JPWO2019065584A1 - motor - Google Patents

Abstract

The stator has a group of coils of a plurality of systems, and the bus bar unit includes a plurality of phase bus bars connected to the leader wires drawn from the coils of each phase, and a bus bar holder holding the plurality of phase bus bars. The compatible bus bar has a plate shape, and at least the direction in which the bus bar main body is orthogonal to the axial direction is arranged as the thickness direction, and is along the circumferential direction of the bus bar main body among the plurality of compatible bus bars. The busbar with the longest length overlaps at least a part of the other busbars in the radial direction, and passes in the radial direction opposite to the direction in which the coil terminals of the other busbars extend. .. [Selection diagram] FIG. 9

Description

The present invention relates to a motor.

A three-phase motor is known to be provided with a bus bar for connecting coils (for example, Patent Document 1). On the other hand, in recent years, a motor that ensures redundancy by connecting a three-phase motor to a plurality of systems has been desired.

Japan Publication No. 2016-208578

In a motor having a plurality of systems, there is a problem that the number of bus bars increases and the motor becomes large as a result.

In view of the above problems, one aspect of the present invention is to provide a motor capable of miniaturization while adopting a plurality of systems.

The motor of the present invention includes a rotor that rotates about a central axis extending in the vertical direction, a stator that faces the rotor in the radial direction through a gap, and a bus bar unit provided on the upper side of the stator. The stator has a plurality of systems of the coil groups with the U-phase coil, the V-phase coil, and the W-phase coil as one system of coils, and the coil groups of different systems are arranged symmetrically around the central axis. The bus bar unit has a plurality of phase bus bars connected to leader wires drawn from coils of each phase, and a bus bar holder for holding the plurality of phase bus bars. Is a bus bar main body extending along the circumferential direction, a coil terminal located at one end of the bus bar main body and extending radially one side with respect to the bus bar main body and connected to the leader wire, and the bus bar main body. It has an external connection terminal located at the other end of the portion and extends upward, and the compatible bus bar has a plate shape, and at least the direction in which the bus bar main body portion is orthogonal to the axial direction is arranged as a thickness direction. Among the plurality of compatible bus bars, the compatible bus bar having the longest length along the circumferential direction of the bus bar main body portion overlaps with at least a part of the other compatible bus bars in the radial direction and is other in the radial direction. The coil terminal of the compatible bus bar passes on the side opposite to the extending direction.

According to one aspect of the present invention, it is possible to provide a motor that can be miniaturized while adopting a plurality of systems.

FIG. 1 is a cross-sectional view of the motor of one embodiment. FIG. 2 is a plan view of the stator of one embodiment. FIG. 3 is a schematic view showing the connection of each coil of the stator of one embodiment. FIG. 4 is a schematic view showing two systems of Y connections configured by the coil of one embodiment. FIG. 5 is a perspective view of the bus bar unit of one embodiment. FIG. 6 is an exploded perspective view of the bus bar unit of one embodiment. FIG. 7 is a plan view of the bus bar unit of one embodiment. FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. FIG. 9 is a bottom view of the bus bar unit of one embodiment. FIG. 10 is a schematic cross-sectional view taken along the line XX of FIG. FIG. 11 is a schematic view showing an electric power steering device of one embodiment.

Hereinafter, the motor according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure may be different from the actual structure.

In each figure, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, the Z-axis direction is a direction parallel to the axial direction of the central axis J shown in FIG. The X-axis direction is a direction orthogonal to the Z-axis direction and is the left-right direction in FIG. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction.

In the following description, the positive side (+ Z side) in the Z-axis direction is referred to as "upper side", and the negative side (-Z side) in the Z-axis direction is referred to as "lower side". The upper side and the lower side are directions used only for explanation, and do not limit the actual positional relationship or direction. Unless otherwise specified, the direction parallel to the central axis J (Z-axis direction) is simply referred to as "axial direction" or "vertical direction", and the radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction centered on the central axis J, that is, the circumference of the central axis J is simply referred to as the "circumferential direction". Further, in the following description, the "planar view" means a state viewed from the axial direction.

[Motor] FIG. 1 is a cross-sectional view of the motor 1 of the present embodiment. The motor 1 of this embodiment is a three-phase AC motor. Further, the motor 1 of the present embodiment is an inner rotor type motor.

The motor 1 includes a rotor 20 having a shaft 21, a stator 30, a bus bar unit 60, a housing 40, an upper bearing (bearing) 6A, a lower bearing 6B, and a bearing holder 10. The motor 1 is connected to the external device (control unit) 9 by the external connection terminals 71c, 72c, 73c extending upward from the bus bar unit 60. The rotation of the rotor 20 of the motor 1 is controlled by an external device 9.

[Housing] The housing 40 has a tubular shape that opens upward (+ Z side). The housing 40 houses the rotor 20 and the stator 30. The housing 40 has a tubular portion 45, a bottom portion 49, and a lower bearing holding portion 48.

The tubular portion 45 surrounds the stator 30 from the outside in the radial direction. In the present embodiment, the tubular portion 45 has a cylindrical shape centered on the central axis J. The bottom portion 49 is located at the lower end of the tubular portion 45. The bottom 49 is located below the stator 30. The lower bearing holding portion 48 is located at the center of the bottom portion 49 in a plan view. The lower bearing holding portion 48 holds the lower bearing 6B. The lower bearing holding portion 48 has a holding cylinder portion 48a extending in the axial direction about the central axis J, and a lower end protruding portion 48b extending radially inward from the lower end of the holding cylinder portion 48a. A hole 48c penetrating in the axial direction is provided at the center of the lower end protruding portion 48b in a plan view.

[Rotor] The rotor 20 rotates about the central axis J. The rotor 20 includes a shaft 21, a rotor core 24, and a rotor magnet 23. The shaft 21 is arranged along the central axis J with the central axis J extending in the vertical direction (axial direction) as the center. The shaft 21 is rotatably supported around the central axis J by the upper bearing 6A and the lower bearing 6B.

The rotor core 24 is fixed to the shaft 21. The rotor core 24 surrounds the shaft 21 in the circumferential direction. The rotor magnet 23 is fixed to the rotor core 24. More specifically, the rotor magnet 23 is fixed to the outer surface of the rotor core 24 along the circumferential direction. The rotor core 24 and the rotor magnet 23 rotate together with the shaft 21.

[Upper Bearing and Lower Bearing] The upper bearing 6A rotatably supports the shaft 21 provided on the rotor 20 on the upper side of the rotor core 24. The upper bearing 6A is supported by the bearing holder 10. The lower bearing 6B rotatably supports the shaft 21 provided on the rotor 20 below the rotor core 24. The lower bearing 6B is supported by the lower bearing holding portion 48 of the housing 40.

[Bearing holder] The bearing holder 10 is located on the upper side (+ Z side) of the stator 30. Further, the bearing holder 10 is located above the bus bar unit 60 described later. The bearing holder 10 holds the upper bearing 6A. Further, the bearing holder 10 is held by the tubular portion 45 of the housing 40. The plan view (XY view view) shape of the bearing holder 10 is, for example, a circular shape concentric with the central axis J.

The bearing holder 10 includes a disc-shaped bearing holder main body 16, an upper bearing holding portion 18 located on the radial inside of the bearing holder main body 16, and a fitting cylinder located on the radial outside of the bearing holder main body 16. It has a part 15. The upper bearing holding portion 18, the bearing holder main body portion 16, and the fitting cylinder portion 15 are arranged in this order from the inner side to the outer side in the radial direction.

The bearing holder main body 16 extends along a plane orthogonal to the axial direction. The bearing holder main body 16 is provided with a through hole 16a through which the external connection terminals 71c, 72c, 73c of the bus bar unit 60 are inserted.

The upper bearing holding portion 18 holds the upper bearing 6A. The upper bearing holding portion 18 is located at the center of the bearing holder 10 in a plan view. The upper bearing holding portion 18 has a holding cylinder portion 18a extending in the axial direction about the central axis J, and an upper end protruding portion 18b extending radially inward from the upper end of the holding cylinder portion 18a. The upper end protruding portion 18b positions the upper bearing 6A in the vertical direction. A hole 18c penetrating in the axial direction is provided at the center of the upper end protruding portion 18b in a plan view. The upper end of the shaft 21 is inserted into the hole 18c.

The fitting cylinder portion 15 extends downward from the outer edge of the bearing holder main body portion 16. The fitting cylinder portion 15 extends in a tubular shape along the circumferential direction. The fitting tubular portion 15 is fitted so as to face the inner peripheral surface 45c of the tubular portion 45 in the radial direction. As a result, the bearing holder 10 is fixed to the housing 40.

[Stator] The stator 30 is arranged in an annular shape around the central axis J. The stator 30 faces the rotor 20 in the radial direction through a gap. The stator 30 surrounds the radial outside of the rotor 20. The stator 30 is fixed to the inner peripheral surface 45c of the tubular portion 45 of the housing 40. The stator 30 has a stator core 31, an upper insulator (insulator) 35, a lower insulator 34, and a coil 33.

FIG. 2 is a plan view of the stator 30. Note that FIG. 2 shows a part of the coil terminals 71a, 72a, 73a, 81a, 82a of the bus bar unit 60, which will be described later.

The stator core 31 is composed of a plurality of core pieces 32 arranged in an annular shape along the circumferential direction. In the stator core 31, core pieces 32 adjacent to each other in the circumferential direction are connected to each other. That is, the stator core 31 is configured by connecting a plurality of core pieces 32 along the circumferential direction.

The core piece 32 has a core back portion 32a, a teeth portion 32b, and an umbrella portion 32c. That is, the stator core 31 has a plurality of core back portions 32a, a plurality of teeth portions 32b, and a plurality of umbrella portions 32c. The stator core 31 of the present embodiment is composed of 12 core pieces 32. Therefore, the stator 30 of the present embodiment has 12 tooth portions 32b. The number of core pieces 32 and teeth portions 32b is not limited to this.

The core back portion 32a extends along the circumferential direction. The core back portion 32a is connected to the core back portion 32a of the adjacent core piece 32 at the end portion facing the circumferential direction. The core back portions 32a adjacent to each other in the circumferential direction are joined by welding or the like. As a result, the core back portions 32a of all the core pieces 32 are connected in an annular shape.

The tooth portion 32b extends radially inward from the center of the core back portion 32a in the circumferential direction. A coil 33 is wound around the teeth portion 32b via the upper insulator 35 and the lower insulator 34.

The umbrella portion 32c is located at the tip (diameter inner end portion) of the teeth portion 32b. The dimension along the circumferential direction of the umbrella portion 32c is larger than the dimension along the circumferential direction of the teeth portion 32b and smaller than the dimension along the circumferential direction of the core back portion 32a. The surface of the umbrella portion 32c facing inward in the radial direction faces the rotor magnet 23 of the rotor 20.

Further, the stator core 31 of the present embodiment is composed of a plurality of core pieces 32 as so-called divided cores. However, the core piece constituting the stator core 31 may be a curling core in which adjacent core back portions 32a are partially connected to each other and bent in an annular shape after winding the coil 33.

As shown in FIG. 1, the upper insulator 35 covers at least the upper side of the teeth portion 32b of the upper surface of the stator core 31. Similarly, the lower insulator 34 covers at least the lower side of the teeth portion 32b of the lower surface of the stator core 31. That is, the upper insulator 35 covers the upper surface of the teeth portion 32b, and the lower insulator 34 covers the lower surface of the teeth portion 32b. The upper insulator 35 and the lower insulator 34 are made of a material having an insulating property. The upper insulator 35 and the lower insulator 34 have the same configuration except that they are provided on opposite sides in the vertical direction of the stator core 31.

As shown in FIG. 2, the upper insulator 35 has a plurality of insulator pieces 36 located above each core piece 32. Although not shown, the lower insulator 34 has a plurality of insulator pieces 36 like the upper insulator 35.

The number of insulator pieces 36 of the upper insulator 35 is the same as that of the core pieces 32 (12 in this embodiment). One insulator piece 36 is arranged on the upper side of one core piece 32. The plurality of insulator pieces 36 are arranged in an annular shape along the circumferential direction.

The insulator piece 36 has a base portion 36b, a first standing wall portion 36a, and a second standing wall portion 36c. The base portion 36b is located above the teeth portion 32b and covers the upper surface of the teeth portion 32b. The first standing wall portion 36a projects upward from the radial outer end portion of the base portion 36b and extends along the circumferential direction. The first standing wall portion 36a is located above the core back portion 32a. The second standing wall portion 36c projects upward from the radial inner end of the base portion 36b and extends along the circumferential direction. The second standing wall portion 36c is located above the umbrella portion 32c.

A coil 33 is wound around the base 36b. The first standing wall portion 36a and the second standing wall portion 36c face each other in the radial direction with the base portion 36b interposed therebetween. The first standing wall portion 36a and the second standing wall portion 36c guide the coil 33 wound around the base portion 36b from the outside and the inside in the radial direction, respectively.

The first standing wall portion 36a has a pair of end faces 36d facing both sides in the circumferential direction and an outer peripheral surface 36e facing outward in the radial direction. The end faces 36d of the adjacent insulator pieces 36 face each other in the circumferential direction. A chamfer 36f is provided between the first standing wall portion 36a and the outer peripheral surface 36e. A V-shaped leg accommodating portion 37 is provided between the chamfers 36f of the adjacent insulator pieces 36 when viewed from the axial direction. That is, the upper insulator 35 is provided with a leg accommodating portion 37.

Conventionally, there is known a structure in which a recess provided on the outer peripheral surface of one insulator piece facing outward in the radial direction is used as a leg accommodating portion. On the other hand, according to the present embodiment, the leg accommodating portion 37 is provided by abutting the chamfers 36f of the pair of insulator pieces 36 arranged in the circumferential direction in the radial direction. Therefore, it is not necessary to provide a recess in one insulator piece 36, and when the insulator piece 36 is manufactured by injection molding, the degree of freedom in the pulling direction of the insulator piece 36 can be increased. As a result, the insulator piece 36 can be manufactured at low cost.

The leg accommodating portion 37 has a V-shape that opens on one side in the radial direction (diametrically outside in this embodiment) and narrows toward the other side (diameter inside in this embodiment) when viewed from the axial direction. Is. The leg accommodating portion 37 is located above the boundary portion between adjacent core pieces 32 when viewed from the axial direction.

The leg portion 65 of the bus bar unit 60 described later is accommodated in the leg portion accommodating portion 37. The leg portion 65 fits in a V shape of the leg portion accommodating portion 37. That is, the leg portion 65 has a V shape that becomes narrower toward the other side in the radial direction (inward in the radial direction in the present embodiment) when viewed from the axial direction.

The coil 33 is configured by winding a coil wire around the teeth portion 32b via the upper insulator 35 and the lower insulator 34. Therefore, the plurality of coils 33 are arranged in an annular shape along the circumferential direction.

In the present embodiment, the stator 30 is provided with 12 coils 33. The 12 coils 33 are wound in a continuous arc with a pair of coils 33 as a set. The two coils 33 wound in a continuous arc are connected via a crossover 33b. The crossover 33b passes above the coil 33. The crossover wire 33b is insulated from the coil 33 by an insulating tube (not shown).

From each coil 33, one leader line 33a extends upward. The leader wire 33a corresponds to the winding start and winding end of the two coils 33 that are wound in a continuous arc. Therefore, one leader line 33a extends from one coil 33. The leader wire 33a is connected to the coil terminals 71a, 72a, 73a, 81a, 82a described later. The coil terminals 71a, 72a, 73a, 81a, 82a are the coil terminals 71a, 72a, 73a of the phase bus bars 71, 72, 73, and the coil terminals 81a, 82a of the neutral point bus bars 81, 82. ,are categorized.

FIG. 3 is a schematic view showing the connection of each coil 33 of the stator 30. The 12 coils 33 of the stator 30 are four U-phase coils U1a, U1b, U2a, U2b, four V-phase coils V1a, V1b, V2a, V2b, and four W-phase coils W1a, W1b, W2a, W2b. And consists of.

FIG. 4 is a schematic view showing two systems of Y connections composed of 12 coils 33. As shown in FIG. 4, the stator 30 has a U-phase coil, a V-phase coil, and a W-phase coil as one coil group, and a coil group (first system) of a plurality of systems (two systems in this embodiment). It has a coil group 7 and a second system coil group 8). That is, the stator 30 has two coil groups 7 and 8 classified into a coil group 7 of the first system and a coil group 7 of the second system.

The coil group 7 of the first system has U-phase coils U1a and U1b, V-phase coils V1a and V1b, and W-phase coils W1a and W1b. Further, the coil group 8 of the second system has U-phase coils U2a and U2b, V-phase coils V2a and V2b, and W-phase coils W2a and W2b. That is, two coils 33 are provided in one phase of each system. The two coils 33 of each phase of each system are connected by a crossover 33b. In other words, in each system, a plurality of U-phase coils, V-phase coils, and W-phase coils are provided, and are provided across the plurality of teeth portions 32b via the crossover 33b.

In the coil group 7 of the first system, the U-phase coils U1a and U1b, the V-phase coils V1a and V1b, and the W-phase coils W1a and W1b are connected to each other by Y connection. Similarly, in the coil group 8 of the second system, the U-phase coils U2a and U2b, the V-phase coils V2a and V2b and the W-phase coils W2a and W2b are connected to each other by Y connection.

As shown in FIG. 3, one of the two leader lines 33a of the two U-phase coils U1a and U1b of the first system connected via the crossover 33b is the U-phase bus bar 71A of the first system phase bus bar group 70A described later. The other leader line 33a is connected to the first system neutral point bus bar 81.

Similarly, one of the two leader lines 33a of the two V-phase coils V1a and V1b of the first system connected via the crossover 33b is connected to the V-phase bus bar 72A of the first system phase bus bar group 70A and the other. The leader line 33a is connected to the first system neutral point bus bar 81.

Further, one of the leader lines 33a of the two W-phase coils W1a and W1b of the first system connected via the crossover 33b is connected to the W-phase bus bar 73A of the first system phase bus bar group 70A, and the other leader is connected. The line 33a is connected to the first system neutral point bus bar 81.

As described above, one ends of the U-phase coils U1a, U1b, V-phase coils V1a, V1b, W-phase coils W1a, and W1b of the first system are connected to different phase bus bars 71, 72, and 73, respectively. That is, the plurality of phase bus bars 71, 72, 73 are connected to the leader wire 33a drawn from the coil 33 of each phase, respectively. Further, the other ends of the U-phase coils U1a, U1b, V-phase coils V1a, V1b, W-phase coils W1a, and W1b of the first system are connected to the neutral point bus bar 81 of the first system. That is, one first system neutral point bus bar 81 is connected to a leader wire 33a drawn from the coils 33 of each phase. As a result, the U-phase coils U1a and U1b of the first system, the V-phase coils V1a and V1b, and the W-phase coils W1a and W1b form a Y connection.

The connection configuration of the coils 33 of each phase of the coil group 8 of the second system is the same as the connection configuration of the coils of each phase of the coil group 7 of the first system. That is, the U-phase coils U2a and U2b of the second system are connected to the U-phase bus bar 71B of the second system and the neutral point bus bar 82 of the second system. The V-phase coils V2a and V2b of the second system are connected to the V-phase bus bar 72B of the second system and the neutral point bus bar 82 of the second system. The W-phase coils W2a and W2b of the second system are connected to the W-phase bus bar 73B of the second system and the neutral point bus bar 82 of the second system. As a result, the U-phase coils U2a and U2b of the second system, the V-phase coils V2a and V2b, and the W-phase coils W2a and W2b form a Y connection.

According to the present embodiment, the stator 30 has a plurality of coil groups (coil group 7 of the first system and coil group 8 of the second system). Further, in the stator 30, the coils 7 and 8 having different systems are arranged symmetrically around the central axis J. As a result, the redundancy of the motor 1 can be ensured. That is, even if a problem occurs in any one of the coil groups 7 and 8 of the plurality of systems, the motor 1 can be smoothly driven by using the coil groups of the other systems.

[Bus bar unit] The bus bar unit 60 is provided in the motor 1. The bus bar unit 60 is located between the stator 30 and the bearing holder 10 in the axial direction. That is, the bus bar unit 60 is provided above the stator 30 and below the bearing holder 10.

FIG. 5 is a perspective view of the bus bar unit 60. FIG. 6 is an exploded perspective view of the bus bar unit 60. FIG. 7 is a plan view of the bus bar unit 60.

The bus bar unit 60 includes a bus bar holder 61, a pair of terminal supports (external connection terminal support) 66, a first system phase bus bar group 70A, a second system phase bus bar group 70B, and a first system neutral point bus bar. It includes 81 and a second system neutral point bus bar 82.

The first system phase bus bar group 70A and the first system neutral point bus bar 81 are connected to the coil group 7 of the first system. Further, the second system phase bus bar group 70B and the second system neutral point bus bar 82 are connected to the coil group 8 of the second system.

The first system phase bus bar group 70A and the second system phase bus bar group 70B are fixed to one side (upper side in the present embodiment) of the bus bar holder 61 in the axial direction, and the first system neutral point bus bar 81 and the second system are fixed. The neutral point bus bar 82 is fixed to the other side (lower side in this embodiment) of the bus bar holder 61 in the axial direction. In addition, in this specification, "one side" and "the other side" do not indicate a specific direction. That is, the above description can be paraphrased as follows. The first system neutral point bus bar 81 and the second system neutral point bus bar 82 are fixed to one side in the axial direction of the bus bar holder 61, and the first system phase bus bar group 70A and the second system phase bus bar group 70B are It is fixed to the other side of the bus bar holder 61 in the axial direction.

Further, the first system phase bus bar group 70A has a U phase bus bar 71A, a V phase bus bar 72A, and a W phase bus bar 73A. Similarly, the second system phase bus bar group 70B has a U phase bus bar 71B, a V phase bus bar 72B, and a W phase bus bar 73B.

In the following description, when the U-phase bus bars 71A and 71B of different systems are not distinguished, they are simply referred to as U-phase bus bars 71. Further, when the V-phase bus bars 72A and 72B of different systems are not distinguished, they are simply referred to as V-phase bus bars 72. When the W-phase bus bars 73A and 73B of different systems are not distinguished, they are simply referred to as W-phase bus bars 73. Further, when the U-phase bus bar 71, the V-phase bus bar 72 and the W-phase bus bar 73 are not distinguished, they are simply referred to as the phase bus bars 71, 72 and 73. Similarly, when the first system neutral point bus bar 81 and the second system neutral point bus bar 82 are not distinguished, they are simply referred to as neutral point bus bars 81 and 82.

The U-phase bus bars 71A and 71B, the V-phase bus bars 72A and 72B, and the W-phase bus bars 73A and 73B are compatible bus bars (first bus bars). That is, the plurality of phase bus bars 71, 72, 73 have U-phase coils U1a, U1b, U2a, U2b, V-phase coils V1a, V1b, respectively, of the coil group 7 of the first system and the coil group 8 of the second system. Includes phase busbars connected to V2a, V2b and W-phase coils W1a, W1b, W2a, W2b, respectively.

(Busbar Holder) As shown in FIG. 1, the busbar holder 61 is provided on the upper side of the stator 30. The bus bar holder 61 holds the compatible bus bars 71, 72, 73 and the neutral point bus bars 81, 82. The bus bar holder 61 is made of a resin material.

As shown in FIG. 6, the bus bar holder 61 includes a holder main body (bus bar holder main body) 62, a pair of base portions 63, a plurality of (six in the present embodiment) holding portions 64, and a plurality (the present embodiment). It has 6) legs 65 and.

The holder main body 62 has an annular shape centered on the central axis J when viewed from the axial direction. The holder body 62 is located between the compatible bus bars 71, 72, 73 and the neutral point bus bars 81, 82 in the axial direction. Further, the holder main body 62 has an upper surface 62a facing upward and a lower surface 62b facing downward. A plurality of compatible bus bars 71, 72, 73 are arranged on the upper surface 62a of the holder main body 62. A plurality of neutral point bus bars 81 and 82 are arranged on the lower surface 62b of the holder main body 62.

As shown in FIG. 1, a first wall portion 62c and a second wall portion 62d are provided on the lower surface 62b of the holder main body portion 62. That is, the bus bar holder 61 has a first wall portion 62c and a second wall portion 62d. The first wall portion 62c and the second wall portion 62d project axially from the lower surface 62b. Further, the first wall portion 62c and the second wall portion 62d extend along the circumferential direction, respectively. The first wall portion 62c is located radially outward with respect to the neutral point bus bars 81 and 82. The second wall portion 62d is located radially inward with respect to the neutral point bus bars 81 and 82. Therefore, the neutral point bus bars 81 and 82 are located between the first wall portion 62c and the second wall portion 62d in the radial direction and extend along the circumferential direction.

The lower surface 62b of the holder main body 62 is provided with a plurality of shaft portions 67a, 68a, 69a and a plurality of welded portions 67b, 68b, 69b located at the tips of the shaft portions 67a, 68a, 69a, respectively. That is, the bus bar holder 61 has a plurality of shaft portions 67a, 68a, 69a and a plurality of welded portions 67b, 68b, 69b. As will be described later with reference to FIG. 10, the plurality of welded portions 67b, 68b, 69b fix the neutral point bus bars 81 and 82 to the bus bar holder 61.

As shown in FIG. 6, the base portion 63 projects upward from the upper surface 62a of the holder main body portion 62. The pair of base portions 63 are located on opposite sides of the central axis J. Of the pair of base portions 63, one holds the external connection terminals 71c, 72c, 73c of the first system phase bus bar group 70A, and the other holds the external connection terminals 71c, 72c of the second system phase bus bar group 70B. , 73c is held.

The base portion 63 has an upper surface 63a facing upward. A terminal support 66 is mounted on the upper surface 63a of the base portion 63. The upper surface 63a is provided with four concave grooves (recesses) 63d. That is, the bus bar holder 61 is provided with a concave groove 63d. In the four concave grooves 63d, a part of the V-phase bus bar 72, a part of the W-phase bus bar 73, and two U-phase bus bars 71 of different systems (the U-phase bus bar 71A of the first system and the second system) A part of the U-phase bus bar 71B) of the system is inserted. As a result, the base portion 63 holds a plurality of compatible bus bars 71, 72, 73.

As shown in FIG. 1, the upper surface 63a of the base portion 63 is provided with a shaft portion 63b extending upward and a welding portion 63c located at the upper end of the shaft portion 63b. That is, the bus bar holder 61 has a shaft portion 63b and a welding portion 63c.

The shaft portion 63b passes through the fixing hole 66h provided in the terminal support 66. The welded portion 63c extends to the outside of the fixing hole 66h when viewed from the axial direction on the upper side of the fixing hole 66h of the terminal support 66. The welded portion 63c is a hemispherical shape that is convex upward. The welded portion 63c is formed by melting the upper end portion of the shaft portion 63b by heat. The welded portion 63c prevents the terminal support 66 from coming out of the shaft portion 63b. By providing the welding portion 63c, the terminal support 66 is fixed to the bus bar holder 61.

As shown in FIG. 7, the holding portion 64 is provided on the upper surface 62a of the holder main body portion 62. The sandwiching portion 64 has a pair of claw portions 64a extending upward from the upper surface 62a. The pair of claw portions 64a sandwiches and holds the compatible bus bars 71, 72, and 73 from the thickness direction. That is, the sandwiching portion 64 holds a plurality of compatible bus bars 71, 72, 73 from the thickness direction. In the present embodiment, the number (six) of the holding portions 64 is the same as the number (six) of the compatible bus bars 71, 72, and 73 provided on the upper side of the bus bar holder 61. Therefore, one compatible bus bar 71, 72, 73 is held by one holding portion 64. The number of sandwiching portions 64 may be more than 6.

A plurality of legs 65 (six in the present embodiment) are provided on the bus bar holder 61. The plurality of legs 65 are arranged at equal intervals around the central axis. The bus bar holder 61 is supported by the stator 30 at the legs 65.

As shown in FIG. 6, the leg portion 65 includes a radial extending portion 65a extending radially outward from the outer edge of the holder main body portion 62 and a lower side extending downward from the radial outer tip of the radial extending portion 65a. It has an extension portion 65b and. That is, the leg portion 65 extends downward with respect to the holder main body portion 62.

As shown in FIG. 9, the lower end portion 65c of the leg portion 65 has a V-shape that becomes narrower in the radial direction when viewed from the axial direction. As shown in FIG. 2, the V-shaped lower end portion 65c is accommodated in the leg accommodating portion 37 provided in the upper insulator 35. Further, the leg portion 65 comes into contact with the upper surface of the stator 30 at the lower end surface. As described above, the leg accommodating portion 37 has a V-shape having the same or similar shape as the lower end portion 65c of the leg portion 65 when viewed from the axial direction. By accommodating the leg portion 65 in the leg portion accommodating portion 37, the bus bar holder 61 is positioned with respect to the stator 30 in a plane orthogonal to the axial direction.

The leg accommodating portion 37 is provided above the boundary portion between the core pieces 32 adjacent to each other in the circumferential direction. The leg portion 65 accommodated in the leg portion accommodating portion 37 is provided above the boundary portion between the core pieces 32 adjacent to each other in the circumferential direction. That is, the legs 65 are arranged so as to overlap the boundaries between the core pieces 32 that are adjacent to each other in the circumferential direction when viewed from the axial direction.

According to the present embodiment, the lower end portion 65c of the leg portion 65 and the leg portion accommodating portion 37 have a V shape that becomes narrower toward one side in the radial direction, so that the leg portion 65 with respect to the leg accommodating portion 37 is formed. Can be easily inserted. In addition, each leg portion 65 contacts a V-shaped wall portion when viewed from the axial direction facing one side and the other side in the circumferential direction of the leg portion accommodating portion 37. Therefore, the positioning accuracy of the bus bar holder 61 in the circumferential direction can be improved. The leg accommodating portion 37 may have a shape other than the V shape. For example, the same effect can be obtained even if the shape is trapezoidal or semicircular.

As shown in FIG. 2, when viewed from the axial direction, a straight line connecting the leader line 33a drawn from each coil 33 and the central axis J is defined as a virtual line VL. When viewed from the axial direction, the leg portion 65 is located between the virtual lines VL of the leader lines 33a of the pair of coils 33 adjacent to each other in the circumferential direction. The leader line 33a is any one of coil terminals 71a, 72a, 73a, 81a, 82a provided in the plurality of compatible bus bars 71, 72, 73 and the plurality of neutral point bus bars 81, 82, respectively. Connected to.

According to the present embodiment, the legs 65 are arranged between the pair of virtual lines VL arranged in the circumferential direction, so that the legs 65 and the coil terminals 71a, 72a, 73a, 81a in the circumferential direction, It can be arranged so as to be offset from 82a. As a result, interference between the leg portion 65 and the coil terminals 71a, 72a, 73a, 81a, 82a and the leader wire 33a can be suppressed. In addition, the leg portion 65 is unlikely to interfere with the welding process between the coil terminals 71a, 72a, 73a, 81a, 82a and the leader wire 33a.

In the present embodiment, the plurality of coil terminals 71a, 72a, 73a, 81a, 82a are arranged alternately at a first interval along the circumferential direction and a second interval narrower than the first interval. Therefore, the plurality of virtual lines VL extending radially from the central axis J extend alternately at the first angle α and the second angle β smaller than the first angle α along the circumferential direction. The leg 65 of the present embodiment is located between a pair of virtual lines VL forming a first angle α. Regardless of whether the legs 65 are arranged between the pair of virtual lines VL forming the first angle α or between the pair of virtual lines VL forming the second angle β, the legs It is possible to obtain a certain effect of suppressing the interference between the portion 65 and the leader line 33a. Further, as shown in the present embodiment, by arranging the leg portion 65 between the pair of virtual lines VL forming the first angle α, the effect of suppressing the interference between the leg portion 65 and the leader line 33a is suppressed. Can be further enhanced.

When viewed from the axial direction, the leg portion 65 is located between a pair of coil terminals (for example, a pair of coil terminals 81a and 73a) connected to a leader wire 33a of a pair of coils 33 adjacent to each other in the circumferential direction. .. According to the present embodiment, even when the leg portion 65 and the coil terminals 81a and 73a are in the same radial position, the leg portion 65 and the coil terminals 81a and 73a are arranged so as to be displaced in the circumferential direction. Therefore, the interference between the leg portion 65 and the coil terminals 81a and 73a can be suppressed.

According to the present embodiment, since the interference between the leg portion 65 and the coil terminals 71a, 72a, 73a, 81a, 82a is suppressed by the above arrangement, the leg portion 65 and the coil terminals 71a, 72a, 73a, It is not necessary to displace 81a and 82a in the axial direction. More specifically, as shown in FIG. 5, a part of the leg portion 65 can be arranged so as to overlap a part of the coil terminals 82a in the axial direction. By arranging at least a part of the leg portion 65 so as to overlap the coil terminal 82a in the axial direction, the axial dimension of the bus bar unit 60 can be reduced.

(Compatible Bus Bars (First Bus Bar, Bus Bar)) A plurality of compatible bus bars 71, 72, 73 are fixed to the upper side of the bus bar holder 61. The plurality of compatible bus bars 71, 72, and 73 are classified into a first system phase bus bar group 70A and a second system phase bus bar group 70B. As described above, the first system phase bus bar group 70A and the second system phase bus bar group 70B have a U phase bus bar 71, a V phase bus bar 72, and a W phase bus bar 73, respectively.

The U-phase bus bars 71 of the first system phase bus bar group 70A and the second system phase bus bar group 70B have the same shape, and the first system phase bus bar group 70A and the second system phase bus bar group 70B have the same shape. The V-phase bus bars 72 have the same shape, and the W-phase bus bars 73 of the first system phase bus bar group 70A and the second system phase bus bar group 70B have the same shape.

As shown in FIG. 6, the U-phase bus bar 71 has a bus bar main body 71b, a coil terminal 71a, an external connection terminal 71c, and a protruding portion 71e. Similarly, the V-phase bus bar 72 has a bus bar main body 72b, a coil terminal 72a, an external connection terminal 72c, and a protruding portion 72e. Further, the W-phase bus bar 73 has a bus bar main body portion 73b, a coil terminal 73a, an external connection terminal 73c, and a protruding portion 73e.

The bus bar main body portions 71b, 72b, 73b extend along a plane orthogonal to the axial direction. The bus bar main body portions 71b, 72b, and 73b extend along the circumferential direction, respectively. The bus bar main body portions 71b, 72b, 73b are arranged with the direction orthogonal to the axial direction as the thickness direction.

The coil terminals 71a, 72a, and 73a are located at one ends of the bus bar main body 71b, 72b, and 73b, respectively. The coil terminals 71a, 72a, 73a extend radially outward from the bus bar main body portions 71b, 72b, 73b. The coil terminals 71a, 72a, 73a may extend radially inward with respect to the bus bar main body portions 71b, 72b, 73b. That is, the coil terminals 71a, 72a, 73a may extend to one side in the radial direction with respect to the bus bar main body portions 71b, 72b, 73b.

The coil terminals 71a, 72a, 73a are connected to the leader wire 33a. The coil terminals 71a, 72a, and 73a are portions that grip the leader wire 33a. The coil terminals 71a, 72a, and 73a have a substantially U-shape that opens inward in the radial direction. The coil terminals 71a, 72a, 73a are arranged with the direction orthogonal to the axial direction as the thickness direction.

The external connection terminals 71c, 72c, and 73c are located at the ends (the other ends) of the bus bar main bodies 71b, 72b, and 73b opposite to the coil terminals 71a, 72a, and 73a, respectively. The external connection terminals 71c, 72c, 73c extend upward from the bus bar main body portions 71b, 72b, 73b.

The three external connection terminals 71c, 72c, and 73c are provided in the first system phase bus bar group 70A and the second system phase bus bar group 70B, respectively. The external connection terminals 71c, 72c, 73c of the first system phase bus bar group 70A and the external connection terminals 71c, 72c, 73c of the second system phase bus bar group 70B are arranged on opposite sides of the central axis J. ..

The external connection terminals 71c, 72c, 73c are arranged with the direction orthogonal to the axial direction as the thickness direction. Further, the external connection terminal 71c of the U-phase bus bar 71 is arranged with the direction orthogonal to the radial direction as the plate width direction. On the other hand, the external connection terminals 72c and 73c of the V-phase bus bar 72 and the W-phase bus bar 73 are arranged with the direction orthogonal to the plate width direction of the external connection terminal 71c of the U-phase bus bar 71 as the plate width direction.

As shown in FIG. 6, the projecting portions 71e, 72e, 73e extend from the connection portion between the bus bar main body portions 71b, 72b, 73b and the external connection terminals 71c, 72c, 73c to the opposite side of the bus bar main body portion 71b. The protrusions 71e, 72e, and 73e are arranged with the direction orthogonal to the axial direction as the thickness direction.

The compatible bus bars 71, 72, 73 have recessed grooves (recessed grooves) provided in the bus bar holder 61 at the connecting portions between the bus bar main bodies 71b, 72b, 73b and the external connection terminals 71c, 72c, 73c and the protruding portions 71e, 72e, 73e. It is inserted into the recess) 63d. Therefore, the compatible bus bars 71, 72, 73 are held by the bus bar holder 61 at the roots of the external connection terminals 71c, 72c, 73c. Therefore, the stress received when the external connection terminals 71c, 72c, and 73c are inserted into the socket of the external device can be stably supported by the bus bar holder 61.

According to the present embodiment, the bus bar main body portions 71b, 72b, 73b and the protruding portions 71e, 72e, 73e are located at the roots of the external connection terminals 71c, 72c, 73c in the plate width direction of the external connection terminals 71c, 72c, 73c. Extends to both sides. The bus bar main bodies 71b, 72b, 73b and the protrusions 71e, 72e, 73e suppress rattling of the external connection terminals 71c, 72c, 73c in the plate width direction inside the concave groove 63d. As a result, the stability of inserting the external connection terminals 71c, 72c, and 73c into the socket of the external device can be improved.

In the compatible bus bars 71, 72, 73, the total widths of the bus bar main bodies 71b, 72b, 73b and the total widths of the protruding portions 71e, 72e, 73e overlap in the axial direction. Therefore, the stability of the external connection terminals 71c, 72c, 73c can be enhanced, and the effect of suppressing rattling on both sides of the external connection terminals 71c, 72c, 73c in the width direction can be enhanced.

As shown in FIG. 7, the U-phase bus bar 71 is a phase bus bar having the largest length along the circumferential direction of the bus bar main body among the three types of phase bus bars 71, 72, and 73. The bus bar body 71b of the U-phase bus bar 71 is located radially inside the bus bar bodies 72b and 73b of the other phase bus bars (V-phase bus bar 72 and W-phase bus bar 73). More specifically, the bus bar main body 71b of the U-phase bus bar 71 is located inside the V-phase bus bar 72 belonging to the bus bar group of the same system and the W-phase bus bar 73 belonging to the bus bar group of another system in the radial direction. To do.

The compatible bus bars 71, 72, 73 of the present embodiment are arranged so as to overlap each other in the radial direction in the bus bar main body portions 71b, 72b, 73b. Therefore, by arranging the bus bar main bodies 71b, 72b, 73b in the thickness direction orthogonal to the axial direction, the compatible bus bars 71, 72, 73 can be compactly arranged in the radial direction. As a result, the radial dimension of the bus bar unit 60 can be reduced.

According to the present embodiment, among the plurality of compatible bus bars 71, 72, 73, the U-phase bus bar 71 having the largest length along the circumferential direction of the bus bar main body 71b is the other compatible bus bar (that is, V). It overlaps at least a part of the phase bus bar 72 and the W phase bus bar 73) in the radial direction. Further, the bus bar main body 71b of the U-phase bus bar 71 is located on the side opposite to the direction in which the coil terminals 72a and 73a of the other phase bus bars extend in the radial direction. Therefore, the bus bar main body 71b of the U-phase bus bar 71 is sufficiently distanced in the radial direction from the leader wires 33a connected to the coil terminals 72a and 73a of the V-phase bus bar 72 and the W-phase bus bar 73. Can be placed apart. As a result, insulation can be ensured without separating the bus bar main body 71b of the U-phase bus bar 71 and the leader line 33a by a wall or the like.

In the present embodiment, the V-phase bus bar 72 and the W-phase bus bar 73 are held by the sandwiching portion 64 in a region extending in the radial direction of the coil terminals 72a and 73a. On the other hand, the U-phase bus bar 71 is held by the holding portion 64 in the bus bar main body portion 71b. The sandwiching portion 64 that holds the U-phase bus bar 71 does not radially overlap the V-phase bus bar 72 and the W-phase bus bar 73 in the radial direction. That is, of the plurality of compatible bus bars 71, 72, 73, the U-phase bus bar 71 having the largest length along the circumferential direction of the bus bar main body 71b is a region that does not overlap with the other compatible bus bars in the radial direction. The bus bar main body 71b is held by the holding portion 64. In other words, the bus bar main body portion 71b of the U-phase bus bar 71 radially overlaps the V-phase bus bar 72 and the W-phase bus bar 73 in a region not held by the holding portion 64. Therefore, the U-phase bus bar 71, the V-phase bus bar 72, and the W-phase bus bar 73 can be arranged close to each other in the radial direction.

The bus bar main body 71b of the U-phase bus bar 71 extends 180 ° around the central axis J along the circumferential direction. Therefore, the external connection terminal 71c located at one end of the bus bar main body 71b and the coil terminal 71a located at the other end of the bus bar main body 71b are arranged on opposite sides of the central axis J. As a result, while reducing the dimensions along the circumferential direction of the main bodies 72b and 73b of the other phase bus bars (V phase bus bar 72 and W phase bus bar 73), the external connection terminals 71c, 72c, 73c of one system Can be arranged side by side. In the present embodiment, the case where the U-phase bus bar 71 has the largest length along the circumferential direction of the bus bar main body among the plurality of compatible bus bars 71, 72, 73 has been described. However, when the bus bar main bodies 72b and 73b of the V-phase bus bar 72 or the W-phase bus bar 73 are longer than the bus bar main bodies of the other compatible bus bars, the bus bar main bodies 72b of these compatible bus bars 72 and 73 , 73b may extend 180 ° around the central axis J.

In the present embodiment, the external connection terminals 71c, 72c, 73c of the compatible bus bars 71, 72, 73 having different systems and the same phase are located on opposite sides of the central axis J. That is, the external connection terminals 71c, 72c, 73c of the pair of phase bus bars 71, 72, 73 connected to the coils 33 of the same phase of the coil group 7 of the first system and the coil group 8 of the second system are centered. It is arranged on the opposite side of the shaft J. As a result, the three external connection terminals 71c, 72c, and 73c of the first system and the second system can be arranged symmetrically about the central axis J. As a result, the motor 1 can be connected to the external device even if the circumferential position of the motor 1 is rotated by 180 °, and the process of connecting the motor 1 to the external device can be simplified.

When viewed from the axial direction, one of the external connection terminals 71c and the other coil terminal 71a of the first system U-phase bus bar 71A and the second system U-phase bus bar 71B are partially connected when viewed from the axial direction. Overlaps on. The bus bar main body 71b of the U-phase bus bar 71A has a crank portion 71d extending in the axial direction in the vicinity of the root of the external connection terminal 71c. By providing the crank portion 71d on the bus bar main body portion 71b, the external connection terminal 71c is offset upward, and interference with the coil terminal 71a is suppressed.

As shown in FIG. 6, the bus bar main bodies 72b and 73b of the V-phase bus bar 72 and the W-phase bus bar 73 do not have a portion corresponding to the crank portion 71d of the U-phase bus bar 71. Therefore, the bus bar main bodies 72b and 73b of the V-phase bus bar 72 and the W-phase bus bar 73 extend only in a plane orthogonal to the axial direction.

In the compatible bus bars 71, 72, 73, the bus bar main bodies 71b, 72b, 73b and the coil terminals 71a, 72a, 73a are formed by bending a plate material extending in one direction. Further, in the V-phase bus bar 72 and the W-phase bus bar 73, the total widths of the bus bar main bodies 72b and 73b and the total widths of the coil terminals 72a and 73a overlap in the axial direction. Therefore, when the V-phase bus bar 72 and the W-phase bus bar 73 are manufactured by press working, the V phase from the plate material is compared with the case where the coil terminal extends upward or downward with respect to the bus bar main body. The number of bus bars 72 and W-phase bus bars 73 can be increased.

(Terminal support (external connection terminal support)) The terminal support 66 is fixed to the upper side of the bus bar holder 61. The terminal support 66 covers the upper surface 63a of the base portion 63 of the bus bar holder 61. The terminal support 66 is made of a resin material.

The terminal support 66 has a terminal support main body 66a, three support portions 66b extending in a columnar shape upward from the terminal support main body 66a, and a convex portion 66d protruding downward from the terminal support main body 66a. The support portion 66b has a cylindrical shape. The three support portions 66b are arranged along the circumferential direction.

As shown in FIG. 1, the terminal support main body 66a is provided with a fixing hole 66h penetrating in the axial direction. The shaft portion 63b of the bus bar holder 61 is inserted into the fixing hole 66h.

Each of the three support portions 66b is provided with a holding hole 66c that penetrates in the axial direction. That is, the terminal support 66 is provided with three holding holes 66c. External connection terminals 71c, 72c, and 73c of the U-phase bus bar 71, the V-phase bus bar 72, and the W-phase bus bar 73 are inserted into the three holding holes 66c, respectively. As a result, the three holding holes 66c hold the external connection terminals 71c, 72c, and 73c.

The external connection terminals 71c, 72c, 73c are inserted from the lower side of the holding hole 66c and project to the upper side of the support portion 66b. The external connection terminals 71c, 72c, and 73c pass through the through hole 16a of the bearing holder 10 in the region surrounded by the support portion 66b.

According to this embodiment, the external connection terminals 71c, 72c, 73c are held by the holding holes 66c of the terminal support 66. As a result, the stability of the external connection terminals 71c, 72c, 73c when inserted into the socket of the external device can be improved.

According to this embodiment, the external connection terminals 71c, 72c, 73c are surrounded by the support portion 66b of the terminal support 66. Therefore, when the bus bar unit 60 is arranged under the bearing holder 10 and the external connection terminals 71c, 72c, 73c are inserted into the through holes 16a of the bearing holder 10, the external connection terminals 71c, 72c, 73c and the through holes 16a are inserted. A support portion 66b can be interposed between the inner peripheral surface of the bearing. As a result, the insulation between the external connection terminals 71c, 72c, 73c and the bearing holder 10 can be ensured.

As shown in FIG. 6, the convex portion 66d extends downward from the terminal support main body portion 66a in a plate shape. The convex portion 66d fits into the concave groove 63d of the bus bar holder 61. This makes it possible to increase the certainty of holding the terminal support 66 by the bus bar holder 61. Further, as a result, the certainty of holding the external connection terminals 71c, 72c, 73c held by the terminal support 66 can be improved.

As described above, the concave groove 63d is inserted with the bus bar main bodies 71b, 72b, 73b of the compatible bus bars 71, 72, 73. The convex portion 66d fits into the concave groove 63d from above the bus bar main body portions 71b, 72b, 73b. As a result, the compatible bus bars 71, 72, 73 can be pressed from above in the concave groove 63d, and the holding of the compatible bus bars 71, 72, 73 in the bus bar unit 60 can be stabilized.

Of the three convex portions 66d, the two convex portions 66d that press the bus bar main bodies 72b and 73b of the V-phase bus bar 72 and the W-phase bus bar 73 from above are located downward along the external connection terminals 72c and 73c, respectively. It extends and fits into the concave groove 63d. Therefore, these two convex portions 66d can press the vicinity of the roots of the external connection terminals 72c and 73c from above, and the effect of stabilizing the external connection terminals 72c and 73c is enhanced.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. FIG. 8 describes a fixing structure of the V-phase bus bar 72 inserted into the concave groove 63d. Although description is omitted here, the same fixing structure is adopted for the U-phase bus bar 71 and the W-phase bus bar 73 inserted into the other concave groove 63d.

The opening on the upper side of the concave groove 63d is provided with a tapered portion 63e whose groove width becomes wider toward the upper side. By providing the tapered portion 63e, the step of inserting the compatible bus bar 72 and the convex portion 66d into the concave groove 63d becomes easy.

The tip surface 66f of the convex portion 66d comes into contact with the surface of the compatible bus bar 72 facing upward. A welded portion 66e to be joined to the inner surface of the concave groove 63d is provided at the tip end portion of the convex portion 66d. The welded portion 66e is formed by melting and solidifying the tip of the convex portion 66d. The welded portion 66e is joined to the wall surface of the concave groove 63d and the compatible bus bar 72 in the process of solidification. As a result, the terminal support 66 can be firmly fixed to the bus bar holder 61. In addition, it is possible to effectively prevent the compatible bus bar 72 from coming out of the concave groove 63d. In this embodiment, the case where the welded portion 66e is provided at the tip end portion of the convex portion 66d is illustrated. It is sufficient that the welded portion 66e is provided at least a part of the convex portion 66d.

The terminal support 66 is made of a resin material including an integrally molded first resin portion 66A and a second resin portion 66B. That is, the terminal support 66 is molded by two-color molding. That is, the terminal support 66 is formed by molding the first resin portion 66A and the second resin portion 66B in two colors.

The second resin portion 66B is a thermoplastic resin material having a melting point lower than that of the first resin portion 66A. The terminal support main body portion 66a and the support portion 66b are composed of a first resin portion 66A. On the other hand, the convex portion 66d is composed of the second resin portion 66B.

According to the present embodiment, the welded portion 66e is composed of a second resin portion 66B having a low melting point. Therefore, the welded portion 66e can be easily formed by heating the terminal support 66 with the convex portion 66d inserted into the concave groove 63d. In this embodiment, the case where the entire convex portion 66d is composed of the second resin portion 66B is illustrated. However, a part of the portion of the convex portion 66d that fits into the concave groove 63d may be composed of the second resin portion 66B.

A procedure for fixing the terminal support 66 to the bus bar holder 61 in the method of manufacturing the bus bar unit 60 will be described. First, a bus bar attaching step of attaching the compatible bus bars 71, 72, 73 to the bus bar holder 61 is performed. In the phase bus bar attaching step, the phase bus bars 71, 72, 73 are inserted into the concave groove 63d provided in the bus bar holder 61.

Next, a terminal support attachment step (external connection terminal support attachment step) for attaching the terminal support 66 to the bus bar holder 61 is performed. In the terminal support attaching step, first, the external connection terminals 71c, 72c, 73c are inserted into the holding holes 66c of the terminal support 66. Next, the convex portion 66d of the terminal support 66 is fitted into the concave groove 63d from above the compatible bus bars 71, 72, 73. Further, heat is applied to the terminal support 66 to melt a part of the convex portion 66d and further solidify it to form a welded portion 66e to be joined to the inner surface of the concave groove 63d.

In the procedure for forming the welded portion 66e, a current may be passed through the compatible bus bars 71, 72, 73 to melt a part of the convex portion 66d. By passing an electric current through the phase bus bars 71, 72, 73, the phase bus bars 71, 72, 73 generate heat due to Joule heat. This heat is transmitted to the convex portion 66d and melts a part of the convex portion 66d. When the welded portion 66e is formed by passing an electric current through the compatible bus bars 71, 72, 73, only the tip portion of the convex portion 66d can be locally heated. Therefore, the welded portion 66e can be formed without affecting other parts of the terminal support 66. The current value flowing through the compatible bus bars 71, 72, and 73 when forming the welded portion 66e by Joule heat is sufficiently larger than the current value when driving the motor 1.

(Neutral point bus bar (second bus bar, bus bar)) As described above, the stator 30 of the present embodiment has two coil groups 7 and 8 (see FIG. 4). The plurality of neutral point bus bars 81 and 82 are provided in the same number as the number of coil groups (that is, the number of systems). Therefore, the bus bar unit 60 of the present embodiment has two neutral point bus bars 81 and 82.

FIG. 9 is a bottom view of the bus bar unit 60. As shown in FIG. 9, the neutral point bus bars 81 and 82 have bus bar main bodies 81b and 82b and three coil terminals 81a and 82a. The neutral point bus bars 81 and 82 are plate-shaped. In the neutral point bus bars 81 and 82, at least the bus bar main bodies 81b and 82b are arranged with the axial direction as the thickness direction.

The bus bar main bodies 81b and 82b extend along a plane orthogonal to the axial direction. The bus bar main body portions 81b and 82b extend along the circumferential direction in a region of 240 ° around the central axis J, respectively. At least a part of the bus bar main bodies 81b and 82b is exposed from the bus bar holder 61. That is, the neutral point bus bars 81 and 82 are not resin-insert molded into the bus bar holder 61.

The coil terminals 81a and 82a are connected to the leader wire 33a. The coil terminals 81a and 82a include a portion that grips the leader wire 33a. The plan-view shape of the coil terminals 81a and 82a is a substantially U-shape that opens inward in the radial direction. The coil terminals 81a and 82a are arranged with the direction orthogonal to the axial direction as the thickness direction.

The three coil terminals 81a and 82a are arranged at equal intervals along the length direction (that is, the circumferential direction) of the bus bar main body portions 81b and 82b, respectively. Of the three coil terminals 81a and 82a, two coil terminals 81a and 82a are located at both ends of the bus bar main body 81b and 82b, and the remaining one coil terminal 81a and 82a are the two coil terminals described above. It is located between 81a and 82a.

The coil terminals 81a and 82a extend in the radial direction away from the bus bar main body portions 81b and 82b. More specifically, the coil terminals 81a and 82a extend radially outward from the bus bar main body portions 81b and 82b.

The coil terminals 81a and 82a may extend radially inward with respect to the bus bar main body portions 81b and 82b. That is, the coil terminals 81a and 82a may extend to one side in the radial direction with respect to the bus bar main body portions 81b and 82b.

The coil terminals 81a and 82a of the neutral point bus bars 81 and 82 and the coil terminals 71a, 72a and 73a of the compatible bus bars 71, 72 and 73 are connected to the bus bar main bodies 81b, 82b, 71b, 72b and 73b, respectively. On the other hand, it extends in the same radial direction. By arranging in this way, the neutral point bus bars 81, 82 and the coil terminals 81a, 82a, 71a, 72a, 73a of the compatible bus bars 71, 72, 73 protrude from the bus bar holder 61 in the radial direction. You can align the directions. Therefore, the leader wires 33a extending from the stator 30 and connected to the coil terminals 81a, 82a, 71a, 72a, and 73a can be arranged so as to be aligned in the radial direction. As a result, the structure of the bus bar holder 61 that insulates the neutral point bus bars 81, 82 and the compatible bus bars 71, 72, 73 from the leader wire 33a (such as the first wall portion 62c in the present embodiment) is less likely to be complicated. .. Further, by arranging in this way, when viewed from the axial direction, the coil terminals 71a, 72a, 73a of the plurality of phase bus bars 71, 72, 73 and the coil terminals 81a of the plurality of neutral point bus bars 81, 82 , 82a line up on a single virtual circle VC around the central axis J. Therefore, in the welding process, by rotating the bus bar unit 60 and the stator 30 around the central axis J, the leader wire 33a and the coil terminals 81a, 82a, 71a, 72a, without moving the welding jig in the radial direction, 73a can be welded and connected. As a result, the welding process can be simplified.

The coil terminals 81a and 82a extend downward from the bus bar main body portions 81b and 82b. That is, the coil terminals 81a and 82a extend in the axial direction away from the compatible bus bars 71, 72 and 73. As a result, the coil terminals 81a and 82a can be arranged axially apart from the coil terminals 71a, 72a and 73a of the compatible bus bars 71, 72 and 73, and interference with each other can be suppressed. In addition, in the welding process between the coil terminal of one of the neutral point bus bars 81, 82 and the compatible bus bars 71, 72, 73 and the leader wire 33a, the other coil terminal deteriorates the welding workability. It can be suppressed.

The plurality of neutral point bus bars 81 and 82 are classified into a first system neutral point bus bar 81 and a second system neutral point bus bar 82. The first system neutral point bus bar 81 is connected to the leader wire 33a of the coil 33 of each phase (U phase, V phase, W phase) of the coil group of one system (coil group 7 of the first system). Similarly, the second system neutral point bus bar 82 is connected to the leader wire 33a of the coil 33 of each phase (U phase, V phase, W phase) of the coil group of one system (coil group 8 of the second system). Will be done. The coil terminals 71a, 72a, 73a of the phase bus bars 71, 72, 73 and the coil terminals 81a, 82a of the neutral point bus bars 81, 82 are alternately arranged along the circumferential direction.

As shown in FIG. 6, the plurality of neutral point bus bars 81 and 82 are fixed to the lower side of the bus bar holder 61. At least a part of the plurality of neutral point bus bars 81 and 82 overlap each other when viewed from the axial direction.

The plurality of neutral point bus bars 81 and 82 are plate materials in which at least the bus bar main bodies 81b and 82b are arranged with the axial direction as the thickness direction. That is, the neutral point bus bars 81 and 82 of this embodiment are so-called flat type. Therefore, even when a plurality of neutral point bus bars 81 and 82 are arranged so as to be overlapped in the axial direction, the dimensions in the axial direction are unlikely to increase.

According to the present embodiment, of the compatible bus bars 71, 72, 73 and the neutral point bus bars 81, 82, the neutral point bus bars 81, 82 are of the flat placement type. On the other hand, the compatible bus bars 71, 72, 73 are so-called vertical installation types in which the bus bar main bodies 71b, 72b, 73b are arranged with the axial direction as the thickness direction. Generally, at least three phase bus bars 71, 72, 73 are required corresponding to the U-phase, V-phase, and W-phase coils 33. For this reason, when the phase bus bars 71, 72, and 73 are placed horizontally and stacked in the axial direction, it is necessary to stack three or more layers corresponding to the bus bars of each phase. In addition, an insulating layer is provided between the laminated bus bars. Therefore, when three or more layers are required to be laminated, the axial dimension is the sum of the thickness of the three bus bars and the thickness of the insulating layer between them, and the layers are arranged in layers. The effect of miniaturization in the axial direction is reduced. According to the present embodiment, by stacking the two neutral point bus bars 81 and 82 as a flat type, the effect of dimension suppression in the axial direction can be enhanced. The insulating layer provided between the bus bars overlapping in the axial direction described above is an air layer in the present embodiment.

As shown in FIG. 9, the plurality of neutral point bus bars 81, 82 are arranged between the first wall portion 62c and the second wall portion 62d provided on the holder main body portion 62, and are arranged in the circumferential direction. Extend along. The first wall portion 62c and the second wall portion 62d are arranged so as to sandwich the bus bar main bodies 81b and 82b of the neutral point bus bars 81 and 82 in the radial direction.

According to the present embodiment, the first wall portion 62c is located between the bus bar main bodies 81b and 82b of the neutral point bus bars 81 and 82 and the leader line 33a when viewed from the axial direction. Thereby, the neutral point bus bars 81 and 82 and the leader wire 33a can be easily insulated.

According to the present embodiment, the neutral point bus bars 81 and 82 are sandwiched between the first wall portion 62c and the second wall portion 62d from inside and outside in the radial direction. Therefore, the neutral point bus bars 81 and 82 can be easily positioned in the radial direction.

According to the present embodiment, the rigidity of the holder main body 62 can be increased by providing the holder main body 62 with the first wall 62c and the second wall 62d.

The first wall portion 62c is provided with a first notch portion 62ca and a second notch portion 62cc. Further, only the second notch portion 62db is provided in the second wall portion 62d. The neutral point bus bars 81 and 82 are radially exposed in the first notch 62ca or the second notch 62cc, 62db.

The coil terminals 81a and 82a of the neutral point bus bars 81 and 82 pass through the first notch 62ca. By providing the first notch 62ca, it is possible to adopt a structure in which the coil terminals 81a and 82a directly extend radially outward from the bus bar main bodies 81b and 82b. That is, it is not necessary to provide the coil terminals 81a and 82a with a portion extending downward and overcoming the first wall portion 62c, and the neutral point bus bars 81 and 82 can be manufactured at low cost.

The second notched portions 62 cc and 62 db radially overlap with the wide portions 81s and 82s of the neutral point bus bars 81 and 82 described later. By providing the second cutout portions 62cc and 62db, it is possible to prevent the wide portions 81s and 82s from interfering with the bus bar holder 61.

In this embodiment, a part of the second notch 62cc is passed through the coil terminal 81a. That is, a part of the second notch 62cc also functions as a notch through which the coil terminal 81a passes.

Of the plurality of second notch portions 62cc provided in the first wall portion 62c, at least a part of the second notch portion 62cc is arranged so as to deviate from the leader line 33a in the radial direction. By arranging the second notch 62cc so as to deviate from the leader 33a in the radial direction, it is easy to secure insulation between the bus bar main bodies 81b and 82b exposed from the second notch 62cc and the leader 33a. In addition, all the second cutout portions 62cc may be arranged so as to be offset from the leader line 33a in the radial direction.

In the following description, of the plurality of neutral point bus bars 81 and 82, one located on the holder body 62 side (that is, the bus bar holder 61 side) is referred to as the first layer bus bar 81. Further, of the plurality of neutral point bus bars 81 and 82, the other one located outside the first layer bus bar 81 with respect to the holder main body portion 62 (bus bar holder 61 side) is referred to as the second layer bus bar 82. Further, in the following description, the first layer bus bar 81 and the second layer bus bar 82 are collectively referred to as neutral point bus bars 81 and 82. The first layer bus bar 81 is the first system neutral point bus bar 81 connected to the coil group 7 of the first system, and the second layer bus bar 82 connected to the coil group 8 of the second system is the second system. Neutral point bus bar 82.

FIG. 10 is a schematic cross-sectional view taken along the line XX of FIG. The bus bar main body 81b of the first layer bus bar 81 is provided with a fixing hole (through hole) 81h and a passing hole (through hole) 81i penetrating in the axial direction. The bus bar main body 82b of the second layer bus bar 82 is provided with a fixing hole (through hole) 82h and a retract hole (through hole) 82i penetrating in the axial direction.

In the present embodiment, the internal regions of the fixing holes 81h and 82h, the passing holes 81i and the evacuation holes 82i are surrounded by the bus bar main bodies 81b and 82b from all sides. However, the fixing holes 81h and 82h, the passing holes 81i and the retracting holes 82i may have a notched shape as long as they penetrate in the axial direction. That is, the internal regions of the fixing holes 81h and 82h, the passing holes 81i and the evacuation holes 82i need only be surrounded by the bus bar main bodies 81b and 82b from three sides, and the entire internal regions are surrounded by the bus bar main bodies 81b and 82b. It does not have to be.

The lower surface 62b of the holder main body 62 is provided with a plurality of shaft portions 67a, 68a, 69a and a plurality of welded portions 67b, 68b, 69b located at the tips of the shaft portions 67a, 68a, 69a, respectively. The welded portions 67b, 68b, and 69b are hemispherical surfaces that are convex downward. The welded portions 67b, 68b, 69b are formed by melting the tip portions of the shaft portions 67a, 68a, 69a by heat.

As shown in FIG. 9, the plurality of shaft portions 67a, 68a, 69a include three first shaft portions 67a, two second shaft portions 68a, and one third shaft portion 69a. Further, the plurality of welded portions 67b, 68b, 69b include a first welded portion 67b located at the tip of the first shaft portion 67a, a second welded portion 68b located at the tip of the second shaft portion 68a, and a third shaft. Includes a third welded portion 69b located at the tip of the portion 69a.

The first shaft portion 67a and the first welding portion 67b are provided to fix the first layer bus bar 81. The second shaft portion 68a, the third shaft portion 69a, the second welded portion 68b, and the third welded portion 69b are provided for fixing the second layer bus bar 82. Therefore, the first layer bus bar 81 and the second layer bus bar 82 are fixed by three welded portions, respectively.

The first welded portion 67b, the second welded portion 68b, and the third welded portion 69b are arranged on a single virtual circle around the central axis J. Therefore, in the heat caulking step of forming the first welding portion 67b, the second welding portion 68b, and the third welding portion 69b, the bus bar unit 60 is rotated around the central axis J to rotate the heat caulking jig in the radial direction. No need to move. As a result, the heat caulking process can be simplified. In FIG. 9, the illustration of a virtual circle in which the first welded portion 67b, the second welded portion 68b, and the third welded portion 69b are lined up is omitted. This virtual circle is a circle including arc-shaped X-rays shown in FIG.

As shown in FIG. 10, the first shaft portion 67a passes through the fixing hole 81h of the first layer bus bar 81. The first welded portion 67b is located below the first layer bus bar 81. The first welded portion 67b extends to the outside of the fixing hole 81h of the first layer bus bar 81 when viewed from the axial direction. The first welded portion 67b has a first fixed surface 67d facing upward at a portion extending outward with respect to the first shaft portion 67a. The first fixed surface 67d comes into contact with the lower surface 81p of the first layer bus bar 81. Further, the upper surface 81q of the first layer bus bar 81 comes into contact with the lower surface 62b of the holder main body 62. That is, the first layer bus bar 81 is sandwiched between the holder main body portion 62 and the first welding portion 67b. As a result, the first welded portion 67b fixes the first layer bus bar 81.

The evacuation hole 82i of the second layer bus bar 82 is located in a region where the first layer bus bar 81 and the second layer bus bar 82 overlap when viewed from the axial direction, and is below the first welding portion 67b for fixing the first layer bus bar 81. Located in. That is, the evacuation hole 82i overlaps with the first welding portion 67b when viewed from the axial direction. As shown in FIG. 9, the first welding portion 67b is located inside the inner peripheral surface of the evacuation hole 82i when viewed from the axial direction. That is, the first welded portion 67b is arranged in the evacuation hole 82i when viewed from the axial direction.

According to the present embodiment, when the first layer bus bar 81 is fixed in the area where the first layer bus bar 81 and the second layer bus bar 82 overlap by providing the evacuation hole 82i in the second layer bus bar 82, the first layer bus bar 81 is fixed. Even if the first-layer bus bar 81 and the second-layer bus bar 82 are arranged close to each other in the axial direction, interference between the first welded portion 67b and the second-layer bus bar 82 can be suppressed.

That is, according to the present embodiment, the first layer bus bar 81 can be fixed in the region where the first layer bus bar 81 and the second layer bus bar 82 overlap. Therefore, the welding portion 67b for fixing the first layer bus bar 81 can be arranged in a well-balanced manner in the length direction of the bus bar main body portion 81b of the first layer bus bar 81. In addition, since the first layer bus bar 81 and the second layer bus bar 82 can be arranged close to each other, the bus bar unit 60 can be miniaturized in the axial direction.

As shown in FIG. 10, the second shaft portion 68a is provided with a stepped surface 68c facing the side opposite to the holder main body portion 62 (that is, the side opposite to the bus bar holder 61, the lower side). The diameter of the second shaft portion 68a on the proximal end side (upper side) of the stepped surface 68c is larger than the diameter on the tip end side (lower side) of the stepped surface 68c.

The second shaft portion 68a passes through the passage hole 81i of the first layer bus bar 81 and the fixing hole 82h of the second layer bus bar 82. The lower surface 81p of the first layer bus bar 81 is located above the stepped surface 68c. Therefore, the passage hole 81i of the first layer bus bar 81 is inserted into the second shaft portion 68a on the proximal end side of the stepped surface 68c.

On the other hand, the second layer bus bar 82 is located below the stepped surface 68c. The upper surface 82q of the second layer bus bar 82 comes into contact with the stepped surface 68c. Therefore, the fixing hole 82h of the second layer bus bar 82 is inserted into the second shaft portion 68a on the tip end side of the stepped surface 68c.

The second welded portion 68b is located below the second layer bus bar 82. The second welded portion 68b extends to the outside of the fixing hole 82h of the second layer bus bar 82 when viewed from the axial direction. The second welded portion 68b has a second fixed surface 68d facing upward at a portion that extends outward with respect to the second shaft portion 68a. The second fixed surface 68d comes into contact with the lower surface 82p of the second layer bus bar 82. Since the upper surface 82q of the second layer bus bar 82 contacts the stepped surface 68c, the second layer bus bar 82 is sandwiched between the stepped surface 68c and the second welded portion 68b. As a result, the second welding portion 68b fixes the second layer bus bar 82.

According to the present embodiment, the second layer bus bar 82 can be fixed in the region where the first layer bus bar 81 and the second layer bus bar 82 overlap. Further, since the second shaft portion 68a passes through the passage hole 81i of the first layer bus bar 81, the first layer bus bar 81 can be positioned in a plane orthogonal to the axial direction. In addition, at least a part of the outer peripheral surface of the second shaft portion 68a may be in contact with the inner peripheral surface of the passage hole 81i in the region on the proximal end side (upper side) of the stepped surface 68c. In this case, the accuracy of positioning the first layer bus bar 81 by the second shaft portion 68a can be improved.

As shown in FIG. 10, a step portion 62e projecting downward is provided on the lower surface 62b of the holder main body portion 62. The step portion 62e has a step portion lower surface 62f facing downward. The third shaft portion 69a projects downward from the lower surface 62f of the step portion. The lower surface 62f of the step portion is arranged on the lower surface 62b of the holder main body 62 in a region where only the second layer bus bar 82 is provided. The upper surface 82q of the second layer bus bar 82 comes into contact with the lower surface 62f of the step portion.

The third shaft portion 69a passes through the fixing hole 82h of the second layer bus bar 82 in the region where the first layer bus bar 81 and the second layer bus bar 82 do not overlap. The third welded portion 69b is located below the second layer bus bar 82. The third welded portion 69b extends to the outside of the fixing hole 82h of the second layer bus bar 82 when viewed from the axial direction. The third welded portion 69b has a third fixed surface 69d facing upward at a portion that extends outward with respect to the third shaft portion 69a. The third fixed surface 69d comes into contact with the lower surface 82p of the second layer bus bar 82. That is, the second layer bus bar 82 is sandwiched between the step portion 62e of the holder main body portion 62 and the third welding portion 69b. As a result, the third welded portion 69b fixes the second layer bus bar 82.

As shown as a virtual line (dashed line) in FIG. 10, an insulating sheet (insulating member) 4 may be sandwiched between the first layer bus bar 81 and the second layer bus bar 82. That is, the bus bar unit 60 may have an insulating sheet 4 interposed between the plurality of neutral point bus bars 81 and 82. The insulating sheet 4 is provided with a hole portion 4h for avoiding interference with the first welding portion 67b and the second shaft portion 68a. By providing the insulating sheet 4 between the first layer bus bar 81 and the second layer bus bar 82, the certainty of insulation between the first layer bus bar 81 and the second layer bus bar 82 can be enhanced.

In FIG. 9, the compatible bus bars 71, 72, and 73 arranged above the bus bar holder 61 are shown as hidden lines (broken lines). As shown in FIG. 9, at least a part of the neutral point bus bars 81 and 82 and the compatible bus bars 71, 72 and 73 overlap each other when viewed from the axial direction. As a result, the bus bar unit 60 can be miniaturized in the radial direction. Further, a holder main body 62 of the bus bar holder 61 is interposed between the compatible bus bars 71, 72, 73 and the neutral point bus bars 81, 82 in the axial direction. As a result, even when the compatible bus bars 71, 72, 73 and the neutral point bus bars 81, 82 are overlapped with each other when viewed from the axial direction, the compatible bus bars 71, 72, 73 and the neutral point bus bar 81 are overlapped with each other. , It is easy to secure insulation with 82.

The welded portions 67b, 68b, 69b are arranged so as to be offset from the compatible bus bars 71, 72, 73 when viewed from the axial direction. As described above, the welded portions 67b, 68b, 69b are formed by melting the resin at the tips of the shaft portions 67a, 68a, 69a. Therefore, heat is applied to the bus bar holder 61 in order to form the welded portions 67b, 68b, 69b. The portion of the holder body 62 that overlaps the welded portions 67b, 68b, 69b when viewed from the axial direction may be slightly deformed by the heat during molding of the welded portions 67b, 68b, 69b. By arranging the welded portions 67b, 68b, 69b offset from the compatible bus bars 71, 72, 73 when viewed from the axial direction, the deformation when the welded portions 67b, 68b, 69b are melted is the compatible bus bar 71, It is possible to suppress the influence on the position accuracy of 72 and 73. As a result, the positional accuracy of the compatible bus bars 71, 72, 73 can be improved.

In the present embodiment, of the plurality of compatible bus bars 71, 72, 73, the U-phase bus bar 71 having the largest length along the circumferential direction of the bus bar main bodies 71b, 72b, 73b has a diameter larger than that of the welded portions 67b, 68b. Pass inside the direction. The U-phase bus bar 71 can be shortened by extending radially inward from the welded portions 67b and 68b along the circumferential direction. As a result, the weight of the motor 1 can be reduced and the material cost of the U-phase bus bar 71 can be saved.

In the present embodiment, the plurality of compatible bus bars 71, 72, 73 are plate-shaped, and are of the vertical installation type in which the bus bar main bodies 71b, 72b, 73b are arranged in the direction orthogonal to the axial direction as the thickness direction. .. When the compatible bus bars 71, 72, 73 are vertically installed, the compatible bus bars 71, 72, 73 and the welded portions 67b, 68b, 69b are arranged so as to overlap each other when viewed from the axial direction. However, the radial dimension of the bus bar unit 60 is unlikely to increase.

In the present embodiment, one of the six welded portions 67b, 68b, and 69b is located at the base of the coil terminal 81a of the first layer bus bar 81. That is, one welded portion 67b overlaps with the coil terminal 81a in the radial direction. By arranging in this way, it is easy to secure the position accuracy of the coil terminal 81a and suppress the vibration of the coil terminal 81a. In this embodiment, the case where only one welded portion 67b is located at the base of the coil terminal 81a has been described. However, all the welded portions 67b, 68b, 69b may be located at the root of the coil terminal 81a.

The bus bar main body 81b of the first layer bus bar 81 has a wide portion 81s provided around the passage hole 81i. Similarly, the bus bar main body 82b of the second layer bus bar 82 has a wide portion 82s provided around the evacuation hole 82i. The wide portions 81s and 82s side out in the width direction in a circular shape in which the centers of the passage holes 81i or the evacuation holes 82i coincide with each other.

According to the present embodiment, by providing the wide portions 81s and 82s, the cross-sectional area of the bus bar main bodies 81b and 82b becomes small even if the neutral point bus bars 81 and 82 are provided with the passage holes 81i or the evacuation holes 82i. Never. It is possible to suppress an increase in the electrical resistance of the neutral point bus bars 81 and 82.

In the present embodiment, the stator 30 has two coil groups (coil group 7 of the first system and coil group 8 of the second system), and the bus bar unit 60 corresponds to each phase of the two systems6. A motor 1 having one compatible bus bar 71, 72, 73 and two neutral point bus bars 81, 82 corresponding to two systems has been described. However, the number of strains is not limited. For example, the stator 30 may have only three or more coil groups, and the bus bar unit 60 may have three or more systems of compatible bus bars and neutral point bus bars corresponding to the coil groups.

Next, an embodiment of an apparatus equipped with the motor 1 of the present embodiment will be described. FIG. 11 is a schematic view of an electric power steering device equipped with the motor 1 of the present embodiment. The electric power steering device 2 is mounted on the steering mechanism of the wheels of an automobile. The electric power steering device 2 is a device that reduces the steering force by hydraulic pressure. The electric power steering device 2 includes a motor 1, a steering shaft 214, an oil pump 216, and a control valve 217.

The steering shaft 214 transmits the input from the steering 211 to the axle 213 having the wheels 212. The oil pump 216 generates hydraulic pressure in the power cylinder 215 that transmits the hydraulic driving force to the axle 213. The control valve 217 controls the oil in the oil pump 216. In the electric power steering device 2, the motor 1 is mounted as a drive source for the oil pump 216. The motor 1 of the present embodiment is not limited to the electric power steering device, and may be mounted on any device.

Although the embodiments and modifications of the present invention have been described above, the configurations and combinations thereof in the embodiments and modifications are examples, and the configurations are added or omitted within a range that does not deviate from the gist of the present invention. , Replacements and other changes are possible. Moreover, the present invention is not limited to the embodiments.

Claims (11)

It includes a rotor that rotates about a central axis extending in the vertical direction, a stator that faces the rotor in the radial direction through a gap, and a bus bar unit that is provided on the upper side of the stator.
The stator has a plurality of systems of the coils, with the U-phase coil, the V-phase coil, and the W-phase coil as one coil group.
The coils of different systems are arranged symmetrically around the central axis.
The bus bar unit
It has a plurality of phase bus bars connected to leader wires drawn from the coils of each phase, and a bus bar holder for holding the plurality of the phase bus bars.
The compatible bus bar
A bus bar main body extending along the circumferential direction, a coil terminal located at one end of the bus bar main body and extending radially one side with respect to the bus bar main body and connected to the leader wire, and the bus bar main body. It has an external connection terminal located at the other end and extends upward.
The compatible bus bar has a plate shape, and at least the direction in which the bus bar main body portion is orthogonal to the axial direction is arranged as the thickness direction.
Among the plurality of compatible bus bars, the compatible bus bar having the longest length along the circumferential direction of the bus bar main body portion overlaps with at least a part of the other compatible bus bars in the radial direction and is other in the radial direction. A motor that passes on the side opposite to the direction in which the coil terminal of the compatible bus bar extends. The stator has two systems of the coil groups classified into a first system coil group and a second system coil group.
The plurality of compatible busbars include the phased busbars connected to the U-phase coil, the V-phase coil and the W-phase coil of the coil group of the first system and the coil group of the second system, respectively. The motor described in. The external connection terminals of the pair of the phase busbars connected to the coils of the same phase of the coil group of the first system and the coil group of the second system are arranged on opposite sides of the central axis. Item 2. The motor according to item 2. Of the plurality of compatible bus bars, the compatible bus bar having the longest length along the circumferential direction of the bus bar main body has a coil terminal and the external connection terminal arranged on opposite sides of the central axis. The motor according to any one of claims 1 to 3. The bus bar holder has a holding portion for holding a plurality of the compatible bus bars from the thickness direction.
Of the plurality of compatible bus bars, the compatible bus bar having the longest length along the circumferential direction of the bus bar main body is a region that does not overlap with the other compatible bus bars in the radial direction, and the bus bar main body is said to be the same. The motor according to any one of claims 1 to 4, which is held by the sandwiching portion. In the plurality of compatible bus bars, the coil terminals extend radially outward with respect to the bus bar main body.
Of the plurality of compatible bus bars, the compatible bus bar having the longest length along the circumferential direction of the bus bar main body overlaps at least a part of the other compatible bus bars in the radial direction, and the compatible bus bar of the compatible bus bar. The motor according to any one of claims 1 to 5, which is located inside in the radial direction. The bus bar unit is held by the bus bar holder and has the same number of neutral point bus bars as the number of systems of the coil group.
The neutral busbar is connected to the leader of each phase of the coil of the coil group in one system.
The neutral point bus bar includes a bus bar main body extending along a plane orthogonal to the axial direction, and a plurality of coil terminals extending radially one side with respect to the bus bar main body and connected to the leader wire. Have and
Any one of claims 1 to 6, wherein the coil terminal of the neutral point bus bar and the coil terminal of the compatible bus bar extend in the same radial direction with respect to the respective bus bar main body. The motor described in. The motor according to claim 7, wherein at least a part of the neutral point bus bar and the compatible bus bar overlap each other when viewed from the axial direction. The motor according to claim 7 or 8, wherein the neutral point bus bar has a plate shape, and at least the bus bar main body is arranged with the axial direction as the thickness direction. The stator has a plurality of teeth portions around which a coil is wound, and in each system, a plurality of U-phase coils, V-phase coils, and W-phase coils are provided, and straddle the plurality of teeth portions via crossovers. The motor according to any one of claims 1 to 9, which is provided in the above. The motor according to any one of claims 1 to 10, wherein the stator has 12 teeth portions around which a coil is wound.

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