JPWO2018180818A1 - Busbar unit and motor - Google Patents

Abstract

One aspect of the bus bar unit of the present invention is a bus bar unit provided in a motor, and a bus bar holder provided on one axial side of a stator arranged annularly around a central axis extending in a vertical direction; A plurality of bus bars extending along an orthogonal plane and fixed to the bus bar holder, and external connection terminals connected to the bus bar and extending upward from the bus bar, wherein the bus bar is made of a wire, and the bus bar is an external connection terminal. And a lead wire connection portion connected to a lead wire extending from the stator, and the plurality of bus bars have at least the same axial position of the terminal connection portion and the lead wire connection portion. And an intersection that intersects each other when viewed from the axial direction. At the intersection, one of a pair of bus bars that intersect with each other Further comprising an evacuation unit through the bus bar holder has a clamping portion for holding sandwich the bus bars.

Description

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

A motor having a bus bar unit is known. The bus bar unit includes a bus bar to which coils of each phase of the motor are connected. A connector for supplying power to the coils of each phase from outside 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 the motor. In this bus bar unit, the bus bar is formed by bending a wire.

JP 2013-220005 A

  On the other hand, in a busbar unit, a structure is known in which busbars are arranged so as to intersect with each other when viewed from the axial direction, thereby reducing the size of the busbar unit. In this case, even when vibration is applied, it is necessary to surely prevent the bus bars from contacting each other and causing an electrical short circuit.

  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 reducing the size.

  One aspect of the bus bar unit of the present invention is a bus bar unit provided in a motor, and a bus bar holder provided on one axial side of a stator arranged annularly around a central axis extending in a vertical direction; The bus bar includes a plurality of bus bars extending along an orthogonal plane and fixed to the bus bar holder, and external connection terminals connected to the bus bar and extending upward from the bus bar. The bus bar is made of a wire. The bus bar has 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 busbars have at least the terminal connection portions and the lead wire connection portions in the same axial position, and have crossing portions that cross each other when viewed from the axial direction. In the intersection, any one of the pair of bus bars intersecting with each other further has a retreating part passing above the other. The bus bar holder has a holding portion for holding the bus bar therebetween.

  According to one aspect of the present invention, there is provided a busbar unit capable of reliably suppressing contact between busbars while achieving downsizing.

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

  FIG. 1 is a perspective developed view showing a stator and a bus bar unit of the motor according to the present embodiment. FIG. 2 is a perspective view illustrating a configuration of the stator according to the embodiment. FIG. 3 is a perspective view illustrating a configuration of the stator according to the embodiment. 1, 2, and 3, the 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 arranged along a central axis J extending in the up-down 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 about the central axis J is simply referred to as “radial direction”, and the central axis J is defined as a center. The circumferential direction is simply referred to as “circumferential direction”. The upper side in FIG. 1 of the up-down direction is simply referred to as “upper side”, and the lower side in FIG. 1 of the up-down direction is simply referred to as “lower side”. It should be noted that the terms “upper”, “lower”, and “up and down” are simply names for describing the relative positional relationship between the components, and do not limit the actual arrangement relationship or the like.

  The rotor core 32 is a cylindrical member. When viewed from above and below, 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 the present 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 sheet in which a plurality of electromagnetic steel sheets are vertically stacked.

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, bonding, or the like, or may be fixed via a resin member or the like. That is, the shaft 31 is directly or indirectly fixed to the rotor core 32. In addition, the shaft 31 may be a hollow member, and is not particularly limited.
In this embodiment, the dimension of the rotor core 32 in the up-down direction is the same as the dimension of the stator core 41 described later. However, the dimensions of the rotor core 32 may be different from the dimensions 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 up-down direction. Adjacent magnets 33 face 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 via a gap in the circumferential direction.

  In the present embodiment, the dimension of the magnet 33 in the vertical direction is the same as the dimension length of the rotor core 32. 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. Note that the vertical dimension of the magnet 33 may be different from the vertical dimension of the stator core 41.

  Stator 40 is arranged radially outside rotor 30. As shown in FIGS. 2 and 3, the stator 40 is annularly arranged around the central axis J. Stator 40 is housed in a cylindrical housing (not shown). The stator 40 has an annular stator core 41, an insulator 42 mounted on the stator core 41, and a coil (not shown) mounted on the stator core 41 via the insulator 42.

Stator core 41 is a laminated steel sheet in which a plurality of electromagnetic steel sheets are vertically stacked. 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 split core. The core back portion 41a is configured by connecting a plurality of fan-shaped core pieces 46 in a circumferential direction. The teeth 41b are 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 teeth 41b have umbrellas 41c at radially inner ends of the teeth 41b. The umbrella 41c extends from both ends in the radial direction of the teeth 41b to both sides in the circumferential direction. A gap is formed between the umbrellas 41c that are adjacent in the circumferential direction.
In addition, the stator core 41 may be not only a split core but also another type of core such as a so-called straight core or round core.

The material of the insulator 42 has an insulating property. In the present embodiment, the insulator 42 is made of 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 42f above the stator 40. The flange portion 42f is located radially outside 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 an insulating property, and another material may be used.

  The motor 10 of the present embodiment is a so-called three-phase motor having three phases of a U phase, a V phase, and a W phase. The coil (not shown) has four U-phase coils, four V-phase coils, and four W-phase coils. In this 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 coil sets each including the U-phase coil, the V-phase coil, and the W-phase coil.

A coil (not shown) has a coil wire wound around the teeth 41 b via the 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 45 extends longer in the up-down direction than the first lead 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 the 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 12 each.

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

Each neutral point bus bar 48 has a bus bar main body 48a and a coil wire holding portion 48b. The busbar main body 48a has an arc shape extending in the circumferential direction when viewed from the up-down direction.
The coil wire holding portions 48b are provided at a plurality of locations spaced apart 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 positions of the bus bar main body 48a. Each coil wire holding portion 48b has a U-shape that 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 main body 48a. The connecting portion 48d connects radially inner ends of the pair of extending portions 48c, 48c. The connecting portion 48d has a semicircular 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 part 48b. In this way, the ends of the three first lead wires 44U, 44V, 44W drawn from each set of U-phase coil, V-phase coil, and W-phase coil 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. Further, each coil wire holding portion 48b and the end 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 one 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 has 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 above the stator 40.
The bus bar holder 61 is made of an insulating material. In the present 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 one embodiment.
As shown in FIG. 5, the bus bar holder 61 is a substantially plate-shaped member. When viewed from above and below, the bus bar holder 61 has a substantially circular outer shape. The busbar holder 61 has a rotationally symmetrical shape with respect to the central axis J at every 120 °. The bus bar holder 61 has a through-hole 61h that penetrates in the vertical direction at the center. The busbar holder 61 is fitted inside a 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 up-down 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 the lead wire insertion holes 62 is twelve.

The bus bar holder 61 has a holding portion 66 and a terminal holding portion 69 on its upper surface.
The holding portion 66 is provided radially outside the through hole 61h of the bus bar holder 61. The holding portion 66 is provided radially inward of the lead wire insertion hole 62. A plurality of holding portions 66 are provided in the circumferential direction. In the present embodiment, six holding portions 66 are provided at equal intervals in the circumferential direction. Each holding portion 66 has a pair of claw members 66a. Each claw member 66a extends upward. The pair of claw members 66a are opposed to each other at an interval in the radial direction. Each of the pair of claw members 66a has a protrusion (not shown) at each of the distal ends, the protrusion protruding in a direction in which the claw members 66a face each other. The interval between the projections of the pair of claw members 66a is smaller than the outer diameter of a wire 77 of the bus bar 70 described later. Thus, the holding portion 66 holds the wire 77 of the bus bar 70 by snap fitting.

  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, 69b. The pair of columnar members 69a and 69b oppose each other at an interval 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 inside in the facing direction in which the columnar members 69a and 69b face each other. The holding grooves 69m and 69n extend in the up-down direction. The upper ends of the holding grooves 69m, 69n open upward at the upper ends of the columnar members 69a, 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 protrudes toward the upper surface 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 70U includes a U-phase first bus bar 71 and a U-phase second bus bar 72. The V-phase bus bar group 70V includes a V-phase first bus bar 73 and a V-phase second bus bar 74. The W-phase bus bar group 70W 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 respectively orthogonal to the vertical direction. Extend along the surface that

  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. It consists of 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 each include a wire 77, It is formed by bending with a forming machine. The forming machine bends a wire 77 at a predetermined position while feeding the wire 77. The forming machine can set the bending position, bending direction, curvature of the bent portion, and the like of the wire 77 in advance. Thereby, 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 a forming machine. , Are automatically manufactured based on preset programming.

FIG. 7 is a perspective view showing a state in which a group of U-phase bus bars is assembled to the bus bar holder of the embodiment.
As shown in FIGS. 6 and 7, the U-phase first bus bar 71 includes a first linear portion 71s, a second linear 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 (lead wire connecting portion) 71b.

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

  The second straight portion 71t is provided between the second lead wire connecting portion 71b and the terminal connecting portion 71c. The second straight portion 71t extends from a fourth end 71i described later. The second linear portion 71t is linear when viewed from above and below. The second straight portion 71t is parallel to the first straight portion 71s. The second straight portion 71t is arranged to be shifted radially inward with respect to an imaginary line L extending the first straight portion 71s.

  The terminal connection portion 71c is located at one end of the U-phase first bus bar 71. The terminal connecting portion 71c is bent approximately 90 ° inward in the radial direction from the end of the second straight portion 71t, and extends perpendicular to the radial direction. The terminal connection part 71c is connected to the 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 curved portion 71w. The pair of extending portions 71v extend parallel to each other along the radial direction. The pair of extending portions 71v are arranged on both sides of the lead wire insertion hole 62 of the bus bar holder 61. The curved portion 71w connects radially outer ends of the pair of extending portions 71v. The curved portion 71w has a semicircular shape and is curved along the inner peripheral edge of the lead wire insertion hole 62. As described above, the first lead wire connecting portion 71a has a U-shape that opens radially inward. The first lead wire connecting portion 71a has an opening 71p that opens radially inward. The first lead wire connecting portion 71a 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 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 has a first end 71d and a second end 71e. The first end 71d is connected to an end of the first linear portion 71s. The second end 71e is located on the opposite side of the first end 71d. The second end 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 extension 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 curved portion 71w. As described above, the second lead wire connecting portion 71b is U-shaped and opens radially inward. The second lead wire connecting portion 71b has an opening 71p that opens radially inward.

  The second lead wire connecting portion 71b is connected to the second lead wire 45 projecting 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 has a third end 71h and a fourth end 71i. The third end 71h is connected to an end of the first linear portion 71s. The fourth end 71i is located on the opposite side of the third end 71h. The fourth end 71i is connected to an end of the second straight portion 71t.

  The U-phase first bus bar 71 is held by the holding portion 66 at the first linear 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 line connecting portion 71a and the second lead line connecting portion 71b are arranged on a concentric circle centered on the central axis J when viewed from above and below.

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

  The second straight 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 linear portion 72t is linear when viewed from above and below. The second straight portion 72t is parallel to the first straight portion 72s. The second linear portion 72t is arranged to be shifted radially inward from the imaginary line L extending the first linear portion 72s.

  The terminal connection part 72c is located at one end of the U-phase second bus bar 72. The terminal connection portion 72c is bent radially inward from the end of the second linear portion 72t by about 90 °, and extends orthogonally to the radial direction. The terminal connection part 72c is arranged radially outward with respect to the terminal connection part 71c of the U-phase first bus bar 71. The terminal connection part 72c is arranged in parallel with the terminal connection part 71c of the U-phase first bus bar 71. The terminal connection part 72c is connected to the U-phase external connection terminal 81.

  The first lead wire connecting portion 72a is located at the other end of the U-phase second bus bar 72. The first lead wire connecting portion 72a has the same shape as the first lead wire connecting portion 71a. The first lead wire connecting portion 72a is U-shaped and opens radially inward. The first lead wire connecting portion 72a has an opening 72p that opens radially inward. The first lead wire connecting portion 72a is connected to the second lead wire 45 projecting 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 connecting portion 72a further has a first end 72d and a second end 72e. The first end 72d is connected to an end of the first linear portion 72s. The second end 72e is located on the opposite side of the first end 72d. The second end 72e is provided with an extension 72f extending in a direction away from the opening 72p of the first lead wire connection 72a. The extension 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 is U-shaped and opens radially inward. The second lead wire connecting portion 72b has an opening 72p that opens radially inward. The second lead wire connecting portion 72b 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 has a third end 72h and a fourth end 72i. The third end 72h is connected to an end of the first linear portion 72s. The fourth end 72i is located on the opposite side of the third end 72h. The fourth end 72i is connected to an end of the second linear portion 72t.

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

Such a U-phase first bus bar 71 and a U-phase second bus bar 72 are connected to a first linear portion 71s, a terminal connecting portion 71c and a first lead wire connecting portion 71a, and a first linear portion 72s, a terminal connecting portion. The entire position including the portion 72c and the first lead wire connecting portion 72a has the same vertical position.
The first lead wire connecting portion 72a and the second lead wire connecting portion 72b are arranged on a concentric circle centered on the center axis J when viewed from above and below. Further, the first lead wire connecting portion 72a and the second lead wire connecting portion 72b are connected to the first lead wire connecting portion 71a and the second lead wire connecting portion 71b of the U-phase first bus bar 71 from above and below. Seen on a concentric circle centered on the center axis J.

In the U-phase first bus bar 71 and the U-phase second bus bar 72, the first linear portion 71s and the first linear portion 72s are located on opposite sides of the center axis J. In the U-phase first bus bar 71 and the U-phase second bus bar 72, the first linear portion 71s and the first linear portion 72s extend in parallel.
Further, 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 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 cancel each other out, thereby suppressing influence on the outside.

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

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

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

The first lead wire connecting portion 73a is located at the other end of the 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 is U-shaped and opens radially inward.
The first lead wire connecting portion 73a is connected to the second lead wire 45 projecting 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 has a first end 73d and a second end 73e. The first end 73d is connected to an end of the first linear portion 73s. The second end 73e is located on the opposite side of the first end 73d. The second end 73e is provided with an extension 73f extending in a direction away from the opening 73p of the first lead wire connection 73a. The extension 73f extends in a direction orthogonal to the radial direction.

The second lead wire connecting portion 73b is located between the terminal connecting portion 73c and the first lead wire connecting 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 is U-shaped and opens radially inward. The second lead wire connecting portion 73b has an opening 73p that opens radially inward.
The second lead wire connecting portion 73b is connected to the second lead wire 45 projecting 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 connecting portion 73b further has a third end 73h and a fourth end 73i. The third end 73h is connected to an end of the first linear portion 73s. The fourth end 73i is located on the opposite side of the third end 73h. The fourth end 73i is connected to an end of the second straight portion 73t.

The V-phase first bus bar 73 is held by the holding portion 66 at the first linear 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 lead line connecting portion 73a and the second lead line connecting portion 73b are arranged on a concentric circle centered on the central axis J when viewed from above and below.

  The V-phase first bus bar 73 has an intersection J1 that crosses a part of the U-phase second bus bar 72 when viewed from above and below. V-phase first bus bar 73 has evacuation portion 93 at intersection J1. The retreating part 93 passes above the intersecting U-phase second bus bar 72. The retreating portion 93 passes above the first linear portion 72s of the U-phase second bus bar 72. The retreating part 93 is provided on the first linear part 73s of the V-phase first bus bar 73. The retracting portion 93 is provided on the side of the second lead line connecting portion 73b in the first straight portion 73s. The retreat part 93 has a pair of leg parts 93a and a bridge part 93b. The pair of legs 93a extend upward from the first straight line portion 73s and the second lead wire connecting portion 73b. The bridge 93b connects the upper ends of the pair of legs 93a. The bridge portion 93b is located above the first straight portion 73s. The bridge portion 93b extends in parallel with the first straight portion 73s. In this way, the evacuation portion 93 straddles the upper side of the first linear portion 72s of the U-phase second bus bar 72. The retreating portion 93 is arranged at an interval between the retreating portion 93 and the first linear portion 72s 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 wire. And a wire connecting portion (lead wire connecting portion) 74b.
The first straight portion 74s is provided between the first lead wire connecting portion 74a and the second lead wire connecting 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 straight when viewed from above and below. The first straight portion 74s extends in a direction orthogonal to the radial direction.

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

  The terminal connection part 74c is located at one end of the V-phase second bus bar 74. The terminal connection portion 74c is bent approximately 90 ° inward in the radial direction from the end of the second straight portion 74t, and extends perpendicular to the radial direction. The terminal connection part 74c is arranged on the terminal connection part 73c of the V-phase first bus bar 73 so as to be shifted radially outward. The terminal connection part 74c is arranged in parallel with the terminal connection part 73c of the V-phase first bus bar 73. The terminal connection part 74c is connected to the 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 is U-shaped and opens radially inward. The first lead wire connecting portion 74a has an opening 74p that opens radially inward. The first lead wire connecting portion 74a is connected to the second lead wire 45 projecting 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 has a first end 74d and a second end 74e. The first end 74d is connected to an end of the first linear portion 74s. The second end 74e is located on the opposite side of the first end 74d. The second end 74e is provided with an extension 74f extending in a direction away from the opening 74p of the first lead wire connection 74a. The extension 74f extends in a direction orthogonal to the radial direction.

The second lead wire connecting portion 74b is located between the terminal connecting portion 74c and the first lead wire connecting 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 74b is connected to the second lead wire 45 projecting upward from the bus bar holder 61. The second lead wire 45 is located inside the second lead wire connection part 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 connecting portion 74b further has a third end 74h and a fourth end 74i. The third end 74h is connected to an end 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 an end of the second straight portion 74t.

  The V-phase second bus bar 74 has an intersection J2 that crosses a part of the U-phase first bus bar 71 when viewed from above and below. The V-phase second bus bar 74 has a retreat portion 94 at the intersection J2. The retreat part 94 passes above the intersecting U-phase first bus bar 71. The retreating portion 94 passes above the first linear portion 71s of the U-phase first bus bar 71. The retreating part 94 is provided on the first linear part 74 s of the V-phase second bus bar 74. The retracting portion 94 is provided on the first lead line connecting portion 74a side in the first straight portion 74s. The retracting section 94 has the same shape as the retracting section 94. The evacuation unit 94 straddles the upper side of the first linear portion 71s of the U-phase first bus bar 71. The retreating part 94 is arranged at an interval between the retreating part 94 and the first linear part 71 s of the U-phase first bus bar 71.

  The V-phase second bus bar 74 is held by the holding portion 66 at the first linear 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 circumferential angles different from the U-phase first bus bar 71 and the U-phase second bus bar 72 by 120 °.

The V-phase first bus bar 73 and the V-phase second bus bar 74 held by the holding portion 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 have a gap between them and the upper surface of the bus bar holder 61, or may be in contact with the upper surface of the bus bar holder 61.
Such a V-phase first bus bar 73 and a V-phase second bus bar 74 include a first linear portion 73s, a second linear portion 73t, a terminal connecting portion 73c, a first lead wire connecting portion 73a, and a second linear portion 73a. And the first straight portion 74s, the second straight portion 74t, the terminal connecting portion 74c, the first leading wire connecting portion 74a, and the second leading wire connecting portion 74b. Correspond to 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 the portions other than the retreating portions 93 and 94 match 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 centered on the center axis J when viewed from above and below. 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 above and below. Seen on a concentric circle centered on the center axis J.

In the V-phase first bus bar 73 and the V-phase second bus bar 74, the first linear portion 73s and the first linear portion 74s are located on opposite sides of the center axis J. In the V-phase first bus bar 73 and the V-phase second bus bar 74, a first linear portion 73s and a first linear portion 74s extend in parallel.
Further, the V-phase first bus bar 73 and the V-phase second bus bar 74 extend from the V-phase external connection terminals 82 connected to each other in the circumferential direction.
Thereby, 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 out, thereby suppressing influence on the outside.

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

  The second straight 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 75i described later. The second linear portion 75t is linear when viewed from above and below. The second straight portion 75t is parallel to the first straight portion 75s. The second straight portion 75t is arranged to be shifted radially inward from the imaginary line L extending the first straight portion 75s.

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

The first lead wire connecting portion 75 a is located at the other end of the 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 is U-shaped and opens radially inward. The first lead wire connecting portion 75a has an opening 75p that opens radially inward.
The first lead wire connecting portion 75a 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 connection part 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 has a first end 75d and a second end 75e. The first end 75d is connected to an end of the first linear portion 75s. The second end 75e is located on the opposite side of the first end 75d. The second end portion 75e is provided with an extension portion 75f extending in a direction away from the opening 75p of the first lead wire connection portion 75a. The extension 75f extends in a direction orthogonal to the radial direction.

The second lead wire connecting portion 75b is located between the terminal connecting portion 75c and the first lead wire connecting 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 second lead wire connecting portion 75b is U-shaped and opens radially inward. The second lead wire connecting portion 75b has an opening 75p that opens radially inward.
The second lead wire connecting portion 75b 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 connecting portion 75b further has a third end 75h and a fourth end 75i. The third end 75h is connected to an end of the first linear portion 75s. The fourth end 75i is located on the opposite side of the third end 75h. The fourth end 75i is connected to an end of the second linear portion 75t.

The W-phase first bus bar 75 is held by the holding portion 66 at the first linear portion 75s. In other words, the W-phase first bus bar 75 is held by the sandwiching portion 66 between the first lead wire connecting portion 75a and the second lead wire connecting portion 75b.
The first lead line connecting portion 75a and the second lead line connecting portion 75b are arranged on a concentric circle centered on the center axis J when viewed from above and below.

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

  The retracting portions 93A and 93B have the same shape as the retracting portion 93. The retreating parts 93A and 93B straddle the first linear part 72s of the U-phase second bus bar 72 and the first linear part 74s of the V-phase second bus bar 74. The retreating portion 93A is arranged at an interval between the first linear portion 72s of the U-phase second bus bar 72 and the first linear 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. And a wire connection portion (lead wire connection portion) 76b.
The first straight line portion 76s is provided between the first lead wire connecting portion 76a and the second lead wire connecting portion 76b. The first straight line portion 76s connects the first lead wire connecting portion 76a and the second lead wire connecting portion 76b. The first straight portion 76s is straight when viewed from above and below. 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 76i described later. The second linear portion 76t is linear when viewed from above and below. 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 the imaginary line L extending the first straight portion 76s.

  The terminal connection portion 76c is located at one end of the W-phase second bus bar 76. The terminal connecting portion 76c is bent radially inward from the end of the second linear portion 76t by about 90 °, and extends orthogonally to the radial direction. The terminal connection part 76c is arranged at the terminal connection part 75c of the W-phase first bus bar 75 so as to be shifted radially outward. The terminal connection part 76c is arranged in parallel with the terminal connection part 75c of the W-phase first bus bar 75. The terminal connection part 76c is connected to the 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 76a is connected to the second lead wire 45 projecting upward from the bus bar holder 61. The first lead wire connecting portion 76a has a shape similar to that of the first lead wire connecting portion 71a. The first lead wire connecting portion 76a is U-shaped and 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 has a first end 76d and a second end 76e. The first end 76d is connected to an end of the first linear portion 76s. The second end 76e is located on the opposite side of the first end 76d. The second end portion 76e is provided with an extension portion 76f extending in a direction away from the opening 76p of the first lead wire connection portion 76a. The extension 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 a shape similar to that of the second lead wire connecting portion 71b. The second lead wire connecting portion 76b is U-shaped and opens radially inward. The second lead wire connecting portion 76b has an opening 76p that opens radially inward.
The second lead wire connecting portion 76b is connected to the second lead wire 45 projecting 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 has a third end 76h and a fourth end 76i. The third end 76h is connected to an end of the first linear portion 76s. The fourth end 76i is located on the opposite side of the third end 76h. The fourth end 76i is connected to an end of the second linear portion 76t.

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

  The retracting portions 94A and 94B have the same shape as the retracting portion 93. The retreating portions 94A and 94B straddle the first linear portion 73s of the V-phase first bus bar 73 and the upper side of the first linear portion 71s of the U-phase first bus bar 71. The retreating portion 94A is arranged at an interval between the first linear portion 73s of the V-phase first bus bar 73 and the first linear portion 71s of the U-phase first bus bar 71.

  The W-phase second bus bar 76 is held by the holding portion 66 at the first linear 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 respectively correspond to the U-phase first bus bar 71 and the U-phase second bus bar 72, and 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 holding portion 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 have a gap between them and 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 linear portion 75s, a second linear portion 75t, a terminal connection portion 75c, a first lead wire connection portion 75a, and a second And a first straight line portion 76s, a second straight line portion 76t, a terminal connection portion 76c, a first lead wire connection portion 76a, and a second lead wire connection portion 76ab. Correspond to 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 are such that the vertical positions of the parts other than the retreating parts 93A, 93B, 94A, 94B are the U-phase first bus bar 71 and the U-phase second bus bar 72. Matches.

  The first lead wire connecting portion 76a and the second lead wire connecting portion 76b are arranged on a concentric circle centered on the center axis J when viewed from above and below. 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 in the vertical direction. Seen on a concentric circle centered on the center axis J.

In the W-phase first bus bar 75 and the W-phase second bus bar 76, the first linear portion 75s and the first linear portion 76s are located on opposite sides of the center axis J. In the W-phase first bus bar 75 and the W-phase second bus bar 76, a first linear portion 75s and a first linear 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 opposite sides in the circumferential direction from each other.
Thereby, 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 out, thereby suppressing the influence on the outside.

  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 has a U-phase external connection terminal 81, a V-phase external connection terminal 82, and a W-phase external connection terminal 83. The U-phase external connection terminal 81, the V-phase external connection terminal 82, and the W-phase external connection terminal 83 are respectively connected to the bus bar 70 and extend upward from the 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 each include 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-shaped member and extends upward. The terminal member 85 has a terminal extension 86 and a terminal base 87. The terminal extension 86 is connected to a connector (not shown) of an external device.
The terminal base 87 is held by the terminal holder 69 of the bus bar holder 61. In the terminal base 87, the ends of the columnar members 69a and 69b on both sides in the width direction are inserted into the holding grooves 69m and 69n.

The terminal member 85 has a busbar holding groove 89. The busbar holding groove 89 is provided at a lower end of the terminal base 87. The bus bar holding groove 89 is U-shaped and opens below the terminal base 87. Two busbar holding grooves 89 are provided at intervals in the width direction of the terminal base 87.
As shown in FIG. 7, terminal connection portions 71c of the U-phase first bus bar 71 and terminal connection portions 72c of the U-phase second bus bar 72 are provided in the bus bar holding grooves 89, 89 of the U-phase external connection terminal 81. Inserted. The busbar holding grooves 89, 89 of the U-phase external connection terminal 81 and the terminal connection portions 71c, 72c are joined by laser welding or the like.
As shown in FIG. 8, the bus bar holding grooves 89 of the V-phase external connection terminal 82 have a terminal connection portion 73c of the V-phase first bus bar 73 and a terminal connection portion 74c of the V-phase second bus bar 74. Inserted. The busbar holding grooves 89, 89 of the V-phase external connection terminal 82 and the terminal connection portions 73c, 74c are joined by laser welding or the like.
As shown in FIG. 4, terminal connection portions 75 c of the W-phase first bus bar 75 and terminal connection portions 76 c of the W-phase second bus bar 76 are provided in the bus bar holding grooves 89 and 89 of the W-phase external connection terminal 83. Inserted. The bus bar holding grooves 89, 89 of the W-phase external connection terminal 83 and the terminal connection portions 75c, 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. To this end, the first linear portion 71s of the U-phase first bus bar 71 and the first linear portion 72s of the U-phase second bus bar 72 are fitted into the holding portion 66 by snap fitting. Thereby, the first lead wire connecting portion 71a and the second lead wire connecting portion 71b of the U-phase first bus bar 71, the first lead wire connecting portion 72a of the U-phase second bus bar 72, and the second lead wire are connected. The distal end of the second lead 45 is inserted into each of the portions 72b.

  Next, as shown in FIG. 8, the V-phase first bus bar 73 and the V-phase second bus bar 74 are attached to the bus bar holder 61. To this end, the first linear portion 73s of the V-phase first bus bar 73 and the first linear portion 74s of the V-phase second bus bar 74 are respectively fitted to the holding portion 66 by snap fitting. As a result, the first lead wire connecting portion 73a and the second lead wire connecting portion 73b of the V-phase first bus bar 73, the first lead wire connecting portion 74a of the V-phase second bus bar 74, and the second lead wire are connected. The tip of the second lead 45 is inserted into each of the portions 74b.

  Next, as shown in FIG. 4, the W-phase first bus bar 75 and the W-phase second bus bar 76 are attached to the bus bar holder 61. To this end, the first linear portion 75s of the W-phase first bus bar 75 and the first linear portion 76s of the W-phase second bus bar 76 are fitted into the holding portion 66 by snap fitting. Thus, the first lead wire connecting portion 75a and the second lead wire connecting portion 75b of the W-phase first bus bar 75, the first lead wire connecting portion 76a of the W-phase second bus bar 76, and the second lead wire connection. The tip of the second lead 45 is inserted into each of the portions 76b.

  Thereafter, the terminal members 85 are attached to the respective terminal holding portions 69. As a result, the terminal connection portion 71c of the U-phase first bus bar 71 and the terminal connection portion 72c of the U-phase second bus bar 72 are inserted into the bus bar holding grooves 89, 89 of the U-phase external connection terminal 81. The terminal connection portions 73c of the V-phase first bus bar 73 and the terminal connection portions 74c of the V-phase second bus bar 74 are inserted into the bus bar holding grooves 89, 89 of the V-phase external connection terminal 82. The terminal connection portions 75c of the W-phase first bus bar 75 and the terminal connection portions 76c of the W-phase second bus bar 76 are inserted into the bus bar holding grooves 89, 89 of the W-phase external connection terminal 83.

Next, the 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. To this end, the second lead wires 45 are welded to the lead wire connecting portions 71a, 71b, 72a, 72b, 73a, 73b, 74a, 74b, 75a, 75b, 76a, 76b.
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 of the U-phase first bus bar 71 and the second lead wire 45, the pair of extending portions 71 v are sandwiched from outside by the welding jig 100. Hold with. 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 linear portion 71s and an extending portion 71f on both sides thereof via a first end 71d and a second end 71e. As a result, the welding jig 100 sandwiching the first lead wire connecting portion 71a abuts on the first straight portion 71s and the extending portion 71f when a positional shift occurs. Therefore, further displacement of the welding jig 100 is suppressed, and the first lead wire connecting portion 71a is securely held by the welding jig 100.
In order to weld the second lead wire connecting portion 71b of the U-phase first bus bar 71 and the second lead wire 45, the pair of extending portions 71v are sandwiched and held by the welding jig 100 from 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 thereof via a third end 71h and a fourth end 71i. As a result, the welding jig 100 sandwiching the second lead wire connecting portion 71b abuts on the first straight portion 71s and the second straight portion 71t when a positional shift occurs. Therefore, the second lead wire connecting portion 71b is securely held by the welding jig 100.

  Similarly, each of the other 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, Weld while holding the lead wire connection.

  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 The welding with the line 45 is sequentially performed by rotating the bus bar holder 61 around the center axis J with respect to the welding jig 100 and the laser irradiation nozzle for performing the 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.
Thus, the assembly of the bus bar unit 60 is completed.

  According to the present embodiment, the bus bar 70 (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, the W-phase second bus bar 76) are each made of a wire 77. As described above, by using the wire 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. For this reason, 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 from each other. However, it can be manufactured at low cost. As described above, by using the wire 77 for the bus bar 70, it is easy to cope with high-mix low-volume production. Further, it is possible to easily cope with a design change of the bus bar 70. Further, by using the wire rod 77 for the bus bar 70, unnecessary wire rods 77 can be reduced as compared with press working or the like, and the yield of material is improved.

  Each of the lead wire connecting portions 71a, 71b, 72a, 72b, 73a, 73b, 74a, 74b, 75a, 75b, 76a, 76b has a U-shape that opens in the radial direction. Thus, it is not necessary to change the posture of the welding jig 100 in the welding process. Therefore, the manufacturing process can be simplified.

In addition, by providing the first straight portions 71s to 76s, the radial dimension of the bus bar 70 can be easily reduced as compared with the case where the bus bar 70 is curved without providing the straight portion. Therefore, the size of the bus bar 70 and the bus bar unit 60 including the same can be reduced. Further, by providing the first straight line portions 71s to 76s, the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b can be connected at the shortest distance. Thereby, the usage of the wire 77 can be saved.
Therefore, it is possible to reduce the size of the bus bar 70 and to save the amount of wire 77 required for constituting the bus bar 70.

  According to the present embodiment, the second ends 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. Thereby, when welding the first lead wire connecting portions 71a to 76a and the second lead wire 45, it is possible to suppress the welding jig 100 from being displaced. Therefore, 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 second lead wire connecting portions 71b to 76b are provided with the first end portions 71h to 76h and the fourth end portions 71i to 76i, and the first straight line portions on both sides thereof. 71s to 76s and second linear portions 71t to 76t. Accordingly, even when the second lead wire connecting portions 71b to 76b and the second lead wire 45 are welded, it is possible to suppress the displacement of the welding jig 100.
Further, the second straight portions 71t to 76t are parallel to the first straight portions 71s to 76s, and are arranged so as to be shifted from a virtual 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 centered on the central axis J when viewed from above and below. This allows the busbar holder 61 to rotate around the center axis J when welding the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b and the second lead wire 45. If so, there is no need 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 the present 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, respectively. Is held by the holding portion 66 at the first linear portions 71s to 76s. Thereby, the position accuracy with respect to the second lead wire 45 of the first lead wire connection portions 71a to 76a and the second lead wire connection portions 71b to 76b located on both sides of the first straight line portions 71s to 76s is increased. be able to. In addition, when vibration is applied from the outside, it is possible to suppress a 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 sandwiching portion 66 between the first lead wire connecting portions 71a to 76a and the second lead wire connecting 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 improved. In addition, when vibration is applied from the outside, it is possible to suppress a 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 busbars 70 have the intersections J1 to J6 that intersect each other when viewed from above and below, and at the intersections J1 to J6, one of the pair of busbars 70 that intersects each other. , A retreating part 93 passing above the other. Thereby, 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 minimized. Therefore, the size of the bus bar unit 60 can be reduced.
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 holding portion 66. Is done. Thereby, even when vibrations or the like are applied, it is possible to prevent the bus bars 70 from contacting each other at the intersections J1 to J6.
Further, 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, at least the terminal connection portion 71c To 76c and the first lead wire connecting portions 71a to 76a are in the same vertical position. Thus, there is no need to move the welding jig 100 and the laser welding nozzle in the vertical direction. Therefore, the welding process can be performed efficiently.

According to the present 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. Thereby, 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 minimized. Therefore, the size of the bus bar unit 60 can be reduced. In addition, the vertical position of the holding portion 66 can be 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 holding portion 66 is provided between the retracting portions 93, 94, 93A, 93B, 94A, 94B. Keep root. Thereby, the positional accuracy of the terminal connection parts 73c to 76c, the first lead wire connection parts 73a to 76a, and the second lead wire connection parts 73b to 76b can be improved. Further, even when vibration or the like 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 retreating portions 93 and 94 at the portions where the U-phase first bus bar 71 and the U-phase second bus bar 72 intersect. The W-phase first bus bar 75 and the W-phase second bus bar 76 are respectively retracted at 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. It has parts 93A, 93B, 94A, 94B. Thereby, the bus bar 70 is arranged in the order of the U-phase first bus bar 71 and the U-phase second bus bar 72, the V-phase first bus bar 73 and the V-phase second bus bar 74, the W-phase first bus bar 75, and the W-phase second bus bar 76. By assembling with the bus bar holder 61, the bus bar unit 60 can be easily assembled.

  According to the present embodiment, the motor 10 has the busbar unit 60 as described above. Thus, the size of the bus bar 70 can be reduced, and the amount of the wire 77 required for configuring the bus bar 70 can be reduced.

  According to the present embodiment, the motor 10 has the busbar unit 60 as described above. Thus, 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 busbar unit 60 as described above. Thus, the contact between the bus bars 70 can be reliably suppressed, and the welding step 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 a device on which the motor 10 of the present 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 device 2 shown in FIG. 9 is mounted on a steering mechanism of a vehicle wheel. The electric power steering device 2 is a device that reduces the steering force by hydraulic pressure. The electric power steering device 2 includes the motor 10, a steering shaft 214, an oil pump 216, and a control valve 217.

  The steering shaft 214 transmits an input from the steering 211 to an axle 213 having wheels 212. The oil pump 216 generates hydraulic pressure in a power cylinder 215 that transmits a driving force by hydraulic pressure to the axle 213. The control valve 217 controls the oil of the oil pump 216. In the electric power steering device 2, the motor 10 is mounted as a drive source of the oil pump 216.

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

  As described above, the embodiments of the present invention have been described. However, each configuration and the combination thereof in the embodiments are merely examples, and addition, omission, substitution, and other changes of the configurations are possible without departing from the gist of the present invention. Is possible. The present invention is not limited by the embodiments.

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

  Further, in the above-described embodiment, each of the bus bars 70 is provided with the first lead wire connecting portions 71a to 76a and the second lead wire connecting portions 71b to 76b, but only one lead wire connecting portion 71a to 76b is provided. May be provided, and three or more lead wire connection parts may be provided.

  The above configurations can be appropriately combined within a range not mutually inconsistent.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 30 ... Rotor, 40 ... Stator, 60 ... Busbar unit, 61 ... Busbar holder, 66 ... Holding part, 70 ... Busbar, 70U ... Busbar group for U phase (1st type busbar), 70V ... Vphase Busbar group (second type busbar), 70W... W-phase busbar group (third type busbar), 71... U-phase first busbar, 71a to 76a... First lead wire connecting portion (lead wire connecting portion) ), 71b to 76b: second lead wire connection portion (lead wire connection portion), 71c to 76c: terminal connection portion, 71d to 76d: first end portion, 71e to 76e: second end portion, 71f to 76f: extending 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-phase 1 bus bar, 74: V-phase second bus bar, 75: W-phase first bus bar, 76: W-phase second bus bar, 77: wire, 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: Evacuation portion, J: Central axis, J1 to J6: Intersection, L: Virtual line

Claims (6)

A busbar unit provided in the motor,
A busbar holder provided on one axial side of a stator arranged annularly around a central axis extending in the vertical direction;
A plurality of busbars extending along a plane perpendicular to the axial direction and fixed to the busbar holder;
An external connection terminal connected to the bus bar and extending upward from the bus bar,
The bus bar is made of a wire rod,
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,
The plurality of busbars have at least the terminal connection portions and the lead wire connection portions in the same axial position, and have crossing portions that intersect each other when viewed from the axial direction,
In the intersection, any one of the pair of bus bars that intersect with each other further includes a retreating part that passes over the other side,
The bus bar unit, wherein the bus bar holder has a holding portion that holds the bus bar by holding the bus bar.   2. The bus bar unit according to claim 1, wherein the bus bar is held by the holding portion in the same axial position including the terminal connection portion and the lead wire connection portion. 3.   The busbar unit according to claim 2, wherein the holding portion holds a root of the retracting portion.   The bus bar unit according to any one of claims 1 to 3, wherein the bus bar includes a plurality of the lead line connecting portions, and is held by the holding portion between the lead line connecting 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 retreat portion at a portion that intersects with the first type bus bar,
The bus bar unit according to any one of claims 1 to 4, wherein the third type bus bar has the retreating portion at a portion intersecting the first type bus bar and the second type bus bar. A motor having the busbar unit according to any one of claims 1 to 5,
Said stator around which a coil wire is wound;
A motor comprising: the stator; and a rotor radially opposed to the stator via a gap.

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