Motors, electric vehicles

Abstract

To provide a motor and an electric vehicle for improving heat dissipation of a coil portion.SOLUTION: A motor 1 includes a rotor 2 and a stator 3. The rotor 2 is rotatable around a central axis CA extending in an axial direction. The stator 3 has a stator core 31 facing the rotor 2 in a radial direction. The stator core 31 has a core back portion 311 and a tooth portion 312. The core back portion 311 surrounds the central axis CA. The tooth portion 312 extends from the core back portion 311 in the radial direction. The stator 3 further includes a deformable heat dissipating member 33 and a coil portion 34. The heat dissipating member 33 is placed on the outer side of the tooth portion 312 in a direction perpendicular to the radial direction. The coil portion 34 has a conducting wire 341. The conducting wire 341 is placed on the tooth portion 312 via the heat dissipating member 33.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a motor and an electric vehicle.

Background Art

[0002] In a conventional motor, a coil portion of a stator is arranged by winding a wire around a stator core insulated with resin or the like. (For example, refer to Japanese Patent Application Laid-Open No. 2013-078251)

[0003] Also, in Japanese Patent Application Laid-Open No. 2013-078251, a mold resin is filled between the stator, the housing, and the bracket.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, a gap where air usually exists occurs between the innermost side of the coil portion (for example, the wire arranged on the surface of the insulator or the stator core) and the surface of the insulator or the stator core. Therefore, depending on the volume of the gap, the thermal resistance between the coil portion and the stator core increases, and there is a risk that the heat dissipation property of the coil portion decreases.

[0006] An object of the present invention is to improve the heat dissipation property of the coil portion.

Means for Solving the Problems

[0007] An exemplary motor of the present invention comprises a rotor and a stator. The rotor is rotatable about a central axis extending in the axial direction. The stator has a stator core radially opposite to the rotor. The stator core has a core back portion and a teeth portion. The core back portion surrounds the central axis. The teeth portion extends radially from the core back portion. The stator further comprises a deformable heat dissipation member and a coil portion. The heat dissipation member is positioned on the outside of the teeth portion in a direction perpendicular to the radial direction. The coil portion has a conductor. The conductor is positioned in the teeth portion via the heat dissipation member.

[0008] An exemplary electric vehicle of the present invention comprises the above-described motor. [Effects of the Invention]

[0009] According to the exemplary motor and electric vehicle of the present invention, the heat dissipation of the coil section can be improved. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a cross-sectional view showing an example of a motor configuration. [Figure 2] Figure 2 is a perspective view showing an example of the core piece configuration. [Figure 3A] Figure 3A is a cross-sectional view showing a first example of the arrangement of heat dissipation members as seen from the radial direction. [Figure 3B] Figure 3B is a cross-sectional view showing a first example of the arrangement of heat dissipation members as seen from the axial direction. [Figure 3C] Figure 3C is a cross-sectional view showing a first example of the arrangement of heat dissipation members as seen from the circumferential direction. [Figure 4A] Figure 4A is a cross-sectional view showing a first modified example of the first arrangement of heat dissipation members as seen from the radial direction. [Figure 4B] Figure 4B is a cross-sectional view showing a second modified example of the first arrangement of heat dissipation members as seen from the radial direction. [Figure 5A] Figure 5A is a cross-sectional view showing a third modified example of the first arrangement of heat dissipation members as seen from the axial direction. [Figure 5B] FIG. 5B is a cross-sectional view showing a fourth modification of the first arrangement example of the heat radiating member as viewed from the axial direction. [Figure 6A] FIG. 6A is a cross-sectional view showing a second arrangement example of the heat radiating member as viewed from the radial direction. [Figure 6B] FIG. 6B is a cross-sectional view showing a second arrangement example of the heat radiating member as viewed from the axial direction. [Figure 6C] FIG. 6C is a cross-sectional view showing a second arrangement example of the heat radiating member as viewed from the circumferential direction. [Figure 7] FIG. 7 is a cross-sectional view showing a third arrangement example of the heat radiating member as viewed from the radial direction. [Figure 8] FIG. 8 is a cross-sectional view showing a fourth arrangement example of the heat radiating member as viewed from the radial direction. [Figure 9] FIG. 9 is a cross-sectional view showing a fifth arrangement example of the heat radiating member as viewed from the radial direction. [Figure 10] FIG. 10 is a diagram showing a configuration example of an electric vehicle.

DETAILED DESCRIPTION OF THE INVENTION

[0011] Exemplary embodiments will be described below with reference to the drawings.

[0012] In this specification, in the motor 1, the direction parallel to the central axis CA is referred to as the "axial direction Da". Among the axial directions Da, the direction from the bracket 43 to the lid portion 42, which will be described later, is referred to as the "one axial direction Da1", and the direction from the lid portion 42 to the bracket 43 is referred to as the "other axial direction Da2". Further, the direction orthogonal to the central axis CA is referred to as the "radial direction Dd", and the rotational direction around the central axis CA is referred to as the "circumferential direction Dr". Among the radial directions Dd, the direction approaching the central axis CA is referred to as the "inward radial direction Di", and the direction away from the central axis CA is referred to as the "outward radial direction Do".

[0013] In any component, among the predetermined directions, the direction from the central portion to the end portion of the component is referred to as the outward direction in the predetermined direction, and the direction from the end portion to the central portion of the component is referred to as the inward direction in the predetermined direction. For example, among the axial directions Da, the direction from the central portion to the outer axial end portion of the component is referred to as the "axial outward direction", and the direction from the outer axial end portion to the central portion of the component is referred to as the "axial inward direction". Also, among the circumferential directions Dr, the direction from the central portion to the outer circumferential end portion of the component is referred to as the "circumferential outward direction", and the direction from the outer circumferential end portion to the central portion of the component is referred to as the "circumferential inward direction".

[0014] In this specification, "annular" includes not only a shape that is continuously connected without a break over the entire circumferential direction Dr centered on the central axis CA, but also a shape having one or more breaks in a part of the entire circumferential direction Dr centered on the central axis CA. Also included is a shape that draws a closed curve on a curved surface that intersects the central axis CA centered on the central axis CA.

[0015] In the positional relationship between any one of the azimuth, line, and plane and any other one, "parallel" includes not only a state where the two do not intersect at all no matter how far they are extended, but also a state where they are substantially parallel. Also, "perpendicular" and "orthogonal" each include not only a state where the two intersect at 90 degrees with each other, but also a state where they are substantially perpendicular and a state where they are substantially orthogonal. That is, "parallel", "perpendicular", and "orthogonal" each include a state where there is an angular deviation within a range that does not deviate from the gist of the present invention in the positional relationship between the two.

[0016] These are merely names used for explanation purposes and are not intended to limit the actual positional relationship, direction, and name, etc.

[0017] <1. Motor 1> FIG. 1 is a cross-sectional view showing a configuration example of the motor 1. FIG. 1 shows the cross-sectional structure of the motor 1 cut by a virtual plane including the central axis CA. In the present embodiment, the motor 1 is a brushless motor that uses an alternating current of three phases (U phase, V phase, W phase) as a drive current.

[0018] As shown in Figure 1, the motor 1 comprises a rotor 2, a stator 3, a housing 4, and a circuit board 5.

[0019] <1-1. Rotor 2> The rotor 2 is rotatable about a central axis CA that extends in the axial direction Da. As described above, the motor 1 includes the rotor 2. The rotor 2 has a shaft 10, a rotor core 21, a magnet 22, and a balance weight 23.

[0020] The shaft 10 is cylindrical in shape and extends axially in Da along the central axis CA.

[0021] The rotor core 21 is fixed to the radially outer end of the shaft 10 and extends axially Da surrounding the shaft 10. The rotor core 21 is formed using a magnetic material and functions as a yoke for the magnet 22. In this embodiment, the rotor core 21 is a laminate in which annular electromagnetic steel sheets extending radially Dd are stacked axially Da.

[0022] The magnet 22 is positioned at the radially outer end of the rotor core 21. In the magnet 22, opposing magnetic poles (N pole and S pole) are arranged alternately in the circumferential direction Dr. The magnet 22 may be an annular member surrounding the central axis CA, or it may be a configuration including multiple magnetic pieces arranged in the circumferential direction Dr.

[0023] The balance weight 23 is a component used to adjust the rotational balance of the rotor 2. The balance weight 23 can be made of, for example, a metal material, a resin material, or a composite resin material containing ceramic powder such as alumina. The balance weight 23 is positioned on the axial outer end face of the rotor core 21.

[0024] <1-2.Status 3> The stator 3 includes a stator core 31, an insulator 32, a heat dissipation member 33, and a coil section 34. As described above, the motor 1 is equipped with the stator 3.

[0025] The stator core 31 faces the rotor 2 in the radial direction Dd. In this embodiment, the stator 3 is positioned radially outward Do from the rotor 2 and surrounds the rotor 2. The stator core 31 has a plurality of core pieces 310 arranged in the circumferential direction Dr. Each core piece 310 is formed using a magnetic material, and in this embodiment, it is a laminate in which electromagnetic steel sheets are stacked in the axial direction Da.

[0026] Figure 2 is a perspective view showing an example of the configuration of the core piece 310. Note that the coil portion 34 is omitted from Figure 2 for clarity of the configuration. As shown in Figure 2, the core piece 310 has a core back portion 311 and a teeth portion 312. In other words, the stator core 31 has a core back portion 311 and a teeth portion 312.

[0027] The core back portion 311 is fixed to the radially inner surface of the cylindrical portion 41 of the housing 4, which will be described later. The core back portion 311 surrounds the central axis CA. More specifically, the circumferential outer ends of adjacent core back portions 311 in the circumferential direction Dr are connected, so that the core pieces 310 are arranged in an annular shape surrounding the rotor 2.

[0028] The teeth portion 312 extends radially Dd from the core back portion 311. More specifically, in each core piece 310, the teeth portion 312 extends radially Dd from the core back portion 311 toward the rotor 2, and in this embodiment extends radially inward Di. Between adjacent teeth portions 312 in the circumferential Dr direction, slots (not shown) are arranged to accommodate a portion of the coil portion 34.

[0029] Furthermore, as shown in Figure 2, the core piece 310 further has an umbrella portion 313. In other words, the stator core 31 further has an umbrella portion 313. The umbrella portion 313 extends circumferentially outward from the end of the teeth portion 312 in the radial direction Dd opposite to the core back portion 311. In this embodiment, the umbrella portion 313 extends from the radially inward end of the teeth portion 312 in one and the other circumferential directions.

[0030] In this embodiment, the stator core 31 consists of a plurality of core pieces 310 arranged in the circumferential direction Dr. However, this example does not exclude a configuration in which the stator core 31 is a single component. For example, the core back portion 311 of the stator core 31 may be cylindrical with respect to the central axis CA. Also, each of the plurality of teeth portions 312 arranged in the circumferential direction Dr may extend radially Dd from the cylindrical core back portion 311 toward the rotor 2.

[0031] The insulator 32 is made of an electrically insulating material such as resin and is placed on the stator core 31. For example, the insulator 32 is placed on the teeth portion 312 and covers the surface of the portion of the teeth portion 312 where the coil portion 34 is placed. Alternatively, the insulator 32 is placed on the core back portion 311 and covers its radially inner surface.

[0032] The insulator 32 has grooves 320. As shown in Figure 2, the grooves 320 are recessed from the outside inward in a direction perpendicular to the radial direction Dd. The grooves 320 are located on the surface of the insulator 32 where the coil portion 34 of the teeth portion 312 is positioned. Multiple grooves 320 extend around the teeth portion 312 and are arranged in the radial direction Dd. The grooves 320 accommodate the inner portion of the conductor 341 of the coil portion 34, which will be described later, that is positioned on the insulator 32. By positioning the grooves 320 on the surface of the insulator 32, the conductor 341 can be wound along the grooves 320. Therefore, misalignment of the winding position of the conductor 341 can be prevented. Thus, a dense coil portion 34 can be stably formed. In addition, since the portion of the conductor 341 that contacts the insulator 32 can be accommodated within the grooves 320, the gap between the surface of the insulator 32 and the conductor 341 can be reduced.

[0033] For example, the insulator 32 is fitted onto the core piece 310 and electrically insulates the core piece 310 and the coil portion 34. The insulator 32 may also be formed integrally with the core piece 310 by insert molding.

[0034] Furthermore, the embodiment is not limited to the examples provided, and at least one core piece 310 may omit the insulator 32.

[0035] The heat dissipation member 33 is deformable and is positioned on the outer side of the teeth portion 312 in a direction perpendicular to the radial direction Dd. Further configuration of the heat dissipation member 33 will be described later.

[0036] The coil section 34 is positioned on the stator core 31. More specifically, in each core piece 310, the coil section 34 is positioned on the teeth section 312 of each core piece 310. When a drive current is supplied to each coil section 34, the stator 3 is energized and drives the rotor 2.

[0037] The coil section 34 has a conductor 341. The conductor 341 is arranged on the stator core 31 via a heat dissipation member 33. More specifically, the heat dissipation member 33 is arranged on the side surface of the teeth section 312 in a direction perpendicular to the radial direction Dd. The conductor 341 is arranged on the heat dissipation member 33.

[0038] In this way, the conductor 341 of the coil section 34 is wound around the teeth section 312 while being embedded in the heat dissipation member 33 due to the tension during winding. At this time, as the conductor 341 is embedded in the heat dissipation member 33, no gap in which air exists is formed between the heat dissipation member 33 and the coil section 34, and the heat dissipation member 33 can be made to be in close contact with the conductor 341. Furthermore, the contact area between the heat dissipation member 33 and the coil section 34 is increased. Therefore, the heat transfer performance from the coil section 34 to the teeth section 312 via the heat dissipation member 33 is improved. Thus, the heat dissipation performance of the coil section 34 can be improved with a simple configuration.

[0039] Furthermore, compared to configurations such as molded motors in which molded resin is filled between the stator and housing, the heat dissipation of the coil section 34 can be improved using a simpler method. For example, in the molded motor described above, molds are required in the process of arranging the molded resin, and large-scale equipment such as a device for heat-curing the resin is also required. In contrast, in the motor 1 of this embodiment, the heat dissipation of the coil section 34 can be improved using a simple method without requiring molds or large-scale equipment.

[0040] In this embodiment, the conductor 341 is further arranged on the stator core 31 via an insulator 32. Specifically, a heat dissipation member 33 is arranged on a portion of the side surface of the teeth portion 312 in a direction perpendicular to the radial direction Dd, and an insulator 32 is arranged on another portion of the surface. The conductor 341 is also arranged on the insulator 32. The conductor 341 is, for example, an enamel-coated copper wire or a metal wire covered with an insulating material.

[0041] <1-3. Housing 4> The housing 4 accommodates the rotor 2 and the stator 3. The housing 4 has a cylindrical portion 41, a lid portion 42, a bracket 43, a first bearing holder 44, and a second bearing holder 45.

[0042] The cylindrical portion 41 extends in the axial direction Da. The cylindrical portion 41 is a cylindrical body that surrounds the rotor 2 and the stator 3, and holds the stator 3. The stator core 31 is positioned on the radially inner surface of the cylindrical portion 41.

[0043] The cover portion 42 extends radially inward Di from one axial end of the cylindrical portion 41. The cover portion 42 is positioned axially Da1 relative to the stator core 31. In this embodiment, the cover portion 42 is integrated with the cylindrical portion 41, but it may be a separate component from the cylindrical portion 41.

[0044] An opening 421 is located in the center of the lid portion 42. The shaft 10 is inserted through the opening 421. The portion of the shaft 10 on one axial side Da1 protrudes to the outside of the motor 1 through the opening 421.

[0045] The bracket 43 is positioned on the other axial side Da2 of the stator core 31 and extends in a direction intersecting the axial direction Da. The bracket 43 is attached to the other axial end of the cylindrical portion 41 and closes the other axial end of the cylindrical portion 41.

[0046] The first bearing holder 44 extends axially Da from the cover portion 42 and surrounds the portion of the shaft 10 on one axial side Da1. In this embodiment, the first bearing holder 44 extends axially Da2 from the cover portion 42. However, it is not limited to this example, and the first bearing holder 44 may extend axially Da1 from the cover portion 42, or it may extend axially Da1 and Da2 from the cover portion 42, respectively. The interior of the first bearing holder 44 is connected to the opening 421. A first bearing 441 is arranged inside the first bearing holder 44. The first bearing holder 44 rotatably holds the shaft 10 via the first bearing 441.

[0047] The second bearing holder 45 extends from the bracket 43 in one axial direction Da1 and surrounds the other axial direction Da2 of the shaft 10. A second bearing 451 is positioned inside the second bearing holder 45. The second bearing holder 45 rotatably holds the shaft 10 via the second bearing 451.

[0048] In this embodiment, the first bearing 441 and the second bearing 451 are ball bearings. However, the embodiment is not limited to this example, and at least one of them may be a bearing other than a ball bearing, for example, a sleeve bearing.

[0049] <1-4. Substrate 5> The substrate 5 extends in a direction intersecting the axial direction Da and is fixed to the other axial end face of the bracket 43. Conductors 341, which are drawn out from the housing 4 to the outside, are connected to the substrate 5. The substrate 5 is equipped with the drive circuit for the stator 3 (not shown) and other components.

[0050] <2. Heat dissipation member 33> Next, the details of the heat dissipation member 33 will be described with reference to Figures 1 to 9. Figure 3A is a cross-sectional view showing a first arrangement example of the heat dissipation member 33 as viewed from the radial direction Dd. Figure 3B is a cross-sectional view showing a first arrangement example of the heat dissipation member 33 as viewed from the axial direction Da. Figure 3C is a cross-sectional view showing a first arrangement example of the heat dissipation member 33 as viewed from the circumferential direction Dr. Figure 4A is a cross-sectional view showing a first modified example of the first arrangement example of the heat dissipation member 33 as viewed from the radial direction. Figure 4B is a cross-sectional view showing a second modified example of the first arrangement example of the heat dissipation member 33 as viewed from the radial direction. Figure 5A is a cross-sectional view showing a third modified example of the first arrangement example of the heat dissipation member 33 as viewed from the axial direction. Figure 5B is a cross-sectional view showing a fourth modified example of the first arrangement example of the heat dissipation member 33 as viewed from the axial direction. Figure 6A is a cross-sectional view showing a second arrangement example of the heat dissipation member 33 as viewed from the radial direction Dd. Figure 6B is a cross-sectional view showing a second arrangement example of the heat dissipation member 33 as viewed from the axial direction Da. Figure 6C is a cross-sectional view showing a second arrangement example of the heat dissipation member 33 as seen from the circumferential direction Dr. Figure 7 is a cross-sectional view showing a third arrangement example of the heat dissipation member 33 as seen from the radial direction Dd. Figure 8 is a cross-sectional view showing a fourth arrangement example of the heat dissipation member 33 as seen from the radial direction Dd. Figure 9 is a cross-sectional view showing a fifth arrangement example of the heat dissipation member 33 as seen from the radial direction Dd. Figures 3A, 6A, and 7 to 9 show cross-sections of the teeth portion 312 along the dashed line IIIA in Figure 2. Figures 3B, 4A to 4B, and 6B show the main parts of the cross-section of the teeth portion 312 along the dashed line IIIB in Figure 2. Figures 3C, 5A to 5B, and 6C show the main parts of the cross-section of the teeth portion 312 along the dashed line IIIC in Figure 2.

[0051] In this embodiment, the heat dissipation member 33 is positioned on the circumferentially outward side of the teeth portion 312 and on the axially outward side of the teeth portion 312. More specifically, the heat dissipation member 33 is positioned on one circumferential side of one circumferential end face of the teeth portion 312 and on the other circumferential side of the other circumferential end face of the teeth portion 312. Furthermore, the heat dissipation member 33 is positioned on one axial side Da1 of one axial end face of the teeth portion 312 and on the other axial side Da2 of the other axial end face of the teeth portion 312.

[0052] However, this example does not exclude configurations in which the heat dissipation member 33 is positioned only on either the circumferentially outward side of the teeth portion 312 or the axially outward side of the teeth portion 312. For example, the heat dissipation member 33 may be positioned circumferentially outward from the circumferential outer end face of the teeth portion 312, but not necessarily on the axially outward side of the axially outward end face of the teeth portion 312. Also, the heat dissipation member 33 may be positioned axially outward from the axially outward end face of the teeth portion 312, but not necessarily on the circumferentially outward side of the teeth portion 312.

[0053] Furthermore, in this embodiment, the heat dissipation members 33 are arranged on both sides of the teeth portion 312 in the circumferential direction Dr. However, the embodiment is not limited to this example, and the heat dissipation members 33 may be arranged on only one side of the teeth portion 312 in the circumferential direction Dr. For example, the heat dissipation members 33 may be arranged on one side of the teeth portion 312 in the circumferential direction, but not on the other side.

[0054] Similarly, in this embodiment, the heat dissipation members 33 are arranged on both sides of the teeth portion 312 in the axial direction Da. However, the heat dissipation members 33 may be arranged on only one side of the teeth portion 312 in the axial direction Da. For example, the heat dissipation members 33 may be arranged on one axial side Da1 of the teeth portion 312, but not on the other axial side Da2 of the teeth portion 312. Alternatively, the heat dissipation members 33 may be arranged on the other axial side Da2 of the teeth portion 312, but not on the one axial side Da1 of the teeth portion 312.

[0055] Preferably, the heat dissipation member 33 is positioned at least on the circumferentially outward side of the teeth portion 312. In other words, the heat dissipation member 33 has a first heat dissipation member 331 positioned on the circumferentially outward side of the teeth portion 312. The first heat dissipation member 331 is positioned on at least one of the circumferential sides of the teeth portion 312. This improves the heat transfer from the coil portion 34 to the teeth portion 312 of the stator core 31 in the circumferential direction Dr. Also, for example, when the coil portion 34 is arranged in a concentrated winding, the tension acting on the conductor 341 when it is wound on the circumferentially outward side of the teeth portion 312 tends to be weaker than the tension when it is wound on the axially outward side of the teeth portion 312. Therefore, by positioning the heat dissipation member 33 on the circumferentially outward side of the teeth portion 312, the conductor 341 can be more firmly embedded in the heat dissipation member 33 and wound stably. Therefore, it is possible to prevent a gap from forming between the conductor 341 and the heat dissipation member 33 on the circumferentially outward side of the teeth portion 312.

[0056] Furthermore, the thickness of the first heat dissipation member 331, which is positioned on the circumferentially outward side of the teeth portion 312, may be greater than the thickness of the second heat dissipation member 332, which is positioned on the axially outward side of the teeth portion 312. This makes it easier for the conductor 341 to contact the heat dissipation member 33, thereby more reliably preventing gaps from forming between the conductor 341 and the heat dissipation member 33. However, this example does not exclude a configuration in which the thickness of the first heat dissipation member 331 is less than or equal to the thickness of the second heat dissipation member 332.

[0057] More preferably, the heat dissipation member 33 is further positioned on the axially outward side of the teeth portion 312. In other words, the heat dissipation member 33 has a second heat dissipation member 332 positioned on the axially outward side of the teeth portion 312. The second heat dissipation member 332 is positioned on at least one of the axial sides Da1 and Da2 of the teeth portion 312. This further improves the heat transfer from the coil portion 34 to the teeth portion 312 of the stator core 31 in the axial direction Da.

[0058] The heat dissipation member 33 can be positioned directly relative to the teeth portion 312. For example, in Figures 3A to 3C, the heat dissipation member 33 is in contact with the surface of the teeth portion 312. More specifically, in the portion of the teeth portion 312 where the coil portion 34 is positioned, the first heat dissipation member 331 is positioned directly relative to one circumferential end face and the other circumferential end face, respectively. The second heat dissipation member 332 is also positioned directly relative to one axial end face and the other axial end face, respectively. This shortens the heat transfer path between the coil portion 34 and the teeth portion 312 via the heat dissipation member 33, thereby lowering its thermal conductivity resistance. Consequently, the heat dissipation performance of the coil portion 34 can be further improved.

[0059] Preferably, as shown in Figures 2 and 3A to 3C, an insulator 32 is placed on a portion of the side surface of the teeth portion 312 in a direction perpendicular to the radial direction Dd. Furthermore, a heat dissipation member 33 is placed on another portion of the side surface of the teeth portion 312 in a direction perpendicular to the radial direction Dd. For example, on one circumferential end face and the other circumferential end face of the portion of the teeth portion 312 where the coil portion 34 is placed, a first heat dissipation member 331 is placed in a portion of that area, and an insulator 32 is placed in the other portion. Also, on one axial end face and the other axial end face of the portion of the teeth portion 312 where the coil portion 34 is placed, a second heat dissipation member 332 is placed in a portion of that area, and an insulator 32 is placed in the other portion. By placing the insulator 32 in the area of ​​the side surface of the teeth portion 312 where the heat dissipation member 33 is not placed, short circuits between the coil portion 34 and the teeth portion 312 can be prevented more reliably.

[0060] Preferably, as shown in Figure 3B, the insulator 32 has a first insulator portion 321 and a second insulator portion 322. The first insulator section 321 is an example of the "third insulator section" of the present invention. The second insulator section 322 is an example of the "fourth insulator section" of the present invention.

[0061] The first insulator portion 321 is positioned on the end face of the core back portion 311 on the coil portion 34 side in the radial direction Dd. In this embodiment, the first insulator portion 321 is positioned on the radially inner surface of the core back portion 311. The arrangement of the first insulator portion 321 allows for more reliable insulation between the core back portion 311 and the coil portion 34.

[0062] The second insulator portion 322 extends from the circumferential inner end of the first insulator portion 321 and is positioned at the radial end of the circumferential outer end face of the teeth portion 312 on the core back portion 311 side. In this embodiment, the second insulator portion 322 extends radially inward Di from the circumferential inner end of the first insulator portion 321 and is positioned at the radial outer end of the circumferential outer end face of the teeth portion 312.

[0063] At the end of the circumferential outer end face of the tooth portion 312 on the core back portion 311 side in the radial direction Dd, the heat dissipation member 33 overlaps with the second insulator portion 322 in the circumferential direction Dr. More specifically, at the radial outer end of the tooth portion 312, the first heat dissipation member 331 overlaps with the second insulator portion 322 in the circumferential direction Dr (more precisely, in the direction perpendicular to the axial direction Da and the radial direction Dd).

[0064] This ensures electrical insulation between the teeth portion 312 and the coil portion 34. For example, in Figure 3B, the radially outer end of the first heat dissipation member 331 is in contact with the first insulator portion 321. Now, let's consider the case where the second insulator portion 322 and the first heat dissipation member 331 do not overlap (especially when the second insulator portion 322 is omitted). In this case, when winding the conductor 341, at the aforementioned location, the conductor 341 may become embedded between the radially outer end of the first heat dissipation member 331 and the first insulator portion 321, potentially causing it to come into direct contact with the teeth portion 312. On the other hand, in Figure 3B, the second insulator portion 322 extending from the first insulator portion 321 overlaps with the radially outer end of the first heat dissipation member 331. Therefore, even if the conductor 341 is embedded between the radially outer end of the first heat dissipation member 331 and the first insulator portion 321, it will still make contact with the first insulator portion 321 and the second insulator portion 322, but will not make direct contact with the teeth portion 312. This prevents a decrease in electrical insulation between the teeth portion 312 and the conductor 341 (i.e., the coil portion 34).

[0065] Furthermore, preferably, at the circumferential outer end of the teeth portion 312, the position of the circumferential outer end face of the second insulator portion 322 on the first heat dissipation member 331 side is the same as the position of the circumferential outer end face of the teeth portion 312. More specifically, on one circumferential side of the teeth portion 312, the position of the circumferential end face of the second insulator portion 322 in the circumferential direction Dr (strictly speaking, the direction perpendicular to both the axial direction Da and the radial direction Dd) is the same as the circumferential end face of the teeth portion 312. Also, on the other circumferential side of the teeth portion 312, the position of the other circumferential end face of the second insulator portion 322 in the circumferential direction Dr (strictly speaking, the direction perpendicular to both the axial direction Da and the radial direction Dd) is the same as the other circumferential end face of the teeth portion 312. In this way, the first heat dissipation member 331 can be arranged in a planar shape without any unevenness. Therefore, the conductor 341 can be tightly wound without distorting the shape of the coil portion 34. However, this example does not exclude a configuration in which the position of the circumferential outer end surface of the second insulator portion 322 on the first heat dissipation member 331 side at the circumferential outer end of the tooth portion 312 is different from the position of the circumferential outer end surface of the tooth portion 312.

[0066] In Figure 3B, as described above, the radially outer end of the first heat dissipation member 331 is in contact with the first insulator portion 321. However, the example in Figure 3B does not exclude a configuration in which the radially outer end of the first heat dissipation member 331 is not in contact with the first insulator portion 321.

[0067] For example, as shown in Figure 4A, the radially outer end of the first heat dissipation member 331 may be separated radially inward Di from the first insulator portion 321. In this case, the radially outer end of the first heat dissipation member 331 may have a gap with the first insulator portion 321 and face it radially in the direction Dd (see Figure 4A). Alternatively, the radially outer end of the first heat dissipation member 331 may have a gap with a part of the second insulator portion 322 and face it radially in the direction Dd, or it may be in contact with a part of the second insulator portion 322 radially in the direction Dd.

[0068] Alternatively, as shown in Figure 4B, the radially outer end of the first heat dissipation member 331 may be bent outward in the circumferential direction, overlapping with at least the circumferentially inner portion of the first insulator portion 321 in the radial direction Dd, and covering this portion.

[0069] Furthermore, the examples in Figures 3B and 4A to 4B do not exclude a configuration in which the first heat dissipation member 331 does not overlap with the second insulator portion 322 at the radial outer end of the teeth portion 312. For example, the second insulator portion 322 may be omitted. In other words, the insulator 32 may have a configuration that does not include the second insulator portion 322.

[0070] Preferably, as shown in Figure 3B, the insulator 32 further comprises a third insulator portion 323 and a fourth insulator portion 324. The third insulator section 323 is an example of the "fifth insulator section" of the present invention. The fourth insulator section 324 is an example of the "sixth insulator section" of the present invention.

[0071] The third insulator portion 323 is positioned on the end face of the umbrella portion 313 on the coil portion 34 side in the radial direction Dd. In this embodiment, the third insulator portion 323 is positioned on the radially outer surface of the umbrella portion 313. The arrangement of the third insulator portion 323 allows for more reliable insulation between the umbrella portion 313 and the coil portion 34.

[0072] The fourth insulator portion 324 extends from the circumferential inner end of the third insulator portion 323 and is positioned at the end of the circumferential outer end face of the teeth portion 312 that is opposite to the core back portion 311 in the radial direction. In this embodiment, the fourth insulator portion 324 extends radially outward Do from the circumferential inner end of the third insulator portion 323 and is positioned at the radial inner end of the circumferential outer end face of the teeth portion 312.

[0073] At the end of the circumferential outer end face of the teeth portion 312 opposite to the core back portion 311 in the radial direction, the heat dissipation member 33 overlaps with the fourth insulator portion 324 in the circumferential direction Dr. More specifically, at the radial inner end of the teeth portion 312, the first heat dissipation member 331 overlaps with the fourth insulator portion 324 in the circumferential direction Dr (more precisely, in the direction perpendicular to the axial direction Da and the radial direction Dd).

[0074] This ensures electrical insulation between the teeth portion 312 and the coil portion 34. For example, in Figure 3B, the radially inner end of the first heat dissipation member 331 is in contact with the third insulator portion 323. Now, let's consider the case where the fourth insulator portion 324 and the first heat dissipation member 331 do not overlap (especially when the fourth insulator portion 324 is omitted). In this case, when winding the conductor 341, at the aforementioned location, the conductor 341 may become embedded between the radially inner end of the first heat dissipation member 331 and the third insulator portion 323, potentially causing it to come into direct contact with the teeth portion 312. On the other hand, in Figure 3B, the fourth insulator portion 324 extending from the third insulator portion 323 overlaps with the radially inner end of the first heat dissipation member 331. Therefore, even if the conductor 341 is embedded between the radial inner end of the first heat dissipation member 331 and the third insulator portion 323, it will still make contact with the third insulator portion 323 and the fourth insulator portion 324, but will not make direct contact with the teeth portion 312. This prevents a decrease in electrical insulation between the teeth portion 312 and the conductor 341 (i.e., the coil portion 34).

[0075] Furthermore, preferably, at the circumferential outer end of the teeth portion 312, the position of the circumferential outer end face of the fourth insulator portion 324 on the first heat dissipation member 331 side is the same as the position of the circumferential outer end face of the teeth portion 312. More specifically, on one circumferential side of the teeth portion 312, the position of the circumferential end face of the fourth insulator portion 324 in the circumferential direction (strictly speaking, the direction perpendicular to both the axial direction Da and the radial direction Dd) is the same as the circumferential end face of the teeth portion 312. Also, on the other circumferential side of the teeth portion 312, the position of the other circumferential end face of the fourth insulator portion 324 in the circumferential direction Dr (strictly speaking, the direction perpendicular to both the axial direction Da and the radial direction Dd) is the same as the other circumferential end face of the teeth portion 312. In this way, the first heat dissipation member 331 can be arranged in a planar shape without any unevenness. Therefore, the conductor 341 can be tightly wound without distorting the shape of the coil portion 34. However, this example does not exclude a configuration in which the position of the circumferential outer end surface of the fourth insulator portion 324 on the first heat dissipation member 331 side at the circumferential outer end of the tooth portion 312 is different from the position of the circumferential outer end surface of the tooth portion 312.

[0076] In Figure 3B, as described above, the radial inner end of the first heat dissipation member 331 is in contact with the third insulator portion 323. However, the example in Figure 3B does not exclude a configuration in which the radial inner end of the first heat dissipation member 331 is not in contact with the third insulator portion 323.

[0077] For example, as shown in Figure 4A, the radially inner end of the first heat dissipation member 331 may be separated radially outward Do from the third insulator portion 323. In this case, the radially inner end of the first heat dissipation member 331 may have a gap with the third insulator portion 323 and face radially Dd (see Figure 4A). Alternatively, the radially inner end of the first heat dissipation member 331 may have a gap with a part of the fourth insulator portion 324 and face radially Dd, or it may be in contact with a part of the fourth insulator portion 324 radially Dd.

[0078] Alternatively, as shown in Figure 4B, the radially inner end of the first heat dissipation member 331 may be bent outward in the circumferential direction, overlapping with at least the circumferentially inner portion of the third insulator portion 323 in the radial direction Dd, and covering this portion.

[0079] Furthermore, the examples in Figures 3B and 4A to 4B do not exclude a configuration in which the first heat dissipation member 331 does not overlap with the fourth insulator portion 324 at the radial inner end of the tooth portion 312. For example, the fourth insulator portion 324 may be omitted. In other words, the insulator 32 may have a configuration without the fourth insulator portion 324.

[0080] Preferably, as shown in Figure 3C, the insulator 32 further comprises a fifth insulator portion 325 and a sixth insulator portion 326. The fifth insulator section 325 is an example of the "first insulator section" of the present invention. The sixth insulator section 326 is an example of the "second insulator section" of the present invention.

[0081] The fifth insulator portion 325 is positioned on the axial outer end face of the core back portion 311. The fifth insulator portion 325 extends axially outward from the axial outer end face of the core back portion 311 and further extends in the circumferential direction Dr. The arrangement of the fifth insulator portion 325 prevents the conductor 341 from shifting radially outward Do.

[0082] The sixth insulator portion 326 extends from the axially inward end of the fifth insulator portion 325 and is positioned at the end of the axially outward end face of the teeth portion 312 on the core back portion 311 side in the radial direction Dd. In this embodiment, the sixth insulator portion 326 extends radially inward Di from the axially inward end of the fifth insulator portion 325 and is positioned at the radially outward end of the axially outward end face of the teeth portion 312.

[0083] At the end of the axial outer end face of the tooth portion 312 on the core back portion 311 side in the radial direction Dd, the heat dissipation member 33 overlaps with the sixth insulator portion 326 in the axial direction Da. More specifically, at the radial outer end of the tooth portion 312, the second heat dissipation member 332 overlaps with the sixth insulator portion 326 in the axial direction Da.

[0084] This ensures electrical insulation between the teeth portion 312 and the coil portion 34. For example, in Figure 3C, the radially outer end of the second heat dissipation member 332 is in contact with the fifth insulator portion 325. Now, let's consider the case where the sixth insulator portion 326 and the second heat dissipation member 332 do not overlap (especially when the sixth insulator portion 326 is omitted). In this case, when winding the conductor 341, at the aforementioned location, the conductor 341 may become embedded between the radially outer end of the second heat dissipation member 332 and the fifth insulator portion 325, potentially causing it to come into direct contact with the teeth portion 312. On the other hand, in Figure 3C, the sixth insulator portion 326 extending from the fifth insulator portion 325 overlaps with the radially outer end of the second heat dissipation member 332. Therefore, even if the conductor 341 is embedded between the radially outer end of the second heat dissipation member 332 and the fifth insulator portion 325, it will still make contact with the fifth insulator portion 325 and the sixth insulator portion 326, but will not make direct contact with the teeth portion 312. This prevents a decrease in electrical insulation between the teeth portion 312 and the conductor 341 (i.e., the coil portion 34).

[0085] Furthermore, preferably, at the axial outer end of the teeth portion 312, the axial position of the axial outer end face of the sixth insulator portion 326 on the second heat dissipation member 332 side is the same as the axial position of the axial outer end face of the teeth portion 312. More specifically, on one axial side Da1 of the teeth portion 312, the axial position of one axial end face of the sixth insulator portion 326 is the same as the axial end face of the teeth portion 312. Also, on the other axial side Da2 of the teeth portion 312, the position of the other axial end face of the sixth insulator portion 326 is the same as the other axial end face of the teeth portion 312. In this way, the second heat dissipation member 332 can be arranged in a planar shape without causing any unevenness. Therefore, the conductor 341 can be tightly wound without distorting the shape of the coil portion 34. However, this example does not exclude a configuration in which the position of the axial outer end face of the sixth insulator portion 326 on the second heat dissipation member 332 side at the axial outer end of the teeth portion 312 is different from the position of the axial outer end face of the teeth portion 312.

[0086] In Figure 3C, as described above, the radially outer end of the second heat dissipation member 332 is in contact with the fifth insulator portion 325. However, the example in Figure 3C does not exclude a configuration in which the radially outer end of the second heat dissipation member 332 is not in contact with the fifth insulator portion 325.

[0087] For example, as shown in Figure 5A, the radially outer end of the second heat dissipation member 332 may be separated radially inward Di from the fifth insulator portion 325. In this case, the radially outer end of the second heat dissipation member 332 may have a gap with the fifth insulator portion 325 and face it radially in the direction Dd (see Figure 5A). Alternatively, the radially outer end of the second heat dissipation member 332 may have a gap with a part of the sixth insulator portion 326 and face it radially in the direction Dd, or it may be in contact with a part of the sixth insulator portion 326 radially in the direction Dd.

[0088] Alternatively, as shown in Figure 5B, the radially outer end of the second heat dissipation member 332 may be bent outward in the axial direction, overlapping with at least the circumferentially inner portion of the fifth insulator portion 325 in the radial direction Dd, and covering this portion.

[0089] Furthermore, the examples in Figures 3C and 5A to 5B do not exclude a configuration in which the second heat dissipation member 332 does not overlap with the sixth insulator portion 326 at the radially outer end of the teeth portion 312. For example, the sixth insulator portion 326 may be omitted. In other words, the insulator 32 may have a configuration without the sixth insulator portion 326.

[0090] Preferably, as shown in Figure 3C, the insulator 32 further comprises a seventh insulator portion 327 and an eighth insulator portion 328. The seventh insulator section 327 is an example of the "seventh insulator section" of the present invention. The eighth insulator section 328 is an example of the "eighth insulator section" of the present invention.

[0091] The seventh insulator portion 327 is positioned on the axial outer end surface of the tooth portion 312 opposite to the core back portion 311 in the radial direction Dd, and on the axial outer end surface of the umbrella portion 313. The seventh insulator portion 327 extends axially outward from the tooth portion 312 opposite to the core back portion 311 in the radial direction Dd, and from the umbrella portion 313, and further extends in the circumferential direction Dr. The arrangement of the seventh insulator portion 327 prevents the conductor 341 from shifting radially inward Di.

[0092] The eighth insulator portion 328 extends from the axial inner end of the seventh insulator portion 327 and is positioned at the end of the axial outer end face of the teeth portion 312 opposite to the core back portion 311 in the radial direction Dd. In this embodiment, the eighth insulator portion 328 extends radially outward Do from the axial inner end of the seventh insulator portion 327 and is positioned at the radial inner end of the axial outer end face of the teeth portion 312.

[0093] At the end of the axial outer end face of the teeth portion 312 opposite to the core back portion 311 in the radial direction Dd, the heat dissipation member 33 overlaps with the eighth insulator portion 328 in the axial direction Da. More specifically, at the radial inner end of the teeth portion 312, the second heat dissipation member 332 overlaps with the eighth insulator portion 328 in the axial direction Da.

[0094] This ensures electrical insulation between the teeth portion 312 and the coil portion 34. For example, in Figure 3C, the radially inner end of the second heat dissipation member 332 is in contact with the seventh insulator portion 327. Now, let's consider the case where the eighth insulator portion 328 and the second heat dissipation member 332 do not overlap (especially when the eighth insulator portion 328 is omitted). In this case, when winding the conductor 341, at the aforementioned location, the conductor 341 may become embedded between the radially inner end of the second heat dissipation member 332 and the seventh insulator portion 327, potentially causing it to come into direct contact with the teeth portion 312. On the other hand, in Figure 3C, the eighth insulator portion 328 extending from the seventh insulator portion 327 and the radially inner end of the second heat dissipation member 332 overlap. Therefore, even if the conductor 341 is embedded between the radial inner end of the second heat dissipation member 332 and the seventh insulator portion 327, it will still make contact with the seventh insulator portion 327 and the eighth insulator portion 328, but will not make direct contact with the teeth portion 312. This prevents a decrease in electrical insulation between the teeth portion 312 and the conductor 341 (i.e., the coil portion 34).

[0095] Furthermore, preferably, at the axial outer end of the teeth portion 312, the position of the axial outer end face of the eighth insulator portion 328 on the second heat dissipation member 332 side is the same as the position of the axial outer end face of the teeth portion 312. More specifically, on one axial side Da1 of the teeth portion 312, the position of one axial end face of the eighth insulator portion 328 is the same as the axial end face of the teeth portion 312. Also, on the other axial side Da2 of the teeth portion 312, the position of the other axial end face of the eighth insulator portion 328 is the same as the other axial end face of the teeth portion 312. In this way, the second heat dissipation member 332 can be arranged in a planar shape without causing any unevenness. Therefore, the conductor 341 can be tightly wound without distorting the shape of the coil portion 34. However, this example does not exclude a configuration in which the axial position of the axial outer end face of the eighth insulator portion 328 on the second heat dissipation member 332 side differs from the position of the axial outer end face of the teeth portion 312 at the axial outer end of the teeth portion 312.

[0096] In Figure 3C, as described above, the radial inner end of the second heat dissipation member 332 is in contact with the seventh insulator portion 327. However, the example in Figure 3C does not exclude a configuration in which the radial inner end of the second heat dissipation member 332 is not in contact with the seventh insulator portion 327.

[0097] For example, as shown in Figure 5A, the radially inner end of the second heat dissipation member 332 may be separated radially outward Do from the seventh insulator portion 327. In this case, the radially inner end of the second heat dissipation member 332 may have a gap with the seventh insulator portion 327 and face radially Dd (see Figure 5A). Alternatively, the radially inner end of the second heat dissipation member 332 may have a gap with a part of the eighth insulator portion 328 and face radially Dd, or it may be in contact with a part of the eighth insulator portion 328 radially Dd.

[0098] Alternatively, as shown in Figure 5B, the radially inner end of the second heat dissipation member 332 may be bent axially outward, overlapping with at least the circumferentially inner portion of the seventh insulator portion 327 in the radial direction Dd, and covering this portion.

[0099] Furthermore, the examples in Figures 3C and 5A to 5B do not exclude a configuration in which the second heat dissipation member 332 does not overlap with the eighth insulator portion 328 at the radial inner end of the teeth portion 312. For example, the eighth insulator portion 328 may be omitted. In other words, the insulator 32 may have a configuration that does not include the eighth insulator portion 328.

[0100] <2-1-2. Second placement example> Alternatively, the heat dissipation member 33 can be placed on the teeth portion 312 via an insulator 32. For example, in Figures 6A to 6C, an insulator 32 is placed on the surface of the portion of the teeth portion 312 where the coil portion 34 is placed. The heat dissipation member 33 is placed on this insulator 32 on one circumferential end face, one circumferential end face, one axial end face, and the other axial end face of the above portion. In other words, in the second arrangement example in Figures 6A to 6C, the insulator 32 has a ninth insulator portion 329 and a tenth insulator portion 3210 instead of the second, fourth, sixth, and eighth insulator portions 322, 324, 326, and 328.

[0101] The ninth insulator portion 329 is positioned on the circumferential outer end face of the portion of the teeth portion 312 where the coil portion 34 is located. The radial outer end of the ninth insulator portion 329 is connected to the circumferential inner end of the first insulator portion 321. The radial inner end of the ninth insulator portion 329 is connected to the circumferential inner end of the third insulator portion 323. The first heat dissipation member 331 is positioned on the ninth insulator portion 329.

[0102] The 10th insulator portion 3210 is positioned on the axial outer end face of the portion of the teeth portion 312 where the coil portion 34 is located. The radial outer end of the 10th insulator portion 3210 is connected to the circumferential inner end of the 5th insulator portion 325. The radial inner end of the 10th insulator portion 3210 is connected to the circumferential inner end of the 7th insulator portion 327. The 2nd heat dissipation member 332 is positioned on the 10th insulator portion 3210.

[0103] This allows for a simpler configuration of the heat dissipation member 33, thereby increasing the heat dissipation area of ​​the coil section 34.

[0104] In Figure 6B, the radially outer end of the first heat dissipation member 331 is in contact with the first insulator portion 321. However, the example in Figure 6B does not exclude configurations in which the radially outer end of the first heat dissipation member 331 is not in contact with the first insulator portion 321. For example, the radially outer end of the first heat dissipation member 331 may be separated radially inward Di from the first insulator portion 321, similar to Figure 4A. In this case, the radially outer end of the first heat dissipation member 331 may have a gap with the first insulator portion 321 and face it radially in the direction Dd. Alternatively, the radially outer end of the first heat dissipation member 331 may have a gap with a part of the ninth insulator portion 329 and face it radially in the direction Dd, or it may be in contact with a part of the ninth insulator portion 329 radially in the direction Dd. Alternatively, the radially outer end of the first heat dissipation member 331 may be bent outward in the circumferential direction, as in Figure 4B, and overlap with at least the circumferentially inner portion of the first insulator portion 321 in the radial direction Dd, thereby covering this portion.

[0105] Furthermore, in Figure 6B, the radially inner end of the first heat dissipation member 331 is in contact with the third insulator portion 323. However, the example in Figure 6B does not exclude a configuration in which the radially inner end of the first heat dissipation member 331 is not in contact with the third insulator portion 323. For example, the radially inner end of the first heat dissipation member 331 may be separated radially outward Do from the third insulator portion 323, similar to Figure 4A. In this case, the radially inner end of the first heat dissipation member 331 may have a gap with the third insulator portion 323 and face it radially Dd. Alternatively, the radially outer end of the first heat dissipation member 331 may have a gap with a part of the ninth insulator portion 329 and face it radially Dd, or it may be in contact with a part of the ninth insulator portion 329 radially Dd. Alternatively, the radially inner end of the first heat dissipation member 331 may be bent circumferentially outward, as in Figure 4B, and overlap with at least the circumferentially inner portion of the third insulator portion 323 in the radial direction Dd, thereby covering this portion.

[0106] Furthermore, in Figure 6C, the radially outer end of the second heat dissipation member 332 is in contact with the fifth insulator portion 325. However, the example in Figure 6C does not exclude a configuration in which the radially outer end of the second heat dissipation member 332 is not in contact with the fifth insulator portion 325. For example, the radially outer end of the second heat dissipation member 332 may be separated radially inward Di from the fifth insulator portion 325, similar to Figure 5A. In this case, the radially outer end of the second heat dissipation member 332 may have a gap with the fifth insulator portion 325 and face it radially in the direction Dd. Alternatively, the radially outer end of the second heat dissipation member 332 may have a gap with a part of the tenth insulator portion 3210 and face it radially in the direction Dd, or it may be in contact with a part of the tenth insulator portion 3210 radially in the direction Dd. Alternatively, the radially outer end of the second heat dissipation member 332 may be bent circumferentially outward, as in Figure 5B, and overlap with at least the circumferentially inner portion of the fifth insulator portion 325 in the radial direction Dd, thereby covering this portion.

[0107] Furthermore, in Figure 6C, the radially inner end of the second heat dissipation member 332 is in contact with the seventh insulator portion 327. However, the example in Figure 6C does not exclude a configuration in which the radially inner end of the second heat dissipation member 332 is not in contact with the seventh insulator portion 327. For example, the radially inner end of the second heat dissipation member 332 may be separated from the seventh insulator portion 327 radially outward Do, as in Figure 5A. In this case, the radially inner end of the second heat dissipation member 332 may have a gap with the seventh insulator portion 327 and face it radially Dd. Alternatively, the radially inner end of the second heat dissipation member 332 may have a gap with a part of the tenth insulator portion 3210 and face it radially Dd, or it may be in contact with a part of the tenth insulator portion 3210 radially Dd. Alternatively, the radially inner end of the second heat dissipation member 332 may be bent circumferentially outward, as in Figure 5B, and overlap with at least the circumferentially inner portion of the seventh insulator portion 327 in the radial direction Dd, thereby covering this portion.

[0108] Furthermore, in this embodiment, at the end face of the teeth portion 312 in a first direction perpendicular to the radial direction Dd, the heat dissipation member 33 is positioned inward (i.e., towards the central part) from the ends of the teeth portion 312 in the radial direction Dd and in a second direction perpendicular to the first direction. In the first direction, the heat dissipation member 33 protrudes outward from the insulator 32 in the first direction. More specifically, the end of the heat dissipation member 33 on the outward side in the first direction is located outward from at least one of the portions of the insulator 32 that are on one side of the second direction and the other side of the second direction relative to the heat dissipation member 33.

[0109] For example, on the circumferential outer end face of the teeth portion 312, the heat dissipation member 33 (i.e., the first heat dissipation member 331) is positioned axially inward from the axial outer end of the teeth portion 312. In this case, the first direction mentioned above is the circumferential direction Dr. The second direction mentioned above is the axial direction Da. Furthermore, on the circumferential outer end face of the teeth portion 312, a portion of the insulator 32 is positioned axially outward from the heat dissipation member 33.

[0110] As shown in Figures 3A, 6A, and 7, in the circumferential direction Dr, the circumferential outer end of the heat dissipation member 33 is located circumferentially outward from the circumferential outer end of the portion of the insulator 32 that is axially outward from the heat dissipation member 33. In other words, on at least one circumferential side of the teeth portion 312, the first heat dissipation member 331 protrudes circumferentially outward from the insulator 32. In this embodiment, on one circumferential side of the teeth portion 312, the first heat dissipation member 331 protrudes circumferentially in one direction from at least one of the portion of the insulator 32 that is axially on one side Da1 and the other side Da2 of the axial direction relative to the heat dissipation member 33. The same applies to the other circumferential side of the teeth portion 312.

[0111] In this way, even if the insulator 32 is placed on the circumferential outer end face of the tooth portion 312, the conductor 341 of the coil portion 34 can be embedded in the heat dissipation member 33 (first heat dissipation member 331). Therefore, the contact area between the coil portion 34 and the heat dissipation member 33 can be reliably increased.

[0112] Similarly, on the axial outer end face of the teeth portion 312, the heat dissipation member 33 (i.e., the second heat dissipation member 332) is positioned circumferentially inward from the circumferential outer end of the teeth portion 312. In this case, the first direction mentioned above is the axial direction Da. The second direction mentioned above is the circumferential direction Dr. Furthermore, on the axial outer end face of the teeth portion 312, a portion of the insulator 32 is positioned circumferentially outward from the heat dissipation member 33.

[0113] As shown in Figures 3A, 6A, and 7, in the axial direction Da, the axial outer end of the heat dissipation member 33 is located axially outward from the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33. In other words, in at least one of the axial directions Da1 and Da2, the second heat dissipation member 332 protrudes axially outward from the insulator 32. In this embodiment, on the axial direction Da1 side of the teeth portion 312, the second heat dissipation member 332 protrudes axially in Da1 from at least one of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33. The same applies to the axial direction Da2 side of the teeth portion 312.

[0114] In this way, even if the insulator 32 is placed on the axial outer end face of the teeth portion 312, the conductor 341 of the coil portion 34 can be embedded in the heat dissipation member 33 (second heat dissipation member 332). Therefore, the contact area between the coil portion 34 and the heat dissipation member 33 can be reliably increased.

[0115] Next, in Figures 3A and 6A, at the end face of the teeth portion 312 in the first direction, the end face of the heat dissipation member 33 on the second direction outward side faces the second direction with a gap between it and the second direction inward end of the portion of the insulator 32 that is on the second direction outward side of the heat dissipation member 33. As mentioned above, the first direction is perpendicular to the radial direction Dd. The second direction is perpendicular to both the radial direction Dd and the first direction.

[0116] For example, at the circumferential outer end face of the teeth portion 312, the axial outer end of the heat dissipation member 33 (first heat dissipation member 331) faces the axial direction Da with a gap S1 between it and the axial inner end of the portion of the insulator 32 that is axially outward from the heat dissipation member 33 (first heat dissipation member 331). In other words, at least at one circumferential end face of the teeth portion 312, the axial end of the heat dissipation member 33 (first heat dissipation member 331) may face the axial direction Da with a gap S1 between it and the axial other end of the portion of the insulator 32 that is axially one Da1 side of the heat dissipation member 33. And / or, the axial other end of the heat dissipation member 33 (first heat dissipation member 331) may face the axial direction Da with a gap S1 between it and the axial one end of the portion of the insulator 32 that is axially one Da2 side of the heat dissipation member 33. In this case, the first direction mentioned above is the circumferential direction Dr. The second direction mentioned above is the axial direction Da. This way, even if the insulator 32 is placed on the teeth portion 312, the heat dissipation member 33 (first heat dissipation member 331) can be easily placed on the circumferential outer end face of the teeth portion 312.

[0117] Similarly, at the axial outer end face of the teeth portion 312, the axial outer end of the heat dissipation member 33 (second heat dissipation member 332) faces the circumferential Dr with a gap S2 between it and the circumferential inner end of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33 (second heat dissipation member 332). In other words, at least one of the axial end face and the other axial end face of the teeth portion 312, the circumferential end of the heat dissipation member 33 (second heat dissipation member 332) faces the circumferential Dr with a gap S2 between it and the circumferential end of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33. And / or, the circumferential end of the heat dissipation member 33 (second heat dissipation member 332) faces the circumferential Dr with a gap S2 between it and the circumferential end of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33. In this case, the first direction described above is the axial Da. The second direction mentioned above is the circumferential direction Dr. This allows the heat dissipation member 33 (second heat dissipation member 332) to be easily positioned on the axial outer end face of the teeth portion 312, even if the insulator 32 is positioned on the teeth portion 312.

[0118] Alternatively, at the end face of the teeth portion 312 in a first direction perpendicular to the radial direction Dd, at least one of the gaps S1 and S2 may be omitted. In other words, as shown in Figure 7, at the end face of the teeth portion 312 in a first direction, the end face of the heat dissipation member 33 on the second direction outward side may be in contact in the second direction with the second direction inward end of the portion of the insulator 32 that is on the second direction outward side of the heat dissipation member 33. As mentioned above, the first direction is the direction perpendicular to the radial direction Dd. The second direction is the direction perpendicular to both the radial direction Dd and the first direction.

[0119] For example, at the circumferential outer end face of the teeth portion 312, the axial outer end of the heat dissipation member 33 (first heat dissipation member 331) contacts the axial inner end of the portion of the insulator 32 that is axially outward from the heat dissipation member 33 in axial direction Da. In other words, at least at one circumferential end face of the teeth portion 312, the axial end of the heat dissipation member 33 (first heat dissipation member 331) may contact the axial other end of the portion of the insulator 32 that is axially one Da1 side of the heat dissipation member 33 in axial direction Da. And / or, the axial other end of the heat dissipation member 33 (first heat dissipation member 331) may contact the axial end of the portion of the insulator 32 that is axially one Da2 side of the heat dissipation member 33 in axial direction Da. In this case, the first direction described above is the circumferential direction Dr. The second direction described above is the axial direction Da. In this way, a heat conduction path with an axial length Da is formed between the coil portion 34 and the tooth portion 312 at the circumferential outer end surface of the tooth portion 312, thereby preventing an increase in the heat conduction resistance between the two.

[0120] Similarly, at the axial outer end face of the teeth portion 312, the circumferential outer end of the heat dissipation member 33 (second heat dissipation member 332) contacts the circumferential inner end of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33 in the circumferential direction Dr. That is, at least one of the axial end face and the other axial end of the teeth portion 312, the circumferential end of the heat dissipation member 33 (second heat dissipation member 332) may contact the circumferential other end of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33 in the circumferential direction Dr. and / or, the circumferential other end of the heat dissipation member 33 (second heat dissipation member 332) may contact the circumferential end of the portion of the insulator 32 that is circumferentially outward from the heat dissipation member 33 in the circumferential direction Dr. In this case, the first direction described above is the axial direction Da. The second direction described above is the circumferential direction Dr. In this way, a circumferential heat conduction path Dr is formed between the coil portion 34 and the tooth portion 312 at the axial outer end face of the tooth portion 312, thereby preventing an increase in the heat conduction resistance between them.

[0121] In Figure 7, as in Figure 3A, the heat dissipation member 33 is positioned on the surface of the teeth portion 312. However, even if not illustrated in this example, the heat dissipation member 33 may be positioned on the surface of the insulator 32 in Figure 7, as in Figure 6A.

[0122] Furthermore, in Figures 2 to 7, the axial outer end of the first heat dissipation member 331 is positioned axially inward from the axial outer end of the circumferential outer end face of the teeth portion 312. However, the axial outer end of the first heat dissipation member 331 may reach the axial outer end of the teeth portion 312.

[0123] Furthermore, as shown in Figure 8, the axial outer end of the first heat dissipation member 331 may be positioned axially outward from the axial outer end of the teeth portion 312, and may overlap with the insulator 32 positioned at the axial outer end of the teeth portion 312 in contact with it in the circumferential direction Dr.

[0124] For example, in at least one of the first heat dissipation members 331 on one circumferential side and the other side, one axial end of the first heat dissipation member 331 may be positioned axially Da1 further than the axial end of the teeth portion 312, and may overlap with the insulator 32 (for example, the insulator portion 3211 in Figure 8) positioned at the axial end of the teeth portion 312 in contact with it in the circumferential Dr. And / or, the other axial end of the first heat dissipation member 331 may be positioned axially Da2 further than the other axial end of the teeth portion 312, and may overlap with the insulator 32 (for example, the insulator portion 3212 in Figure 8) positioned at the other axial end of the teeth portion 312 in contact with it in the circumferential Dr.

[0125] This ensures more reliable electrical insulation between the coil portion 34, around which the conductor 341 is wound, and the teeth portion 312 of the first heat dissipation member 331.

[0126] Furthermore, in Figures 2 to 7, the axial outer end of the second heat dissipation member 332 is positioned circumferentially inward from the circumferential outer end of the axial outer end face of the teeth portion 312. However, the circumferential outer end of the second heat dissipation member 332 may reach the circumferential outer end of the teeth portion 312.

[0127] Furthermore, as shown in Figure 9, the circumferential outer end of the second heat dissipation member 332 may be positioned circumferentially outward from the circumferential outer end of the teeth portion 312, and may overlap with the insulator 32 positioned at the axial outer end of the teeth portion 312 in contact with the axial Da.

[0128] For example, in at least one of the second heat dissipation members 332 on the axial side Da1 and the other Da2, one circumferential end of the second heat dissipation member 332 may be positioned circumferentially to one side of the circumferential end of the teeth portion 312 and may overlap with an insulator 32 (for example, the insulator portion 3213 in Figure 9) positioned at one circumferential end of the teeth portion 312 in contact with the axial Da. And / or, the other circumferential end of the second heat dissipation member 332 may be positioned circumferentially to the other side of the circumferential end of the teeth portion 312 and may overlap with an insulator 32 (for example, the insulator portion 3214 in Figure 9) positioned at the other circumferential end of the teeth portion 312 in contact with the axial Da.

[0129] This ensures more reliable electrical insulation between the coil portion 34, around which the conductor 341 is wound, and the teeth portion 312 of the second heat dissipation member 332.

[0130] <2-2. Materials for heat dissipation component 33> Next, the material of the heat dissipation member 33 can be any material with a higher thermal conductivity than air, for example, a material other than an insulating material can be used. Preferably, the heat dissipation member 33 is made of a heat-conducting material with high thermal conductivity.

[0131] More preferably, the heat dissipation member 33 has electrical insulating properties. For example, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 can be made of a material containing an organic compound such as a silicone-based, urethane-based, or acrylic-based material. This makes it possible to more reliably prevent short circuits between the coil portion 34 and the housing 4 via the heat dissipation member 33. This effect is particularly effective in configurations where the heat dissipation member 33 is directly positioned on the surface of the teeth portion 312 (see Figures 3A to 5C and Figures 7 to 9).

[0132] However, this example does not exclude configurations in which at least one of the first heat dissipation member 331 and the second heat dissipation member 332 has low electrical insulation properties. For example, a short circuit between the coil section 34 and the housing 4 can be suppressed by insulating the conductor 341. Therefore, it is possible to use an electrically conductive material for the heat dissipation member 33. Accordingly, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 can be made of a material including, for example, graphite or carbon fiber.

[0133] Furthermore, as mentioned above, the heat dissipation member 33 is deformable. Preferably, the heat dissipation member 33 includes an elastic member. More specifically, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 includes an elastic member. For the elastic member, a material that is easily elastically deformable, such as rubber or elastic resin, can be used. In this way, when the coil portion 34 is positioned, the conductor 341 can easily and closely fit into the heat dissipation member 33.

[0134] More preferably, the elastic member described above is in sheet form. More specifically, the elastic member included in at least one of the first heat dissipation member 331 and the second heat dissipation member 332 is in sheet form. For this elastic member, a heat dissipation sheet made of a heat conductive material such as silicone, urethane, or acrylic can be used. This allows the heat dissipation member 33 to be arranged compactly, thereby suppressing or preventing a reduction in the space available for winding the conductor 341 in the slots of the stator core 31. This prevents a reduction in the number of turns of the conductor 341 in the coil section 34.

[0135] However, the above examples do not exclude configurations in which the elastic member is not in sheet form, or configurations in which the heat dissipation member 33 does not include an elastic member. For example, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 may be made of a material that is more easily deformed plastically than elastically, or may include a material that is more easily deformed plastically.

[0136] Preferably, the heat dissipation member 33 contains thermal grease. More specifically, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 contains thermal grease. In the thermal grease, for example, a material having high thermal conductivity is dispersed in a highly viscous lubricating oil or the like. In this case, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 may contain both the elastic member and the thermal grease as described above. Alternatively, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 may contain thermal grease but not the elastic member as described above. In other words, at least one of the first heat dissipation member 331 and the second heat dissipation member 332 may be filled with thermal grease as the heat dissipation member 33. In this way, when arranging the coil section 34, the wire 341 is wound around it via a sufficient amount of thermal grease placed on the surface of the teeth section 312 or the insulator 32, causing the wire 341 to sink into the thermal grease and filling the gap between the wire 341 and the surface. Alternatively, by using thermal grease in combination with the elastic member described above, the gap at the contact point between the surface of the teeth section 312 or the insulator 32 and the elastic member can be filled with thermal grease, allowing for closer contact between the two. Furthermore, the gap at the contact point between the wire 341 of the coil section 34 and the elastic member can be filled with thermal grease, allowing for closer contact between the two. Therefore, the heat dissipation performance of the coil section 34 can be improved. However, this example does not exclude a configuration in which both the first heat dissipation member 331 and the second heat dissipation member 332 do not contain thermal grease.

[0137] <3. Electric Vehicles 100> In this embodiment, the motor 1 is mounted on an electric vehicle 100. Figure 10 is a schematic diagram of the electric vehicle 100 on which the motor 1 is mounted. The electric vehicle 100 in Figure 10 is a motorcycle. However, the examples in this embodiment do not exclude configurations in which the motor 1 is mounted on an electric vehicle 100 other than a motorcycle.

[0138] As shown in Figure 10, the electric vehicle 100 is equipped with a motor 1. In the electric vehicle 100 of this embodiment, the heat dissipation of the coil portion 34 of the motor 1 can be improved with a simple configuration.

[0139] The electric vehicle 100 also comprises a body 101, a battery 102, and wheels 103.

[0140] The vehicle body 101 includes a steering wheel 1011 and a seat 1012 in which the passenger sits.

[0141] The battery 102 is attached to the vehicle body 101. The battery 102 is a rechargeable power supply device such as a lithium-ion battery, and supplies power to components of the electric vehicle 100, such as the motor 1.

[0142] The wheels 103 have a front wheel 103f and a rear wheel 103r. The front wheel 103f is attached to the front of the vehicle body 101, and the rear wheel 103r is attached to the rear of the vehicle body 101. The torque of the motor 1 is transmitted to the rear wheel 103r via a power transmission mechanism (not shown). The electric vehicle 100 can move as the rear wheel 103r rotates in response to this torque.

[0143] <4. Others> Embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the embodiments described above. The present invention can be implemented by making various modifications to the embodiments described above without departing from the spirit of the invention. Furthermore, the matters described in the embodiments described above can be combined as appropriate and arbitrarily as long as they do not create contradictions.

[0144] For example, in the above-described embodiment, the motor 1 is mounted on the electric vehicle 100. However, the motor 1 may be provided in a device other than the electric vehicle 100, although the invention is not limited to this example. [Industrial applicability]

[0145] The present invention is useful, for example, in a rotating machine in which a coil section is arranged on a stator core. [Explanation of Symbols]

[0146] 1...Motor, 10...Shaft, 2...Rotor, 21...Rotor core, 22...Magnet, 23...Balance weight, 3...Stator, 31...Stator core, 310...Core piece, 311...Core back section, 312...Teeth section, 313...Umbrella section, 32...Insulator, 320...Groove section, 321...First insulator section, 32 2...Second insulator section, 323...Third insulator section, 324...Fourth insulator section, 325...Fifth insulator section, 326...Sixth insulator section, 327...Seventh insulator section, 328...Eighth insulator section, 329...Ninth insulator section, 3210...Tenth insulator section, 3211, 3212, 3213, 3214... ...Insulator section, 33...Heat dissipation member, 331...First heat dissipation member, 332...Second heat dissipation member, 34...Coil section, 341...Conducting wire, 4...Housing, 41...Cylinder section, 42...Lid section, 43...Bracket, 44...First bearing holder, 441...First bearing, 45...Second bearing holder, 451...Second bearing, 5...Circuit board, 100 ...Electric vehicle, 101...body, 1011...handle, 1012...seat, 102...wheel, 102f...front wheel, 102r...rear wheel, 103...battery, CA...central axis, Da...axial direction, Da1...one axial direction, Da2...other axial direction, Dd...radial direction, Do...radial outward, Di...radial inward, Dr...circumferential direction, S1, S2...gap

Claims

1. A rotor that can rotate around a central axis extending in the axial direction, A stator having a stator core radially opposite to the rotor, It has, The stator core is, The core back portion surrounding the central axis, The teeth portion extends radially from the core back portion, It has, The stator is, A deformable heat dissipation member positioned on the outer side of the teeth portion in a direction perpendicular to the radial direction, A coil section having a conductor arranged in the teeth section via the heat dissipation member, An insulator is positioned on a part of the side surface of the teeth portion in the radial and perpendicular directions, It further possesses, The aforementioned insulator is A first insulator portion extending axially outward from the axial outer end face of the core back portion, A second insulator portion extends from the axial inner end of the first insulator portion and is positioned at the end of the axial outer end face of the teeth portion on the core back portion side in the radial direction, It has, In a motor, the heat dissipation member overlaps the second insulator portion in the axial direction at the end of the axial outer end face of the tooth portion on the core back portion side in the radial direction.

2. A rotor that is rotatable about a central axis extending in the axial direction, A stator having a stator core radially opposite to the rotor, It has, The stator core is, The core back portion surrounding the central axis, The teeth portion extends radially from the core back portion, It has, The stator is, A deformable heat dissipation member positioned on the outer side of the teeth portion in a direction perpendicular to the radial direction, A coil section having a conductor arranged in the teeth section via the heat dissipation member, An insulator is positioned on a part of the side surface of the teeth portion in the radial and perpendicular directions, It further possesses, The heat dissipation member has a first heat dissipation member arranged on the circumferentially outward side of the teeth portion, A motor in which the axial outer end of the first heat dissipation member is positioned axially outward from the axial outer end of the teeth portion and overlaps with the insulator positioned at the axial outer end of the teeth portion in a circumferential manner.

3. A rotor that is rotatable about a central axis extending in the axial direction, A stator having a stator core radially opposite to the rotor, It has, The stator core is, The core back portion surrounding the central axis, The teeth portion extends radially from the core back portion, It has, The stator is, A deformable heat dissipation member positioned on the outer side of the teeth portion in a direction perpendicular to the radial direction, A coil section having a conductor arranged in the teeth section via the heat dissipation member, An insulator is positioned on a part of the side surface of the teeth portion in the radial and perpendicular directions, It further possesses, The heat dissipation member has a second heat dissipation member arranged on the axially outward side of the teeth portion, A motor in which the circumferential outer end of the second heat dissipation member is positioned circumferentially outward from the circumferential outer end of the teeth portion and overlaps in circumferential contact with the insulator positioned at the circumferential outer end of the teeth portion.

4. On the circumferential outer end surface of the teeth portion, the heat dissipation member is positioned axially inward from the axial outer end of the teeth portion. The motor according to claim 1 or claim 3, wherein, in the circumferential direction, the outer circumferential end of the heat dissipation member is located circumferentially outward from the outer circumferential end of the portion of the insulator that is axially outward from the heat dissipation member.

5. The motor according to claim 4, wherein, on the circumferential outer end surface of the teeth portion, the axial outer end of the heat dissipation member faces the axial inner end of the portion of the insulator that is axially outward from the heat dissipation member, with a gap between them.

6. The motor according to claim 5, wherein, at the circumferential outer end surface of the teeth portion, the axial outer end of the heat dissipation member is in axial contact with the axial inner end of the portion of the insulator that is axially outward from the heat dissipation member.

7. The motor according to any one of claims 1 to 6, wherein the heat dissipation member is arranged at least on the circumferentially outward side of the teeth portion.

8. The motor according to claim 7, wherein the heat dissipation member is further arranged on the axially outward side of the teeth portion.

9. The motor according to claim 7 or claim 8, wherein the heat dissipation member is in contact with the surface of the teeth portion.

10. The motor according to claim 9, wherein the heat dissipation member is arranged on another part of the side surface of the teeth portion in a direction perpendicular to the radial direction.

11. The aforementioned insulator is A third insulator portion is positioned on the end face of the core back portion on the coil portion side in the radial direction, A fourth insulator portion extends from the circumferential inner end of the third insulator portion and is positioned at the end of the circumferential outer end face of the teeth portion on the core back portion side in the radial direction, It has, The motor according to claim 10, wherein at the end of the circumferential outer end face of the teeth portion on the core back portion side in the radial direction, the heat dissipation member overlaps with the fourth insulator portion in the circumferential direction.

12. The stator core further has an umbrella portion that extends circumferentially outward from the end of the teeth portion opposite to the core back portion in the radial direction, The aforementioned insulator is A fifth insulator portion is positioned on the end face of the coil portion in the radial direction of the umbrella portion, A sixth insulator portion extends from the circumferential inner end of the fifth insulator portion and is positioned at the end of the circumferential outer end face of the teeth portion that is opposite to the core back portion in the radial direction, It has, The motor according to claim 10 or claim 11, wherein at the end of the circumferential outer end face of the teeth portion opposite to the core back portion in the radial direction, the heat dissipation member overlaps the sixth insulator portion in the circumferential direction.

13. The aforementioned insulator is A seventh insulator portion extending axially outward from the end of the tooth portion opposite to the core back portion in the radial direction, An eighth insulator portion extends from the axial inner end of the seventh insulator portion and is positioned at the end of the axial outer end face of the teeth portion opposite to the core back portion in the radial direction, It has, The motor according to any one of claims 10 to 12, wherein at the end of the axial outer end face of the teeth portion opposite to the core back portion in the radial direction, the heat dissipation member overlaps the eighth insulator portion in the axial direction.

14. The motor according to claim 7 or claim 8, wherein the heat dissipation member is disposed on the insulator.

15. The motor according to any one of claims 1 to 14, wherein the heat dissipation member has electrical insulating properties.

16. The motor according to any one of claims 1 to 15, wherein the heat dissipation member includes an elastic member.

17. The motor according to claim 16, wherein the elastic member is in the shape of a sheet.

18. The motor according to any one of claims 1 to 17, wherein the heat dissipation member includes heat dissipation grease.

19. An electric vehicle comprising the motor described in any one of claims 1 to 18.

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