WO2019082709A1

WO2019082709A1 - Stator and motor

Info

Publication number: WO2019082709A1
Application number: PCT/JP2018/038228
Authority: WO
Inventors: 晃弘大北; 貴之右田; 真郷青野
Original assignee: 日本電産株式会社
Priority date: 2017-10-27
Filing date: 2018-10-13
Publication date: 2019-05-02

Abstract

A stator comprising: an annular stator core having a center shaft as the center thereof; a support member arranged on one side of the stator core in the axial direction; and a coil attached to the stator core. The coil has a lead wire extending to one side of the support member in the axial direction. The support member has a through-hole that penetrates the support member in the axial direction and has the lead wire passing therethrough. At least one recessed section is provided in the inner circumferential surface of the through-hole, as viewed from the axial direction. The lead wire passes through the interior of the recessed section.

Description

Stator and motor

The present invention relates to a stator and a motor.

Conventionally, a motor has a rotor and a stator. The stator has a stator core and a coil attached to the stator core via an insulating member. The insulating member has a groove for receiving a lead wire or the like drawn from the coil. For example, the stator of Patent Document 1 includes a stator core, a stator winding, an end insulating member, and a housing member. The end insulation members are provided on both axial sides of the stator core. The housing member is provided on the opposite side to the stator core from the at least one end insulating member along the axial direction. The housing member has a housing groove forming portion. The housing groove forming portion has a housing groove for housing the end of the stator winding.

Patent No. 5762765 gazette

In the stator, a support member may be disposed on one side in the axial direction of the stator core. For example, a bus bar terminal or the like is provided on one side in the axial direction of the support member. A lead wire drawn from the coil is connected to the bus bar terminal or the like. There is room for improvement in making it easier to connect the lead wire to a connection target such as a bus bar terminal while making it easy to draw the lead wire during manufacturing of the stator and suppressing large tension from being applied to the lead wire. there were.

An object of the present invention is to provide a stator and a motor in which the lead wire can be easily routed in view of the above circumstances.

One aspect of the stator according to the present invention includes an annular stator core centered on a central axis, a support member disposed on one side in the axial direction of the stator core, and a coil attached to the stator core, the coil being A lead wire extending to one side in the axial direction of the support member, wherein the support member has a through hole axially penetrating the support member and through which the lead wire passes, viewed from the axial direction At least one recess is provided on an inner circumferential surface of the through hole, and the lead line passes through the inside of the recess.

Moreover, one aspect of the motor of the present invention includes the above-described stator, and a rotor that can rotate around the central axis with respect to the stator.

According to the stator and the motor of one aspect of the present invention, the lead wire can be easily routed.

FIG. 1 is a perspective view showing a stator and a motor of the present embodiment. FIG. 2 is a cross-sectional view showing the stator and the motor of the present embodiment. FIG. 3 is a perspective view showing a portion of a stator and a motor of the present embodiment. FIG. 4 is a perspective view showing a portion of a stator and a motor of the present embodiment. FIG. 5 is a plan view showing portions of the stator and the motor of the present embodiment. FIG. 6 is a plan view showing a first modification of the through hole. FIG. 7 is a plan view showing a second modification of the through hole. FIG. 8 is a plan view showing a third modification of the through hole. FIG. 9 is a plan view showing a fourth modification of the through hole. FIG. 10 is a plan view showing a fifth modification of the through hole.

The Z-axis direction appropriately shown in each drawing is a vertical direction with the positive side as the upper side and the negative side as the lower side. A central axis J appropriately shown in each drawing is an imaginary line which is parallel to the Z-axis direction and extends in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as “axial direction”, and the radial direction centering on the central axis J is simply referred to as “radial direction”. The circumferential direction centered on is simply referred to as "circumferential direction". In the present embodiment, the upper side corresponds to one side in the axial direction, and the lower side corresponds to the other side in the axial direction. Note that the vertical direction, the upper side and the lower side are simply names for describing the relative positional relationship of each part, and the actual arrangement relationship etc. is an arrangement relationship etc. other than the arrangement relationship etc. indicated by these names. May be

As shown in FIGS. 1 and 2, the motor 1 of the present embodiment includes a housing 11, a contact member 70, a rotor 80,

bearings

24 and 25, an attachment member 26, a sensor magnet 27, and a stator 10. And.

As shown in FIG. 2, the housing 11 accommodates the rotor 80 and the stator 10. The housing 11 has a lid 12, a cylinder 13, and a bearing holder 14. As shown to FIG. 1 and FIG. 2, the cover part 12 is plate shape to which a plate surface turns to an axial direction, and is annular ring shape along the circumferential direction. The lid 12 is centered on the central axis J. The lid 12 covers the upper side of the stator 10. More specifically, the lid 12 covers the upper side of the stator core 20, the insulator 50 and the coil 40 described later. The lid 12 has a window hole 17 penetrating the lid 12 in the axial direction. When viewed from the axial direction, the window hole 17 is in the shape of a circular arc extending in the circumferential direction. A plurality of window holes 17 are provided along the circumferential direction.

As shown in FIG. 1, a part of the lid 12 has a protrusion 12 a that protrudes upward. The protrusion 12 a is formed, for example, by pressing the lid 12. The upper surface of the protrusion 12 a is a flat surface. The upper surface of the protrusion 12 a extends in the direction orthogonal to the axial direction. The lid 12 has an attachment hole (not shown) which penetrates the lid 12 in the axial direction. The mounting hole axially penetrates the projection 12a.

The cylindrical portion 13 has a cylindrical shape extending downward from the radial outer edge of the lid 12. The cylindrical portion 13 is cylindrical with the central axis J as a center. The cylindrical portion 13 opens downward. At the lower end portion of the cylindrical portion 13, a plurality of collar portions protruding radially outward from the lower end portion of the cylindrical portion 13 are provided along the circumferential direction. As shown in FIG. 2, the bearing holder 14 is connected to the radially inner edge of the lid 12. The bearing holding portion 14 has a tubular shape extending downward from the radial inner edge portion of the lid 12. The bearing holder 14 is cylindrical around the central axis J and has a bottom. The bearing holder 14 holds the bearing 25. The outer peripheral surface of the bearing 25 is fixed to the inner peripheral surface of the bearing holding portion 14.

In the present embodiment, the housing 11 is made of metal, and is made of only a single metal member having the lid 12, the cylinder 13 and the bearing holder 14. That is, the housing 11 has a metal member made of metal having the lid 12 and the cylinder 13, and the metal member is a single member. The housing 11 is made of, for example, aluminum. The housing 11 is manufactured, for example, by pressing a metal plate member. The housing 11 may be configured of a plurality of members. Also, the housing 11 may be manufactured by a method such as cutting or casting. The material of the housing 11 may be other than metal.

The contact member 70 shown in FIG. 1 is a member attached to the housing 11 and capable of contacting a terminal of an external device (not shown). The external device is, for example, a control device that supplies power to the motor 1 to control the motor 1. The terminal of the external device in contact with the contact member 70 is, for example, a terminal for grounding. The terminals of the external device contact the upper surface of the contact member 70. The contact member 70 is disposed on the protrusion 12a.

The contact member 70 has a contact member main body and a claw portion (not shown). In the present embodiment, the contact member main body has a disk shape. Of the pair of plate surfaces of the contact member main body, the plate surface facing downward is in contact with the upper surface of the protrusion 12a. The claws extend downward from the contact member body. The claws are inserted into the attachment holes of the lid 12, for example crimped, and hooked on the lower surface of the projection 12a.

The contact member 70 is a conductive member. In the present embodiment, the contact member 70 is made of metal. The material of the contact member 70 is, for example, different from the material of the housing 11. The material of the contact member 70 may be the same as the material of the housing 11.

The rotor 80 is rotatable around the central axis J with respect to the stator 10. As shown in FIG. 2, the rotor 80 has a shaft 81, a rotor core 82, a rotor magnet 83, and an output portion 84. The shaft 81 is disposed along the central axis J. The shaft 81 has a cylindrical shape extending in the axial direction about the central axis J. The mounting member 26 is fixed to the upper end portion of the shaft 81. The mounting member 26 has a cylindrical shape that opens upward. A sensor magnet 27 is fixed to the inside of the mounting member 26. The sensor magnet 27 has a cylindrical shape that is flat in the axial direction centering on the central axis J. The output unit 84 is attached to the lower end of the shaft 81. In the present embodiment, the output unit 84 is cylindrical. The output unit 84 is used, for example, for fixing when the motor 1 is attached to a device or the like. The output unit 84 is, for example, a shaft coupling member or the like.

The rotor core 82 has a substantially annular shape fixed to the outer peripheral surface of the shaft 81. The rotor magnet 83 is fixed to the outer peripheral surface of the rotor core 82. The

bearings

24, 25 rotatably support the shaft 81. In the present embodiment, the

bearings

24 and 25 are, for example, ball bearings. The

bearings

24 and 25 may be bearings other than ball bearings as long as they can support the shaft 81 rotatably. The rotor core 82 may be directly fixed to the outer peripheral surface of the shaft 81 or may be fixed indirectly via a member or the like.

The stator 10 is radially opposed to the rotor 80 with a gap. More specifically, the stator 10 is disposed radially outside the rotor 80 with a gap. The stator 10 includes a stator core 20, an insulator 50, a coil 40, a support member 31, a bus bar terminal 43, and a molded resin portion 35.

The stator core 20 is annular around the central axis J. The stator core 20 surrounds the rotor 80 at the radially outer side of the rotor 80. The stator core 20 is disposed on the radially outer side of the rotor magnet 83 so as to face the space with a gap. The stator core 20 is, for example, a laminated steel plate configured by laminating a plurality of electromagnetic steel plates in the axial direction. The stator core 20 may be a dust core or the like.

The stator core 20 has a substantially annular core back 21 and a plurality of teeth 22. In the present embodiment, the core back 21 has an annular shape centered on the central axis J. The teeth 22 extend radially from the inner or outer surface of the core back 21. In the present embodiment, the teeth 22 extend radially inward from the core back 21. As shown in FIG. 2, the outer peripheral surface of the core back 21 is fixed to the inner peripheral surface of the cylindrical portion 13. The outer peripheral surface of the core back 21 is the outer peripheral surface of the stator core 20. That is, the outer peripheral surface of stator core 20 is fixed to the inner peripheral surface of cylindrical portion 13. In the present embodiment, the stator core 20 is fixed to the cylindrical portion 13 by press fitting. Although illustration is omitted, the plurality of teeth 22 are arranged at intervals in the circumferential direction. In the present embodiment, the plurality of teeth 22 are arranged at equal intervals along the circumferential direction.

The insulator 50 is attached to the stator core 20. The material of the insulator 50 is, for example, an insulating material such as a resin. As shown in FIGS. 2 to 4, the insulator 50 has a tubular extending portion 51 through which each tooth 22 passes, and an outer wall 52 located radially outside the extending portion 51. In FIGS. 3 and 4, the housing 11, the contact member 70 and the mold resin portion 35 are not shown.

The extending portion 51 covers the teeth 22. The extending portion 51 extends in the radial direction. The extension portion 51 is disposed between the stator core 20 and the coil 40. That is, the insulator 50 has a portion disposed between the stator core 20 and the coil 40, and this portion is the extending portion 51.

The outer wall 52 extends upward from the extension 51. The outer wall 52 is disposed radially outward of the coil 40 and extends in the circumferential direction. The outer wall 52 projects above the coil 40. According to the present embodiment, the outer wall 52 of the insulator 50 can ensure insulation between the coil 40 and the cylindrical portion 13 or the like. Also, the outer wall 52 contacts the support member 31 from the lower side.

In the present embodiment, the stator 10 has a plurality of coils 40. The coil 40 is attached to the stator core 20. The plurality of coils 40 are respectively attached to the stator core 20 at circumferential intervals. The plurality of coils 40 are attached to the stator core 20 via the insulators 50. The plurality of coils 40 are configured by winding a wire around each tooth 22 via the insulator 50. In the present embodiment, the winding system of the coil 40 is a so-called concentrated winding system. In addition, the winding system of the coil 40 may be another system other than the concentrated winding system. In the present embodiment, the stator 10 has three or more coils 40, specifically, six coils 40.

In the present embodiment, the motor 1 is a three-phase motor. The three phases are the U phase, the V phase and the W phase. In the case of a three-phase motor, each coil 40 of U-phase, V-phase and W-phase is constituted by any of three conductors (a first conductor, a second conductor and a third conductor). As shown in FIGS. 2 to 4, the coil 40 has a lead wire 42 and a connecting wire 41. The stator 10 is provided with a plurality of lead wires 42 and a plurality of crossover wires 41. In the present embodiment, six lead wires 42 are provided and two crossover wires 41 are provided.

The lead wire 42 and the connecting wire 41 are both arranged above the stator core 20. That is, the lead wires 42 and the crossover wires 41 are arranged on the same side of the stator core 20 in the axial direction. The lead wire 42 is drawn from the coil 40. The lead wire 42 is an end portion of a lead that constitutes the coil 40. The lead wire 42 extends upward from the coil 40. The crossover 41 connects between one coil 40 and the other coil 40 among the plurality of coils 40. The crossover 41 connects at least two coils 40 to each other. The crossover 41 is disposed below the support member 31. The crossover 41 extends above the coil 40 and below the support member 31. In the present embodiment, the first to third conductive wires constituting the coil 40 of each phase of the U phase, the V phase and the W phase each have a connecting wire 41 and a lead wire 42. That is, the connecting wire 41 and the lead wire 42 in each phase are a part of the conducting wires (first to third conducting wires) which constitute the coil 40 of each phase.

As shown in FIG. 5, among the plurality of coils 40, one coil 40 b has a lead wire 42 b. In FIG. 5, the housing 11, the contact member 70 and the mold resin portion 35 are not shown. The lead wire 42 b is a lead wire 42 b drawn from one coil 40 b among the lead wires 42 of the plurality of coils 40 included in the stator 10. The lead wire 42 b extends above the support member 31. Specifically, the lead wire 42 b extends upward from the coil 40 b, passes through a through hole 31 m (described later) of the support member 31 and is drawn to the upper side of the support member 31. The lead wire 42 b has a portion extending upward from the coil 40 b and a portion disposed above the support member 31. In the example of the present embodiment, the lead wire 42 b extends in the circumferential direction on the upper side of the support member 31. The lead wire 42 b is connected to the connection object on the upper side of the support member 31. In the present embodiment, the connection target is the bus bar terminal 43. That is, the lead wire 42 b is connected to the bus bar terminal 43 on the upper side of the support member 31.

The conducting wire (for example, the first conducting wire) constituting the coil 40b from which the lead wire 42b is drawn is a conducting wire (for example, the second conducting wire) constituting the plurality of coils 40 connected by the crossover 41 shown in FIG. It is different. That is, the conducting wire which comprises the coil 40b which has the lead-out wire 42b differs from the conducting wire which comprises one coil 40 and the other coil 40 which the crossover 41 shown in FIG. 5 connects. The current supplied to the lead wire 42b and the current supplied to the connecting wire 41 shown in FIG. 5 are out of phase with each other. The crossover wire 41 passes the radial direction outer side of the part extended upwards from the coil 40b of the lead wire 42b.

As shown in FIGS. 2 to 4, the support member 31 is disposed on the upper side of the stator core 20, the insulator 50 and the coil 40. The material of the support member 31 is an insulating material such as a resin. In the present embodiment, the support member 31 is made of resin. As shown in FIGS. 3 to 5, the support member 31 has a main body portion 33 and a bus bar terminal holding portion 32.

The main body 33 is in the form of a plate whose plate surface faces in the axial direction. The main body 33 has an annular shape centered on the central axis J. The main body 33 is disposed inside the housing 11. The main body portion 33 is supported and fixed to the insulator 50 from the lower side.

The main body 33 has a through hole 31 m and a hole 33 c. That is, the support member 31 has a through hole 31 m and a hole 33 c. The support member 31 may not have the hole 33c. The through hole 31 m penetrates the main body 33 in the axial direction. That is, the through holes 31 m penetrate the support member 31 in the axial direction. The lead wire 42b is passed through the through hole 31m. The lead wire 42 b is drawn to the upper side of the support member 31 through the through hole 31 m. The through hole 31 m also has a function as a lightening hole of the main body 33, for example. By providing the through holes 31 m, the amount of material used for the main body 33 can be reduced, and weight reduction, material cost reduction, etc. can be performed.

In the present embodiment, the through holes 31m extend in the circumferential direction. The circumferential length of the through hole 31m is larger than the radial length of the through hole 31m. As shown in FIG. 5, when viewed from the axial direction, the through holes 31 m have an arc shape extending in the circumferential direction. According to the present embodiment, since the through holes 31m are largely opened in the circumferential direction, the lead wires 42b can be easily pulled out above the support member 31 through the through holes 31m. Further, since the radial length of the through hole 31m can be kept small, the outer diameter of the main body 33 can be made small, and the stator 10 can be made compact.

As shown in FIG. 5, when viewed from the axial direction, the through hole 31 m overlaps a part of the coil 40 b. Specifically, when viewed from the axial direction, the through hole 31m overlaps a portion of the coil 40b from which the lead wire 42b is drawn from the coil 40b. In the example shown in FIG. 5, when viewed from the axial direction, the portion from which the lead wire 42 b is drawn from the coil 40 b is located at an intermediate portion between both ends in the circumferential direction of the through hole 31 m. According to the present embodiment, the lead wire 42 b can be easily pulled out by the upper side of the support member 31 through the through hole 31 m.

As shown in FIGS. 4 and 5, at least the upper end portion of the inner peripheral surface (inner side surface and inner edge) of the through hole 31m is directed to the outside of the through hole 31m in the direction perpendicular to the central axis J toward the upper side. Extend. In the example of the present embodiment, a portion other than the lower end portion in the inner peripheral surface of the through hole 31m extends outward of the through hole 31m in the direction perpendicular to the central axis J as it goes upward. In the present embodiment, at least the upper end portion of the inner peripheral surface of the through hole 31m has a convex curve shape in cross section along the axial direction. That is, a curved surface is provided at the upper end portion of the inner peripheral surface of the through hole 31m. At least the upper end portion of the inner peripheral surface of the through hole 31m has a convex curved surface. The upper end portion of the inner peripheral surface of the through hole 31m may have a tapered surface instead of the curved surface. That is, the upper end portion of the inner peripheral surface of the through hole 31m may be chamfered. The chamfered shape does not mean the manufacturing method, but means the shape (configuration) of the upper end portion of the inner peripheral surface of the through hole 31m. Further, the inner circumferential surface of the through hole 31m may have both the curved surface and the tapered surface described above. The opening area of the cross section perpendicular to the central axis J of the through hole 31m becomes larger toward the upper side. According to the present embodiment, even if the lead wire 42b contacts the upper end portion of the inner peripheral surface of the through hole 31m, bending or scratching of the lead wire 42b is suppressed. When the lead wire 42b is drawn through the through hole 31m, application of excessive stress to the lead wire 42b is suppressed, and breakage of the lead wire 42b or the like is suppressed.

As shown in FIG. 5, at least one recess 31 n is provided on the inner peripheral surface of the through hole 31 m when viewed from the axial direction. When viewed from the axial direction, the recess 31 n is recessed toward the outside of the through hole 31 m on the inner peripheral surface of the through hole 31 m. The lead wire 42b passes through the inside of the recess 31n. Part of the lead wire 42b is accommodated in the recess 31n, and is led to the side where the bus bar terminal 43 is located on the upper side of the support member 31 (in the present embodiment, one side in the circumferential direction). According to the present embodiment, the lead wire 42b can be easily drawn to the bus bar terminal 43 located on the upper side of the support member 31 by passing the lead wire 42b through the recess 31n of the through hole 31m at the time of manufacturing the stator 10. . That is, the lead wire 42b is drawn around toward the bus bar terminal 43 without difficulty by being guided by the recess 31n. For this reason, application of a large tension to the lead wire 42b can be suppressed. The lead wire 42 b is easily connected to the bus bar terminal 43. Since the lead wire 42b is stably connected to the bus bar terminal 43, the length of the lead wire 42b can be shortened.

In the present embodiment, as shown in FIG. 5, the recess 31 n is recessed toward the bus bar terminal 43 on the inner peripheral surface of the through hole 31 m. Therefore, the lead wire 42 b can be easily connected to the bus bar terminal 43. As viewed from the axial direction, the recess 31 n is disposed at one end of the through hole 31 m in the circumferential direction. Recesses 31 n are recessed on one side in the circumferential direction on the inner peripheral surface of through hole 31 m, and bus bar terminals 43 are arranged on one side in the circumferential direction of through hole 31 m. When viewed from the axial direction, the bus bar terminal 43 is located on a virtual line (virtual extension line not shown) in the direction in which the recess 31 n is recessed. According to the present embodiment, the bus bar terminal 43 to which the lead wire 42b is connected is disposed at a circumferential position different from the circumferential position of the through hole 31m, and the dimension of the main body 33 in the radial direction is reduced. The above-mentioned effect is obtained. Also, the bus bar terminal 43 is positioned on a virtual extension of the direction in which the recess 31 n is recessed. Therefore, when the lead wire 42b is pulled through the recess 31n, the lead wire 42b can be guided to a desired position. The desired position in the present embodiment is a position where the bus bar terminal 43 is disposed. As a result, the lead wire 42b can be easily led to the bus bar terminal 43, and the number of assembling steps and the time required for assembling the stator 10 can be reduced.

When viewed from the axial direction, the recess 31 n is curved or V-shaped, and in the example of the present embodiment is V-shaped. That is, when viewed from the axial direction, the width of the recess 31 n decreases toward the outside of the through hole 31 m. In the example of the present embodiment, the radial position of the most recessed portion of the concave portion 31 n is a substantially central portion in the radial direction of the through hole 31 m. According to the present embodiment, in the recess 31 n, the lead wire 42 b can be easily guided to a predetermined position. That is, the lead wire 42b can be stably disposed in a part of the recess 31n. Therefore, it is easier to connect the lead wire 42 b to the bus bar terminal 43. Further, in the present embodiment, the lead wire 42b contacts the inner peripheral surface of the recess 31n. According to the present embodiment, the lead wire 42b can be easily routed by being hooked on the inner peripheral surface of the recess 31n and being bent.

As shown in FIGS. 4 and 5, in the present embodiment, the crossover 41 is disposed below the support member 31, and the lead wire 42 b has a portion disposed above the support 31. In addition, the radial distance between the lead wire 42b and the crossover 41 is stably ensured by passing through the recess 31n. According to the present embodiment, the lead wire 42 b and the crossover 41 are disposed on the same side in the axial direction of the stator core 20 (the upper side of the stator core 20 in the present embodiment). Contact is suppressed. In the present embodiment, the phase of the current flowing through the lead wire 42b is different from the phase of the current flowing through the connecting wire 41. According to the present embodiment, a short circuit between the lead wire 42 b and the connecting wire 41 can be suppressed.

As shown in FIG. 3, the hole 33 c penetrates the main body 33 in the axial direction. The holes 33c extend in the circumferential direction. A plurality of holes 33c are provided at intervals in the circumferential direction. The hole 33 c has, for example, a function as a lightening hole of the main body 33. By providing the holes 33c, the amount of material used in the main body 33 can be reduced, and weight reduction, material cost reduction, and the like can be performed. The lead wire 42 is passed through at least one hole 33 c of the plurality of holes 33 c.

The bus bar terminal holding portion 32 extends upward from the main body portion 33. A plurality of bus bar terminal holding portions 32 are provided along the circumferential direction. In the present embodiment, three bus bar terminal holding portions 32 are provided. The bus bar terminal holding portion 32 holds the bus bar terminal 43. The bus bar terminal holding portion 32 has a tubular shape extending in the axial direction, and holds the bus bar terminal 43 inside. According to the present embodiment, the bus bar terminal 43 can be easily held by the bus bar terminal holding portion 32. The bus bar terminal holding portion 32 extends to the upper side than the lid portion 12 through the window hole 17 and protrudes to the outside of the housing 11.

As shown in FIGS. 3 to 5, the bus bar terminal 43 is supported by the support member 31 and connected to the lead wire 42. That is, the bus bar terminal 43 is connected to the coil 40. The bus bar terminal 43 is a conductive member. In the present embodiment, the bus bar terminals 43 are made of metal such as copper and silver. The bus bar terminal 43 protrudes from the inside of the housing 11 to the outside of the housing 11 through the window hole 17. The bus bar terminal 43 has a conductive portion 43 b and a connection portion 43 a.

The conduction portion 43 b is in the form of a plate whose plate surface faces in the radial direction, and extends in the axial direction. Conducting portion 43 b is inserted into and held by bus bar terminal holding portion 32. Conducting portion 43 b protrudes upward relative to bus bar terminal holding portion 32. The conduction portion 43 b is connected to an external device such as a control device of the motor 1. The conductive portion 43 b can be connected to, for example, a control substrate or an external power supply.

The connecting portion 43a is connected to the lower end of the conducting portion 43b. The connection portion 43a protrudes to one side in the radial direction more than the conduction portion 43b. In the example of the present embodiment, the connection portion 43 a protrudes radially inward of the conduction portion 43 b. The connection portion 43 a is connected to the lead wire 42. Thus, the bus bar terminal 43 is electrically connected to the coil 40. In the example of the present embodiment, two lead wires 42 are connected to the connection portion 43a. The two lead wires 42 are arranged axially in line with each other.

At least a part of the connection portion 43 a is disposed so as to protrude radially inward with respect to a surface of the bus bar terminal holding portion 32 facing inward in the radial direction. Specifically, at least a portion of the connection portion 43 a connected to the lead wire 42 is disposed radially inward of a surface of the bus bar terminal holding portion 32 facing inward in the radial direction. According to the present embodiment, it is possible to suppress the difficulty in drawing the lead wire 42 in the vicinity of the bus bar terminal holding portion 32, and the connection portion 43a and the lead wire 42 can be easily connected. In the present embodiment, the connection portion 43a and the lead wire 42 are welded.

In the present embodiment, although not shown in the drawings, in the vertical cross section including the central axis J, the connection portion 43a has a substantially U shape opening upward. Connection portion 43 a includes a portion of bus bar terminal 43 that is curved in a U-shape. The connection portion 43a is formed by bending a part of the plate member into a U-shape. The lead wire 42 is inserted into the connection portion 43a.

As shown in FIG. 5, when viewed from the axial direction, the radial position of the connection portion 43 a is different from the radial position of the most recessed portion of the concave portion 31 n. In the present embodiment, the radial position of the connection portion 43a is disposed radially inward of the radial position of the most recessed portion of the recess 31n. According to this embodiment, disconnection of the lead wire 42b can be suppressed, and the load acting on the connection portion 43a can be suppressed. Specifically, for example, when the radial position of the connection portion 43a is the same as the radial position of the most depressed portion of the recess 31n, the lead wire 42b is the shortest between the recess 31n and the connection portion 43a. It is conceivable to extend linearly with distance. In this case, when an external force or the like is applied to the bus bar terminal 43 or the like, tension may be directly applied to the lead wire 42b, and the lead wire 42b may be broken or a large load may be applied to the connection portion 43a. On the other hand, according to the present embodiment, when an external force or the like is applied to the bus bar terminal 43 or the like, direct application of tension to the lead wire 42b can be suppressed, and a large load acts on the connection portion 43a. It is suppressed. More specifically, the lead wire 42b can be slightly curved by shifting the radial position of the most depressed portion of the recess 31n from the radial position of the connection portion 43a. As a result, when an external force or the like is applied to the stator 10, the curved portion of the lead wire 42b bends, and the influence of the external force or the like can be alleviated.

As shown in FIG. 4, the connection portion 43 a has a grooved portion. The grooved portion has an end opening toward the recess 31n. The grooved portion extends along the substantially circumferential direction. According to the present embodiment, the lead wire 42 b can be easily connected to the connection portion 43 a.

The connection portion 43a includes a pair of holding

wall portions

43f and 43g and a connection portion 43h. The holding

wall portions

43f and 43g have a plate shape whose plate surface faces in the radial direction. The holding

wall portions

43f and 43g extend in the axial direction. Of the pair of holding

wall portions

43f and 43g, one holding wall portion 43f is connected to the lower end of the conducting portion 43b. Of the pair of holding

wall portions

43f and 43g, the other holding wall portion 43g is disposed radially inward of the one holding wall portion 43f.

The pair of holding

wall portions

43f and 43g are arranged radially spaced from each other. A gap is provided between the pair of holding

wall portions

43f and 43g. A gap between the pair of holding

wall portions

43 f and 43 g is disposed radially inward of a surface of the bus bar terminal holding portion 32 facing inward in the radial direction. According to this embodiment, the lead wire 42 can be easily passed through the gap between the pair of holding

wall portions

43f and 43g, and the connection portion 43a and the lead wire 42 can be easily connected.

The connecting portion 43h connects lower ends of the pair of holding

wall portions

43f and 43g. The lead wire 42 is disposed between the pair of holding

wall portions

43f and 43g and contacts at least one of the pair of holding

wall portions

43f and 43g and the connecting portion 43h. The lead wire 42 is disposed between the pair of holding

wall portions

43f and 43g in the radial direction, and in the example of the present embodiment, contacts the pair of holding

wall portions

43f and 43g. In this embodiment, the bus bar terminal 43 can be made compact and simple by such a connecting portion 43 a.

As shown in FIG. 3, in the present embodiment, three bus bar terminals 43 are provided along the circumferential direction. The three bus bar terminals 43 are supplied with U-phase, V-phase, and W-phase alternating currents, respectively. Thereby, a three-phase alternating current is supplied to the motor 1 through the three bus bar terminals 43. In the present embodiment, the motor 1 is a three-phase motor. However, the motor 1 is not limited to a three-phase motor, and may be a single-phase motor, a two-phase motor, or a four-phase or more multi-phase motor. In that case, the number of bus bar terminals 43 may be appropriately changed according to the number of phases of the motor. In addition, the number of coils 40, the number of lead wires 42, and the number of crossovers 41 described above may be changed as appropriate.

The mold resin portion 35 is a member made of resin. As shown in FIG. 2, the mold resin portion 35 has a substantially cylindrical shape extending in the axial direction centering on the central axis J. As shown in FIGS. 1 and 2, the mold resin portion 35 covers at least a portion of the support member 31 and at least a portion of the bus bar terminal 43. According to the present embodiment, the support member 31 and the bus bar terminal 43 are fixed by the mold resin portion 35, and the support state of the bus bar terminal 43 is stabilized.

More specifically, a portion of stator core 20, at least a portion of insulator 50, at least a portion of coil 40, at least a portion of support member 31, and at least a portion of bus bar terminal 43 are embedded in mold resin portion 35. . Therefore, the stator core 20, the insulator 50, the coil 40, the support member 31, and the bus bar terminal 43 can be integrally fixed together by the mold resin portion 35. In addition, the coil 40 can be easily insulated. In the present embodiment, the entire insulator 50 and the entire coil 40 are embedded in the mold resin portion 35.

In the support member 31, the entire portion excluding the upper end surface of the bus bar terminal holding portion 32 is embedded in the mold resin portion 35. The connection portion 43 a of the bus bar terminal 43 is covered by the mold resin portion 35. As a result, the fixed state of the connection portion 43a and the lead wire 42 is stable, and the sealability in the vicinity of the connection portion 43a is enhanced. Further, in the example of the present embodiment, the mold resin portion 35 covers the portion of the bus bar terminal 43 other than the conductive portion 43 b. At least a part of the conductive portion 43 b is exposed from the mold resin portion 35. Specifically, at least the upper end portion of the conductive portion 43 b is exposed from the mold resin portion 35. According to the present embodiment, the mold resin portion 35 secures the sealing property of the portion of the bus bar terminal 43 other than the conductive portion 43 b while securing the conduction of the conductive portion 43 b.

The mold resin portion 35 is manufactured, for example, by insert molding in which molten resin is poured and solidified in a mold in which the stator core 20, the insulator 50, the coil 40, the support member 31, and the bus bar terminal 43 are inserted. The melted resin is poured into one side of the mold in the axial direction. That is, the resin flows around the stator core 20, the insulator 50 and the coil 40, and then reaches around the support member 31 and the bus bar terminal 43.

The mold resin portion 35 has a first annular portion 36, a second annular portion 37, a plurality of columnar portions (not shown), and a bus bar terminal support portion 38. The first annular portion 36 has a substantially annular shape centered on the central axis J. As shown in FIG. 2, the first annular portion 36 is located above the upper surface of the stator core 20. The first annular portion 36 is disposed radially outward of the rotor 80 and surrounds a portion of the rotor 80. The first annular portion 36 surrounds a portion of the shaft 81 and the bearing 25 from the radially outer side. The outer circumferential surface of the first annular portion 36 is disposed radially inward of the outer circumferential surface of the stator core 20. The outer peripheral surface of the first annular portion 36 extends upward from the upper end surface of the core back 21. The inner circumferential surface of the first annular portion 36 is disposed at the same position as the radially inner side surface of the teeth 22 in the radial direction.

The first annular portion 36 is disposed below the lid 12. The entire first annular portion 36 is housed inside the housing 11. The first annular portion 36 covers the window hole 17 from the lower side. Therefore, foreign matter can be prevented from entering the inside of the housing 11 from the outside of the housing 11 through the window hole 17. In the first annular portion 36, a portion of the insulator 50 above the stator core 20, a portion of the coil 40 above the stator core 20, and a portion of the support member 31 disposed inside the housing 11; A portion of the bus bar terminal 43 disposed inside the housing 11 is embedded.

The first annular portion 36 is in contact with the lower surface of the lid portion 12 along one circumferential direction. Specifically, of the upper end of the first annular portion 36, the end outside in the radial direction is the entire circumference in the circumferential direction with respect to the part of the lower surface of the lid 12 located radially outside of the window hole 17. It contacts from the lower side over.

The first annular portion 36 has a first hole 36 a recessed downward from the upper surface of the first annular portion 36. As shown in FIG. 1, the first hole 36 a overlaps the window hole 17 when viewed along the axial direction. Thereby, for example, by inserting a jig into the first hole 36 a from the upper side of the lid 12 through the window hole 17, the stator 10 is positioned in the circumferential direction with respect to the housing 11 while the stator 10 is housing It can be fixed at 11. In the present embodiment, a plurality of first hole portions 36 a are provided along the circumferential direction.

In the present embodiment, the second annular portion 37 is annular with the central axis J as a center. As shown in FIG. 2, the second annular portion 37 is located below the lower surface of the stator core 20. The second annular portion 37 is disposed radially outward of the rotor 80 and surrounds a portion of the rotor 80. The second annular portion 37 surrounds a portion of the shaft 81 and a portion of the bearing 24 from the radially outer side. The outer circumferential surface of the second annular portion 37 is disposed radially inward of the outer circumferential surface of the stator core 20. The outer peripheral surface of the second annular portion 37 extends downward from the lower end surface of the core back 21. The inner circumferential surface of the second annular portion 37 is disposed at the same position as the radially inner side surface of the teeth 22 in the radial direction.

The lower end of the second annular portion 37 protrudes from the lower opening of the cylindrical portion 13 below the housing 11. A bearing 24 is fitted and held inside the lower end of the second annular portion 37. In the second annular portion 37, a portion of the insulator 50 below the stator core 20 and a portion of the coil 40 below the stator core 20 are embedded.

The plurality of columnar parts are columnar parts extending in the axial direction. Although not shown, the plurality of columnar parts are arranged at equal intervals along the circumferential direction. The plurality of columnar portions are disposed in portions between the teeth 22 adjacent to each other in the circumferential direction. Each columnar portion is filled between the teeth 22 adjacent in the circumferential direction. The upper end of the columnar portion is connected to the first annular portion 36. The lower end of the columnar portion is connected to the second annular portion 37. The columnar portion connects the first annular portion 36 and the second annular portion 37. The radially inner side surface of the columnar portion is disposed at the same position as the radially inner side surface of the tooth 22 in the radial direction.

The inner circumferential surface of the first annular portion 36, the inner circumferential surface of the second annular portion 37, the radially inner side surface of each columnar portion, and the radially inner side surface of each tooth 22 have the same radial position. It forms a cylindrical curved surface centered on the central axis J.

As shown in FIG. 1, the bus bar terminal support portion 38 has a columnar shape that protrudes upward from the first annular portion 36. The upper surface of the bus bar terminal support 38 is in the form of a flat surface extending in the direction perpendicular to the central axis J. The axial position of the upper surface of the bus bar terminal support portion 38 is the same as the axial position of the upper end surface of the bus bar terminal holding portion 32. The upper end surface of the bus bar terminal holding portion 32 is exposed to the outside on the upper surface of the bus bar terminal support portion 38.

When viewed along the axial direction, the bus bar terminal support 38 extends in an arc shape along the circumferential direction. The side surfaces on both sides in the circumferential direction of the bus bar terminal support portion 38 are inclined in a direction approaching each other in the circumferential direction toward the upper side. The circumferential dimension of the bus bar terminal support portion 38 becomes smaller toward the upper side. Thereby, for example, when molding the bus bar terminal support portion 38 by injection molding, the mold can be easily removed. The circumferential dimension of the bus bar terminal support portion 38 is smaller than the circumferential dimension of the window hole 17.

A plurality of bus bar terminal support portions 38 are provided along the circumferential direction. In the present embodiment, three bus bar terminal support portions 38 are provided along the circumferential direction. At least a part of the bus bar terminal 43 is embedded in and supported by the bus bar terminal support portion 38. The lower portion of the bus bar terminal 43 and the upper portion of the bus bar terminal holding portion 32 are embedded in the bus bar terminal support portion 38. The upper end of the bus bar terminal 43 projects upward from the bus bar terminal support 38. Thus, when the external device is disposed on the upper side of the motor 1, the external device can be easily connected to the bus bar terminal 43.

At least a portion of the bus bar terminal support 38 is inserted into the window hole 17. In the present embodiment, the bus bar terminal support portion 38 protrudes above the lid 12 through the window hole 17 from the first annular portion 36. When viewed in the axial direction, the outer edge of the bus bar terminal support 38 is disposed with a gap inside the inner edge of the window hole 17 over the entire circumference. Therefore, when the bus bar terminal support portion 38 is passed through the window hole 17, contact of the bus bar terminal support portion 38 with the inner edge of the window hole 17 can be suppressed, and distortion of the shape of the lid portion 12 can be suppressed. Further, the bus bar terminal support portion 38 can be prevented from being damaged by coming into contact with the inner edge of the window hole 17. The outer edge of the bus bar terminal support 38 may be in contact with the inner edge of the window hole 17.

In the present embodiment, the housing 11 has a bearing holding portion 14 connected to the radially inner edge portion of the lid 12. In the present embodiment, since distortion of the lid 12 can be suppressed as described above, distortion of the bearing holding portion 14 connected to the lid 12 can be suppressed. Therefore, it can suppress that the arrangement | positioning precision of the bearing 25 and the shaft 81 falls.

Among the plurality of bus bar terminal support portions 38, one bus bar terminal support portion 38 has a second hole 39 recessed downward from the upper surface of the bus bar terminal support portion 38. The second hole 39 can be used, for example, for positioning the stator 10 in the circumferential direction, attaching the external device to the bus bar terminal support 38, and the like.

In the process of fixing the stator 10 to the housing 11, an operator, an assembly device or the like (hereinafter, an operator or the like) press-fits the stator 10 into the housing 11 from the lower opening of the cylindrical portion 13. The worker or the like moves the stator 10 upward with respect to the housing 11 until the first annular portion 36 contacts the lower surface of the lid 12. Thereby, the stator 10 is fixed to the housing 11 by press fitting.

The present invention is not limited to the above-described embodiment. For example, as described below, changes in configuration and the like are possible without departing from the spirit of the present invention.

In the above-mentioned embodiment, although the example in which the connecting object to which the lead wire 42 b is connected on the upper side of the support member 31 is the bus bar terminal 43 has been described, the connecting object may be a member other than the bus bar terminal 43.

Although the support member 31 mentioned the example which has one through-hole 31m in the above-mentioned embodiment, it is not limited to this. The support member 31 may have a plurality of through holes 31m. Also according to this, a plurality of lead wires 42b including lead wires of other conductive wires may be arranged in the stator 10 as described above. That is, the lead wire 42b of each conducting wire may be passed through the plurality of through holes 31m.

The arrangement, the shape, and the like of the recess 31 n in the through hole 31 m are not limited to the example described in the above embodiment. In the above-mentioned embodiment, although the example in which the recess 31 n is disposed at the end on one side in the circumferential direction of the through hole 31 m has been described, it is not limited thereto. The recess 31 n may be disposed at the other end of the through hole 31 m in the circumferential direction. The recess 31 n may be disposed at the radially inner end of the through hole 31 m. The recess 31 n may be disposed at the radially outer end of the through hole 31 m.

The through holes 31m may be modified as shown in FIGS. 6 to 10, illustration of the lead wire 42b passing through the inside of the recess 31n is omitted. 6 to 10, the left side in the figure corresponds to one side in the circumferential direction, the right side in the figure corresponds to the other side in the circumferential direction, the upper side in the figure corresponds to the inner side in the radial direction, and the lower side in the figure Corresponds to the radially outer side.

FIG. 6 is a plan view showing a first modification of the through hole 31m. As shown in FIG. 6, the recess 31 n may be recessed on one side in the circumferential direction on the inner circumferential surface of the through hole 31 m and disposed at the radially inner end of the through hole 31 m. That is, when viewed from the axial direction, the recess 31 n may be formed on the radially inner side of the opening (inner peripheral surface) of the through hole 31 m. In this modification, the width of the recess 31 n is substantially constant from the end of the recess 31 n opening to the inside of the through hole 31 m and the most recessed portion of the recess 31 n when viewed from the axial direction. FIG. 7 is a plan view showing a second modification of the through hole 31m. As shown in FIG. 7, the recess 31 n may be recessed on one side in the circumferential direction on the inner peripheral surface of the through hole 31 m and disposed at the radially outer end of the through hole 31 m. That is, when viewed from the axial direction, the recess 31 n may be formed on the radially outer side of the opening of the through hole 31 m. Although not shown in FIGS. 6 and 7, a plurality of recesses 31n are provided on the inner peripheral surface of through hole 31m, and are recessed on one side in the circumferential direction on the inner peripheral surface of through hole 31m. It may be disposed at the radially inner end and the radially outer end, respectively.

According to the above-described modification, the lead wire 42b can be easily routed toward the connection target. Specifically, for example, when the radial position of the connection object is positioned radially inward of the radial position of the through hole 31m, etc., the concave portion 31n is disposed at the radial inner end of the through hole 31m. The lead wire 42b passing through the inside of the recess 31n can be easily routed toward the connection target. Further, for example, when the radial position of the connection object is located radially outside the radial position of the through hole 31m, the concave portion 31n is disposed at the radial outer end of the through hole 31m. The lead wire 42b passing through the inside of 31n can be easily routed to the connection object. In addition, for example, in the case where a plurality of lead wires 42b pass through one through hole 31m, the lead wires 42b can be arranged without contacting each other. In addition, when assembling the stator 10, the recess 31n can be used to support a jig or the like. In addition, even in another stator (other types of stators) in which the position of the lead wire 42b and the position of the connection portion 43a are different from those of the stator 10, the support member 31 is newly designed to form a mold and the like. The support member 31 can be diverted as it is.

FIG. 8 is a plan view showing a third modification of the through hole 31m. As shown in FIG. 8, the recess 31 n is recessed on one side in the circumferential direction on the inner peripheral surface of the through hole 31 m, and is located between the radially inner end and the radially outer end of the through hole 31 m. It may be arranged in a department. According to the above-described modification, the lead wire 42b can be easily routed toward the connection target. Specifically, for example, in the case where the radial position of the connection object is the same as the radial position of the through hole 31m, etc., the recess 31n is disposed at the radial intermediate portion of the through hole 31m. The line 42b can be easily routed toward the connection object.

FIG. 9 is a plan view showing a fourth modification of the through hole 31m. As shown in FIG. 9, the recess 31 n is one of an end on one side in the circumferential direction, an end on the other side in the circumferential direction, an end on the inner side in the radial direction and an end on the outer side in the radial direction , May be provided at at least two or more ends. In the illustrated example, the recess 31 n is provided at one end in the circumferential direction on the inner peripheral surface of the through hole 31 m, the other end in the circumferential direction, the radially inner end and the radially outer end. . According to the above-mentioned modification, it is possible to select and use the most suitable recess 31 n from among the plurality of recesses 31 n toward the connection object to which the lead wire 42 b is connected. Even when the position of the lead wire 42b is changed, the lead wire 42b is pulled out in a desired direction by changing the recess 31n for passing the lead wire 42b to another recess 31n without replacing the support member 31. Can. Moreover, the support member 31 can be diverted to another stator different from the stator 10, and parts can be made common. Also, a plurality of lead wires 42b can be drawn out from within one through hole 31m, and each drawn lead wire 42b can be turned around in a desired direction.

FIG. 10 is a plan view showing a fifth modification of the through hole 31m. As shown in FIG. 10, the support member 31 may have a partition 31o that divides the inside of the through hole 31m into a plurality of spaces. Recesses 31 n are disposed in a plurality of spaces inside the through holes 31 m. The material of the partition part 31o is, for example, an insulating material such as a resin. In addition, the partition part 31o and the main-body part 33 may be a single member, and may be mutually different members. That is, the inside of one through hole 31m may be divided into a plurality of parts by a member or a part serving as a partition and partitioned, and a recess 31n may be provided for each part divided in the opening of the through hole 31m. According to the above-mentioned modification, when drawing out a plurality of leader lines 42b from inside of one penetration hole 31m, contact of leader lines 42b can be controlled more.

Of the inner wall constituting the opening of the through hole 31m as viewed from the axial direction, the portion constituting the recess 31n may be a curved surface or may be a flat surface. Further, when viewed from the axial direction, the recess 31 n may have a slit shape. The recess 31 n may have a shape other than the above-described shape, and the outer shape of the recess 31 n is not particularly limited.

In the above-mentioned embodiment, although the lead wire which constitutes coil 40b which has lead wire 42b differs from the lead wire which constitutes one coil 40 and the other coil 40 which are connected by crossover 41, this gave an example. It is not limited to. The conducting wire which comprises the coil 40b which has the lead-out wire 42b may be the same as the conducting wire which comprises one coil 40 and the other coil 40 which are connected by the connecting wire 41. Also in this case, according to the present embodiment, the contact between the lead wire 42b and the crossover wire 41 is suppressed, and the motor 1 can be easily assembled.

In the above embodiment, in the description of the bus bar terminal 43, one radial side is the radial inner side. However, the present invention is not limited to this. The radial one side may be the radial outer side.

Although the example which exposed at least one part of conduction part 43b from mold resin part 35 was mentioned in the above-mentioned embodiment, the whole bus bar terminal 43 may be covered with mold resin part 35.

The application of the motor of the embodiment described above is not particularly limited. The motor of the embodiment described above can be used in various devices such as a pump, a brake, a clutch, a vacuum cleaner, a dryer, a ceiling fan, a washing machine, a refrigerator and an electric power steering device.

In addition, without departing from the spirit of the present invention, each configuration (component) described in the above-described embodiment, modification, and note may be combined, and addition, omission, replacement, and other configurations can be made. Changes are possible. Moreover, this invention is not limited by embodiment mentioned above, It is limited only by the claim.

DESCRIPTION OF SYMBOLS 1 ... Motor, 10 ... Stator, 20 ... Stator core, 31 ... Support member, 31m ... Through hole, 31n ... Concave part, 31o ... Partition part, 40b (40) ... Coil, 42b (42) ... Lead wire, 43 ... Bus-bar terminal , 43a ... connection portion, 80 ... rotor, J ... central axis

Claims

An annular stator core centered on the central axis,

A support member disposed on one side in the axial direction of the stator core;

And a coil attached to the stator core,

The coil has a lead wire extending to one axial side of the support member,

The support member has a through hole axially penetrating the support member and through which the lead wire passes.

Viewed from the axial direction, at least one recess is provided on the inner circumferential surface of the through hole,

The stator leads through the inside of the recess.
The stator according to claim 1, wherein

A bus bar terminal supported by the support member and connected to the lead wire;

The stator, wherein the recess is recessed toward the bus bar terminal on an inner circumferential surface of the through hole.
The stator according to claim 2, wherein

The recessed portion is recessed on one side in the circumferential direction on the inner peripheral surface of the through hole,

The stator, wherein the bus bar terminal is disposed on one side in the circumferential direction of the through hole.
The stator according to claim 3, wherein

The bus bar terminal has a connection portion connected to the lead wire,

Seen from the axial direction, the radial position of the connection is different from the radial position of the most recessed portion of the recess.
The stator according to claim 2 or 3, wherein

The bus bar terminal has a connection portion connected to the lead wire,

The connection portion has a groove-like portion,

The stator, wherein the grooved portion has an end opening toward the recess.
The stator according to any one of claims 1 to 5, wherein

The stator, wherein the lead wire contacts an inner circumferential surface of the recess.
The stator according to any one of claims 1 to 6, wherein

A stator, viewed in the axial direction, wherein the recess is curved or V-shaped.
The stator according to any one of claims 1 to 7, wherein

The stator is recessed on one side in the circumferential direction on the inner peripheral surface of the through hole, and is disposed at a radially inner end or a radially outer end of the through hole.
The stator according to any one of claims 1 to 7, wherein

The stator is recessed on one side in the circumferential direction on the inner peripheral surface of the through hole, and is disposed in a radially intermediate portion located between the radially inner end and the radially outer end of the through hole. .
The stator according to any one of claims 1 to 9, wherein

The recess is at least two or more of an end on one circumferential side of the inner circumferential surface of the through hole, an end on the other circumferential side, a radial inner end and a radial outer end. Stator provided at the end.
The stator according to claim 10, wherein

The support member has a partition that divides the inside of the through hole into a plurality of spaces,

The stator, wherein the recess is disposed in each of the plurality of spaces.
The stator according to any one of claims 1 to 11, wherein

A stator, wherein at least one end of the inner peripheral surface of the through hole in the axial direction extends outward of the through hole in a direction perpendicular to the central axis as it goes to one side in the axial direction.
The stator according to any one of claims 1 to 12.

A motor rotatable about the central axis with respect to the stator.