Stator, rotary electric machine, drive device, and moving body

Abstract

Provided is a stator, a rotary electric machine, a drive device, and a moving body. One aspect of the stator of the present invention includes a stator core portion having a ring-shaped core back that surrounds a center axis and a plurality of teeth that extend from the core back toward a radially inner side. The stator core portion has a bore portion that is provided to a radially outer portion of the stator core portion and extends along an axial direction, and a weld portion that is provided to a radially outer surface of the stator core portion. The weld portion includes a first weld portion that is provided to an imaginary line that connects the bore portion and the center axis when viewed in the axial direction in the radially outer surface of the stator core portion.

Description

TECHNICAL FIELD

[0001] The present application relates to a stator, a rotary electric machine, a drive device, and a moving body. BACKGROUND

[0002] A stator core fixed by a bolt inserted into a bore portion is known. For example, a stator core for a motor for vehicle use is described in Patent Literature 1.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2019-106813

[0006] When a stator core is fixed by a bolt, a force in a screwing direction generated when the bolt is tightened is applied to the stator core. Therefore, the stator core can be deformed. In particular, in a case where the stator core is constituted by a plurality of plate members laminated, the plate members can be deformed. SUMMARY

[0007] In view of the above, one object of the present application is to provide a stator, a rotary electric machine, a drive device, and a moving body having a structure capable of suppressing deformation of a stator core.

[0008] One aspect of the stator of the present application includes a stator core having a ring-shaped core back surrounding a center axis and a plurality of pole teeth extending from the core back toward a radially inner side. The stator core has a bore portion provided to a radially outer portion of the stator core and extending along an axial direction, and a weld portion provided to a radially outer surface of the stator core. The weld portion includes a first weld portion provided to an imaginary line connecting the bore portion and the center axis when viewed in the axial direction in the radially outer surface of the stator core.

[0009] One aspect of the rotary electric machine of the present application includes the stator, and a rotor opposing the stator across a gap.

[0010] One aspect of the drive device of the present application is a drive device installed in a vehicle, including the rotary electric machine, and a transmission device connected to the rotary electric machine and transmitting rotation of the rotary electric machine to an axle of the vehicle.

[0011] One aspect of the moving body of the present application includes the rotary electric machine.

[0012] According to one aspect of the present application, deformation of a stator core can be suppressed in a stator, a rotary electric machine, a drive device, and a moving body. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a view that schematically shows a mobile body of an embodiment.

[0014] Figure 2 is a schematic configuration view that schematically shows a drive device of an embodiment.

[0015] Figure 3 is a sectional view that shows a part of a drive device of an embodiment, which is a III-III sectional view in Figure 2

[0016] Figure 4 is a view that shows a stator and a refrigerant supply portion of an embodiment from an upper side. Figure 5 is a perspective view that shows a stator core portion and a refrigerant supply portion of an embodiment.

[0017] Figure 6 is a view that shows a stator core portion of an embodiment from an axial other side.

[0018] (Symbol Explanation)

[0019] 10 rotating electric machine; 30 rotor; 40 stator; 41 stator core portion; 43a core back; 43b pole tooth; 43c outer peripheral surface; 44 first protruding portion (protruding portion); 44a first side surface (inclined surface); 45 second protruding portion (protruding portion); 45b fourth side surface (inclined surface); 46 third protruding portion (protruding portion); 47 fourth protruding portion (protruding portion); 48 magnetic flux blocking portion; 49 protruding portion; 49a orifice 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 mobile body (vehicle); IL1 imaginary line; J center axis; P1a, P2b connecting portion; TL1a, TL2b tangent line. DETAILED DESCRIPTION

[0020] As shown in Figure 1 , a mobile body 1000 of the present embodiment is a vehicle that uses a motor of a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an electric vehicle (EV), or the like as a power source. The mobile body 1000 includes a vehicle body 110, a drive device 100 that rotates a wheel of the mobile body 1000, and a battery 120 that supplies electric power to the drive device 100. The drive device 100 and the battery 120 are housed inside the vehicle body 110.

[0021] ​In the following description, the vertical direction is defined and explained based on the positional relationship of the moving body 1000, including the drive device 100, located on the horizontal road surface R. That is, the relative positional relationship related to the vertical direction described in the following embodiments is satisfied at least when the moving body 1000, including the drive device 100, is located on the horizontal road surface R.

[0022] In the accompanying drawings, the XYZ coordinate system is appropriately represented as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper vertical direction, and the -Z side is the lower vertical direction. In the following description, the upper vertical direction is simply referred to as the "upper side," and the lower vertical direction is simply referred to as the "lower side." The X-axis direction is orthogonal to the Z-axis direction and is the front-rear direction of the moving body 1000. In the following embodiment, 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 orthogonal to both the X-axis and Z-axis directions and is the left-right direction of the moving body 1000, i.e., the vehicle width direction. In the following embodiment, 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 and left-right directions are horizontal directions orthogonal to the vertical direction.

[0023] Furthermore, the positional relationship in the front-back direction is not limited to the positional relationship in the following embodiment. It can also be that the +X side is the rear side of the moving body 1000 and the -X side is 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, "parallel direction" also includes a generally parallel direction, and "orthogonal direction" also includes a generally orthogonal direction.

[0024] The central axis J, appropriately represented in the diagram, is an imaginary line extending along a direction intersecting the vertical direction. More specifically, the central axis J extends along the Y-axis direction, which is orthogonal to the vertical direction, i.e., the left-right direction of the moving body 1000. In the following description, unless otherwise specified, the direction parallel to the central axis J will be simply referred to as the "axial direction," the radial direction centered on the central axis J will be simply referred to as the "radial direction," and the circumferential direction centered on the central axis J, i.e., the direction around the central axis J, will be simply referred to as the "circumferential direction." The left side (+Y side) of the axial direction will be referred to as "one side of the axial direction," and the right side (-Y side) of the axial direction will be referred to as "the other side of the axial direction."

[0025] In the diagrams, the arrow θ represents the circumferential direction. In the following explanation, the side of the circumferential direction that moves clockwise around the central axis J when viewed from the right, i.e., the side in which the arrow θ points (+θ side), is called the "circumferential side". The side of the circumferential direction that moves counterclockwise around the central axis J when viewed from the right, i.e., the side opposite to the side in which the arrow θ points (-θ side), is called the "circumferential side".

[0026] Figure 2 The drive device 100 shown in this embodiment is a drive device installed on a moving body 1000, which is a vehicle, and that rotates the axle 64 of the moving body 1000. For example... Figure 2 As shown, the drive unit 100 includes a rotary motor 10 and a transmission device 60. That is, the moving body 1000 includes a rotary motor 10 and a transmission device 60. The transmission device 60 is connected to the rotary motor 10 and transmits the rotation of the rotary motor 10, i.e., the rotation of the rotor 30 described later, to the axle 64 of the moving body 1000. In this embodiment, the transmission device 60 has a gear housing 61, a reduction gear 62 connected to the rotary motor 10, and a differential gear 63 connected to the reduction gear 62.

[0027] The gear housing 61 internally houses the reduction gear 62, the differential gear 63, and the oil O. The oil O is stored in the lower region within the gear housing 61. The oil O circulates within the refrigerant flow path 90, described later. The oil O serves as a refrigerant for cooling the rotary motor 10. Furthermore, the oil O serves as lubricating oil for the reduction gear 62 and the differential gear 63. As for the oil O, for example, to perform the functions of both refrigerant and lubricating oil, it is preferable to use an oil with a relatively low viscosity, similar to automatic transmission fluid (ATF).

[0028] The differential 63 has a gear ring 63a. The torque output from the rotary motor 10 is transmitted to the gear ring 63a via the reduction gear 62. The lower end of the gear ring 63a is immersed in oil O stored in the gear housing 61. The oil O is lifted up by the rotation of the gear ring 63a. The lifted oil O is supplied to the reduction gear 62 and the differential 63, for example, as lubricating oil.

[0029] The rotary motor 10 is the part that drives the drive device 100. The rotary motor 10 is located, for example, on the other side of the transmission device 60 along its axial direction. In this embodiment, the rotary motor 10 is a motor. The rotary motor 10 includes a motor housing 20, a rotor 30 that can rotate about a central axis J, a stator 40, and a refrigerant supply unit 50.

[0030] The motor housing 20 is a casing that houses the rotor 30 and stator 40. The motor housing 20 is axially connected to the other side of the gear housing 61. The motor housing 20 has a peripheral wall portion 21, a partition wall portion 22, and a cover portion 23. The peripheral wall portion 21 and the partition wall portion 22 are, for example, part of the same single component. The cover portion 23 is, for example, separate from the peripheral wall portion 21 and the partition wall portion 22.

[0031] The peripheral wall portion 21 is cylindrical, surrounding the central axis J and opening to the other axial side. A partition wall portion 22 is connected to the axial end of the peripheral wall portion 21. The partition wall portion 22 axially separates the interior of the motor housing 20 and the interior of the gear housing 61. The partition wall portion 22 has a partition opening 22a connecting the interior of the motor housing 20 and the interior of the gear housing 61. A bearing 34 is held in the partition wall portion 22. A cover portion 23 is fixed to the axial end of the peripheral wall portion 21. The cover portion 23 seals the axial opening of the peripheral wall portion 21. A bearing 35 is held in the cover portion 23.

[0032] like Figure 3 As shown, 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 inward surface of the support portion 24 is an arc-shaped curved surface centered on the central axis J. The radially inward surface of the support portion 24 contacts the outer circumferential surface 43c of the stator core body 43 of the stator 40, which will be described later. Thus, the support portion 24 supports the stator 40 from the radially outward. The support portion 24 extends axially. Although not shown in the figure, multiple support portions 24 are provided at intervals along the circumferential direction.

[0033] In this embodiment, the support portion 24 includes a relative support portion 24a, which is configured to face one circumferential side (+θ side) of the refrigerant supply portion 50. The relative support portion 24a is located on the upper side of the stator 40. The relative support portion 24a protrudes downward. The relative support portion 24a has a through groove 24b that extends circumferentially through the relative support portion 24a. The through groove 24b is recessed from the radially inner side surface of the relative support portion 24a to the radially outer side. Figure 4 As shown, in this embodiment, multiple through slots 24b are provided at intervals in the axial direction. For example, two through slots 24b are provided. The end of the stator core body 43 located on the opposite axial side from the axial side of the support portion 24a is located on the other axial side. The portion of the inner circumferential surface of the motor housing 20 located on the axial side of the support portion 24a is radially opposed to the outer circumferential surface 43c of the stator core body 43 with a gap.

[0034] like Figure 2As shown, the rotor 30 and stator 40 are positioned opposite each other with a gap. The rotor 30 has a shaft 31 and a rotor body 32. Although not shown in the figure, 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.

[0035] Shaft 31 is rotatable about its central axis J. Shaft 31 is supported by bearings 34 and 35 to enable rotation. In this embodiment, shaft 31 is a hollow shaft. Shaft 31 is cylindrical, extending axially about its central axis J. A bore 33 is provided in shaft 31, connecting the interior of shaft 31 to its exterior. Shaft 31 extends across the interior of motor housing 20 and gear housing 61. One axial end of shaft 31 protrudes into the interior of gear housing 61. A speed reduction device 62 is connected to the axial end of shaft 31.

[0036] The stator 40 is radially opposed to the rotor 30 with a gap. 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.

[0037] The stator core 41 is annular, surrounding the central axis J of the rotary motor 10. The stator core 41 is located radially outside the rotor 30. The stator core 41 surrounds the rotor 30. Figure 4 As shown, the stator core 41 is, for example, constructed by stacking multiple plate members 41a, such as electromagnetic steel plates, in the axial direction. Adjacent plate members 41a in the axial direction are, for example, partially riveted together and thus fixed to each other. Figure 5 and Figure 6 As shown, in this embodiment, the stator core 41 has a shape that is symmetrical about the central axis J, rotating four times.

[0038] The stator core 41 has a stator core body 43 and a protrusion 49. The stator core body 43 is annular, surrounding the rotor 30. More specifically, the stator core body 43 is cylindrical, opening on both sides axially around the central axis J. The stator core body 43 has a cylindrical outer peripheral surface 43c surrounding the rotor 30. In this embodiment, the outer peripheral surface 43c is cylindrical, centered on the central axis J. The outer peripheral surface 43c constitutes a part of the outer peripheral surface of the stator core 41. In this embodiment, the outer peripheral surface of the stator core 41, i.e., the radially outer surface of the stator core 41, is formed by the outer peripheral surface 43c and the radially outer surface of the protrusion 49. Figure 3 As shown, the outer peripheral surface 43c is supported radially outward by a support portion 24 provided on the inner peripheral surface of the motor housing 20. The outer peripheral surface 43c is configured to be radially opposed to the portion of the inner peripheral surface of the motor housing 20 where the support portion 24 is not provided, with a gap between them.

[0039] likeFigure 3 , Figure 5 and Figure 6 As shown, the stator core body 43 has a cylindrical core back 43a extending axially and a plurality of pole teeth 43b extending radially inward from the core back 43a. That is, the stator core 41 has a core back 43a and a plurality of pole teeth 43b. The core back 43a is annular in shape surrounding 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 pole teeth 43b are evenly spaced throughout the circumference.

[0040] In this embodiment, the core back 43a has a plurality of flux blocking portions 48 arranged at intervals in the circumferential direction. In this specification, a "flux blocking portion" refers to a portion that can suppress the flow of magnetic flux. That is, magnetic flux is difficult to pass through the flux blocking portion. The flux blocking portion is not particularly limited as long as it can suppress the flow of magnetic flux; it may include a gap portion or a non-magnetic portion such as a resin portion. In this embodiment, the flux blocking portion 48 is a gap portion formed by a hole penetrating the core back 43a along the axial direction. The hole constituting the flux blocking portion 48 is, for example, a circular hole.

[0041] Multiple flux blocking portions 48 are arranged at equal intervals along the circumference. Each flux blocking portion 48 is disposed radially outside a groove portion formed between adjacent pole teeth 43b in the circumferential direction. The inner diameter of the flux blocking portion 48 is less than or equal to the interval between adjacent pole teeth 43b in the circumferential direction, i.e., the circumferential dimension of the groove portion. In this embodiment, the flux blocking portion 48 is located at the center radially between the inner circumferential surface and the outer circumferential surface 43b of the core back 43a.

[0042] The protrusion 49 protrudes radially outward from the outer peripheral surface 43c of the core back 43a. The protrusion 49 is a fixing part that is fixed to the motor housing 20. Figure 5 As shown, the protrusion 49 extends axially. For example, the protrusion 49 extends from one end of the stator core body 43 along its axial direction to the other end of the stator core body 43 along its axial direction. Multiple protrusions 49 are spaced apart in the circumferential direction. For example, four protrusions 49 are provided.

[0043] 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, second protrusion 45, third protrusion 46, and fourth protrusion 47 are spaced apart from each other in the circumferential direction. In this embodiment, the first protrusion 44 and second protrusion 45 are located above the central axis J. In this embodiment, the third protrusion 46 and fourth protrusion 47 are located below the central axis J. The first protrusion 44, second protrusion 45, third protrusion 46, and fourth protrusion 47 are, for example, equally spaced around the entire circumference. The first protrusion 44, second protrusion 45, third protrusion 46, and fourth protrusion 47 are, for example, identical in shape. Therefore, in the following description, the shape of the protrusions 49 other than the first protrusion 44 is sometimes omitted. In this embodiment, each protrusion 49 has an asymmetrical shape in the circumferential direction.

[0044] A first protrusion 44 is located at the upper end of the front portion of the stator core body 43. The first protrusion 44 protrudes obliquely forward and upward from the stator core body 43. A second protrusion 45 is located at the upper end of the rear portion of the stator core body 43. The second protrusion 45 protrudes obliquely backward and upward from the stator core body 43. A third protrusion 46 is located at the lower end of the rear portion of the stator core body 43. The third protrusion 46 protrudes obliquely backward and downward from the stator core body 43. A fourth protrusion 47 is located at the lower end of the front portion of the stator core body 43. The fourth protrusion 47 protrudes obliquely forward and downward from the stator core body 43.

[0045] like Figure 3 As shown, the first protrusion 44 is located on the circumferential side (+θ side) of the refrigerant supply section 50. The first protrusion 44 is located on the circumferential side further than the relative support section 24a. In this embodiment, the first protrusion 44 is located on the circumferential side further than the upper vertex VP of the stator core body 43. The vertex VP is the uppermost portion of the outer circumferential surface 43c of the stator core body 43 when viewed axially. The vertex VP is the portion of the outer circumferential surface 43c of the stator core body 43 that intersects with the imaginary line CL extending vertically through the central axis J. The vertex VP is supported from above, for example, by the relative support section 24a. In this embodiment, the radially outer end of the first protrusion 44 is located on the lower side than the vertex VP.

[0046] The first protrusion 44 is disposed separately from the inner circumferential surface of the motor housing 20. The circumferential dimension of the first protrusion 44 decreases as it moves radially outward. The outermost radial end of the first protrusion 44 has an arc shape that bulges radially outward when viewed axially. The first side surface 44a of the first protrusion 44 facing the other circumferential side (-θ side) is positioned as an inclined surface facing one circumferential side (+θ side) as it moves radially outward from the outer circumferential surface 43c of the stator core body 43. That is, the first protrusion 44 has a first side surface 44a as an inclined surface extending radially outward and circumferentially to one side from the outer circumferential surface 43c of the core back 43a. In this embodiment, the first side surface 44a faces upward and slightly forward.

[0047] The 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 axially from the central axis J, the first side surface 44a extends along a tangent TL1a, which is tangent to the connecting portion P1a in the outer peripheral surface 43c of the core back 43a, where the radially inner end of the first side surface 44a is connected. In this embodiment, the connecting portion P1a is located forward and downward from the vertex VP. When viewed axially, the tangent TL1a is inclined relative to the front-rear direction (X-axis direction). The tangent TL1a is positioned so that it points downward as it moves forward.

[0048] The first side surface 44a is smoothly connected to the outer peripheral surface 43c of the stator core body 43. The first side surface 44a extends in a straight line when viewed axially, for example. When viewed axially, the first side surface 44a extends obliquely downward from the connecting portion P1a. In this embodiment, the first side surface 44a is positioned downward as it moves away from the first supply port 54 (described later) in the circumferential direction. The first side surface 44a is positioned downward as it moves towards the front of the movable body 1000 on which the drive device 100 is mounted.

[0049] The second side surface 44b of the first protrusion 44, facing one circumferential side (+θ side), is positioned as an inclined surface that faces the other circumferential side (-θ side) as it moves radially outward from the outer peripheral surface 43c of the stator core body 43. In this embodiment, the second side surface 44b faces obliquely downward to the front.

[0050] The radially inner end of the second side surface 44b is connected to the outer peripheral surface 43c of the stator core body 43. Viewed axially from the central axis J, the second side surface 44b extends in a direction inclined radially outward than the tangent TL1b, which is tangent to the connecting portion P1b in the outer peripheral surface 43c of the stator core body 43, where the radially inner end of the second side surface 44b is connected. In this embodiment, the connecting portion P1b is located forward and downward than the connecting portion P1a. The tangent TL1b is inclined relative to the front-rear direction when viewed axially. The tangent TL1b is positioned so that it faces downward as it moves forward. The slope of the tangent TL1b relative to the front-rear direction is greater than the slope of the tangent TL1a relative to the front-rear direction.

[0051] The second side surface 44b is smoothly connected to the outer peripheral surface 43c of the stator core body 43. The second side surface 44b extends in a straight line when viewed from the axial direction, for example. When viewed from the axial direction, the second side surface 44b extends upward and slightly forward from the connecting part P1b.

[0052] The second protrusion 45 is located on the other side (-θ side) of the refrigerant supply section 50 in the circumferential direction. The second protrusion 45 is located on the other side of the circumferential direction compared to the opposing support section 24a. In this embodiment, the second protrusion 45 is located on the other side of the circumferential direction compared to the upper vertex VP of the stator core body 43. In this embodiment, the radially outer end of the second protrusion 45 is located above the radially outer end of the first protrusion 44. For example, the upper end of the second protrusion 45 is located above the vertex VP.

[0053] The third side surface 45a of the second protrusion 45, facing one circumferential side (+θ side), is positioned as an inclined surface that faces the other circumferential side (-θ side) as it moves radially outward from the outer peripheral surface 43c of the stator core body 43. In this embodiment, the third side surface 45a faces upward and slightly forward.

[0054] The radially inner end of the third side surface 45a is connected to the outer peripheral surface 43c of the stator core body 43. Viewed axially from the central axis J, the third side surface 45a extends in a direction inclined radially outward from the tangent line TL2a, which is tangent to the connecting portion P2a in the outer peripheral surface 43c of the stator core body 43, where the radially inner end of the third side surface 45a is connected. In this embodiment, the connecting portion P2a is located rearward and lower than the vertex VP. The tangent line TL2a is inclined relative to the front-rear direction when viewed axially. The tangent line TL2a is positioned upward as it moves towards the front.

[0055] The third side surface 45a is smoothly connected to the outer peripheral surface 43c of the stator core body 43. The third side surface 5a extends in a straight line when viewed from the axial direction, for example. When viewed from the axial direction, the third side surface 45a extends obliquely upward and rearward from the connecting part P2a.

[0056] The fourth side surface 45b of the second protrusion 45, facing the other side (-θ side) in the circumferential direction, is positioned as an inclined surface facing one side (+θ side) in the circumferential direction as it moves radially outward from the outer peripheral surface 43c of the stator core body 43. That is, the second protrusion 45 has a fourth side surface 45b, which is an inclined surface extending radially outward and circumferentially from the outer peripheral surface 43c of the core back 43a. In this embodiment, the fourth side surface 45b faces obliquely upward towards the rear.

[0057] 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. Viewed axially from the central axis J, the fourth side surface 45b extends along a tangent TL2b, which is tangent to the connecting portion P2b in the outer peripheral surface 43c of the stator core body 43, where the radially inner end of the fourth side surface 45b is connected. In this embodiment, the connecting portion P2b is located rearward and lower than the connecting portion P2a. The tangent TL2b is inclined relative to the front-rear direction when viewed axially. The tangent TL2b is positioned upward as it moves towards the front. The slope of the tangent TL2b relative to the front-rear direction is greater than the slope of the tangent TL2a relative to the front-rear direction.

[0058] The fourth side surface 45b is smoothly connected to the outer peripheral surface 43c of the stator core body 43. The fourth side surface 45b extends in a straight line when viewed from the axial direction, for example. When viewed from the axial direction, the fourth side surface 45b extends upward and slightly forward from the connecting part P2b.

[0059] The stator core 41 has an aperture 49a, which is disposed on the radially outer portion of the stator core 41. The radially outer portion of the stator core 41 is the portion of the stator core 41 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 protrusion 49. In this embodiment, the aperture 49a is disposed on the protrusion 49. Each protrusion 49 is provided with one aperture 49a.

[0060] The orifice 49a extends axially. In this embodiment, the orifice 49a is a through hole that passes through the protrusion 49 axially. The orifice 49a is, for example, a circular hole. A bolt 25 extending axially passes through the orifice 49a. Although not shown in the figure, the bolt 25 passes through the orifice 49a from, for example, the other side axially (-Y side) and is screwed into a female threaded hole provided in the motor housing 20. Thus, the protrusion 49 is fixed to the motor housing 20 by the bolt 25. A washer 26 is provided between the protrusion 49 and the bolt 25. The washer 26 is a plate with its plate surface facing axially, and it is an annular shape surrounding the bolt 25.

[0061] like Figure 5 As shown, the stator core 41 has a welding portion 80, which is provided on the radially outer side surface of the stator core 41. In this embodiment, the welding portion 80 extends axially. More specifically, the welding portion extends from one end of the stator core 41 along one axial direction to the other end along the axial direction. The welding portion 80 is formed by welding a portion of the radially outer side surface of the stator core 41. In this embodiment, the welding portion 80 is formed by welding the bottom surface of the welding groove 41b provided on the radially outer side surface of the stator core 41.

[0062] The welding groove 41b is recessed radially inward from the radially outer side of the stator core 41. The welding groove 41b extends axially. More specifically, the welding portion 41b extends from one end of the stator core 41 along the axial direction to the other end. The welding groove 41b is open on both axial sides. The bottom surface of the welding groove 41b is the radially outer surface of the inner surface of the welding groove 41b. The welding method for fabricating the welding portion 80 is not particularly limited; it can be either arc welding or laser welding. The welding portion 80 is provided across multiple plate members 41a, fixing the multiple plate members 41a to each other. In this embodiment, multiple welding portions 80 are provided.

[0063] Multiple welded sections 80 are arranged at intervals along the circumference. For example... Figure 6 As shown, in this embodiment, a plurality of welded portions 80 are arranged at equal angles along the circumferential direction. That is, the circumferential angle between adjacent welded portions 80 on the radially outer surface of the stator core 41 is... All welded portions 80 are identical to each other. In this embodiment, twelve welded portions 80 are provided. The twelve welded portions 80 are respectively located at positions that divide the radially outer surface of the stator core portion 41 into twelve equal parts in the circumferential direction. In this embodiment, the angle... It's 30°.

[0064] A plurality of welded portions 80 are configured to be rotationally symmetrical about the central axis J on the radially outer surface of the stator core 41. In this embodiment, the plurality of welded portions 80 are configured to be symmetrically rotated four times about the central axis J on the radially outer surface of the stator core 41. That is, when the stator core 41 is rotated 90° about the central axis J, each welded portion 80 in the rotated stator core 41 overlaps with the position of each welded portion 80 in the stator core 41 before rotation. In this embodiment, the plurality of welded portions 80 includes a first welded portion 81, a second welded portion 82, and a third welded portion 83.

[0065] The first weld portion 81 is a weld portion 80 disposed on an imaginary line IL1 that passes through the orifice portion 49a and the central axis J when viewed axially, located on the radially outer side of the stator core portion 41. The imaginary line IL1, when viewed axially, passes through the center of the orifice portion 49a and extends radially along the central axis J. In this embodiment, the imaginary line IL1, when viewed axially, passes through the circumferential center of a pole tooth 43b and the circumferential center between adjacent flux blocking portions 48 in the circumferential direction. In this embodiment, the first weld portion 81 is disposed on the radially outer side of the protrusion 49. More specifically, the first weld portion 81 is disposed on the radially outer side of the end of the protrusion 49. The first weld portion 81 is located radially outer of the orifice portion 49a.

[0066] In this embodiment, a plurality of first welding portions 81 are provided. Each of the first protrusion 44, the second protrusion 45, the third protrusion 46, and the fourth protrusion 47 is provided with one first welding portion 81. That is, in this embodiment, a total of four first welding portions 81 are provided.

[0067] like Figure 3 As shown, when viewed axially, the distance L2 between the flux blocking portion 48 and the orifice portion 49a is greater than the distance L1 between the first weld portion 81 and the orifice portion 49a. Distance L1 is the shortest distance between the first weld portion 81 and the orifice portion 49a where the protrusion 49 of the first weld portion 81 is located. Distance L1 is the radial distance between the first weld portion 81 and the orifice portion 49a. Distance L2 is the shortest distance between the orifice portion 49a and the nearest flux blocking portion 48 to the orifice portion 49a. Distance L2 is, for example, more than twice the distance L1.

[0068] The second welding part 82 is a welding part 80 provided on the outer peripheral surface 43c of the core back 43a. For example... Figure 6As shown, in this embodiment, a plurality of second welding portions 82 are provided. The second welding portions 82 are respectively provided in the portion of the outer peripheral surface 43c located between adjacent protrusions 49 in the circumferential direction. More specifically, the second welding portions 82 are respectively provided in the portion of the outer peripheral surface 43c located circumferentially between the first protrusion 44 and the second protrusion 45; in the portion of the outer peripheral surface 43c located circumferentially between the second protrusion 45 and the third protrusion 46; in the portion of the outer peripheral surface 43c located circumferentially between the third protrusion 46 and the fourth protrusion 47; and in the portion of the outer peripheral surface 43c located circumferentially between the fourth protrusion 47 and the first protrusion 44. That is, in this embodiment, a total of four second welding portions 82 are provided.

[0069] Each second weld portion 82 is positioned between each protrusion 49 near the opposite side (-θ side) in the circumferential direction. For example, a second weld portion 82 located in the portion of the outer circumferential surface 43c between the first protrusion 44 and the second protrusion 45 in the circumferential direction is positioned closer to the third side surface 45a in the circumferential direction than the first side surface 44a. Figure 3 As shown, the second weld portion 82, which is provided in the outer peripheral surface 43c between the first protrusion 44 and the second protrusion 45 in the circumferential direction, is located on the other side of the circumferential direction than the vertex VP.

[0070] In this embodiment, the second weld portion 82 is located radially outside the portion of the core back 43a located between adjacent flux blocking portions 48 in the circumferential direction. The second weld portion 82 is located radially outside a pole tooth 43b. Figure 6 As shown, when viewed from the axial direction, the imaginary line IL2 connecting the second welded part 82 and the central axis J passes through the circumferential center of a pole tooth 43b and the circumferential center between adjacent magnetic flux blocking parts 48 in the circumferential direction.

[0071] The third weld portion 83 is a weld portion 80 provided on the radially outer side surface of the protrusion 49, at a circumferential position different from that of the orifice portion 49a. In this embodiment, a plurality of third weld portions 83 are provided. Each of the first protrusion 44, the second protrusion 45, the third protrusion 46, and the fourth protrusion 47 is provided with one third weld portion 83. That is, in this embodiment, a total of four third weld portions 83 are provided.

[0072] The third welding portion 83 is provided on the side of each protrusion 49 facing the other side (-θ side) in the circumferential direction. More specifically, the third welding portion 83 is provided on the circumferential end of the side of each protrusion 49 facing the other side in the circumferential direction, near the outer peripheral surface 43c of the core back 43a (-θ side). The side of the first protrusion 44 facing the other side in the circumferential direction is a first side surface 44a, which is an inclined surface. The side of the second protrusion 45 facing the other side in the circumferential direction is a fourth side surface 45b, which is an inclined surface.

[0073] In this embodiment, the third weld portion 83 is located radially outside the portion of the core back 43a between adjacent circumferential flux blocking portions 48. The third weld portion 83 is located radially outside a pole tooth 43b. When viewed axially, the imaginary line IL3 connecting the third weld portion 83 and the central axis J passes through the circumferential center of a pole tooth 43b and the circumferential center between adjacent circumferential flux blocking portions 48.

[0074] The first weld portion 81, the second weld portion 82, and the third weld portion 83 are alternately arranged on the radially outer surface of the stator core portion 41 facing towards the circumferential side (+θ side). In this embodiment, a second weld portion 82 and a third weld portion 83 are provided on the upper surface, the front (+X side) surface, the lower surface, and the rear (-X side) surface of the stator core portion 41. The first weld portion 81 is respectively provided at the boundary between the front and upper surfaces of the stator core portion 41, the boundary between the upper and rear surfaces of the stator core portion 41, the boundary between the rear and lower surfaces of the stator core portion 41, and the boundary between the lower and front surfaces of the stator core portion 41. In this embodiment, the first weld portion 81 is located radially outer than the second weld portion 82 and the third weld portion 83.

[0075] like Figure 2 As shown, the coil assembly 42 has a plurality of coils 42c mounted circumferentially on the stator core 41. The plurality of coils 42c are respectively mounted on each pole tooth 43b of the stator core 41 via an insulator (not shown). The plurality of coils 42c are arranged circumferentially. More specifically, the plurality of coils 42c are arranged at equal intervals throughout the circumference. Although not shown, the coil assembly 42 may have either a bundling member for bundling the coils 42c or jumpers for connecting the coils 42c to each other.

[0076] The coil assembly 42 has coil ends 42a and 42b that protrude axially from the stator core 41. Coil end 42a is a portion protruding axially from the stator core 41 to one side. Coil end 42b is a portion protruding axially from the stator core 41 to the other side. Coil end 42a includes the portion of each coil 42c included in the coil assembly 42 that protrudes axially beyond the stator core 41. Coil end 42b includes the portion of each coil 42c included in the coil assembly 42 that protrudes axially to the other side beyond the stator core 41. In this embodiment, the coil ends 42a and 42b are annular about the central axis J. Although not shown in the figures, the coil ends 42a and 42b may include a bundling member for bundling the coils 42c, or jumpers connecting the coils 42c to each other.

[0077] In this embodiment, the refrigerant supply section 50 is a tubular shape extending axially. In other words, in this embodiment, the refrigerant supply section 50 is a tube extending axially. Both axial ends of the refrigerant supply section 50 are supported by the motor housing 20. One axial end of the refrigerant supply section 50 is supported, for example, by the partition wall 22. The other axial end of the refrigerant supply section 50 is supported, for example, by the cover 23. The refrigerant supply section 50 is located radially outward of the stator 40. In this embodiment, the refrigerant supply section 50 is located on the upper side of the stator 40.

[0078] like Figure 3 As shown, the refrigerant supply section 50 is located circumferentially between the first protrusion 44 and the second protrusion 45. The refrigerant supply section 50 is located circumferentially between the opposing support portion 24a and the second protrusion 45. In this embodiment, the refrigerant supply section 50 is positioned circumferentially closer to the second protrusion 45 than the first protrusion 44. The refrigerant supply section 50 is, for example, located above the boundary between the second protrusion 45 and the stator core body 43. The refrigerant supply section 50 is located above the connecting portion P2a. The refrigerant supply section 50 is configured to overlap, when viewed vertically, the end of the third side surface 45a of the second protrusion 45 on one circumferential side (+θ side) and the outer peripheral surface 43c of the stator core body 43. Figure 5 As shown, the refrigerant supply section 50 has a wide section 51, an inlet section 52, and an outlet section 53.

[0079] like Figure 4As shown, in this embodiment, the entire refrigerant supply section 50, except for the inlet section 52 and the outlet section 53, is a wide section 51. In this embodiment, the wide section 51 is the main body of the refrigerant supply section 50. The arrangement of the wide section 51 relative to the stator core 41 is the same as the arrangement of the refrigerant supply section 50 relative to the stator core 41 described above. The wide section 51 is located radially outward of the stator 40. In this embodiment, the wide section 51 is located on the upper side of the stator 40. The wide section 51 is located circumferentially between the support section 24a and the second protrusion 45.

[0080] The axial dimension of the wide portion 51 is larger than that of the stator core portion 41. The wide portion 51 protrudes axially to both sides compared to the stator core portion 41. The wide portion 51 is disposed across the upper side of the stator core portion 41 and the upper sides of the coil ends 42a and 42b. The portion of the wide portion 51 that protrudes axially to one side compared to the stator core portion 41 is located above the coil end 42a. The portion of the wide portion 51 that protrudes axially to the other side compared to the stator core portion 41 is located above the coil end 42b.

[0081] The wide portion 51 is the part whose circumferential dimension is larger than its radial dimension. For example... Figure 3 As shown, the wide portion 51 is, for example, a cylindrical shape that has been flattened radially, i.e., a roughly elliptical cylindrical shape that is flattened radially. The radially inner surface of the wide portion 51 is a facing surface 51a that is radially opposite to the outer peripheral surface of the stator core portion 41. The facing surface 51a is radially opposite to the outer peripheral surface 43c of the stator core body 43. The facing surface 51a is shaped along the outer peripheral surface of the stator core portion 41, i.e., in this embodiment, it is shaped along the outer peripheral surface 43c of the stator core body 43. The facing surface 51a is a curved surface that is concave radially outward. When viewed axially, the facing surface 51a is an arc shape that bulges radially outward with the central axis J as the center. 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.

[0082] like Figure 4 As shown, the inlet portion 52 is connected to the axial end of the wide portion 51. The inlet portion 52 is cylindrical and open on one side of the axial direction. The inlet portion 52 is the axial end of the refrigerant supply portion 50. The inlet portion 52 is, for example, inserted into an orifice (not shown) provided in the partition wall portion 22, thereby being supported by the partition wall portion 22. Oil O flows into the interior of the refrigerant supply portion 50 from the inlet portion 52.

[0083] The outlet portion 53 is connected to the end of the wide portion 51 on the other side of the axial direction. The outlet portion 53 is cylindrical and opens on the other side of the axial direction. The outlet portion 53 is the end of the refrigerant supply portion 50 on the other side of the axial direction. The outlet portion 53 is, for example, embedded in an opening (not shown) provided in the cover portion 23, thereby being supported by the cover portion 23. A portion of the oil O that flows into the interior 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 side of the axial direction to the other side of the axial direction. That is, in the flow direction of the oil O in the refrigerant supply portion 50, the axial side is the upstream side and the other side of the axial direction is the downstream side.

[0084] The refrigerant supply section 50 has a supply port 50a, which supplies oil O, which is the refrigerant, to the stator 40. In this embodiment, the supply port 50a is a spray port that sprays a portion of the oil O flowing into the refrigerant supply section 50 to the outside of the refrigerant supply section 50. Multiple supply ports 50a are provided. In this embodiment, all supply ports 50a are provided in the wide section 51. That is, the wide section 51 has at least one supply port 50a.

[0085] The supply port 50a is formed by a hole through which the wall of the tubular refrigerant supply section 50 passes from the inner peripheral surface to the outer peripheral surface. The supply port 50a is an opening in the hole through which the wall of the tubular refrigerant supply section 50 passes from the inner peripheral surface to the outer peripheral surface, and it opens onto the outer peripheral surface of the refrigerant supply section 50. The supply port 50a is, for example, circular. In this embodiment, the supply port 50a provided on the wide portion 51 includes a first supply port 54, a second supply port 55, and a third supply port 56.

[0086] The first supply port 54 is a supply port 50a that supplies oil O, which is used as a refrigerant, to the stator core 41. The first supply port 54 is a supply port 50a that opens to one circumferential side (+θ side). Figure 3 As shown, in this embodiment, the first supply port 54 is located on the circumferential side (-θ side) of the apex VP of the stator core body 43. The first supply port 54 is located on the upper side of the stator core body 43. The opposite support portion 24a and the first protrusion 44 are located on the circumferential side of the first supply port 54.

[0087] The first supply port 54 is located at the end of the wide portion 51 on one circumferential side (+θ side), near the radially inward side. In this embodiment, the first supply port 54 opens in a direction inclined radially inward relative to the circumferential direction. Figure 4 As shown, in this embodiment, a plurality of first supply ports 54 are provided. The first supply ports 54 include, for example, three first supply ports 54a, 54b, and 54c.

[0088] First supply ports 54a, 54b, and 54c are arranged sequentially at intervals from one axial side to the other. First supply ports 54a and 54b are located axially closer to the center of the stator core 41. First supply port 54c is located axially closer to the center of the stator core 41. The axial distance between first supply ports 54a and 54b is smaller than the axial distance between first supply ports 54b and 54c.

[0089] The first supply port 54a is located on the axial side of the opposite support portion 24a. That is, in this embodiment, the first supply port 54a is a first supply port 54 disposed at a different position from the opposite 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.

[0090] The axial positions of the first supply ports 54b and 54c are the same as the axial positions of the two through slots 24b provided in the opposite support portion 24a. For example... Figure 3 As shown, the first supply ports 54b and 54c are first supply ports 54 that open toward the through groove 24b. Furthermore, in this specification, "first supply port opening toward the through groove" simply means that at least a portion of the first supply port overlaps with the interior of the through groove when viewed from the direction of its opening. In this embodiment, the first supply ports 54b and 54c overlap with the interior of the through groove 24b and the outer peripheral surface 43c of the stator core body 43 when viewed from the direction of their openings. The direction of the opening of the first supply port 54 is, for example, the direction in which the hole constituting the first supply port 54 passes through the wall of the refrigerant supply section 50 from the inner peripheral surface to the outer peripheral surface.

[0091] Oil O discharged from the first supply ports 54b and 54c is sprayed toward the openings of the first supply ports 54b and 54c, thereby supplying oil to the outer peripheral surface 43c of the stator core body 43. Oil O supplied from the first supply ports 54b and 54c to the outer peripheral surface 43c flows along the outer peripheral surface 43c toward one circumferential side (+θ side) and passes circumferentially through the through groove 24b. Oil O passing through the through groove 24b flows from the outer peripheral surface 43c to the first side surface 44a of the first protrusion 44 and crosses the first protrusion 44 circumferentially. Oil O crossing the first protrusion 44 flows downward between the second side surface 44b and the inner peripheral surface of the motor housing 20, and is supplied to the front portion of the outer peripheral surface 43c of the stator core body 43.

[0092] The second supply port 55 is a supply port 50a for supplying oil O, which is used as a refrigerant, to the stator core 41. The second supply port 55 is a supply port 50a that opens to the other side (-θ side) in the circumferential direction. In this embodiment, the second supply port 55 is located on the other side of the circumferential direction above 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 protrusion 45 is located on the other side of the circumferential direction of the second supply port 55. The second supply port 55 is located on the upper side of the end of the second protrusion 45 on the circumferential side (+θ side).

[0093] The second supply port 55 is located at the end of the wide portion 51 on the other side (-θ side) in the circumferential direction, near the radially outer portion. In this embodiment, the second supply port 55 opens in a direction inclined radially outward relative to the circumferential direction. When viewed from the direction in which the second supply port 55 opens, the second supply port 55 overlaps with the portion of the inner circumferential surface of the motor housing 20 that is disposed opposite to the upper side of the second protrusion 45. The direction in which the second supply port 55 opens is, for example, the direction in which the hole constituting the second supply port 55 passes through the wall of the refrigerant supply portion 50 from the inner circumferential surface to the outer circumferential surface. Figure 4 As shown, in this embodiment, a plurality of second supply ports 55 are provided. The second supply ports 55 include, for example, three second supply ports 55a, 55b, and 55c.

[0094] The second supply ports 55a, 55b, and 55c are arranged alternately from one axial side to the other. The second supply port 55a is located axially closer to the center of the stator core 41. The second supply port 55b is located axially at approximately the same position as the center of the stator core 41. The second supply port 55c is located axially closer to the center of the stator core 41. The axial spacing between the second supply ports 55a and 55b is, for example, the same as the axial spacing between the second supply ports 55b and 55c. 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.

[0095] Oil O discharged from the second supply port 55 is sprayed toward the opening of the second supply port 55 and supplied to the portion of the inner circumferential surface of the motor housing 20 located above the second protrusion 45. Oil O supplied from the second supply port 55 to the inner circumferential surface of the motor housing 20 flows to the other circumferential side (-θ side) on the inner circumferential surface of the motor housing 20 and crosses the second protrusion 45 to the other circumferential side. Oil O crossing the second protrusion 45 flows downward between the fourth side surface 45b and the inner circumferential surface of the motor housing 20 and is supplied to the rear portion of the outer circumferential surface 43c of the stator core body 43.

[0096] In this embodiment, the first supply port 54 and the second supply port 55 are offset from each other axially along the central axis J. For example, the first supply port 54a is offset slightly to the opposite side of the axial direction relative to the second supply port 55a. For example, the first supply port 54b is offset significantly to one side of the axial direction relative to the second supply port 55b. The first supply port 54c is offset slightly to one side of the axial direction relative to the second supply port 55c.

[0097] Furthermore, in this specification, the phrase "the first supply port and the second supply port are axially offset" simply means that the centers of the first supply port and the second supply port are axially offset; alternatively, a portion of the first supply port and a portion of the second supply port may be positioned at the same axial location. In this embodiment, a portion of the first supply port 54a and a portion of the second supply port 55a are positioned at the same axial location. A portion of the first supply port 54c and a portion of the second supply port 55c are positioned at the same axial location. The first supply port 54b and the second supply port 55b are entirely axially offset.

[0098] The third supply port 56 is a supply port 50a for supplying oil O, which is used 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, which is disposed above the coil end 42a; and a third supply port 56b, which is disposed above the coil end 42b. The third supply port 56a is located on the axial side relative to the first supply port 54 and the second supply port 55. The third supply port 56b is located on the axial side relative to the first supply port 54 and the second supply port 55. For example, multiple third supply ports 56a and 56b are provided. For example, five third supply ports 56a and five third supply ports 56b are provided. The five third supply ports 56a are arranged at intervals along the width portion 51. The five third supply ports 56b are arranged at intervals along the width portion 51.

[0099] like Figure 2 As shown, in this embodiment, a refrigerant flow path 90 is provided in the drive device 100 for circulating oil O, which is used as a refrigerant. The refrigerant flow path 90 is configured to span the interior of the motor housing 20 and the interior of the gear housing 61. The refrigerant flow path 90 is a path that supplies oil O stored in the gear housing 61 to the rotary motor 10 and returns it to the gear housing 61. A pump 71, a cooler 72, and a refrigerant supply unit 50 are provided in the refrigerant flow path 90. The refrigerant flow path 90 has a first flow path 91, a second flow path 92, a third flow path 93, and a fourth flow path 94.

[0100] The first flow path 91, the second flow path 92, and the third flow path 93 are provided, for example, in the wall of the gear housing 61. The fourth flow path 94 is provided, for example, in the cover 23. The first flow path 91 connects the portion of the gear housing 61 containing oil O to the pump 71. The second flow path 92 connects the pump 71 to the cooler 72. The third flow path 93 connects the cooler 72 to the interior of the refrigerant supply section 50. In this embodiment, the third flow path 93 is connected to the axial end of the refrigerant supply section 50. The fourth flow path 94 connects the interior of the refrigerant supply section 50 to the interior of the shaft 31. In this embodiment, the fourth flow path 94 is connected to both the axial end of the refrigerant supply section 50 and the axial end of the shaft 31.

[0101] When the pump 71 is driven, the oil O stored in the gear housing 61 is drawn up through the first flow path 91 and flows into the cooler 72 through the second flow path 92. After being cooled in the cooler 72, the oil O flows through the third flow path 93 into the interior of the refrigerant supply section 50. A portion of the oil O flowing into the refrigerant supply section 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 portion of the oil O flowing into the refrigerant supply section 50 flows into the interior of the shaft 31 through the fourth flow path 94. A portion of the oil O flowing into the shaft 31 is dispersed from the hole 33 through the interior of the rotor body 32 into the stator 40. Another portion of the oil O flowing into the shaft 31 is discharged from the opening on the axial side of the shaft 31 into the interior of the gear housing 61 and is stored again in the gear housing 61.

[0102] Oil O supplied to the stator 40 from the supply port 50a and oil O supplied to the stator 40 from inside the shaft 31 absorb heat from the stator 40. The cooled oil O falls downwards and accumulates in the lower region inside the motor housing 20. The oil O accumulated in the lower region inside the motor housing 20 returns to the gear housing 61 through the partition wall opening 22a provided in the partition wall portion 22. From there, the refrigerant flow path 90 supplies the oil O stored in the gear housing 61 to the rotor 30 and the stator 40.

[0103] According to this embodiment, the weld portion 80 provided on the radially outer side of the stator core 41 includes a first weld portion 81, which is provided on an imaginary line IL1 in the radially outer side of the stator core 41 that connects the orifice 49a to the central axis J when viewed from the axial direction. Therefore, the strength of the portion of the stator core 41 near the orifice 49a can be improved by the first weld portion 81. Thus, when tightening the bolt 25 passing through the orifice 49a, deformation of the portion of the stator core 41 near the orifice 49a can be suppressed. Especially in the case where the stator core 41 is constructed by stacking multiple plate members 41a axially, as in this embodiment, the multiple plate members 41a can be firmly fixed to each other at the portion near the orifice 49a in the stator core 41 by the first weld portion 81. Therefore, deformation of the thinner plate member 41a can be suppressed. As described above, according to this embodiment, deformation of the stator core 41 can be suppressed.

[0104] Furthermore, the first weld portion 81 is located radially outward from the central axis J, compared to the orifice 49a located radially outward from the stator core portion 41. Therefore, the first weld portion 81 can be positioned further away from the rotor 30. This prevents magnetic flux flowing between the stator core portion 41 and the rotor 30 from easily passing through the first weld portion 81. Thus, the influence of the first weld portion 81 on the magnetic flux flowing between the stator core portion 41 and the rotor 30 can be suppressed. Therefore, even with the first weld portion 81 provided, the decrease in the magnetic characteristics of the rotary electric machine 10 can be suppressed. Thus, the output decrease of the rotary electric machine 10 can be suppressed, and the first weld portion 81 can be provided to suppress deformation of the stator core portion 41.

[0105] Furthermore, according to this embodiment, the orifice 49a is provided on the protrusion 49. The first weld portion 81 is provided on the radially outer side of the protrusion 49. Therefore, compared to the case where the orifice 49a and the first weld portion 81 are provided on the core back 43a, the influence of the orifice 49a and the first weld portion 81 on the magnetic flux flowing between the stator core 41 and the rotor 30 can be further suppressed. As a result, the decrease in the magnetic characteristics of the rotary motor 10 can be further suppressed. As a result, the decrease in the output of the rotary motor 10 can be further suppressed.

[0106] Furthermore, according to this embodiment, when viewed axially, the distance L2 between the flux blocking portion 48 disposed on the core back 43a and the orifice portion 49a is larger than the distance L1 between the first weld portion 81 and the orifice portion 49a. Therefore, both the orifice portion 49a and the first weld portion 81 can be configured to be appropriately moved radially outward from the core back 43a. As a result, the influence of the orifice portion 49a and the first weld portion 81 on the flux flowing between the stator core portion 41 and the rotor 30 can be further suppressed. As a result, the decrease in the magnetic characteristics of the rotary motor 10 can be further suppressed. As a result, the decrease in the output of the rotary motor 10 can be further suppressed.

[0107] Furthermore, according to this embodiment, the welding portion 80 includes a second welding portion 82 disposed on the outer peripheral surface 43c of the core back 43a. Therefore, the strength of the stator core 41 can be further improved by the second welding portion 82. In addition, the plate members 41a can be more firmly fixed to each other by the second welding portion 82. Therefore, deformation of the stator core 41 can be further suppressed.

[0108] Furthermore, according to this embodiment, the second weld portion 82 is located radially outside the portion of the core back 43a between adjacent flux blocking portions 48 in the circumferential direction. Therefore, compared to the case where the second weld portion 82 is located radially outside the flux blocking portion 48, it is easier to increase the distance between the radially outer surface of the stator core 41 and the radial direction of the flux blocking portion 48, as well as the distance between the flux blocking portion 48 and the second weld portion 82. This easily ensures the magnetic path for flux to flow between the radially outer surface of the stator core 41 and the radial direction of the flux blocking portion 48, and between the flux blocking portion 48 and the second weld portion 82. Therefore, it is easy to suppress the influence of the second weld portion 82 on the flux flowing in the core back 43a. Therefore, even with the second weld portion 82 provided, the decrease in the magnetic characteristics of the rotary motor 10 can be suppressed. Therefore, the output decrease of the rotary motor 10 can be suppressed, and the second weld portion 82 can be provided to further suppress the deformation of the stator core 41.

[0109] Furthermore, according to this embodiment, the second weld portion 82 is located radially outside the pole tooth 43b. Here, the magnetic flux flowing from the pole tooth 43b to the core back 43a flows radially outward within the pole tooth 43b and is split into two circumferential sides in the core back 43a. In this case, the magnetic flux is less likely to flow to the portion of the stator core 41 located radially outside the pole tooth 43b on its radially outer side surface. Therefore, by providing the second weld portion 82 radially outside the pole tooth 43b, the influence of the second weld portion 82 on the magnetic flux flowing in the core back 43a can be further suppressed. As a result, the decrease in the magnetic characteristics of the rotary motor 10 can be further suppressed.

[0110] Furthermore, according to this embodiment, the welding portion 80 includes a third welding portion 83, which is provided in the radially outer side surface of the protrusion 49 at a circumferential position different from that of the orifice portion 49a. Therefore, the strength of the stator core portion 41 can be further improved by the third welding portion 83. Furthermore, the plate members 41a can be more firmly fixed to each other by the third welding portion 83. Therefore, deformation of the stator core portion 41 can be further suppressed.

[0111] Furthermore, according to this embodiment, the third welding portion 83 is provided at the circumferential end of the first side surface 44a, which is an inclined surface, on the side (-θ side) near the outer peripheral surface 43c of the core back 43a. Here, the first side surface 44a, which is an inclined surface, extends along a tangent TL1a, which is tangent to the connecting portion P1a that connects to the radially inner end of the first side surface 44a in the outer peripheral surface 43c of the core back 43a. Therefore, the circumferential end of the first side surface 44a near the outer peripheral surface 43c of the core back 43a is more easily positioned circumferentially away from the orifice 49a compared to the case where the first side surface 44a has the shape of a second side surface 44b. Therefore, by providing the third welding portion 83 at the circumferential end of the first side surface 44a near the outer peripheral surface 43c, the third welding portion 83 can be positioned circumferentially away from the first welding portion 81 to some extent. Therefore, the first weld portion 81 and the third weld portion 83 can easily reinforce the radial outer surface of the stator core 41 over a relatively large area. This further suppresses deformation of the stator core 41. Furthermore, when the second weld portion 82 is provided, the third weld portion 83 can easily be positioned at the circumferential middle portion between the first weld portion 81 and the second weld portion 82. Therefore, the first weld portion 81, the second weld portion 82, and the third weld portion 83 can easily and appropriately reinforce the radial outer surface of the stator core 41 over a larger area. This further suppresses deformation of the stator core 41. The above applies to the third weld portion 83 located on the fourth side 45b of the second protrusion 45, the third weld portion 83 located on the side circumferentially opposite to the third protrusion 46, and the third weld portion 83 located on the side circumferentially opposite to the fourth protrusion 47.

[0112] Furthermore, according to this embodiment, the third weld portion 83 is located radially outside the portion of the core back 43a located between adjacent flux blocking portions 48 in the circumferential direction. Therefore, compared to the case where the third weld portion 83 is located radially outside the flux blocking portion 48, it is easier to increase the distance between the radially outer surface of the stator core 41 and the radial direction of the flux blocking portion 48, as well as the distance between the flux blocking portion 48 and the third weld portion 83. As a result, it is easier to ensure the magnetic path for the flux to flow between the radially outer surface of the stator core 41 and the radial direction of the flux blocking portion 48, and between the flux blocking portion 48 and the third weld portion 83. Therefore, it is easier to suppress the influence of the third weld portion 83 on the flux flowing in the core back 43a. Therefore, even with the third weld portion 83 provided, the decrease in the magnetic characteristics of the rotary motor 10 can be suppressed. Therefore, the output decrease of the rotary motor 10 can be suppressed, and the third weld portion 83 can be provided to further suppress the deformation of the stator core 41.

[0113] Furthermore, according to this embodiment, the third weld portion 83 is located radially outside the pole tooth 43b. Therefore, similar to the second weld portion 82 described above, the influence of the third weld portion 83 on the magnetic flux flowing in the core back 43a can be further suppressed. As a result, the decrease in the magnetic characteristics of the rotary motor 10 can be further suppressed.

[0114] Furthermore, according to this embodiment, the plurality of welded portions 80 are arranged to be rotationally symmetrical about the central axis J on the radially outer surface of the stator core 41. Therefore, the radially outer surface of the stator core 41 can be reinforced with high balance throughout the entire circumference by means of the plurality of welded portions 80. As a result, deformation of the stator core 41 can be further suppressed. In addition, even with the provision of a plurality of welded portions 80, circumferential imbalance of the mass of the stator core 41 can be suppressed.

[0115] Furthermore, according to this embodiment, the plurality of welded portions 80 are arranged at equal angles along the circumference. Therefore, the radial outer surface of the stator core 41 can be reinforced more appropriately and with high balance throughout the entire circumference by means of the plurality of welded portions 80. As a result, deformation of the stator core 41 can be suppressed more appropriately. In addition, even with the provision of a plurality of welded portions 80, circumferential imbalance of the mass of the stator core 41 can be suppressed more appropriately.

[0116] Furthermore, according to this embodiment, the weld portion 80 extends circumferentially. Therefore, the portion of the stator core 41 reinforced by the weld portion 80 can be increased axially. As a result, the strength of the stator core 41 can be further improved by the weld portion 80. In addition, the weld portion 80 can be used to properly fix the plurality of plate members 41a stacked axially to each other.

[0117] This invention is not limited to the embodiments described above. Other structures and methods can be employed within the scope of the technical concept of this invention. As long as a first welding portion is included, the welding portion may not include at least one of the second and third welding portions, or it may include a fourth welding portion different from the second and third welding portions. As long as it is provided on the outer peripheral surface of the core back, the second welding portion can be provided at any position. As long as it is provided on the radially outer side surface of the protrusion, and its circumferential position differs from that of the orifice, the third welding portion can also be provided at any position. The shape of the welding portion is not particularly limited.

[0118] Multiple welded portions may be arranged rotationally symmetrically on the radial outer surface of the stator core, other than symmetrically about four times around the central axis. When N is an integer greater than or equal to 2, multiple welded portions may also be arranged symmetrically about N times around the central axis on the radial outer surface of the stator core. Multiple welded portions may also be arranged radially outer surface of the stator core without rotational symmetry about the central axis. Multiple welded portions may also not be arranged at equal angles along the circumferential direction. The number of welded portions is not particularly limited as long as there is one or more. Furthermore, the welded portion 80 does not need to extend from one end of the stator core 41 along the axial direction to the other end. For example, multiple welded portions may be arranged axially. The welded portion 80 may also be provided only at one end of the stator core 41 along the axial direction and the other end.

[0119] The orifice can also be located on the back of the core. In this case, the first weld portion can also be located on the outer peripheral surface of the back of the core. Furthermore, in this case, the stator core may not have a protrusion. The orifice can be any orifice as long as it extends axially. The orifice can also be an orifice with a bottom at one end along the axial direction. In this case, the orifice can also be a threaded hole for a bolt for fixing the stator core to be screwed into. The number of orifices is not particularly limited as long as there is one or more. The protrusion of the stator core can also be of any shape. The number and shape of the flux blocking portions are not particularly limited. Flux blocking portions may also be omitted.

[0120] The rotary motor using this invention is not limited to a motor, but can also be a generator. The application of the rotary motor is not particularly limited. For example, the rotary motor can be installed on a moving body for purposes other than rotating an axle, or it can be installed on equipment other than a moving body. The posture when using the rotary motor is not particularly limited. The central axis of the rotary motor can also extend in a vertical direction. The moving body equipped with the rotary motor is not limited to a vehicle, but can be an aircraft or a ship. The moving body can be manned or unmanned. The structures and methods described above can be appropriately combined without contradiction.

Claims

1. A stator comprising a stator core having an annular core back surrounding a central axis and a plurality of pole teeth extending radially inward from the core back. The stator core has: An orifice portion, wherein the orifice portion is disposed on the radially outer portion of the stator core and extends axially; and The welding portion is disposed on the radial outer surface of the stator core. The welding portion includes a first welding portion, which is disposed on an imaginary line connecting the orifice portion to the central axis when viewed from the axial direction in the radially outer surface of the stator core. The core back has a cylindrical outer peripheral surface. The stator core has a protrusion that extends radially outward from the outer peripheral surface of the core back. The orifice is located on the protrusion. The first weld portion is disposed on the radially outer side of the protrusion. The core back has a magnetic flux blocking section. When viewed from the axial direction, the distance between the magnetic flux blocking part and the orifice is greater than the distance between the first welded part and the orifice.

2. The stator as claimed in claim 1, wherein, The welding part includes a second welding part, which is disposed on the outer peripheral surface of the core back.

3. The stator as described in claim 2, wherein, The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The second weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

4. The stator as described in claim 2, wherein, The second welded portion is located radially outside the pole tooth.

5. The stator as described in claim 3, wherein, The second welded portion is located radially outside the pole tooth.

6. The stator as claimed in any one of claims 1 to 5, wherein, The welding portion includes a third welding portion, which is disposed on the radial outer side of the protrusion at a circumferential position different from that of the orifice.

7. The stator as claimed in claim 6, wherein, The protrusion has an inclined surface that extends radially outward and circumferentially to one side from the outer peripheral surface of the core back. When viewed from the axial direction, the inclined surface extends along a tangent, which is tangent to the connection portion of the outer peripheral surface of the core back, where the radially inner end of the inclined surface is connected. The third welding part is located at the circumferential end of the inclined surface, near the outer peripheral surface of the core back.

8. The stator as claimed in claim 6, wherein, The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The third weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

9. The stator as claimed in claim 7, wherein, The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The third weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

10. The stator as claimed in claim 6, wherein, The third weld portion is located radially outside the pole tooth.

11. The stator as claimed in any one of claims 1 to 5, wherein, The welding section is provided in multiple ways. The plurality of the welded portions are arranged symmetrically about the central axis on the radial outer surface of the stator core.

12. The stator as claimed in claim 11, wherein, The plurality of the welded portions are arranged at equal angles along the circumference.

13. The stator as claimed in any one of claims 1 to 5, wherein, The welded portion extends axially.

14. A stator comprising a stator core having an annular core back surrounding a central axis and a plurality of pole teeth extending radially inward from the core back. The stator core has: An orifice portion, wherein the orifice portion is disposed on the radially outer portion of the stator core and extends axially; and The welding portion is disposed on the radial outer surface of the stator core. The welding portion includes a first welding portion, which is disposed on an imaginary line connecting the orifice portion to the central axis when viewed from the axial direction in the radially outer surface of the stator core. The core back has a cylindrical outer peripheral surface. The stator core has a protrusion that extends radially outward from the outer peripheral surface of the core back. The orifice is located on the protrusion. The first weld portion is disposed on the radially outer side of the protrusion. The welding portion includes a second welding portion, which is disposed on the outer peripheral surface of the core back. The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The second weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

15. The stator as claimed in claim 14, wherein, The second welded portion is located radially outside the pole tooth.

16. The stator as claimed in claim 14, wherein, The welding portion includes a third welding portion, which is disposed on the radial outer side of the protrusion at a circumferential position different from that of the orifice.

17. The stator as claimed in claim 16, wherein, The protrusion has an inclined surface that extends radially outward and circumferentially to one side from the outer peripheral surface of the core back. When viewed from the axial direction, the inclined surface extends along a tangent, which is tangent to the connection portion of the outer peripheral surface of the core back, where the radially inner end of the inclined surface is connected. The third welding part is located at the circumferential end of the inclined surface, near the outer peripheral surface of the core back.

18. The stator as claimed in claim 17, wherein, The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The third weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

19. The stator as claimed in any one of claims 16 to 18, wherein, The third weld portion is located radially outside the pole tooth.

20. The stator according to any one of claims 14 to 18, wherein, The welding section is provided in multiple ways. The plurality of the welded portions are arranged symmetrically about the central axis on the radial outer surface of the stator core.

21. The stator as claimed in claim 20, wherein, The plurality of the welded portions are arranged at equal angles along the circumference.

22. The stator according to any one of claims 14 to 18, wherein, The welded portion extends axially.

23. A stator comprising a stator core having an annular core back surrounding a central axis and a plurality of pole teeth extending radially inward from the core back. The stator core has: An orifice portion, wherein the orifice portion is disposed on the radially outer portion of the stator core and extends axially; and The welding portion is disposed on the radial outer surface of the stator core. The welding portion includes a first welding portion, which is disposed on an imaginary line connecting the orifice portion to the central axis when viewed from the axial direction in the radially outer surface of the stator core. The core back has a cylindrical outer peripheral surface. The stator core has a protrusion that extends radially outward from the outer peripheral surface of the core back. The orifice is located on the protrusion. The first weld portion is disposed on the radially outer side of the protrusion. The welding portion includes a third welding portion, which is disposed on the radially outer side surface of the protrusion at a circumferential position different from that of the orifice. The protrusion has an inclined surface that extends radially outward and circumferentially to one side from the outer peripheral surface of the core back. When viewed from the axial direction, the inclined surface extends along a tangent, which is tangent to the connection portion of the outer peripheral surface of the core back, where the radially inner end of the inclined surface is connected. The third welding part is located at the circumferential end of the inclined surface, near the outer peripheral surface of the core back.

24. The stator as claimed in claim 23, wherein, The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The third weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

25. The stator as claimed in claim 23, wherein, The third weld portion is located radially outside the pole tooth.

26. The stator according to any one of claims 23 to 25, wherein, The welding section is provided in multiple ways. The plurality of the welded portions are arranged symmetrically about the central axis on the radial outer surface of the stator core.

27. The stator as claimed in claim 26, wherein, The plurality of the welded portions are arranged at equal angles along the circumference.

28. The stator as claimed in any one of claims 23 to 25, wherein, The welded portion extends axially.

29. A stator comprising a stator core having an annular core back surrounding a central axis and a plurality of pole teeth extending radially inward from the core back. The stator core has: An orifice portion, wherein the orifice portion is disposed on the radially outer portion of the stator core and extends axially; and The welding portion is disposed on the radial outer surface of the stator core. The welding portion includes a first welding portion, which is disposed on an imaginary line connecting the orifice portion to the central axis when viewed from the axial direction in the radially outer surface of the stator core. The core back has a cylindrical outer peripheral surface. The stator core has a protrusion that extends radially outward from the outer peripheral surface of the core back. The orifice is located on the protrusion. The first weld portion is disposed on the radially outer side of the protrusion. The welding portion includes a third welding portion, which is disposed on the radially outer side surface of the protrusion at a circumferential position different from that of the orifice. The core back has a plurality of magnetic flux blocking portions arranged at intervals in the circumferential direction. The third weld portion is located radially outside the portion of the core back that is located between the circumferentially adjacent flux blocking portions.

30. The stator as claimed in claim 29, wherein, The third weld portion is located radially outside the pole tooth.

31. The stator as claimed in claim 29, wherein, The welding section is provided in multiple ways. The plurality of the welded portions are arranged symmetrically about the central axis on the radial outer surface of the stator core.

32. The stator as claimed in claim 31, wherein, The plurality of the welded portions are arranged at equal angles along the circumference.

33. The stator according to any one of claims 29 to 32, wherein, The welded portion extends axially.

34. A rotary electric motor, comprising: The stator according to any one of claims 1 to 33; as well as The rotor is opposite the stator with a gap between them.

35. A drive unit, the drive unit being mounted in a vehicle, wherein, The driving device includes: The rotary motor as claimed in claim 34; and A transmission device is connected to the rotary motor and transmits the rotation of the rotary motor to the axle of the vehicle.

36. A mobile body, wherein, The moving body includes the rotary motor as described in claim 34.

Images