阅读说明：本技术 马达 (Motor ) 是由 石田尚 山崎诚 于 2020-09-27 设计创作，主要内容包括：本发明提供马达,其具有：转子,其以中心轴线为中心；以及定子,其配置于转子的径向外侧。定子具有：筒状的定子铁芯,其沿轴向延伸；绝缘件,其安装于定子铁芯；线圈,其隔着绝缘件安装于定子铁芯；以及能够弹性变形的汇流条,其与线圈连接,沿周向延伸。绝缘件具有：卷绕部,其供线圈卷绕；以及突部,其配置于卷绕部的径向外侧,比卷绕部沿轴向突出。突部沿周向相互隔开间隔地设置有三个以上。汇流条以被迫弹性变形的姿势至少被三个突部从汇流条的径向内侧和径向外侧保持。(The present invention provides a motor, which comprises: a rotor centered on a central axis; and a stator disposed radially outside the rotor. The stator has: a cylindrical stator core extending in an axial direction; an insulator mounted to the stator core; a coil attached to the stator core with an insulator interposed therebetween; and an elastically deformable bus bar connected to the coil and extending in the circumferential direction. The insulating member has: a winding section around which the coil is wound; and a protrusion disposed radially outward of the winding portion and protruding in the axial direction from the winding portion. The projections are provided at intervals in the circumferential direction. The bus bar is held by at least three projections from radially inner and radially outer sides of the bus bar in a posture of being forced to be elastically deformed.)

1. A motor, comprising:

a rotor centered on a central axis; and

a stator disposed radially outward of the rotor,

the stator has:

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

an elastically deformable bus bar connected to the coil and extending in a circumferential direction,

the insulating member has:

a winding portion around which the coil is wound; and

a protrusion disposed radially outward of the winding portion and protruding in an axial direction from the winding portion,

three or more protrusions are provided at intervals in the circumferential direction,

the bus bar is held by at least three of the projections from radially inner and radially outer sides of the bus bar in a posture of being forced to be elastically deformed.

2. The motor of claim 1,

the insulator has a plurality of insulator portions arranged in a circumferential direction,

the insulator portion has:

one of the winding portions; and

a plurality of said projections being provided in a plurality,

the plurality of projections have:

a 1 st projection; and

a 2 nd protrusion disposed at a position different from the 1 st protrusion in a circumferential direction,

the bus bar extends over a plurality of the insulator portions arranged in the circumferential direction, and is held from the radially inner side and the radially outer side of the bus bar by at least two of the 1 st projections and one of the 2 nd projections.

3. The motor of claim 2,

the 1 st projection and the 2 nd projection are arranged at different positions in a radial direction.

4. The motor according to claim 2 or 3,

an axial position of the 1 st protrusion and an axial position of the 2 nd protrusion are the same as each other.

5. The motor according to any one of claims 1 to 4,

the bus bar has a bent portion protruding radially outward.

6. The motor of claim 5,

the bus bar has a flat plate portion connected to the bent portion in a circumferential direction.

7. The motor according to any one of claims 1 to 6,

the insulating member has:

an outer wall portion that is disposed radially outward of the winding portion and that protrudes in an axial direction from the winding portion; and

a recessed portion recessed in the axial direction from an end surface of the outer wall portion facing the axial direction,

the projection projects in the axial direction from the end surface of the outer wall portion,

the protrusion and the recess are arranged at different positions in the circumferential direction.

8. The motor of claim 7,

the insulator has a bus bar support seat at the end face,

the bus bar is axially supported by the bus bar support base.

9. The motor of claim 8,

the insulating member has:

a 1 st end face constituting a part of the end face; and

and a 2 nd end surface constituting a part of the end surface and located on one axial side of the 1 st end surface, wherein the bus bar receiving base is located on the 2 nd end surface.

10. The motor according to any one of claims 1 to 9,

the radially outer side surface of the projection is a curved surface that projects toward the radially outer side.

11. The motor according to any one of claims 1 to 10,

the radially inner side of the projection is planar.

12. The motor according to any one of claims 1 to 11,

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

Technical Field

The present invention relates to 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. The brushless motor described in patent document 1 includes an insulator provided with a receiving groove along a circumferential direction. The plurality of receiving grooves are provided at intervals in the circumferential direction. The main body portion of the bus bar is received in the plurality of receiving grooves.

Patent document 1: japanese patent No. 5256669

In the conventional motor, it is difficult to attach the bus bar to the insulator. Specifically, if the dimensions of the storage groove and the bus bar are not managed with high accuracy, there is a possibility that the bus bar moves inside the storage groove or does not enter the storage groove.

Disclosure of Invention

In view of the above circumstances, an object of the present invention is to provide a motor which is easy to assemble.

A motor according to one embodiment of the present invention includes: a rotor centered on a central axis; and a stator disposed radially outside the rotor. The stator has: 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 an elastically deformable bus bar connected to the coil and extending in the circumferential direction. The insulating member has: a winding portion around which the coil is wound; and a protrusion disposed radially outward of the winding portion and protruding in an axial direction from the winding portion. The projections are provided at three or more intervals in the circumferential direction. The bus bar is held by at least three of the projections from radially inner and radially outer sides of the bus bar in a posture of being forced to be elastically deformed.

According to 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 an insulator (insulator portion) and a bus bar of a stator according to an embodiment.

Fig. 5 is a perspective view showing a part of an insulator, a 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; 34: a bus bar; 34 a: a bending section; 34 b: a flat plate portion; 40: an insulator portion; 40 a: a winding section; 40 c: an outer wall portion; 40 d: a recessed portion; 40 e: 1 st end face; 40 f: a 2 nd end surface; 40 g: a busbar support base; 40 h: an end face; 41: a protrusion; 41 a: a 1 st projection; 41 b: a 2 nd protrusion; 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 when the motor 1 is viewed in plan. 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 shaft 21. The rotor core 22 is smaller in length in the axial direction than the shaft 21. 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 34, and a connection terminal 35. In fig. 1, the bus bar 34 and the connection terminal 35 are not shown.

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. 4 and 5, 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. 4 and 5, 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 a middle 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 to 5, the radially outer side 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. 4 and 5, 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. 5, 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. The drawn coil end 33a can be easily welded to the radially outer surface of the bus bar 34, for example. 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.

The 1 st end face 40e constitutes a part of the end face 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. 5, 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 the bus bar 34. Although not particularly shown, in the present embodiment, the coil end 33a of the coil 33 of each phase is fixed to the bus bar 34 by welding. That is, the bus bar 34 is connected to the coil 33.

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

As shown in fig. 3, the bus bar 34 is held by at least three protrusions 41 from the radially inner side and the radially outer side of the bus bar 34 in a posture of being forced to be elastically deformed. In the present embodiment, the 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 of the other circumferential direction θ 2 is elastically deformed inward in the radial direction. Specifically, the bus bar 34 changes from the state before elastic deformation shown by the two-dot chain line in fig. 3 to the state of forced elastic deformation shown by the solid line, and contacts from the inside in the radial direction of the bus bar 34 by the two protrusions 41 (the 2 nd protrusion 41b), and contacts from the outside in the radial direction of the bus bar 34 by the two protrusions 41 (the 1 st protrusion 41 a).

In the present embodiment, the 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 bus bar 34 may be simply referred to as "elastic holding". For example, in comparison with the case where the 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 bus bar 34. In other words, even when the management accuracy of the respective dimensions of the insulator 32 and the bus bar 34 is low, the bus bar 34 is easily attached to the insulator 32. Therefore, the motor 1 of the present embodiment is easy to assemble.

The 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 bus bar 34 by at least two 1 st projections 41a and one 2 nd projection 41 b. The 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 bus bar 34 extends over two circumferentially adjacent insulator portions 40, and is held from both sides in the radial direction of the bus bar 34 by the respective radially inner surfaces of the two first protrusions 41a and the respective radially outer surfaces of the two second 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 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 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 bus bar 34 can be easily inserted between the three or more protrusions 41. It is easy to assemble the bus bar 34 to the insulator 32.

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 bus bar 34 is disposed can be kept small in the axial direction. For example, when the axial position of the 1 st projection and the axial position of the 2 nd projection are different from each other unlike the present embodiment, the bus bar held by the 1 st projection and the 2 nd projection extends obliquely in the axial direction as it goes to the circumferential direction, whereby the region where the bus bar is arranged 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 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 bus bar 34 is supported from below by the bus bar support 40 g. That is, the bus bar 34 is axially supported by the bus bar support 40 g. The end surface of the 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 bus bar 34 from the radial inside, the radial outside, and the axial direction. Therefore, the insulator 32 can stably hold the 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, the bus bar 34 received by the bus bar receiving base 40g is spaced apart from the 1 st end surface 40e in the axial direction. By welding the 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 held by the welding jig, and to suppress heat from being transmitted from the bus bar 34 to the insulator 32, and to suppress 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 in the present embodiment, the weldable portion between the bus bar 34 and the coil end 33a can be expanded in the circumferential direction according to the present embodiment.

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 bus bar 34 extends in the circumferential direction. Therefore, in the state where the bus bar 34 is elastically deformed, the radially inner surface of the bus bar 34 is easily brought into contact with the radially outer surface of the projection 41. Therefore, the 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 bus bar 34 can be ensured, and the 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 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 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 bus bar 34 is easily inserted between the 1 st protrusion 41a and the 2 nd protrusion 41 b.

As shown in fig. 3 to 5, the bus bar 34 has a bent portion 34a and a flat plate portion 34 b. The bent portion 34a constitutes a part of the circumferential direction of the bus bar 34. 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 bus bar 34 at intervals in the circumferential direction.

In the present embodiment, the radially inner surface of the bent portion 34a of the bus bar 34 is in contact with the radially outer surface of the 2 nd projecting portion 41b, that is, the radially outer surface of the projecting portion 41. By providing the bus bar 34 with the bent portion 34a, the bus bar 34 can be elastically held by the three or more protrusions 41 without elastically deforming the bus bar 34 to a large extent, that is, while the amount of elastic deformation of the bus bar 34 can be suppressed to be small. The bus bar 34 is easily attached to the insulator 32, and the assembly is easy. In addition, the 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 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 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. 5, 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 bus bar 34. The three flat plate portions 34b are disposed at an end portion of one circumferential side θ 1, an end portion of the other circumferential side θ 2, and an intermediate portion between the circumferential end portions of the bus bar 34. 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 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 between the bus bar 34 and the projection 41 is ensured, and the contact state between the bus bar 34 and the projection 41 is stabilized. The bus bar 34 is stably elastically held by the protrusion 41.

As shown in fig. 2 and 3, the connection terminal 35 is mounted on the insulating member 32. The connection terminal 35 is fixed to the insulator 32. The connection terminal 35 is made of a metal and is made of a conductive material. An external power supply and the like, not shown, are connected to the connection terminal 35. The connection terminal 35 has a plate shape. The plurality of connection terminals 35 are provided at intervals from each other in the circumferential direction. In the present embodiment, three connection terminals 35 are provided at intervals from each other in the circumferential direction. The connection terminal 35 has a mounting hole 35a, a connection portion 35b, and a coil end holding portion 35 c.

The mounting hole 35a penetrates a plate-like portion of the connection terminal 35 extending perpendicularly to the central axis J in the axial direction. The mounting hole 35a has a non-circular shape in cross section perpendicular to the central axis J. In the present embodiment, the shape of the cross section perpendicular to the central axis J of the mounting hole 35a is a shape in which one of four sides of a quadrangle is replaced with a convex arc. The 2 nd protrusion 41b is axially inserted into the mounting hole 35 a. That is, the projection 41 is inserted into the mounting hole 35 a. The protrusion 41 is fitted inside the mounting hole 35a, whereby the connection terminal 35 is positioned with respect to the insulator 32. In detail, in the present embodiment, since the projection 41 of the insulator 32 has a non-circular cross section perpendicular to the central axis J, the projections 41 other than the projection 41 for elastically holding the bus bar 34 among the plurality of projections 41 can be used for positioning the connection terminal 35. According to the present embodiment, the rotation of the connection terminal 35 with respect to the protrusion 41 can be suppressed, and the connection terminal 35 can be easily positioned with respect to the insulator 32. It is easy to assemble the connection terminal 35 to the insulator 32.

The connection portion 35b is located at an upper end portion of a plate-like portion extending in the axial direction in the connection terminal 35. The connection portion 35b is connected to a terminal of an external power supply or the like, not shown. Although not particularly shown, the coil end holding portion 35c holds the coil end 33a of the coil 33. In the present embodiment, the coil end holding portion 35c has a J-shape when viewed in the axial direction, and can hold the coil end 33a extending in the axial direction. The coil end holding portion 35c and the coil end 33a are fixed by welding, for example.

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 bus bar 34 and the connection terminal 35 are positioned by the projection 41 and attached to the insulating member 32, but the present invention is not limited thereto. For example, a member other than the connection terminal 35 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.