CN112583170A

CN112583170A - Bus bar device, stator, and motor

Info

Publication number: CN112583170A
Application number: CN202011020817.7A
Authority: CN
Inventors: 石田尚
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-09-30
Filing date: 2020-09-25
Publication date: 2021-03-30
Also published as: JP2021058011A

Abstract

The invention provides a bus bar device, a stator and a motor, wherein the bus bar device is used for the stator taking a central axis as a center, and comprises a bus bar and a resin part embedded with at least one part of the bus bar. The resin part has: a main body portion extending in a circumferential direction; and a coil holding portion that protrudes in the radial direction from the main body portion and holds a coil end of a coil included in the stator. The bus bar has a 1 st connection terminal exposed in a radial direction from the body portion. The coil end is opposed to the 1 st connection terminal.

Description

Bus bar device, stator, and motor

Technical Field

The invention relates to a bus bar device, a stator and a motor.

Background

The motor has a rotor and a stator. The stator has a stator core, an insulator, a coil, and a bus bar arrangement. The rotating electric machine described in patent document 1 includes a bus bar unit. The bus bar unit includes an insulating block and a plurality of bus bars in which a main body portion is arranged inside the insulating block. The connection terminal of each bus bar protrudes from the outer peripheral surface of the insulating block. The coil end of the stator coil is fixed to the connection terminal by welding.

Patent document 1: japanese laid-open patent publication No. 2017-208871

In the conventional bus bar device, it is difficult to align the connection terminal of the bus bar with the coil end of the coil.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a bus bar device, a stator, and a motor that are easy to assemble.

One aspect of the present invention is a bus bar device for a stator centered on a central axis, the bus bar device including a bus bar and a resin portion in which at least a part of the bus bar is embedded. The resin part has: a main body portion extending in a circumferential direction; and a coil holding portion that protrudes in the radial direction from the main body portion and holds a coil end of a coil included in the stator. The bus bar has a 1 st connection terminal exposed in a radial direction from the body portion. The coil end is opposed to the 1 st connection terminal.

A stator according to one embodiment of the present invention includes: a cylindrical stator core extending in an axial direction; an insulator mounted to the stator core; a coil attached to the stator core with the insulator interposed therebetween; and the bus bar device.

A motor according to one embodiment of the present invention includes: a rotor centered on the central axis; and the stator disposed radially outside the rotor.

According to the bus bar device, the stator, and the motor of one embodiment of the present invention, assembly is easy.

Drawings

Fig. 1 is a sectional view schematically showing a motor according to an embodiment.

Fig. 2 is a perspective view showing a stator of an embodiment.

Fig. 3 is a plan view showing a stator of an embodiment.

Fig. 4 is a perspective view showing a part of a stator of an embodiment.

Fig. 5 is a perspective view illustrating a bus bar of the bus bar device of one embodiment.

Fig. 6 is a perspective view showing a part of a stator of an embodiment.

Fig. 7 is a perspective view showing a part of a stator according to a modification of the embodiment.

Fig. 8 is a perspective view illustrating a part of an insulator (insulator portion) and a neutral point bus bar of a stator of one embodiment.

Fig. 9 is a perspective view illustrating a part of an insulator, a neutral point bus bar, and a coil end of a coil of a stator according to an embodiment.

Description of the reference symbols

1: a motor; 20: a rotor; 30: a stator; 31: a stator core; 32: an insulating member; 33: a coil; 33 a: a coil end; 36: a bus bar device; 37: a bus bar; 37 a: 1 st connecting terminal; 37 b: a 2 nd connection terminal; 38: a resin part; 40 h: an end face; 41: a protrusion; 41 c: a front end portion; 41 d: a moiety; 42: a main body portion; 43: a coil holding portion; 43 a: the end of the coil is closed; 43 b: 1 st holding part; 43 c: the 2 nd holding part; 43 d: a locking protrusion; 44: an installation part; 44 a: a through hole; 45: a support portion; j: a central axis.

Detailed Description

As shown in fig. 1, in the present embodiment, the direction in which the central axis J of the motor 1 extends is simply referred to as "axial direction". In the present embodiment, the axial direction is the vertical direction. The upper side (+ Z) corresponds to one axial side, and the lower side (-Z) corresponds to the other axial side. The radial direction about the central axis J is simply referred to as the "radial direction", and the circumferential direction about the central axis J is simply referred to as the "circumferential direction". As shown in fig. 3, when viewed in the axial direction, a predetermined rotational direction in the circumferential direction is referred to as a circumferential one side θ 1, and a rotational direction opposite to the predetermined rotational direction is referred to as a circumferential other side θ 2. In the present embodiment, the counterclockwise direction about the central axis J corresponds to one circumferential side θ 1 and the clockwise direction about the central axis J corresponds to the other circumferential side θ 2 in a plan view of the motor 1. The vertical direction, the upper side, and the lower side are only names for describing relative positional relationships of the respective portions, and the actual positional relationship and the like may be positional relationships other than the positional relationships indicated by these names and the like.

The motor 1 of the present embodiment is mounted on, for example, an electric power steering apparatus (not shown). The electric power steering apparatus is mounted on a steering mechanism of a wheel of an automobile. An electric power steering apparatus is an apparatus for reducing a steering force by a motor.

As shown in fig. 1, a motor 1 of the present embodiment includes: a rotor 20 centered on the central axis J; a stator 30 disposed radially outward of the rotor 20; a housing 11; and a plurality of

bearings

15, 16. The motor 1 is an inner rotor type motor. The rotor 20 rotates about the central axis J with respect to the stator 30.

The housing 11 houses the rotor 20 and the stator 30. The housing 11 has a cylindrical shape extending in the axial direction. The housing 11 has a peripheral wall 11a, a top wall 11b, a bottom wall 11c, and a bearing holding wall 11 d. The peripheral wall portion 11a is cylindrical and extends in the axial direction. The top wall portion 11b closes the opening on the upper side of the peripheral wall portion 11 a. The bottom wall portion 11c closes the opening on the lower side of the peripheral wall portion 11 a. The bottom wall 11c holds the bearing 16. The bearing holding wall 11d is fixed to the inner peripheral surface of the peripheral wall 11 a. The bearing holding wall 11d holds the bearing 15.

Rotor 20 includes shaft 21, rotor core 22, and magnet 23. The shaft 21 has a cylindrical shape extending in the axial direction. The shaft 21 may have a cylindrical shape extending in the axial direction. The shaft 21 is supported by the plurality of

bearings

15 and 16 to be rotatable about the center axis J. The plurality of

bearings

15, 16 are arranged at intervals in the axial direction and supported by the housing 11. That is, the shaft 21 is supported by the housing 11 via the plurality of

bearings

15 and 16.

Rotor core 22 has a cylindrical shape extending in the axial direction. Rotor core 22 has an outer diameter larger than that of shaft 21. The length of rotor core 22 in the axial direction is smaller than the length of shaft 21 in the axial direction. The inner peripheral surface of rotor core 22 is fixed to the outer peripheral surface of shaft 21. Rotor core 22 is fixed to shaft 21 by press-fitting, bonding, or the like. The rotor core 22 is located between the pair of

bearings

15, 16 in the axial direction. Magnet 23 is fixed to the outer periphery of rotor core 22.

The stator 30 is opposed to the rotor 20 with a gap in the radial direction. The stator 30 surrounds the rotor 20 over the entire circumferential range from the radially outer side in the circumferential direction. As shown in fig. 1 to 3, the stator 30 has a stator core 31, an insulator 32, a coil 33, a bus bar device 36, and a neutral point bus bar 34. That is, the bus bar device 36 is used for the stator 30 centered on the central axis J. In fig. 1, the illustration of the bus bar device 36 and the neutral point bus bar 34 is omitted.

The stator core 31 is annular with the center axis J as the center. The stator core 31 has a cylindrical shape extending in the axial direction. The stator core 31 surrounds the rotor 20 from the radially outer side. The stator core 31 is formed of, for example, a plurality of electromagnetic steel sheets stacked in the axial direction. Stator core 31 is fixed to the inner circumferential surface of housing 11. The stator core 31 and the housing 11 are fixed to each other by, for example, shrink fitting, press fitting, or the like.

The stator core 31 has a core back 31a and a plurality of teeth 31 b. The core back 31a is cylindrical with the center axis J as the center. The radially outer surface of the core back 31a is fixed to the inner peripheral surface of the peripheral wall 11 a. The teeth 31b project radially inward from the radially inner surface of the core back 31 a. The plurality of teeth 31b are arranged at intervals in the circumferential direction. The radially inner surface of each tooth 31b faces the radially outer surface of the rotor 20 with a gap therebetween.

The insulator 32 is attached to the stator core 31. The insulating member 32 is made of an insulating material. The insulator 32 is made of, for example, resin. The insulator 32 has a ring shape centered on the central axis J. The insulator 32 has an upper portion 32a opposed to the plurality of teeth 31b at least from the upper side and a lower portion 32b opposed to the plurality of teeth 31b at least from the lower side. The upper portion 32a is annular with the center axis J as the center. Specifically, the upper portion 32a includes a portion facing each tooth 31b from above and a portion facing each tooth 31b from the circumferential direction. The lower portion 32b is annular with the center axis J as the center. Specifically, the lower portion 32b has a portion facing each tooth 31b from below and a portion facing each tooth 31b from the circumferential direction.

As shown in fig. 2 and 3, the insulator 32 has a plurality of insulator portions 40 arranged in the circumferential direction. The plurality of insulator portions 40 are arranged at equal intervals in the circumferential direction. In the present embodiment, the plurality of insulator portions 40 constitute the upper portion 32a of the insulator 32. The plurality of insulator sections 40 have the same shape as each other. That is, in the present embodiment, the plurality of insulator sections 40, which are common members (common products) of the same kind, are arranged in the circumferential direction, thereby configuring at least the upper portion 32a of the annular insulator 32. In the present embodiment, 12 insulating material portions 40 are provided in a circumferential direction.

As shown in fig. 8 and 9, the insulator 40 includes a winding portion 40a, an inner wall portion 40b, an outer wall portion 40c, a projection 41, a recess 40d, a 1 st end surface 40e, a 2 nd end surface 40f, and a bus bar receiving seat 40 g. That is, the insulator 32 includes a winding portion 40a, an inner wall portion 40b, an outer wall portion 40c, a protrusion 41, a recess 40d, a 1 st end surface 40e, a 2 nd end surface 40f, and a bus bar receiving seat 40 g.

One winding portion 40a is provided for each insulator portion 40. That is, the insulator portion 40 has one winding portion 40 a. The coil 33 is wound around the winding portion 40 a. The winding portion 40a has a U-shape that opens downward when viewed in the radial direction. The winding portion 40a has a portion that contacts the teeth 31b from the upper side, a portion that contacts the teeth 31b from one circumferential side θ 1, and a portion that contacts the teeth 31b from the other circumferential side θ 2.

The inner wall portion 40b is disposed radially inward of the winding portion 40 a. The inner wall portion 40b has a plate shape, and the pair of plate surfaces face in the radial direction. The inner wall portion 40b is connected to the radially inner end of the winding portion 40 a. The inner wall portion 40b has a portion protruding upward from the winding portion 40a, a portion protruding to one circumferential side θ 1 from the winding portion 40a, and a portion protruding to the other circumferential side θ 2 from the winding portion 40 a. That is, the inner wall portion 40b protrudes upward from the winding portion 40 a. The inner wall portion 40b protrudes in the axial direction from the winding portion 40 a.

The outer wall portion 40c is disposed radially outward of the winding portion 40 a. The outer wall portion 40c has a plate shape, and the pair of plate surfaces face in the radial direction. The outer wall portion 40c is connected to a radially outer end of the winding portion 40 a. The outer wall portion 40c has a portion protruding upward from the winding portion 40a, a portion protruding to one side θ 1 in the circumferential direction from the winding portion 40a, and a portion protruding to the other side θ 2 in the circumferential direction from the winding portion 40 a. That is, the outer wall portion 40c protrudes upward from the winding portion 40 a. The outer wall portion 40c protrudes in the axial direction beyond the winding portion 40 a.

The projection 41 is disposed radially outward of the winding portion 40 a. The projection 41 projects upward from the winding portion 40 a. That is, the protrusion 41 protrudes in the axial direction beyond the winding portion 40 a. The projection 41 projects upward from an end surface 40h of the outer wall 40c facing upward. That is, the protrusion 41 protrudes in the axial direction from the end surface 40h of the outer wall portion 40c facing in the axial direction.

A plurality of projections 41 are provided on each insulator 40. That is, the insulator portion 40 has a plurality of protrusions 41. The plurality of projections 41 are arranged at intervals in the circumferential direction. In the present embodiment, each insulator portion 40 has two protrusions 41. Therefore, as shown in fig. 2 and 3, three or more projections 41 are provided on the insulator 32 at intervals in the circumferential direction.

As shown in fig. 8 and 9, the plurality of projections 41 include a 1 st projection 41a and a 2 nd projection 41 b. The 1 st projection 41a and the 2 nd projection 41b are arranged at positions different from each other in the circumferential direction. That is, the 2 nd protrusion 41b is arranged at a position different from the 1 st protrusion 41a in the circumferential direction. In the present embodiment, the 1 st projection 41a is connected to the end of the other circumferential side θ 2 of the outer wall 40 c. The 2 nd protrusion 41b is connected to an intermediate portion between both end portions of the outer wall portion 40c in the circumferential direction.

The 1 st projection 41a and the 2 nd projection 41b are arranged at different positions in the radial direction. Specifically, the 1 st projection 41a has a portion located radially outward of the 2 nd projection 41 b. The 2 nd protrusion 41b has a portion located radially inward of the 1 st protrusion 41 a. The radially inner surface of the 1 st projection 41a has a portion located radially outward of the radially outer surface of the 2 nd projection 41 b. The axial position of the 1 st projection 41a and the axial position of the 2 nd projection 41b are the same as each other. Specifically, in the present embodiment, the axial positions of the portion other than the lower end portion of the 2 nd projection 41b and the axial position of the 1 st projection 41a are the same as each other.

The length (width) of the 1 st projection 41a in the circumferential direction is larger than the length of the 2 nd projection 41b in the circumferential direction. The radially inner side surface of the 1 st projection 41a is a flat surface. That is, the radially inner side surface of the projection 41 is a flat surface. Specifically, in the present embodiment, as shown in fig. 3, the radially inner side surface of the 1 st projection 41a is positioned radially outward as it goes toward the one circumferential side θ 1. In other words, the radially inner side surface of the 1 st projection 41a extends radially outward in the circumferential direction toward the 2 nd projection 41b side adjacent to the 1 st projection 41 a. The radially inner surface of the 1 st projection 41a is an inclined surface inclined with respect to a tangent line passing through a part of the circumference of an imaginary circle centered on the central axis J, specifically, a tangent line passing through the radially inner surface of the 1 st projection 41a, as viewed in the axial direction.

As shown in fig. 3, 4, 8, and 9, the radial outer surface of the 2 nd protrusion 41b is a curved surface that protrudes outward in the radial direction. That is, the radially outer surface of the projection 41 is a curved surface that projects radially outward. Specifically, the shape of the cross section perpendicular to the central axis J of the radially outer surface of the 2 nd protrusion 41b is a curved line shape that protrudes outward in the radial direction. In the present embodiment, the shape of the cross section of the radially outer surface of the 2 nd protrusion 41b parallel to the central axis J is a straight line extending in the axial direction. The cross-section of the 2 nd protrusion 41b perpendicular to the central axis J has a non-circular shape. That is, the cross section of the protrusion 41 perpendicular to the central axis J has a non-circular shape. In the present embodiment, the cross-section of the protrusion 41 perpendicular to the central axis J has a shape obtained by replacing one of four sides of a square with a convex arc.

As shown in fig. 8 and 9, the recessed portion 40d is recessed downward from an end surface 40h of the outer wall portion 40c facing upward. That is, the recessed portion 40d is recessed in the axial direction from the end surface 40h of the outer wall portion 40c facing in the axial direction. In the present embodiment, the recessed portion 40d is located at the end portion of the outer wall portion 40c on the one side θ 1 in the circumferential direction. The recess 40d has a U-shape that opens upward when viewed in the radial direction. The recessed portion 40d penetrates the outer wall portion 40c in the radial direction. The length of the recessed portion 40d in the circumferential direction is larger than the wire diameter of the coil end 33a of the coil 33. Therefore, as shown in fig. 9, the coil end 33a can be passed through the recess 40 d. In detail, by inserting the coil end 33a from the upper side of the recessed portion 40d, the coil end 33a can be made to pass through the recessed portion 40d in the radial direction.

In the present embodiment, the coil end 33a of the coil 33 wound around the winding portion 40a can be easily drawn outward in the radial direction of the insulator 32 by passing the coil end 33a through the recessed portion 40 d. According to the present embodiment, by providing the recessed portion 40d, for example, before the bus bar device 36 is attached to the insulator 32, the coil end 33a is drawn out radially outward through the recessed portion 40d, and after the bus bar device 36 is attached to the insulator 32, the coil end 33a is drawn out upward from the recessed portion 40d as shown in fig. 4, whereby the coil end can be easily held by the coil holding portion 43 of the bus bar device 36, which will be described later. As shown in fig. 9, for example, before the neutral point bus bar 34 is attached to the insulator 32, the coil end 33a is led out radially outward through the recessed portion 40d, and after the neutral point bus bar 34 is attached to the insulator 32, the coil end 33a is bent upward, thereby facilitating welding to the radially outer surface of the neutral point bus bar 34. In the present embodiment, the protrusion 41 and the recess 40d are arranged at different positions in the circumferential direction. According to the present embodiment, interference between the protrusion 41 and the recess 40d is suppressed, and the functions of the protrusion 41 and the recess 40d can be stably obtained.

As shown in fig. 8 and 9, the 1 st end surface 40e constitutes a part of the end surface 40 h. The 1 st end surface 40e constitutes a portion of the end surface 40h other than the end portion of the other side θ 2 in the circumferential direction. The 1 st end surface 40e is a plane facing upward. The 1 st end surface 40e is a plane perpendicular to the central axis J. The 2 nd end face 40f constitutes a part of the end face 40 h. The 2 nd end surface 40f constitutes an end portion of the other side θ 2 in the circumferential direction of the end surface 40 h. The 2 nd end surface 40f is a plane facing the upper side. The 2 nd end surface 40f is a plane perpendicular to the central axis J. The 2 nd end surface 40f is located above the 1 st end surface 40 e.

The busbar holder 40g is located at the end face 40 h. The busbar holder 40g is located on the 2 nd end face 40 f. In the present embodiment, the circumferential position of the 1 st projection 41a and the circumferential position of the bus bar holder 40g are the same as each other. That is, the 1 st protrusion 41a and the bus bar support 40g are aligned in the radial direction.

As shown in fig. 1 to 3, the coil 33 is attached to the stator core 31 via an insulator 32. The coil 33 is provided in plurality in a circumferentially aligned manner. The number of coils 33 is the same as the number of insulator sections 40. In the present embodiment, 12 coils 33 are provided in a circumferential direction. Each coil 33 is attached to each tooth 31b via each insulator 40. The coil 33 is formed by winding a conductive wire around the teeth 31b via the winding portion 40a of the insulator 40. As shown in fig. 4 and 9, the coil 33 has a coil end 33 a. The coil end 33a is an end of a lead wire of the coil 33, and may be a lead wire or the like in other words.

The motor 1 of the present embodiment is, for example, a three-phase motor. Three phases are referred to as U phase, V phase and W phase. In the case of a three-phase motor, the coils 33 of the U-phase, V-phase, and W-phase are each formed of any of the 1 st wire, the 2 nd wire, and the 3 rd wire. The coil end 33a of the coil 33 of each phase is connected to a 1 st connection terminal 37a or a neutral point bus bar 34 of the bus bar device 36, which will be described later. Although not particularly shown, in the present embodiment, the coil end 33a of the coil 33 of each phase is fixed to the 1 st connection terminal 37a of the bus bar device 36 or the neutral point bus bar 34 by welding. That is, the 1 st connection terminal 37a and the coil end 33a are soldered. The 1 st connection terminal 37a is connected to the coil 33. The neutral point bus bar 34 and the coil end 33a are welded. The neutral point bus bar 34 is connected to the coil 33.

As shown in fig. 2 to 4, the bus bar device 36 is mounted to the insulator 32. The bus bar arrangement 36 is fixed with the insulator 32. The bus bar device 36 is disposed above the coil 33. The bus bar device 36 has a bus bar 37 and a resin portion 38.

The resin portion 38 is made of resin. The resin portion 38 is produced by insert molding of the bus bar 37 as an insert member. At least a part of the bus bar 37 is embedded in the resin portion 38. The resin portion 38 includes a main body portion 42, a coil holding portion 43, an attachment portion 44, and a support portion 45.

The main body portion 42 extends in the circumferential direction. As shown in fig. 3, the body 42 has an arc shape centered on the central axis J when viewed in the axial direction. In the present embodiment, the body portion 42 extends in the circumferential direction within a range in which the central angle around the central axis J is 90 ° or more and 180 ° or less. Although not particularly shown, the main body 42 has a quadrangular cross section in the radial direction. Specifically, the shape of the cross section of the body portion 42 in the radial direction is a rectangular shape extending in the axial direction.

As shown in fig. 2 and 3, the coil holding portion 43 protrudes radially outward from the body portion 42. That is, the coil holding portion 43 protrudes from the body portion 42 in the radial direction. The coil holding portion 43 holds the coil end 33a of the coil 33. The plurality of coil holding portions 43 are provided at intervals in the circumferential direction. In the present embodiment, six coil holding portions 43 are provided at intervals from each other in the circumferential direction. Two coil holding portions 43 out of the six coil holding portions 43 hold the coil ends 33a of the U-phase coil 33, two other coil holding portions 43 hold the coil ends 33a of the V-phase coil 33, and the remaining two other coil holding portions 43 hold the coil ends 33a of the W-phase coil 33. The structure of the coil holding portion 43 other than the above will be described later.

The mounting portion 44 protrudes radially outward from the body portion 42. That is, the mounting portion 44 protrudes radially from the main body portion 42. The mounting portion 44 is mounted to the insulator 32. The mounting portion 44 is fixed to the insulator 32. The mounting portion 44 has a plate shape extending perpendicular to the central axis J. The lower surface of the mounting portion 44 contacts an upper end surface 40h of the outer wall portion 40 c. That is, the mounting portion 44 contacts the end surface 40h of the insulator 32 facing upward. The mounting portion 44 is supported from below by the end surface 40 h. The mounting portions 44 are provided in plurality at intervals in the circumferential direction. The plurality of mounting portions 44 are arranged at equal intervals in the circumferential direction. In the present embodiment, five mounting portions 44 are provided at intervals from each other in the circumferential direction. Each of the mounting portions 44 is disposed between a pair of circumferentially adjacent coil holding portions 43.

In the present embodiment, since the mounting portion 44 is attached to the insulator 32, the bus bar device 36 is suppressed from being positionally displaced with respect to the insulator 32. Therefore, the bus bar device 36 is suppressed from being positionally displaced with respect to the coil 33 wound on the insulator 32. Since the relative movement of the bus bar 37 and the coil 33 is suppressed, the 1 st connection terminal 37a and the coil end 33a of the bus bar 37, which will be described later, can be easily aligned. Further, the bus bar device 36 can be disposed close to the insulator 32, the coil 33, and the like. The winding of the coil end 33a is facilitated, and the assembly can be simplified, so that the length of the lead coil end 33a can be shortened to reduce the amount of the lead wire of the coil 33. By disposing the bus bar device 36 in a space such as directly above the insulator 32 and the coil 33 and effectively utilizing the space, the motor 1 can be configured compactly in the axial direction. In contrast to the case where a member such as a coil holder that supports a coil end is provided between the bus bar device and the coil, for example, unlike the present embodiment, the number of components can be reduced according to the present embodiment.

As shown in fig. 4, the mounting portion 44 has a through hole 44 a. The through hole 44a axially penetrates the mounting portion 44. The 2 nd protrusions 41b are inserted into the through holes 44a of the mounting portions 44. That is, the protrusion 41 is inserted into the through hole 44 a. According to the present embodiment, the mounting portion 44 and the insulator 32 can be aligned with a simple configuration, and the aligned state can be easily maintained.

The through hole 44a has a non-circular cross section perpendicular to the center axis J. In the present embodiment, the cross-sectional shape of the through-hole 44a perpendicular to the central axis J is a shape obtained by replacing one of four sides of a quadrangle with a convex arc. The shaft-like projection 41 as the 2 nd projection 41b is fitted into the through hole 44 a. According to the present embodiment, the mounting portion 44 and the protrusion 41 inserted into the through hole 44a of the mounting portion 44 are prevented from rotating relative to each other about the axis of the protrusion 41. The mounting portion 44 and the insulator 32 can be stably positioned by a simple configuration.

As shown in fig. 6, in the present embodiment, the attachment portion 44 and the protrusion 41 inserted into the through hole 44a are welded. That is, the mounting portion 44 and the 2 nd protrusion 41b are thermally welded. According to the present embodiment, the mounting portion 44 and the protrusion 41 are fixed by welding. The bus bar device 36 and the insulator 32 are fixed in a positioned state. In each manufacturing process after welding, the bus bar device 36 and the insulator 32 are prevented from being positionally displaced.

The radially outer side of the body 42 is easier to secure a larger working space and easier to visually confirm than the radially inner side of the body 42. In the present embodiment, since the mounting portion 44 protrudes radially outward from the body portion 42, the mounting portion 44 and the protrusion 41 can be welded to each other in the space radially outward of the body portion 42, and the bus bar device 36 can be easily assembled to the insulator 32.

Fig. 7 shows a modification of the present embodiment. In the modification of fig. 7, the protrusion 41 has a retaining structure in place of or in addition to the structure in which the attachment portion 44 and the protrusion 41 are welded. Specifically, the protrusion 41 has a distal end portion 41c protruding upward from the through hole 44a, and the distal end portion 41c has a portion 41d facing the attachment portion 44 from above. In the illustrated example, the portion 41d has a protrusion shape protruding from the outer peripheral surface of the distal end portion 41 c. The protruding amount of the portion 41d from the outer peripheral surface of the distal end portion 41c becomes larger toward the lower side. The lower surface of the portion 41d is in contact with the upper surface of the mounting portion 44 or faces the upper surface with a gap therebetween in the axial direction. Although not shown in the drawings, the portion 41d may be, for example, a flange shape protruding from the outer peripheral surface of the distal end portion 41c and extending around the axis of the distal end portion 41 c. According to the present modification, the mounting portion 44 is sandwiched between the end surface 40h facing the upper side of the insulator 32 and the portion 41d of the distal end portion 41c from both sides in the axial direction. Since the mounting portion 44 is held in the projecting portion 41 of the insulator 32 in a state of being prevented from coming off, the state in which the bus bar device 36 is aligned with the insulator 32 can be stably maintained, and the assembly can be easily performed.

As shown in fig. 3, the support portion 45 protrudes radially inward from the body portion 42. That is, the support portion 45 protrudes from the main body portion 42 in the radial direction. The lower surface of the support portion 45 contacts the upper end surface of the inner wall portion 40 b. That is, the support portion 45 contacts the insulator 32 from above. The support portion 45 is in contact with the insulator 32 from the axial direction. The support portions 45 are provided in plurality at intervals in the circumferential direction. In the present embodiment, three support portions 45 are provided at intervals in the circumferential direction.

As shown in fig. 5, the bus bar 37 has a plate shape. The bus bar 37 is made of a metal and is made of a conductive material. The bus bar 37 is provided in plurality. In the present embodiment, three bus bars 37 are provided. One bus bar 37 of the three bus bars 37 is connected to the coil end 33a of the U-phase coil 33, the other bus bar 37 is connected to the coil end 33a of the V-phase coil 33, and the remaining other bus bar 37 is connected to the coil end 33a of the W-phase coil 33.

The bus bar 37 has a 1 st connecting terminal 37a, a 2 nd connecting terminal 37b, and a coupling portion 37 c. The 1 st connecting terminal 37a is provided with a pair on one bus bar 37. The pair of 1 st connection terminals 37a are arranged at intervals in the circumferential direction. The 2 nd connecting terminal 37b is provided one on one bus bar 37. The connecting portion 37c is provided with one bus bar 37.

The axial positions of at least the upper end portions of the 1 st connecting terminals 37a of the three bus bars 37 are the same as each other. That is, the axial positions of the 1 st connecting terminals 37a of the plurality of bus bars 37 are the same as each other. Among the plurality of bus bars 37, the length of the 1 st connection terminal 37a in the axial direction increases as the bus bar 37 with the coupling portion 37c positioned on the lower side. According to the present embodiment, when the 1 st connection terminal 37a and the coil end 33a are welded, the welding jig is moved in the circumferential direction without moving in the axial direction, whereby the 1 st connection terminal 37a and the coil end 33a can be welded, and the manufacturing is easy. In addition, the axial positions of at least the upper side portions of the respective 2 nd connecting terminals 37b of the three bus bars 37 are the same as each other. That is, the axial positions of the respective 2 nd connecting terminals 37b of the plurality of bus bars 37 are the same as each other. Among the plurality of bus bars 37, the length of the 2 nd connection terminal 37b in the axial direction increases as the bus bar 37 with the coupling portion 37c positioned on the lower side. According to the present embodiment, it is easy to connect the terminals of the external power supply and the like to the 2 nd connection terminals 37 b.

The pair of plate surfaces of the 1 st connection terminal 37a face in the radial direction. As shown in fig. 4, the 1 st connection terminal 37a is located at an end portion on the outer side in the radial direction of the body portion 42. The 1 st connecting terminal 37a is exposed radially outward from the body 42. That is, the 1 st connection terminal 37a is exposed from the body portion 42 in the radial direction. The 1 st connection terminal 37a is radially opposed to the coil end 33a extending in the axial direction. That is, the coil end 33a faces the 1 st connection terminal 37 a. In the present embodiment, the coil end 33a is in contact with the 1 st connection terminal 37 a. The coil end 33a and the 1 st connection terminal 37a may face each other with a gap therebetween. According to the present embodiment, the coil end 33a is held by the coil holding portion 43 and faces the 1 st connection terminal 37a, whereby the coil end 33a and the 1 st connection terminal 37a are brought into contact or contactable with each other. The 1 st connection terminal 37a and the coil end 33a can be easily aligned. The electrical conduction between the bus bar 37 and the coil 33 can be easily ensured, and the number of assembly steps can be reduced. According to the present embodiment, assembly is easy.

The radially outer side of the body 42 is easier to secure a larger working space and easier to visually confirm than the radially inner side of the body 42. According to the present embodiment, since the 1 st connection terminal 37a is exposed radially outward from the body 42 and the coil holding portion 43 protrudes radially outward from the body 42, the 1 st connection terminal 37a and the coil end 33a can be connected to each other in the space radially outward of the body 42, and the assembly can be performed easily and accurately.

The circumferential position of the 1 st connection terminal 37a and the circumferential position of the coil holding portion 43 are the same as each other. As shown in fig. 3, the 1 st connection terminal 37a and the coil holding portion 43 are arranged in a radial direction when viewed in the axial direction. According to the present embodiment, the coil end 33a held by the coil holding portion 43 can be easily opposed to the 1 st connection terminal 37 a.

The coil holding portion 43 has a hook shape extending around the center line of the coil end 33 a. In the present embodiment, the coil holding portion 43 has a J-shape when viewed in the axial direction. As shown in fig. 4, the coil holding portion 43 has a coil end closing portion 43a at a radially inner portion of the coil holding portion 43, that is, a radially body portion 42 side portion. The coil end-closing ports 43a communicate the inside with the outside of the coil holding portion 43 as viewed in the axial direction. In the present embodiment, the coil end 33a is inserted into the coil holding portion 43 from the other circumferential side θ 2 to the one circumferential side θ 1 through the coil end closing port 43 a. That is, the coil end closing port 43a can receive the coil end 33a from the outside to the inside of the coil holding portion 43.

More specifically, the coil holding portion 43 includes the 1 st holding portion 43b, the 2 nd holding portion 43c, and the locking projection 43 d. The 1 st holding portion 43b projects radially outward from the body portion 42. That is, the 1 st holding portion 43b projects from the main body portion 42 in the radial direction. The 2 nd holding portion 43c extends from the radially outer end of the 1 st holding portion 43b to the other circumferential side θ 2. That is, the 2 nd holding portion 43c extends in the circumferential direction from the end portion of the 1 st holding portion 43b located on the opposite side in the radial direction from the main body portion 42. The locking projection 43d projects radially inward from the end of the other circumferential side θ 2 of the 2 nd holding portion 43 c. That is, the locking projection 43d projects from an end portion of the 2 nd holding portion 43c located on the opposite side of the 1 st holding portion 43b in the circumferential direction toward the radial body portion 42 side.

In the present embodiment, since the coil holding portion 43 is disposed so as to surround the coil end 33a, the state in which the coil end 33a is held by the coil holding portion 43 is easily maintained. Therefore, the 1 st connection terminal 37a and the coil end 33a can be easily aligned, and the assembly can be easily performed.

The coil holding portion 43 is elastically deformable. The radial distance between the locking projection 43d and the body portion 42 is equal to or less than the wire diameter of the coil end 33 a. The opening width of the center line of the coil end 33a of the coil end closing port 43a is equal to or less than the wire diameter of the coil end 33 a. The coil end 33a is inserted into the coil holding portion 43 through the coil end closing port 43a in a state where the coil holding portion 43 is elastically deformed, and when the coil end 33a is inserted into the coil holding portion 43, the coil holding portion 43 is restored and deformed. In the present embodiment, the coil holding portion 43 holds the coil end 33a by a so-called snap-fit structure. According to the present embodiment, since the coil end 33a is prevented from coming off the coil holding portion 43, the coil end 33a and the 1 st connection terminal 37a are easily connected.

The 1 st connection terminal 37a and the coil end 33a are soldered. In the present embodiment, since the 1 st connection terminal 37a and the coil end 33a face each other in a state of being positioned with each other, the 1 st connection terminal 37a and the coil end 33a can be stably soldered. The electrical conduction of the 1 st connection terminal 37a and the coil terminal 33a is stably ensured.

The pair of plate surfaces of the 2 nd connecting terminal 37b face in the radial direction. The lower portion of the 2 nd connection terminal 37b is embedded in the body 42. The upper side portion of the 2 nd connection terminal 37b protrudes upward from the body portion 42. That is, the 2 nd connection terminal 37b is exposed from the body portion 42 in the axial direction. As shown in fig. 3, in the present embodiment, the circumferential position of at least one support portion 45 of the plurality of support portions 45 and the circumferential position of the 2 nd connection terminal 37b are the same as each other. The at least one support portion 45 and the 2 nd connection terminal 37b are arranged in a radial direction as viewed in the axial direction. In the present embodiment, when an external power supply or the like, not shown, is connected to the 2 nd connection terminal 37b, an external force applied to the 2 nd connection terminal 37b from the axial direction can be received by the support portion 45. Rigidity of the bus bar device 36 can be ensured, and an external power supply or the like can be stably connected to the 2 nd connection terminal 37 b.

As shown in fig. 5, the pair of plate surfaces of the coupling portion 37c face in the axial direction. The coupling portion 37c couples the pair of 1 st connection terminals 37a and the one 2 nd connection terminal 37 b. The coupling portion 37c is embedded in the body 42. The coupling portion 37c has a 1 st coupling portion 37d extending in the circumferential direction and a 2 nd coupling portion 37e extending in the radial direction. The 1 st coupling portion 37d is provided with one bus bar 37. The 2 nd coupling portion 37e is provided with a pair of bus bars 37. The pair of 2 nd coupling portions 37e are arranged at intervals in the circumferential direction. In the present embodiment, the pair of 2 nd coupling parts 37e are connected to both circumferential end portions of the 1 st coupling part 37 d. A 1 st connection terminal 37a and a 2 nd connection terminal 37b are connected to both radial end portions of the 2 nd coupling portion 37e located on the one side θ 1 in the circumferential direction of the pair of 2 nd coupling portions 37 e. The 1 st connecting terminal 37a is connected to the radial outer end of the 2 nd coupling part 37e positioned on the other side θ 2 in the circumferential direction of the pair of 2 nd coupling parts 37 e.

As shown in fig. 2 and 3, the neutral point bus bar 34 has a plate shape, and the pair of plate surfaces face in the radial direction. The neutral point bus bar 34 is made of a metal and is made of a conductive material. The neutral point bus bar 34 extends in the circumferential direction. The neutral point bus bar 34 is elastically deformable. The neutral point bus bar 34 functions as a neutral point for electrically connecting the coils 33 of the respective phases to each other. A neutral point bus bar 34 is mounted to the insulator 32. The neutral point bus bar 34 is held by a plurality of insulator sections 40 arranged in the circumferential direction. The neutral point bus bars 34 are provided in plurality at intervals in the circumferential direction. In the present embodiment, two neutral point bus bars 34 are provided in a row in the circumferential direction. The plurality of neutral point bus bars 34 have the same shape as each other. That is, in the present embodiment, the plurality of neutral point bus bars 34 are common members (common products) of the same kind.

As shown in fig. 3, the neutral point bus bar 34 is held by at least three protrusions 41 from the radially inner side and the radially outer side of the neutral point bus bar 34 in an elastically deformed posture. In the present embodiment, the neutral point bus bar 34 is held from the radially inner side and the radially outer side by the plurality of protrusions 41 arranged in the circumferential direction in a posture in which at least a part of the circumferential direction is elastically deformed, and in the illustrated example, in a posture in which at least an end portion of the other circumferential direction θ 2 is elastically deformed toward the radially inner side. Specifically, the neutral point bus bar 34 is changed from the state before elastic deformation shown by the two-dot chain line in fig. 3 to the state after elastic deformation shown by the solid line, and is contacted from the radial inside of the neutral point bus bar 34 by the two protrusions 41 (the 2 nd protrusion 41b), and is contacted from the radial outside of the neutral point bus bar 34 by the two protrusions 41 (the 1 st protrusion 41 a). That is, in the present embodiment, the neutral point bus bar 34 can be held in addition to the bus bar device 36 by the plurality of projections 41 of the insulator 32.

In the present embodiment, the neutral point bus bar 34 in the elastically deformed posture is held by the three or more protrusions 41 arranged at different positions in the circumferential direction by the restoring deformation force and the frictional resistance. Hereinafter, the holding state of the neutral point bus bar 34 may be simply referred to as "elastic holding". For example, in comparison with the case where the neutral point bus bar is held by being sandwiched between the inside of the groove extending in the circumferential direction or between the pair of wall portions facing each other with a gap therebetween in the radial direction, which is different from the present embodiment, the present embodiment can easily ensure the management accuracy of the dimensions of the insulator 32 and the neutral point bus bar 34. In other words, even in the case where the management accuracy of the respective dimensions of the insulator 32 and the neutral point bus bar 34 is low, the neutral point bus bar 34 is easily attached to the insulator 32. Therefore, the motor 1 of the present embodiment is easy to assemble.

The neutral point bus bar 34 extends over a plurality of insulator portions 40 arranged in the circumferential direction, and is held from the radially inner side and the radially outer side of the neutral point bus bar 34 by at least two 1 st projections 41a and one 2 nd projection 41 b. The neutral point bus bar 34 is elastically held by at least two 1 st projections 41a and one 2 nd projection 41b arranged in the circumferential direction. Specifically, in the present embodiment, the neutral point bus bar 34 extends over two circumferentially adjacent insulator portions 40, and is held on both sides in the radial direction of the neutral point bus bar 34 by the respective radially inner surfaces of the two 1 st protrusions 41a and the respective radially outer surfaces of the two 2 nd protrusions 41 b. According to the present embodiment, the components can be made common to facilitate assembly, and various operational effects described in the present embodiment can be obtained.

In the present embodiment, the 1 st projection 41a and the 2 nd projection 41b are arranged at different positions in the radial direction, and specifically, the 1 st projection 41a is arranged radially outward of the 2 nd projection 41 b. Of the plurality of projections 41, the 2 nd projection 41b located on the radially inner side is in contact with the radially inner surface of the neutral point bus bar 34, and the 1 st projection 41a located on the radially outer side is in contact with the radially outer surface of the neutral point bus bar 34. The 1 st and 2

nd protrusions

41a and 41b of the plurality of insulator portions 40 arranged in the circumferential direction are arranged in a zigzag manner along the circumferential direction. According to the present embodiment, the neutral point bus bar 34 is easily inserted between the three or more protrusions 41. It is easy to assemble the neutral point bus bar 34 to the insulator 32.

As shown in fig. 8 and 9, in the present embodiment, since the axial positions of the 1 st projection 41a and the 2 nd projection 41b are the same as each other, the region in which the neutral point bus bar 34 is disposed can be suppressed to be small in the axial direction. For example, unlike the case of the present embodiment in which the axial position of the 1 st projection and the axial position of the 2 nd projection are different from each other, the neutral point bus bar held by the 1 st projection and the 2 nd projection extends obliquely in the axial direction as it goes toward the circumferential direction, whereby the area where the neutral point bus bar is disposed becomes larger in the axial direction, and there is a possibility that the outer shape of the motor in the axial direction becomes larger. On the other hand, according to the present embodiment, since the neutral point bus bar 34 held by the 1 st projection 41a and the 2 nd projection 41b extends in the circumferential direction, the outer shape of the motor 1 in the axial direction can be suppressed to be small.

In the present embodiment, the neutral point bus bar 34 is supported from below by the bus bar support 40 g. That is, the neutral point bus bar 34 is axially supported by the bus bar support 40 g. The end surface of the neutral point bus bar 34 facing downward and the surface constituting the bus bar support 40g are in contact with each other in the axial direction. According to the present embodiment, the insulator 32 supports the neutral point bus bar 34 from the radially inner side, the radially outer side, and the axial direction. Therefore, the insulator 32 can stably hold the neutral point bus bar 34.

In the present embodiment, since the bus bar receiving base 40g is disposed on the 2 nd end surface 40f located above the 1 st end surface 40e, a gap is provided in the axial direction between the 1 st end surface 40e and the neutral point bus bar 34 supported by the bus bar receiving base 40 g. By welding the neutral point bus bar 34 and the coil end 33a at a portion other than the bus bar receiving seat 40g in the circumferential direction, it is possible to suppress the outer wall portion 40c from being sandwiched by the welding jig, and to suppress heat from being transmitted from the neutral point bus bar 34 to the insulator 32 with difficulty, thereby suppressing a trouble such as melting of the insulator 32 due to heat. In the present embodiment, the circumferential position of the 1 st projection 41a and the circumferential position of the bus bar receiving seat 40g are the same, and the 1 st projection 41a and the bus bar receiving seat 40g are arranged in the radial direction. Therefore, for example, compared to a case where the circumferential position of the first projection and the circumferential position of the bus bar holder are different from each other unlike in the present embodiment, according to the present embodiment, the weldable portion between the neutral point bus bar 34 and the coil end 33a can be expanded in the circumferential direction.

In the present embodiment, the radially outer surface of the 2 nd projection 41b is a curved surface that projects outward in the radial direction, that is, the radially outer surface of the projection 41 is a convex curved surface. In addition, the neutral point bus bar 34 extends in the circumferential direction. Therefore, in a state where the neutral point bus bar 34 is elastically deformed, the radially inner surface of the neutral point bus bar 34 is easily brought into contact with the radially outer surface of the projection 41. Therefore, the neutral point bus bar 34 is easily assembled to the insulator 32.

In the present embodiment, since the radially inner surface of the first projection 41a is a flat surface, that is, the radially inner surface of the projection 41 is a flat surface, a large contact area between the radially inner surface of the projection 41 and the radially outer surface of the neutral point bus bar 34 can be ensured, and the neutral point bus bar 34 can be easily and stably held by the projection 41. Further, since the length of the 1 st projection 41a in the circumferential direction is larger than the length of the 2 nd projection 41b in the circumferential direction, a larger contact area between the radially inner surface of the 1 st projection 41a and the radially outer surface of the neutral point bus bar 34 can be ensured. Further, since the radially inner side surface of the 1 st projection 41a is positioned radially outward as it goes toward the one circumferential side θ 1, the neutral point bus bar 34 is easily guided toward the radially outer side surface of the 2 nd projection 41b adjacent to the one circumferential side θ 1 of the 1 st projection 41 a. Therefore, the neutral point bus bar 34 is easily inserted between the 1 st projection 41a and the 2 nd projection 41 b.

The neutral point bus bar 34 has a bent portion 34a and a flat plate portion 34 b. The bent portion 34a constitutes a part of the neutral point bus bar 34 in the circumferential direction. The bent portion 34a is a bent plate-like portion. The radially outer side surface of the bent portion 34a projects radially outward as viewed in the axial direction. That is, the bent portion 34a protrudes outward in the radial direction. The radially inner side surface of the bent portion 34a is recessed toward the radially outer side as viewed in the axial direction. The bent portion 34a is provided in plurality at intervals in the circumferential direction. In the present embodiment, two bent portions 34a are provided on one neutral point bus bar 34 at intervals from each other in the circumferential direction.

In the present embodiment, the radially inner surface of the bent portion 34a of the neutral point bus bar 34 is in contact with the radially outer surface of the 2 nd projection 41b, that is, the radially outer surface of the projection 41. Since the neutral point bus bar 34 has the bent portion 34a, the neutral point bus bar 34 can be elastically held by the three or more protrusions 41 without elastically deforming the neutral point bus bar 34 to a large extent, that is, while suppressing the amount of elastic deformation of the neutral point bus bar 34 to a small amount. The neutral point bus bar 34 is easily attached to the insulator 32, and thus the assembly is easy. In addition, the neutral point bus bar 34 can be easily positioned with respect to the insulator 32 in the circumferential direction.

The flat plate portion 34b constitutes a part of the neutral point bus bar 34 in the circumferential direction. The flat plate portion 34b is a flat plate having a pair of plate surfaces which are flat. The flat plate portion 34b is a portion of the neutral point bus bar 34 that is connected to the bent portion 34a in the circumferential direction. That is, the flat plate portion 34b is connected to the bent portion 34a in the circumferential direction. As shown in fig. 9, the coil end 33a faces the radially outer surface of the flat plate portion 34 b. Specifically, the coil end 33a passing through the recess 40d in the radial direction is bent upward, so that the coil end 33a and the flat plate portion 34b are opposed to each other in the radial direction. From this state, the flat plate portion 34b and the coil end 33a can be easily fixed by welding.

The plurality of flat plate portions 34b are arranged in the circumferential direction. In the present embodiment, three flat plate portions 34b are provided in a row in the circumferential direction on one neutral point bus bar 34. The three flat plate portions 34b are disposed in the neutral point bus bar 34 at intermediate portions between the end portion on one circumferential side θ 1, the end portion on the other circumferential side θ 2, and both circumferential end portions. A radially outer side surface of at least one flat plate portion 34b of the plurality of flat plate portions 34b contacts a radially inner side surface of the 1 st projection 41 a. In the present embodiment, in one neutral point bus bar 34, the radially outer surfaces of the two flat plate portions 34b are in contact with the radially inner surfaces of the two 1 st protrusions 41 a. That is, the radially outer side surface of the flat plate portion 34b contacts the radially inner side surface of the projection 41. According to the present embodiment, a large contact area of the neutrally point-contactable busbar 34 and the projection 41 is ensured, and the contact state of the neutral point busbar 34 and the projection 41 is stabilized. The neutral point bus bar 34 is stably elastically held by the protrusion 41.

The present invention is not limited to the above-described embodiments, and for example, as described below, structural modifications and the like can be made without departing from the scope of the present invention.

In the above-described embodiment, the example in which the 1 st connection terminal 37a is exposed radially outward from the body portion 42 and the coil holding portion 43 protrudes radially outward from the body portion 42 has been described, but the present invention is not limited to this. The 1 st connection terminal 37a may be exposed radially inward from the body 42, and the coil holding portion 43 may be projected radially inward from the body 42.

In the above-described embodiment, the example in which the coil end close-up port 43a is opened at the end portion of the other circumferential side θ 2 in the coil holding portion 43 has been given, but the invention is not limited thereto. It is also possible that the coil end close-up 43a is open at the end of the coil holding portion 43 on the one circumferential side θ 1.

In the above-described embodiment, the bus bar device 36 and the neutral point bus bar 34 are positioned and attached to the insulator 32 by the projection 41, respectively, but the present invention is not limited thereto. The neutral point bus bar 34 may not be provided. For example, a member other than the neutral point bus bar 34 may be positioned by the projection 41 and attached to the insulator 32.

In the above-described embodiment, the motor 1 is mounted on the electric power steering apparatus as an example, but the present invention is not limited thereto. The motor 1 may be used for a pump, a brake, a clutch, a vacuum cleaner, a dryer, a ceiling fan, a washing machine, a refrigerator, and the like.

In addition, the respective configurations (constituent elements) described in the above-described embodiment, modification, supplementary description, and the like may be combined, and addition, omission, replacement, and other changes of the configuration may be made, without departing from the scope of the present invention. The present invention is not limited to the above embodiments, but is limited only by the claims.

Claims

1. A bus bar device for a stator centered on a central axis, wherein,

the bus bar device includes:

a bus bar; and

a resin part in which at least a part of the bus bar is embedded,

the resin part has:

a main body portion extending in a circumferential direction; and

a coil holding portion that protrudes in a radial direction from the main body portion and holds a coil end of a coil included in the stator,

the bus bar has a 1 st connection terminal exposed in a radial direction from the body portion,

the coil end is opposed to the 1 st connection terminal.

2. The bus bar device according to claim 1,

the coil end is in contact with the 1 st connection terminal.

3. The bus bar device according to claim 1 or 2,

the 1 st connecting terminal is exposed from the body portion to the outside in the radial direction,

the coil holding portion protrudes radially outward from the main body portion.

4. The bus bar device according to any one of claims 1 to 3,

the circumferential position of the 1 st connection terminal and the circumferential position of the coil holding portion are the same as each other.

5. The bus bar device according to any one of claims 1 to 4,

the coil holding part has a hook shape extending around a center line of the coil end,

the coil holding portion has a coil termination opening at a portion of the coil holding portion on the main body portion side in a radial direction.

6. The bus bar device according to any one of claims 1 to 5,

the coil holding portion includes:

a 1 st holding portion that protrudes in a radial direction from the main body portion;

a 2 nd holding portion extending in a circumferential direction from an end portion of the 1 st holding portion located on a side opposite to the main body portion in a radial direction; and

and a locking protrusion protruding from an end portion of the 2 nd holding portion located on a side opposite to the 1 st holding portion in the circumferential direction toward the body portion side in the radial direction.

7. The bus bar device according to claim 6,

the coil holding part is capable of being elastically deformed,

the radial distance between the locking projection and the body is equal to or less than the wire diameter of the coil end.

8. The bus bar device according to any one of claims 1 to 7,

the 1 st connection terminal and the coil terminal are soldered.

9. The bus bar device according to any one of claims 1 to 8,

the resin part has a mounting part protruding from the main body part in a radial direction,

the mounting portion is mounted on an insulator included in the stator.

10. The bus bar device according to claim 9,

the mounting portion has a through hole penetrating the mounting portion in an axial direction,

the protrusion of the insulator is inserted into the through hole.

11. The bus bar device according to claim 10,

the mounting portion is in contact with an end surface of the insulating member facing one axial side,

the projection has a tip end portion projecting from the through hole toward one axial side,

the distal end portion has a portion facing the mounting portion from one axial side.

12. The bus bar device according to claim 10 or 11,

the mounting portion and the projection portion inserted into the through hole are welded.

13. The bus bar device according to any one of claims 10 to 12,

the through-hole has a non-circular cross-section perpendicular to the central axis,

the protrusion has a non-circular cross-section perpendicular to the central axis.

14. The bus bar device according to any one of claims 1 to 13,

the bus bar has a 2 nd connection terminal axially exposed from the main body portion,

the resin portion has a support portion that protrudes in a radial direction from the main body portion and contacts an insulator included in the stator from an axial direction,

the support portions are provided in plurality at intervals in the circumferential direction,

the circumferential position of at least one of the support portions and the circumferential position of the 2 nd connection terminal are the same as each other.

15. A stator, having:

a cylindrical stator core extending in an axial direction;

an insulator mounted to the stator core;

a coil attached to the stator core with the insulator interposed therebetween; and

the bus bar arrangement of any one of claims 1 to 14.

16. A motor, comprising:

a rotor centered on the central axis; and

the stator of claim 15 disposed radially outward of the rotor.