Rotor, rotating electrical machine, and drive device

Abstract

A rotor according to one embodiment of the present invention is rotatable about a central axis, and is provided with: a rotor core; and a fan disposed so as to face the rotor core in the axial direction. The rotor iron core is provided with a vent hole penetrating through the rotor iron core in the axial direction. The fan has an opening disposed so as to face the vent hole. The rotor core is provided with a first rotation stopper. The fan is provided with a second rotation stopping part which is in contact with the first rotation stopping part in the circumferential direction.

Description

Technical Field

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

[0002] This application claims priority based on Japanese Patent Application No. 2022-157335 filed in Japan on September 30, 2022, the contents of which are cited here. Background Art

[0003] There is known a rotating electrical machine having a structure in which an internal fan is arranged at an axial end of a rotor core and air sent by the internal fan flows through a flow hole provided in the rotor core. For example, the internal fan is fixed to a rotating shaft (for example, see Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-211862 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the above-mentioned rotating electrical machine, if the position of the internal fan relative to the rotor core in the circumferential direction is offset due to dimensional tolerance, assembly tolerance, etc., air may have difficulty flowing into the flow holes, resulting in reduced air blowing efficiency of the internal fan.

[0009] In view of the above circumstances, one object of the present invention is to provide a rotor, a rotating electrical machine, and a driving device having a structure capable of improving the air blowing efficiency of a fan.

[0010] Means for solving problems

[0011] A rotor of one embodiment of the present invention is capable of rotating around a central axis, wherein the rotor comprises: a rotor core; and a fan arranged in an axially opposed manner to the rotor core. The rotor core comprises an air vent extending through the rotor core in the axial direction. The fan comprises an opening arranged in an opposed manner to the air vent. A first anti-rotation portion is provided on the rotor core. A second anti-rotation portion is provided on the fan and is in circumferential contact with the first anti-rotation portion.

[0012] A rotating electrical machine according to one aspect of the present invention includes: the above-mentioned rotor; and a stator facing the rotor with a gap therebetween in a radial direction.

[0013] A driving device according to one aspect of the present invention includes: the above-described rotating electrical machine; and a power transmission unit that transmits power of the rotating electrical machine.

[0014] Effects of the Invention

[0015] According to one aspect of the present invention, in a rotating electrical machine and a driving device, it is possible to improve the efficiency of sending air by a fan included in a rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a diagram schematically showing the driving device in the first embodiment.

[0017] Figure 2 It is a cross-sectional view showing the rotor in the first embodiment.

[0018] Figure 3 This is a cross-sectional view showing a part of the rotor in the first embodiment.

[0019] Figure 4 It is a perspective view showing the fan and the anti-dropping member in the first embodiment.

[0020] Figure 5 is a perspective view showing the fan in the first embodiment, which is viewed from the Figure 4 Pictures of the fan viewed from different angles.

[0021] Figure 6 It is a cross-sectional view showing a part of the rotor in the second embodiment.

[0022] Figure 7 This is a cross-sectional view showing a part of the rotor in the third embodiment.

[0023] Figure 8 It is a cross-sectional view showing a part of the rotor in the fourth embodiment.

[0024] Fig. 9 This is a cross-sectional view showing a part of the rotor in the fifth embodiment. DETAILED DESCRIPTION

[0025] In the following description, the vertical direction is defined and described based on the positional relationship when the drive device of the embodiment is mounted on a vehicle located on a horizontal road surface. That is, the relative positional relationship related to the vertical direction described in the following embodiments only needs to be satisfied at least when the drive device is mounted on a vehicle located on a horizontal road surface.

[0026] In the accompanying 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 the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is referred to as the "upper side", and the lower side in the vertical direction is referred to as the "lower side". The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-to-back direction of a vehicle equipped with a drive device. 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 perpendicular to both the X-axis direction and the Z-axis direction, and is the left-to-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-to-back direction and the left-to-right direction are horizontal directions perpendicular to the vertical direction.

[0027] In addition, the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the -X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle. In addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "vertical direction" also includes a substantially vertical direction.

[0028] The center axis J shown in the figure appropriately is an imaginary axis extending in a direction intersecting the vertical direction. In more detail, the center axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the center axis J is referred to as the "axial direction", the radial direction centered on the center axis J is referred to as the "radial direction", and the circumferential direction centered on the center axis J, that is, the direction around the center axis J is referred to as the "circumferential direction". In the following embodiments, the left side (+Y side) is referred to as the "one axial side", and the right side (-Y side) is referred to as the "other axial side".

[0029] <First embodiment>

[0030] Figure 1 The drive device 100 of the present embodiment shown is a drive device mounted on a vehicle and rotates the axle 73. The vehicle equipped with the drive device 100 is a vehicle that uses a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). Figure 1 As shown, the drive device 100 includes a rotary electric machine 60, a power transmission unit 70 that transmits power of the rotary electric machine 60, and a housing 63 that accommodates the rotary electric machine 60 and the power transmission unit 70. In the present embodiment, the rotary electric machine 60 is a motor.

[0031] The housing 63 accommodates the rotating electric machine 60 and the power transmission unit 70. The housing 63 includes a motor housing 63a accommodating the rotating electric machine 60 and a gear housing 63b accommodating the power transmission unit 70. The motor housing 63a is connected to the other axial side (-Y side) of the gear housing 63b.

[0032] The gear housing 63b contains oil O. The oil O is stored in the lower region of the gear housing 63b. The oil O is used as lubricating oil in the power transmission unit 70. As the oil O, for example, an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) having a relatively low viscosity is preferably used in order to realize the function of lubricating oil.

[0033] The power transmission unit 70 is connected to the rotary motor 60, and transmits the rotation of the rotor 10 described later to the axle 73 of the vehicle. The power transmission unit 70 of the present embodiment has a reduction gear 71 connected to the rotary motor 60 and a differential device 72 connected to the reduction gear 71. The differential device 72 has a ring gear 72a. The torque output from the rotary motor 60 is transmitted to the ring gear 72a via the reduction gear 71. The lower end of the ring gear 72a is immersed in the oil O stored in the gear housing 63b. The oil O is lifted up by the rotation of the ring gear 72a. The lifted oil O is provided to the reduction gear 71 and the differential device 72 as lubricating oil, for example.

[0034] The rotating electric machine 60 includes: a rotor 10 that can rotate around a central axis J; and a stator 61 that is opposed to the rotor 10 in the radial direction with a gap therebetween. In the present embodiment, the stator 61 is located radially outside the rotor 10. The stator 61 includes a stator core 61a and a coil assembly 61b mounted on the stator core 61a. The coil assembly 61b includes a plurality of coils 61c mounted on the stator core 61a. Although not shown in the figure, the coil assembly 61b may also include a bundling member for bundling the coils 61c, or may include a lap wire that connects the coils 61c to each other. The coil assembly 61b includes coil ends 61d and 61e that protrude axially from the stator core 61a. The coil end 61d protrudes axially to one side (+Y side) than the stator core 61a. The coil end 61e protrudes axially to the other side (-Y side) than the stator core 61a.

[0035] like Figure 2 As shown, the rotor 10 has a rotor shaft 20, a rotor core 30, and a plurality of magnets 40. Figure 1 As shown, the rotor shaft 20 extends in the axial direction along the central axis J. A reduction gear 71 is connected to the end portion on one axial side (+Y side) of the rotor shaft 20. In the present embodiment, the rotor shaft 20 is a cylindrical hollow shaft centered on the central axis J.

[0036] like Figure 2 As shown, the rotor core 30 is fixed to the outer peripheral surface of the rotor shaft 20. The rotor core 30 is substantially cylindrical with the center axis J as the center. The rotor core 30 has a through hole 30h that penetrates the rotor core 30 in the axial direction. The center axis J passes through the inside of the through hole 30h. In the present embodiment, the through hole 30h is a circular hole with the center axis J as the center. The rotor shaft 20 passes through the through hole 30h in the axial direction. The inner peripheral surface of the through hole 30h is fixed to the outer peripheral surface of the rotor shaft 20. The rotor shaft 20 is, for example, press-fitted into the through hole 30h.

[0037] The rotor core 30 is made of a magnetic material. Although not shown in the figure, the rotor core 30 is formed by stacking a plurality of plate members in the axial direction. The plate members are, for example, electromagnetic steel plates. Figure 1 As shown, the rotor core 30 has a plurality of core pieces 30p arranged in an axial direction. The plurality of core pieces 30p are respectively formed by stacking the plurality of plate members in the axial direction. The core pieces 30p adjacent to each other in the axial direction are in contact with each other. In addition, other plate-shaped members may be sandwiched between the core pieces 30p adjacent to each other in the axial direction. Figure 1 In the example of , three core members 30p are provided. Although not shown in the figure, the plurality of core members 30p are arranged in a manner that the circumferential positions are staggered from each other. That is, in the present embodiment, a step skew is provided on the rotor 10 .

[0038] like Figure 2 As shown, the rotor core 30 has a plurality of magnet retaining portions 31 arranged in a circumferential direction. The plurality of magnet retaining portions 31 are provided in the radially outer portion of the rotor core 30. The plurality of magnet retaining portions 31 are arranged at equal intervals throughout the entire circumference along the circumferential direction. In this embodiment, eight magnet retaining portions 31 are provided.

[0039] The plurality of magnet holding portions 31 each have a pair of magnet holes 51a, 51b adjacent to each other in the circumferential direction. That is, the rotor core 30 has a pair of magnet holes 51a, 51b. In the present embodiment, the pair of magnet holes 51a, 51b penetrate the rotor core 30 in the axial direction. In addition, the pair of magnet holes 51a, 51b may also be holes having a bottom at the end in the axial direction.

[0040] One magnet 40 is disposed in each of the two magnet holes 51a and 51b in each magnet holding portion 31. 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 rectangular parallelepiped that is long in the axial direction. The magnet 40 may extend from one axial end portion of the rotor core 30 to the other axial end portion.

[0041] The plurality of magnets 40 include a pair of magnets 41a, 41b respectively arranged in a pair of magnet holes 51a, 51b. The pair of magnets 41a, 41b are respectively fixed in the pair of magnet holes 51a, 51b. The method of fixing each magnet 41a, 41b to each magnet hole 51a, 51b is not particularly limited. For example, each magnet 41a, 41b may be fixed in each magnet hole 51a, 51b by caulking a portion of the rotor core 30, or may be fixed in each magnet hole 51a, 51b by using a resin filled in a portion other than the portion where the magnets 41a, 41b are arranged in each magnet hole 51a, 51b, or may be fixed in each magnet hole 51a, 51b by using a foam sheet arranged in a portion other than the portion where the magnets 41a, 41b are arranged in each magnet hole 51a, 51b.

[0042] The magnetic pole portion 10P is composed of a magnet holding portion 31 and a pair of magnets 41a and 41b arranged in a pair of magnet holes 51a and 51b provided in the magnet holding portion 31. A plurality of magnetic pole portions 10P are arranged at equal intervals throughout the entire circumference along the circumferential direction. In the present embodiment, eight magnetic pole portions 10P are provided. The plurality of magnetic pole portions 10P include a plurality of magnetic pole portions 10N whose magnetic poles on the outer circumferential surface of the rotor core 30 are N poles and a plurality of magnetic pole portions 10S whose magnetic poles on the outer circumferential surface of the rotor core 30 are S poles. In the present embodiment, four magnetic pole portions 10N and four magnetic pole portions 10S are provided. The four magnetic pole portions 10N and the four magnetic pole portions 10S are alternately arranged along the circumferential direction. The structure of each magnetic pole portion 10P is the same except that the magnetic poles on the outer circumferential surface of the rotor core 30 are different and the circumferential positions are different.

[0043] like Figure 3 As shown, in the magnetic pole portion 10P, the magnet hole 51a and the magnet hole 51b are arranged with the first imaginary line Ld in between in the circumferential direction. The first imaginary line Ld is an imaginary line that passes through the circumferential center between a pair of magnet holes 51a and 51b and extends in the radial direction. The first imaginary line Ld is a magnetic pole center line that passes through the circumferential center of the magnetic pole portion 10P. The circumferential center of the magnetic pole portion 10P is the circumferential center of the magnet holding portion 31. The first imaginary line Ld is provided for each magnetic pole portion 10P. When viewed in the axial direction, the first imaginary line Ld passes on the d-axis of the rotor 10. The direction in which the first imaginary line Ld extends is the d-axis direction of the rotor 10. When viewed in the axial direction, the magnet hole 51a and the magnet hole 51b are arranged line-symmetrically with the first imaginary line Ld as the axis of symmetry.

[0044] When viewed in the axial direction, the pair of magnet holes 51a and 51b extend in a direction that separates from each other in the circumferential direction from the radial inside to the radial outside. That is, the circumferential distance between the magnet holes 51a and the magnet holes 51b increases from the radial inside to the radial outside. When viewed in the axial direction, the pair of magnet holes 51a and 51b are arranged in a V-shape that expands in the circumferential direction as they go toward the radial outside.

[0045] The magnet hole 51a has a magnet receiving hole portion 51c, an inner hole portion 51d, and an outer hole portion 51e. The magnet receiving hole portion 51c is a rectangular hole that is longer in the direction in which the magnet hole 51a extends when viewed in the axial direction. When viewed in the axial direction, the inner hole portion 51d is connected to the radially inner end of the end of the magnet receiving hole portion 51c in the direction in which the magnet receiving hole portion 51c extends. When viewed in the axial direction, the outer hole portion 51e is connected to the radially outer end of the end of the magnet receiving hole portion 51c in the direction in which the magnet receiving hole portion 51c extends.

[0046] The magnet hole 51b has a magnet receiving hole portion 51f, an inner hole portion 51g, and an outer hole portion 51h. The magnet receiving hole portion 51f is a rectangular hole that is longer in the direction in which the magnet hole 51b extends when viewed in the axial direction. When viewed in the axial direction, the inner hole portion 51g is connected to the radially inner end of the end of the magnet receiving hole portion 51f in the direction in which the magnet receiving hole portion 51f extends. When viewed in the axial direction, the outer hole portion 51h is connected to the radially outer end of the end of the magnet receiving hole portion 51f in the direction in which the magnet receiving hole portion 51f extends.

[0047] The inner hole portion 51d and the inner hole portion 51g are arranged at intervals in the circumferential direction across the first imaginary line Ld. When viewed in the axial direction, the edge of each of the inner hole portion 51d and the inner hole portion 51g on one side close to the other inner hole portion extends linearly along the first imaginary line Ld.

[0048] When viewed in the axial direction, a pair of magnets 41a, 41b arranged in a pair of magnet holes 51a, 51b are arranged along a V-shape that expands in the circumferential direction as it moves toward the radial outer side. Magnet 41a is arranged in the magnet receiving hole portion 51c of magnet hole 51a. Magnet 41b is arranged in the magnet receiving hole portion 51f of magnet hole 51b. The inner hole portions 51d, 51g and the outer hole portions 51e, 51h are, for example, hollow portions, and each constitutes a magnetic flux barrier. In addition, the inner hole portions 51d, 51g and the outer hole portions 51e, 51h may be filled with a non-magnetic body such as a resin, and the magnetic flux barrier may be constituted by each hole portion and a non-magnetic body such as a resin filled in each hole portion. In addition, in this specification, a "magnetic flux barrier" refers to a portion that can suppress the flow of magnetic flux. That is, it is not easy for magnetic flux to pass through each magnetic flux barrier.

[0049] In addition, in this specification, the "direction in which the magnet hole extends when viewed in the axial direction" refers to the direction in which the long side of the magnet receiving hole portion in the rectangular shape when viewed in the axial direction extends, for example, when the magnet receiving hole portion that receives the magnet is in a rectangular shape when viewed in the axial direction, such as the magnet holes 51a and 51b in this embodiment. That is, for example, in this embodiment, the "direction in which the magnet hole 51a extends when viewed in the axial direction" refers to the direction in which the long side of the magnet receiving hole portion 51c in the rectangular shape when viewed in the axial direction extends.

[0050] The rotor core 30 has a vent hole 80 that penetrates the rotor core 30 in the axial direction. In the present embodiment, when viewed in the axial direction, the vent hole 80 is arranged at a position overlapping with the second imaginary line Lq, which passes through the circumferential center between the magnet holding portions 31 adjacent in the circumferential direction and extends in the radial direction. When viewed in the axial direction, the second imaginary line Lq passes on the q-axis of the rotor 10. The direction in which the second imaginary line Lq extends is the q-axis direction of the rotor 10. The second imaginary line Lq is arranged between the magnet holding portions 31. The direction in which the first imaginary line Ld extends and the direction in which the second imaginary line Lq extends are directions that intersect with each other. The first imaginary line Ld and the second imaginary line Lq are alternately arranged in the circumferential direction.

[0051] like Figure 2 As shown, a plurality of vent holes 80 are provided at intervals along the circumferential direction. In the present embodiment, eight vent holes 80 are provided. Each vent hole 80 is disposed radially inwardly between adjacent magnet holding portions 31 along the circumferential direction. Figure 3 As shown, each of the air holes 80 is located radially inside the magnet hole 51 a of one magnet holding portion 31 and the magnet hole 51 b of the other magnet holding portion 31 of the magnet holding portions 31 adjacent to each other in the circumferential direction.

[0052] When viewed in the axial direction, the second imaginary line Lq passes through the circumferential center of the vent hole 80. In the present embodiment, when viewed in the axial direction, the vent hole 80 has a line symmetric shape with the second imaginary line Lq passing through the vent hole 80 as the axis of symmetry. The vent hole 80 has a first hole portion 81 and a second hole portion 82.

[0053] When viewed in the axial direction, the first hole portion 81 is a substantially pentagonal shape with rounded corners. When viewed in the axial direction, the first hole portion 81 is provided at a position overlapping with the second imaginary line Lq. In the present embodiment, when viewed in the axial direction, the first hole portion 81 is in a line-symmetrical shape with the second imaginary line Lq passing through the first hole portion 81 as a symmetry axis. The inner wall of the first hole portion 81 has a pair of first inner wall portions 81a, a pair of second inner wall portions 81b, and a third inner wall portion 81c.

[0054] When viewed in the axial direction, the pair of first inner wall portions 81a are arranged across the second imaginary line Lq in the circumferential direction. When viewed in the axial direction, the pair of first inner wall portions 81a extend in directions that separate from each other in the circumferential direction as they move radially inward. One of the pair of first inner wall portions 81a is located radially inward of the magnet hole 51a, and extends in a direction substantially the same as the direction in which the magnet hole 51a extends when viewed in the axial direction. The other of the pair of first inner wall portions 81a is located radially inward of the magnet hole 51b, and extends in a direction substantially the same as the direction in which the magnet hole 51b extends when viewed in the axial direction.

[0055] When viewed in the axial direction, the pair of second inner wall portions 81b extend radially inward from the radial inner end portions of the pair of first inner wall portions 81a, respectively. When viewed in the axial direction, the third inner wall portion 81c extends in an arc shape centered on the central axis J. The third inner wall portion 81c connects the radial inner end portions of the pair of second inner wall portions 81b to each other.

[0056] The second hole portion 82 is located radially outside the first hole portion 81. The second hole portion 82 is connected to the radially outer end of the first hole portion 81. When viewed in the axial direction, the second hole portion 82 is roughly circular. When viewed in the axial direction, the second hole portion 82 is arranged at a position overlapping with the second imaginary line Lq. When viewed in the axial direction, the second imaginary line Lq passes through the center of the second hole portion 82. When viewed in the axial direction, the second hole portion 82 has a shape that is line symmetrical with the second imaginary line Lq passing through the second hole portion 82 as the axis of symmetry. The second hole portion 82 is located circumferentially between the magnet hole 51a of one magnet holding portion 31 and the magnet hole 51b of the other magnet holding portion 31 of the circumferentially adjacent magnet holding portions 31. More specifically, the second hole portion 82 is located in the circumferential direction between the magnet receiving hole portion 51 c of one magnet holding portion 31 and the magnet receiving hole portion 51 f of the other magnet holding portion 31 of the magnet holding portions 31 adjacent to each other in the circumferential direction.

[0057] When viewed in the axial direction, the inner wall of the second hole portion 82 is in a C-shape that opens radially inward. When viewed in the axial direction, the two ends of the inner wall of the second hole portion 82 extending in a C-shape are respectively connected to the radially outer ends of a pair of first inner wall portions 81a. The circumferential dimension of the second hole portion 82 is smaller than the circumferential dimension of the first hole portion 81. In the present embodiment, the second hole portion 82 is equivalent to the "first rotation stop portion" provided in the rotor core 30. In the present embodiment, the second hole portion 82 is provided in all the vents 80, and therefore a plurality of second hole portions 82 serving as the first rotation stop portion are provided at intervals in the circumferential direction.

[0058] The circumferential dimension of the connecting portion 80a between the first hole portion 81 and the second hole portion 82 is smaller than the circumferential dimension of the first hole portion 81 and the circumferential dimension of the second hole portion 82. When viewed in the axial direction, the vent hole 80 is a shape that is narrowed in the circumferential direction at the connecting portion 80a between the first hole portion 81 and the second hole portion 82. A pair of protrusions 83a and 83b are provided on both sides of the circumferential direction of the connecting portion 80a. The pair of protrusions 83a and 83b are provided on the inner wall of the vent hole 80. The pair of protrusions 83a and 83b are arranged opposite to each other in the circumferential direction, and the protrusion toward the other side protrudes in the circumferential direction. The radially outer surfaces of the pair of protrusions 83a and 83b constitute a part of the inner surface of the second hole portion 82.

[0059] like Figure 1 As shown, the rotor 10 has a fan 90 arranged in a manner axially opposed to the rotor core 30. In the present embodiment, one fan 90 is respectively arranged on both axial sides of the rotor core 30. A pair of fans 90 are respectively arranged on the radial inner side of a pair of coil ends 61d and 61e. In the present embodiment, the pair of fans 90 are of the same shape as each other. A pair of fans 90 are installed on the axial end surface of the rotor core 30 in directions that are axially reversed to each other. The installation angles of the pair of fans 90 around the center axis J relative to the rotor core 30 are different. The material constituting the fan 90 is, for example, an aluminum alloy. The fan 90 is formed, for example, by die casting. In addition, the material constituting the fan 90 may be a metal other than an aluminum alloy, or may be a resin material.

[0060] In addition, in the following description, a pair of fans 90 is sometimes used as a representative and only the fan 90 located on the other axial side (-Y side) of the rotor core 30 is described. In addition, for a certain object, the side closer to the center of the rotor core 30 in the axial direction is referred to as the "axially inner side", and the side farther from the center of the rotor core 30 in the axial direction is referred to as the "axially outer side". In each fan 90, the side of the rotor core 30 relative to the fan 90 is the axially inner side, and the side of the rotor core 30 opposite to the side where the fan 90 is located is the axially outer side. For example, in the fan 90 located on the other axial side of the rotor core 30, the axially inner side is one axial side (+Y side), and the axially outer side is the other axial side (-Y side).

[0061] like Figure 4 and Figure 5 As shown, the fan 90 is an annular component surrounding the central axis J. More specifically, the fan 90 is an annular shape centered on the central axis J. The rotor shaft 20 passes through the radial inner side of the fan 90 in the axial direction. Figure 4 As shown in FIG. 1 , the fan 90 includes a fan body 91, ribs 93, and a flange 94. The fan body 91 is an annular portion surrounding the central axis J. Figure 1As shown, the axial inner surface of the fan body portion 91 is in contact with the axial end surface of the rotor core 30 .

[0062] like Figure 5 As shown, the fan body 91 has a first opening portion 95 and a second opening portion 96 which penetrate the fan body 91 in the axial direction. That is, the fan 90 has a first opening portion 95 and a second opening portion 96. The first opening portion 95 and the second opening portion 96 are opening portions which are arranged opposite to the vent hole 80. A plurality of the first opening portions 95 and a plurality of the second opening portions 96 are provided. In the present embodiment, four first opening portions 95 and four second opening portions 96 are provided respectively. The first opening portion 95 and the second opening portion 96 are alternately provided in the circumferential direction. In the present embodiment, when viewed in the axial direction, the first opening portion 95 and the second opening portion 96 are in the shape of a roughly circular arc extending in the circumferential direction.

[0063] like Figure 1 As shown, the first opening 95 and the second opening 96 are respectively arranged in a manner opposite to the vent hole 80 in the axial direction, and are connected to the vent hole 80. The end of the vent hole 80 on one axial side (+Y side) is connected to one of the first opening 95 and the second opening 96 of the fan 90 located on one axial side. The end of the vent hole 80 on the other axial side (-Y side) is connected to the other of the first opening 95 and the second opening 96 of the fan 90 located on the other axial side. That is, one of the two axial ends of the vent hole 80 is connected to the first opening 95, and the other of the two axial ends of the vent hole 80 is connected to the second opening 96.

[0064] The plurality of vent holes 80 include vent holes 80 whose ends on one axial side (+Y side) are connected to the first opening 95 and whose ends on the other axial side (-Y side) are connected to the second opening 96, and vent holes 80 whose ends on one axial side are connected to the second opening 96 and whose ends on the other axial side are connected to the first opening 95. The vent holes 80 whose ends on one axial side are connected to the first opening 95 and whose ends on the other axial side are connected to the second opening 96 and whose ends on one axial side are connected to the first opening 95 are alternately arranged in the circumferential direction.

[0065] The fan 90 rotates around the central axis J, and air is sucked into the first opening 95 from the axially outer side, and air is blown out from the second opening 96 to the axially outer side. That is, when the fan 90 rotates around the central axis J, air flows into the vent hole 80 from the axial end portion on the side connected to the first opening 95, and the inflowing air flows in the vent hole 80 in the axial direction toward the second opening 96. In the vent holes 80 adjacent to each other in the circumferential direction, the directions of the air flowing in the vent holes 80 are opposite to each other.

[0066] like Figure 4As shown in the figure, the ribs 93 are respectively arranged between the first opening 95 and the second opening 96 adjacent to each other in the circumferential direction. The ribs 93 protrude axially outward from the fan body 91. The ribs 93 extend radially. By arranging the ribs 93 between the first opening 95 and the second opening 96, it is possible to suppress the flow of air sucked into the first opening 95 from interfering with the flow of air blown out from the second opening 96.

[0067] The flange 94 is arranged opposite to the axial outer side (-Y side) of the radial inner part of the second opening 96. The flange 94 extends in the circumferential direction. The flange 94 connects the ribs 93 located on both sides of the circumferential direction of the second opening 96 to each other in the circumferential direction. By providing the flange 94, the air blown out from the second opening 96 is guided radially outward by centrifugal force. Thus, the air blown out from the second opening 96 can contact the coil ends 61d, 61e located radially outward of the fan 90. In addition, when the fan 90 rotates, air can be blown out from the second opening 96 appropriately, so that negative pressure can be easily generated inside the part of the side connected to the second opening 96 in the vent 80. Thus, air can be easily sucked into the vent 80 via the first opening 95. Therefore, it is easy to circulate air appropriately in the vent 80.

[0068] The air blown out from the second opening 96 of the fan 90 on one axial side (+Y side) contacts the coil end 61d and is then sucked into the first opening 95 of the fan 90 on one axial side. The air sucked into the first opening 95 of the fan 90 on one axial side flows toward the other axial side (-Y side) in the vent 80 and is blown out from the second opening 96 of the fan 90 on the other axial side. The air blown out from the second opening 96 of the fan 90 on the other axial side contacts the coil end 61e and is then sucked into the first opening 95 of the fan 90 on the other axial side. The air sucked into the first opening 95 of the fan 90 on the other axial side flows toward one axial side in the vent 80 and is blown out from the second opening 96 of the fan 90 on the one axial side. In this way, the fan 90 rotates as the rotor 10 rotates, so that the air in the motor housing 63a circulates, and the rotor 10 and the stator 61 can be cooled.

[0069] like Figure 5 As shown, the fan 90 is provided with a second stopper 92. In the present embodiment, the second stopper 92 is in the shape of a column that protrudes axially inward (+Y side) from the fan body 91. That is, the second stopper 92 protrudes axially toward the rotor core 30. In the present embodiment, the second stopper 92 is in the shape of a cylinder that extends axially. The second stopper 92 protrudes axially inward from the circumferential center of the radially outer portion of the inner edge of the first opening 95.

[0070] like Figure 2As shown, the second rotation stopper 92 is inserted into the second hole portion 82 of the vent hole 80. The second rotation stopper 92 is fitted into the second hole portion 82 and contacts the inner peripheral surface of the second hole portion 82 in the circumferential direction. Thus, in the present embodiment, the second hole portion 82 is the first rotation stopper for the second rotation stopper 92 to contact in the circumferential direction. That is, in the present embodiment, the second rotation stopper 92 is provided on the fan 90 to contact in the circumferential direction with the second hole portion 82 as the first rotation stopper. Therefore, the second hole portion 82 as the first rotation stopper and the second rotation stopper 92 suppress the relative rotation of the fan 90 and the rotor core 30 in the circumferential direction. Thus, compared with the case where the fan 90 is fixed to the rotor shaft 20, the relative position accuracy of the fan 90 in the circumferential direction with respect to the rotor core 30 can be improved. Therefore, the first opening portion 95 and the second opening portion 96 of the fan 90 can be appropriately suppressed from being offset in the circumferential direction with respect to the vent hole 80 of the rotor core 30. Therefore, air can be easily and appropriately flowed through the vent hole 80 via the first opening 95 and the second opening 96, and the air blowing efficiency of the fan 90 can be improved. Thus, the rotor 10 and the stator 61 can be appropriately cooled by the air sent by the fan 90.

[0071] In addition, when the fan 90 is mounted on the rotor shaft 20 while preventing the fan 90 from rotating relative to the rotor shaft 20, it is considered to provide a groove on one of the rotor shaft 20 and the fan 90, and to provide a protrusion that fits into the groove on the other of the rotor shaft 20 and the fan 90. However, in this case, the rotor shaft 20 needs to be additionally processed, which increases the manufacturing cost of the rotor 10. In contrast, according to the present embodiment, a structure is adopted in which the fan 90 is mounted on the rotor core 30 while preventing the fan 90 from rotating relative to the rotor core 30 rather than relative to the rotor shaft 20, so it is not necessary to perform additional processing on the rotor shaft 20 for mounting the fan 90. In addition, the rotor core 30 is manufactured by stacking a plurality of plate members punched out from a base material, so the first rotation stopper can be easily provided on the rotor core 30 by changing the shape of the punched plate member. That is, by simply changing the shape of the die for punching the plate member, the first rotation stopper can be provided on the rotor core 30 manufactured by stacking the plate members without performing additional processing. This can suppress an increase in man-hours when manufacturing the rotor 10 , and suppress an increase in the manufacturing cost of the rotor 10 .

[0072] In the present embodiment, the first stopper is a hole formed by a portion of the vent hole 80, and the second stopper 92 protrudes axially toward the rotor core 30 and is inserted into the vent hole 80 serving as the first stopper. Therefore, a portion of the vent hole 80 can be used as the first stopper that contacts the second stopper 92 in the circumferential direction. Thus, there is no need to provide a hole serving as the first stopper for inserting the second stopper 92 in addition to the vent hole 80, and the rotor core 30 can be easily manufactured. In addition, the number of holes provided in the rotor core 30 can be suppressed from increasing, and the strength of the rotor core 30 can be suppressed from decreasing. In addition, the first stopper is provided in the portion where the magnetic flux flowing in the rotor core 30 is easily suppressed, so that the magnetic flux can be easily and appropriately circulated in the rotor core 30.

[0073] In addition, in the present embodiment, the second hole portion 82 serving as the first rotation stop portion is the radially outer end portion of the vent hole 80. That is, in the present embodiment, the first rotation stop portion is constituted by the radially outer end portion of the vent hole 80. Therefore, a portion of the vent hole 80 can be used as the first rotation stop portion, and the radial positions of the first rotation stop portion and the second rotation stop portion 92 can be made closer to the radial outer side. Thus, the rotor core 30 can support the fan 90 in the circumferential direction at a position relatively closer to the radial outer side. Therefore, the fan 90 can be stably mounted on the rotor core 30 while preventing the fan 90 from rotating relative to the rotor core 30.

[0074] In addition, in the present embodiment, the protrusions 83a and 83b are provided on the inner wall of the vent hole 80 provided with the second hole portion 82 as the first rotation stopper. The protrusions 83a and 83b constitute a part of the inner surface of the second hole portion 82 as the first rotation stopper. In this way, by providing the protrusions 83a and 83b on the inner wall of the vent hole 80, a part of the vent hole 80 can be easily divided to form the first rotation stopper.

[0075] In addition, if Figure 2 As shown, in the present embodiment, the second hole portion 82 as the first rotation stop portion is respectively provided in a plurality of vent holes 80. Therefore, for example, compared with the case where the second hole portion 82 is provided only in a part of the vent holes 80, it is possible to suppress the flow of magnetic flux around each vent hole 80 from being deviated. Thus, it is possible to appropriately suppress the circumferential magnetic characteristics of the rotor 10 from being deviated. In addition, since the second hole portion 82 is provided in each vent hole 80, it is possible to select which second hole portion 82 the second rotation stop portion 92 is to be inserted into according to the circumferential angle at which the fan 90 is installed in the rotor core 30. Thus, even in the case where a pair of fans 90 are provided and the pair of fans 90 are installed in the rotor core 30 at different circumferential installation angles, as in the present embodiment, each second rotation stop portion 92 of each fan 90 can be appropriately inserted into the second hole portion 82 as the first rotation stop portion provided in the rotor core 30.

[0076] In addition, in the present embodiment, when viewed in the axial direction, the second hole portion 82 as the first rotation stop portion is provided at a position overlapping with the second imaginary line Lq, which passes through the circumferential center of the magnet holding portions 31 adjacent to each other in the circumferential direction and extends in the radial direction. Therefore, compared with the case where the first rotation stop portion is provided in the magnet holding portion 31, it is possible to suppress the first rotation stop portion from interfering with the magnet holes 51a, 51b and the magnets 41a, 41b provided in the magnet holding portion 31.

[0077] like Figure 1 As shown, the axial dimension of the second stopper 92 is smaller than the axial dimension of the core member 30p. Therefore, the second stopper 92 inserted into the second hole portion 82 is not arranged across the portions of the second hole portion 82 respectively provided in the two core members 30p. Thus, even in the case where the core members 30p are arranged circumferentially staggered from each other in order to provide segmented skew poles on the rotor 10, it is not necessary to insert the second stopper 92 into the portions of the second hole portion 82 that are arranged circumferentially staggered. Therefore, even in the case where the core members 30p are arranged circumferentially staggered from each other, the second stopper 92 can be easily inserted into the second hole portion 82.

[0078] In the present embodiment, the second rotation stopper 92 is fitted into the second hole portion 82 as the first rotation stopper. Therefore, the second rotation stopper 92 and the second hole portion 82 can be appropriately contacted in the circumferential direction, and the fan 90 can be more stably mounted on the rotor core 30 while preventing the fan 90 from rotating relative to the rotor core 30.

[0079] like Figure 2 and Figure 5 As shown, a plurality of second stop portions 92 are provided at intervals along the circumferential direction. Therefore, the fan 90 can be mounted on the rotor core 30 more stably while preventing the fan 90 from rotating relative to the rotor core 30 by utilizing a plurality of second stop portions 92. In the present embodiment, the number of second stop portions 92 is less than the number of second hole portions 82 serving as the first stop portions. Therefore, even in the case where the second hole portion 82 and the second stop portion 92 are slightly offset due to tolerances, etc., it is easier to insert a plurality of second stop portions 92 into the second hole portions 82, respectively, compared to the case where the second stop portions 92 need to be inserted into all the second hole portions 82.

[0080] In the present embodiment, a pair of second rotation stoppers 92 are provided in a manner that they are spaced apart from the central axis J in the radial direction. The pair of second rotation stoppers 92 is inserted into each second hole portion 82 of a pair of vent holes 80 that are arranged in the radial direction spaced apart from the central axis J. By making the number of the second rotation stoppers 92 two, even if the second hole portion 82 and the second rotation stoppers 92 are slightly offset due to tolerance or the like, it is easy to absorb the offset by utilizing a small gap between one of the second rotation stoppers 92 and the second hole portion 82, and the two second rotation stoppers 92 can be appropriately inserted into each second hole portion 82.

[0081] like Figure 4 As shown, in this embodiment, the rotor 10 has an anti-slip component 23. The anti-slip component 23 is in a ring shape surrounding the central axis J. More specifically, the anti-slip component 23 is in a circular ring shape centered on the central axis J. The anti-slip component 23 is fixed to the outer peripheral surface of the rotor shaft 20. The rotor shaft 20 is pressed into the inner side of the anti-slip component 23.

[0082] like Figure 1 As shown, in the present embodiment, a pair of anti-slip components 23 are arranged at intervals in the axial direction. A pair of anti-slip components 23 are arranged in the axial direction across the rotor core 30 and a pair of fans 90, and the pair of fans 90 are arranged in the axial direction across the rotor core 30. The fan 90 located in the axial direction is sandwiched between the anti-slip component 23 located on one side of the axial direction (+Y side) and the axial direction of the rotor core 30. The fan 90 located in the axial direction is sandwiched between the anti-slip component 23 located on the other side of the axial direction (-Y side) and the axial direction of the rotor core 30. That is, each fan 90 is located between the rotor core 30 and the anti-slip component 23 in the axial direction. Therefore, the anti-slip component 23 can be used to suppress the fan 90 from moving in the axial direction away from the rotor core 30. Thus, the fan 90 can be appropriately positioned in the axial direction relative to the rotor core 30. The axial inner surface of the anti-slip component 23 contacts the fan 90.

[0083] Hereinafter, an embodiment different from the first embodiment described above will be described. In the description of each of the following embodiments, for the same structure as the first embodiment described above, the description is sometimes omitted by appropriately marking the same reference numerals, etc. Furthermore, as a structure whose description is omitted in each of the following embodiments, the same structure as the first embodiment described above can be adopted within the scope of no contradiction.

[0084] <Second embodiment>

[0085] like Figure 6As shown, in the rotor 210 of the present embodiment, the vent hole 280 of the rotor core 230 is different from the vent hole 80 of the first embodiment, and does not have the second hole portion 82, but is composed of only the first hole portion 281. When viewed in the axial direction, the first hole portion 281 has a shape substantially the same as the first hole portion 81 of the first embodiment. The inner wall of the first hole portion 281 has a pair of first inner wall portions 81a, a pair of second inner wall portions 81b, and a third inner wall portion 81c, similarly to the inner wall of the first hole portion 81 of the first embodiment. In the first hole portion 281 of the present embodiment, the pair of first inner wall portions 81a are connected to each other at the radially outer ends.

[0086] A pair of protrusions 283a and 283b are provided on the inner wall of the vent hole 280. The pair of protrusions 283a and 283b are respectively provided on the radially outer portions of the pair of first inner wall portions 81a of the first hole portion 281. The pair of protrusions 283a and 283b are arranged to face each other in the circumferential direction, and the protrusions toward the other protrude in the circumferential direction. A gap is provided between the pair of protrusions 283a and 283b.

[0087] The radially outer end of the first hole portion 281 is formed into a first rotation stop 281d which is separated from the other parts of the vent 280 by a pair of protrusions 283a and 283b. When viewed in the axial direction, the first rotation stop 281d is roughly rhombus-shaped. The second rotation stop 292 of the fan 290 is inserted into the first rotation stop 281d. The second rotation stop 292 is the same as the second rotation stop 92 of the first embodiment except that the radial position is different. The protrusions 283a and 283b constitute a part of the inner surface of the first rotation stop 281d. In this embodiment, the radially outer surfaces of the protrusions 283a and 283b constitute the radially inner inner surface of the first rotation stop 281d. In this way, by providing the protrusions 283a and 283b on the inner wall of the vent 280 to divide a part of the vent 280, the first rotation stop 281d can be easily manufactured.

[0088] <Third embodiment>

[0089] like Figure 7 As shown in FIG. 1 , in the rotor 310 of the present embodiment, the vent hole 380 of the rotor core 330 is constituted by only the first hole portion 381. The first hole portion 381 has the same shape as the first hole portion 281 of the second embodiment except that the protrusions 283a and 283b are not provided on the inner wall. In the present embodiment, the radially inner portion of the first hole portion 381 is a first rotation stopper 381d.

[0090] In the present embodiment, the second rotation-stopping portion 392 of the fan 390 has a pair of column portions 392a arranged at intervals in the circumferential direction. The pair of column portions 392a extends in the axial direction. When viewed in the axial direction, the pair of column portions 392a is in a substantially rectangular shape extending in the radial direction. The pair of column portions 392a is inserted into the first rotation-stopping portion 381d. The portion of the inner surface of the pair of column portions 392a and the first rotation-stopping portion 381d located on both sides of the circumferential direction is respectively arranged opposite to each other in the circumferential direction. Therefore, the second rotation-stopping portion 392 can be stably contacted with the first rotation-stopping portion 381d in the circumferential direction via the pair of column portions 392a. Thus, the fan 390 can be stably mounted on the rotor core 330 while preventing the fan 390 from rotating relative to the rotor core 330. In the present embodiment, the pair of column portions 392a and the pair of second inner wall portions 81b are respectively opposite to each other in the circumferential direction. The pair of column portions 392a and the pair of second inner wall portions 81b are in contact with each other in the circumferential direction.

[0091] <Fourth embodiment>

[0092] like Figure 8 As shown, in the rotor 410 of this embodiment, the shape of the rotor core 430 is the same as the shape of the rotor core 330 of the third embodiment. In the rotor core 430 of this embodiment, the radially outer end of the first hole portion 381 of the vent hole 380 is the first rotation stopper 481d.

[0093] In the present embodiment, the second rotation stopper 492 of the fan 490 is in the shape of a roughly triangular prism extending in the axial direction. The second rotation stopper 492 is inserted into the first rotation stopper 481d. The second rotation stopper 492 is located between the radially outer ends of the pair of first inner wall portions 81a. The second rotation stopper 492 is in contact with the pair of first inner wall portions 81a in the circumferential direction. The second rotation stopper 492 is in contact with the connection portion between the pair of first inner wall portions 81a from the radially inner side.

[0094] <Fifth embodiment>

[0095] like Fig. 9 As shown, in the rotor 510 of the present embodiment, the rotor core 530 has a hole portion 580 opening on the axial end surface of the rotor core 530. The hole portion 580 may be a hole that penetrates the rotor core 530 in the axial direction, or may be a hole that has a bottom at the axial end. When viewed in the axial direction, the hole portion 580 is generally circular. The second rotation-stopping portion 592 of the fan 590 of the present embodiment protrudes axially toward the rotor core 530 and is inserted into the hole portion 580 that serves as the first rotation-stopping portion. The second rotation-stopping portion 592 is the same as the second rotation-stopping portion 92 of the first embodiment except that the position is different.

[0096] The hole portion 580 is arranged at a position different from the vent hole 380. In the present embodiment, the first rotation stopper is formed by the hole portion 580. Therefore, by providing the hole portion 580 in addition to the vent hole 380, the first rotation stopper can be provided regardless of the position of the vent hole 380. Thus, the degree of freedom in configuring the first rotation stopper can be increased. The vent hole 380 of the present embodiment is not provided with the first rotation stopper.

[0097] In the present embodiment, the hole portion 580 as the first rotation stop portion is provided in the magnet holding portion 531. In the present embodiment, the hole portion 580 as the first rotation stop portion is located between the pair of magnet holes 51a and 51b in the circumferential direction. By arranging the hole portion 580 at such a position, it is possible to suppress the magnetic flux flowing in the rotor core 530 from being blocked by the hole portion 580. When viewed in the axial direction, the hole portion 580 as the first rotation stop portion is provided at a position overlapping with the first imaginary line Ld. By arranging the hole portion 580 at such a position, it is possible to further suppress the magnetic flux flowing in the rotor core 530 from being blocked by the hole portion 580. When viewed in the axial direction, the center of the hole portion 580 overlaps with the first imaginary line Ld.

[0098] The hole 580 as the first rotation-stopping portion is provided at the radial outer edge of the rotor core 530. Therefore, the rotor core 530 can more appropriately support the fan 590 in the circumferential direction at the radial outer side, and the fan 590 can be more stably mounted on the rotor core 530 while preventing the fan 590 from rotating relative to the rotor core 530.

[0099] The position of the hole 580 as the first rotation stopper is not particularly limited as long as it is different from the vent hole 380. The hole 580 may also be provided at Fig. 9 The position of the hole portion 680 is shown by the double-dotted line in the figure. When viewed in the axial direction, the hole portion 680 is arranged at a position overlapping with the second imaginary line Lq. When viewed in the axial direction, the center of the circular hole portion 680 overlaps with the second imaginary line Lq. The hole portion 680 is arranged at the radial outer edge of the rotor core 530. The hole portion 680 is located between the outer hole portion 51e of the magnet hole 51a of one of the magnet holding portions 531 adjacent to each other in the circumferential direction and the outer hole portion 51h of the magnet hole 51b of the other magnet holding portion 531. The hole portion 680 is arranged at intervals on the radial outer side of the vent hole 380.

[0100] The present invention is not limited to the above-mentioned embodiments, and other structures and other methods can be adopted within the scope of the technical idea of ​​the present invention. The first stopper can be of any structure as long as it is arranged on the rotor core and is in contact with the second stopper in the circumferential direction. The second stopper can be of any structure as long as it is arranged on the fan and is in contact with the first stopper in the circumferential direction. Alternatively, the second stopper is a hole portion arranged in the fan, and the first stopper protrudes axially toward the fan and is inserted into the hole portion. The number of the first stopper and the number of the second stopper can be no particular limitation as long as they are each at least one. The number of the first stopper and the number of the second stopper can also be the same as each other.

[0101] The position of the second anti-rotation portion on the fan is not particularly limited. For example, in the first embodiment described above, the second anti-rotation portion 92 may protrude axially from the inner edge of the second opening portion 96, or may protrude axially from a portion of the fan body portion 91 other than the first opening portion 95 and the second opening portion 96.

[0102] The fan may have any structure as long as it has an opening disposed opposite to the vent hole and is provided with a second anti-rotation portion. The fan may be provided with only one fan. The fan may be positioned in any axial direction relative to the rotor core.

[0103] In the rotor core, the magnet holes can be arranged arbitrarily. In addition to the pair of magnet holes in the above-mentioned embodiment, the rotor core can also have other magnet holes located radially outside the pair of magnet holes. The other magnet holes can be a pair of magnet holes arranged along a V-shape when viewed in the axial direction, similarly to the pair of magnet holes in the above-mentioned embodiment, or can be magnet holes extending in a direction perpendicular to the radial direction. In the case where the other magnet holes are magnet holes extending in a direction perpendicular to the radial direction, the pair of magnet holes in the above-mentioned embodiment and the other magnet holes can be arranged along a ▽ shape when viewed in the axial direction.

[0104] The rotary electric machine to which the present invention is applied is not limited to a motor, but may also be a generator. The purpose of the rotary electric machine is not particularly limited. The rotary electric machine may also be mounted on equipment other than a vehicle. The purpose of the drive device to which the present invention is applied is not particularly limited. The drive device may, for example, be mounted on a vehicle for purposes other than rotating an axle, or may be mounted on equipment other than a vehicle. The posture when using the rotary electric machine and the drive device is not particularly limited. The central axis of the rotary electric machine may also be inclined relative to a horizontal direction perpendicular to the vertical direction, or may extend in the vertical direction.

[0105] In addition, the present technology can adopt the following structures.

[0106] (1) A rotor capable of rotating around a central axis, wherein the rotor comprises: a rotor core; and a fan arranged in an axially opposite manner to the rotor core, the rotor core having an air vent extending axially through the rotor core, the fan having an opening arranged opposite to the air vent, a first stop portion being provided on the rotor core, and a second stop portion being provided on the fan and contacting the first stop portion in a circumferential direction.

[0107] (2) The rotor according to (1), wherein the first rotation-stopping portion is a hole formed by a portion of the vent hole, and the second rotation-stopping portion protrudes axially toward the rotor core and is inserted into the first rotation-stopping portion.

[0108] (3) The rotor according to (2), wherein the first rotation-stopping portion is formed by a radially outer end portion of the vent hole.

[0109] (4) The rotor according to (2) or (3), wherein a protrusion is provided on the inner wall of the vent hole in which the first rotation-stopping portion is provided, and the protrusion constitutes a part of the inner surface of the first rotation-stopping portion.

[0110] (5) A rotor according to any one of (2) to (4), wherein the second detent portion has a pair of column portions arranged at intervals along the circumferential direction, and the pair of column portions are arranged in a manner opposite to the portions of the inner surface of the first detent portion located on both sides of the circumferential direction.

[0111] (6) The rotor according to any one of (2) to (5), wherein a plurality of the ventilation holes are provided at intervals in the circumferential direction, and the first rotation-stopping portion is provided in each of the plurality of ventilation holes.

[0112] (7) A rotor according to (1), wherein the rotor core has a hole portion opening on an axial end face of the rotor core, the hole portion is arranged at a position different from the air vent, the first stop portion is formed by the hole portion, and the second stop portion protrudes axially toward the rotor core and is inserted into the first stop portion.

[0113] (8) A rotor according to (7), wherein the rotor core has a pair of magnet holes adjacent to each other in the circumferential direction, and when viewed in the axial direction, the pair of magnet holes extend in a direction separating from each other in the circumferential direction as they go from the radial inside to the radial outside, and the first stop portion is located between the pair of magnet holes in the circumferential direction.

[0114] (9) The rotor according to (8), wherein, when viewed in the axial direction, the first anti-rotation portion is provided at a position overlapping with a first imaginary line that passes through the circumferential center between the pair of magnet holes and extends in the radial direction.

[0115] (10) A rotor according to any one of (2) to (9), wherein the rotor core has a plurality of magnet retaining portions arranged in a circumferential direction, and when viewed in the axial direction, the first anti-rotation portion is arranged at a position overlapping with a second imaginary line, and the second imaginary line passes through the circumferential centers of the magnet retaining portions adjacent to each other in the circumferential direction and extends radially.

[0116] (11) The rotor according to any one of (2) to (10), wherein the first rotation-stopping portion is provided at a radially outer edge portion of the rotor core.

[0117] (12) A rotor according to any one of (2) to (11), wherein the rotor core has a plurality of core pieces arranged in an axial direction, and the axial dimension of the second detent portion is smaller than the axial dimension of the core pieces.

[0118] (13) The rotor according to any one of (2) to (12), wherein the second rotation-stopping portion is fitted into the first rotation-stopping portion.

[0119] (14) A rotor according to any one of (1) to (13), wherein a plurality of the first stop parts are arranged at intervals along the circumferential direction, and a plurality of the second stop parts are arranged at intervals along the circumferential direction, and the number of the second stop parts is less than the number of the first stop parts.

[0120] (15) A rotor according to any one of (1) to (14), wherein the rotor comprises: a rotor shaft extending along the central axis; and an anti-slip component fixed to the outer peripheral surface of the rotor shaft, the rotor core fixed to the outer peripheral surface of the rotor shaft, and the fan is located axially between the rotor core and the anti-slip component.

[0121] (16) A rotating electrical machine comprising: a rotor as described in any one of (1) to (15); and a stator facing the rotor with a gap therebetween in a radial direction.

[0122] (17) A drive device comprising: the rotating electrical machine described in (16); and a power transmission unit that transmits power of the rotating electrical machine.

[0123] The configurations described above in this specification can be appropriately combined within a range that does not contradict each other.

[0124] Description of symbols

[0125] 10, 210, 310, 410, 510: rotor; 20: rotor shaft; 23: anti-dropping member; 30, 230, 330, 430, 530: rotor core; 30p: core member; 31, 531: magnet holding portion; 40, 41a, 41b: magnet; 51a, 51b: magnet hole; 60: rotating motor; 61: stator; 70: power transmission portion; 80, 280, 380: vent hole; 82: second hole portion (first anti-rotation portion); 83a, 283a: protrusion; 90, 290, 390, 490, 590: fan; 92, 292, 392, 492, 592: second anti-rotation portion; 95: first opening portion (opening portion); 96: second opening portion (opening portion); 100: driving device; 281d, 381d, 481d: first anti-rotation portion; 392a: column portion; 580, 680: hole portion (first anti-rotation portion); J: center axis; Ld: first imaginary line; Lq: second imaginary line.

Claims

1. A rotor capable of rotating about a central axis, wherein: The rotor has: a rotor core; and a fan arranged to be axially opposed to the rotor core; The rotor core has a vent hole that penetrates the rotor core in the axial direction. The fan has an opening portion arranged opposite to the vent hole. A first anti-rotation portion is provided on the rotor core. The fan is provided with a second rotation-stopping portion that contacts the first rotation-stopping portion in a circumferential direction.

2. The rotor according to claim 1, wherein: The first anti-rotation portion is a hole formed by a portion of the vent hole. The second rotation-stopping portion protrudes in the axial direction toward the rotor core and is inserted into the first rotation-stopping portion.

3. The rotor according to claim 2, wherein: The first rotation-stopping portion is formed by a radially outer end portion of the vent hole.

4. The rotor according to claim 2, wherein: A protrusion is provided on the inner wall of the vent hole provided with the first anti-rotation portion, The protrusion constitutes a part of the inner surface of the first rotation-stopping portion.

5. The rotor according to claim 2, wherein: The second anti-rotation portion includes a pair of column portions arranged at intervals in the circumferential direction. The pair of column portions are arranged so as to face portions located on both sides in the circumferential direction of the inner surface of the first rotation-stopping portion, respectively.

6. The rotor according to claim 2, wherein: The vent holes are arranged in a plurality at intervals along the circumferential direction. The first anti-rotation portion is respectively provided at the plurality of ventilation holes.

7. The rotor according to claim 1, wherein: The rotor core has a hole portion opened at an axial end surface of the rotor core. The hole portion is arranged at a position different from the vent hole, The first anti-rotation portion is formed by the hole portion, The second rotation-stopping portion protrudes in the axial direction toward the rotor core and is inserted into the first rotation-stopping portion.

8. The rotor according to claim 7, wherein: The rotor core has a pair of magnet holes adjacent to each other in the circumferential direction. When viewed in the axial direction, the pair of magnet holes extend in a direction that separates from each other in the circumferential direction as they go from the radial inner side toward the radial outer side. The first rotation-stopping portion is located between the pair of magnet holes in the circumferential direction.

9. The rotor according to claim 8, wherein: When viewed in the axial direction, the first rotation-stopping portion is provided at a position overlapping with a first imaginary line that passes through a circumferential center between the pair of magnet holes and extends in the radial direction.

10. The rotor according to claim 7, wherein: The rotor core has a plurality of magnet holding portions arranged in a circumferential direction. When viewed in the axial direction, the first rotation-stopping portion is provided at a position overlapping with a second imaginary line that passes through the circumferential center between the magnet holding portions adjacent to each other in the circumferential direction and extends in the radial direction.

11. The rotor according to claim 7, wherein: The first rotation-stopping portion is provided at a radially outer edge portion of the rotor core.

12. The rotor according to claim 2, wherein: The rotor core has a plurality of core pieces arranged in an axial direction. The axial dimension of the second rotation-stopping portion is smaller than the axial dimension of the core member.

13. The rotor according to claim 2, wherein: The second rotation-stopping portion is fitted into the first rotation-stopping portion.

14. The rotor according to claim 1, wherein: The first anti-rotation portion is provided in plurality at intervals along the circumferential direction. The second anti-rotation portion is provided in plurality at intervals along the circumferential direction. The number of the second anti-rotation parts is smaller than the number of the first anti-rotation parts.

15. The rotor according to claim 1, wherein: The rotor has: a rotor shaft extending along the central axis; and an anti-slip component fixed to the outer peripheral surface of the rotor shaft, The rotor core is fixed to the outer peripheral surface of the rotor shaft. The fan is located between the rotor core and the anti-dropping component in the axial direction.

16. A rotating electrical machine, comprising: A rotor as claimed in any one of claims 1 to 15; and The stator faces the rotor with a gap therebetween in the radial direction.

17. A driving device, comprising: The rotating electrical machine according to claim 16; and A power transmission unit transmits power of the rotating electric machine.

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