Stator and motor

Abstract

A configuration is provided in a stator in which a coil is wound around a tooth portion via an insulator member, which can improve the durability of the coil and can suppress radial movement of the coil relative to the tooth portion. [Solution] An insulator member (24) has tooth cover portions (242) arranged on the axial end faces of a plurality of teeth (212), and a pair of protrusions (243) protruding in the axial direction from one circumferential end and the other circumferential end of the tooth cover portions, respectively. A coil is in contact with an outer surface (243b) opposite to the mutually opposing inner surfaces (243a) of the pair of protrusions.

Description

[Technical Field]

[0001] The present invention relates to a stator and a motor. [Background technology]

[0002] There is known a motor in which the axial end face of a stator core is covered with a resin insulator member. A coil is wound around the teeth of the stator core via the insulator member. The insulator member insulates the coil from the axial end face of the stator core (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Chinese Utility Model No. 216981641 Summary of the Invention [Problem to be solved by the invention]

[0004] The coils wound around the teeth are bent with tension near the corners of the teeth to prevent radial movement. By bending the coil in this way, the outside of the bent portion of the coil is pulled and the inside is compressed. Therefore, if too much tension is applied to the coil, there is a risk that the insulating coating covering the conductor that makes up the coil will tear at the bent portion.

[0005] The object of the present invention is to provide a configuration in a stator in which a coil is wound around a tooth portion via an insulator member, which can improve the durability of the coil and suppress radial movement of the coil relative to the tooth portion. [Means for solving the problem]

[0006] A stator according to an exemplary embodiment of the present invention includes a stator core having a cylindrical core back portion extending in the axial direction and a plurality of teeth extending radially from the core back portion and arranged circumferentially, with a plurality of slots arranged circumferentially between adjacent teeth among the plurality of teeth, an insulator member covering an axial end face of the stator core, and a coil wound around each of the plurality of teeth via the insulator member. The insulator member has tooth cover portions respectively disposed on the axial end faces of the plurality of teeth, and a pair of protrusions protruding in the axial direction from one end and the other end of the tooth cover portion, respectively. The coil is in contact with outer surfaces opposite to the opposing inner surfaces of the pair of protrusions.

[0007] A motor according to an exemplary embodiment of the present invention includes the stator and a rotor having a magnet radially opposed to the stator. [Effects of the Invention]

[0008] According to the present invention, in a stator in which a coil is wound around a tooth portion via an insulator member, it is possible to provide a configuration that can improve the durability of the coil and suppress radial movement of the coil relative to the tooth portion. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a motor according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of the stator. [Figure 3] FIG. 3 is a plan view of the stator core. [Figure 4] FIG. 4 is an enlarged perspective view of a portion of the stator. [Figure 5] FIG. 5 is a perspective view showing a schematic configuration of an insulator member. [Figure 6]FIG. 6 is a cross-sectional view of the insulator member and the teeth taken along the circumferential direction. [Figure 7] FIG. 7 is a diagram showing a schematic view of how a conducting wire is wound around a tooth portion. [Figure 8] FIG. 8 is a diagram showing a schematic view of how a conducting wire is wound around a tooth portion. [Figure 9] FIG. 9 is a cross-sectional view of the teeth around which the conductive wire is wound, cut in the radial direction. [Figure 10] FIG. 10 is a cross-sectional view of an insulator member and teeth according to a modified example, cut in the circumferential direction. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and their description will not be repeated. Furthermore, the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of the components.

[0011] In the following description, the direction parallel to the central axis P of the motor 1 will be referred to as the axial direction, the direction perpendicular to the central axis P as the radial direction, and the direction along the arc centered on the central axis P as the circumferential direction. However, these definitions of directions are not intended to limit the orientation of the motor 1 according to the present invention when in use. In each drawing, the axial direction is indicated by A, the radial direction is indicated by B, and the circumferential direction is indicated by C. Within the radial direction B, the direction in which the teeth 212 are located relative to the core back portion 211 is indicated by B1, and the direction in which the core back portion 211 is located relative to the teeth 212 is indicated by B2.

[0012] Furthermore, in the following description, the expressions "fix," "connect," and "attach" (hereinafter referred to as "fixing") include not only cases where members are directly fixed to each other, but also cases where members are fixed via other members. In other words, in the following description, the expression "fixing" includes both direct and indirect fixing of members to each other.

[0013] (Motor configuration) A motor 1 according to an exemplary embodiment of the present invention will be described with reference to Figure 1. Figure 1 is a cross-sectional view showing a schematic configuration of motor 1. Motor 1 according to this embodiment is, for example, an in-wheel motor that is disposed on the rear wheel of an electric motorcycle. However, the motor may also be disposed on the front wheel of an electric motorcycle.

[0014] 1, the motor 1 includes a stator 2 and a rotor 3. The motor 1 further includes a shaft 4, a stator holder 5, and bearings 6.

[0015] The shaft 4 is columnar and extends in an axial direction A about a central axis P. The shaft 4 is attached to the main body of the electric motorcycle so as to be non-rotatable.

[0016] The stator holder 5 is disk-shaped and centered on a central axis P. The stator holder 5 has a through-hole 51 at its center that penetrates in an axial direction A. The shaft 4 is inserted into the through-hole 51 and protrudes from both axial ends of the through-hole 51. For example, the shaft 4 is directly press-fitted into the through-hole 51, or a sleeve part is attached to the through-hole 51 and press-fitted indirectly, thereby fixing the stator holder 5 to the shaft 4.

[0017] The stator 2 is an armature of the motor 1. The stator 2 is cylindrical and extends in the axial direction A. The stator 2 is located radially outward of the stator holder 5. The stator 2 is fixed to the stator holder 5. In other words, the stator 2 is fixed so as not to rotate relative to the shaft 4. Details of the stator 2 will be described later.

[0018] The rotor 3 has a magnet 31, a yoke 32, a rim 33, a first wheel cover 34, and a second wheel cover 35. The magnet 31 of the rotor 3 faces the stator 2 in the radial direction B. In this embodiment, the magnet 31 is positioned radially outward of the stator 2 with a gap therebetween. A plurality of magnets 31 are arranged at equal intervals in the circumferential direction. Note that the number of magnets does not need to be multiple, and a single annular magnet may be used.

[0019] The yoke 32 has a cylindrical shape that extends in the axial direction A around a central axis P. The magnet 31 is fixed to the inner circumferential surface of the yoke 32.

[0020] The rim 33 is annular and centered on the central axis P. The rim 33 is located radially outward of the yoke 32. The rim 33 is fixed to the yoke 32. A rear wheel tire is attached radially outward of the rim 33.

[0021] The first wheel cover 34 is located on one axial side and radially inward of the yoke 32. The first wheel cover 34 is rotatably attached to the shaft 4 via a bearing 6 such as a ball bearing. The outer periphery of the first wheel cover 34 is fixed to the yoke 32 with screws or the like. Therefore, the first wheel cover 34 rotates around the central axis P together with the yoke 32 and the rim 33.

[0022] The second wheel cover 35 is located on the other axial side and radially inward of the yoke 32. The second wheel cover 35 is rotatably attached to the shaft 4 via a bearing 6 such as a ball bearing. The outer periphery of the second wheel cover 35 is fixed to the yoke 32. Therefore, the second wheel cover 35 rotates around the central axis P together with the yoke 32, the rim 33, and the first wheel cover 34.

[0023] The second wheel cover 35 has a brake drum 35a that protrudes in the axial direction. The brake drum 35a is integral with the second wheel cover. For example, a brake mechanism on the electric motorcycle body is disposed on the inner periphery of the brake drum 35a.

[0024] The rotor 3 rotates about the central axis P due to a circumferential torque generated when a driving current is supplied to the stator 2.

[0025] (Details of the stator) A stator 2 according to this embodiment will be described with reference to Fig. 1 to Fig. 4. Fig. 2 is a perspective view showing a schematic configuration of the stator 2. Fig. 3 is a plan view of the stator core 21. Fig. 4 is an enlarged perspective view showing a part of the stator 2 before the coil 22 is wound thereon. In addition to the stator 2, Fig. 2 also shows a stator holder 5.

[0026] As shown in FIG. 2, the stator 2 includes a stator core 21, a coil 22, an insulator member 24, and an insulating sheet 25.

[0027] 1, the stator core 21 is disposed radially inward of the magnet 31 with a gap therebetween. The stator core 21 is made of a magnetic material. In this embodiment, the stator core 21 is formed by laminating electromagnetic steel sheets.

[0028] 3, the stator core 21 has a core back portion 211 and a plurality of teeth 212. The core back portion 211 has a cylindrical shape extending in the axial direction A. The teeth 212 extend from the core back portion 211 in the radial direction B. In this embodiment, the teeth 212 extend radially outward from the core back portion 211.

[0029] The plurality of teeth 212 are aligned in the circumferential direction C. A slot 213 is formed between each of the plurality of teeth 212 that are adjacent to each other in the circumferential direction C. The plurality of slots 213 are aligned in the circumferential direction C.

[0030] 2, the coil 22 is wound around the tooth portion 212. More specifically, the coil 22 is formed by winding a conductive wire 22a coated with an insulator around the tooth portion 212.

[0031] When a driving current is supplied to the coil 22, a radial magnetic flux is generated in the teeth 212. This generates a circumferential torque in the rotor 3 having the magnet 31, causing the rotor 3 to rotate about the central axis P.

[0032] The coil 22 is wound around each of the teeth 212 via an insulator member 24 and an insulating sheet 25. The insulator member 24 and the insulating sheet 25 are insulators. In this embodiment, the insulator member 24 and the insulating sheet 25 are made of resin.

[0033] 4, the insulator members 24 are disposed on one axial end face and the other axial end face of the stator core 21. That is, the insulator members 24 cover at least a portion of the end face in the axial direction A of the stator core 21. In this embodiment, the insulator member 24 disposed on the one axial end face of the stator core 21 and the insulator member 24 disposed on the other axial end face have the same configuration. Details of the insulator members 24 will be described later.

[0034] 4, the insulating sheets 25 are disposed inside the slots 213. The insulating sheets 25 are disposed one by one on the inner circumferential surfaces of the plurality of slots 213. The insulating sheets 25 have a shape that fits along the inner circumferential surfaces of the slots 213.

[0035] Specifically, the insulating sheet 25 has a pair of tooth contact portions 251 extending in the radial direction B and a core back contact portion 252 extending in the circumferential direction. The pair of tooth contact portions 251 contact a pair of opposing side surfaces of circumferentially adjacent tooth portions 212. The core back contact portion 252 contacts a portion of the outer peripheral surface of the core back portion 211 that is located between the pair of side surfaces. When viewed in the axial direction A, the insulating sheet 25 has bent portions 253 between the core back contact portion 252 and each of the pair of tooth contact portions 251.

[0036] The insulating sheet 25 has a sheet end portion 25a that protrudes from the slot 213 in the axial direction A. In this embodiment, the length of the sheet end portion 25a in the axial direction A is smaller than the length of the insulator member 24 in the axial direction A. Therefore, the sheet end portion 25a covers at least a portion of the end face of the insulator member 24 in the circumferential direction C.

[0037] 2, the coils 22 are wound around the teeth 212 via insulator members 24 and insulating sheets 25. That is, the insulator members 24 are located between the teeth 212 and the coils 22 in the axial direction A. The insulating sheets 25 are located between the teeth 212 and the coils 22 in the circumferential direction C. The insulator members 24 and the insulating sheets 25 insulate the stator core 21 from the coils 22.

[0038] When an outward expanding force is applied to insulating sheet 25, bent portion 253 may break. That is, sheet end portion 25a may break when it is pushed by coil 22 wound around tooth portion 212 and expanded outward.

[0039] In this embodiment, the insulator member 24 is located in the circumferential direction C relative to the sheet end portion 25a. Therefore, the sheet end portion 25a does not expand outward even when pressed by the coil 22. This prevents the insulating sheet 25 from breaking.

[0040] (Details of insulator components) Next, the insulator member 24 will be described in detail with reference to Fig. 4 to Fig. 6. Fig. 5 is a perspective view showing a schematic configuration of the insulator member 24. Fig. 6 is a cross-sectional view of the insulator member 24 and the tooth portion 212 cut in the circumferential direction C. As shown in Fig. 5, the insulator member 24 is plate-shaped. The insulator member 24 has an annular core back cover portion 241, a plurality of tooth cover portions 242, and a plurality of protrusions 243.

[0041] The core back cover portion 241 is annular and centered on the central axis P. As shown in FIG. 4 , the core back cover portion 241 is disposed on the end face of the core back portion 211 in the axial direction A. The core back cover portion 241 covers at least a portion of the end face of the core back portion 211 in the axial direction A. The thickness of the core back cover portion 241 is equal to the thickness of the tooth cover portion 242, which will be described later. The core back cover portion 241 insulates the coil 22 from the core back portion 211 of the stator core 21.

[0042] 4, the core back cover part 241 has, on its surface opposite to the surface on the core back part 211 side, a plurality of rib parts 241a that protrude in the axial direction A. The plurality of rib parts 241a improve the rigidity of the core back cover part 241.

[0043] In this embodiment, the multiple rib portions 241a extend in the radial direction B. More specifically, when viewed in the axial direction A, the multiple rib portions 241a each extend in the radial direction B at the same circumferential position as a protruding portion 243 (described later) of the insulator member 24. In this embodiment, the multiple rib portions 241a are each connected to the protruding portion 243 in the radial direction B.

[0044] Each rib portion may extend in the radial direction B at a position different from the circumferential position of the protrusion, or may extend in a direction other than the radial direction B. By aligning the circumferential positions of the rib portion 241a and the protrusion 243 as in this embodiment, the shape of the resin molding die for molding the insulator member 24 can be simplified.

[0045] 5, the plurality of tooth cover portions 242 extend in the direction in which the tooth portions 212 extend from the core back portion 211 in the stator core 21. That is, in this embodiment, the tooth cover portions 242 extend radially outward from the core back cover portion 241.

[0046] 4, the plurality of tooth cover portions 242 are arranged on the end faces of the plurality of tooth portions 212 in the axial direction A. The number of the plurality of tooth cover portions 242 is the same as the number of the plurality of tooth portions 212. The plurality of tooth cover portions 242 each cover at least a portion of the end face of each tooth portion 212 in the axial direction A.

[0047] The plurality of pairs of protrusions 243 protrude in the axial direction A from the plurality of tooth cover portions 242. More specifically, one pair of protrusions 243 protrudes in the axial direction A from one tooth cover portion. In this embodiment, the plurality of tooth cover portions 242 have the same configuration. Furthermore, the pair of protrusions 243 protruding from each tooth cover portion 242 has the same configuration. Therefore, hereinafter, only one pair of protrusions 243 protruding from one tooth cover portion will be described.

[0048] 6, the pair of protrusions 243 protrude in the axial direction A from one end and the other end of the tooth cover portion 242 in the circumferential direction C. The pair of protrusions 243 have inner surfaces 243a facing each other and outer surfaces 243b on the opposite side. The coil 22 is in contact with the outer surfaces 243b of the pair of protrusions 243.

[0049] In this embodiment, the pair of protrusions 243 protrude in the axial direction A from one tip and the other tip of the tooth cover portion 242 in the circumferential direction C, respectively. Here, the tips in the circumferential direction C mean the extreme ends in the circumferential direction C. In other words, there is no step between the outer surfaces 243b of the pair of protrusions 243 and the end faces of the tooth cover portion 242 in the circumferential direction C.

[0050] The pair of protrusions may protrude in the axial direction A from one end and the other end of the tooth cover portion in the circumferential direction C, respectively. Here, the ends in the circumferential direction C refer to a certain range including the tip in the circumferential direction C. In other words, the pair of protrusions may be located at the tip in the circumferential direction C, or may be located closer to the center of the tooth cover portion in the circumferential direction C than the tip when viewed in the radial direction B. There may be a step between the outer surfaces of the pair of protrusions and the end faces in the circumferential direction C of the tooth cover portion.

[0051] In this embodiment, the pair of protrusions 243 are positioned symmetrically with respect to a line of left-right symmetry when viewing the tooth cover portion 242 in the radial direction B. The line of left-right symmetry is a line extending in the axial direction A at the center of the tooth cover portion 242 in the circumferential direction C when viewing the tooth cover portion 242 in the radial direction B. The shape of the pair of protrusions 243 is symmetrical with respect to the line of left-right symmetry.

[0052] In this embodiment, the pair of protruding portions 243 are plate-shaped and inclined in directions approaching each other as they move away from the tooth cover portion 242. The insulator member 24 has a space S between the inner surfaces 243a of the pair of protruding portions 243 and the tooth cover portion 242.

[0053] In this embodiment, the pair of protrusions 243 have traces of plastic deformation at base ends 243c, which are the connection portions with tooth cover portions 242. Specifically, the pair of protrusions 243 have traces of plastic deformation at base ends 243c, where the pair of protrusions 243 have changed from a state in which they extended perpendicular to tooth cover portions 242 to a state in which they are inclined with respect to tooth cover portions 242. That is, the pair of protrusions 243 have plastically deformed portions 244 at base ends 243c.

[0054] Next, a description will be given of the relationship between the pair of protrusions 243 of the insulator member 24 having the above-described configuration and the coil 22. In this embodiment, as shown in Figures 7 and 8, the pair of protrusions 243 are inclined during the process of winding the coil 22 during manufacturing.

[0055] Specifically, in this process, the conductor 22a constituting the coil 22 is wound around the tooth portion 212 while tension is applied to the conductor 22a in the direction of the white arrow in FIG. 8. A force is generated in the conductor 22a, which is tensioned in the direction of the white arrow, toward the winding center. The force of the conductor 22a toward the winding center pushes the pair of protrusions 243 toward the tooth cover portion 242. As a result, the pair of protrusions 243 are tilted. As a result, plastic deformation portions 244 are formed in the base ends 243c of the pair of protrusions 243.

[0056] 6, the coil 22 wound around the tooth portion 212 has a bent portion R between a portion extending in the axial direction A along the side surface of the tooth portion 212 extending in the axial direction A and a portion extending in the circumferential direction C along the end face of the tooth portion 212 in the axial direction A. The bent portion R is formed by bending the conducting wire 22a that constitutes the coil 22 during the process of winding the coil 22.

[0057] In this embodiment, in the process of winding the coil 22, the pair of protrusions 243 are pushed by the coil 22 and tilt. That is, the pair of protrusions 243 reduce the curvature of the bent portion R of the coil 22. Therefore, by winding the coil 22 around the tooth portion 212 via the insulator member 24 configured as described above, it is possible to prevent the coating of the conductive wire 22a from being torn. This improves the durability of the coil 22.

[0058] Furthermore, in the process of winding the coil 22, the conductor 22a comes into contact with the tip 243d of the protrusion 243. That is, in this embodiment, a large surface pressure acts on the tip 243d of the protrusion 243 in the process. This allows the conductor 22a to be wedged into the tip 243d of the protrusion 243, as shown in FIG. 9 . This prevents the conductor 22a from moving in the radial direction B relative to the insulator member 24. This prevents the coil 22 formed by the conductor 22a from coming off the tooth portion 212.

[0059] Therefore, it is possible to provide a stator 2 in which the durability of the coil 22 can be improved and the movement of the coil 22 in the radial direction B relative to the teeth portion 212 is suppressed.

[0060] As described above, the exemplary stator 2 according to this embodiment includes a stator core 21 having a cylindrical core back portion 211 extending in the axial direction A and a plurality of teeth 212 extending from the core back portion 211 in the radial direction B and aligned in the circumferential direction C, with a plurality of slots 213 aligned in the circumferential direction C between adjacent teeth 212 among the plurality of teeth 212, an insulator member 24 covering an end face in the axial direction A of the stator core 21, and coils 22 wound around each of the plurality of teeth 212 via the insulator member 24. The insulator member 24 has tooth cover portions 242 arranged on the end faces in the axial direction A of the plurality of teeth 212, respectively, and a pair of protrusions 243 protruding in the axial direction A from one end and the other end in the circumferential direction C of the tooth cover portion 242, respectively. The coil 22 is in contact with an outer surface 243b opposite to the inner surfaces 243a of the pair of protrusions 243. Here, the end in the circumferential direction C means a certain range including the tip in the circumferential direction C.

[0061] The coil 22 wound around the tooth portion 212 has a bent portion R between a portion extending in the axial direction A along the side surface of the tooth portion 212 extending in the axial direction A and a portion extending in the circumferential direction C along the end face of the tooth portion 212 in the axial direction A. The bent portion R is formed by bending the conducting wire 22a that constitutes the coil 22 during the process of winding the coil 22.

[0062] In the above-described configuration, the coil 22 is in contact with the outer surfaces 243b of the pair of protrusions 243. When tension is applied to the coil 22 during the manufacturing process of winding the coil 22 around the tooth portion 212, the pair of protrusions 243 are pushed toward each other by a force toward the winding center of the coil 22. The outer surfaces 243b of the pair of protrusions 243 can receive the force toward the winding center of the coil 22 at their inclined surfaces. This reduces the curvature of the bent portion R of the coil 22. Therefore, by winding the coil 22 around the tooth portion 212 via the insulator member 24 having the above-described configuration, it is possible to prevent the coating of the conductive wire 22a from being torn. This improves the durability of the coil 22.

[0063] Furthermore, in the process of winding the coil 22, the conductor 22a comes into contact with the tip 243d of the protrusion 243. That is, in the process, a large surface pressure acts on the tip 243d of the protrusion 243. This allows the conductor 22a to be forced into the tip 243d of the protrusion 243. This prevents the conductor 22a from moving in the radial direction B relative to the insulator member 24. This prevents the coil 22 formed by the conductor 22a from coming off the tooth portion 212.

[0064] Therefore, it is possible to provide a stator 2 in which the durability of the coil 22 can be improved and the movement of the coil 22 in the radial direction B relative to the teeth portion 212 is suppressed.

[0065] In this embodiment, the pair of protrusions 243 protrude in the axial direction A from one tip and the other tip of the tooth cover portion 242 in the circumferential direction C, respectively. Here, the tips in the circumferential direction C mean the extreme ends in the circumferential direction C.

[0066] This allows the coil 22 to be bent along the pair of protrusions 243 in the process of winding the coil 22 around the teeth 212 during manufacturing. This makes it possible to more reliably reduce the curvature of the bent portion R of the coil 22.

[0067] The insulator member 24 has a core back cover portion 241 disposed on an end face of the core back portion 211 in the axial direction A. The core back cover portion 241 has a plurality of rib portions 241a protruding from a surface opposite to the surface on the core back portion 211 side.

[0068] This makes it possible to obtain a configuration in which the coil 22 and the core back portion 211 are insulated from each other by the core back cover portion 241 of the insulator member 24. In addition, the rigidity of the core back portion 211 can be improved by the multiple rib portions 241a of the core back portion 211.

[0069] In this embodiment, the pair of protrusions 243 are plate-shaped and inclined in a direction approaching each other as they move away from the tooth cover portion 242. The insulator member 24 has a space S between the inner surfaces 243a of the pair of protrusions 243 and the surface of the tooth cover portion 242 facing the protrusions 243.

[0070] In the above-described configuration, the outer surfaces 243b of the pair of protrusions 243, which are inclined toward each other, are inclined surfaces that incline toward each other toward the tip ends, thereby making it possible to more reliably reduce the curvature of the bent portion R of the coil 22.

[0071] Furthermore, due to the space S between the pair of protrusions 243 and the tooth cover portions 242, the tip portions 243d of the protrusions 243 can be easily pressed toward the tooth cover portions 242 in the process of winding the coil 22. Therefore, in the process of winding the coil 22, the tension applied to the coil 22 can be easily adjusted, and the coil 22 can be more reliably inserted into the tip portions 243d of the pair of protrusions 243. This makes it possible to provide a stator 2 that can improve the durability of the coil 22 and further suppress movement of the coil 22 in the radial direction B relative to the tooth portions 212.

[0072] In this embodiment, the pair of protrusions 243 have plastic deformation portions 244 at the base end portions 243c.

[0073] In this embodiment, the pair of protrusions 243 are inclined due to plastic deformation. That is, when tension is applied to the coil 22 in the process of winding the coil 22, the coil 22 moves the tip ends 243d of the pair of protrusions 243 in a direction approaching the tooth cover portion 242. Therefore, this configuration allows the coil 22 to be more reliably inserted into the tip ends 243d of the pair of protrusions 243. Therefore, it is possible to provide a stator 2 in which movement of the coil 22 in the radial direction B relative to the tooth portion 212 is more suppressed.

[0074] In this embodiment, the stator 2 further includes insulating sheets 25 disposed on the inner surfaces of the plurality of slots 213. The insulating sheets 25 have sheet end portions 25a that protrude from the slots 213 in the axial direction A. The length of the sheet end portions 25a in the axial direction A is smaller than the length of the insulator members 24 in the axial direction A.

[0075] The insulating sheet 25 disposed on the inner surface of the slot 213 has a bent portion 253 between a portion along the side surface of the tooth portion 212 and a portion along the outer peripheral surface of the core back portion 211 when viewed in the axial direction A. Therefore, the insulating sheet 25 may break if an outward expanding force is applied.

[0076] In contrast, in the above-described configuration, the insulator member 24 is located outward of the sheet end 25a of the insulating sheet 25 that protrudes from the slot 213. Therefore, the sheet end 25a does not expand outward even when pressed by the coil 22. This prevents the insulating sheet 25 from breaking.

[0077] The motor 1 according to this embodiment also includes a stator 2 and a rotor 3 having a magnet 31 that faces the stator 2 in the radial direction B.

[0078] This makes it possible to provide a motor 1 having a stator 2 that can improve the durability of the coil 22 and that prevents the coil 22 from moving in the radial direction B relative to the teeth portion 212.

[0079] (Variation) Next, an insulator member 124 according to a modified example will be described with reference to Fig. 10. In this modified example, the shape of the tooth cover portion 1242 of the insulator member 124 differs from the shape of the tooth cover portion 242 of the insulator member 24 according to embodiment 1. Fig. 10 is a cross-sectional view of the tooth portion 212 and the insulator member 124 cut in the circumferential direction.

[0080] 10 , in this modification, the length of tooth cover portion 1242 in the circumferential direction C increases with increasing distance from tooth portion 212. That is, in this modification, the length of tooth cover portion 1242 on the protruding portion 243 side in the circumferential direction C is greater than the length of tooth cover portion 1242 on the tooth portion 212 side in the circumferential direction C.

[0081] Resin components are molded using a resin molding die. Therefore, the resin component usually has a draft angle formed on an end face extending in the thickness direction to facilitate removal from the resin molding die. Therefore, in the resin component, either a corner of one surface on one side in the thickness direction or a corner of the other surface on the other side in the thickness direction protrudes in the direction in which the surface extends.

[0082] In this modification, the tooth cover portion 1242 protrudes in the circumferential direction C on the side opposite to the tooth portion 212. Therefore, when the coil 22 is wound around the tooth cover portion 1242, the coil 22 can be positioned in a circumferential position where it does not come into contact with the corners of the tooth portion 212. This prevents the coil 22 from coming into contact with the corners when the coil 22 is wound around the tooth portion 212. Therefore, peeling of the coating of the coil 22 can be further suppressed.

[0083] In this modification, the length L1 of the tooth cover portion 1242 on the protruding portion 243 side in the circumferential direction C is equal to or smaller than the length L0 of the tooth portion 212 in the circumferential direction C.

[0084] That is, tooth cover portion 1242 does not protrude into slot 213. Therefore, coil 22 can be wound along the side surface of tooth portion 212. This improves the space factor of the coil in the slot compared to a configuration in which the tooth cover portion protrudes into the slot as viewed in axial direction A.

[0085] (Other embodiments) Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to appropriately modify the above-described embodiments within the scope of the spirit of the present invention.

[0086] In the above embodiment, the configuration of the motor 1 has been described as an in-wheel motor disposed on the rear wheel of an electric motorcycle. However, the motor does not have to be a motor for an electric motorcycle. The motor may be a general motor having a stator and a rotor.

[0087] In the above embodiment, the motor 1 is a so-called outer rotor type motor in which the magnet 31 of the rotor 3 is arranged radially outward from the stator 2. However, the motor may also be a so-called inner rotor type motor in which the magnet of the rotor is arranged radially inward from the stator.

[0088] In each drawing, the end surface of the core back portion 211 of the stator 2 in the radial direction B is circular when viewed in the axial direction A. However, the end surface of the core back portion of the stator in the radial direction B may be polygonal when viewed in the axial direction A.

[0089] In the above embodiment, the rotor 3 has a magnet 31, a yoke 32, and a rim 33. The magnet 31 and the yoke 32 to which the magnet 31 is fixed are separate bodies. However, the rotor does not have to have a yoke. In this case, the rotor may have a ring-shaped magnet, which may also function as a yoke. The magnet may be fixed to the rim or another member.

[0090] In the above embodiment, the tooth cover portions 242, 1242 have the same configuration. However, the configuration of some of the tooth cover portions may be different from the configuration of the other tooth cover portions.

[0091] In the embodiment, the pair of protrusions 243 are positioned symmetrically with respect to the line of symmetry. The shapes of the pair of protrusions 243 are symmetrical with respect to the line of symmetry. However, the pair of protrusions do not have to be positioned symmetrically with respect to the line of symmetry. The shapes of the pair of protrusions do not have to be symmetrical with respect to the line of symmetry. For example, one and the other of the pair of protrusions may have different lengths in the axial direction A. One and the other of the pair of protrusions may have different lengths in the circumferential direction C. One and the other of the pair of protrusions may have different inclination angles.

[0092] In the embodiment, the pair of protrusions 243 are plate-shaped with a length in the circumferential direction C that is smaller than the length in the protruding direction. However, the pair of protrusions may also be columnar with a length in the circumferential direction C that is equal to or greater than the length in the protruding direction.

[0093] In the above embodiment, the pair of protrusions 243 are plate-shaped and have a uniform length in the circumferential direction C from the base end 243c to the tip end 243d. However, the pair of protrusions may be triangular or dome-shaped, with the length in the circumferential direction C decreasing as the protrusions are further away from the tooth cover portion.

[0094] In each drawing of the embodiment, the inner surfaces 243a of the pair of protrusions 243 are spaced apart in the circumferential direction C. However, the inner surfaces of the pair of protrusions do not have to be spaced apart in the circumferential direction C as shown in each drawing. It is preferable that the inner surfaces of the pair of protrusions are spaced apart in the circumferential direction C by a distance greater than the sum of the length in the circumferential direction C of one of the pair of protrusions and the length in the circumferential direction C of the other protrusion.

[0095] In the above embodiment, the pair of protrusions 243 are inclined. However, the pair of protrusions do not have to be inclined.

[0096] In the above embodiment, the pair of protrusions 243 extend in the axial direction A before the coil 22 is wound around the tooth portion 212, and are tilted by the winding of the coil 22. However, the pair of protrusions may be tilted before the coil is wound around the tooth portion.

[0097] In the above embodiment, the length in the axial direction A of the sheet end portion 25a of the insulating sheet 25 is smaller than the length in the axial direction A of the insulator member 24. However, the length in the axial direction A of the sheet end portion of the insulating sheet may be equal to or greater than the length in the axial direction A of the insulator member.

[0098] (Configuration example) The present technology can also be configured as follows.

[0099] (1) The stator includes a stator core having a cylindrical core back portion extending in the axial direction and a plurality of teeth extending radially from the core back portion and aligned in the circumferential direction C, with a plurality of slots aligned in the circumferential direction C between adjacent teeth of the plurality of teeth, an insulator member covering an axial end face of the stator core, and a coil wound around each of the plurality of teeth via the insulator member. The insulator member has tooth cover portions respectively disposed on the axial end faces of the plurality of teeth, and a pair of protrusions protruding in the axial direction from one end and the other end of the tooth cover portion in the circumferential direction C. The coil is in contact with outer surfaces opposite to the opposing inner surfaces of the pair of protrusions.

[0100] (2) In the stator described in (1), the pair of protrusions are plate-shaped and inclined toward each other as they move away from the tooth cover portion. The insulator member has a space between the inner surfaces of the pair of protrusions and a surface of the tooth cover portion facing the protrusions.

[0101] (3) In the stator described in (1) or (2), the pair of protrusions are plate-shaped and inclined in a direction approaching each other as they move away from the tooth cover portion, and have a plastic deformation portion at their base end.

[0102] (4) In the stator according to any one of (1) to (3), the pair of protrusions protrude in the axial direction from one end and the other end in the circumferential direction C of the tooth cover portion, respectively.

[0103] (5) In the stator according to (4), The insulator further includes an insulating sheet disposed on the inner surface of the plurality of slots, the insulating sheet having a sheet end portion protruding axially from the slot, the axial length of the sheet end portion being smaller than the axial length of the insulator member.

[0104] (6) In the stator according to any one of (1) to (5), the insulator member has a core back cover portion disposed on an axial end face of the core back portion, and the core back cover portion has a plurality of ribs protruding from a surface opposite to the surface on the core back portion side.

[0105] (7) In the stator described in any one of (1) to (6), the circumferential length of the tooth cover portion on the protrusion side is greater than the circumferential length of the tooth cover portion on the tooth side.

[0106] (8) In the stator according to (7), The circumferential length of the tooth cover portion on the protruding portion side is equal to or smaller than the circumferential length of the tooth portion.

[0107] (9) A motor includes the stator according to any one of (1) to (8) and a rotor having a magnet that faces the stator in the radial direction. [Industrial Applicability]

[0108] The present invention can be used in an insulator member of a stator. [Explanation of symbols]

[0109] 1 motor 2 stator 3 rotors 4 shafts 5 Stator holder 6 Bearings 21 Stator core 22 coils 22a conductor 24, 124 Insulator member 25 Insulation sheet 25a Sheet end 31 Magnet 32 York 33 rims 34 No. 1 Wheel Cover 35 Second wheel cover 35a Brake drum 51 Through hole 211 Core back part 212 Teeth 213 Slots 241 Core back cover part 241a Rib section 242, 1242 Teeth cover part 243 Protrusion 243a Inside surface 243b External surface 243c proximal end 243d Tip 244 Plastically deformed part 251 Teeth contact area 252 Core back contact area 253 Bend R Bent part of coil S Space between protrusion and teeth cover L0 Circumferential length of teeth L1 Circumferential length of the protruding part of the teeth cover

Claims

1. a stator core having a cylindrical core back portion extending in an axial direction and a plurality of teeth portions extending radially from the core back portion and arranged in a circumferential direction, wherein a plurality of slots arranged in a circumferential direction are formed between circumferentially adjacent teeth portions among the plurality of teeth portions; an insulator member covering an axial end face of the stator core; a coil wound around each of the plurality of teeth via the insulator member; A stator having The insulator member is tooth cover portions disposed on end faces of the plurality of teeth in the axial direction, respectively; a pair of protruding portions protruding in the axial direction from one end and the other end of the teeth cover portion in the circumferential direction, respectively; and The coil is in contact with outer surfaces of the pair of protrusions opposite to the inner surfaces facing each other. Stator.

2. 2. The stator according to claim 1, The pair of protrusions are plate-shaped and inclined in directions approaching each other as they move away from the teeth cover portion, The insulator member has a space between the inner surfaces of the pair of protrusions and a surface of the tooth cover portion facing the protrusions. Stator.

3. 3. The stator according to claim 2, The pair of protrusions are plate-shaped and inclined in a direction toward each other as they move away from the tooth cover portion, and have plastic deformation portions at their base ends. Stator.

4. 2. The stator according to claim 1, The pair of protrusions protrude in the axial direction from one end and the other end of the tooth cover portion in the circumferential direction, respectively. Stator.

5. 5. The stator according to claim 4, further comprising an insulating sheet disposed on an inner surface of the plurality of slots; the insulating sheet has a sheet end portion that protrudes axially from the slot; The axial length of the sheet end portion is smaller than the axial length of the insulator member. Stator.

6. 2. The stator according to claim 1, the insulator member has a core back cover portion disposed on an axial end surface of the core back portion, The core back cover portion has a plurality of rib portions protruding from a surface opposite to the surface on the core back portion side. Stator.

7. 2. The stator according to claim 1, a circumferential length of the tooth cover portion on the protrusion side is greater than a circumferential length of the tooth cover portion on the tooth portion side; Stator.

8. 8. The stator according to claim 7, The circumferential length of the tooth cover portion on the protruding portion side is equal to or smaller than the circumferential length of the tooth portion. Stator.

9. A stator according to any one of claims 1 to 8; a rotor having a magnet radially opposed to the stator; A motor having

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