WO2018180446A1 - Bus bar unit and motor - Google Patents

Abstract

A bus bar unit has: a bus bar holder; and a U-phase bus bar group, a V-phase bus bar group, and a W-phase bus bar group. The U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group each have: a first layer bus bar positioned on one side of the bus bar holder in the axial direction and extending along a plane orthogonal to the axial direction; a second layer bus bar positioned on one side of the first layer bus bar in the axial direction and extending along a plane orthogonal to the axial direction; and an external connection terminal connected to the first layer bus bar and the second layer bus bar and extending from the first layer bus bar and the second layer bus bar toward one side in the axial direction. In the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group, the first layer bus bar and the second layer bus bar each extend from the external connection terminal connected thereto toward mutually opposite sides in the circumferential direction.

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 terminal ends of coils of each phase of the motor are connected. The bus bar is connected to a connector for supplying power to the coils of each phase from the outside of the motor.
For example, Patent Literature 1 describes a bus bar unit including a C-shaped bus bar (terminal) extending along the circumferential direction of a motor. In this bus bar unit, the bus bars for each phase are arranged in a stacked manner in the axial direction of the motor.

JP2015-142429A

In the bus bar unit as described above, the number of bus bars according to the number of phases of the motor is stacked. The motor described in Patent Document 1 is a three-phase motor. Therefore, three bus bars are stacked in the axial direction of the motor. As a result, the bus bar unit is limited in suppressing the size of the motor in the axial direction.
In addition, a magnetic field generated by a current flowing through a bus bar extending in a C shape may affect the outside of the motor.

In view of the above circumstances, an object of the present invention is to provide a bus bar unit that can be miniaturized and can suppress the external influence of a magnetic field.

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 arranged annularly around a central axis extending in the vertical direction, and the bus bar holder A U-phase bus bar group, a V-phase bus bar group, and a W-phase bus bar group that are fixed to each other. The U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group are each positioned on one side in the axial direction of the bus bar holder and extend along a plane orthogonal to the axial direction. And a second layer bus bar located on one axial side of the first layer bus bar and extending along a plane orthogonal to the axial direction, connected to the first layer bus bar and the second layer bus bar, A layer bus bar and an external connection terminal extending from the second layer bus bar to one side in the axial direction. The first layer bus bar and the second layer bus bar are connected to a lead line extending from the stator. In the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group, the first layer bus bar and the second layer bus bar are opposite to each other in the circumferential direction from the connected external connection terminal. It has the structure extended to the side.

According to one aspect of the present invention, there is provided a bus bar unit that can be reduced in size and can suppress the external influence of a magnetic field.

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 perspective view illustrating a configuration of a stator according to an embodiment. FIG. 3 is a perspective view of the bus bar holder according to the embodiment as viewed obliquely from above. FIG. 4 is a perspective view of the bus bar holder according to the embodiment as viewed obliquely from below. FIG. 5 is a perspective view illustrating a state where the bus bar is assembled to the bus bar holder according to the embodiment. FIG. 6 is a perspective view showing a first-layer bus bar of the bus bar according to the embodiment. FIG. 7 is a perspective view showing a second layer bus bar of the bus bar of the embodiment. FIG. 8 is a perspective view showing a state in which the first layer bus bar of the embodiment is assembled to the bus bar holder. FIG. 9 is a perspective view illustrating a state in which the second layer bus bar according to the embodiment is assembled to the bus bar holder. FIG. 10 is a perspective view illustrating an external connection terminal of the bus bar according to the embodiment. FIG. 11 is a plan view illustrating external connection terminals of the bus bar according to the embodiment. FIG. 12 is a diagram illustrating a terminal piece used when manufacturing an external connection terminal according to an embodiment. FIG. 13 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. In FIG. 1 and FIG. 2, 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 FIGS. 1 and 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”, a radial direction centered on the central axis J is simply referred to as “radial direction”, and a circumferential direction centered on the central axis J is referred to as “circumferential direction”. It 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”. 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 to the rotor core 32 directly or indirectly. 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. 1 and 2, 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 (coil wire) 43 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.

As shown in FIG. 1, 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 43 has four U-phase coils 43U, four V-phase coils 43V, and four W-phase coils 43W. In this embodiment, the connection method of the coil 43 is a so-called Y connection method. U-phase coil 43U, V-phase coil 43V, and W-phase coil 43W are arranged adjacent to each other in this order in the circumferential direction. In the present embodiment, there are four sets of the coils 43 including the U-phase coil 43U, the V-phase coil 43V, and the W-phase coil 43W.

The coil (coil wire) 43 is wound around the teeth 41 b via the insulator 42.
Each coil 43 (U-phase coil 43U, V-phase coil 43V, W-phase coil 43W) has a first lead wire 44 and a second lead wire (lead wire) 45. The first lead line 44 and the second lead line 45 extend upward in the vertical direction. In each coil 43, the first lead wire 44 is located radially outside the second lead wire 45. Further, in each coil 43, 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 43. 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.

Each set of U-phase coil 43U, V-phase coil 43V and W-phase coil 43W is electrically connected by a neutral point bus bar 48. The neutral point bus bar 48 is located on the radially inner side of the flange portion 42 f of the insulator 42. The neutral point bus bar 48 is made of a conductive metal plate. 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 portion 48b extends radially inward from the bus bar main body 48a. A substantially U-shaped holding groove is provided at the tip of the coil wire holding portion 48b. Three coil wire holding portions 48b are provided at intervals in the circumferential direction of the bus bar main body 48a.
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 is electrically connected to the first lead wire 44 of each set of U-phase coil 43U, V-phase coil 43V, and W-phase coil 43W. In each of the U-phase coil 43U, the V-phase coil 43V, and the W-phase coil 43W, the end portion of the first lead wire 44 is sandwiched between the holding grooves of the coil wire holding portion 48b. In this way, the ends of the three first lead wires 44 drawn from the U-phase coil 43U, the V-phase coil 43V, and the W-phase coil 43W of each set are coil wires of one neutral point bus bar 48. It is electrically connected to the holding part 48b. The coil wire holding portion 48b and the first lead wire 44 are preferably fixed by caulking. Further, the coil wire holding portion 48b and the end portion of the first lead wire 44 are fixed by laser welding or the like. Thereby, in each set, U-phase coil 43U, V-phase coil 43V, and W-phase coil 43W are electrically connected to neutral point bus bar 48.

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. 3 is a perspective view of the bus bar holder according to the embodiment as viewed obliquely from above.
As shown in FIG. 3, 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 triangular 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 leader line support hole 62. The lead wire support hole 62 penetrates the bus bar holder 61 in the vertical direction. A plurality of lead wire support holes 62 are provided at intervals in the circumferential direction. In the present embodiment, the number of lead wire support holes 62 is the same as the number of second lead wires 45. That is, the number of lead wire support holes 62 is twelve.
The bus bar holder 61 has a recess 63 that is recessed downward in the vertical direction on the upper surface. The recess 63 is provided around each lead wire support hole 62.

FIG. 4 is a perspective view of the bus bar holder according to the embodiment as viewed obliquely from below.
As shown in FIG. 4, the bus bar holder 61 has a leader guide portion 64 on the lower surface. A plurality of lead wire guide portions 64 are provided at intervals in the circumferential direction. The number of lead wire guide portions 64 is the same as the number of lead wire support holes 62.
Each leader line guide portion 64 is cylindrical and extends downward in the vertical direction. The leader line guide portion 64 surrounds the outer peripheral side of the leader line support hole 62 on the lower surface of the bus bar holder 61.

A reinforcing base portion 64b is provided at the upper end of the lead wire guide portion 64. The reinforcing base portion 64 b extends from the outer surface of the lead wire guide portion 64 toward the radially outer side along the bus bar holder 61. Due to the reinforcing base portion 64b, the bus bar holder 61 has a large thickness in the vertical direction on the outer peripheral side of each leader line guide portion 64. Thereby, the rigidity of the leader line guide part 64 increases.

As shown in FIG. 3, the bus bar holder 61 has, on its upper surface, a first clamping part (clamping part) 65, a second clamping part (clamping part) 66, a third clamping part 67, and a bus bar support base 68. Terminal holding portion 69.
The first clamping portion 65 is provided on the radially outer side of the through hole 61 h of the bus bar holder 61. A plurality of first clamping portions 65 are provided with a circumferential direction therebetween. In the present embodiment, three first clamping portions 65 are provided at equal intervals in the circumferential direction. Each first clamping part 65 has a pair of claw members 65a. Each claw member 65a extends upward in the vertical direction. The pair of claw members 65a oppose each other with a gap in the radial direction. The distance between the pair of claw members 65a is narrower than the width of the first bus bar extending portion 73a described later. The pair of claw members 65a are elastically deformed and sandwich the first bus bar extending portion 73a.

Two second sandwiching portions 66 are provided between the first sandwiching portions 65 adjacent to each other in the circumferential direction. The 2nd clamping part 66 has a pair of nail | claw member 66a. The pair of claw members 66a oppose each other with a gap in the radial direction. The second clamping portion 66 protrudes upward in the vertical direction from the upper surface of the bus bar holder 61. The second clamping unit 66 has an axial height lower than that of the first clamping unit 65. The distance between the pair of claw members 66a is narrower than the width of the first bus bar extending portion 73a described later. The pair of claw members 66a are elastically deformed and sandwich the first bus bar extending portion 73a.

3rd clamping part 67 is provided in the outer peripheral part of the bus-bar holder 61. As shown in FIG. A plurality of third clamping portions 67 are provided in the circumferential direction. In the present embodiment, six third sandwiching portions 67 are provided at intervals in the circumferential direction. Each third clamping portion 67 has a pair of claw members 67a. The pair of claw members 67a oppose each other with a gap in the radial direction. Each claw member 67a extends upward in the vertical direction. The third clamping part 67 has substantially the same axial height as the first clamping part 65. Moreover, the 3rd clamping part 67 has the height of an axial direction higher than a 2nd clamping part.

As will be described later, the second clamping unit 66 clamps the first layer bus bar 71. Further, the first sandwiching portion 65 and the third sandwiching portion 67 sandwich the second layer bus bar 72 passing through the upper side in the axial direction from the first layer bus bar 71. According to the present embodiment, the axial height of the sandwiching portion (second sandwiching portion 66) sandwiching the first layer bus bar 71 is the same as the sandwiching portion (first sandwiching portion 65 and third sandwiching portion) sandwiching the second layer bus bar 72. The height in the axial direction of the portion 67) is lower. That is, the axial position of the tip of the second clamping part 66 and the axial position of the tip of the first clamping part and the third clamping part 67 are different from each other.

The bus bar support stand 68 is provided on the outer peripheral portion of the bus bar holder 61. A plurality of bus bar support stands 68 are provided in the circumferential direction. In the present embodiment, three bus bar support stands 68 are provided at intervals in the circumferential direction. Each bus bar support base 68 is disposed adjacent to one side in the circumferential direction with respect to the terminal holding portion 69. The bus bar support base 68 protrudes upward in the vertical direction from the upper surface of the bus bar holder 61. The bus bar support base 68 has an axial height lower than that of the third sandwiching portion 67.

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 are opposed to each other with a gap in the radial direction. The columnar members 69a and 69b extend from the upper surface of the bus bar holder 61 to the upper side in the vertical direction. The columnar members 69a and 69b have holding grooves 69m and 69n. The holding grooves 69m and 69n extend from the upper ends of the columnar members 69a and 69b downward in the vertical direction (that is, along the axial direction) to the middle in the vertical direction of the columnar members 69a and 69b. The upper ends of the holding grooves 69m and 69n are opened upward at the upper ends of the columnar members 69a and 69b.
The columnar member 69a located on the radially inner side has a wall portion 69w that extends radially outward from one end in the circumferential direction. A gap is provided in the circumferential direction between the wall 69w of the columnar member 69a and the columnar member 69b.

The bus bar holder 61 is located above the first lead wire 44 extending upward in the vertical direction from each coil 43 of the stator 40 shown in FIG. The second leader line 45 passes through the leader line support hole 62 through the inside of the leader line guide portion 64 and projects to the upper surface side of the bus bar holder 61.
On the lower surface side of the bus bar holder 61, the periphery of the second lead wire 45 is surrounded by a lead wire guide portion 64. Accordingly, the second lead wire 45 is prevented from being short-circuited by being in contact with the first lead wire 44, the other second lead wire 45, the neutral point bus bar 48, the coil 43, etc. on the lower side of the bus bar holder 61. Is done.

FIG. 5 is a perspective view illustrating a state where the bus bar is assembled to the bus bar holder according to the embodiment. FIG. 6 is a perspective view showing a first-layer bus bar of the bus bar according to the embodiment. FIG. 7 is a perspective view showing a second layer bus bar of the bus bar of the embodiment.
As shown in FIG. 5, the bus bar 70 is fixed to the bus bar holder 61. Bus bar 70 includes a U-phase bus bar group 70U, a V-phase bus bar group 70V, and a W-phase bus bar group 70W.
U-phase bus bar group 70U includes U-phase first layer bus bar 71U, U-phase second layer bus bar 72U, and U-phase external connection terminal (external connection terminal) 80U.
The V-phase bus bar group 70V includes a V-phase first layer bus bar 71V, a V-phase second layer bus bar 72V, and a V-phase external connection terminal (external connection terminal) 80V.
The W-phase bus bar group 70W includes a W-phase first layer bus bar 71W, a W-phase second layer bus bar 72W, and a W-phase external connection terminal (external connection terminal) 80W.
The U-phase bus bar group 70U, the V-phase bus bar group 70V, and the W-phase bus bar group 70W are arranged in rotational symmetry every 120 ° with the central axis J as the center.

The bus bar 70 includes first layer bus bars (first bus bars) and 71, and second layer bus bars (bus bars) and 72.
As shown in FIG. 6, the first layer bus bar 71 includes a U-phase first layer bus bar 71U, a V-phase first layer bus bar 71V, and a W-phase first layer bus bar 71W. The U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W have the same axial position.
As shown in FIG. 7, second layer bus bar 72 includes a U phase second layer bus bar 72U, a V phase second layer bus bar 72V, and a W phase second layer bus bar 72W. The U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W have the same axial position.
As shown in FIG. 5, U-phase second-layer bus bar 72U, V-phase second-layer bus bar 72V, and W-phase second-layer bus bar 72W are composed of U-phase first-layer bus bar 71U, V-phase first-layer bus bar 71V, and W-phase. It is arranged on the upper side in the vertical direction (one side in the axial direction) with respect to the first layer bus bar 71W.

FIG. 8 is a perspective view showing a state in which the first layer bus bar of the embodiment is assembled to the bus bar holder.
As shown in FIG. 8, U-phase first layer bus bar 71U, V-phase first layer bus bar 71V, and W-phase first layer bus bar 71W are located above bus bar holder 61 (one side in the axial direction). U-phase first layer bus bar 71U, V-phase first layer bus bar 71V, and W-phase first layer bus bar 71W each extend along a plane orthogonal to the up-down direction. U-phase first layer bus bar 71U, V-phase first layer bus bar 71V, and W-phase first layer bus bar 71W are each plate-shaped. The U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W are arranged with the axial direction as the plate thickness direction.

As shown in FIG. 6, the U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W are each composed of a first bus bar member 73 having the same shape. The first bus bar member 73 is manufactured by punching a metal plate that is a conductive material. The U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W do not require a plurality of molds, devices, and jigs when they are manufactured. Therefore, the manufacturing process of the U-phase first-layer bus bar 71U, the V-phase first-layer bus bar 71V, and the W-phase first-layer bus bar 71W can be simplified, and the manufacturing cost can be reduced.

The first bus bar member 73 includes a first bus bar extending portion (first extending portion) 73a, a second bus bar extending portion 73b, and a third bus bar extending portion 73c. The first bus bar extending portion 73a, the second bus bar extending portion 73b, and the third bus bar extending portion 73c each extend in a straight line when viewed from the vertical direction.
The first bus bar extending portion 73a extends in a direction orthogonal to the radial direction.
The second bus bar extending portion 73b has an end portion on one side in the longitudinal direction connected to an end portion on the other side in the longitudinal direction of the first bus bar extending portion 73a. The second bus bar extending portion 73b is bent and extends at a different angle with respect to the first bus bar extending portion 73a.
The third bus bar extending portion 73c has an end portion on one side in the longitudinal direction connected to an end portion on the other side in the longitudinal direction of the second bus bar extending portion 73b via a bent portion 73k. The bent portion 73k is bent outward in the radial direction from the end portion on the other side in the longitudinal direction of the second bus bar extending portion 73b.

The first bus bar member 73 further includes lead wire connecting portions 73d and 73e and a terminal insertion hole (first through hole) 73h.
The lead wire connecting portion 73d is provided at the end portion on one side in the longitudinal direction of the first bus bar extending portion 73a. The lead wire connecting portion 73d extends radially outward from an end portion on one side in the longitudinal direction of the first bus bar extending portion 73a. A lead wire holding groove 78 is provided at the radially outer tip of the lead wire connecting portion 73d. The lead wire holding groove 78 opens to the outside in the radial direction at the leading end portion of the lead wire connecting portion 73d. The leader line holding groove 78 can also be expressed as a notch that opens radially outward. The lead wire holding groove 78 has an introduction groove 78a and a holding groove 78b. The introduction groove 78a is provided on the distal end side of the lead wire connecting portion 73d. The introduction groove portion 78 a has a groove width that is narrower than the outer diameter of the second lead wire 45. The holding groove portion 78b is provided continuously on the radially inner side with respect to the introduction groove portion 78a. The holding groove portion 78 b has an arc shape having an inner diameter slightly larger than the outer diameter of the second lead wire 45.

The lead wire connecting portion 73e is provided at the end portion on one side in the longitudinal direction of the second bus bar extending portion 73b. The lead wire connecting portion 73e extends radially outward from an end portion on one side in the longitudinal direction of the second bus bar extending portion 73b. The lead wire connecting portion 73e has a lead wire holding groove 78 at the distal end portion on the radially outer side, like the lead wire connecting portion 73d. The lead wire holding groove 78 is open to the outside in the radial direction at the tip portion of the lead wire connecting portion 73e. The lead wire holding groove 78 has an introduction groove 78a and a holding groove 78b.

The terminal insertion hole 73h is provided at an end portion on the other side in the longitudinal direction of the third bus bar extending portion 73c. The terminal insertion hole 73h penetrates the first bus bar member 73 in the vertical direction.

As shown in FIG. 8, the U-phase first-layer bus bar 71U, the V-phase first-layer bus bar 71V, and the W-phase first-layer bus bar 71W are triangular when viewed from above and below when placed on the bus bar holder 61. Are arranged to constitute.
In the U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W, both longitudinal ends of the first bus bar extending portions 73a are connected to the second holding portions 66 of the bus bar holder 61. It is pinched. The first bus bar extending portion 73a is sandwiched between the pair of claw members 66a in each second sandwiching portion 66. The distance between the pair of claw members 66a is narrower than the width of the first bus bar extending portion 73a. For this reason, by sandwiching the first bus bar extending portion 73a between the pair of claw members 66a, the pair of claw members 66a are elastically deformed, and the second holding portion 66 firmly holds the first bus bar extending portion 73a. .
In this way, the U-phase first-layer bus bar 71U, the V-phase first-layer bus bar 71V, and the W-phase first-layer bus bar 71W each have two second holding portions 66 between the lead wire connection portions 73d and 73e. Retained.

U-phase first layer bus bar 71U is connected to second lead wire 45 of U-phase coil 43U. V-phase first layer bus bar 71V is connected to second lead wire 45 of V-phase coil 43V, and W-phase first layer bus bar 71W is connected to second lead wire 45 of V-phase coil 43V.
In the U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W, the second lead wire 45 is electrically connected to the lead wire connecting portions 73d and 73e. In the lead wire connecting portions 73d and 73e, the leading end portion of the second lead wire 45 protruding upward from the bus bar holder 61 is inserted into the holding groove portion 78b (see FIG. 6). Leader line connecting portions 73d and 73e into which the leading end portion of the second lead wire 45 is inserted are crimped by sandwiching both sides of the introduction groove portion 78a with a tool (not shown). Then, the front-end | tip part of the 2nd leader line 45 and the leader line connection parts 73d and 73e are laser-welded. Thereby, leader line connection part 73d, 73e and the 2nd leader line 45 are connected easily and reliably.

The U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, and the W-phase first layer bus bar 71W held by the bus bar holder 61 are each provided with a terminal insertion hole 73h on the other side in the circumferential direction of the terminal holding portion 69. Located in.

FIG. 9 is a perspective view illustrating a state in which the second layer bus bar according to the embodiment is assembled to the bus bar holder.
As shown in FIG. 9, U-phase second-layer bus bar 72U, V-phase second-layer bus bar 72V, and W-phase second-layer bus bar 72W are composed of U-phase first-layer bus bar 71U, V-phase first-layer bus bar 71V, and W-phase. It is located above the first layer bus bar 71W in the vertical direction. U-phase second-layer bus bar 72U, V-phase second-layer bus bar 72V, and W-phase second-layer bus bar 72W extend along a plane orthogonal to the vertical direction. U-phase second-layer bus bar 72U, V-phase second-layer bus bar 72V, and W-phase second-layer bus bar 72W each have a plate shape. The U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W are arranged with the axial direction as the plate thickness direction.
As shown in FIG. 7, the U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W are each composed of a second bus bar member 74 having the same shape. The second bus bar member 74 is manufactured by punching a metal plate that is a conductive material.

The second bus bar member 74 includes a fourth bus bar extending portion (second extending portion) 74a, a fifth bus bar extending portion 74b, and a sixth bus bar extending portion 74c. The fourth bus bar extending portion 74a, the fifth bus bar extending portion 74b, and the sixth bus bar extending portion 74c each extend in a straight line when viewed from the vertical direction.
The fourth bus bar extending portion 74a extends in a direction orthogonal to the radial direction.
The fifth bus bar extending portion 74b has an end on one side in the longitudinal direction connected to an intermediate portion in the longitudinal direction of the fourth bus bar extending portion 74a. The fifth bus bar extending portion 74b is connected to the fourth bus bar extending portion 74a via the connecting portion 74j. The connecting portion 74j extends radially outward from the fourth bus bar extending portion 74a. The fifth bus bar extending portion 74b extends substantially parallel to the fourth bus bar extending portion 74a.
The end of one side in the longitudinal direction of the sixth bus bar extension part 74c is connected to the end of the other side in the longitudinal direction of the fifth bus bar extension part 74b. The sixth bus bar extending portion 74c extends at a different angle with respect to the fifth bus bar extending portion 74b.

The second bus bar member 74 further includes lead wire connecting portions 74d and 74e and a terminal insertion hole (second through hole) 74h.
The lead wire connecting portion 74d is provided at the end portion on one side in the longitudinal direction of the fourth bus bar extending portion 74a. The lead wire connecting portion 74d extends radially outward from an end portion on one side in the longitudinal direction of the fourth bus bar extending portion 74a. The lead wire connecting portion 74d has a lead wire holding groove 79 at the distal end portion on the radially outer side. The lead wire holding groove 79 is open to the outside in the radial direction at the tip portion of the lead wire connecting portion 74d. The lead wire holding groove 79 has an introduction groove 79a and a holding groove 79b. The introduction groove 79a is provided on the leading end side of the lead wire connecting portion 74d. The introduction groove portion 79 a has a groove width that is narrower than the outer diameter of the second lead wire 45. The holding groove 79b is continuously provided radially inward with respect to the introduction groove 79a. The holding groove 79 b has an arc shape having an inner diameter slightly larger than the outer diameter of the second lead wire 45.

The lead wire connecting portion 74e is provided at the end portion on the other side in the longitudinal direction of the fourth bus bar extending portion 74a. The lead wire connecting portion 74e extends radially outward from the end portion on the other side in the longitudinal direction of the fourth bus bar extending portion 74a. The lead wire connecting portion 74e has a lead wire holding groove 79 at the distal end portion on the radially outer side, like the lead wire connecting portion 74d. The lead wire holding groove 79 is open to the outside in the radial direction at the tip portion of the lead wire connecting portion 74e. The lead wire holding groove 79 has an introduction groove 79a and a holding groove 79b.

The terminal insertion hole 74h is provided at the end portion on the other side in the longitudinal direction of the sixth bus bar extending portion 74c. The terminal insertion hole 74h penetrates the second bus bar member 74 in the vertical direction.

As shown in FIG. 9, the U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W are arranged on the bus bar holder 61 so as to form a triangle when viewed from above and below. Is done.
A triangle composed of a U-phase first-layer bus bar 71U, a V-phase first-layer bus bar 71V and a W-phase first-layer bus bar 71W, a U-phase second-layer bus bar 72U, a V-phase second-layer bus bar 72V and a W-phase second The triangle formed by the layer bus bar 72W is arranged with a different apex position. When viewed from the vertical direction, one of the vertices of the triangle formed by the first layer bus bar 71 faces upward in the drawing. On the other hand, one of the vertices of the triangle formed by the second layer bus bar 72 faces downward in the figure.
In addition, the lead- line connecting portions 73d and 73e of the U-phase first-layer bus bar 71U, the V-phase first-layer bus bar 71V, and the W-phase first-layer bus bar 71W, the U-phase second-layer bus bar 72U, and the V-phase second-layer bus bar 72V And the lead wire connection portions 74d and 74e of the W-phase second layer bus bar 72W are different from each other in the circumferential direction.

In the U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W, the fourth bus bar extending portions 74a are respectively provided with a U-phase first-layer bus bar 71U and a V-phase first-layer bus bar 71V. And it is located on the opposite side across the first bus bar extending portion 73a of the W-phase first layer bus bar 71W and the central axis J. In U-phase second layer bus bar 72U, V-phase second layer bus bar 72V, and W-phase second layer bus bar 72W, each fourth bus bar extending portion 74a and first bus bar extending portion 73a extend in parallel to each other.

In the U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W, the longitudinal intermediate portion of the fourth bus bar extending portion 74a is connected to the first holding portion 65 of the bus bar holder 61, respectively. It is pinched. The fourth bus bar extending portion 74a is sandwiched between the pair of claw members 65a in each first sandwiching portion 65. The distance between the pair of claw members 65a is narrower than the width of the fourth bus bar extending portion 74a. For this reason, by sandwiching the fourth bus bar extending portion 74a between the pair of claw members 65a, the pair of claw members 65a are elastically deformed, and the first clamping portion 65 firmly holds the fourth bus bar extending portion 74a. .
In this way, the U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W are held in the first clamping portion 65 between the lead wire connecting portions 74d and 74e, respectively. Is done.

Further, in the U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W, the longitudinal intermediate portion of each fifth bus bar extending portion 74b is the third clamping portion of the bus bar holder 61. 67. The fifth bus bar extending portion 74 b is sandwiched between the pair of claw members 67 a in the third sandwiching portion 67. The interval between the pair of claw members 67a is narrower than the width of the fifth bus bar extending portion 74b. For this reason, by sandwiching the fifth bus bar extending portion 74b between the pair of claw members 67a, the pair of claw members 67a are elastically deformed, and the third clamping portion 67 firmly holds the fifth bus bar extending portion 74b. .
In this way, the U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W are held by the bus bar holder 61, respectively.

Also, in the U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W, both longitudinal ends of the fourth bus bar extending portions 74a are the second sandwiching portions of the bus bar holder 61. 66 is supported. The U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W are supported on the second sandwiching portion 66 so that the U-phase second-layer bus bar 72W is sandwiched by the second sandwiching portion 66. A clearance is secured in the vertical direction among the first layer bus bar 71U, the V phase first layer bus bar 71V, and the W phase first layer bus bar 71W. Thereby, the U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V and the W-phase first layer bus bar 71W, the U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V and the W-phase second layer bus bar. Avoid short circuit with 72W.

The U-phase second layer bus bar 72U is connected to the second lead wire 45 of the U-phase coil 43U. V-phase second layer bus bar 72V is connected to second lead wire 45 of V-phase coil 43V, and W-phase second layer bus bar 72W is connected to second lead wire 45 of V-phase coil 43V.

In the U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W, the second lead wire 45 is electrically connected to the respective lead wire connecting portions 74d and 74e. In the lead wire connecting portions 74d and 74e, the leading end portion of the second lead wire 45 protruding upward from the bus bar holder 61 is inserted into the holding groove portion 79b. Leader wire connecting portions 74d and 74e into which the leading end portion of the leader wire 45 is inserted are crimped by sandwiching both sides of the introduction groove 79a with a tool (not shown). Then, the front-end | tip part of the 2nd leader line 45 and the leader line connection parts 74d and 74e are laser-welded. Thereby, leader line connection parts 74d and 74e and the 2nd leader line 45 are connected easily and reliably.

In the U-phase second layer bus bar 72U, the V-phase second layer bus bar 72V, and the W-phase second layer bus bar 72W, the respective sixth bus bar extending portions 74c are supported on the bus bar support base 68 of the bus bar holder 61. Accordingly, the terminal insertion hole 74 h provided in the sixth bus bar extending portion 74 c is located on the other circumferential side of the terminal holding portion 69.

Thus, when viewed from the axial direction, the first layer bus bar 71U of the U-phase bus bar group 70U is located below the second layer bus bars 72V and 72W of the V-phase bus bar group 70V and the W-phase bus bar group 70W. pass. The first layer bus bar 71V of the V-phase bus bar group 70V passes below the second layer bus bars 72U and 72W of the U-phase bus bar group 70U and the W-phase bus bar group 70W. The first layer bus bar 71W of the W phase bus bar group 70W passes below the second layer bus bars 72U and 72V of the U phase bus bar group 70U and the V phase bus bar group 70V.

As shown in FIG. 5, the U-phase external connection terminal 80U, the V-phase external connection terminal 80V, and the W-phase external connection terminal 80W are held by the terminal holding portion 69 of the bus bar holder 61, respectively. U-phase external connection terminal 80U is connected to U-phase first layer bus bar 71U and U-phase second layer bus bar 72U. V-phase external connection terminal 80V is connected to V-phase first layer bus bar 71V and V-phase second layer bus bar 72V. W-phase external connection terminal 80W is connected to W-phase first layer bus bar 71W and W-phase second layer bus bar 72W.

The U-phase first layer bus bar 71U and the U-phase second layer bus bar 72U extend from the connected U-phase external connection terminal 80U to the opposite sides in the circumferential direction. V-phase first layer bus bar 71V and V-phase second layer bus bar 72V extend from opposite V-phase external connection terminals 80V to opposite sides in the circumferential direction. W-phase first layer bus bar 71W and W-phase second layer bus bar 72W extend from the connected W-phase external connection terminal 80W to opposite sides in the circumferential direction.

The U-phase external connection terminal 80U, the V-phase external connection terminal 80V, and the W-phase external connection terminal 80W are each plate-shaped. The U-phase external connection terminal 80U, the V-phase external connection terminal 80V, and the W-phase external connection terminal 80W are composed of terminal members 81 having the same shape. The terminal member 81 is manufactured by pressing a metal plate that is a conductive material.

According to the present embodiment, since the second layer bus bars 72U, 72V, 72W are arranged above the first layer bus bars 71U, 71V, 71W, the U-phase, V-phase, and W-phase bus bars 70 are moved up and down. It can be arranged in two layers. Thereby, the bus bar unit 60 can be downsized in the vertical direction. Moreover, if it is going to arrange | position only one layer, without overlapping the bus-bar 70, in order to avoid interference between bus-bars, it enlarges to radial direction. On the other hand, the bus bar unit 60 can be prevented from being enlarged in the radial direction.

Further, the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W extend in the circumferential direction opposite to the external connection terminals 80U, 80V, 80W. For this reason, the direction of the current flowing through each of the first layer bus bars 71U, 71V, 71W and the current flowing through each of the second layer bus bars 72U, 72V, 72W are mutually opposite with the external connection terminals 80U, 80V, 80W interposed therebetween. The opposite direction. The magnetic field generated by the first layer bus bars 71U, 71V, 71W and the magnetic field generated by the second layer bus bars 72U, 72V, 72W located on the other radial side are opposite to each other across the central axis J. As a result, the magnetic field generated by the first layer bus bars 71U, 71V, 71W and the magnetic field generated by the second layer bus bars 72U, 72V, 72W can be offset from each other, and the influence on the outside can be suppressed.
Therefore, it is possible to reduce the size of the bus bar unit 60 and suppress the external influence of the magnetic field.

According to the present embodiment, the first bus bar extending portion 73a of the first layer bus bars 71U, 71V, 71W and the fourth bus bar extending portion 74a of the second layer bus bars 72U, 72V, 72W sandwich the central axis J. Located on the opposite side. This increases the effect of canceling out the magnetic field generated by the first layer bus bars 71U, 71V, 71W and the magnetic field generated by the second layer bus bars 72U, 72V, 72W, and can effectively suppress the influence on the outside.

According to the present embodiment, the first bus bar extending portion 73a and the fourth bus bar extending portion 74a extend in parallel to each other. This further increases the effect of canceling out the magnetic field generated by the first layer bus bars 71U, 71V, 71W and the magnetic field generated by the second layer bus bars 72U, 72V, 72W, and can further effectively suppress the influence on the outside. .

According to this embodiment, the first layer bus bar 71U of the U-phase bus bar group 70U passes below the second layer bus bars 72V and 72W of the V-phase bus bar group 70V and the W-phase bus bar group 70W. The first layer bus bar 71V of the V-phase bus bar group 70V passes below the second layer bus bars 72U and 72W of the U-phase bus bar group 70U and the W-phase bus bar group 70W. The first layer bus bar 71W of the W phase bus bar group 70W passes below the second layer bus bars 72U and 72V of the U phase bus bar group 70U and the V phase bus bar group 70V.
In this way, the U-phase, V-phase, and W-phase bus bars 70 can be arranged efficiently and stacked in two layers. Thereby, the bus bar unit 60 can be reduced in size.

According to the present embodiment, the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W are plate-like, and are arranged with the axial direction as the thickness direction. Thereby, the bus bar unit 60 can be reduced in size in the axial direction.

According to the present embodiment, the axial positions of the first layer bus bars 71U, 71V, 71W are matched, and the axial positions of the second layer bus bars 72U, 72V, 72W are matched.
Thereby, the U-phase, V-phase, and W-phase bus bars 70 can be efficiently arranged and arranged in two upper and lower layers. Thereby, the bus bar unit 60 can be reduced in size.

According to the present embodiment, the first layer bus bars 71U, 71V, 71W have the same shape, and the second layer bus bars 72U, 72V, 72W have the same shape. Thereby, the 1st bus bar 71U, 71V, 71W can use the 1st bus bar member 73 of the same shape. The second bus bar member 74 having the same shape can also be used for the second layer bus bars 72U, 72V, 72W. Thereby, the number of types of parts constituting the bus bar unit 60 can be reduced. As a result, component costs can be reduced. Further, the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W only need to be attached with the same type of components, and there is no need to attach different components for each phase. Therefore, the work of attaching the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W can be performed efficiently.

According to this embodiment, the U-phase bus bar group 70U, the V-phase bus bar group 70V, and the W-phase bus bar group 70W are arranged symmetrically about 120 ° with the central axis J as the center. Thereby, the first layer bus bars 71U, 71V, 71W can be attached only by changing the direction of the first bus bar member 73 in the circumferential direction. The second layer bus bars 72U, 72V, 72W can also be attached only by changing the direction of the second bus bar member 74 in the circumferential direction. Therefore, the work of attaching the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W can be performed efficiently.

According to the present embodiment, the bus bar holder 61 has a rotationally symmetric shape every 120 ° with the central axis J as the center. Accordingly, the positions of the U phase, the V phase, and the W phase are not determined in the state of the bus bar unit 60. Therefore, the bus bar unit 60 may be assembled to the stator 40 in any direction every 120 °. As a result, not only the manufacturing process of the bus bar unit 60 is simplified, but also an assembly error can be suppressed.

According to the present embodiment, the first layer bus bars 71U, 71V, 71W are held by the second clamping unit 66 between the lead wire connecting units 73d, 73e. In addition, the second layer bus bars 72U, 72V, 72W are held by the first holding portion 65 between the lead wire connecting portions 74d, 74e. Thereby, the mounting position accuracy of the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W can be improved. In particular, since the lead wire connecting portions 73d, 73e, 74d, and 74e are located on both sides of the second holding portion 66 and the first holding portion 65, the positional accuracy of the lead wire connecting portions 73d, 73e, 74d, and 74e is effectively increased. Can be increased. Further, even when vibration is applied to the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W, a load is applied to the lead wire connection portions 73d, 73e, 74d, 74e. Can be suppressed.

According to the present embodiment, the motor 10 has the bus bar unit 60 as described above. As a result, in the motor 10, 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.

FIG. 10 is a perspective view illustrating an external connection terminal of the bus bar according to the embodiment. FIG. 11 is a plan view illustrating external connection terminals of the bus bar according to the embodiment.
As shown in FIGS. 10 and 11, each terminal member 81 includes a first plate portion 80P and a second plate portion 80Q. The first plate portion 80P and the second plate portion 80Q are connected to each other at a bending line L extending in the axial direction.

1st board part 80P consists of the 1st terminal extending | stretching part 82 extended in an axial direction. The first terminal extending portion 82 is a plate-like member and extends upward in the vertical direction. The first terminal extending portion 82 has protrusions 88A and 88B in the middle in the vertical direction. The protrusions 88A and 88B protrude on both sides in the width direction. That is, the first plate portion 80P has a pair of protrusions 88A and 88B that protrude on both sides in the width direction.

The projecting portion 88A is located on the one surface 80d side of the second plate portion 80Q. The protrusion 88B protrudes to the other surface 80e side of the second plate portion 80Q. The first terminal extending portion 82 extends from one surface 80d of the second plate portion 80Q to the other surface 80e. Accordingly, the first plate portion 80P extends from the one surface 80d side of the second plate portion 80Q to the other surface 80e side when viewed from the axial direction.

The second plate part 80Q is located on the base end side on the lower side in the vertical direction of the first plate part 80P. The second plate portion 80Q faces in a different direction from the first plate portion 80P. The second plate portion 80Q is orthogonal to the first plate portion 80P. The second plate portion 80Q includes a second terminal extending portion 83, a third terminal extending portion 84, and a connecting portion 85.

One end 83 a in the width direction of the second terminal extending portion 83 is connected to one end in the width direction at the lower portion of the first terminal extending portion 82. The second terminal extending portion 83 extends orthogonally to the first terminal extending portion 82. The other end portion 83 b in the width direction of the second terminal extending portion 83 is positioned away from the other surface 81 b side of the first terminal extending portion 82. The upper end 83c of the second terminal extending portion 83 is positioned with a space in the vertical direction between the protruding portion 88B.

An end portion 84a on one side in the width direction of the third terminal extending portion 84 extends continuously downward from the second terminal extending portion 83 in the vertical direction. The third terminal extending portion 84 is orthogonal to the first terminal extending portion 82. An end portion 84 b on the other side in the width direction of the third terminal extending portion 84 extends toward the one surface 81 a of the first terminal extending portion 82. The other end portion 84 b in the width direction of the third terminal extending portion 84 is positioned away from the one surface 81 a side of the first terminal extending portion 82. The end 84c on the upper side in the up-down direction of the third terminal extending portion 84 is located with a space in the up-down direction between the protrusion 88A.
Thereby, the second plate portion 80Q extends from the one surface 81a side of the first plate portion 80P to the other surface 81b side when viewed from the axial direction.

Connection unit 85 includes a first connection unit 85A and a second connection unit 85B.
The first connection portion 85 </ b> A is located on the other side in the width direction of the third terminal extending portion 84. That is, the first connection portion 85A is located on the one surface 81a side of the first plate portion 80P when viewed from the axial direction. 85 A of 1st connection parts are the 1st convex parts 86 which protrude in the up-down direction lower side from the edge part 84f of the up-down direction lower side of the 3rd terminal extending | stretching part 84. As shown in FIG.

The second connection portion 85 </ b> B is located on one side in the width direction of the third terminal extending portion 84. That is, the second connecting portion 85B is located on the other surface 81b side of the first plate portion 80P when viewed from the axial direction. The second connection portion 85 </ b> B is a second convex portion 87 that protrudes downward in the vertical direction from an end portion 84 f on the lower side in the vertical direction of the third terminal extending portion 84.
The first connecting portion 85A of the connecting portion 85 extends longer in the vertical direction than the second connecting portion 85B.

FIG. 12 is a diagram illustrating a terminal piece used when manufacturing an external connection terminal according to an embodiment.
As shown in FIG. 12, the terminal member 81 is a terminal piece having an outer shape corresponding to a first terminal extending portion 82, a second terminal extending portion 83, a third terminal extending portion 84, and a connecting portion 85. 90 is formed by folding along a folding line L. That is, to manufacture the terminal member 81, first, the terminal piece 90 is punched from the metal plate by punching. Here, the terminal piece 90 has a slit 91 between the first terminal extending portion 82 and the protruding portion 88 </ b> B and the second terminal extending portion 83. The terminal piece 90 has a slit 92 between the lower end portion of the first terminal extending portion 82 and the third terminal extending portion 84.

Next, the terminal member 81 is obtained by bending the terminal piece 90 by a folding line L by 90 degrees. As described above, the terminal member 81 is formed by performing the punching process for forming the terminal piece 90 and the bending process for bending the terminal piece 90.

As shown in FIG. 5, the terminal member 81 is held by the terminal holding portion 69 of the bus bar holder 61. The terminal holding portion 69 holds the pair of protrusions 88A and 88B of the first plate portion 80P. The terminal member 81 is sandwiched between the pair of columnar members 69a and 69b in a state where the first plate portion 80P (first terminal extending portion 82) is aligned in the radial direction. The terminal member 81 inserts the protrusions 88A and 88B into the holding grooves 69m and 69n of the columnar members 69a and 69b from the upper side in the vertical direction to the lower side. The terminal member 81 is positioned in the circumferential direction and the radial direction by inserting the protrusions 88A and 88B into the holding grooves 69m and 69n. Furthermore, the protrusions 88A and 88B are positioned in the vertical direction by abutting against the lower ends of the holding grooves 69m and 69n. Furthermore, since the 1st terminal extending | stretching part 82 follows the wall part 69w provided in one columnar member 69a, it is suppressed that it falls in the circumferential direction.
In the terminal member 81 held by the terminal holding portion 69 in this way, the first terminal extending portion 82 protrudes upward from the terminal holding portion 69 in the vertical direction.

85 A of 1st connection parts of the terminal member 81 hold | maintained at the terminal holding | maintenance part 69 are inserted in the terminal insertion hole 73h of U phase 1st layer bus bar 71U, V phase 1st layer bus bar 71V, W phase 1st layer bus bar 71W. The The second connection portion 85B of the terminal member 81 is inserted into the terminal insertion hole 74h of the U-phase second-layer bus bar 72U, the V-phase second-layer bus bar 72V, and the W-phase second-layer bus bar 72W. Thereafter, the first connection portion 85A and the second connection portion 85B of the terminal member 81 are formed of the U-phase first layer bus bar 71U, the V-phase first layer bus bar 71V, the W-phase first layer bus bar 71W, and the U-phase second layer bus bar 72U. , V phase second layer bus bar 72V and W phase second layer bus bar 72W.

Thus, the U-phase external connection terminal 80U, the V-phase external connection terminal 80V, and the W-phase external connection terminal 80W made of the terminal member 81 are held by the terminal holding portion 69 of the bus bar holder 61. U-phase external connection terminal 80U extends upward (one side in the axial direction) from U-phase first layer bus bar 71U and U-phase second layer bus bar 72U. V-phase external connection terminal 80V extends upward (on the one side in the axial direction) from V-phase first layer bus bar 71V and V-phase second layer bus bar 72V. W-phase external connection terminal 80W extends upward (one side in the axial direction) from W-phase first layer bus bar 71W and W-phase second layer bus bar 72W.

According to the present embodiment, the external connection terminals 80U, 80V, 80W include the first plate portion 80P and the second plate portion 80Q. The external connection terminals 80U, 80V, and 80W can be manufactured by bending the flat terminal piece 90 along the bending line L. Therefore, the external connection terminals 80U, 80V, 80W can be manufactured with a high yield by taking a large number of terminal pieces 90 from a metal plate. In addition, external connection terminals 80U, 80V, and 80W having a first plate portion 80P that is a portion to be inserted into a socket of an external device and a second plate portion 80Q that are connected to each other at a folding line L with the first plate portion 80P. It becomes possible to manufacture efficiently. Therefore, the external connection terminals 80U, 80V, 80W having a three-dimensional shape can be easily manufactured while ensuring a high yield of the external connection terminals 80U, 80V, 80W.

According to the present embodiment, the first plate portion 80P extends from one surface side of the second plate portion 80Q to the other surface side when viewed from the axial direction. Thereby, the 1st board part 80P can be made wide, ensuring the high yield of the external connection terminals 80U, 80V, and 80W.

According to the present embodiment, the first connection portion 85A connected to the first layer bus bars 71U, 71V, 71W is located on one surface side of the first plate portion 80P and is connected to the second layer bus bars 72U, 72V, 72W. The second connection portion 85B to be connected is located on the other surface side of the first plate portion 80P.
Thereby, even when the external connection terminals 80U, 80V, and 80W have a plurality of first connection portions 85A and second connection portions 85B, a high yield of the external connection terminals 80U, 80V, and 80W can be ensured. Moreover, the workability | operativity of a connection process can be improved by fully separating | separating the distance of 85 A of 1st connection parts, and the 2nd connection part 85B.

According to the present embodiment, the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W are different from each other in axial position. Further, the first connection portion 85A is inserted into the terminal insertion hole 73h provided in the first layer bus bars 71U, 71V, 71W. The second connection portion 85B is inserted into a terminal insertion hole 74h provided in the second layer bus bars 72U, 72V, 72W. That is, the axial position of the connection position of the external connection terminals 80U, 80V, 80W and the first layer bus bar 71, the axial position of the connection position of the external connection terminals 80U, 80V, 80W and the second layer bus bar 72, Are different from each other.
In this way, the first connection portion 85A and the second connection portion 85B protruding downward are inserted into the terminal insertion holes 73h and 74h. Compared to the case where the first connection portion 85A and the second connection portion 85B are abutted against and joined to the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W, the first connection portion 85A, The dimensional accuracy of the two connecting portions 85B can be suppressed.

According to the present embodiment, the motor 10 has the bus bar unit 60 as described above. Accordingly, it is possible to easily manufacture the external connection terminals 80U, 80V, 80W having a three-dimensional shape while ensuring a high yield of the external connection terminals 80U, 80V, 80W.

FIG. 13 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 device 2 shown in FIG. 13 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, the first layer bus bars 71U, 71V, 71W and the second layer bus bars 72U, 72V, 72W are linearly extended, but may be extended while being curved.

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, 43 ... Coil (coil wire), 45 ... 2nd lead wire (leader), 60 ... Bus bar unit, 61 ... Bus bar holder, 65 ... 1st clamping part (clamping part) ), 66 ... the second clamping part (clamping part), 70 ... the bus bar, 70 U ... the U-phase bus bar group, 70 V ... the V-phase bus bar group, 70 W ... the W-phase bus bar group, 71 ... the first layer bus bar (first Bus bar), 71U ... U phase first layer bus bar, 71V ... V phase first layer bus bar, 71W ... W phase first layer bus bar, 72 ... Second layer bus bar (second bus bar), 72U ... U phase second layer bus bar 72V ... V-phase second layer bus bar, 72W ... W-phase second layer bus bar, 73 ... first bus bar member, 73a ... first bus bar extension part (first extension part), 73d, 73e ... leader connection part, 73h ... Terminal insertion hole (first through hole , 74 ... second bus bar member, 74a ... fourth bus bar extension part (second extension part), 74d, 74e ... lead wire connection part, 74h ... terminal insertion hole (second through hole), 80P ... first plate part, 80Q ... second plate part, 80U ... U phase external connection terminal (external connection terminal), 80V ... V phase external connection terminal (external connection terminal), 80W ... W phase external connection terminal (external connection terminal), 85 ... connection part , 85A ... first connection part, 85B ... second connection part, 86 ... first convex part, 87 ... second convex part, J ... central axis, L ... folding line

Claims (13)

1. 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 U-phase bus bar group, a V-phase bus bar group, and a W-phase bus bar group fixed to the bus bar holder;
   The U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group,
   A first layer bus bar located on one side in the axial direction of the bus bar holder and extending along a plane perpendicular to the axial direction;
   A second layer bus bar located on one axial side of the first layer bus bar and extending along a plane orthogonal to the axial direction;
   An external connection terminal connected to the first layer bus bar and the second layer bus bar and extending from the first layer bus bar and the second layer bus bar to one side in the axial direction;
   The first layer bus bar and the second layer bus bar are connected to a lead line extending from the stator,
   In the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group, the first layer bus bar and the second layer bus bar are opposite to each other in the circumferential direction from the connected external connection terminal. A bus bar unit that extends to the side.
2. In the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group,
   The first layer bus bar has a first extending portion extending in a direction orthogonal to the radial direction,
   The second layer bus bar has a second extending portion extending in a direction orthogonal to the radial direction,
   The bus bar unit according to claim 1, wherein the first extending portion and the second extending portion are located on opposite sides of the central axis.
3. The bus bar unit according to claim 2, wherein the first extending portion and the second extending portion extend in parallel with each other.
4. Seen from the axial direction,
   The first layer bus bar of the U-phase bus bar group passes below the second layer bus bar of the V-phase bus bar group and the W-phase bus bar group,
   The first layer bus bar of the V-phase bus bar group passes below the second layer bus bar of the U-phase bus bar group and the W-phase bus bar group,
   4. The first-layer bus bar of the W-phase bus bar group passes under the second-layer bus bar of the U-phase bus bar group and the V-phase bus bar group. Busbar unit as described in.
5. The bus bar unit according to any one of claims 1 to 4, wherein the first layer bus bar and the second layer bus bar are plate-shaped, and are arranged with the axial direction being a plate thickness direction.
6. The axial positions of the first-layer bus bars of the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group match,
   6. The bus bar according to claim 1, wherein the second-layer bus bars of the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group coincide with each other in the axial direction. unit.
7. The first-layer bus bars of the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group have the same shape,
   The bus bar unit according to any one of claims 1 to 6, wherein the second layer bus bars of the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group have the same shape.
8. The bus bar unit according to claim 7, wherein the U-phase bus bar group, the V-phase bus bar group, and the W-phase bus bar group are arranged in rotational symmetry every 120 ° about the central axis.
9. The bus bar unit according to claim 8, wherein the bus bar holder has a rotationally symmetric shape every 120 ° about the central axis.
10. The bus bar holder has a plurality of clamping portions that sandwich the first layer bus bar and the second layer bus bar,
    At least one of the first layer bus bar and the second layer bus bar has a plurality of lead wire connection parts connected to the lead lines, and is held by the clamping part between the lead line connection parts. The bus bar unit according to any one of claims 1 to 9.
11. 11. The bus bar unit according to claim 10, wherein an axial position of a tip of the sandwiching part that sandwiches the first layer bus bar and an axial position of the tip of the sandwiching part that sandwiches the second layer bus bar are different from each other.
12. The axial position of the connection position between the external connection terminal and the first layer bus bar is different from the axial position of the connection position between the external connection terminal and the second layer bus bar. The bus bar unit according to any one of the above.
13. A motor having the bus bar unit according to any one of claims 1 to 12,
    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.

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