JP2023032766A - stator and motor - Google Patents

Abstract

To provide a technique that makes it possible to properly arrange insulating sheets in a stator.SOLUTION: The stator includes an annular core back centered on a central axis extending vertically, a plurality of teeth 112 extending radially from the core back, a winding 12 arranged on the teeth, insulating paper 142 arranged in a circumferential direction between the teeth and the winding, and members arranged at a position where at least a portion of the members are away in the radial direction from the core back with respect to the insulating paper and disposed in a slot 15 between the teeth adjacent to each other in the circumferential direction.SELECTED DRAWING: Figure 9

Description

The present disclosure relates to stators and motors.

Conventionally, in an electric motor provided with a stator and a rotor having slots between teeth, there is known a configuration in which wedges formed of an insulating material are provided so as to close the inner peripheral opening of the slots (for example, patent Reference 1).

JP-A-2008-245403

By the way, when arranging the windings on the teeth, insulating paper is sometimes arranged between the side surfaces of the teeth and the windings in order to ensure insulation. The insulating paper may move radially when the wire is wound around the teeth. Radial movement of the insulating paper can cause changes in the space within the slot, making it difficult to place the components as designed. Also, when placing the wedges in the slots, the wedges can adversely affect the insulating paper if the wedges are placed haphazardly.

An object of the present disclosure is to provide a technique capable of appropriately arranging insulating paper in a stator.

An exemplary stator of the present disclosure includes an annular core back centered on a vertically extending central axis, a plurality of teeth extending radially from the core back, windings arranged on the teeth, and the teeth. Insulating paper disposed between the windings in the circumferential direction, and between the teeth adjacent to each other in the circumferential direction, which are disposed at least partially away from the core-back in the radial direction relative to the insulating paper. and a member disposed within the slot where is .

An exemplary motor of the present disclosure has a stator configured as described above and a rotor having magnets diametrically opposed to the stator.

According to the present disclosure, the insulating paper can be appropriately arranged in the stator.

FIG. 1 is a schematic diagram showing the configuration of an electric motorcycle according to an embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view showing the configuration of the motor according to the embodiment of the present disclosure. FIG. 3 is a schematic perspective view showing the configuration of a stator according to an embodiment of the present disclosure; FIG. FIG. 4 is a schematic perspective view showing the configuration of the stator core according to the embodiment of the present disclosure. FIG. 5 is a schematic perspective view showing an enlarged part of the stator from which windings are removed. FIG. 6 is a schematic perspective view showing the configuration of the insulating resin according to the embodiment of the present disclosure. FIG. 7 is a schematic perspective view showing the configuration of insulating paper according to the embodiment of the present disclosure. FIG. 8 is a schematic perspective view showing the structure around the circuit board of the stator. FIG. 9 is a schematic plan view showing the structure around the wedge.

Exemplary embodiments of the present disclosure are described in detail below with reference to the drawings. In this specification, when describing the electric motorcycle 200 having the motor 100 according to the embodiment of the present disclosure, the front and rear expressions are used with reference to the driver who drives the electric motorcycle 200 . In describing the motor and stator, the direction in which the central axis A of the motor 100 shown in FIG. hereinafter referred to as "direction" and "circumferential direction". Further, in this specification, when describing the motor and stator, the direction parallel to the axial direction when the motor 100 is arranged in the direction shown in FIG. 2 is defined as the vertical direction. The orientations defined herein are merely descriptive names and do not limit the actual positional relationships or orientations.

<1. Electric motorcycle>
FIG. 1 is a schematic diagram showing the configuration of an electric motorcycle 200 according to an embodiment of the present disclosure. The electric motorcycle 200 has a motorcycle body portion 201 having a seat portion 201a on which the rider sits. A front wheel 202 is arranged in front of the bike main body 201 . A rear wheel 203 is arranged behind the bike main body 201 . The bike main body 201 is provided movably with respect to the ground using front wheels 202 and rear wheels 203 .

A rider sitting on the seat portion 201a grips the handle 204 arranged in front to operate the electric motorcycle 200 in the traveling direction. Rear wheel 203 has motor 100 . Motor 100 is a so-called in-wheel motor. The steering wheel 204 is provided with a throttle (not shown). In the electric motorcycle 200, the drive of the motor 100 is controlled according to the throttle operation by the rider.

In this embodiment, the motor 100 is provided on the rear wheel 203 , but the motor 100 may be provided on the front wheel 202 . In addition, the motor of the present disclosure may be applied to other moving bodies, not limited to electric motorcycles. Mobile objects may include, for example, automobiles, motorcycles, ships, and aircraft. Also, the motor of the present disclosure may be applied not only to mobile objects but also to home appliances.

<2. Motor>
FIG. 2 is a schematic cross-sectional view showing the configuration of the motor 100 according to the embodiment of the present disclosure. Note that FIG. 2 shows only a half structure of the motor 100 with the central axis A of the motor 100 as a reference. As shown in FIG. 2, motor 100 has stator 1 and rotor 2 . The motor 100 further has a shaft 3 , a stator holder 4 and bearings 5 .

The shaft 3 has a columnar shape extending axially about the central axis A. As shown in FIG. The shaft 3 is non-rotatably attached to the bike main body 201 of the electric bike 200 . The stator holder 4 has a cylindrical shape centered on the central axis A. As shown in FIG. Specifically, the stator holder 4 has a bottomed tubular shape extending in the axial direction. At the center of the stator holder 4, a stator holder cylindrical portion 41 extending in the axial direction around the central axis A is provided. The shaft 3 is put in the stator holder tubular portion 41 and protrudes from above and below the stator holder tubular portion 41 . For example, the stator holder 4 is fixed to the shaft 3 by press-fitting the shaft 3 into the stator holder tubular portion 41 .

Stator 1 is the armature of motor 100 . The stator 1 has an annular shape centered on the central axis A. As shown in FIG. The stator 1 is arranged radially outward of the stator holder 4 and fixed to the stator holder 4 . That is, the stator 1 is non-rotatably fixed to the shaft 3 . Details of the stator 1 will be described later.

The rotor 2 has magnets 21 radially facing the stator 1 . In this embodiment, the magnet 21 is arranged radially outward of the stator 1 with a gap therebetween. A plurality of magnets 21 are arranged in the circumferential direction. Specifically, a plurality of magnets 21 are arranged at regular intervals in the circumferential direction. However, the number of magnets does not have to be plural, and one annular magnet may be used.

The rotor 2 specifically has a rim 22 , a wheel cover 23 and a brake drum 24 . The rim 22 has a cylindrical shape extending axially about the central axis A. As shown in FIG. Magnet 21 is fixed to the inner peripheral surface of rim 22 . A tire (not shown) is attached to the radially outer side of the rim 22 .

The wheel cover 23 is arranged radially inward on the upper portion of the rim 22 . The wheel cover 23 is rotatably attached to the shaft 3 via bearings 5 such as ball bearings. The wheel cover 23 has an outer peripheral portion fixed to the rim 22 . That is, the wheel cover 23 is provided rotatably about the central axis A together with the rim 22 .

A brake drum 24 is disposed radially inwardly below the rim 22 . The brake drum 24 is rotatably attached to the shaft 3 via a bearing 5 such as a ball bearing. The brake drum 24 is fixed to the rim 22 at its outer peripheral portion. That is, the rim 22, the wheel cover 23, and the brake drum 24 are provided rotatably about the central axis A. As shown in FIG.

The stator 1 is arranged in an internal space 300 formed by attaching the wheel cover 23 and the brake drum 24 to the tubular rim 22 . The rotor 2 rotates about the central axis A due to circumferential torque generated by supplying a drive current to the stator 1 .

The motor 100 of this embodiment is a so-called outer rotor type motor in which the magnets 21 of the rotor 2 are arranged radially outward of the stator 1 . However, the technology of the present disclosure is applicable not only to outer rotor type motors, but also to so-called inner rotor type motors in which the magnets of the rotor are arranged radially inward of the stator.

<3. Stator>
(3-1. Overview of stator configuration)
FIG. 3 is a schematic perspective view showing the configuration of the stator 1 according to the embodiment of the present disclosure. 3 also shows a shaft 3 and a stator holder 4 in addition to the stator 1. As shown in FIG. As shown in FIG. 3 , stator 1 has stator core 11 and windings 12 . The stator 1 further has a circuit board 13 .

The stator core 11 is arranged radially inward of the magnet 21 with a gap from the magnet 21 . Stator core 11 is a magnetic material. In this embodiment, the stator core 11 is configured by laminating electromagnetic steel sheets. FIG. 4 is a schematic perspective view showing the configuration of the stator core 11 according to the embodiment of the present disclosure.

As shown in FIG. 4 , stator core 11 has core back 111 and a plurality of teeth 112 . That is, stator 1 has core back 111 and multiple teeth 112 . The core back 111 has an annular shape centered on a central axis A extending vertically. The core back 111 is specifically annular. Teeth 112 extend radially from core back 111 . In this embodiment, teeth 112 extend radially outward from core back 111 . A plurality of teeth 112 are arranged at intervals in the circumferential direction. In this embodiment, the multiple teeth 112 are arranged at equal intervals in the circumferential direction.

As shown in FIG. 4, each tooth 112 has a tooth body portion 112a extending radially outward from the core back 111 and an umbrella portion 112b arranged radially outward of the tooth body portion 112a. Umbrella portion 112b extends in the circumferential direction. Umbrella portion 112b has a portion extending in one circumferential direction with respect to one circumferential end of teeth body portion 112a. Umbrella portion 112b has a portion extending to the other side in the circumferential direction with respect to the other end in the circumferential direction of teeth body portion 112a. That is, the umbrella portion 112b is wider in the circumferential direction than the tooth main body portion 112a.

The windings 12 are arranged on the teeth 112 . Specifically, a winding 12 is arranged on each of the plurality of teeth 112 . More specifically, windings 12 are arranged on all teeth 112 of stator core 11 . The winding 12 is formed by winding a conductor covered with an insulator around teeth. More specifically, the winding 12 is formed by coiling a conductive wire around the tooth main body 112a. Specifically, the windings 12 are arranged on the tooth main body 112a.

Note that the motor 100 of this embodiment is a three-phase motor having a U-phase, a V-phase, and a W-phase. For this reason, the conductors forming the winding 12 include a U-phase conductor, a V-phase conductor, and a W-phase conductor. When a drive current is supplied to the windings 12 , radial magnetic flux is generated in the teeth 112 . As a result, torque in the circumferential direction is generated in the rotor 2 having the magnets 21, and the rotor 2 rotates about the central axis A. As shown in FIG.

FIG. 5 is a schematic perspective view showing an enlarged part of the stator 1 with the windings 12 removed. Specifically, as shown in FIG. 5 , the windings 12 are arranged on the teeth 112 via the insulators 14 . That is, stator 1 has insulator 14 . The insulator 14 is an insulator.

In this embodiment, the insulator 14 has a first insulator 141 and a second insulator 142 . The first insulator 141 and the second insulator 142 are separate members. Specifically, the first insulator 141 is made of resin. The second insulator 142 is made of paper. Note that the second insulator 142 may be made of resin. The first insulator 141 is hereinafter referred to as the insulating resin 141 . The second insulator 142 is expressed as insulating paper 142 . That is, stator 1 has insulating resin 141 . The stator 1 has insulating paper 142 .

As shown in FIG. 5 , the insulating resin 141 is arranged axially above and below the stator core 11 . In this embodiment, the insulating resin 141 arranged axially above the stator core 11 and the insulating resin 141 arranged axially below have the same shape. FIG. 6 is a schematic perspective view showing the configuration of the insulating resin 141 according to the embodiment of the present disclosure. As shown in FIG. 6 , the insulating resin 141 has an insulator annular portion 1411 and a plurality of insulator protrusions 1412 .

The insulator annular portion 1411 has an annular shape centered on the central axis A and has a plate shape. The insulator annular portion 1411 is arranged at a position in contact with the core back 111 . In insulating resin 141 arranged axially above stator core 11 , insulator annular portion 1411 contacts the top surface of core back 111 and covers at least a portion of the top surface of core back 111 . In insulating resin 141 arranged axially below stator core 11 , insulator annular portion 1411 contacts the lower surface of core back 111 and covers at least a portion of the lower surface of core back 111 .

The insulator protrusion 1412 protrudes radially outward from the insulator annular portion 1411 . The insulator protrusion 1412 is plate-shaped like the insulator annular portion 1411 . The plurality of insulator protrusions 1412 are arranged at regular intervals in the circumferential direction. Insulator protrusion 1412 is arranged at a position to contact teeth 112 . The number of insulator protrusions 1412 is the same as the number of teeth 112 . In insulating resin 141 arranged axially above stator core 11 , each insulator projection 1412 contacts the upper surface of tooth 112 and covers at least a portion of the upper surface of tooth 112 . In insulating resin 141 arranged axially below stator core 11 , each insulator protrusion 1412 contacts the lower surface of tooth 112 and covers at least a portion of the lower surface of tooth 112 .

As can be seen from the above description, the insulating resin 141 is arranged between the tooth 112 and the winding 12 in the axial direction. Specifically, the insulator protrusion 1412 is arranged between the tooth 112 and the winding 12 in the axial direction.

FIG. 7 is a schematic perspective view showing the configuration of the insulating paper 142 according to the embodiment of the present disclosure. As shown in FIGS. 5 and 7, the insulating paper 142 is arranged in the slots 15 between the teeth 112 adjacent in the circumferential direction. Specifically, an insulating paper 142 is arranged in each of the plurality of slots 15 . The number of slots 15 is the same as the number of teeth 112 . That is, the insulating paper 142 also exists in the same number as the plurality of teeth 112 . The insulating paper 142 is folded and placed in the slot 15 .

As shown in FIG. 7 , the folded insulating paper 142 has a pair of tooth contact portions 1421 and a core-back contact portion 1422 . One of the pair of tooth contact portions 1421 contacts one circumferential side surface of two circumferentially adjacent teeth 112 . The other of the pair of tooth contact portions 1421 contacts the other circumferential side surface of the two circumferentially adjacent teeth 112 . The core-back contact portion 1422 contacts the radial outer peripheral surface of the core-back 111 .

Insulating paper 142 is arranged between tooth 112 and winding 12 in the circumferential direction. Specifically, tooth contact portion 1421 is arranged between tooth 112 and winding 12 in the circumferential direction. When the insulating paper 142 is used as the insulator, the volume of the insulator in the slot 15 can be reduced as compared with the case where the plate-like resin is used as the insulator. That is, by using the insulating paper 142 as an insulator, the volume of the slot 15 can be increased and the number of turns of the winding 12 can be increased.

FIG. 8 is a schematic perspective view showing the structure around the circuit board 13 of the stator 1. As shown in FIG. The circuit board 13 is provided with, for example, a wiring pattern for supplying the winding 12 with an output current from an external driver (not shown). The circuit board 13 is arranged axially above the windings 12 . The circuit board 13 extends in a direction parallel to a plane orthogonal to the axial direction. In the present embodiment, as shown in FIG. 3, the circuit board 13 is arranged in a portion of the stator 1 in the circumferential direction when viewed in plan from the axial direction. The circuit board 13 is supported by, for example, an insulator 14 or a dedicated support member.

As shown in FIG. 8, a position sensor 16 is attached to the circuit board 13 . A position sensor 16 detects the rotation angle of the rotor 2 . In this embodiment, the position sensor 16 is a Hall IC. The number of position sensors 16 may be at least one. In this embodiment, the number of position sensors 16 is three.

The position sensor 16 extends axially downward from the bottom surface of the circuit board 13 . Position sensor 16 is positioned at least partially within slot 15 . That is, the stator 1 further comprises a position sensor 16 arranged at least partially within the slot 15 . The position sensor 16 faces the magnet 21 of the rotor 2 in the radial direction. In this embodiment, a portion of position sensor 16 is positioned within slot 15 .

As shown in FIG. 8, the stator 1 has members 17 arranged in slots 15 . The member 17 is a separate member from the insulating paper 142 . The member 17 is an insulating member made of, for example, resin or fiber. The member 17 is made of, for example, Nomex (registered trademark). This member 17 is expressed as wedge 17 below. The wedge 17 will be described below.

(3-2. Wedge)
FIG. 9 is a schematic plan view showing the structure around the wedge 17. As shown in FIG. As shown in FIGS. 8 and 9 , the wedge 17 arranged in the slot 15 is arranged at a position radially further away from the core back 111 than the insulating paper 142 at least partially. In other words, the stator 1 is arranged at a position radially distant from the core back 111 at least partially relative to the insulating paper 142 and arranged in the slots 15 between the teeth 112 adjacent in the circumferential direction. It has a member 17 .

In order to increase the number of turns, the windings 12 are arranged from the root portion, which is the end of the teeth 112 on the core back 111 side, to a position close to the tip of the teeth 112 radially away from the core back 111 . Insulating paper 142 is arranged in a range wider than the range in which windings 12 are arranged in the radial direction in order to secure an insulation distance. In other words, insulating paper 142 has a portion that is located closer to the tip of tooth 112 than winding 12 . As described above, there is a possibility that the insulating paper 142 moves away from the core back 111 when the winding 12 is wound around the teeth 112 . However, in this embodiment, since the wedge 17 is arranged at the position described above, it is possible to restrict the one radial end of the insulating paper 142 from being radially separated from the core back 111 by a certain distance or more. More specifically, even if the insulating paper 142 tries to move radially outward, the wedges 17 fixed between the teeth 112 contact the insulating paper 142, so the movement of the insulating paper 142 can be suppressed. Therefore, the wedge 17 can be said to be a regulating member that regulates the position of the insulating paper 142 .

In this embodiment, at least a portion of the wedge 17 is arranged radially outward of the insulating paper 142 . The wedge 17 is secured in the slot 15, for example, by glue or the like. The wedge 17 can prevent the radially outer end of the insulating paper 142 from being radially outwardly separated from the core back 111 by a certain distance or more.

By the way, if the insulating paper 142 moves away from the core back 111 when the winding 12 is wound around the teeth 112, the insulating paper 142 may enter the space in the slot 15 where the position sensor 16 is to be arranged. be. That is, the movement of the insulating paper 142 may make it difficult to arrange the position sensor 16 .

In this regard, in the present embodiment, the position sensor 16 is arranged above the wedge 17 in the axial direction. In other words, the position sensor 16 is arranged axially above the member 17 . With this configuration, the wedge 17 can prevent the insulating paper 142 from moving radially away from the core back 111 . As a result, the wedge 17 can prevent the insulating paper 142 from entering the space where the position sensor 16 is arranged. That is, the space for arranging the position sensor 16 can be appropriately secured by the wedge 17 .

In this embodiment, the position sensor 16 and the wedge 17 are arranged at the radially outer end of the slot 15 . Specifically, the position sensor 16 and the wedge 17 are arranged with a gap therebetween in the axial direction.

As can be seen from the above, in the motor 100 of the present embodiment, the arrangement of the wedges 17 can improve the assembly efficiency of the stator 1 . That is, the motor 100 of this embodiment can be efficiently manufactured.

The wedges 17 may be arranged in all of the plurality of slots 15 that the stator 1 has. However, in this embodiment, the wedges 17 are arranged in some of the plurality of slots 15 . In other words, the members 17 are arranged in some of the slots 15 . Some slots 15 include slots 15 in which position sensors 16 are located. According to such a configuration, it is possible to reduce the number of wedges 17 as much as possible while appropriately securing the space for arranging the position sensor 16 by the wedges 17, thereby reducing the manufacturing cost and the work load.

In this embodiment, the number of some slots 15 in which wedges 17 are arranged is seven. However, since the number of position sensors 16 is three, the number of wedges 17 may be three. In this embodiment, the three position sensors 16 are arranged in the slots 15 every three slots in the circumferential direction. That is, in the circumferential direction, the range in which the three position sensors 16 are arranged is seven slots. Wedges 17 are arranged in these seven slots. With such a configuration, it is possible to easily grasp the place where the position sensor 16 is arranged. That is, workability can be improved.

In this embodiment, the wedge 17 has a columnar shape extending in the axial direction. In other words, the member 17 has a columnar shape extending in the axial direction. With such a configuration, the handleability of the wedge 17 during work can be improved. Specifically, the wedge 17 extends straight in the axial direction. Note that the wedge 17 may have other shapes such as a hollow shape.

Also, the wedge 17 has a shorter axial length than the teeth 112 . In other words, the members 17 are shorter in axial length than the teeth 112 . With such a configuration, there is no need to process the wedge 17 to provide a concave portion for the purpose of arranging the position sensor 16, and the structure for arranging the position sensor 16 in the slot 15 can be simplified. can.

Specifically, the upper surfaces of the wedges 17 are lower than the upper surfaces of the teeth 112 . The upper surface of the wedge 17 is positioned at a height such that the position sensor 16 can be placed at a predetermined position within the slot 15 . Note that the lower surface of the wedge 17 may be at the same position as the lower surface of the tooth 112 or at a position higher than the lower surface of the tooth 112 . Also, the lower surfaces of the wedges 17 may be lower than the lower surfaces of the teeth 112 . However, it is preferable that the lower surface of the wedge 17 is at the same height as or higher than the lower surface of the insulating resin 141 arranged below the stator core 11 .

As shown in FIG. 9 , the wedge 17 has a first curved surface portion 171 that protrudes radially away from the core back 111 . In other words, the member 17 has the first curved surface portion 171 that protrudes in the radial direction away from the core back 111 . The first curved surface portion 171 constitutes a side surface of the wedge 17 extending in the axial direction. By configuring the wedge 17 to have the curved side surface in this way, the wedge 17 can be easily arranged along the radially inner surface of the curved umbrella portion 112b.

In this embodiment, the wedge 17 is located at the radially outer end of the slot 15 . The radially outer end of the slot 15 is defined by the radially inner surface of the umbrella portion 112b. The radially inner surface of the umbrella portion 112b has a curved surface structure in which the amount of protrusion in the circumferential direction from the tooth main body portion 112a decreases as it goes radially inward. The curved surface is specifically concave. Since the wedge 17 has the convex first curved surface portion 171, the wedge 17 can be easily arranged along the radially inner surface of the concave umbrella portion 112b. In this embodiment, the first curved surface portion 171 faces the radially inner surface of the umbrella portion 112b. The first curved surface portion 171 and the umbrella portion 112b may be in direct contact, or may be in indirect contact via an interposition such as an adhesive. The first curved surface portion 171 may be, for example, an arc-shaped curved surface or an elliptical arc-shaped curved surface.

Moreover, the wedge 17 has a second curved surface portion 172 or an inclined surface portion that approaches the core back 111 as it is separated from the teeth 112 adjacent in the circumferential direction in the circumferential direction. In other words, the member 17 has the second curved surface portion 172 or the inclined surface portion that approaches the core back 111 as the distance from the teeth 112 adjacent in the circumferential direction increases in the circumferential direction. The second curved surface portion 172 or the inclined surface portion constitutes a side surface of the wedge 17 extending in the axial direction.

With this configuration, when the winding 12 is wound around the tooth 112, a portion of the insulating paper 142 that is about to move away from the core back 111 in the radial direction is caused to follow the second curved surface portion 172 or the inclined surface portion. It is possible to make it easier to move toward the core back 111 by pressing. That is, one end of the insulating paper 142 can be easily folded along the second curved surface portion 172 in the direction in which the core back 111 exists.

In this embodiment, the wedge 17 has a second curved portion 172 . The second curved surface portion 172 is connected to the first curved surface portion 171 . Specifically, the wedge 17 includes a second curved surface portion 172 circumferentially facing the teeth 112 arranged on one side in the circumferential direction, and a second curved surface portion 172 circumferentially facing the teeth 112 arranged on the other side in the circumferential direction. It has two curved surface portions 172 and two second curved surface portions 172 . The second curved surface portion 172 may have the same curvature as the first curved surface portion 171 or may have a different curvature from the first curved surface portion 171 . The second curved surface portion 172 is not limited to a convex curved surface, and may be a concave curved surface. The curved surface may be, for example, an arc-shaped curved surface or an elliptical arc-shaped curved surface. When the wedge 17 has an inclined surface portion instead of the second curved surface portion 172 , the inclined surface portion is connected to the first curved surface portion 171 .

In addition, in the present embodiment, the wedge 17 has a planar portion 173 that radially faces the core back 111 and is connected to the second curved surface portion 172 or the inclined surface portion. In other words, the member 17 has a planar portion 173 that radially faces the core back 111 and is connected to the second curved surface portion 172 or the inclined surface portion. The flat portion 173 constitutes a side surface of the wedge 17 extending in the axial direction. According to such a configuration, it is possible to reduce the amount of protrusion of the wedge 17 in the direction toward the core back 111 and to easily secure a space for winding the winding 12 . In this embodiment, the flat portion 173 connects the two second curved portions 172 .

Note that the flat portion 173 may not be provided. In this case, for example, the two second curved surface portions 172 may be connected so that the two connected second curved surface portions 172 form one curved surface that protrudes in the radial direction approaching the core back 111. . The curved surface may be, for example, an arc-shaped curved surface or an elliptical arc-shaped curved surface. Alternatively, the wedge 17 may be configured to have only the first curved surface portion 171 and the flat surface portion without the second curved surface portion 172 or the inclined surface portion. In this case, the wedge 17 may have, for example, a semi-circular shape or a semi-elliptical shape in plan view from the axial direction.

As described above, insulating paper 142 has tooth contact portions 1421 that contact teeth 112 . In this embodiment, as shown in FIG. 9 , the insulating paper 142 further has folded portions 1423 connected to the tooth contact portions 1421 and folded back toward the core back 111 . At least part of the folded portion 1423 contacts the wedge 17 . In other words, at least part of the folded portion 1423 contacts the member 17 . With such a configuration, the wedge 17 can maintain the insulating paper 142 in a folded state. As a result, it is possible to prevent the insulating paper 142 from spreading in an inappropriate direction.

<4. Notes>
Various modifications can be made to the various technical features disclosed in this specification without departing from the gist of the technical creation. In addition, the multiple embodiments and modifications shown in this specification may be implemented in combination to the extent possible.

The technology of the present disclosure can be widely used, for example, in vehicles such as electric motorcycles and automobiles, ships, aircraft, robots, home appliances, and the like.

DESCRIPTION OF SYMBOLS 1... Stator 2... Rotor 12... Winding 15... Slot 16... Position sensor 17... Member, wedge 21... Magnet 100... Motor 111... Core back DESCRIPTION OF SYMBOLS 112... Teeth 142... 2nd insulator, insulating paper 171... 1st curved-surface part 172... 2nd curved-surface part 173... Flat part 1421... Teeth contact part 1423... Folding part A: central axis

Claims (10)

an annular core back centered on a vertically extending central axis;
a plurality of teeth radially extending from the core back;
windings arranged on the teeth;
insulating paper disposed between the teeth and the winding in the circumferential direction;
a member, at least a portion of which is located radially away from the core back relative to the insulating paper, and which is located in a slot between the circumferentially adjacent teeth;
A stator. further comprising a position sensor positioned at least partially within the slot;
2. The stator of claim 1, wherein the position sensor is located axially above the member. The member is arranged in some of the plurality of slots,
3. The stator according to claim 2, wherein said some slots include a slot in which said position sensor is arranged. 4. The stator according to any one of claims 1 to 3, wherein the member has a columnar shape extending in the axial direction. 5. The stator according to claim 4, wherein said member has a shorter axial length than said teeth. 6. The stator according to claim 4, wherein said member has a first curved surface portion that protrudes in a direction away from said core back in a radial direction. 7. The stator according to claim 6, wherein said member has a second curved surface portion or inclined surface portion that approaches said core-back as it is circumferentially separated from said teeth adjacent in said circumferential direction. 8. The stator according to claim 7, wherein the member has a planar portion facing the core back in a radial direction and connected to the second curved surface portion or the inclined surface portion. The insulating paper is
a tooth contact portion that contacts the tooth;
a folded portion connected to the tooth contact portion and folded back toward the core back;
has
9. The stator according to any one of claims 1 to 8, wherein at least part of said folded portion contacts said member. A stator according to any one of claims 1 to 9;
a rotor having a magnet radially facing the stator;
a motor.

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