portion 37 is an approximately rectangular shape that is radially longer when viewed axially. The circumferential center position of the first partition wall portion 37 coincides with the circumferential position of the magnetic pole centerline Ld. The circumferential dimension of the radially outer end of the first partition wall portion 37 increases radially outward. The circumferential dimension of the radially inner end 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 less than the minimum value of the circumferential distance L2 between the radially inner ends of the pair of second magnet holes 52a, 52b. In this embodiment, the minimum value of the circumferential dimension L1 of the first partition wall portion 37 refers to the value of the circumferential dimension of the first partition wall portion 37 excluding the radially end portions. In this embodiment, the minimum value of the circumferential distance L2 between the radially inner ends of the pair of second magnet holes 52a, 52b refers to the value of the circumferential dimension of the bridging portion 37a excluding the radially end portions.

[0066] like Figure 3 and Figure 4 As shown, the first partition wall portion 37 overlaps with the first connecting hole portion 57 when viewed axially. Figure 3As shown, in this embodiment, the first partition wall portion 37 and the first connecting hole portion 57 are arranged alternately in pairs along the axial direction. Although the figure is omitted, resin 90 is disposed in the first connecting hole portion 57. That is, resin 90 is disposed between the first partition wall portions 37 that are adjacent to each other in the axial direction and separated by the first connecting hole portion 57.

[0067] exist Figure 4 and Figure 6 The image shows one of several plate members 30b, namely plate member 30c. The plate member 30c is configured in... Figure 4 and Figure 6 A portion of the magnet holding part 31 located at the uppermost side is provided with first holes 53a, 54a, 55a, 56a and a first connecting hole 57. Figure 5 and Figure 7 The image shows another plate member 30d, which differs from plate member 30c, among a plurality of plate members 30b. In plate member 30d, [the plate member 30d is constructed in...] Figure 5 and Figure 7 A portion of the magnet holding part 31 located at the uppermost side is provided with second holes 53b, 54b, 55b, 56b and a first partition wall part 37. Figures 4 to 7 The diagram shows the rotor 10 in the same circumferential position. Plate members 30c and 30d are, for example, plate members 30b that are axially adjacent to each other and stacked.

[0068] In this embodiment, each magnet holding portion 31 is configured by stacking multiple first magnet holding portions 31a and multiple second magnet holding portions 31b in the axial direction. For example... Figure 6 and Figure 7 As shown, the first magnet holding part 31a has first holes 53a, 54a, 55a, 56a and a first connecting hole 57. The second magnet holding part 31b has second holes 53b, 54b, 55b, 56b and a first partition wall 37.

[0069] 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 a first hole portion 53a, 54a and a first connecting hole portion 57 in one magnet holding portion 31, a second hole portion 53b, 54b and a first partition wall portion 37 in another magnet holding portion 31.

[0070] A second magnet holding portion 31b is disposed at a position between each plate member 30b and the first magnet holding portion 31a, radially sandwiching the central axis J. A first magnet holding portion 31a is disposed between each plate member 30b and the second magnet holding portion 31b, radially sandwiching the central axis J. In other words, in each of the plurality of plate members 30b in this embodiment, the magnet holding portion 31 with the first hole portions 53a, 54a and the first connecting hole portion 57 and the magnet holding portion 31 with the second hole portions 53b, 54b and the first partition wall portion 37 are located on opposite sides of each other radially, sandwiching the central axis J.

[0071] In this embodiment, a plurality of first magnet holding portions 31a and a plurality of second magnet holding portions 31b are respectively arranged in a circumferential direction. At each plate member 30b, four first magnet holding portions 31a are arranged circumferentially. At each plate member 30b, four second magnet holding portions 31b are arranged circumferentially. The four first magnet holding portions 31a and the four second magnet holding portions 31b are respectively disposed in different circumferentially adjacent regions RE1 and RE2. Figure 6 In the diagram, regions RE1 and RE2 are shown separated by an imaginary line IL1 passing through the central axis J when viewed axially. Figure 7 In the diagram, regions RE1 and RE2 are shown separated by an imaginary line IL2 passing through the central axis J when viewed axially. The imaginary lines IL1 and IL2 are orthogonal to each other when viewed axially.

[0072] exist Figure 6 and Figure 7 The area RE1 shown is provided with four first magnet holding parts 31a. Figure 6 and Figure 7 The area RE2 shown is provided with four second magnet holding parts 31b. Figure 6 and Figure 7 In the diagram, regions RE1 and RE2 are both semi-circular arc-shaped regions with a circumferential angle of 180°. Figure 6 In this configuration, regions RE1 and RE2 are arranged to radially sandwich an imaginary line IL1. Figure 7 In this configuration, regions RE1 and RE2 are arranged to sandwich an imaginary line IL2 in the radial direction. Figure 6 A portion of RE1 shown is related to Figure 7 A portion of region RE2 shown overlaps when viewed axially. Figure 6 A portion of region RE2 shown is related to Figure 7 A portion of the region RE1 shown overlaps when viewed axially.

[0073] Thus, in each of the plurality of plate members 30b in this embodiment, the magnet holding part 31 provided with the first hole portion 53a, 54a and the first connecting hole portion 57 and the magnet holding part 31 provided with the second hole portion 53b, 54b and the first partition wall portion 37 are respectively arranged in different adjacent regions RE1, RE2 in the circumferential direction, and a plurality of them are provided in each region RE1, RE2 along the circumferential direction.

[0074] like Figure 6 and Figure 7 As shown, in this embodiment, multiple plate members 30b have the same shape. Axially adjacent plate members 30b are stacked and staggered circumferentially. For example... Figure 6 and Figure 7 As shown, in this embodiment, the axially adjacent plate members 30b are offset from each other by an angle θ of 90° in the circumferential direction. That is, in this embodiment, the rotor core body 30a is manufactured by continuously stacking plate members 30b of the same shape by rotating them 90 degrees in the circumferential direction. Figure 7 In this context, angle θ is the circumferential angle formed by imaginary lines IL1 and IL2.

[0075] like Figure 4 and Figure 5 As shown, the rotor core body 30a has a riveting portion 36 for fixing axially adjacent plate members 30b to each other. The riveting portion 36 is provided on each plate member 30b. The riveting portion 36 is a part formed by riveting a portion of the plate member 30b axially. In this embodiment, the riveting portion 36 is formed by riveting a portion of the plate member 30b to the right (-Y side). By providing the riveting portion 36, a recess 36a is provided in the plate member 30b that is recessed to the right. The riveting portion 36 provided on one plate member 30b is fitted and fixed to the recess 36a provided on another plate member 30b adjacent to the right side of the aforementioned plate member 30b. Thus, axially adjacent plate members 30b are fixed to each other by means of the riveting portion 36.

[0076] The riveting portion 36 is located circumferentially between a pair of first magnet holes 51a, 51b. The circumferential position of the riveting portion 36 includes the circumferential center position of the first partition wall portion 37. In this embodiment, the circumferential center position of the riveting portion 36 is the same as the circumferential center position of the first partition wall portion 37. The circumferential center position of the riveting portion 36 is the same as the circumferential position of the magnetic pole center line Ld. Furthermore, in... Figure 4 and Figure 5 The riveting part 36 is omitted from the diagrams other than those shown.

[0077] According to this embodiment, the first magnet hole 51a has a first hole portion 53a and a second hole portion 53b. The first hole portion 53a is provided on at least one of a plurality of plate members 30b, and the second hole portion 53b is provided on at least one plate member 30b different from the plate member 30b with the first hole portion 53a and is axially connected to the first hole portion 53a. The magnet holding part 31 has a first connecting hole portion 57 provided on the plate member 30b with the first hole portion 53a and a first partition wall portion 37 provided on the plate member 30b with the second hole portion 53b. The first connecting hole portion 57 connects the first hole portion 53a to another magnet hole 50 different from the magnet hole 50 with the first hole portion 53a, namely, the first magnet hole 51b with the first hole portion 54a in this embodiment. The first partition wall portion 37 separates the first magnet hole 51b from the second hole portion 53b and overlaps with the first connecting hole portion 57 when viewed axially. Therefore, the first connecting hole portion 57 functions as a magnetic isolation bridge portion, making it difficult for magnetic flux to pass between the first magnet hole 51a and the first magnet hole 51b. In other words, corresponding to the provision of the first connecting hole portion 57, the magnetic body portion disposed between the first magnet hole 51a and the first magnet hole 51b can be reduced, making it difficult for magnetic flux to pass between the first magnet hole 51a and the first magnet hole 51b. Therefore, leakage of magnetic flux from the first magnet hole 51a and the first magnet hole 51b can be suppressed. On the other hand, since the first partition wall portion 37 is provided that overlaps with the first connecting hole portion 57 in the axial direction, the reduction in strength of the rotor core 30 can be suppressed compared to the case where the first magnet hole 51a and the first magnet hole 51b are completely connected through holes. Therefore, the strength of the rotor core 30 can be ensured, and magnetic flux leakage can be suppressed. Therefore, deformation of the rotor core 30 in the magnet hole 50, etc., can be suppressed, and the reduction in the output of the rotary motor 60 can be suppressed.

[0078] Furthermore, according to this embodiment, a plurality of magnet holding portions 31 are provided circumferentially. Each of the plurality of plate members 30b has a first hole portion 53a and a first connecting 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. That is, the first hole portion 53a, the first connecting 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 all the plurality of plate members 30b are made to be the same shape, by continuously stacking them by staggering them in the circumferential direction, the first connecting hole portion 57 and the first partition wall portion 37 can be overlapped in the axial direction. Thus, it is possible to make all the plurality of plate members 30b the same shape, and it is possible to make the type of plate members 30b the same type. Therefore, it is possible to make the stamping die used when stamping and manufacturing the plate members 30b by stamping process the same type. Therefore, it is possible to suppress the increase in manufacturing cost of the plurality of plate members 30b, and it is possible to suppress the increase in manufacturing cost of rotor core 30. Furthermore, for example, if a first connecting hole 57 is also provided in any magnet holding portion 31 of a plate member 30b, the strength of that plate member 30b is likely to be less than the strength of other plate members 30b. In contrast, according to this embodiment, since a first partition wall portion 37 is also provided in any plate member 30b, the strength of any plate member 30b can also be ensured.

[0079] Furthermore, according to this 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 connecting hole portion 57 and the magnet holding portion 31 provided with the second hole portion 53b and the first partition wall portion 37 are located on opposite sides of each other in the radial direction, sandwiching the central axis J. That is, in this embodiment, the first magnet holding portion 31a and the second magnet holding portion 31b are located on opposite sides of each other in the radial direction, sandwiching the central axis J. Therefore, compared to the case where, for example, any magnet holding portion 31 in the portion sandwiching both sides of the central axis J is also provided with the first connecting hole portion 57, it is easier to ensure the strength of the plate member 30b. In addition, compared to the case where, for example, any magnet holding portion 31 in the portion sandwiching both sides of the central axis J is also provided with the first partition wall portion 37, it is possible to suppress the flow of magnetic flux flowing in the radial direction through the central axis J to the opposite side in the radial direction. Therefore, magnetic flux leakage can be further suppressed.

[0080] Furthermore, according to this embodiment, in each of the plurality of plate members 30b, a magnet holding portion 31 (i.e., a first magnet holding portion 31a) having a first hole portion 53a and a first connecting hole portion 57, and a magnet holding portion 31 (i.e., a second magnet holding portion 31b) having a second hole portion 53b and a first partition wall portion 37 are respectively disposed in different circumferentially adjacent regions RE1 and RE2, and a plurality of such portions are disposed in each region RE1 and RE2 along the circumferential direction. Therefore, portions with different hole shapes can be centrally disposed in each plate member 30b. As a result, the shape of the punching die when punching and manufacturing the plate member 30b can be simplified.

[0081] Furthermore, according to this embodiment, the plurality of plate members 30b are identical in shape. Axially adjacent plate members 30b are stacked and staggered circumferentially. Therefore, the rotor core body 30a can be manufactured using a single type of plate member 30b. Thus, the stamping die used in blanking and manufacturing the plate members 30b by stamping can be of a single type. Therefore, the increase in manufacturing cost of the plurality of plate members 30b can be suppressed, and the increase in manufacturing cost of the rotor core 30 can be suppressed.

[0082] Furthermore, according to this embodiment, the first connecting hole portion 57 is a connecting hole portion that connects the radially inner ends of a pair of first magnet holes 51a, 51b to each other. The first partition wall portion 37 is a partition wall portion that separates the radially inner ends of the pair of first magnet holes 51a, 51b from each other. The first partition wall portion 37 overlaps with the first connecting hole portion 57 when viewed in the axial direction. Therefore, it is possible to suppress the radial leakage of magnetic flux from the pair of first magnet holes 51a, 51b to each other, and to ensure the strength of the portion of the rotor core 30 in which the pair of first magnet holes 51a, 51b are provided.

[0083] Furthermore, according to this embodiment, the radially located edge of the inner edge of the first connecting hole portion 57 extends in a straight line when viewed axially. Therefore, compared to, for example, the radially located edge of the inner edge of the first connecting hole portion 57 extends in a curved shape when viewed axially, it is easier to punch and manufacture the first connecting hole portion 57 using a punching die.

[0084] Furthermore, according to this embodiment, the rotor core body 30a has a riveting portion 36 for fixing axially adjacent plate members 30b to each other. The riveting portion 36 is located circumferentially between a pair of first magnet holes 51a, 51b. The circumferential position of the riveting portion 36 includes the circumferential center position of the first partition wall portion 37. By providing the riveting portion 36 at such a position, it is possible to suppress the influence of the riveting portion 36 on the magnetic flux flowing in the rotor core body 30a. In addition, the riveting portion 36 facilitates the suppression of the radial flow of magnetic flux through the first partition wall portion 37. Furthermore, the riveting portion 36 facilitates the reinforcement of the portion where the first connecting hole portion 57 overlaps with the first partition wall portion 37 axially.

[0085] Furthermore, according to this embodiment, the radially inner ends of a pair of second magnet holes 52a and 52b are arranged circumferentially separate from each other. The minimum value of the circumferential dimension L1 of the first partition wall portion 37 is less 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 easier to reduce the circumferential dimension L1 of the first partition wall portion 37, and easier to reduce the magnetic flux flowing in the first partition wall portion 37. Therefore, magnetic flux leakage can be further suppressed. In addition, it is easier 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 easier to further increase the strength at the portion of the rotor core 30 fixed to the radially inner side of the shaft 20, and deformation of the rotor core 30 can be further suppressed.

[0086] <Second Implementation>

[0087] In the following descriptions, for structures identical to those described in the embodiments above, the explanations will sometimes be omitted by appropriately using the same symbols. For example... Figure 8 As shown, in the rotor core 230 of the rotor 210 of this embodiment, the magnet holding portion 231 has a second connecting hole portion 258. The second connecting hole portion 258 is a connecting hole portion that connects the radially inner ends of a pair of second magnet holes 252a and 252b to each other. The second connecting hole portion 258 connects the radially inner end of the first hole portion 255a of the second magnet hole 252a to the radially inner end of the first hole portion 256b of the second magnet hole 252b. In this embodiment, the second connecting hole portion 258 is provided in each plate member 30b in the magnet holding portion 231, i.e., the first magnet holding portion 231a, which is provided with the first connecting hole portion 57.

[0088] The radially located edge of the inner edge of the second connecting hole 258 extends in a straight line when viewed axially. Therefore, similar to the first connecting hole 57 described above, the second connecting hole 258 can be easily punched and manufactured using a punching die. The radially outer edge of the inner edge of the second connecting hole 258 extends in a direction orthogonal to the magnetic pole center line Ld when viewed axially, connecting the radially outer edge of the first hole 255a to the radially outer edge of the first hole 256a. The radially inner edge of the inner edge of the second connecting hole 258 extends in a direction orthogonal to the magnetic pole center line Ld when viewed axially, connecting the radially inner edge of the first hole 255a to the radially inner edge of the first hole 256a.

[0089] The magnet holding portion 231 has a second partition wall portion 238. The second partition wall portion 238 is a partition wall portion that separates the radially inner ends of a pair of second magnet holes 252a, 252b from each other. The second partition wall portion 238 separates the radially inner end of the second hole portion 255b of the second magnet hole 252a from the radially inner end of the second hole portion 256b of the second magnet hole 252b. In this embodiment, the second partition wall portion 238 is provided in each plate member 30b in the magnet holding portion 231, i.e., the second magnet holding portion 231b, which is provided with the first connecting hole portion 37. The second partition wall portion 238 overlaps with the second connecting hole portion 258 when viewed axially. The shape of the second partition wall portion 238 when viewed axially is, for example, the same as the shape of the bridging portion 37a in the first embodiment when viewed axially.

[0090] The other structures of each part of the rotor core 230 are the same as those of each part of the rotor core 30 in the first embodiment. The other structures of each part of the rotor core 210 are the same as those of each part of the rotor core 10 in the first embodiment.

[0091] According to this embodiment, the second connecting hole portion 258 is a connecting hole portion that connects the radially inner ends of a pair of second magnet holes 252a and 252b to each other. The second partition wall portion 238 is a partition wall portion that separates the radially inner ends of the pair of second magnet holes 252a and 252b from each other. The second partition wall portion 238 overlaps with the second connecting hole portion 258 when viewed in the axial direction. Therefore, it is possible to suppress the radial leakage of magnetic flux from the pair of second magnet holes 252a and 252b to each other, and to ensure the strength of the portion of the rotor core 230 in which the pair of second magnet holes 252a and 252b are provided.

[0092] Furthermore, in each magnet holding portion 231, the plate member 30b provided with the second connecting hole portion 258 may be a different plate member 30b from the plate member 30b provided with the first connecting hole portion 57. That is, the first magnet holding portion 231a may have the first connecting hole portion 57 and the second partition wall portion 238, and the second magnet holding portion 231b, which is axially connected to the first magnet holding portion 231a, may have the second connecting hole portion 258 and the first partition wall portion 37.

[0093] <Third Implementation Method>

[0094] In the following descriptions, for structures identical to those described in the embodiments above, the explanations will sometimes be omitted by appropriately using the same symbols. For example... Figure 9 As shown, in the rotor core 330 of the rotor 310 of this 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. The first connecting hole portion 357 is the same as the second connecting hole portion 258 in the second embodiment. The first partition wall portion 337 is the same as the second connecting hole portion 238 in the second embodiment.

[0095] In this embodiment, each magnet holding portion 331 has only one second magnet hole 352. The second magnet hole 352 is located circumferentially between the radially outer ends of the pair of first magnet holes 351a and 351b. When viewed axially, the second magnet hole 352 extends in a direction intersecting the radial direction. In this embodiment, the intersecting direction in which the second magnet hole 352 extends when viewed axially is a direction orthogonal to the magnetic pole centerline Ld when viewed axially.

[0096] The pair of first magnets 341a and 341b, respectively disposed in a pair of first magnet holes 351a and 351b, are identical to the pair of second magnets 42a and 42b in the first and second embodiments, respectively. A second magnet 342 disposed in a second magnet hole 352 extends in the direction intersecting the extension of the second magnet hole 352 when viewed axially. In this embodiment, the second magnet 342 extends in a direction orthogonal to the magnetic pole centerline Ld when viewed axially. The other structures of the second magnet 342 are the same as those of the magnets 40 in the first embodiment.

[0097] In this embodiment, when viewed axially, the pair of first magnet holes 351a, 351b and the second magnet hole 352 are along... Shape configuration. A pair of first magnets 341a, 341b and second magnet 341 are viewed along the axial direction. Shape configuration. By arranging the magnet holes and magnets as described above, magnetic flux can flow well between the rotor 310 and the stator 61. As a result, the output of the rotary motor 60 can be obtained better.

[0098] The other structures of each part of the rotor core 330 are the same as those of each part of the rotor core 30 in the first embodiment. The other structures of each part of the rotor 310 are the same as those of each part of the rotor 10 in the first embodiment.

[0099] <Fourth Implementation>

[0100] In the following descriptions, for structures identical to those described in the embodiments above, the explanations will sometimes be omitted by appropriately using the same symbols. For example... Figure 10 As shown, in the rotor core 430 of the rotor 410 of this embodiment, the pair of first magnet holes 451a and 451b provided in the magnet holding part 431 are the same as the pair of second magnet holes 52a and 52b in the first embodiment, except that they are connected to the radial outer surface 430s of the rotor core body 430a through the fourth connecting hole parts 459a and 459b described later.

[0101] A pair of second magnet holes 452a and 452b are provided in the magnet holding part 431. The pair of second magnet holes 452a and 452b are located circumferentially between the radially outer ends of a pair of first magnet holes 451a and 451b. The pair of second magnet holes 452a and 452b extend in a direction intersecting the radial direction when viewed axially. In this embodiment, the intersecting direction in which the second magnet holes 452a and 452b extend when viewed axially is a direction orthogonal to the magnetic pole center line Ld when viewed axially. The pair of second magnet holes 452a and 452b are arranged in this intersecting direction.

[0102] The magnet holding part 431 has a third connecting hole part 458. The third connecting hole part 458 is a connecting hole part that connects a pair of second magnet holes 452a, 452b to each other. The third connecting hole part 458 connects the end of the second magnet hole 452a in the first hole part 455a of the second magnet hole 452a to the end of the second magnet hole 452b in the first hole part 456a of the second magnet hole 452b on the side of the second magnet hole 452a. The shape of the hole formed by the first hole part 455a, the first hole part 456a and the third connecting hole part 458 is the same as the shape of the second magnet hole 352 in the third embodiment when viewed in the axial direction. The third connecting hole part 458 extends in the radial direction. The circumferential center position of the third connecting hole part 458 is the same as the circumferential position of the magnetic pole center line Ld.

[0103] The magnet holding part 431 has a third partition wall part 438. The third partition wall part 438 is a partition wall part that separates a pair of second magnet holes 452a, 452b from each other. The third partition wall part 438 separates the end of the second hole portion 455b of the second magnet hole 452a on the second magnet hole 452b from the end of the second hole portion 456b of the second magnet hole 452b on the second magnet hole 452a. The third partition wall part 438 overlaps with the third connecting hole part 458 when viewed in the axial direction. The third partition wall part 438 extends in the radial direction. The circumferential center position of the third partition wall part 438 is the same as the circumferential position of the magnetic pole center line Ld.

[0104] The magnet holding part 431 has fourth connecting holes 459a and 459b. The fourth connecting hole 459a is a connecting hole that connects the first hole 453a of the first magnet hole 451a to the radially outer surface 430s of the rotor core body 430a. The fourth connecting hole 459b is a connecting hole that connects the first hole 454a of the first magnet hole 451b to 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 through the fourth connecting holes 459a and 459b. In this embodiment, the fourth connecting holes 459a and 459b are provided in each plate member 30b within the magnet holding part 431, i.e., the first magnet holding part 431a, which is provided with the third connecting hole 458.

[0105] The magnet holding part 431 has fourth partition wall parts 439a and 439b. The fourth partition wall part 439a is a partition wall part that separates the radially outer surface 430s of the rotor core body 430a from the second hole 453b of the first magnet hole 451a. The fourth partition wall part 439b is a partition wall part that separates the radially outer surface 430s of the rotor core body 430a from the second hole 454b of the first magnet hole 451b. The fourth partition wall parts 439a and 439b extend in the circumferential direction. The radially outer surface of the fourth partition wall parts 439a and 439b forms a part of the radially outer surface 430s of the rotor core body 430a. When viewed axially, the fourth partition wall part 439a overlaps with the fourth connecting hole 459a. When viewed axially, the fourth partition wall part 439b overlaps with the fourth connecting hole 459b. In this embodiment, the fourth partition walls 439a and 439b are provided in each plate member 30b in the magnet holding part 431, i.e., the second magnet holding part 431b, which is provided with the third partition wall 438.

[0106] The pair of first magnets 441a and 441b, respectively disposed in a pair of first magnet holes 451a and 451b, are identical to the pair of second magnets 42a and 42b in the first and second embodiments, respectively. The pair of second magnets 442a and 442b, respectively disposed in a pair of second magnet holes 452a and 452b, extend in the intersecting directions of the second magnet holes 452a and 452b when viewed axially. In this embodiment, the pair of second magnets 442a and 442b extend in directions orthogonal to the magnetic pole center line Ld when viewed axially. The pair of second magnets 442a and 442b are configured to be symmetrical with respect to the magnetic pole center line Ld when viewed axially. The other structures of the second magnets 442a and 442b are identical to the other structures of each magnet 40 in the first embodiment.

[0107] The other structures of each part of the rotor core 430 are the same as those of each part of the rotor core 330 in the third embodiment. The other structures of each part of the rotor 410 are the same as those of each part of the rotor 310 in the third embodiment.

[0108] According to this embodiment, the third connecting hole portion 458 is a connecting hole portion that connects a pair of second magnet holes 452a and 452b to each other. The third partition wall portion 438 is a partition wall portion that separates the pair of second magnet holes 452a and 452b from each other. The third partition wall portion 438 overlaps with the third connecting hole portion 458 when viewed in the axial direction. Therefore, it is possible to suppress radial leakage of magnetic flux from the pair of second magnet holes 452a and 452b to each other, and to ensure the strength of the portion of the rotor core 430 in which the pair of second magnet holes 452a and 452b are provided.

[0109] Furthermore, according to this embodiment, the fourth connecting hole portion 459a is a connecting hole portion that connects the first hole portion 453a to the radially outer surface 430s of the rotor core body 430a. The fourth partition wall portion 439a is a partition wall portion that separates the radially outer surface 430s of the rotor core body 430a from the second hole portion 453b. The fourth partition wall portion 439a overlaps with the fourth connecting hole portion 459a when viewed axially. Therefore, circumferential leakage of magnetic flux between the first magnet hole 451a and the radially outer surface 430s can be suppressed, and the strength of the portion of the rotor core 430 where the first magnet hole 451a is provided can be ensured. This effect can also be obtained by the fourth connecting hole portion 459b and the fourth partition wall portion 439b.

[0110] Furthermore, in each magnet holding portion 431, the plate member 30b provided with the third connecting hole portion 458 may be a different plate member 30b from the plate member 30b provided with the fourth connecting holes 459a and 459b. That is, the first magnet holding portion 431a may have the third connecting hole portion 458 and the fourth partition wall portions 439a and 439b, and the second magnet holding portion 431b, which is axially connected to the first magnet holding portion 431a, may have the fourth connecting holes 459a and 459b and the third partition wall portion 438. Additionally, in each magnet holding portion 431, the plate member 30b provided with the fourth connecting hole portion 459a may be a different plate member 30b from the plate member 30b provided with the fourth connecting hole portion 459b. In other words, the first magnet holding part 431a may have a fourth connecting hole part 459a and a fourth partition wall part 439b, and the second magnet holding part 431b, which is axially connected to the first magnet holding part 431a, may have a fourth connecting hole part 459b and a fourth partition wall part 439a.

[0111] This invention is not limited to the embodiments described above. Other structures and methods can be employed within the scope of the technical concept of this invention. The magnet hole having the first hole and the second hole only needs to be provided in at least one of the plurality of magnet holes. The connecting hole and the partition wall only need to overlap each other when viewed axially. When multiple connecting holes and partition walls are provided respectively, the multiple connecting holes and multiple partition walls can be arranged in any way along the axial direction. The connecting holes and partition walls can also be arranged alternately one by one along the axial direction. The connecting hole can be provided in any way as long as it connects the first hole to a portion of either the magnet hole or the radially outer surface of the rotor core body that is different from the magnet hole having the first hole. Only one of the connecting holes in each of the above embodiments can be provided, or two or more of the connecting holes in each of the above embodiments can be provided.

[0112] The connecting hole portion may include any one or more of the first connecting hole portion, second connecting hole portion, third connecting hole portion, and fourth connecting hole portion, or may include connecting hole portions other than the first connecting hole portion, second connecting hole portion, third connecting hole portion, and fourth connecting hole portion. The partition wall portion may also include any one or more of the first partition wall portion, second partition wall portion, third partition wall portion, and fourth partition wall portion, or may include partition wall portions other than the first partition wall portion, second partition wall portion, third partition wall portion, and fourth partition wall portion. For example, in the third embodiment described above, a connecting hole portion may be provided that connects one end of the second magnet hole 352 in the direction in which the second magnet hole 352 extends when viewed axially to either the first magnet hole 351a or the first magnet hole 351b. The shape of the connecting hole portion and the shape of the partition wall portion are not particularly limited.

[0113] The second magnet hole can be of any shape and can be positioned anywhere, as long as it is different from the pair of first magnet holes. There is no particular limitation on the number of second magnet holes provided in the magnet holding part.

[0114] A pair of protrusions may also be provided on the inner side of the first hole. In this case, a pair of protrusions may also be provided on the inner side of the second hole, or a pair of protrusions may not be provided on the inner side of the second hole.

[0115] When axially adjacent plate members are stacked and staggered circumferentially, the circumferential angle θ between the plate members is not particularly limited. For example, the circumferential angle θ between axially adjacent plate members can be 45° or 180°. The multiple plate members constituting the rotor core body may also include two or more types of plate members with different shapes. The riveting portions that fix the plate members to each other can be provided in any position. The plate members can also be fixed to each other by means other than riveting portions. In each plate member, the magnet holding portion provided with the first hole and the connecting hole, and the magnet holding portion provided with the second hole and the partition wall, can also be arranged in any way. The multiple plate members may also include plate members provided with the first hole and the connecting hole but without the second hole and the partition wall, and may also include plate members provided with the second hole and the partition wall but without the first hole and the connecting hole.

[0116] The rotary electric motor using this invention is not limited to a motor, but can also be a generator. The application of the rotary electric motor is not particularly limited. The rotary electric motor can be installed in equipment other than vehicles. The application of the drive device used in this invention is not particularly limited. For example, the drive device can be installed in a vehicle for purposes other than rotating the axle, or in equipment other than vehicles. The posture when using the rotary electric motor and drive device is not particularly limited. The central axis of the rotary electric motor can be inclined relative to a horizontal direction orthogonal to the vertical direction, or it can extend along the vertical direction. The structures described above in this specification can be appropriately combined within a non-contradictory range.

[0117] Symbol Explanation

[0118] 10, 210, 310, 410 rotors

[0119] 30, 230, 330, 430 rotor cores

[0120] 30a and 430a rotor core body

[0121] 30b, 30c, 30d plate components

[0122] 31, 231, 331, 431 Magnet holding parts

[0123] Protrusions 32a, 33a, 34a, 35a

[0124] 36 Riveting Part

[0125] 37, 337 First partition wall section (partition wall section)

[0126] 40 magnets

[0127] 41a, 41b, 341a, 341b, 441a, 441b First magnet (magnet)

[0128] 42a, 42b, 342, 442a, 442b Second magnet (magnet)

[0129] 50 Magnet Holes

[0130] 51a, 51b, 351a, 351b, 451a, 451b First magnet hole

[0131] 52, 52a, 52b, 252a, 252b, 352, 452a, 452b Second magnet holes

[0132] 53a, 54a, 55a, 56a, 255a, 256a, 453a, 454a, 455a, 456a First Hole Section

[0133] 53b, 54b, 55b, 56b, 255b, 256b, 453b, 454b, 455b, 456b Second Hole Section

[0134] 57, 357 First connecting hole section (connecting hole section)

[0135] 60 Rotary Motor

[0136] 61 Stator

[0137] 70 Gear Mechanism

[0138] 100 drive unit

[0139] 238 Second partition wall section (partition wall section)

[0140] 258 Second connecting hole section (connecting hole section)

[0141] 430s Radial outer surface

[0142] 438 Third partition wall section (partition wall section)

[0143] 439a, 439b Fourth partition wall section (partition wall section)

[0144] 458 Third connecting hole section (connecting hole section)

[0145] 459a, 459b Fourth connecting hole section (connecting hole section)

[0146] J central axis

[0147] RE1 and RE2 regions.

Claims

1. A rotor core, which is a rotor core of a rotor capable of rotating about a central axis, characterized in that, It includes a rotor core body, which is composed of multiple plate components stacked axially. The rotor core body has a magnet holding part, which has multiple magnet holes. The plurality of magnet holes include: A pair of first magnet holes that are adjacent to each other in the circumferential direction; and The second magnet hole is different from the first magnet hole. The pair of first magnet holes extend in a direction that separates from each other circumferentially as viewed axially. At least one of the plurality of magnet holes has: A first hole is provided in at least one of the plurality of plate members; and A second hole is provided on at least one plate member, different from the plate member with the first hole, and is axially connected to the first hole. The magnet holding part has: A connecting hole portion is provided on the plate member having the first hole portion; and A partition wall portion is provided on the plate member having the second hole portion. Furthermore, multiple magnet holding portions are arranged circumferentially. The connecting hole connects the first hole to a portion of either another magnet hole (different from the magnet hole with the first hole) or a portion of the radially outer surface of the rotor core body. The partition wall separates a portion of the first portion from the second hole portion, and overlaps with the connecting hole portion when viewed axially. Each of the aforementioned magnet holding portions has a first magnet holding portion and a second magnet holding portion stacked in the axial direction. The first magnet holding portion has the first hole portion and the connecting hole portion. The second magnet holding portion has the second hole portion and the partition wall portion. Each of the plurality of plate components has a first region and a second region that are adjacent in the circumferential direction. The portion of the magnet holding part disposed in the first region is the first magnet holding part. Four first magnet holding parts are arranged circumferentially in the first region. The portion of the magnet holding part disposed in the second region is the second magnet holding part. Four second magnet holding parts are arranged circumferentially in the second region. The first magnet holding part and the second magnet holding part have different shapes when viewed along the axial direction. The circumferential angles of the first region and the second region are both 180°. The axially adjacent plate members are offset from each other by an angle of 90° in the circumferential direction.

2. The rotor core as described in claim 1, characterized in that, In each of the plurality of plate components, the first magnet holding portion having the first hole and the connecting hole and the second magnet holding portion having the second hole and the partition wall are located on opposite sides of each other in the radial direction, sandwiching the central axis.

3. The rotor core as described in claim 1, characterized in that, A pair of protrusions are provided on the inner side of at least one of the first hole and the second hole to clamp the magnet disposed in the magnet hole.

4. The rotor core as described in claim 3, characterized in that, The pair of protrusions are provided only on the inner side of the first hole of the first magnet holding part and the inner side of the second hole of the second magnet holding part.

5. The rotor core as described in claim 1, characterized in that, The connecting hole portion includes a first connecting hole portion that connects the radially inner ends of the pair of first magnet holes to each other. The partition wall includes a first partition wall that separates the radially inner ends of the pair of first magnet holes from each other. When viewed axially, the first partition wall overlaps with the first connecting hole.

6. A rotor core, which is a rotor core of a rotor capable of rotating about a central axis, characterized in that, It includes a rotor core body, which is composed of multiple plate components stacked axially. The rotor core body has a magnet holding part, which has multiple magnet holes. The plurality of magnet holes include: A pair of first magnet holes that are adjacent to each other in the circumferential direction; and The second magnet hole is different from the first magnet hole. The pair of first magnet holes extend in a direction that separates from each other circumferentially as viewed axially. At least one of the plurality of magnet holes has: A first hole is provided in at least one of the plurality of plate members; and A second hole is provided on at least one plate member, different from the plate member with the first hole, and is axially connected to the first hole. The magnet holding part has: A connecting hole portion is provided on the plate member having the first hole portion; and A partition wall portion is provided on the plate member having the second hole portion. The connecting hole connects the first hole to a portion of either another magnet hole (different from the magnet hole with the first hole) or a portion of the radially outer surface of the rotor core body. The partition wall separates a portion of the first portion from the second hole portion, and overlaps with the connecting hole portion when viewed axially. The connecting hole portion includes a first connecting hole portion that connects the radially inner ends of the pair of first magnet holes to each other. The partition wall includes a first partition wall that separates the radially inner ends of the pair of first magnet holes from each other. When viewed axially, the first partition wall portion overlaps with the first connecting hole portion. The magnet holding portion has a first magnet holding portion and a second magnet holding portion stacked in the axial direction. The first magnet holding portion has the first hole portion and the first connecting hole portion. The second magnet holding portion has the second hole portion and the first partition wall portion. In the inner side of the first hole of the first magnet holding part and the inner side of the second hole of the second magnet holding part, only the inner side of the second hole of the second magnet holding part is provided with a pair of protrusions that clamp the magnet disposed in the magnet hole.

7. The rotor core as described in claim 5 or 6, characterized in that, The radial edge of the inner edge of the first connecting hole extends in a straight line when viewed axially.

8. The rotor core as described in claim 5 or 6, characterized in that, The rotor core body has a riveting portion that fixes the axially adjacent plate members to each other. The riveting portion is located circumferentially between the pair of first magnet holes. The circumferential position of the riveted part includes the circumferential center position of the first partition wall part.

9. The rotor core as described in claim 5 or 6, characterized in that, The plurality of magnet holes includes a pair of second magnet holes that are circumferentially adjacent to each other. A pair of second magnet holes are located radially inside the pair of first magnet holes, and extend circumferentially away from each other when viewed axially. The radially inner ends of a pair of second magnet holes are arranged circumferentially separated from each other. The minimum circumferential dimension of the first partition wall is less than the minimum circumferential distance between the radial inner ends of the pair of second magnet holes.

10. The rotor core as described in any one of claims 1 to 6, characterized in that, The plurality of magnet holes includes a pair of second magnet holes that are circumferentially adjacent to each other. A pair of second magnet holes are located radially inside the pair of first magnet holes and extend circumferentially away from each other when viewed axially.

11. The rotor core as described in claim 9, characterized in that, The connecting hole portion includes a second connecting hole portion that connects the radially inner ends of a pair of second magnet holes to each other. The partition wall includes a second partition wall that separates the radially inner ends of a pair of second magnet holes from each other. When viewed axially, the second partition wall overlaps with the second connecting hole.

12. The rotor core as described in any one of claims 1 to 6, characterized in that, The second magnet hole is located circumferentially between the radially outer ends of the pair of first magnet holes and extends in a cross direction that intersects the radial direction when viewed axially.

13. The rotor core as described in claim 12, characterized in that, A pair of second magnet holes are arranged in the intersecting direction. The connecting hole portion includes a third connecting hole portion that connects a pair of second magnet holes to each other. The partition wall includes a third partition wall that separates the pair of second magnet holes from each other. When viewed axially, the third partition wall overlaps with the third connecting hole.

14. The rotor core as described in claim 6, characterized in that, Multiple magnet holding parts are arranged circumferentially. Each of the plurality of plate components has a first magnet holding portion in one of the magnet holding portions and a second magnet holding portion in another of the magnet holding portions.

15. The rotor core as described in claim 14, characterized in that, In each of the plurality of plate components, the first magnet holding portion having the first hole and the connecting hole and the second magnet holding portion having the second hole and the partition wall are located on opposite sides of each other in the radial direction, sandwiching the central axis.

16. The rotor core as described in claim 14 or 15, characterized in that, In each of the plurality of plate components, the first magnet holding portion having the first hole and the connecting hole and the second magnet holding portion having the second hole and the partition wall portion are respectively disposed in different regions adjacent to each other in the circumferential direction, and a plurality of them are respectively disposed in each of the regions along the circumferential direction.

17. The rotor core as described in any one of claims 1 to 6, characterized in that, The plurality of plate components have the same shape as each other. The plate members that are axially adjacent are stacked on top of each other in the circumferential direction, staggered from each other.

18. The rotor core as described in any one of claims 1 to 6, characterized in that, The connecting hole portion includes a fourth connecting hole portion that connects the first hole portion to the radially outer surface of the rotor core body. The partition wall portion includes a fourth partition wall portion that separates the radially outer side surface of the rotor core body from the second hole portion. When viewed axially, the fourth partition wall overlaps with the fourth connecting hole.

19. A rotary electric motor, characterized in that, include: A rotor having a rotor core as described in any one of claims 1 to 18 and a plurality of magnets respectively disposed in the plurality of magnet holes; as well as The stator is positioned opposite the rotor with a gap between them.

20. A driving device, characterized in that, include: The rotary motor according to claim 19; as well as A gear mechanism connected to the rotary motor.

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