STATOR, ROTATING ELECTRIC MACHINE, DRIVE DEVICE, AND MOBILE BODY

Abstract

To provide a stator having structure capable of suppressing that a stator core deforms, a rotary electric machine, a drive unit, and a mobile object.SOLUTION: One aspect of a stator comprises a stator core 41 having an annular core back 43a surrounding a center shaft J and a plurality of teeth 43b extending radially inside from the core back 43a. The stator core 41 comprises: a hole part 49a provided at a radially outside part of the stator core 41 to extend in an axial direction; and a weld zone 80 provided on a radially outside surface of the stator core 41. The weld zone 80 comprises a first weld zone 81 provided on a virtual line connecting the hole part 49a with the center shaft J by being viewed in an axial direction of the radially outside surface of the stator core 41.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a stator, a rotating electric machine, a drive device, and a moving body. [Background technology]

[0002] There is known a stator core that is fixed by a bolt inserted into a hole. For example, Patent Document 1 describes a stator core used in an in-vehicle motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-106813 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the stator core is fixed with bolts, a torsional force is applied to the stator core when the bolts are tightened. This can cause deformation of the stator core. In particular, when the stator core is made up of multiple laminated plate members, the plate members can be deformed.

[0005] In view of the above circumstances, an object of the present invention is to provide a stator, a rotating electric machine, a drive device, and a moving body having a structure capable of suppressing deformation of a stator core. [Means for solving the problem]

[0006] One embodiment of the stator of the present invention includes a stator core having an annular core back surrounding a central axis and a plurality of teeth extending radially inward from the core back. The stator core has a hole portion provided in a radially outer portion of the stator core and extending in the axial direction, and a weld portion provided on a radially outer surface of the stator core. The weld portion includes a first weld portion provided on a virtual line connecting the hole portion and the central axis as viewed in the axial direction on the radially outer surface of the stator core.

[0007] One aspect of a rotating electric machine of the present invention includes the above-mentioned stator, and a rotor facing the stator with a gap therebetween.

[0008] One aspect of the drive device of the present invention is a drive device mounted on a vehicle, and comprises the above-mentioned rotating electric machine and a transmission device connected to the rotating electric machine and transmitting the rotation of the rotating electric machine to an axle of the vehicle.

[0009] One aspect of a moving object of the present invention includes the rotating electric machine described above. Effect of the Invention

[0010] According to one aspect of the present invention, deformation of a stator core in a stator, a rotating electric machine, a drive device, and a moving body can be suppressed. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a moving body according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing a drive device according to an embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing a part of the drive device according to the embodiment, taken along line III-III in FIG. [Figure 4] FIG. 4 is a diagram of the stator and the coolant supply unit according to one embodiment, as viewed from above. [Diagram 5] FIG. 5 is a perspective view showing a stator core and a coolant supply unit according to one embodiment. [Figure 6] FIG. 6 is a view of the stator core according to the embodiment as viewed from the other axial side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 1, a moving body 1000 of this embodiment 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), an electric vehicle (EV), etc. The moving body 1000 includes a vehicle body 110, a driving device 100 that rotates the wheels of the moving body 1000, and a battery 120 that supplies power to the driving device 100. The driving device 100 and the battery 120 are housed inside the vehicle body 110.

[0013] In the following description, the vertical direction is defined based on the positional relationship when the moving body 1000 equipped with the drive unit 100 is located on a horizontal road surface R. In other words, the relative positional relationship in the vertical direction described in the following embodiments only needs to be satisfied when the moving body 1000 equipped with the drive unit 100 is located on a horizontal road surface R.

[0014] In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z axis direction is the vertical direction. The +Z side is the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is simply called the "upper side", and the lower side in the vertical direction is simply called the "lower side". The X axis direction is a direction perpendicular to the Z axis direction and is the front-rear direction of the moving body 1000, which is a vehicle. In the following embodiments, the +X side is the front side of the moving body 1000, and the -X side is the rear side of the moving body 1000. The Y axis direction is a direction perpendicular to both the X axis direction and the Z axis direction, and is the left-right direction of the moving body 1000, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the moving body 1000, and the -Y side is the right side of the moving body 1000. The front-rear direction and the left-right direction are horizontal directions perpendicular to the vertical direction.

[0015] Note that the positional relationship in the front-rear direction is not limited to that in the following embodiment, and the +X side may be the rear side of the moving body 1000, and the -X side may be the front side of the moving body 1000. In this case, the +Y side is the right side of the moving body 1000, and the -Y side is the left side of the moving body 1000. In addition, in this specification, a "parallel direction" includes a substantially parallel direction, and a "perpendicular direction" includes a substantially perpendicu- lar direction.

[0016] The central axis J, which is shown in the drawings as appropriate, is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, in the left-right direction of the moving body 1000. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply called the "axial direction", the radial direction centered on the central axis J is simply called the "radial direction", and the circumferential direction centered on the central axis J, that is, around the axis of the central axis J, is simply called the "circumferential direction". The left side (+Y side) in the axial direction is called the "one axial side", and the right side (-Y side) in the axial direction is called the "other axial side".

[0017] An arrow θ shown in the drawings indicates the circumferential direction. In the following description, the side in the circumferential direction that progresses clockwise around the central axis J as viewed from the right side, i.e., the side to which the arrow θ points (+θ side), is referred to as the "one circumferential side," and the side in the circumferential direction that progresses counterclockwise around the central axis J as viewed from the right side, i.e., the opposite side to the side to which the arrow θ points (-θ side), is referred to as the "other circumferential side."

[0018] The driving device 100 of this embodiment shown in Fig. 2 is mounted on a moving body 1000, which is a vehicle, and rotates an axle 64 of the moving body 1000. As shown in Fig. 2, the driving device 100 includes a rotating electric machine 10 and a transmission device 60. That is, the moving body 1000 includes the rotating electric machine 10 and the transmission device 60. The transmission device 60 is connected to the rotating electric machine 10 and transmits the rotation of the rotating electric machine 10, that is, the rotation of a rotor 30 described later, to the axle 64 of the moving body 1000. The transmission device 60 of this embodiment includes a gear housing 61, a reduction gear 62 connected to the rotating electric machine 10, and a differential gear 63 connected to the reduction gear 62.

[0019] The gear housing 61 accommodates therein the reduction gear 62, the differential gear 63, and oil O. The oil O is stored in a lower region within the gear housing 61. The oil O circulates within a refrigerant flow passage 90, which will be described later. The oil O is used as a refrigerant that cools the rotating electric machine 10. The oil O is also used as a lubricant for the reduction gear 62 and the differential gear 63. As the oil O, for example, it is preferable to use an oil equivalent to an automatic transmission lubricant (ATF: Automatic Transmission Fluid) that has a relatively low viscosity in order to function as a refrigerant and a lubricant.

[0020] The differential device 63 has a ring gear 63a. Torque output from the rotating electric machine 10 is transmitted to the ring gear 63a via the reduction gear 62. A lower end of the ring gear 63a is immersed in oil O stored in the gear housing 61. The oil O is scooped up as the ring gear 63a rotates. The scooped up oil O is supplied to the reduction gear 62 and the differential device 63, for example, as lubricating oil.

[0021] The rotating electric machine 10 is a part that drives the drive device 100. The rotating electric machine 10 is located, for example, on the other axial side of the transmission device 60. In this embodiment, the rotating electric machine 10 is a motor. The rotating electric machine 10 includes a motor housing 20, a rotor 30 that is rotatable about a central axis J, a stator 40, and a refrigerant supply unit 50.

[0022] The motor housing 20 is a housing that accommodates the rotor 30 and the stator 40 therein. The motor housing 20 is connected to the other axial side of the gear housing 61. The motor housing 20 has a peripheral wall portion 21, a partition wall portion 22, and a lid portion 23. The peripheral wall portion 21 and the partition wall portion 22 are, for example, part of the same single member. The lid portion 23 is, for example, separate from the peripheral wall portion 21 and the partition wall portion 22.

[0023] The peripheral wall portion 21 is cylindrical and surrounds the central axis J, opening on the other axial side. The partition portion 22 is connected to one axial end of the peripheral wall portion 21. The partition portion 22 axially separates the interior of the motor housing 20 from the interior of the gear housing 61. The partition portion 22 has a partition opening 22a connecting the interior of the motor housing 20 to the interior of the gear housing 61. A bearing 34 is held in the partition portion 22. The lid portion 23 is fixed to the other axial end of the peripheral wall portion 21. The lid portion 23 closes the opening on the other axial side of the peripheral wall portion 21. A bearing 35 is held in the lid portion 23.

[0024] As shown in FIG. 3, the motor housing 20 has a support portion 24. The support portion 24 is provided on the inner circumferential surface of the peripheral wall portion 21. The support portion 24 protrudes radially inward. The radially inner surface of the support portion 24 is an arc-shaped curved surface centered on the central axis J. The radially inner surface of the support portion 24 contacts an outer circumferential surface 43c of a stator core main body 43 (described later) of the stator 40. In this way, the support portion 24 supports the stator 40 from the radial outside. The support portion 24 extends in the axial direction. Although not shown, a plurality of support portions 24 are provided at intervals along the circumferential direction.

[0025] In this embodiment, the support portion 24 includes an opposing support portion 24a disposed opposite to one circumferential side (+θ side) of the coolant supply portion 50. The opposing support portion 24a is located on the upper side of the stator 40. The opposing support portion 24a protrudes downward. The opposing support portion 24a has a through groove 24b penetrating the opposing support portion 24a in the circumferential direction. The through groove 24b is recessed radially outward from the radially inner surface of the opposing support portion 24a. As shown in FIG. 4, in this embodiment, a plurality of through grooves 24b are provided at intervals in the axial direction. For example, two through grooves 24b are provided. An end portion on one axial side of the opposing support portion 24a is located on the other axial side of an end portion on one axial side of a stator core main body 43 described later. A portion of the inner peripheral surface of the motor housing 20 located on one axial side of the opposing support portion 24a faces an outer peripheral surface 43c of the stator core main body 43 in the radial direction via a gap.

[0026] 2, the rotor 30 faces the stator 40 with a gap therebetween. The rotor 30 has a shaft 31 and a rotor body 32. Although not shown, the rotor body 32 has a rotor core and a rotor magnet fixed to the rotor core. The torque of the rotor 30 is transmitted to the transmission device 60.

[0027] The shaft 31 is rotatable about a central axis J. The shaft 31 is rotatably supported by bearings 34, 35. In this embodiment, the shaft 31 is a hollow shaft. The shaft 31 is cylindrical and extends in the axial direction about the central axis J. The shaft 31 is provided with a hole 33 that connects the inside of the shaft 31 to the outside of the shaft 31. The shaft 31 extends across the inside of the motor housing 20 and the inside of the gear housing 61. One axial end of the shaft 31 protrudes into the inside of the gear housing 61. A reduction gear 62 is connected to one axial end of the shaft 31.

[0028] The stator 40 faces the rotor 30 in the radial direction with a gap therebetween. More specifically, the stator 40 is located radially outside the rotor 30. The stator 40 is fixed inside the motor housing 20. The stator 40 includes a stator core 41 and a coil assembly 42.

[0029] The stator core 41 is annular and surrounds the central axis J of the rotating electric machine 10. The stator core 41 is located radially outside the rotor 30. The stator core 41 surrounds the rotor 30. As shown in FIG. 4, the stator core 41 is configured by stacking a plurality of plate members 41a, such as electromagnetic steel plates, in the axial direction. Axially adjacent plate members 41a are fixed to each other, for example, by being partially crimped. As shown in FIGS. 5 and 6, in this embodiment, the stator core 41 has a four-fold symmetric shape around the central axis J.

[0030] The stator core 41 has a stator core body 43 and a protruding portion 49. The stator core body 43 is annular and surrounds the rotor 30. More specifically, the stator core body 43 is cylindrical and opens on both axial sides centered on the central axis J. The stator core body 43 has a cylindrical outer circumferential surface 43c that surrounds the rotor 30. In this embodiment, the outer circumferential surface 43c is cylindrical and centered on the central axis J. The outer circumferential surface 43c constitutes a part of the outer circumferential surface of the stator core 41. In this embodiment, the outer circumferential surface of the stator core 41, i.e., the radial outer side surface of the stator core 41, is constituted by the outer circumferential surface 43c and the radial outer side surface of the protruding portion 49. As shown in FIG. 3, the outer circumferential surface 43c is supported from the radial outside by the support portion 24 provided on the inner circumferential surface of the motor housing 20. The outer circumferential surface 43c is disposed radially opposite a portion of the inner circumferential surface of the motor housing 20 where the support portion 24 is not provided, with a gap therebetween.

[0031] As shown in Fig. 3, Fig. 5, and Fig. 6, the stator core body 43 has a cylindrical core back 43a extending in the axial direction, and a plurality of teeth 43b extending radially inward from the core back 43a. That is, the stator core 41 has the core back 43a and the plurality of teeth 43b. The core back 43a is annular and surrounds the central axis J. The outer peripheral surface of the core back 43a is the outer peripheral surface 43c of the stator core body 43. That is, the core back 43a has a cylindrical outer peripheral surface 43c. The plurality of teeth 43b are arranged at equal intervals around one revolution in the circumferential direction.

[0032] In this embodiment, the core back 43a has a plurality of flux barrier portions 48 arranged at intervals in the circumferential direction. In this specification, the "flux barrier portion" is a portion that can suppress the flow of magnetic flux. In other words, magnetic flux does not easily pass through the flux barrier portion. The flux barrier portion is not particularly limited as long as it can suppress the flow of magnetic flux, and may include a void portion or a non-magnetic portion such as a resin portion. In this embodiment, the flux barrier portion 48 is a void portion formed by a hole that penetrates the core back 43a in the axial direction. The hole that constitutes the flux barrier portion 48 is, for example, a circular hole.

[0033] The multiple flux barrier portions 48 are arranged at equal intervals around the circumference. The multiple flux barrier portions 48 are arranged radially outside slot portions provided between the circumferentially adjacent teeth 43b. The inner diameter of the flux barrier portion 48 is equal to or smaller than the interval between the circumferentially adjacent teeth 43b, i.e., the circumferential dimension of the slot portion. In this embodiment, the flux barrier portion 48 is located at the center in the radial direction between the inner peripheral surface and the outer peripheral surface 43c of the core back 43a.

[0034] The protrusion 49 protrudes radially outward from the outer circumferential surface 43c of the core back 43a. The protrusion 49 is a fixed portion fixed to the motor housing 20. As shown in FIG. 5, the protrusion 49 extends in the axial direction. The protrusion 49 extends, for example, from one axial end of the stator core body 43 to the other axial end of the stator core body 43. A plurality of protrusions 49 are provided at intervals in the circumferential direction. For example, four protrusions 49 are provided.

[0035] The protrusion 49 includes a first protrusion 44, a second protrusion 45, a third protrusion 46, and a fourth protrusion 47. The first protrusion 44, the second protrusion 45, the third protrusion 46, and the fourth protrusion 47 are arranged at intervals from each other in the circumferential direction. In this embodiment, the first protrusion 44 and the second protrusion 45 are located above the central axis J. In this embodiment, the third protrusion 46 and the fourth protrusion 47 are located below the central axis J. The first protrusion 44, the second protrusion 45, the third protrusion 46, and the fourth protrusion 47 are arranged at equal intervals over one circumference in the circumferential direction, for example. The first protrusion 44, the second protrusion 45, the third protrusion 46, and the fourth protrusion 47 have, for example, the same shape as each other. Therefore, in the following description, the description of the shapes of the protrusions 49 other than the first protrusion 44 may be omitted. In this embodiment, each protrusion 49 has an asymmetric shape in the circumferential direction.

[0036] The first protrusion 44 is provided at an upper end of the front portion of the stator core body 43. The first protrusion 44 protrudes obliquely upward and forward from the stator core body 43. The second protrusion 45 is provided at an upper end of the rear portion of the stator core body 43. The second protrusion 45 protrudes obliquely upward and backward from the stator core body 43. The third protrusion 46 is provided at a lower end of the rear portion of the stator core body 43. The third protrusion 46 protrudes obliquely downward and backward from the stator core body 43. The fourth protrusion 47 is provided at a lower end of the front portion of the stator core body 43. The fourth protrusion 47 protrudes obliquely downward and forward from the stator core body 43.

[0037] As shown in FIG. 3, the first protruding portion 44 is located on one circumferential side (+θ side) of the coolant supply portion 50. The first protruding portion 44 is located on one circumferential side of the opposing support portion 24a. In this embodiment, the first protruding portion 44 is located on one circumferential side of the upper apex VP of the stator core main body 43. The apex VP is a portion located on the uppermost side of the outer circumferential surface 43c of the stator core main body 43. When viewed in the axial direction, the apex VP is a portion of the outer circumferential surface 43c of the stator core main body 43 that intersects with a virtual line CL that passes through the central axis J and extends in the vertical direction. The apex VP is supported from above by, for example, the opposing support portion 24a. In this embodiment, the radial outer end of the first protruding portion 44 is located below the apex VP.

[0038] The first protruding portion 44 is disposed away from the inner peripheral surface of the motor housing 20. The circumferential dimension of the first protruding portion 44 becomes smaller toward the radially outward side. The outer shape of the radially outer end portion of the first protruding portion 44 is an arc shape that is convex toward the radially outward side when viewed in the axial direction. The first side surface 44a of the first protruding portion 44 facing the other circumferential side (-θ side) is an inclined surface located on one circumferential side (+θ side) as it moves radially outward from the outer peripheral surface 43c of the stator core main body 43. In other words, the first protruding portion 44 has the first side surface 44a as an inclined surface extending radially outward and toward one circumferential side from the outer peripheral surface 43c of the core back 43a. In this embodiment, the first side surface 44a faces obliquely forward upward.

[0039] A radially inner end of the first side surface 44a is connected to the outer peripheral surface 43c of the stator core body 43, i.e., the outer peripheral surface 43c of the core back 43a. When viewed in the axial direction of the central axis J, the first side surface 44a extends along a tangent line TL1a tangent to a connection portion P1a to which the radially inner end of the first side surface 44a of the outer peripheral surface 43c of the core back 43a is connected. In this embodiment, the connection portion P1a is located forward and below the apex VP. When viewed in the axial direction, the tangent line TL1a is inclined obliquely with respect to the front-rear direction (X-axis direction). The tangent line TL1a is located lower as it approaches the front side.

[0040] The first side surface 44a is smoothly connected to the outer peripheral surface 43c of the stator core main body 43. For example, the first side surface 44a extends linearly when viewed in the axial direction. When viewed in the axial direction, the first side surface 44a extends obliquely downward toward the front side from the connection portion P1a. In this embodiment, the first side surface 44a is positioned lower as it moves away from a first supply port 54 (described later) in the circumferential direction. The first side surface 44a is positioned lower as it moves toward the front side of the moving body 1000 on which the drive unit 100 is mounted.

[0041] The second side surface 44b of the first protruding portion 44 facing one circumferential side (+θ side) is an inclined surface located toward the other circumferential side (-θ side) as it moves radially outward from the outer circumferential surface 43c of the stator core body 43. In this embodiment, the second side surface 44b faces obliquely downward toward the front side.

[0042] The radially inner end of the second side surface 44b is connected to the outer peripheral surface 43c of the stator core body 43. When viewed in the axial direction of the central axis J, the second side surface 44b extends in a direction inclined radially outward from a tangent line TL1b tangent to a connection portion P1b to which the radially inner end of the second side surface 44b of the outer peripheral surface 43c of the stator core body 43 is connected. In this embodiment, the connection portion P1b is located forward and below the connection portion P1a. When viewed in the axial direction, the tangent line TL1b is inclined obliquely with respect to the front-rear direction. The tangent line TL1b is located lower as it moves toward the front side. The inclination of the tangent line TL1b with respect to the front-rear direction is greater than the inclination of the tangent line TL1a with respect to the front-rear direction.

[0043] The second side surface 44b is smoothly connected to the outer circumferential surface 43c of the stator core body 43. The second side surface 44b extends linearly, for example, when viewed in the axial direction. The second side surface 44b extends obliquely upward and forward from the connection portion P1b when viewed in the axial direction.

[0044] The second protruding portion 45 is located on the other circumferential side (-θ side) of the coolant supply portion 50. The second protruding portion 45 is located on the other circumferential side of the opposing support portion 24a. In this embodiment, the second protruding portion 45 is located on the other circumferential side of the upper vertex VP of the stator core body 43. In this embodiment, the radial outer end of the second protruding portion 45 is located above the radial outer end of the first protruding portion 44. The upper end of the second protruding portion 45 is located, for example, above the vertex VP.

[0045] The third side surface 45a of the second protruding portion 45 facing one circumferential side (+θ side) is an inclined surface located toward the other circumferential side (-θ side) as it moves radially outward from the outer circumferential surface 43c of the stator core body 43. In this embodiment, the third side surface 45a faces diagonally upward and forward.

[0046] A radially inner end of the third side surface 45a is connected to the outer peripheral surface 43c of the stator core body 43. When viewed in the axial direction of the central axis J, the third side surface 45a extends in a direction inclined radially outward from a tangent line TL2a tangent to a connection portion P2a to which the radially inner end of the third side surface 45a of the outer peripheral surface 43c of the stator core body 43 is connected. In this embodiment, the connection portion P2a is located rearward and below the apex VP. When viewed in the axial direction, the tangent line TL2a is inclined obliquely with respect to the front-rear direction. The tangent line TL2a is located upward as it approaches the front side.

[0047] The third side surface 45a is smoothly connected to the outer circumferential surface 43c of the stator core body 43. The third side surface 45a extends linearly, for example, when viewed in the axial direction. The third side surface 45a extends obliquely upward and rearward from the connection portion P2a when viewed in the axial direction.

[0048] The fourth side surface 45b of the second protruding portion 45 facing the other circumferential side (-θ side) is an inclined surface located on one circumferential side (+θ side) as it moves radially outward from the outer circumferential surface 43c of the stator core main body 43. That is, the second protruding portion 45 has the fourth side surface 45b as an inclined surface extending radially outward and on one circumferential side from the outer circumferential surface 43c of the core back 43a. In this embodiment, the fourth side surface 45b faces obliquely upward toward the rear side.

[0049] The radially inner end of the fourth side surface 45b is connected to the outer peripheral surface 43c of the stator core body 43, i.e., the outer peripheral surface 43c of the core back 43a. When viewed in the axial direction of the central axis J, the fourth side surface 45b extends along a tangent line TL2b tangent to a connection portion P2b to which the radially inner end of the fourth side surface 45b of the outer peripheral surface 43c of the stator core body 43 is connected. In this embodiment, the connection portion P2b is located rearward and below the connection portion P2a. When viewed in the axial direction, the tangent line TL2b is inclined obliquely with respect to the front-rear direction. The tangent line TL2b is located upward as it approaches the front side. The inclination of the tangent line TL2b with respect to the front-rear direction is greater than the inclination of the tangent line TL2a with respect to the front-rear direction.

[0050] The fourth side surface 45b is smoothly connected to the outer circumferential surface 43c of the stator core body 43. The fourth side surface 45b extends linearly, for example, when viewed in the axial direction. The fourth side surface 45b extends obliquely upward and forward from the connection portion P2b when viewed in the axial direction.

[0051] The stator core 41 has a hole 49a provided in a radially outer portion of the stator core 41. The radially outer portion of the stator core 41 is a portion of the stator core 41 that is located radially outward from the radial center of the stator core 41. The radially outer portion of the stator core 41 includes, for example, a core back 43a and a protruding portion 49. In this embodiment, the hole 49a is provided in the protruding portion 49. One hole 49a is provided for each protruding portion 49.

[0052] The hole 49a extends in the axial direction. In this embodiment, the hole 49a is a through hole that penetrates the protruding portion 49 in the axial direction. The hole 49a is, for example, a circular hole. The bolt 25 extending in the axial direction is passed through the hole 49a. Although not shown in the figure, the bolt 25 is passed through the hole 49a from the other axial side (-Y side) and screwed into a female screw hole provided in the motor housing 20. In this way, the protruding portion 49 is fixed to the motor housing 20 by the bolt 25. A washer 26 is provided between the protruding portion 49 and the bolt 25. The washer 26 is plate-shaped with a plate surface facing the axial direction and is annular in shape surrounding the bolt 25.

[0053] As shown in FIG. 5, the stator core 41 has a welded portion 80 provided on the radially outer surface of the stator core 41. In this embodiment, the welded portion 80 extends in the axial direction. More specifically, the welded portion 80 extends from one axial end of the stator core 41 to the other axial end. The welded portion 80 is a portion made by welding a part of the radially outer surface of the stator core 41. In this embodiment, the welded portion 80 is made by welding the groove bottom surface of the weld groove 41b provided on the radially outer surface of the stator core 41.

[0054] The weld groove 41b is recessed radially inward from the radial outer side surface of the stator core 41. The weld groove 41b extends in the axial direction. More specifically, the weld groove 41b extends from one axial end of the stator core 41 to the other axial end. The weld groove 41b opens on both axial sides. The groove bottom surface of the weld groove 41b is the surface of the inner surface of the weld groove 41b that faces radially outward. The welding method for making the welded portion 80 is not particularly limited, and may be arc welding or laser welding. The welded portion 80 is provided across multiple plate members 41a and fixes the multiple plate members 41a together. In this embodiment, multiple welded portions 80 are provided.

[0055] The multiple welded portions 80 are arranged at intervals along the circumferential direction. As shown in FIG. 6, in this embodiment, the multiple welded portions 80 are arranged at equal angles along the circumferential direction. That is, the circumferential angle φ between adjacent welded portions 80 in the circumferential direction on the radially outer surface of the stator core 41 is the same between any two welded portions 80. In this embodiment, twelve welded portions 80 are provided. The twelve welded portions 80 are provided at positions that divide the radially outer surface of the stator core 41 into twelve equal parts in the circumferential direction. In this embodiment, the angle φ is 30°.

[0056] The multiple welded portions 80 are arranged on the radially outer surface of the stator core 41 with rotational symmetry around the central axis J. In this embodiment, the multiple welded portions 80 are arranged on the radially outer surface of the stator core 41 with four-fold symmetry around the central axis J. In other words, when the stator core 41 is rotated 90° around the central axis J, the welded portions 80 in the stator core 41 after the rotation overlap with the positions of the welded portions 80 in the stator core 41 before the rotation. In this embodiment, the multiple welded portions 80 include a first welded portion 81, a second welded portion 82, and a third welded portion 83.

[0057] The first welded portion 81 is a welded portion 80 provided on a virtual line IL1 passing through the hole portion 49a and the central axis J in the axial direction on the radially outer surface of the stator core 41. The virtual line IL1 extends radially through the center of the hole portion 49a and the central axis J in the axial direction. In the present embodiment, the virtual line IL1 passes through the circumferential center of one tooth 43b and the circumferential center between the flux barrier portions 48 adjacent in the circumferential direction in the axial direction. In the present embodiment, the first welded portion 81 is provided on the radially outer surface of the protruding portion 49. More specifically, the first welded portion 81 is provided on the radially outer surface at the radially outer end of the protruding portion 49. The first welded portion 81 is located radially outside the hole portion 49a.

[0058] In this embodiment, a plurality of first welded portions 81 are provided. One first welded portion 81 is provided for each of the first protruding portion 44, the second protruding portion 45, the third protruding portion 46, and the fourth protruding portion 47. That is, in this embodiment, a total of four first welded portions 81 are provided.

[0059] 3, when viewed in the axial direction, a distance L2 between the flux barrier portion 48 and the hole portion 49a is greater than a distance L1 between the first welded portion 81 and the hole portion 49a. The distance L1 is the shortest distance between the first welded portion 81 and the hole portion 49a in the protrusion 49 in which the first welded portion 81 is provided. The distance L1 is the radial distance between the first welded portion 81 and the hole portion 49a. The distance L2 is the shortest distance between the hole portion 49a and the flux barrier portion 48 closest to the hole portion 49a. The distance L2 is, for example, twice or more the distance L1.

[0060] The second welded portion 82 is a welded portion 80 provided on the outer peripheral surface 43c of the core back 43a. As shown in FIG. 6, in this embodiment, a plurality of second welded portions 82 are provided. The second welded portions 82 are provided in the portions of the outer peripheral surface 43c located between the protruding portions 49 adjacent to each other in the circumferential direction. More specifically, the second welded portions 82 are provided in the portions of the outer peripheral surface 43c located between the first protruding portion 44 and the second protruding portion 45 in the circumferential direction, the portions of the outer peripheral surface 43c located between the second protruding portion 45 and the third protruding portion 46 in the circumferential direction, the portions of the outer peripheral surface 43c located between the third protruding portion 46 and the fourth protruding portion 47 in the circumferential direction, and the portions of the outer peripheral surface 43c located between the fourth protruding portion 47 and the first protruding portion 44 in the circumferential direction. That is, in this embodiment, a total of four second welded portions 82 are provided.

[0061] Each second welded portion 82 is disposed between each pair of protruding portions 49 and closer to the other circumferential side (-θ side). For example, the second welded portion 82 provided in a portion of the outer circumferential surface 43c located between the first protruding portion 44 and the second protruding portion 45 in the circumferential direction is provided at a position closer to the third side surface 45a in the circumferential direction than the first side surface 44a. As shown in FIG. 3, the second welded portion 82 provided in a portion of the outer circumferential surface 43c located between the first protruding portion 44 and the second protruding portion 45 in the circumferential direction is located on the other circumferential side of the apex VP.

[0062] In the present embodiment, the second welded portion 82 is located radially outward of a portion of the core back 43a that is located between circumferentially adjacent flux barrier portions 48. The second welded portion 82 is located radially outward of one of the teeth 43b. As shown in Fig. 6, when viewed in the axial direction, an imaginary line IL2 connecting the second welded portion 82 and the central axis J passes through the circumferential center of one of the teeth 43b and the circumferential center between the circumferentially adjacent flux barrier portions 48.

[0063] The third welded portion 83 is a welded portion 80 provided on a portion of the radially outer surface of the protruding portion 49 whose circumferential position is different from the circumferential position of the hole portion 49a. In this embodiment, a plurality of third welded portions 83 are provided. One third welded portion 83 is provided on each of the first protruding portion 44, the second protruding portion 45, the third protruding portion 46, and the fourth protruding portion 47. That is, in this embodiment, a total of four third welded portions 83 are provided.

[0064] The third welded portion 83 is provided on a side surface of each protruding portion 49 facing the other circumferential side (-θ side). More specifically, the third welded portion 83 is provided on a circumferential end portion of each protruding portion 49 on the side surface facing the other circumferential side that is closer to the outer circumferential surface 43c of the core back 43a (-θ side). The side surface of the first protruding portion 44 facing the other circumferential side is a first side surface 44a as an inclined surface. The side surface of the second protruding portion 45 facing the other circumferential side is a fourth side surface 45b as an inclined surface.

[0065] In the present embodiment, the third welded portion 83 is located radially outside a portion of the core back 43a that is located between circumferentially adjacent flux barrier portions 48. The third welded portion 83 is located radially outside one of the teeth 43b. When viewed in the axial direction, an imaginary line IL3 connecting the third welded portion 83 and the central axis J passes through the circumferential center of one of the teeth 43b and the circumferential center between the circumferentially adjacent flux barrier portions 48.

[0066] The first welded portion 81, the second welded portion 82, and the third welded portion 83 are alternately arranged in this order on the radially outer surface of the stator core 41 toward one circumferential side (+θ side). In this embodiment, the second welded portion 82 and the third welded portion 83 are provided on the upper surface, the front surface (+X side), the lower surface, and the rear surface (-X side) of the stator core 41, respectively. The first welded portion 81 is provided at the boundary between the front surface and the upper surface of the stator core 41, the boundary between the upper surface and the rear surface of the stator core 41, the boundary between the rear surface and the lower surface of the stator core 41, and the boundary between the lower surface and the front surface of the stator core 41. In this embodiment, the first welded portion 81 is located radially outward of the second welded portion 82 and the third welded portion 83.

[0067] As shown in Fig. 2, the coil assembly 42 has a plurality of coils 42c attached to the stator core 41 along the circumferential direction. The plurality of coils 42c are attached to each of the teeth 43b of the stator core 41 via insulators (not shown). The plurality of coils 42c are arranged along the circumferential direction. More specifically, the plurality of coils 42c are arranged at equal intervals around one circumference along the circumferential direction. Although not shown, the coil assembly 42 may have a bundling member or the like bundling the coils 42c, or may have crossover wires connecting the coils 42c to each other.

[0068] The coil assembly 42 has coil ends 42a, 42b protruding in the axial direction from the stator core 41. The coil end 42a is a portion protruding from the stator core 41 to one side in the axial direction. The coil end 42b is a portion protruding from the stator core 41 to the other side in the axial direction. The coil end 42a includes a portion of each coil 42c included in the coil assembly 42 that protrudes from the stator core 41 to one side in the axial direction. The coil end 42b includes a portion of each coil 42c included in the coil assembly 42 that protrudes from the stator core 41 to the other side in the axial direction. In this embodiment, the coil ends 42a, 42b are annular with the central axis J as the center. Although not shown, the coil ends 42a, 42b may include a bundling member bundling each coil 42c, or may include a crossover wire connecting each coil 42c to each other.

[0069] In this embodiment, the refrigerant supply unit 50 is tubular and extends in the axial direction. In other words, in this embodiment, the refrigerant supply unit 50 is a pipe that extends in the axial direction. Both axial end portions of the refrigerant supply unit 50 are supported by the motor housing 20. One axial end portion of the refrigerant supply unit 50 is supported by, for example, the partition wall portion 22. The other axial end portion of the refrigerant supply unit 50 is supported by, for example, the lid portion 23. The refrigerant supply unit 50 is located radially outside the stator 40. In this embodiment, the refrigerant supply unit 50 is located above the stator 40.

[0070] As shown in FIG. 3, the refrigerant supply part 50 is located between the first protruding part 44 and the second protruding part 45 in the circumferential direction. The refrigerant supply part 50 is located between the opposing support part 24a and the second protruding part 45 in the circumferential direction. In this embodiment, the refrigerant supply part 50 is located at a position closer to the second protruding part 45 than the first protruding part 44 in the circumferential direction. The refrigerant supply part 50 is located, for example, above the boundary part between the second protruding part 45 and the stator core main body 43. The refrigerant supply part 50 is located above the connection part P2a. When viewed in the vertical direction, the refrigerant supply part 50 is located so as to overlap the end part on one circumferential side (+θ side) of the third side surface 45a of the second protruding part 45 and the outer circumferential surface 43c of the stator core main body 43. As shown in FIG. 5, the refrigerant supply part 50 has a wide part 51, an inlet part 52, and an outlet part 53.

[0071] As shown in FIG. 4, in this embodiment, the entire refrigerant supply unit 50 except for the inlet portion 52 and the outlet portion 53 is the wide portion 51. In this embodiment, the wide portion 51 is a main body portion of the refrigerant supply unit 50. The positional relationship of the wide portion 51 with respect to the stator core 41 is similar to the positional relationship of the refrigerant supply unit 50 with respect to the stator core 41 described above. The wide portion 51 is located radially outside the stator 40. In this embodiment, the wide portion 51 is located on the upper side of the stator 40. The wide portion 51 is located circumferentially between the opposing support portion 24a and the second protruding portion 45.

[0072] The axial dimension of wide portion 51 is greater than the axial dimension of stator core 41. Wide portion 51 protrudes beyond stator core 41 on both axial sides. Wide portion 51 is disposed across the upper side of stator core 41 and the upper sides of coil ends 42a, 42b. The portion of wide portion 51 that protrudes beyond stator core 41 to one axial side is located above coil end 42a. The portion of wide portion 51 that protrudes beyond stator core 41 to the other axial side is located above coil end 42b.

[0073] The wide portion 51 is a portion whose circumferential dimension is greater than its radial dimension. As shown in FIG. 3, the wide portion 51 is, for example, in the shape of a cylinder crushed in the radial direction, that is, in the shape of a generally elliptical cylinder flattened in the radial direction. The radially inner surface of the wide portion 51 is a facing surface 51a that faces the outer peripheral surface of the stator core 41 in the radial direction. The facing surface 51a faces the outer peripheral surface 43c of the stator core main body 43 in the radial direction. The facing surface 51a is shaped along the outer peripheral surface of the stator core 41, that is, along the outer peripheral surface 43c of the stator core main body 43 in this embodiment. The facing surface 51a is a curved surface that is recessed radially outward. When viewed in the axial direction, the facing surface 51a is in the shape of a circular arc that is centered on the central axis J and convex radially outward. The radial gap between the facing surface 51a and the outer peripheral surface 43c is, for example, smaller than the radial depth of the through groove 24b.

[0074] As shown in Fig. 4, the inlet portion 52 is connected to one axial end of the wide portion 51. The inlet portion 52 is cylindrical and opens to one axial end. The inlet portion 52 is one axial end of the refrigerant supply portion 50. The inlet portion 52 is supported by the partition portion 22, for example, by being fitted into a hole (not shown) provided in the partition portion 22. Oil O flows into the interior of the refrigerant supply portion 50 from the inlet portion 52.

[0075] The outlet portion 53 is connected to the end portion on the other axial side of the wide portion 51. The outlet portion 53 is cylindrical and opens to the other axial side. The outlet portion 53 is the end portion on the other axial side of the refrigerant supply portion 50. The outlet portion 53 is, for example, fitted into a hole (not shown) provided in the lid portion 23 and supported by the lid portion 23. A part of the oil O that flows into the inside of the refrigerant supply portion 50 from the inlet portion 52 flows out from the outlet portion 53. In this embodiment, the flow direction of the oil O in the refrigerant supply portion 50 is from one axial side to the other axial side. That is, in the flow direction of the oil O in the refrigerant supply portion 50, the one axial side is the upstream side, and the other axial side is the downstream side.

[0076] The refrigerant supply unit 50 has a supply port 50a that supplies oil O as a refrigerant to the stator 40. In this embodiment, the supply port 50a is an injection port that injects a portion of the oil O that has flowed into the refrigerant supply unit 50 to the outside of the refrigerant supply unit 50. A plurality of supply ports 50a are provided. In this embodiment, all of the supply ports 50a are provided in the wide portion 51. That is, the wide portion 51 has at least one supply port 50a.

[0077] The supply port 50a is formed by a hole penetrating the wall of the tubular refrigerant supply unit 50 from the inner peripheral surface to the outer peripheral surface. The supply port 50a is an opening that opens on the outer peripheral surface of the refrigerant supply unit 50 among the openings of the hole penetrating the wall of the tubular refrigerant supply unit 50 from the inner peripheral surface to the outer peripheral surface. The supply port 50a is, for example, circular. In this embodiment, the supply port 50a provided in the wide portion 51 includes a first supply port 54, a second supply port 55, and a third supply port 56.

[0078] The first supply port 54 is a supply port 50a that supplies oil O as a refrigerant to the stator core 41. The first supply port 54 is a supply port 50a that opens on one circumferential side (+θ side). As shown in FIG. 3, in this embodiment, the first supply port 54 is located on the other circumferential side (-θ side) of the apex VP of the stator core main body 43. The first supply port 54 is located on the upper side of the stator core main body 43. The opposing support portion 24a and the first protruding portion 44 are located on one circumferential side of the first supply port 54.

[0079] The first supply port 54 is provided in a portion of the wide portion 51 near the radially inner side at an end portion on one circumferential side (+θ side). In this embodiment, the first supply port 54 opens in a direction inclined obliquely radially inward with respect to the circumferential direction. As shown in Fig. 4, in this embodiment, a plurality of first supply ports 54 are provided. The first supply port 54 includes, for example, three first supply ports 54a, 54b, and 54c.

[0080] The first supply port 54a, the first supply port 54b, and the first supply port 54c are arranged in this order from one axial side to the other axial side at intervals. The first supply ports 54a and 54b are located on one axial side of the axial center of the stator core 41. The first supply port 54c is located on the other axial side of the axial center of the stator core 41. The axial distance between the first supply port 54a and the first supply port 54b is smaller than the axial distance between the first supply port 54b and the first supply port 54c.

[0081] The first supply port 54a is located on one axial side of the opposing support portion 24a. That is, in the present embodiment, the first supply port 54a is a first supply port 54 that is disposed at a position different from the opposing support portion 24a in the axial direction of the central axis J. The inner diameter of the first supply port 54a is smaller than the inner diameters of the other first supply ports 54b and 54c.

[0082] The axial positions of the first supply ports 54b and 54c are the same as the axial positions of the two through grooves 24b provided in the opposing support portion 24a. As shown in FIG. 3, the first supply ports 54b and 54c are the first supply ports 54 that open toward the through groove 24b. In this specification, "the first supply port opens toward the through groove" means that at least a part of the first supply port overlaps with the inside of the through groove when viewed in the direction in which the first supply port opens. In this embodiment, the first supply ports 54b and 54c overlap with the inside of the through groove 24b and the outer circumferential surface 43c of the stator core body 43 when viewed in the direction in which the first supply ports 54b and 54c open. The direction in which the first supply port 54 opens is, for example, the direction in which the hole constituting the first supply port 54 penetrates the wall of the refrigerant supply portion 50 from the inner circumferential surface to the outer circumferential surface.

[0083] The oil O discharged from the first supply ports 54b, 54c is jetted in a direction in which the first supply ports 54b, 54c open, and is supplied to the outer peripheral surface 43c of the stator core body 43. The oil O supplied from the first supply ports 54b, 54c to the outer peripheral surface 43c flows on the outer peripheral surface 43c to one circumferential side (+θ side) and passes through the through groove 24b in the circumferential direction. The oil O that has passed through the through groove 24b flows from the outer peripheral surface 43c to the first side surface 44a of the first protruding portion 44, and overcomes the first protruding portion 44 to one circumferential side. The oil O that has overcome the first protruding portion 44 flows downward between the second side surface 44b and the inner peripheral surface of the motor housing 20, and is supplied to a front portion of the outer peripheral surface 43c of the stator core body 43.

[0084] The second supply port 55 is a supply port 50a that supplies oil O as a refrigerant to the stator core 41. The second supply port 55 is a supply port 50a that opens to the other circumferential side (-θ side). In this embodiment, the second supply port 55 is located on the other circumferential side of the apex VP of the stator core body 43. The second supply port 55 is located on the upper side of the stator core body 43. The second protruding portion 45 is located on the other circumferential side of the second supply port 55. The second supply port 55 is located on the upper side of the end portion on one circumferential side (+θ side) of the second protruding portion 45.

[0085] The second supply port 55 is provided in a portion of the wide portion 51 near the radially outer side at the end portion on the other circumferential side (-θ side). In this embodiment, the second supply port 55 opens in a direction inclined radially outward with respect to the circumferential direction. When viewed in the direction in which the second supply port 55 opens, the second supply port 55 overlaps with a portion of the inner circumferential surface of the motor housing 20 that is disposed opposite the upper side of the second protruding portion 45. The direction in which the second supply port 55 opens is, for example, a direction in which a hole constituting the second supply port 55 penetrates the wall of the refrigerant supply unit 50 from the inner circumferential surface to the outer circumferential surface. As shown in FIG. 4, in this embodiment, a plurality of second supply ports 55 are provided. The second supply port 55 includes, for example, three second supply ports 55a, 55b, and 55c.

[0086] The second supply port 55a, the second supply port 55b, and the second supply port 55c are arranged in this order from one axial side to the other axial side at intervals. The second supply port 55a is located on one axial side of the axial center of the stator core 41. The second supply port 55b is located at approximately the same axial position as the axial center of the stator core 41. The second supply port 55c is located on the other axial side of the axial center of the stator core 41. The axial distance between the second supply port 55a and the second supply port 55b is, for example, the same as the axial distance between the second supply port 55b and the second supply port 55c. The inner diameters of the second supply ports 55a, 55b, and 55c are, for example, the same as each other. The inner diameters of the second supply ports 55a, 55b, and 55c are, for example, the same as the inner diameters of the first supply ports 54b and 54c.

[0087] The oil O discharged from the second supply port 55 is sprayed in the direction in which the second supply port 55 opens, and is supplied to a portion of the inner circumferential surface of the motor housing 20 that is located above the second protruding portion 45. The oil O supplied to the inner circumferential surface of the motor housing 20 from the second supply port 55 flows along the inner circumferential surface of the motor housing 20 to the other circumferential side (-θ side), and passes over the second protruding portion 45 to the other circumferential side. The oil O that passes over the second protruding portion 45 flows downward between the fourth side surface 45b and the inner circumferential surface of the motor housing 20, and is supplied to a rear portion of the outer circumferential surface 43c of the stator core body 43.

[0088] In this embodiment, the first supply port 54 and the second supply port 55 are arranged to be shifted from each other in the axial direction of the central axis J. For example, the first supply port 54a is arranged to be slightly shifted to the other axial side from the second supply port 55a. For example, the first supply port 54b is arranged to be shifted relatively greatly to one axial side from the second supply port 55b. The first supply port 54c is arranged to be slightly shifted to one axial side from the second supply port 55c.

[0089] In this specification, "the first supply port and the second supply port are arranged with a shift in the axial direction" means that the center of the first supply port and the center of the second supply port are arranged with a shift in the axial direction, and a part of the first supply port and a part of the second supply port may be arranged at the same axial position. In this embodiment, a part of the first supply port 54a and a part of the second supply port 55a are arranged at the same axial position. A part of the first supply port 54c and a part of the second supply port 55c are arranged at the same axial position. The first supply port 54b and the second supply port 55b are arranged with a shift in the axial direction as a whole.

[0090] The third supply port 56 is a supply port 50a that supplies oil O as a refrigerant to the coil ends 42a and 42b. The third supply port 56 opens downward. The third supply port 56 has a third supply port 56a arranged on the upper side of the coil end 42a and a third supply port 56b arranged on the upper side of the coil end 42b. The third supply port 56a is located on one axial side of the first supply port 54 and the second supply port 55. The third supply port 56b is located on the other axial side of the first supply port 54 and the second supply port 55. For example, a plurality of the third supply ports 56a and a plurality of the third supply ports 56b are provided. For example, five of the third supply ports 56a and five of the third supply ports 56b are provided. The five third supply ports 56a are arranged at intervals around the wide portion 51. The five third supply ports 56b are arranged at intervals around the wide portion 51.

[0091] As shown in Fig. 2, in this embodiment, the drive unit 100 is provided with a refrigerant flow path 90 in which oil O circulates as a refrigerant. The refrigerant flow path 90 is provided across the interior of the motor housing 20 and the interior of the gear housing 61. The refrigerant flow path 90 is a path through which the oil O stored in the gear housing 61 is supplied to the rotating electric machine 10 and returns to the gear housing 61 again. The refrigerant flow path 90 is provided with a pump 71, a cooler 72, and a refrigerant supply unit 50. The refrigerant flow path 90 has a first flow path portion 91, a second flow path portion 92, a third flow path portion 93, and a fourth flow path portion 94.

[0092] The first flow path portion 91, the second flow path portion 92, and the third flow path portion 93 are provided, for example, in a wall portion of the gear housing 61. The fourth flow path portion 94 is provided, for example, in the cover portion 23. The first flow path portion 91 connects the pump 71 to a portion of the inside of the gear housing 61 in which the oil O is stored. The second flow path portion 92 connects the pump 71 to the cooler 72. The third flow path portion 93 connects the cooler 72 to the inside of the refrigerant supply portion 50. In this embodiment, the third flow path portion 93 is connected to an end portion on one axial side of the refrigerant supply portion 50. The fourth flow path portion 94 connects the inside of the refrigerant supply portion 50 to the inside of the shaft 31. In this embodiment, the fourth flow path portion 94 is connected to an end portion on the other axial side of the refrigerant supply portion 50 and an end portion on the other axial side of the shaft 31.

[0093] When the pump 71 is driven, the oil O stored in the gear housing 61 is sucked up through the first flow passage portion 91 and flows into the cooler 72 through the second flow passage portion 92. The oil O that flows into the cooler 72 is cooled in the cooler 72, and then flows into the inside of the refrigerant supply unit 50 through the third flow passage portion 93. A part of the oil O that flows into the refrigerant supply unit 50 is sprayed from the supply port 50a and supplied to the stator 40. In this embodiment, the oil O sprayed from the first supply port 54 and the second supply port 55 is supplied to the stator core 41. The oil O sprayed from the third supply port 56 is supplied to the coil ends 42a and 42b. Another part of the oil O that flows into the refrigerant supply unit 50 flows into the inside of the shaft 31 through the fourth flow passage portion 94. A part of the oil O that flows into the shaft 31 passes through the inside of the rotor body 32 from the hole portion 33 and is scattered into the stator 40. Another portion of the oil O that has flowed into the shaft 31 is discharged into the gear housing 61 from an opening on one axial side of the shaft 31, and is stored in the gear housing 61 again.

[0094] The oil O supplied to the stator 40 from the supply port 50a and the oil O supplied to the stator 40 from within the shaft 31 remove heat from the stator 40. After cooling the stator 40, the oil O drops downward and accumulates in the lower region within the motor housing 20. The oil O that has accumulated in the lower region within the motor housing 20 returns to the gear housing 61 via the partition opening 22a provided in the partition portion 22. In this manner, the refrigerant flow path 90 supplies the oil O stored in the gear housing 61 to the rotor 30 and the stator 40.

[0095] According to this embodiment, the welded portion 80 provided on the radially outer surface of the stator core 41 includes a first welded portion 81 provided on the radially outer surface of the stator core 41 on a virtual line IL1 connecting the hole portion 49a and the central axis J when viewed in the axial direction. Therefore, the strength of the portion of the stator core 41 near the hole portion 49a can be improved by the first welded portion 81. This makes it possible to suppress deformation of the portion of the stator core 41 near the hole portion 49a when fastening the bolt 25 passed through the hole portion 49a. In particular, when the stator core 41 is composed of a plurality of plate members 41a stacked in the axial direction as in this embodiment, the plurality of plate members 41a can be firmly fixed to each other by the first welded portion 81 in the portion of the stator core 41 near the hole portion 49a. Therefore, it is possible to suppress deformation of the relatively thin plate members 41a. As described above, according to this embodiment, it is possible to suppress deformation of the stator core 41.

[0096] Moreover, the first welded portion 81 is provided radially outward from the central axis J relative to the hole 49a provided in the radially outer portion of the stator core 41. Therefore, the first welded portion 81 can be disposed at a position relatively far from the rotor 30. This makes it possible to make it difficult for the magnetic flux flowing between the stator core 41 and the rotor 30 to pass through the first welded portion 81. Therefore, it is possible to suppress the first welded portion 81 from affecting the magnetic flux flowing between the stator core 41 and the rotor 30. Therefore, even if the first welded portion 81 is provided, it is possible to suppress a deterioration in the magnetic characteristics of the rotating electric machine 10. As a result, it is possible to suppress the deformation of the stator core 41 caused by providing the first welded portion 81 while suppressing a decrease in the output of the rotating electric machine 10.

[0097] Moreover, according to the present embodiment, the hole 49a is provided in the protruding portion 49. The first welded portion 81 is provided on the radially outer surface of the protruding portion 49. Therefore, compared to the case where the hole 49a and the first welded portion 81 are provided in the core back 43a, the hole 49a and the first welded portion 81 can be more effectively prevented from affecting the magnetic flux flowing between the stator core 41 and the rotor 30. This can more effectively prevent the magnetic characteristics of the rotating electric machine 10 from deteriorating. Therefore, the output of the rotating electric machine 10 can more effectively be prevented from deteriorating.

[0098] Moreover, according to the present embodiment, the distance L2 between the flux barrier portion 48 provided in the core back 43a and the hole portion 49a is greater than the distance L1 between the first welded portion 81 and the hole portion 49a when viewed in the axial direction. Therefore, both the hole portion 49a and the first welded portion 81 can be suitably disposed away from the core back 43a radially outward. This can further suppress the influence of the hole portion 49a and the first welded portion 81 on the magnetic flux flowing between the stator core 41 and the rotor 30. Therefore, the magnetic characteristics of the rotating electric machine 10 can be further suppressed from deteriorating. Therefore, the output of the rotating electric machine 10 can be further suppressed from deteriorating.

[0099] Moreover, according to the present embodiment, the welded portion 80 includes the second welded portion 82 provided on the outer circumferential surface 43c of the core back 43a. Therefore, the strength of the stator core 41 can be further improved by the second welded portion 82. Also, the plate members 41a can be more firmly fixed to each other by the second welded portion 82. Therefore, deformation of the stator core 41 can be further suppressed.

[0100] Further, according to the present embodiment, the second welded portion 82 is located radially outside a portion of the core back 43a that is located between the flux barrier portions 48 adjacent to each other in the circumferential direction. Therefore, it is easier to increase the radial distance between the radially outer surface of the stator core 41 and the flux barrier portion 48, and the distance between the flux barrier portion 48 and the second welded portion 82, compared to a case in which the second welded portion 82 is located radially outside the flux barrier portion 48. This makes it easier to ensure a magnetic path through which magnetic flux flows between the radially outer surface of the stator core 41 and the flux barrier portion 48, and between the flux barrier portion 48 and the second welded portion 82. Therefore, it is easy to prevent the second welded portion 82 from affecting the magnetic flux flowing through the core back 43a. Therefore, even if the second welded portion 82 is provided, it is possible to prevent the magnetic characteristics of the rotating electric machine 10 from deteriorating. Therefore, it is possible to further prevent the stator core 41 from being deformed by providing the second welded portion 82, while preventing the output of the rotating electric machine 10 from being reduced.

[0101] According to the present embodiment, the second welded portion 82 is located radially outside the teeth 43b. Here, the magnetic flux flowing from the teeth 43b to the core back 43a flows radially outward in the teeth 43b, and is divided into two circumferential sides in the core back 43a. In this case, the magnetic flux is unlikely to flow in the portion of the radially outer surface of the stator core 41 located radially outside the teeth 43b. Therefore, by providing the second welded portion 82 radially outside the teeth 43b, it is possible to further suppress the influence of the second welded portion 82 on the magnetic flux flowing through the core back 43a. This makes it possible to further suppress the deterioration of the magnetic characteristics of the rotating electric machine 10.

[0102] Moreover, according to the present embodiment, the welded portion 80 includes a third welded portion 83 provided on a portion of the radially outer surface of the protruding portion 49 that is located at a circumferential position different from the circumferential position of the hole portion 49a. Therefore, the strength of the stator core 41 can be further improved by the third welded portion 83. Also, the plate members 41a can be more firmly fixed to each other by the third welded portion 83. Therefore, deformation of the stator core 41 can be further suppressed.

[0103] Further, according to the present embodiment, the third welded portion 83 is provided at the circumferential end portion of the first side surface 44a as an inclined surface on the side (-θ side) close to the outer peripheral surface 43c of the core back 43a. Here, the first side surface 44a as an inclined surface extends along a tangent line TL1a that is in contact with a connection portion P1a to which the radially inner end portion of the first side surface 44a of the outer peripheral surface 43c of the core back 43a is connected. Therefore, the circumferential end portion of the first side surface 44a close to the outer peripheral surface 43c of the core back 43a is more likely to be disposed at a position circumferentially distant from the hole portion 49a compared to the case where the first side surface 44a has a shape like the second side surface 44b. Therefore, by providing the third welded portion 83 at the circumferential end portion of the first side surface 44a close to the outer peripheral surface 43c, the third welded portion 83 can be disposed at a certain distance in the circumferential direction from the first welded portion 81. As a result, the first welded portion 81 and the third welded portion 83 can easily reinforce the radial outer surface of the stator core 41 over a relatively wide range. Therefore, deformation of the stator core 41 can be more effectively suppressed. In addition, when the second welded portion 82 is provided, the third welded portion 83 can easily be provided in the circumferential middle portion between the first welded portion 81 and the second welded portion 82. Therefore, the first welded portion 81, the second welded portion 82, and the third welded portion 83 can easily and suitably reinforce the radial outer surface of the stator core 41 over a wider range. Therefore, deformation of the stator core 41 can be more suitably suppressed. The same applies to the third welded portion 83 provided on the fourth side surface 45b of the second protruding portion 45, the third welded portion 83 provided on the side surface on the other circumferential side of the third protruding portion 46, and the third welded portion 83 provided on the side surface on the other circumferential side of the fourth protruding portion 47.

[0104] Further, according to the present embodiment, the third welded portion 83 is located radially outside a portion of the core back 43a that is located between the flux barrier portions 48 adjacent to each other in the circumferential direction. Therefore, compared to a case where the third welded portion 83 is located radially outside the flux barrier portion 48, it is easy to increase the radial distance between the radially outer surface of the stator core 41 and the flux barrier portion 48, and the distance between the flux barrier portion 48 and the third welded portion 83. This makes it easy to ensure a magnetic path through which magnetic flux flows between the radially outer surface of the stator core 41 and the flux barrier portion 48, and between the flux barrier portion 48 and the third welded portion 83. Therefore, it is easy to suppress the third welded portion 83 from affecting the magnetic flux flowing through the core back 43a. Therefore, even if the third welded portion 83 is provided, it is possible to suppress the magnetic characteristics of the rotating electric machine 10 from deteriorating. Therefore, it is possible to further suppress the deformation of the stator core 41 by providing the third welded portion 83 while suppressing the output of the rotating electric machine 10 from deteriorating.

[0105] Furthermore, according to this embodiment, the third welded portion 83 is located radially outside the tooth 43b. Therefore, similar to the above-described second welded portion 82, the third welded portion 83 can be further prevented from affecting the magnetic flux flowing through the core back 43a. This can further prevent the magnetic characteristics of the rotating electric machine 10 from deteriorating.

[0106] Furthermore, according to this embodiment, the multiple welds 80 are arranged rotationally symmetrically around the central axis J on the radial outer surface of the stator core 41. Therefore, the multiple welds 80 can reinforce the radial outer surface of the stator core 41 in a well-balanced manner over the entire circumference. This can further suppress deformation of the stator core 41. Furthermore, even if multiple welds 80 are provided, it is possible to suppress imbalance of the mass of the stator core 41 in the circumferential direction.

[0107] Furthermore, according to this embodiment, the multiple welds 80 are disposed at equal angles along the circumferential direction. Therefore, the multiple welds 80 can reinforce the radially outer surface of the stator core 41 all around in a more suitable and balanced manner. This can more suitably prevent the stator core 41 from being deformed. Furthermore, even if multiple welds 80 are provided, it can more suitably prevent the circumferential balance of the mass of the stator core 41 from being lost.

[0108] Moreover, according to this embodiment, the welded portion 80 extends in the axial direction. Therefore, the portion of the stator core 41 reinforced by the welded portion 80 can be enlarged in the axial direction. This allows the strength of the stator core 41 to be further improved by the welded portion 80. In addition, the multiple plate members 41a stacked in the axial direction can be suitably fixed to each other by the welded portion 80.

[0109] The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical idea of ​​the present invention. As long as the welded portion includes the first welded portion, it is not necessary to include at least one of the second welded portion and the third welded portion, and it may include a fourth welded portion different from the second welded portion and the third welded portion. The second welded portion may be provided at any position as long as it is provided on the outer peripheral surface of the core back. The third welded portion may be provided at any position as long as it is provided on a portion of the radial outer surface of the protrusion whose circumferential position is different from that of the hole. The shape of the welded portion is not particularly limited.

[0110] The multiple welds may be arranged on the radial outer surface of the stator core with rotational symmetry other than four-fold symmetry around the central axis. When N is an integer of 2 or more, the multiple welds may be arranged on the radial outer surface of the stator core with N-fold symmetry around the central axis. The multiple welds may not be arranged on the radial outer surface of the stator core with rotational symmetry around the central axis. The multiple welds may not be arranged at equal angles along the circumferential direction. The number of welds is not particularly limited as long as it is one or more. In addition, the welds 80 do not need to extend from one axial end of the stator core 41 to the other axial end. For example, the welds may be arranged in a row in the axial direction. The welds 80 may be provided only at the one axial end and the other axial end of the stator core 41.

[0111] The hole portion may be provided in the core back. In this case, the first welded portion may be provided on the outer peripheral surface of the core back. Also, in this case, the stator core may not have a protrusion. The hole portion may be any hole as long as it extends in the axial direction. The hole portion may be a hole having a bottom at one end in the axial direction. In this case, the hole portion may be a screw hole into which a bolt that fixes the stator core is fastened. The number of the hole portions is not particularly limited as long as it is one or more. The protrusion portion of the stator core may have any shape. The number and shape of the flux barrier portions are not particularly limited. The flux barrier portion may not be provided.

[0112] The rotating electric machine to which the present invention is applied is not limited to a motor, and may be a generator. The use of the rotating electric machine is not particularly limited. For example, the rotating electric machine may be mounted on a moving body for a purpose other than rotating an axle, or may be mounted on equipment other than a moving body. The attitude of the rotating electric machine when used is not particularly limited. The central axis of the rotating electric machine may extend in the vertical direction. The moving body on which the rotating electric machine is mounted is not limited to a vehicle, and may be an aircraft or a ship. The moving body may be a manned moving body or an unmanned moving body. The configurations and methods described in this specification above can be combined as appropriate within a range that does not contradict each other. [Explanation of symbols]

[0113] 10... rotating electric machine, 30... rotor, 40... stator, 41... stator core, 43a... core back, 43b... teeth, 43c... outer peripheral surface, 44... first protrusion (protrusion), 44a... first side surface (inclined surface), 45... second protrusion (protrusion), 45b... fourth side surface (inclined surface), 46... third protrusion (protrusion), 47... fourth protrusion (protrusion), 48... flux barrier portion, 49... protrusion, 49a... hole portion, 60... transmission device, 64... axle, 80... welded portion, 81... first welded portion, 82... second welded portion, 83... third welded portion, 100... drive device, 1000... moving body (vehicle), IL1... virtual line, J... center axis, P1a, P2b... connection portion, TL1a, TL2b... tangent line

Claims

1. The rotor includes a stator core having an annular core back surrounding a central axis and a plurality of teeth extending radially inward from the core back, The core back has a flux barrier portion, The stator core is a hole portion provided in a radially outer portion of the stator core and extending in an axial direction; a welded portion provided on a radially outer surface of the stator core; a protruding portion protruding radially outward from an outer circumferential surface of the core back; having The hole is provided in the protrusion, The weld portion includes a first weld portion provided on a radially outer surface of the stator core on a virtual line connecting the hole portion and the central axis as viewed in the axial direction, The first weld portion is provided on a radially outer surface of the protrusion, A stator, wherein a distance between the flux barrier portion and the hole portion is greater than a distance between the first weld portion and the hole portion when viewed in the axial direction.

2. The stator according to claim 1 , wherein the welded portion includes a second welded portion provided on an outer circumferential surface of the core back.

3. The core back has a plurality of the flux barrier portions arranged at intervals in a circumferential direction, The stator according to claim 2 , wherein the second welded portion is located radially outward of a portion of the core back that is located between the flux barrier portions adjacent to each other in the circumferential direction.

4. A stator core having an annular core back surrounding a central axis and a plurality of teeth extending radially inward from the core back, The core back has a plurality of flux barrier portions spaced apart in a circumferential direction, The stator core is a hole portion provided in a radially outer portion of the stator core and extending in an axial direction; a welded portion provided on a radially outer surface of the stator core; a protruding portion protruding radially outward from an outer circumferential surface of the core back; having The hole is provided in the protrusion, The welded portion is a first weld portion provided on a radially outer surface of the stator core on a virtual line connecting the hole portion and the central axis as viewed in the axial direction; A second welded portion provided on an outer peripheral surface of the core back; Including, The first weld portion is provided on a radially outer surface of the protrusion, The second welded portion is located radially outward of a portion of the core back that is located between the flux barrier portions adjacent to each other in the circumferential direction.

5. The stator according to claim 2 , wherein the second welded portion is located radially outward of the teeth.

6. The stator according to claim 1 , wherein the welded portion includes a third welded portion provided on a radially outer surface of the protrusion at a portion whose circumferential position is different from a circumferential position of the hole.

7. The core back has a cylindrical outer peripheral surface, the protruding portion has an inclined surface extending radially outward and toward one circumferential side from an outer circumferential surface of the core back, When viewed in the axial direction, the inclined surface extends along a tangent line that contacts a connection portion to which a radially inner end portion of the outer circumferential surface of the core back is connected, The stator according to claim 6 , wherein the third welded portion is provided at a circumferential end portion of the inclined surface that is closer to an outer circumferential surface of the core back.

8. A stator core having an annular core back surrounding a central axis and a plurality of teeth extending radially inward from the core back, The core back has a cylindrical outer circumferential surface, The stator core is a hole portion provided in a radially outer portion of the stator core and extending in an axial direction; a welded portion provided on a radially outer surface of the stator core; a protruding portion protruding radially outward from an outer circumferential surface of the core back; having The hole is provided in the protrusion, The welded portion is a first weld portion provided on a radially outer surface of the stator core on a virtual line connecting the hole portion and the central axis as viewed in the axial direction; a third welded portion provided on a portion of the radially outer surface of the protrusion, the portion being located at a circumferential position different from the circumferential position of the hole; Including, The first weld portion is provided on a radially outer surface of the protrusion, the protruding portion has an inclined surface extending radially outward and toward one circumferential side from an outer circumferential surface of the core back, When viewed in the axial direction, the inclined surface extends along a tangent line that contacts a connection portion to which a radially inner end portion of the outer circumferential surface of the core back is connected, The third welded portion is provided at a circumferential end of the inclined surface that is closer to an outer circumferential surface of the core back.

9. The core back has a plurality of the flux barrier portions arranged at intervals in a circumferential direction, The stator according to claim 6 , wherein the third welded portion is located radially outward of a portion of the core back that is located between the flux barrier portions adjacent to each other in the circumferential direction.

10. A stator core having an annular core back surrounding a central axis and a plurality of teeth extending radially inward from the core back, The core back has a plurality of flux barrier portions spaced apart in a circumferential direction, The stator core is a hole portion provided in a radially outer portion of the stator core and extending in an axial direction; a welded portion provided on a radially outer surface of the stator core; a protruding portion protruding radially outward from an outer circumferential surface of the core back; having The hole is provided in the protrusion, The welded portion is a first weld portion provided on a radially outer surface of the stator core on a virtual line connecting the hole portion and the central axis as viewed in the axial direction; a third welded portion provided on a portion of the radially outer surface of the protrusion, the portion being located at a circumferential position different from the circumferential position of the hole; Including, The first weld portion is provided on a radially outer surface of the protrusion, The third welded portion is located radially outside a portion of the core back that is located between the flux barrier portions adjacent to each other in the circumferential direction.

11. The stator according to claim 6 , wherein the third welded portion is located radially outward of the tooth.

12. The welded portion is provided in plurality, The stator according to claim 1 , wherein the welds are arranged on a radially outer surface of the stator core in a rotational symmetric manner around the central axis.

13. The stator according to claim 12 , wherein the welds are arranged at equal angles along a circumferential direction.

14. A stator as claimed in any one of claims 1 to 13, wherein the welds extend in an axial direction.

15. A stator according to any one of claims 1 to 14; a rotor facing the stator with a gap therebetween; A rotating electric machine comprising:

16. A drive device mounted on a vehicle, A rotating electric machine according to claim 15; a transmission device connected to the rotating electric machine and configured to transmit rotation of the rotating electric machine to an axle of the vehicle; A drive device comprising:

17. A moving body comprising the rotating electric machine according to claim 15.

Images