WO2018180818A1

WO2018180818A1 - Busbar unit and motor

Info

Publication number: WO2018180818A1
Application number: PCT/JP2018/011186
Authority: WO
Inventors: 俊輔高橋
Original assignee: 日本電産株式会社
Priority date: 2017-03-31
Filing date: 2018-03-20
Publication date: 2018-10-04

Abstract

A busbar unit provided to a motor according to an aspect of the present invention is provided with: a busbar holder that is provided on one side in the axial direction of a stator annularly arranged around a center axis extending vertically; a plurality of busbars that extend along a plane orthogonal to the axial direction and that are fixed to the bus holder; and an external connection terminal that is connected to the busbars and extends upward from the busbars. The busbars are formed of a wire material. Each of the busbars has: a terminal connection part that is connected to the external connection terminal; and a leader line connection part that is connected to a leader line extending from the stator. In the busbars, the positions of at least the respective terminal connection parts and the respective leader line connection parts match one another in the axial direction. The busbars intersect one another at intersection parts when viewed in the axial direction. One of a pair of busbars intersecting each other has a retreating part which passes above the other at an intersection part. The busbar holder has a pinching part that pinches and holds the busbars.

Description

Bus bar unit and motor

The present invention relates to a bus bar unit and a motor.

A motor including a bus bar unit is known. The bus bar unit includes a bus bar to which a coil of each phase of the motor is connected. A connector for supplying power to the coil of each phase from the outside of the motor is connected to the bus bar.
For example, Patent Literature 1 describes a bus bar unit including an annular bus bar (bus ring) extending along the circumferential direction of a motor. In this bus bar unit, the bus bar is formed by bending a wire.

JP 2013-220005 A

On the other hand, in the bus bar unit, a structure is known in which the bus bar unit is miniaturized by arranging the bus bars so as to intersect each other when viewed from the axial direction. In this case, it is necessary to reliably prevent the bus bars from coming into contact with each other and being electrically short-circuited even if vibration is applied.

In view of the above circumstances, an object of the present invention is to provide a bus bar unit that can surely suppress contact between bus bars while downsizing.

One aspect of the bus bar unit of the present invention is a bus bar unit provided in a motor, the bus bar holder provided on one side in the axial direction of a stator that is annularly arranged around a central axis extending in the vertical direction, and the axial direction. A plurality of bus bars extending along an orthogonal plane and fixed to the bus bar holder; and an external connection terminal connected to the bus bar and extending upward from the bus bar. The bus bar is made of a wire. The bus bar includes a terminal connection portion connected to the external connection terminal and a lead wire connection portion connected to a lead wire extending from the stator. The plurality of bus bars have at least intersecting portions where the terminal connection portions and the lead wire connection portions coincide with each other in the axial direction and intersect each other when viewed from the axial direction. In the crossing portion, any one of the pair of bus bars crossing each other further has a retracting portion that passes over the other upper side. The bus bar holder includes a clamping portion that sandwiches and holds the bus bar.

According to one aspect of the present invention, there is provided a bus bar unit that can surely suppress contact between bus bars while reducing the size.

FIG. 1 is an exploded perspective view showing a stator and a bus bar unit of a motor according to an embodiment. FIG. 2 is a plan sectional view showing the configuration of the stator according to the embodiment. FIG. 3 is a perspective view illustrating a configuration of a stator according to an embodiment. FIG. 4 is a perspective view showing a bus bar unit according to an embodiment. FIG. 5 is a perspective view showing a bus bar holder according to an embodiment. FIG. 6 is a plan view illustrating a state where the bus bar is assembled to the bus bar holder according to the embodiment. FIG. 7 is a perspective view illustrating a state where the U-phase bus bar group is assembled to the bus bar holder according to the embodiment. FIG. 8 is a perspective view showing a state in which the U-phase bus bar group and the V-phase bus bar group are assembled to the bus bar holder according to the embodiment. FIG. 9 is a diagram illustrating an apparatus on which the motor of one embodiment is mounted.

FIG. 1 is an exploded perspective view showing a stator and a bus bar unit of a motor according to the present embodiment. FIG. 2 is a perspective view illustrating a configuration of a stator according to an embodiment. FIG. 3 is a perspective view illustrating a configuration of a stator according to an embodiment. In FIG. 1, FIG. 2, and FIG. 3, specific drawing of the coil is omitted.

As shown in FIG. 1, the motor 10 of the present embodiment includes a rotor 30 (see FIG. 2), a stator 40, a housing (not shown), and a bus bar unit 60.

As shown in FIG. 2, the rotor 30 has a shaft 31 and a rotor core 32. The shaft 31 is disposed along a central axis J that extends in the vertical direction.
In the following description, a direction parallel to the central axis J is simply referred to as “vertical direction” (axial direction), a radial direction around the central axis J is simply referred to as “radial direction”, and the central axis J is the center. The circumferential direction is simply called “circumferential direction”. Further, the upper side in FIG. 1 in the vertical direction is simply referred to as “upper side”, and the lower side in FIG. 1 in the vertical direction is simply referred to as “lower side”. Note that the upper side, the lower side, and the vertical direction are simply names for explaining the relative positional relationship between the respective parts, and do not limit the actual positional relationship and the like.

The rotor core 32 is a cylindrical member. When viewed in the vertical direction, the outer shape of the rotor core 32 is a polygon. In the present embodiment, the outer shape of the rotor core 32 is an octagon. That is, in this embodiment, the rotor core 32 is a hollow substantially octagonal column. The rotor core 32 may be a cylinder or the like. The rotor core 32 is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the vertical direction.

The rotor core 32 has a shaft through hole 32h at the center thereof. The shaft 31 is passed through the shaft through hole 32h. The shaft 31 may be fixed to the rotor core 32 by press-fitting or adhesion, or may be fixed via a resin member or the like. That is, the shaft 31 is fixed directly or indirectly to the rotor core 32. The shaft 31 may be a hollow member and is not particularly limited.
In the present embodiment, the dimension of the rotor core 32 in the vertical direction is the same as the dimension of a stator core 41 described later. However, the dimension of the rotor core 32 may be different from the dimension of the stator core 41.

A plurality of magnets 33 are arranged on each outer surface of the rotor core 32. The magnet 33 is a plate-like member extending in the vertical direction. Adjacent magnets 33 oppose each other in the circumferential direction. The magnet 33 located on one side in the circumferential direction faces the magnet 33 located on the other side in the circumferential direction with a gap in the circumferential direction.

In the present embodiment, the dimension of the magnet 33 is the same as the length of the dimension of the rotor core 32 in the vertical direction. The upper surface of the magnet 33 is flush with the upper surface of the rotor core 32. The lower surface of the magnet 33 is flush with the lower surface of the rotor core 32. That is, the vertical dimension of the magnet 33 is the same as the vertical dimension of the stator core 41. The vertical dimension of the magnet 33 may be different from the vertical dimension of the stator core 41.

The stator 40 is disposed outside the rotor 30 in the radial direction. As shown in FIGS. 2 and 3, the stator 40 is annularly arranged around the central axis J. The stator 40 is accommodated in a cylindrical housing (not shown). The stator 40 includes an annular stator core 41, an insulator 42 attached to the stator core 41, and a coil (not shown) attached to the stator core 41 via the insulator 42.

The stator core 41 is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the vertical direction. The stator core 41 has an annular core back portion 41a and a plurality of teeth 41b. In the present embodiment, the stator core 41 is a so-called divided core. The core back portion 41a is configured by connecting a plurality of fan-shaped core pieces 46 in the circumferential direction. A tooth 41 b is provided on the inner peripheral surface of each core piece 46. The teeth 41b extend radially inward from the inner peripheral surface of the core piece 46. The teeth 41b are arranged at equal intervals in the circumferential direction on the inner surface of the core back portion 41a. The teeth 41b face the magnet 33 of the rotor 30 in the radial direction. The tooth 41b has an umbrella 41c at the radially inner end of the tooth 41b. The umbrella 41c extends from the radially inner end of the teeth 41b to both sides in the circumferential direction. A gap is formed between the umbrellas 41c adjacent in the circumferential direction.
The stator core 41 is not limited to a split core, but may be another type of core such as a so-called straight core or a round core.

The material of the insulator 42 has an insulating property. In this embodiment, the material of the insulator 42 is an insulating resin. The insulator 42 covers at least a part of the outer peripheral surface of the tooth 41b.
The insulator 42 has a flange portion 42 f on the upper side of the stator 40. The flange portion 42 f is located on the radially outer side of the insulator 42. The flange portion 42f has a predetermined height in the vertical direction and extends in the circumferential direction.
The material of the insulator 42 is not limited to resin as long as it has insulating properties, and other materials may be used.

The motor 10 of the present embodiment is a so-called three-phase motor having three phases of U phase, V phase, and W phase. The coil (not shown) has four U-phase coils, four V-phase coils, and four W-phase coils. In the present embodiment, the coil connection method is a so-called Y connection method. The U-phase coil, the V-phase coil, and the W-phase coil are arranged adjacent to each other in this order in the circumferential direction. In the present embodiment, there are four sets of coils including the U-phase coil, the V-phase coil, and the W-phase coil.

A coil (not shown) has a coil wire wound around a tooth 41 b via an insulator 42.
As shown in FIG. 3, each coil (U phase coil, V phase coil, W phase coil) has a first lead wire 44 and a second lead wire 45. The first lead line 44 and the second lead line 45 extend upward. In each coil, the first lead wire 44 is located radially outside the second lead wire 45. In each coil, the second lead wire 45 extends longer in the vertical direction than the first lead wire 44. In the present embodiment, one first lead wire 44 and one second lead wire 45 are drawn from each coil. In the present embodiment, the number of teeth 41b is twelve. Therefore, the number of coils 43 is twelve. The number of the first lead lines 44 and the second lead lines 45 is twelve.

The first lead wire of each set of U-phase coil, V-phase coil, and W-phase coil is electrically connected by a neutral point bus bar 48. The neutral point bus bar 48 is held by the flange portion 42 f of the insulator 42. The neutral point bus bar 48 is formed by bending a conductive metal wire. In the present embodiment, four neutral point bus bars 48 are arranged at equal intervals in the circumferential direction.

Each neutral point bus bar 48 includes a bus bar main body 48a and a coil wire holding portion 48b. The bus bar main body 48a has an arc shape extending in the circumferential direction when viewed from the vertical direction.
The coil wire holding portions 48b are provided at a plurality of locations spaced in the circumferential direction of the bus bar main body 48a. In the present embodiment, the coil wire holding portions 48b are provided at four locations on the bus bar main body 48a. Each coil wire holding portion 48b is U-shaped and opens outward in the radial direction. Each coil wire holding portion 48b has a pair of extending portions 48c, 48c and a connecting portion 48d. The pair of extending portions 48c, 48c extend radially inward from the bus bar body 48a. The connecting portion 48d connects the radially inner ends of the pair of extending portions 48c, 48c. The connecting portion 48d has a semicircular arc shape.

Each neutral point bus bar 48 is electrically connected to the first lead wire 44 of each set of U-phase coil, V-phase coil, and W-phase coil. Each of the first lead wire 44U of the U-phase coil, the first lead wire 44V of the V-phase coil, and the first lead wire 44W of the W-phase coil has a tip located inside the coil wire holding portion 48b. In this way, the ends of the three

first lead wires

44U, 44V, 44W drawn from the U-phase coil, V-phase coil, and W-phase coil of each set are electrically connected to one neutral point bus bar 48. Connected. Each coil wire holding portion 48b and the first lead wire 44 are fixed by caulking. Furthermore, each coil wire holding portion 48b and the end portion of the first lead wire 44 are firmly fixed by laser welding or the like.

FIG. 4 is a perspective view showing a bus bar unit according to an embodiment.
As shown in FIG. 4, the bus bar unit 60 has a substantially disk shape that expands in the radial direction as a whole. The bus bar unit 60 includes a bus bar 70 and a bus bar holder 61.

The bus bar holder 61 is provided on one side of the stator 40 in the vertical direction. In the present embodiment, the bus bar holder 61 is disposed on the upper side of the stator 40.
The bus bar holder 61 is made of an insulating material. In this embodiment, the material of the bus bar holder 61 is an insulating resin. However, the material of the bus bar holder 61 may be another insulating material.

FIG. 5 is a perspective view showing a bus bar holder according to an embodiment.
As shown in FIG. 5, the bus bar holder 61 is a substantially plate-shaped member. When viewed from the vertical direction, the bus bar holder 61 has a substantially circular outer shape. The bus bar holder 61 has a rotationally symmetric shape every 120 ° with the central axis J as the center. The bus bar holder 61 has a through hole 61h penetrating in the vertical direction at the center. The bus bar holder 61 is fitted inside the housing (not shown) in the radial direction.

The bus bar holder 61 has a lead wire insertion hole 62. The lead wire insertion hole 62 penetrates the bus bar holder 61 in the vertical direction. A plurality of lead wire insertion holes 62 are provided at intervals in the circumferential direction. In the present embodiment, the number of lead wire insertion holes 62 is the same as the number of second lead wires 45. That is, the number of lead wire insertion holes 62 is twelve.

The bus bar holder 61 has a clamping part 66 and a terminal holding part 69 on its upper surface.
The clamping portion 66 is provided on the radially outer side of the through hole 61 h of the bus bar holder 61. The clamping portion 66 is provided on the radially inner side than the lead wire insertion hole 62. A plurality of sandwiching portions 66 are provided with a circumferential direction therebetween. In the present embodiment, six sandwiching portions 66 are provided at equal intervals in the circumferential direction. Each clamping part 66 has a pair of claw members 66a. Each claw member 66a extends upward. The pair of claw members 66a oppose each other with a gap in the radial direction. The pair of claw members 66a have protrusions (not shown) that protrude in directions in which the claw members 66a are opposed to each other at their respective distal ends. The interval between the protrusions of the pair of claw members 66a is narrower than the outer diameter of the wire rod 77 of the bus bar 70 described later. Thereby, the clamping part 66 hold | maintains the wire 77 of the bus-bar 70 by a snap fit.

The terminal holding portion 69 is provided on the outer peripheral portion of the bus bar holder 61. A plurality of terminal holding portions 69 are provided in the circumferential direction. In the present embodiment, three terminal holding portions 69 are provided at intervals in the circumferential direction. Each terminal holding portion 69 has a pair of

columnar members

69a and 69b. The pair of

columnar members

69a and 69b oppose each other with a gap in the radial direction. The

columnar members

69a and 69b extend upward from the upper surface of the bus bar holder 61, respectively. The

columnar members

69a and 69b have holding

grooves

69m and 69n. The holding

grooves

69m and 69n are provided on the inner side in the facing direction in which the

columnar members

69a and 69b face each other. The holding

grooves

69m and 69n extend in the vertical direction. The upper ends of the holding

grooves

69m and 69n open upward at the upper ends of the

columnar members

69a and 69b.

As shown in FIG. 1, the bus bar holder 61 is located above the first lead wire 44 extending upward from each coil of the stator 40. The second lead wire 45 passes through the lead wire insertion hole 62 and projects to the upper surface side of the bus bar holder 61.

FIG. 6 is a plan view illustrating a state where the bus bar is assembled to the bus bar holder according to the embodiment.
As shown in FIGS. 5 and 6, the bus bar 70 is located above the bus bar holder 61. The bus bar 70 is fixed to the bus bar holder 61. The bus bar 70 includes a U-phase bus bar group (first type bus bar) 70U, a V-phase bus bar group (second type bus bar) 70V, and a W-phase bus bar group (third type bus bar) 70W. Have.
The U-phase bus bar group 70 U includes a U-phase first bus bar 71 and a U-phase second bus bar 72. The V-phase bus bar group 70 V includes a V-phase first bus bar 73 and a V-phase second bus bar 74. The W-phase bus bar group 70 W includes a W-phase first bus bar 75 and a W-phase second bus bar 76.

The U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are each orthogonal to the vertical direction. It extends along the surface to be.

The U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are each a wire having a circular cross section. 77. The wire 77 is made of a conductive metal material. The U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76, respectively, It is formed by bending with a forming machine. The forming machine is configured to bend the wire rod 77 at a predetermined position while feeding it. The forming machine can preset the bending position, the bending direction, the curvature of the bent portion, and the like of the wire 77. Thus, the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are formed by the forming machine. , Automatically manufactured based on preset programming.

FIG. 7 is a perspective view illustrating a state where the U-phase bus bar group is assembled to the bus bar holder according to the embodiment.
As shown in FIGS. 6 and 7, the U-phase first bus bar 71 includes a first straight portion 71s, a second straight portion 71t, a terminal connection portion 71c, and a first lead wire connection portion (lead wire). A connecting portion) 71a and a second lead wire connecting portion (leader connecting portion) 71b.

The first straight line portion 71s is provided between the first lead wire connection portion 71a and the second lead wire connection portion 71b. The first straight line portion 71s connects the first lead wire connection portion 71a and the second lead wire connection portion 71b. The first straight portion 71s is linear when viewed from the up and down direction. The first straight portion 71s extends in a direction orthogonal to the radial direction.

The second straight line portion 71t is provided between the second lead wire connecting portion 71b and the terminal connecting portion 71c. The second straight line portion 71t extends from a fourth end portion 71i described later. The second straight portion 71t is linear when viewed from the up-down direction. The second straight line portion 71t is parallel to the first straight line portion 71s. The second straight portion 71t is arranged so as to be shifted radially inward with respect to the virtual line L extending the first straight portion 71s.

The terminal connection portion 71 c is located at one end of the U-phase first bus bar 71. The terminal connecting portion 71c is bent about 90 ° radially inward from the end of the second straight portion 71t, and extends perpendicular to the radial direction. Terminal connection portion 71 c is connected to U-phase external connection terminal 81.

The first lead wire connecting portion 71 a is located at the other end of the U-phase first bus bar 71. The first lead wire connecting portion 71a has a pair of extending portions 71v and a bending portion 71w. The pair of extending portions 71v extend in parallel to each other along the radial direction. The pair of extending portions 71v are disposed on both sides of the lead bar insertion hole 62 of the bus bar holder 61. The curved portion 71w connects the radially outer ends of the pair of extending portions 71v. The curved portion 71 w is in a semicircular arc shape and is curved along the inner peripheral edge of the lead wire insertion hole 62. Thus, the 1st leader line connection part 71a is U shape opened to radial inside. The first lead wire connecting portion 71a has an opening 71p that opens radially inward. The first lead wire connecting portion 71 a is connected to a second lead wire 45 that protrudes upward from the bus bar holder 61. The second lead wire 45 is located inside the first lead wire connecting portion 71a. The second lead wire 45 is joined to the first lead wire connecting portion 71a by laser welding or the like.

The first lead wire connecting portion 71a further includes a first end portion 71d and a second end portion 71e. The first end 71d is connected to the end of the first straight line 71s. The second end 71e is located on the opposite side of the first end 71d. The second end portion 71e is provided with an extending portion 71f extending in a direction away from the opening 71p of the first lead wire connecting portion 71a. The extending portion 71f extends in a direction orthogonal to the radial direction.

The second lead wire connecting portion 71b is located between the terminal connecting portion 71c and the first lead wire connecting portion 71a. The second lead wire connecting portion 71b is located between the second straight portion 71t and the first straight portion 71s. The second lead wire connecting portion 71b has the same shape as the first lead wire connecting portion 71a. That is, the second lead wire connecting portion 71b has a pair of extending portions 71v and a bending portion 71w. Thus, the 2nd leader line connection part 71b is U shape opened to radial direction inner side. The second lead wire connecting portion 71b has an opening 71p that opens radially inward.

The second lead wire connecting portion 71 b is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connecting portion 71b. The second lead wire 45 is joined to the second lead wire connecting portion 71b by laser welding or the like.

The second lead wire connecting portion 71b further includes a third end portion 71h and a fourth end portion 71i. The third end portion 71h is connected to the end portion of the first straight portion 71s. The fourth end portion 71i is located on the opposite side of the third end portion 71h. The fourth end portion 71i is connected to the end portion of the second straight line portion 71t.

The U-phase first bus bar 71 is held by the holding portion 66 in the first straight portion 71s. In other words, the U-phase first bus bar 71 is held by the holding portion 66 between the first lead wire connecting portion 71a and the second lead wire connecting portion 71b. The first lead wire connecting portion 71a and the second lead wire connecting portion 71b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction.

The U-phase second bus bar 72 includes a first straight part 72s, a second straight part 72t, a terminal connection part 72c, a first lead line connection part (lead line connection part) 72a, and a second lead Line connection part (leader line connection part) 72b.
The first straight line portion 72s is provided between the first lead wire connection portion 72a and the second lead wire connection portion 72b. The first straight line portion 72s connects the first lead wire connection portion 72a and the second lead wire connection portion 72b. The first straight portion 72s is linear when viewed from the up-down direction. The first straight portion 72s extends in a direction orthogonal to the radial direction.

The second straight line portion 72t is provided between the second lead wire connecting portion 72b and the terminal connecting portion 72c. The second straight portion 72t extends from a fourth end 72i described later. The second straight portion 72t is linear when viewed from the up-down direction. The second straight line portion 72t is parallel to the first straight line portion 72s. The second straight line portion 72t is arranged to be shifted radially inward from a virtual line L extending the first straight line portion 72s.

The terminal connection 72 c is located at one end of the U-phase second bus bar 72. The terminal connection portion 72c is bent about 90 ° radially inward from the end of the second straight portion 72t, and extends perpendicular to the radial direction. The terminal connection portion 72 c is arranged so as to be shifted radially outward with respect to the terminal connection portion 71 c of the U-phase first bus bar 71. Terminal connecting portion 72 c is arranged in parallel with terminal connecting portion 71 c of U-phase first bus bar 71. Terminal connection 72 c is connected to U-phase external connection terminal 81.

The first lead wire connecting portion 72 a is located at the other end of the U-phase second bus bar 72. The 1st leader line connection part 72a has the same shape as the 1st leader line connection part 71a. The first lead wire connecting portion 72a has a U-shape that opens radially inward. The first lead wire connecting portion 72a has an opening 72p that opens radially inward. The first lead wire connecting portion 72 a is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the first lead wire connecting portion 72a. The second lead wire 45 is joined to the first lead wire connecting portion 72a by laser welding or the like.

The first lead wire connection portion 72a further includes a first end portion 72d and a second end portion 72e. The first end 72d is connected to the end of the first straight portion 72s. The second end 72e is located on the opposite side of the first end 72d. The second end portion 72e is provided with an extending portion 72f extending in a direction away from the opening 72p of the first lead wire connecting portion 72a. The extending part 72f extends in a direction orthogonal to the radial direction.

The second lead wire connecting portion 72b is located between the terminal connecting portion 72c and the first lead wire connecting portion 72a. The second lead wire connecting portion 72b is located between the second straight portion 72t and the first straight portion 72s. The second lead wire connecting portion 72b has the same shape as the second lead wire connecting portion 71b. The second lead wire connecting portion 72b has a U-shape that opens radially inward. The second lead wire connecting portion 72b has an opening 72p that opens radially inward. The second lead wire connecting portion 72 b is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connecting portion 72b. The second lead wire 45 is joined to the second lead wire connecting portion 72b by laser welding or the like.

The second lead wire connecting portion 72b further includes a third end portion 72h and a fourth end portion 72i. The third end 72h is connected to the end of the first straight portion 72s. The fourth end 72i is located on the opposite side of the third end 72h. The fourth end 72i is connected to the end of the second straight part 72t.

The U-phase second bus bar 72 is held by the sandwiching portion 66 at the first straight portion 72s. In other words, the U-phase second bus bar 72 is held by the holding portion 66 between the first lead wire connection portion 72a and the second lead wire connection portion 72b. U-phase first bus bar 71 and U-phase second bus bar 72 are held along the upper surface of bus bar holder 61. The U-phase first bus bar 71 and the U-phase second bus bar 72 may be spaced from the upper surface of the bus bar holder 61 or may be in contact with the upper surface of the bus bar holder 61.

The U-phase first bus bar 71 and the U-phase second bus bar 72 include the first straight line portion 71s, the terminal connection portion 71c, the first lead wire connection portion 71a, the first straight line portion 72s, and the terminal connection. The positions in the vertical direction coincide with each other including the portion 72c and the first lead wire connecting portion 72a.
The first lead wire connecting portion 72a and the second lead wire connecting portion 72b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction. Furthermore, the 1st leader line connection part 72a and the 2nd leader line connection part 72b are the 1st leader line connection part 71a and the 2nd leader line connection part 71b of the U-phase 1st bus bar 71 from the up-down direction. They are arranged on a concentric circle with the central axis J as the center.

In the U-phase first bus bar 71 and the U-phase second bus bar 72, the first straight portion 71s and the first straight portion 72s are located on the opposite sides with the central axis J interposed therebetween. Further, in the U-phase first bus bar 71 and the U-phase second bus bar 72, the first straight portion 71s and the first straight portion 72s extend in parallel.
The U-phase first bus bar 71 and the U-phase second bus bar 72 extend from the U-phase external connection terminal 81 to be connected to the opposite sides in the circumferential direction.
Thereby, the magnetic field generated by the U-phase first bus bar 71 and the magnetic field generated by the U-phase second bus bar 72 are canceled out, and the influence on the outside is suppressed.

FIG. 8 is a perspective view showing a state in which the U-phase bus bar group and the V-phase bus bar group are assembled to the bus bar holder according to the embodiment.
As shown in FIGS. 6 and 8, the V-phase first bus bar 73 includes a first straight line portion 73s, a second straight line portion 73t, a terminal connection portion 73c, and a first lead wire connection portion (lead wire). A connecting portion) 73a and a second lead wire connecting portion (leader connecting portion) 73b.
The first straight line portion 73s is provided between the first lead wire connection portion 73a and the second lead wire connection portion 73b. The first straight line portion 73s connects the first lead wire connection portion 73a and the second lead wire connection portion 73b. The first straight line portion 73s is linear when viewed from the up-down direction. The first straight portion 73s extends in a direction orthogonal to the radial direction.

The second straight line portion 73t is provided between the second lead wire connecting portion 73b and the terminal connecting portion 73c. The second straight line portion 73t extends from a fourth end portion 73i described later. The second straight line portion 73t is straight when viewed from the up-down direction. The second straight line portion 73t is parallel to the first straight line portion 73s. The second straight line portion 73t is arranged to be shifted radially inward from a virtual line L extending the first straight line portion 73s.

The terminal connection part 73 c is located at one end of the V-phase first bus bar 73. The terminal connecting portion 73c is bent about 90 ° radially inward from the end of the second straight portion 73t, and extends perpendicular to the radial direction. Terminal connection portion 73 c is connected to V-phase external connection terminal 82.

First lead wire connecting portion 73 a is located at the other end of V-phase first bus bar 73. The first lead wire connecting portion 73a has the same shape as the first lead wire connecting portion 71a. The first lead wire connecting portion 73a has a U shape that opens radially inward.
The first lead wire connecting portion 73 a is connected to the second lead wire 45 that protrudes upward from the bus bar holder 61. The second lead wire 45 is located inside the first lead wire connecting portion 73a. The second lead wire 45 is joined to the first lead wire connecting portion 73a by laser welding or the like.

The first lead wire connecting portion 73a further includes a first end portion 73d and a second end portion 73e. The first end 73d is connected to the end of the first straight portion 73s. The second end 73e is located on the opposite side of the first end 73d. The second end portion 73e is provided with an extending portion 73f extending in a direction away from the opening 73p of the first lead wire connecting portion 73a. The extending part 73f extends in a direction orthogonal to the radial direction.

The second lead wire connection portion 73b is located between the terminal connection portion 73c and the first lead wire connection portion 73a. The second lead wire connecting portion 73b is located between the second straight portion 73t and the first straight portion 73s. The second lead wire connecting portion 73b has the same shape as the second lead wire connecting portion 71b. The second lead wire connecting portion 73b has a U-shape that opens radially inward. The second lead wire connecting portion 73b has an opening 73p that opens radially inward.
The second lead wire connecting portion 73 b is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connecting portion 73b. The second lead wire 45 is joined to the second lead wire connecting portion 73b by laser welding or the like.

The second lead wire connection portion 73b further includes a third end portion 73h and a fourth end portion 73i. The third end portion 73h is connected to the end portion of the first straight portion 73s. The fourth end 73i is located on the opposite side of the third end 73h. The fourth end portion 73i is connected to the end portion of the second straight line portion 73t.

The V-phase first bus bar 73 is held by the sandwiching portion 66 in the first straight portion 73s. In other words, the V-phase first bus bar 73 is held by the holding portion 66 between the first lead wire connecting portion 73a and the second lead wire connecting portion 73b.
The first leader line connecting portion 73a and the second leader line connecting portion 73b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction.

The V-phase first bus bar 73 has an intersection J1 that intersects with a part of the U-phase second bus bar 72 when viewed from above and below. The V-phase first bus bar 73 has a retracting portion 93 at the intersection J1. The retracting portion 93 passes above the intersecting U-phase second bus bar 72. The retracting portion 93 passes above the first straight portion 72 s of the U-phase second bus bar 72. The retracting portion 93 is provided in the first straight portion 73 s of the V-phase first bus bar 73. The retracting portion 93 is provided on the second lead wire connecting portion 73b side in the first straight portion 73s. The retracting portion 93 has a pair of leg portions 93a and a bridge portion 93b. The pair of leg portions 93a extends upward from the first straight portion 73s and the second lead wire connecting portion 73b. The bridge part 93b connects the upper ends of the pair of leg parts 93a. The bridge portion 93b is located on the upper side with respect to the first straight portion 73s. The bridge portion 93b extends in parallel with the first straight portion 73s. In this way, the retracting portion 93 straddles the upper side of the first straight portion 72 s of the U-phase second bus bar 72. The retracting portion 93 is disposed with a space between the first straight portion 72 s of the U-phase second bus bar 72.

The V-phase second bus bar 74 includes a first straight portion 74s, a second straight portion 74t, a terminal connection portion 74c, a first lead wire connection portion (lead wire connection portion) 74a, and a second lead Line connection part (leader line connection part) 74b.
The first straight line portion 74s is provided between the first lead wire connection portion 74a and the second lead wire connection portion 74b. The first straight line portion 74s connects the first lead wire connecting portion 74a and the second lead wire connecting portion 74b. The first straight portion 74s is linear when viewed from the up-down direction. The first straight portion 74s extends in a direction orthogonal to the radial direction.

The second straight line portion 74t is provided between the second lead wire connecting portion 74b and the terminal connecting portion 74c. The second straight line portion 74t extends from a fourth end portion 74i described later. The second straight portion 74t is linear when viewed from the up-down direction. The second straight line portion 74t is parallel to the first straight line portion 74s. The second straight line portion 74t is arranged to be shifted radially inward from a virtual line L extending the first straight line portion 74s.

The terminal connection portion 74 c is located at one end of the V-phase second bus bar 74. The terminal connecting portion 74c is bent about 90 ° radially inward from the end of the second straight portion 74t, and extends perpendicular to the radial direction. The terminal connection portion 74 c is disposed on the terminal connection portion 73 c of the V-phase first bus bar 73 so as to be shifted radially outward. Terminal connection portion 74 c is arranged in parallel with terminal connection portion 73 c of V-phase first bus bar 73. Terminal connection portion 74 c is connected to V-phase external connection terminal 82.

The first lead wire connecting portion 74 a is located at the other end of the V-phase second bus bar 74. The first lead wire connecting portion 74a has the same shape as the first lead wire connecting portion 71a. The first lead wire connecting portion 74a has a U shape that opens radially inward. The first lead wire connecting portion 74a has an opening 74p that opens radially inward. The first lead wire connecting portion 74 a is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the first lead wire connecting portion 74a. The second lead wire 45 is joined to the first lead wire connecting portion 74a by laser welding or the like.

The first lead wire connecting portion 74a further includes a first end portion 74d and a second end portion 74e. The first end 74d is connected to the end of the first straight portion 74s. The second end portion 74e is located on the opposite side of the first end portion 74d. The second end portion 74e is provided with an extending portion 74f extending in a direction away from the opening 74p of the first lead wire connecting portion 74a. The extending part 74f extends in a direction orthogonal to the radial direction.

The second lead wire connection portion 74b is located between the terminal connection portion 74c and the first lead wire connection portion 74a. The second lead wire connecting portion 74b is located between the second straight portion 74t and the first straight portion 74s. The second lead wire connecting portion 74b has the same shape as the second lead wire connecting portion 71b. The second lead wire connecting portion 74b has a U-shape that opens radially inward. The second lead wire connecting portion 74b has an opening 74p that opens radially inward.
The second lead wire connecting portion 74 b is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connecting portion 74b. The second lead wire 45 is joined to the second lead wire connecting portion 74b by laser welding or the like.

The second lead wire connection portion 74b further includes a third end portion 74h and a fourth end portion 74i. The third end portion 74h is connected to the end portion of the first straight portion 74s. The fourth end 74i is located on the opposite side of the third end 74h. The fourth end 74i is connected to the end of the second straight portion 74t.

The V-phase second bus bar 74 has an intersection J2 that intersects with a part of the U-phase first bus bar 71 when viewed from the up-down direction. The V-phase second bus bar 74 has a retracting portion 94 at the intersection J2. The retracting portion 94 passes above the intersecting U-phase first bus bar 71. The retracting portion 94 passes above the first straight portion 71 s of the U-phase first bus bar 71. The retracting portion 94 is provided in the first straight portion 74 s of the V-phase second bus bar 74. The retracting portion 94 is provided on the first lead wire connecting portion 74a side in the first straight portion 74s. The retracting portion 94 has the same shape as the retracting portion 94. The retracting portion 94 straddles the upper side of the first straight portion 71 s of the U-phase first bus bar 71. The retracting portion 94 is arranged with an interval between the first straight portion 71 s of the U-phase first bus bar 71.

The V-phase second bus bar 74 is held by the sandwiching portion 66 in the first straight portion 74s. In other words, the V-phase second bus bar 74 is held by the holding portion 66 between the first lead wire connecting portion 74a and the second lead wire connecting portion 74b. The V-phase first bus bar 73 and the V-phase second bus bar 74 are arranged at a 120 ° angle different from the U-phase first bus bar 71 and the U-phase second bus bar 72 in the circumferential direction.

The V-phase first bus bar 73 and the V-phase second bus bar 74 held by the clamping unit 66 are arranged along the upper surface of the bus bar holder 61. The V-phase first bus bar 73 and the V-phase second bus bar 74 may be spaced from the upper surface of the bus bar holder 61 or may be in contact with the upper surface of the bus bar holder 61.
The V-phase first bus bar 73 and the V-phase second bus bar 74 include a first straight line portion 73s, a second straight line portion 73t, a terminal connection portion 73c, a first lead wire connection portion 73a, and a second Of the lead wire connecting portion 73b, the first straight portion 74s, the second straight portion 74t, the terminal connecting portion 74c, the first lead wire connecting portion 74a, and the second lead wire connecting portion 74b. Coincides with the U-phase first bus bar 71 and the U-phase second bus bar 72. In other words, in the V-phase first bus bar 73 and the V-phase second bus bar 74, the vertical positions of portions other than the retracting

portions

93 and 94 coincide with the U-phase first bus bar 71 and the U-phase second bus bar 72.

The first lead wire connecting portion 74a and the second lead wire connecting portion 74b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction. Further, the first lead wire connecting portion 74a and the second lead wire connecting portion 74b are connected to the first lead wire connecting portion 73a and the second lead wire connecting portion 73b of the V-phase first bus bar 73 from the vertical direction. They are arranged on a concentric circle with the central axis J as the center.

In the V-phase first bus bar 73 and the V-phase second bus bar 74, the first straight line portion 73s and the first straight line portion 74s are located on the opposite side with the central axis J interposed therebetween. Further, in the V-phase first bus bar 73 and the V-phase second bus bar 74, the first straight portion 73s and the first straight portion 74s extend in parallel.
Further, the V-phase first bus bar 73 and the V-phase second bus bar 74 extend from the connected V-phase external connection terminal 82 to opposite sides in the circumferential direction.
As a result, the magnetic field generated by the V-phase first bus bar 73 and the magnetic field generated by the V-phase second bus bar 74 cancel each other, and the influence on the outside is suppressed.

As shown in FIG. 6, the W-phase first bus bar 75 includes a first straight part 75s, a second straight part 75t, a terminal connection part 75c, and a first lead line connection part (lead line connection part). 75a and a second leader line connecting part (leader line connecting part) 75b.
The first straight line portion 75s is provided between the first lead wire connection portion 75a and the second lead wire connection portion 75b. The first straight portion 75s connects the first lead wire connecting portion 75a and the second lead wire connecting portion 75b. The first straight portion 75s is linear when viewed from the up and down direction. The first straight portion 75s extends in a direction orthogonal to the radial direction.

The second straight line portion 75t is provided between the second lead wire connecting portion 75b and the terminal connecting portion 75c. The second straight portion 75t extends from a fourth end portion 75i described later. The second straight portion 75t is linear when viewed from the up-down direction. The second straight part 75t is parallel to the first straight part 75s. The second straight line portion 75t is arranged to be shifted radially inward from the virtual line L extending the first straight line portion 75s.

The terminal connection portion 75 c is located at one end of the W-phase first bus bar 75. The terminal connecting portion 75c is bent about 90 ° radially inward from the end of the second straight portion 75t, and extends perpendicular to the radial direction. Terminal connection portion 75 c is connected to W-phase external connection terminal 83.

First lead wire connecting portion 75 a is located at the other end of W-phase first bus bar 75. The first lead wire connecting portion 75a has the same shape as the first lead wire connecting portion 71a. The first lead wire connecting portion 75a has a U shape that opens radially inward. The first lead wire connecting portion 75a has an opening 75p that opens radially inward.
The first lead wire connecting portion 75 a is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the first lead wire connecting portion 75a. The second lead wire 45 is joined to the first lead wire connecting portion 75a by laser welding or the like.

The first lead wire connecting portion 75a further includes a first end portion 75d and a second end portion 75e. The first end 75d is connected to the end of the first straight portion 75s. The second end portion 75e is located on the opposite side of the first end portion 75d. The second end portion 75e is provided with an extending portion 75f extending in a direction away from the opening 75p of the first lead wire connecting portion 75a. The extending portion 75f extends in a direction orthogonal to the radial direction.

The second lead wire connection portion 75b is located between the terminal connection portion 75c and the first lead wire connection portion 75a. The second lead wire connecting portion 75b is located between the second straight portion 75t and the first straight portion 75s. The second lead wire connecting portion 75b has the same shape as the second lead wire connecting portion 71b. The 2nd leader line connection part 75b is U-shape opened to radial direction inner side. The second lead wire connecting portion 75b has an opening 75p that opens radially inward.
The second lead wire connecting portion 75 b is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connecting portion 75b. The second lead wire 45 is joined to the second lead wire connecting portion 75b by laser welding or the like.

The second lead wire connection portion 75b further includes a third end portion 75h and a fourth end portion 75i. The third end portion 75h is connected to the end portion of the first straight portion 75s. The fourth end 75i is located on the opposite side of the third end 75h. The fourth end 75i is connected to the end of the second straight part 75t.

The W-phase first bus bar 75 is held by the holding portion 66 in the first straight portion 75s. In other words, the W-phase first bus bar 75 is held by the holding portion 66 between the first lead wire connecting portion 75a and the second lead wire connecting portion 75b.
The first lead wire connecting portion 75a and the second lead wire connecting portion 75b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction.

W-phase first bus bar 75 has intersections J3 and J4.
The intersection J3 intersects with a part of the U-phase second bus bar 72 when viewed in the vertical direction. The W-phase first bus bar 75 has a retracting portion 93A at the intersection J3. The retracting portion 93A passes above the intersecting U-phase second bus bar 72. The retracting portion 93 A passes above the first straight portion 72 s of the U-phase second bus bar 72. The retracting portion 93 A is provided in the first straight portion 75 s of the W-phase first bus bar 75. The retracting portion 93A is provided on the first lead wire connecting portion 75a side in the first straight portion 75s.
The intersecting portion J4 intersects with a part of the V-phase second bus bar 74 when viewed from the vertical direction. The W-phase first bus bar 75 has a retracting portion 93B at the intersection J4. The retracting portion 93B passes above the intersecting V-phase second bus bar 74. The retracting portion 93B passes above the first straight portion 74s of the V-phase second bus bar 74. The retracting portion 93B is provided in the first straight portion 75s of the W-phase first bus bar 75. The retracting portion 93B is provided on the second lead wire connecting portion 75b side in the first straight portion 75s.

The retracting

portions

93A and 93B have the same shape as the retracting portion 93. The retreating portions 93 A and 93 B straddle the upper side of the first straight portion 72 s of the U-phase second bus bar 72 and the first straight portion 74 s of the V-phase second bus bar 74. The retracting portion 93A is disposed with a space between the first straight portion 72s of the U-phase second bus bar 72 and the first straight portion 74s of the V-phase second bus bar 74.

The W-phase second bus bar 76 includes a first straight portion 76s, a second straight portion 76t, a terminal connection portion 76c, a first lead wire connection portion (lead wire connection portion) 76a, and a second lead wire. Line connection part (leader line connection part) 76b.
The first straight portion 76s is provided between the first lead wire connecting portion 76a and the second lead wire connecting portion 76b. The first straight portion 76s connects the first lead wire connecting portion 76a and the second lead wire connecting portion 76b. The first straight portion 76s is linear when viewed in the up-down direction. The first straight portion 76s extends in a direction orthogonal to the radial direction.

The second straight line portion 76t is provided between the second lead wire connecting portion 76b and the terminal connecting portion 76c. The second straight portion 76t extends from a fourth end portion 76i described later. The second straight portion 76t is linear when viewed from the up-down direction. The second straight portion 76t is parallel to the first straight portion 76s. The second straight portion 76t is arranged to be shifted radially inward from a virtual line L extending the first straight portion 76s.

The terminal connection portion 76 c is located at one end of the W-phase second bus bar 76. The terminal connecting portion 76c is bent about 90 ° radially inward from the end of the second straight portion 76t, and extends perpendicular to the radial direction. The terminal connection portion 76 c is arranged on the terminal connection portion 75 c of the W-phase first bus bar 75 so as to be shifted radially outward. Terminal connecting portion 76 c is arranged in parallel with terminal connecting portion 75 c of W-phase first bus bar 75. Terminal connection portion 76 c is connected to W-phase external connection terminal 83.

The first lead wire connecting portion 76 a is located at the other end of the W-phase second bus bar 76. The first lead wire connecting portion 76 a is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The first lead wire connecting portion 76a has the same shape as the first lead wire connecting portion 71a. The first lead wire connecting portion 76a has a U shape that opens radially inward. The first lead wire connecting portion 76a has an opening 76p that opens radially inward. The second lead wire 45 is located inside the first lead wire connecting portion 76a. The second lead wire 45 is joined to the first lead wire connecting portion 76a by laser welding or the like.

The first lead wire connecting portion 76a further includes a first end portion 76d and a second end portion 76e. The first end 76d is connected to the end of the first straight portion 76s. The second end portion 76e is located on the opposite side of the first end portion 76d. The second end portion 76e is provided with an extending portion 76f extending in a direction away from the opening 76p of the first lead wire connecting portion 76a. The extending portion 76f extends in a direction orthogonal to the radial direction.

The second lead wire connecting portion 76b is located between the terminal connecting portion 76c and the first lead wire connecting portion 76a. The second lead wire connecting portion 76b is located between the second straight portion 76t and the first straight portion 76s. The second lead wire connecting portion 76b has the same shape as the second lead wire connecting portion 71b. The 2nd leader line connection part 76b is U-shape opened to radial direction inner side. The second lead wire connecting portion 76b has an opening 76p that opens radially inward.
The second lead wire connecting portion 76 b is connected to the second lead wire 45 protruding upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connecting portion 76b. The second lead wire 45 is joined to the second lead wire connecting portion 76b by laser welding or the like.

The second lead wire connecting portion 76b further includes a third end portion 76h and a fourth end portion 76i. The third end portion 76h is connected to the end portion of the first straight portion 76s. The fourth end portion 76i is located on the opposite side of the third end portion 76h. The fourth end portion 76i is connected to the end portion of the second straight portion 76t.

The W-phase second bus bar 76 has intersections J5 and J6.
The intersecting portion J5 intersects with a part of the V-phase first bus bar 73 when viewed in the vertical direction. The W-phase second bus bar 76 has a retracting portion 94A at the intersection J5. The retracting portion 94A passes above the intersecting V-phase first bus bar 73. The retracting portion 94A passes above the first straight portion 73s of the V-phase first bus bar 73. The retracting portion 94A is provided on the first straight portion 76s of the W-phase second bus bar 76. The retracting portion 94A is provided on the first lead wire connecting portion 76a side in the first straight portion 76s.
The intersecting portion J6 intersects with a part of the U-phase first bus bar 71 when viewed from the vertical direction. The W-phase second bus bar 76 has a retracting portion 94B at the intersection J6. The retracting portion 94B passes above the intersecting U-phase first bus bar 71. The retracting portion 94B passes above the first straight portion 71s of the U-phase first bus bar 71. The retracting portion 94B is provided in the first straight portion 76s of the W-phase second bus bar 76. The retracting portion 94B is provided on the second lead wire connecting portion 76b side in the first straight portion 76s.

The retracting

portions

94A and 94B have the same shape as the retracting portion 93. The retracting

portions

94A and 94B straddle the upper side of the first straight portion 73s of the V-phase first bus bar 73 and the first straight portion 71s of the U-phase first bus bar 71. The retracting portion 94 A is disposed with a space between the first straight portion 73 s of the V-phase first bus bar 73 and the first straight portion 71 s of the U-phase first bus bar 71.

The W-phase second bus bar 76 is held by the sandwiching portion 66 in the first straight portion 76s. In other words, the W-phase second bus bar 76 is held by the holding portion 66 between the first lead wire connecting portion 76a and the second lead wire connecting portion 76b. The W-phase first bus bar 75 and the W-phase second bus bar 76 are respectively provided for the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, and the V-phase second bus bar 74, respectively. They are arranged at different 120 ° angles in the circumferential direction.

The W-phase first bus bar 75 and the W-phase second bus bar 76 held by the clamping unit 66 are arranged along the upper surface of the bus bar holder 61. The W-phase first bus bar 75 and the W-phase second bus bar 76 may be spaced from the upper surface of the bus bar holder 61 or may be in contact with the upper surface of the bus bar holder 61.
The W-phase first bus bar 75 and the W-phase second bus bar 76 include a first straight portion 75s, a second straight portion 75t, a terminal connection portion 75c, a first lead wire connection portion 75a, and a second Of the lead wire connecting portion 75b, the first straight portion 76s, the second straight portion 76t, the terminal connecting portion 76c, the first lead wire connecting portion 76a, and the second lead wire connecting portion 76ab. Coincides with the U-phase first bus bar 71 and the U-phase second bus bar 72. In other words, the W-phase first bus bar 75 and the W-phase second bus bar 76 have portions in the vertical direction other than the retracting

portions

93A, 93B, 94A, and 94B so that the U-phase first bus bar 71 and the U-phase second bus bar 72 Matches.

The first leader line connecting portion 76a and the second leader line connecting portion 76b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction. Further, the first lead wire connecting portion 76a and the second lead wire connecting portion 76b are connected to the first lead wire connecting portion 75a and the second lead wire connecting portion 75b of the W-phase first bus bar 75 from the vertical direction. They are arranged on a concentric circle with the central axis J as the center.

In the W-phase first bus bar 75 and the W-phase second bus bar 76, the first straight portion 75s and the first straight portion 76s are located on the opposite sides with the central axis J in between. Further, in the W-phase first bus bar 75 and the W-phase second bus bar 76, the first straight portion 75s and the first straight portion 76s extend in parallel.
The W-phase first bus bar 75 and the W-phase second bus bar 76 extend from the connected W-phase external connection terminal 83 to the opposite sides in the circumferential direction.
As a result, the magnetic field generated by the W-phase first bus bar 75 and the magnetic field generated by the W-phase second bus bar 76 cancel each other, and the influence on the outside is suppressed.

As shown in FIG. 4, a plurality of external connection terminals 80 are provided on the upper surface of the bus bar holder 61. In the present embodiment, the external connection terminal 80 includes a U-phase external connection terminal 81, a V-phase external connection terminal 82, and a W-phase external connection terminal 83. U-phase external connection terminal 81, V-phase external connection terminal 82, and W-phase external connection terminal 83 are each connected to bus bar 70 and extend upward from bus bar 70. The U-phase external connection terminal 81, the V-phase external connection terminal 82, and the W-phase external connection terminal 83 are each composed of a terminal member 85 having a common shape.

The terminal member 85 is made of a conductive metal material. The terminal member 85 is a plate-like member and extends upward. The terminal member 85 includes a terminal extending portion 86 and a terminal base portion 87. The terminal extending portion 86 is connected to a connector (not shown) of an external device.
The terminal base 87 is held by the terminal holding part 69 of the bus bar holder 61. In the terminal base 87, the

columnar members

69a and 69b are inserted into the holding

grooves

69m and 69n at both ends in the width direction.

The terminal member 85 has a bus bar holding groove 89. The bus bar holding groove 89 is provided at the lower end of the terminal base 87. The bus bar holding groove 89 is U-shaped and opens below the terminal base 87. Two bus bar holding grooves 89 are provided at intervals in the width direction of the terminal base 87.
As shown in FIG. 7, in the bus

bar holding grooves

89 and 89 of the U-phase external connection terminal 81, there are a terminal connection portion 71c of the U-phase first bus bar 71 and a terminal connection portion 72c of the U-phase second bus bar 72. Inserted. The bus

bar holding grooves

89 and 89 of the U-phase external connection terminal 81 and the

terminal connection portions

71c and 72c are joined by laser welding or the like.
As shown in FIG. 8, the bus

bar holding grooves

89 and 89 of the V-phase external connection terminal 82 include the terminal connection portion 73 c of the V-phase first bus bar 73 and the terminal connection portion 74 c of the V-phase second bus bar 74. Inserted. The bus

bar holding grooves

89 and 89 of the V-phase external connection terminal 82 and the

terminal connection portions

73c and 74c are joined by laser welding or the like.
As shown in FIG. 4, in the bus

bar holding grooves

89 and 89 of the W-phase external connection terminal 83, there are a terminal connection portion 75c of the W-phase first bus bar 75 and a terminal connection portion 76c of the W-phase second bus bar 76. Inserted. Bus

bar holding grooves

89 and 89 of W-phase external connection terminal 83 and

terminal connection portions

75c and 76c are joined by laser welding or the like.

To assemble the bus bar holder 61 as described above, first, the U-phase first bus bar 71 and the U-phase second bus bar 72 are assembled to the bus bar holder 61 as shown in FIG. For this, the first straight line portion 71 s of the U-phase first bus bar 71 and the first straight line portion 72 s of the U-phase second bus bar 72 are respectively fitted into the holding portions 66 by snap fit. Thereby, the 1st leader line connection part 71a of the U-phase 1st bus bar 71, the 2nd leader line connection part 71b, the 1st leader line connection part 72a of the U-phase 2nd bus bar 72, and the 2nd leader line connection The leading ends of the second lead lines 45 are inserted into the portions 72b, respectively.

Next, as shown in FIG. 8, the V-phase first bus bar 73 and the V-phase second bus bar 74 are assembled to the bus bar holder 61. For this, the first straight portion 73 s of the V-phase first bus bar 73 and the first straight portion 74 s of the V-phase second bus bar 74 are respectively fitted into the holding portions 66 by snap fitting. Thereby, the 1st leader line connection part 73a of the V phase 1st bus bar 73, the 2nd leader line connection part 73b, the 1st leader line connection part 74a of the V phase 2nd bus bar 74, and the 2nd leader line connection The leading ends of the second lead lines 45 are inserted into the portions 74b, respectively.

Next, as shown in FIG. 4, the W-phase first bus bar 75 and the W-phase second bus bar 76 are assembled to the bus bar holder 61. For this, the first straight portion 75 s of the W-phase first bus bar 75 and the first straight portion 76 s of the W-phase second bus bar 76 are respectively fitted into the holding portions 66 by snap fitting. As a result, the first lead wire connecting portion 75a and the second lead wire connecting portion 75b of the W-phase first bus bar 75, and the first lead wire connecting portion 76a and the second lead wire connecting portion of the W-phase second bus bar 76 are obtained. The leading ends of the second lead lines 45 are inserted into the portions 76b, respectively.

Thereafter, the terminal member 85 is attached to each terminal holding portion 69. Accordingly, the terminal connection portion 71 c of the U-phase first bus bar 71 and the terminal connection portion 72 c of the U-phase second bus bar 72 are inserted into the bus

bar holding grooves

89 and 89 of the U-phase external connection terminal 81. The terminal connection portion 73 c of the V-phase first bus bar 73 and the terminal connection portion 74 c of the V-phase second bus bar 74 are inserted into the bus

bar holding grooves

89 and 89 of the V-phase external connection terminal 82. The terminal connection part 75c of the W-phase first bus bar 75 and the terminal connection part 76c of the W-phase second bus bar 76 are inserted into the bus

bar holding grooves

89 and 89 of the W-phase external connection terminal 83.

Next, a plurality of bus bars (U-phase first bus bar 71, U-phase second bus bar 72, V-phase first bus bar 73, V-phase second bus bar 74, W-phase first bus bar 75, W-phase second bus bar 76). Each is welded to the second lead wire 45. For this purpose, the lead

wire connecting portions

71a, 71b, 72a, 72b, 73a, 73b, 74a, 74b, 75a, 75b, 76a, 76b and the second lead wire 45 are welded.
For example, the U-phase first bus bar 71 will be described as an example. As shown in FIG. 6, in order to weld the first lead wire connecting portion 71 a and the second lead wire 45 of the U-phase first bus bar 71, the pair of extending portions 71 v are sandwiched from the outside by the welding jig 100. Hold on. In this state, the first lead wire connecting portion 71a and the second lead wire 45 are welded by laser welding or the like. The first lead wire connecting portion 71a has a first straight portion 71s and an extending portion 71f on both sides thereof via a first end portion 71d and a second end portion 71e. Thereby, the welding jig 100 which pinches | interposes the 1st leader line connection part 71a collides with the 1st linear part 71s and the extension part 71f, when position shift arises. Therefore, the displacement of the welding jig 100 is further suppressed, and the first lead wire connecting portion 71 a is reliably held by the welding jig 100.
In order to weld the second lead wire connecting portion 71 b and the second lead wire 45 of the U-phase first bus bar 71, the pair of extending portions 71 v are sandwiched and held by the welding jig 100 from the outside. In this state, the second lead wire connecting portion 71b and the second lead wire 45 are welded by laser welding or the like. The second lead wire connecting portion 72a has a first straight portion 71s and a second straight portion 71t on both sides via a third end portion 71h and a fourth end portion 71i. Thereby, the welding jig 100 which pinches | interposes the 2nd leader line connection part 71b collides with the 1st linear part 71s and the 2nd linear part 71t, when a position shift arises. Therefore, the second lead wire connecting portion 71 b is securely held by the welding jig 100.

Similarly, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are each similarly welded with the welding jig 100. Welding while holding the lead wire connection.

Each of the U-phase first bus bar 71, U-phase second bus bar 72, V-phase first bus bar 73, V-phase second bus bar 74, W-phase first bus bar 75, W-phase second bus bar 76, and second drawer Welding with the wire 45 is sequentially performed by rotating the bus bar holder 61 around the central axis J with respect to the welding jig 100 and the laser irradiation nozzle for performing laser welding.

Thereafter, the U-phase external connection terminal 81, the V-phase external connection terminal 82, the W-phase external connection terminal 83, the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, and the V-phase second. The bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are welded.
Thereby, the assembly of the bus bar unit 60 is completed.

According to this embodiment, the bus bar 70 (U-phase first bus bar 71, U-phase second bus bar 72, V-phase first bus bar 73, V-phase second bus bar 74, W-phase first bus bar 75, W-phase second bus bar. 76) each comprises a wire 77. Thus, by using the wire rod 77 for the bus bar 70, the bus bar 70 can be manufactured by a forming machine. This eliminates the need for a mold to manufacture the bus bar 70. Therefore, the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 having different shapes. However, it can be manufactured at low cost. Thus, by using the wire rod 77 for the bus bar 70, it is easy to cope with a large variety of small-quantity production. In addition, it is possible to easily cope with a design change of the bus bar 70. In addition, by using the wire rod 77 for the bus bar 70, the wire rod 77 that is not required is reduced as compared with press working or the like, and the yield of the material is improved.

Further, each of the lead

wire connection portions

71a, 71b, 72a, 72b, 73a, 73b, 74a, 74b, 75a, 75b, 76a, and 76b has a U-shape that opens in the radial direction. Thereby, it is not necessary to change the attitude of the welding jig 100 in the welding process. Therefore, the manufacturing process can be simplified.

Further, by providing the first straight portions 71s to 76s, it is easier to reduce the radial dimension of the bus bar 70 than when the bus bar 70 is curved without providing the straight portion. Therefore, the bus bar 70 and the bus bar unit 60 including the bus bar 70 can be reduced in size. Further, by providing the first straight line portions 71s to 76s, the first lead wire connection portions 71a to 76a and the second lead wire connection portions 71b to 76b can be connected at the shortest distance. Thereby, the usage-amount of the wire 77 can be saved.
Therefore, it is possible to reduce the size of the bus bar 70 and to save the use amount of the wire 77 necessary for configuring the bus bar 70.

According to the present embodiment, the second end portions 71e to 76e are provided with the extending portions 71f to 76f extending in the direction away from the openings 71p to 76p of the first lead wire connecting portions 71a to 76a. Accordingly, it is possible to suppress the displacement of the welding jig 100 when welding the first lead wire connecting portions 71a to 76a and the second lead wire 45. Therefore, the first lead wire connection portions 71a to 76a can be stably held, and the welding process between the first lead wire connection portions 71a to 76a and the second lead wire 45 can be stably performed.

According to the present embodiment, the second lead wire connecting portions 71b to 76b are connected to the first straight portions on both sides via the third ends 71h to 76h and the fourth ends 71i to 76i. 71s to 76s and second straight portions 71t to 76t. Thereby, even when the second lead wire connecting portions 71b to 76b and the second lead wire 45 are welded, the displacement of the welding jig 100 can be suppressed.
Further, the second straight portions 71t to 76t are parallel to the first straight portions 71s to 76s, and are shifted from the imaginary line L extending the first straight portions 71s to 76s. Thereby, it is easy to arrange the plurality of bus bars 70 while avoiding interference between the plurality of bus bars 70.

According to the present embodiment, the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b are arranged on a concentric circle with the central axis J as the center when viewed from the vertical direction. As a result, the bus bar holder 61 is rotated about the central axis J when welding the first lead wire connecting portions 71a to 76a, the second lead wire connecting portions 71b to 76b, and the second lead wire 45. If so, it is not necessary to move the welding jig 100 and the laser welding nozzle in the radial direction. Therefore, the welding process can be performed efficiently.

According to this embodiment, each of the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76. Is held by the holding portion 66 in the first straight portions 71s to 76s. As a result, the positional accuracy of the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b located on both sides of the first straight portions 71s to 76s with respect to the second lead wire 45 is improved. be able to. Further, when vibration is applied from the outside, it is possible to suppress the load from being applied to the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b.

According to the present embodiment, each of the bus bars 70 is held by the holding portion 66 between the first lead wire connection portions 71a to 76a and the second lead wire connection portions 71b to 76b. Thereby, the positional accuracy of the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b can be increased. Further, when vibration is applied from the outside, it is possible to suppress the load from being applied to the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b.

According to the present embodiment, the plurality of bus bars 70 have intersections J1 to J6 that intersect with each other when viewed in the vertical direction, and any one of the pair of bus bars 70 that intersect with each other at the intersections J1 to J6. And a retracting portion 93 that passes through the other upper side. Accordingly, the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are vertically dimensioned. Can be arranged with a minimum. Therefore, the bus bar unit 60 can be reduced in size.
The U-phase first bus bar 71, U-phase second bus bar 72, V-phase first bus bar 73, V-phase second bus bar 74, W-phase first bus bar 75, and W-phase second bus bar 76 are held by the clamping unit 66. Is done. Thereby, even when vibration is applied, it is possible to suppress the bus bars 70 from contacting each other at the intersections J1 to J6.
Further, at least the terminal connection portion 71c in the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76. ˜76c and the first lead wire connecting portions 71a˜76a are in the same vertical position. Thereby, it is not necessary to move the welding jig 100 and the laser welding nozzle in the up-down direction. Therefore, the welding process can be performed efficiently.

According to this embodiment, in the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76, The vertical positions including the terminal connection portions 71c to 76c and the first lead wire connection portions 71a to 76a are held by the holding portion 66 in the same region. Accordingly, the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76 are vertically dimensioned. Can be arranged with a minimum. Therefore, the bus bar unit 60 can be reduced in size. Moreover, the vertical position of the clamping part 66 can be made into the same position.
Further, in the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76, the sandwiching portion 66 includes the retracting

portions

93, 94, 93A, 93B, 94A, 94B. Keep the root. Thereby, the positional accuracy of the terminal connection portions 73c to 76c, the first lead wire connection portions 73a to 76a, and the second lead wire connection portions 73b to 76b can be improved. Further, even when vibration is applied, it is possible to suppress the load from being applied to the terminal connection portions 73c to 76c, the first lead wire connection portions 73a to 76a, and the second lead wire connection portions 73b to 76b.

According to the present embodiment, the V-phase first bus bar 73 and the V-phase second bus bar 74 have the retracting

portions

93 and 94 at the portions intersecting with the U-phase first bus bar 71 and the U-phase second bus bar 72. The W-phase first bus bar 75 and the W-phase second bus bar 76 are retracted to the portions intersecting with the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, and the V-phase second bus bar 74, respectively. It has

parts

93A, 93B, 94A, 94B. As a result, the bus bar 70 is moved in the order of the U-phase first bus bar 71, the U-phase second bus bar 72, the V-phase first bus bar 73, the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76. By assembling to the bus bar holder 61, the bus bar unit 60 can be easily assembled.

According to the present embodiment, the motor 10 has the bus bar unit 60 as described above. As a result, the bus bar 70 can be miniaturized and the amount of wire 77 used to configure the bus bar 70 can be saved.

According to the present embodiment, the motor 10 has the bus bar unit 60 as described above. Thereby, the first lead wire connecting portions 71a to 76a can be stably held, and the welding process between the first lead wire connecting portions 71a to 76a and the second lead wire 45 can be stably performed.

According to the present embodiment, the motor 10 has the bus bar unit 60 as described above. Thus, the contact between the bus bars 70 can be reliably suppressed, and the welding process can be performed efficiently.

FIG. 9 is a diagram illustrating an apparatus on which the motor of one embodiment is mounted.
Next, an embodiment of an apparatus on which the motor 10 of this embodiment is mounted will be described. In the present embodiment, an example in which the motor 10 is mounted on an electric power steering device will be described. The electric power steering apparatus 2 shown in FIG. 9 is mounted on a steering mechanism for a vehicle wheel. The electric power steering device 2 is a device that reduces the steering force by hydraulic pressure. The electric power steering apparatus 2 includes a motor 10, 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 of the oil pump 216. In the electric power steering apparatus 2, the motor 10 is mounted as a drive source for the oil pump 216.

Since the electric power steering device 2 of the present embodiment includes the motor 10 of the present embodiment, it is possible to reduce the size of the bus bar unit 60 and to suppress the influence of the magnetic field on the outside.

Although the embodiments of the present invention have been described above, the configurations and combinations thereof in the embodiments are examples, and additions, omissions, substitutions, and other modifications of the configurations are within the scope that does not depart from the spirit of the present invention. Is possible. Further, the present invention is not limited by the embodiment.

For example, the motor of the above-described embodiment is not limited to the electric power steering device, and may be mounted on any device.

In the above embodiment, each of the bus bars 70 includes the first lead wire connection portions 71a to 76a and the second lead wire connection portions 71b to 76b. However, only one lead wire connection portion is provided. May be provided, and three or more lead wire connecting parts may be provided.

The above configurations can be appropriately combined within a range that does not contradict each other.

DESCRIPTION OF SYMBOLS 10 ... Motor, 30 ... Rotor, 40 ... Stator, 60 ... Bus bar unit, 61 ... Bus bar holder, 66 ... Clamping part, 70 ... Bus bar, 70U ... U-phase bus bar group (1st type bus bar), 70V ... V phase Bus bar group (second-type bus bar), 70W ... W-phase bus bar group (third-type bus bar), 71 ... U-phase first bus bar, 71a to 76a ... first lead wire connection portion (lead wire connection portion) ), 71b to 76b... Second lead wire connecting portion (leader wire connecting portion), 71c to 76c... Terminal connecting portion, 71d to 76d... First end, 71e to 76e. 76f ... extension portion, 71h to 76h ... third end, 71i to 71i ... fourth end, 71p to 76p ... opening, 71s to 76s ... first straight portion, 71t to 76t ... second straight line Part 72 ... U-phase second bus bar 73 ... V First bus bar, 74 ... V phase second bus bar, 75 ... W phase first bus bar, 76 ... W phase second bus bar, 77 ... wire rod, 80 ... external connection terminal, 81 ... U phase external connection terminal, 82 ... V phase External connection terminal, 83 ... W-phase external connection terminal, 93, 94, 93A, 93B, 94A, 94B ... Retraction part, J ... Central axis, J1 to J6 ... Intersection, L ... Virtual line

Claims

A bus bar unit provided in the motor,
A bus bar holder provided on one axial side of a stator that is annularly arranged around a central axis extending in the vertical direction;
A plurality of bus bars extending along a plane orthogonal to the axial direction and fixed to the bus bar holder;
An external connection terminal connected to the bus bar and extending upward from the bus bar,
The bus bar is made of wire,
The bus bar
A terminal connection portion connected to the external connection terminal;
A lead wire connecting portion connected to a lead wire extending from the stator, and
The plurality of bus bars have at least intersecting portions where the terminal connection portions and the lead wire connection portions coincide with each other in the axial direction and intersect with each other when viewed from the axial direction.
In the crossing portion, either one of the pair of bus bars crossing each other further has a retracting portion that passes over the other side,
The bus bar holder is a bus bar unit having a sandwiching portion that sandwiches and holds the bus bar.
2. The bus bar unit according to claim 1, wherein the bus bar is held by the sandwiching portion in a region where an axial position including the terminal connection portion and the lead wire connection portion is the same.
[Claim 3] The bus bar unit according to claim 2, wherein the clamping unit holds a root of the retracting unit.
The bus bar unit according to any one of claims 1 to 3, wherein the bus bar includes a plurality of the lead wire connection portions and is held by the holding portion between the lead wire connection portions.
The plurality of bus bars are classified into a first type bus bar, a second type bus bar, and a third type bus bar,
The second type bus bar has the retracting portion at a portion intersecting with the first type bus bar,
The bus bar unit according to any one of claims 1 to 4, wherein each of the third type bus bars has the retracting portion at a portion intersecting with the first type bus bar and the second type bus bar.
A motor having the bus bar unit according to any one of claims 1 to 5,
The stator around which a coil wire is wound;
A motor comprising: the stator; and a rotor opposed in a radial direction through a gap.