Motor unit

Abstract

This invention provides a novel and useful technology for supplying a refrigerant to the coil ends to cool them. [Solution] The motor unit comprises a housing, a stator core, a stator coil provided on the stator core and having coil ends protruding from the end face of the stator core, a busbar module facing the coil ends from the radially outer side perpendicular to the axial direction and connected to the coil ends of the stator coil, and a spacer provided in the axial direction between the end face of the stator core and the busbar module. The housing has a housing opening on the surface facing the spacer in the radial direction and includes a first supply channel for supplying refrigerant toward the spacer. The spacer includes a second supply channel extending between a first spacer opening on the inner circumferential surface of the spacer and a second spacer opening on the outer circumferential surface of the spacer, and supplying refrigerant toward the coil ends.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor unit.

Background Art

[0002] Patent Document 1 discloses a motor unit including a housing, an annular stator core housed in the housing and extending along the axial direction, the stator core having an end face located on one side in the axial direction, a stator coil provided on the stator core and having a coil end protruding from the end face of the stator core, and a bus bar module facing the coil end from the outer side in the radial direction orthogonal to the axial direction and connected to the coil end of the stator coil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the motor unit of Patent Document 1, an opening for supplying oil toward the coil end is provided in the bus bar module, and the oil passing through the opening is supplied to the coil end.

[0005] This specification provides a novel and useful technology for supplying a refrigerant to the coil end to cool the coil end.

Means for Solving the Problems

[0006] In a first aspect of this technology, the motor unit may include a housing, an annular stator core housed in the housing and extending axially, the stator core having an end face located on one side in the axial direction, a stator coil provided on the stator core and having a coil end protruding from the end face of the stator core, a busbar module facing the coil end from the radially outer side perpendicular to the axial direction and connected to the coil end of the stator coil, and a spacer provided in the axial direction between the end face of the stator core and the busbar module. The housing may include a first supply channel having a housing opening on the surface facing the spacer in the radial direction, the first supply channel supplying refrigerant toward the spacer. The spacer may include a second supply channel extending between a first spacer opening on the inner circumferential surface of the spacer and a second spacer opening on the outer circumferential surface of the spacer, the second supply channel supplying refrigerant toward the coil end.

[0007] According to the above configuration, the refrigerant is supplied to the coil end through the first supply channel in the housing and the second supply channel in the spacer. Therefore, the coil end can be cooled.

[0008] In a second embodiment, the motor unit may further include a first fastening member that fastens the spacer and the stator core together to the housing, in the first embodiment described above.

[0009] According to the above configuration, it is possible to suppress the peeling of the multiple electrical steel sheets that make up the stator core.

[0010] In a third embodiment, in the second embodiment, the stator core may have a cylindrical core body portion extending in the axial direction and a first core fixing portion that protrudes radially outward from the outer circumferential surface of the core body portion and has a first core fixing hole through which the first fastening member passes. The spacer may have a spacer body portion having a second supply channel and a first spacer fixing portion having a first spacer fixing hole through which the first fastening member passes.

[0011] The above configuration can reduce the impact on the magnetism of the stator core.

[0012] In a fourth embodiment, in the third embodiment, the spacer body may extend along a circumferential direction perpendicular to the axial and radial directions. The first spacer fixing portion may be located at one end of the spacer body in the circumferential direction.

[0013] According to the above configuration, the spacer can be securely fixed to the housing.

[0014] In the fifth embodiment, in the fourth embodiment, the first spacer fixing portion may protrude radially outward from one end of the spacer body in the circumferential direction.

[0015] According to the above configuration, the spacer body can be made smaller, and the spacer can be securely fixed to the housing.

[0016] In a sixth embodiment, the motor unit may further include a second fastening member for fastening the spacer and the stator core together to the housing, as in the fourth or fifth embodiment. The stator core may further have a second core fixing portion that protrudes radially outward from the outer circumferential surface of the core body and has a second core fixing hole through which the second fastening member passes. The spacer may further have a second spacer fixing portion that has a second spacer fixing hole through which the second fastening member passes. The second spacer fixing portion may be located at the other end of the spacer body in the circumferential direction.

[0017] According to the above configuration, the spacer can be firmly fixed to the housing.

[0018] In the seventh aspect, in the sixth aspect, the second spacer fixing portion may protrude radially outward at the other end of the spacer main body portion in the circumferential direction.

[0019] According to the above configuration, the spacer main body portion can be miniaturized, and the spacer can be firmly fixed to the housing.

[0020] In the eighth aspect, in any one of the fourth to seventh aspects, the second spacer opening may be provided over a predetermined range in the circumferential direction of the spacer main body portion.

[0021] According to the above configuration, the coil end can be cooled over a predetermined range. Therefore, the coil end can be firmly cooled.

[0022] In the ninth aspect, in any one of the first to eighth aspects, the second spacer opening may be directed in a direction forming an angle with respect to the radial direction.

[0023] According to the above configuration, oil can be supplied to various parts of the coil end. Therefore, the coil end can be firmly cooled.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic diagram (cross-sectional view) of the motor unit 2. [Figure 2] It is a view of the motor unit 2 in a state where the second housing 22, the bus bar module 14, and the spacer 16 are not attached, viewed from one axial side. [Figure 3] It is a schematic diagram (cross-sectional view) around the protruding portion 52 of the stator core 46. [Figure 4] FIG. 1 is a view of the motor unit 2 with the second housing 22 not attached, as seen from one axial side. [Figure 5] FIG. 4 is a schematic view (cross-sectional view) around the bus bar module 14.

BEST MODE FOR CARRYING OUT THE INVENTION

[0025] (Embodiment) Referring to FIGS. 1 to 5, the motor unit 2 will be described. In this specification, a cylindrical coordinate system consisting of an axial direction D1, a radial direction D2, and a circumferential direction D3 (see FIG. 2) is defined based on the rotation axis A of the motor 12. The axial direction D1 is a direction parallel to the rotation axis A of the motor 12, and its coordinate axis is defined on the rotation axis. The radial direction D2 is a direction perpendicular to the axial direction D1 and is defined by a coordinate axis with the rotation axis A as the origin. And the circumferential direction D3 in FIG. 2 is a direction perpendicular to the axial direction D1 and the radial direction D2 and is defined by a coordinate axis that orbits around the rotation axis A. Also, the up-down direction when the motor unit 2 is mounted on an electric vehicle substantially coincides with the up-down direction in FIG. 1. The left-right direction when the motor unit 2 is mounted on an electric vehicle may be different from the left-right direction in FIG. 1. However, hereinafter, for ease of understanding, the description of the drawings may be made based on the left-right direction in FIG. 1.

[0026] As shown in FIG. 1, the motor unit 2 includes a housing 10, a motor 12, a bus bar module 14, a spacer 16, and an inverter 18. The inverter 18 is disposed outside the housing 10.

[0027] Housing 10 comprises a first housing 20 and a second housing 22. One side of the first housing 20 in the axial direction D1 is open. This side in the axial direction D1 is the left side in Figure 1. Hereinafter, this side in the axial direction D1 will be referred to as "the axial side." The upper part of the first housing 20 is provided with a first axial flow path 24 and a plurality of radial flow paths 26A to 26D. The first axial flow path 24 extends along the axial direction D1 between an opening 20A located on the other side of the axial direction D1 of the first housing 20 and an opening 20B located on the other side of the axial direction of the first housing 20. This other side in the axial direction D1 is the right side in Figure 1. Hereinafter, this other side in the axial direction D1 will be referred to as "the other side in the axial direction." That is, the first axial flow path 24 penetrates the first housing 20 in the axial direction D1. A flow path to which an oil pump is installed is connected to the opening 20A in the axial direction D1 of the first axial flow path 24. Multiple radial channels 26A to 26D are arranged along the axial direction D1. Multiple radial channels 26A to 26D branch off from the first axial channel 24. Each of the radial channels 26A to 26D extends from the first axial channel 24 to openings 27A to 27D located on the inner surface of the first housing 20 in the radial direction D2. That is, multiple radial channels 26A to 26D extend along the vertical direction.

[0028] The second housing 22 is connected to one axial end of the first housing 20. A second axial flow path 28 is provided in the upper part of the second housing 22. The second axial flow path 28 extends along the axial direction D1 between an opening 22A located on the other axial side of the second housing 22 and an opening 22B located on the one axial side of the second housing 22. The second axial flow path 28 penetrates the second housing 22 in the axial direction D1. The first axial flow path 24 and the second axial flow path 28 are in communication. The oil that has passed through the second axial flow path 28 is supplied to a gear unit or the like, which is located adjacent to the motor unit 2.

[0029] The motor 12 is housed in the housing 10. The motor 12 comprises a shaft 40, a rotor 42, and a stator 44. The shaft 40 extends along the axis of rotation A, which is the center of rotation of the shaft 40. The shaft 40 is rotatably supported in the housing 10 by bearings. The rotor 42 is fixed to the shaft 40.

[0030] The stator 44 comprises a stator core 46 and a stator coil 48. The stator core 46 is an annular body extending along the axial direction D1. The stator core 46 is composed of a plurality of electromagnetic steel sheets stacked in the axial direction D1. The stator core 46 has a first end face 46A on one axial side and a second end face 46B on the other axial side. As shown in Figure 2, the stator core 46 comprises a cylindrical core body portion 50 and a plurality of core fixing portions 52, 54, 56 that protrude radially outward in the direction D2 from the outer circumferential surface of the core body portion 50. The plurality of core fixing portions 52, 54, 56 are arranged at equal intervals in the circumferential direction D3. The core fixing portions 52, 54, 56 are provided with core fixing holes 52A, 54A, 56A. As shown in Figure 3, the core fixing holes 52A, 54A, 56A extend along the axial direction D1. The core fixing holes 52A, 54A, and 56A penetrate the stator core 46 from the first end face 46A to the second end face 46B.

[0031] The stator coil 48 in Figure 1 is wound around the stator core 46. The stator coil 48 includes a U-phase coil, a V-phase coil, and a W-phase coil. The stator coil 48 has a first coil end 48A and a second coil end 48B. The first coil end 48A protrudes from the first end face 46A of the stator core 46 to one axial side. The second coil end 48B protrudes from the second end face 46B of the stator core 46 to the other axial side.

[0032] The busbar module 14 is positioned axially to one side of the stator core 46 in the axial direction D1. The busbar module 14 faces the first coil end 48A from the outside in the radial direction D2. The busbar module 14 is connected to the first coil end 48A of the stator coil 48.

[0033] The busbar module 14 comprises a plurality of motor busbars 60, a terminal block 62, and a plurality of intermediate busbars 64. As shown in Figure 4, the terminal block 62 extends along the circumferential direction D3 on the outside of the radial direction D2 of the first coil end 48A. Note that the plurality of motor busbars 60 and the plurality of intermediate busbars 64 are omitted in Figure 4. It can also be said that the terminal block 62 is positioned above the first coil end 48A. For example, the terminal block 62 is made of an insulator such as a resin material.

[0034] Each of the motor busbars 60 in Figure 1 is a plate-shaped member, formed using a conductive material such as metal. One end of each of the motor busbars 60 is fixed to a terminal block 62, and the other end is welded to the U-phase coil, V-phase coil, and W-phase coil of the stator core 46.

[0035] Each of the relay busbars 64 is a plate-shaped member, formed using a conductive material such as metal. One end of each of the relay busbars 64 is fixed to a terminal block 62, and the other end is electrically connected to an inverter 18.

[0036] As shown in Figure 4, the spacer 16 comprises a spacer body 70, a first spacer fixing part 72, and a second spacer fixing part 74. For example, the spacer 16 is made of an insulator such as a resin material. The spacer body 70 extends along the circumferential direction D3 between the core fixing part 52 (see Figure 2) and the core fixing part 54 (see Figure 2). The first spacer fixing part 72 is provided at one end of the spacer body 70 in the circumferential direction D3. The second spacer fixing part 74 is provided at the other end of the spacer body 70 in the circumferential direction D3.

[0037] As shown in Figure 1, the inner end of the spacer body 70 in the radial direction D2 is positioned between the first coil end 48A and the terminal block 62. In the radial direction D2, the position of the outer end of the spacer body 70 in the radial direction D2 coincides with the position of the outer end of the terminal block 62 in the radial direction D2. As shown in Figure 5, in the axial direction D1, the spacer body 70 is positioned between the first end face 46A of the stator core 46 and the terminal block 62 of the busbar module 14. The spacer body 70 comprises a bottom wall 76, a circumferential wall 78, and a spacer flow path 80. The terminal block 62 of the busbar module 14 is in contact with the circumferential wall 78. The spacer flow path 80 extends continuously in the circumferential direction D3 between the first spacer fixing part 72 and the second spacer fixing part 74. The spacer flow path 80 extends between a first spacer opening 80A located on the inner circumferential surface of the spacer body 70 and a second spacer opening 80B located on the outer circumferential surface of the spacer body 70. The second spacer opening 80B is oriented in a direction that forms an angle with respect to the radial direction D2. The second spacer opening 80B is oriented so that the oil discharged from the second spacer opening 80B is directed toward the lower part of the busbar module 14 of the first coil end 48A. For example, the second spacer opening 80B is inclined at 45 degrees with respect to the radial direction D2.

[0038] As shown in Figure 4, the first spacer fixing portion 72 protrudes outward in the radial direction D2 at one end of the spacer body portion 70 in the circumferential direction D3. The first spacer fixing portion 72 covers the core fixing portion 52 (see Figure 2) from one axial side. The first spacer fixing portion 72 has a first spacer fixing hole 82. As shown in Figure 3, the first spacer fixing hole 82 penetrates the first spacer fixing portion 72 in the axial direction D1. The fastening member 90 passes through the first spacer fixing hole 82 and the core fixing hole 52A and is screwed into the threaded portion 20C of the first housing 20.

[0039] As shown in Figure 4, the second spacer fixing portion 74 protrudes outward in the radial direction D2 at the other end of the spacer body portion 70 in the circumferential direction D3. The second spacer fixing portion 74 covers the core fixing portion 54 (see Figure 2) from one axial side. The second spacer fixing portion 74 has a second spacer fixing hole 84. The second spacer fixing hole 84 penetrates the second spacer fixing portion 74 in the axial direction D1. The fastening member 90 (see Figure 3) passes through the second spacer fixing hole 84 and the core fixing hole 54A and is screwed into the threaded portion of the first housing 20. The spacer 16 and the stator core 46 are fastened together to the first housing 20 by multiple fastening members 90.

[0040] Referring to Figure 5, the flow of oil supplied to the first coil end 48A will be explained. First, oil is supplied to the first axial flow path 24 of the first housing 20. Of the radial flow paths 26A to 26D of the first housing 20, the radial flow path 26B is located above the spacer 16. Therefore, the oil discharged from the radial flow path 26B is supplied to the spacer 16. The oil supplied to the spacer 16 is supplied to the first coil end 48A through the spacer flow path 80 of the spacer 16. Since the second spacer opening 80B is oriented in a direction that forms an angle with respect to the radial direction D2, the oil discharged from the spacer flow path 80 is supplied to the lower part of the busbar module 14 of the first coil end 48A.

[0041] Furthermore, the radial flow path 26A is located above the terminal block 62 of the busbar module 14. Therefore, the oil discharged from the radial flow path 26A reaches the upper surface of the terminal block 62. A portion of the oil that reaches the upper surface of the terminal block 62 flows toward the spacer 16. The oil that flows toward the spacer 16 is supplied to the lower part of the first coil end 48A of the busbar module 14, similar to the oil supplied to the spacer 16 from the radial flow path 26B.

[0042] As described above, the motor unit 2 comprises a housing 10, an annular stator core 46 housed in the housing 10 and extending along the axial direction D1, the stator core 46 having a first end face 46A (an example of an "end face") located on one side in the axial direction, a stator coil 48 provided on the stator core 46 and having a first coil end 48A (an example of a "coil end") protruding from the first end face 46A of the stator core 46, a busbar module 14 facing the first coil end 48A from the outside in the radial direction D2 perpendicular to the axial direction D1 and connected to the first coil end 48A of the stator coil 48, and a spacer 16 provided between the first end face 46A of the stator core 46 and the busbar module 14 in the axial direction D1. The housing 10 includes a radial flow path 26B (an example of a "first supply flow path") having an opening 27B (an example of a "housing opening") on the surface facing the spacer 16 in the radial direction D2, and the radial flow path 26B supplies oil (an example of a "refrigerant") toward the spacer 16. The spacer 16 includes a spacer flow path 80 (an example of a "second supply flow path") extending between a first spacer opening 80A on the inner circumferential surface of the spacer 16 and a second spacer opening 80B on the outer circumferential surface of the spacer 16, and the spacer flow path 80 supplies oil toward the first coil end 48A.

[0043] According to the above configuration, oil is supplied to the first coil end 48A by passing through the radial passage 26B of the housing 10 and the spacer passage 80 of the spacer 16. Thus, the first coil end 48A can be cooled.

[0044] Furthermore, the motor unit 2 includes a fastening member 90 (an example of the "first fastening member") that fastens the spacer 16 and the stator core 46 together to the housing 10.

[0045] According to the above configuration, it is possible to suppress the peeling of the multiple electrical steel sheets that make up the stator core 46.

[0046] Furthermore, the stator core 46 has a cylindrical core body portion 50 extending in the axial direction D1, and a core fixing portion 52 (an example of a "first core fixing portion") that protrudes radially outward in the direction D2 from the outer circumferential surface of the core body portion 50 and has a core fixing hole 52A (an example of a "first core fixing hole") through which the fastening member 90 passes. The spacer 16 has a spacer body portion 70 having a spacer flow path 80, and a first spacer fixing portion 72 having a first spacer fixing hole 82 through which the fastening member 90 passes.

[0047] According to the above configuration, the influence on the magnetism of the stator core 46 can be reduced.

[0048] Furthermore, the spacer body portion 70 extends along the circumferential direction D3. The first spacer fixing portion 72 is located at one end of the spacer body portion 70 in the circumferential direction D3.

[0049] According to the above configuration, the spacer 16 can be securely fixed to the housing 10.

[0050] Furthermore, the first spacer fixing portion 72 protrudes radially outward at one end in the circumferential direction D3 of the spacer body portion 70.

[0051] According to the above configuration, the spacer body 70 can be made smaller, and the spacer 16 can be securely fixed to the housing 10.

[0052] The motor unit 2 further includes a fastening member 90 (an example of a "second fastening member") that fastens the spacer 16 and the stator core 46 together to the housing 10. The stator core 46 further has a core fixing portion 54 (an example of a "second core fixing portion") that protrudes radially D2 outward from the outer circumferential surface of the core body portion 50 and has a core fixing hole 54A (an example of a "second core fixing hole") through which the fastening member 90 passes. The spacer 16 further has a second spacer fixing portion 74 that has a second spacer fixing hole 84 through which the fastening member 90 passes. The second spacer fixing portion 74 is located at the other end of the spacer body portion 70 in the circumferential direction D3.

[0053] According to the above configuration, the spacer 16 can be securely fixed to the housing 10.

[0054] Furthermore, the second spacer fixing portion 74 protrudes outward in the radial direction D2 at the other end of the spacer body portion 70 in the circumferential direction D3.

[0055] According to the above configuration, the spacer body 70 can be made smaller, and the spacer 16 can be securely fixed to the housing 10.

[0056] Furthermore, the second spacer opening 80B is provided over a predetermined range in the circumferential direction D3 of the spacer body 70.

[0057] According to the above configuration, the first coil end 48A can be cooled over a predetermined range. Therefore, the first coil end 48A can be thoroughly cooled.

[0058] Furthermore, the second spacer opening 80B is oriented in a direction that forms an angle with respect to the radial direction D2.

[0059] According to the above configuration, oil can be supplied to various parts of the first coil end 48A. Therefore, the first coil end 48A can be thoroughly cooled. In particular, in this embodiment, oil can be supplied to the part of the first coil end 48A located below the busbar module 14.

[0060] Furthermore, in this embodiment, the terminal block 62 of the busbar module 14 is not provided with a hole for supplying oil to the first coil end 48A. Therefore, compared to a configuration in which such a hole is provided in the terminal block 62 of the busbar module 14, the influence on the magnetism of the busbar module 14 can be reduced.

[0061] The specific examples of the technology disclosed in this specification have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples described above.

[0062] (First modified example) The spacer 16 and the stator core 46 may each be individually fixed to the housing 10.

[0063] (Second modified example) At least one of the core fixing holes 54A to 54C of the stator core 46 may be provided in the core body portion 50.

[0064] (Third Modification) At least one of the ends of the spacer 16 in the circumferential direction D3 does not have to protrude radially outward.

[0065] (Fourth modified example) The spacer 16 and the stator core 46 may be fastened together to the housing 10 by one fastening member or three or more fastening members.

[0066] (Fifth Modification) The spacer body 70 may have a plurality of spacer passages. In this modification, the angles of the oil supply ports of each spacer passage with respect to the radial direction D2 may be the same or different.

[0067] (Sixth variation) The second spacer opening 80B of the spacer body 70 may be parallel to the radial direction D2.

[0068] (Seventh Modification) The spacer body portion 70 of the spacer 16 may extend in a direction perpendicular to the vertical direction, specifically along the left-right direction in Figure 4.

[0069] Furthermore, the technical elements described herein or in the drawings demonstrate technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated herein or in the drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives constitutes technical usefulness in itself. [Explanation of Symbols]

[0070] 2: Motor unit, 10: Housing, 12: Motor, 14: Busbar module, 16: Spacer, 18: Inverter, 20: First housing, 20A, 20B: Opening, 20C: Threaded section, 22: Second housing, 22A, 22B: Opening, 24: First axial flow path, 26A-26D: Radial flow path, 27A-27D: Opening, 28: Second axial flow path, 40: Shaft, 42: Rotor, 44: Stator, 46: Stator core, 46A: First end face, 46B: Second end face, 48: Stator coil, 48 A: First coil end, 48B: Second coil end, 50: Core body, 52, 54, 56: Core fixing part, 52A, 54A, 56A: Core fixing hole, 60: Motor bus bar, 62: Terminal block, 64: Intermediate bus bar, 70: Spacer body, 72: First spacer fixing part, 74: Second spacer fixing part, 76: Bottom wall, 78: Circumferential wall, 80: Spacer flow path, 80A: First spacer opening, 80B: Second spacer opening, 82: First spacer fixing hole, 84: Second spacer fixing hole, 90: Fastening member, A: Rotating shaft

Claims

1. A motor unit, Housing and A stator core is housed in the aforementioned housing and is an annular body extending along the axial direction, the stator core having an end face located on one side in the axial direction, A stator coil is provided on the stator core and has coil ends protruding from the end face of the stator core, A busbar module is positioned opposite the coil end from the radially outer side perpendicular to the axial direction and connected to the coil end of the stator coil, In the axial direction, a spacer is provided between the end face of the stator core and the busbar module, The housing comprises a first supply channel having a housing opening on a surface facing the spacer in the radial direction, the first supply channel supplying refrigerant toward the spacer, The spacer comprises a second supply channel extending between a first spacer opening on the inner circumferential surface of the spacer and a second spacer opening on the outer circumferential surface of the spacer, the second supply channel supplying the refrigerant toward the coil end. Motor unit.

2. The motor unit according to claim 1, further comprising a first fastening member for fastening the spacer and the stator core together to the housing.

3. The stator core comprises a cylindrical core body portion extending in the axial direction, and a first core fixing portion that protrudes radially outward from the outer circumferential surface of the core body portion and has a first core fixing hole through which the first fastening member passes. The motor unit according to claim 2, wherein the spacer comprises a spacer body having the second supply channel and a first spacer fixing portion having a first spacer fixing hole through which the first fastening member passes.

4. The spacer body extends along the circumferential direction perpendicular to the axial and radial directions, The motor unit according to claim 3, wherein the first spacer fixing portion is located at one end of the spacer body portion in the circumferential direction.

5. The motor unit according to claim 4, wherein the first spacer fixing portion protrudes radially outward from one end of the spacer body in the circumferential direction.

6. The system further comprises a second fastening member that fastens the spacer and the stator core together to the housing, The stator core further has a second core fixing portion that protrudes radially outward from the outer circumferential surface of the core body portion and has a second core fixing hole through which the second fastening member passes. The spacer further has a second spacer fixing portion having a second spacer fixing hole through which the second fastening member passes, The motor unit according to claim 4, wherein the second spacer fixing portion is located at the other end of the spacer body portion in the circumferential direction.

7. The motor unit according to claim 6, wherein the second spacer fixing portion protrudes radially outward from the other end of the spacer body in the circumferential direction.

8. The motor unit according to claim 4, wherein the second spacer opening is provided over a predetermined range in the circumferential direction of the spacer body.

9. The motor unit according to claim 1, wherein the second spacer opening is oriented in a direction that forms an angle with respect to the radial direction.

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