CN112583171A

CN112583171A - Stator and motor

Info

Publication number: CN112583171A
Application number: CN202011024757.6A
Authority: CN
Inventors: 山口雄平; 青野真乡
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-09-30
Filing date: 2020-09-25
Publication date: 2021-03-30
Also published as: DE102020125423A1; JP2021057999A

Abstract

The present invention provides a stator and a motor, wherein the stator comprises: a stator core having a ring shape with a central axis line extending in the vertical direction as a center; a coil wound around the teeth of the stator core; a plate-shaped bus bar to which a coil wire drawn out from the coil is connected; and a bus bar holder that supports the bus bar. The bus bar has a main body portion whose thickness direction is a direction perpendicular to the axial direction, and a coil wire connecting portion connected to the main body portion. The body has a hook surface facing upward. The bus bar holder has a 1 st claw portion hooked on the hook surface.

Description

Stator and motor

Technical Field

The invention relates to a stator and a motor.

Background

Conventionally, the following motors are known: has a bus bar connected to a coil wire of a motor and a bus bar holder holding the bus bar. In such a motor, a holding structure that combines both the assembling property and stability of the bus bar with respect to the bus bar holder has been studied. For example, patent document 1 describes the following structure: a protruding piece is provided on the base end of the terminal metal to which the lead wire is connected, and the terminal metal is held on the terminal block by the protruding piece.

Patent document 1: japanese patent laid-open publication No. 2013-211126

In the conventional configuration, the assemblability and stability of the bus bar with respect to the bus bar holder are not sufficient.

Disclosure of Invention

In view of the above problems, it is an object of one embodiment of the present invention to provide a stator and a motor having a bus bar holder that can be easily assembled and can stably hold a bus bar.

One embodiment of the present invention is a stator including: a stator core having a ring shape with a central axis line extending in the vertical direction as a center; a coil wound around a tooth of the stator core; a plate-shaped bus bar connected to a coil wire drawn out from the coil; and a bus bar holder that supports the bus bar. The bus bar has: a main body portion having a direction perpendicular to an axial direction as a plate thickness direction; and a coil wire connecting portion connected to the main body portion. The body portion has a hook surface facing upward. The busbar holder has a 1 st claw portion hooked on the hooking surface.

According to one embodiment of the present invention, a stator and a motor having a bus bar holder that can be easily assembled and can stably hold a bus bar are provided.

Drawings

Fig. 1 is a sectional view of a motor unit of an embodiment.

Fig. 2 is a perspective view of a stator according to an embodiment.

FIG. 3 is a front view of one embodiment of a bus bar.

Fig. 4 is a partially enlarged view of fig. 2 showing the bus bar and the bus bar support portion.

Fig. 5 is a sectional view of a bus bar and a bus bar support portion of an embodiment.

Fig. 6 is a sectional view of a bus bar and a bus bar support portion of a modification.

Fig. 7 is a partially enlarged view of fig. 2 showing the leg portion and the 2 nd claw portion.

Description of the reference symbols

1: a motor unit; 15: an insulating member; 17 g: a groove part; 20: a motor; 21: a stator; 22: a stator core; 23 b: a tooth portion; 24: a coil; 24 a: a coil wire; 25: a rotor; 81: a bus bar; 82: a main body portion; 82 a: a through hole; 82 b: hooking the fine dried noodles; 82 c: a convex portion; 83: a coil wire connecting portion; 90: a bus bar holder; 95: a 1 st claw part; 96a, 96 b: a wall surface; 96 h: a bottom surface; 96 k: a hole portion; 97: a winding section; 97 a: anti-drop bulges; 98: a leg portion; 99: a 2 nd claw portion; 99 p: a notch portion; 182 a: a concave portion; 196k, and (2): a recess; d1, D2: an edge dimension; j: a central axis; t1: one side in the circumferential direction; t2: the other side in the circumferential direction; w1, W2: the width dimension.

Detailed Description

Fig. 1 is a sectional view of a motor unit 1 of the present embodiment. The motor unit 1 includes a motor 20, a motor case (housing) 30, a gear case (lower cover) 40, a holding member 10, a control unit 50, and an upper cover 60.

In the following description, a direction parallel to the central axis J is simply referred to as an "axial direction" or a "vertical direction", a radial direction about the central axis J is simply referred to as a "radial direction", and a circumferential direction about the central axis J, that is, a direction around the central axis J is simply referred to as a "circumferential direction". In the following description, the "plan view" refers to a state viewed from the axial direction. In the present specification, the upper side of fig. 1 in the axial direction along the center axis J is simply referred to as the "upper side", and the lower side is simply referred to as the "lower side". The vertical direction does not indicate the posture of the motor case 30 and the positional relationship and direction of each part when the motor case is incorporated into an actual device.

The motor case 30 houses the motor 20. In the present specification, "storage" is a concept as follows: the present invention includes not only a case where the entire object enters the inside, but also a case where at least a part of the object is surrounded by the object.

The motor case 30 has a motor holding portion 32, a bearing holder 33, and a collar 34. The motor holding portion 32 is made of resin. The motor holding portion 32 is insert-molded by embedding the stator 21, the bearing holder 33, and the collar 34.

The bearing holder 33 is made of metal. The bearing holder 33 holds the upper bearing 29A. In addition, the collar 34 is made of metal and has a cylindrical shape extending in the axial direction. The collar 34 is embedded in the motor holding portion 32. The collar 34 is exposed on the upper and lower surfaces of the motor holding portion 32.

The gear box 40 is disposed at a lower side of the motor housing 30. The holding member 10 is axially sandwiched between the motor case 30 and the gear case 40, and the gear case 40 surrounds the gear, not shown, from the outside in the radial direction. In addition, the holding member 10 supports the lower bearing 29B.

The control section 50 is located above the motor 20. The control unit 50 controls the rotation of the motor 20. The control unit 50 includes a control board 51 and a plurality of electronic components.

The upper cover 60 is axially opposed to the motor case 30. The upper cover 60 covers the upper side of the motor case 30. The control unit 50 is housed in a space surrounded by the upper cover 60 and the motor case 30.

The upper cover 60 is fixed to the motor case 30 by bolts 70. The shaft portion 71 of the bolt 70 is fastened to the screw hole of the gear case 40 through the through-insertion hole provided in the upper cover 60 and the through-insertion holes provided in the collar 34 and the holding member 10.

The motor 20 has a rotor 25 and a stator 21. The rotor 25 rotates about a central axis J extending in the axial direction. The rotor 25 is radially opposed to the stator 21. The rotor 25 has a shaft 26, a rotor core 27, and a plurality of magnets 28.

The shaft 26 is disposed along the center axis J. The shaft 26 has a cylindrical shape extending in the axial direction. The shaft 26 is supported by an upper bearing (bearing) 29A and a lower bearing 29B so as to be rotatable about the center axis J. The rotor core 27 has a columnar shape extending in the axial direction. The rotor core 27 is fixed to the shaft 26.

A plurality of magnets 28 are fixed to the rotor core 27. The magnet 28 may be fixed inside the rotor core 27 or may be fixed on the outer peripheral surface. The plurality of magnets 28 are arranged in the circumferential direction. The magnetic poles of the magnets 28 adjacent to each other in the circumferential direction in the radial direction are reversed. The plurality of magnets 28 are arranged at equal intervals along the entire circumference in the circumferential direction.

The stator 21 is located radially outside the rotor 25. The stator 21 has a stator core 22, an insulator 15, a coil 24, and a bus bar unit 80.

The stator core 22 is annular with the center axis J as the center. Stator core 22 has a cylindrical core back portion 23a and a plurality of tooth portions 23b extending radially inward from core back portion 23 a.

The plurality of teeth 23b are provided at equal intervals in the circumferential direction around the center axis J. The coil 24 is wound around the tooth portion 23b via an insulating insulator 15. The coil 24 is constituted by a coil wire 24 a. The coil wire 24a is drawn out from the stator 21 and connected to a bus bar 81 described later.

The insulator 15 is interposed between the tooth portion 23b and the coil 24. The insulator 15 has an inner wall portion 16 and an outer wall portion 17 located on the upper side and the lower side of the stator core, respectively. The inner wall portion 16 extends in the circumferential direction along the tip of the tooth portion 23 b. Likewise, the outer wall portion 17 extends in the circumferential direction along the base end of the tooth portion 23 b.

Fig. 2 is a perspective view of the stator 21.

The bus bar unit 80 is located at an upper side of the stator core 22. The bus bar unit 80 includes a bus bar 81 described later and a bus bar holder 90 that supports the bus bar 81. In the present embodiment, the bus bar unit 80 has three bus bars 81 and a bus bar holder 90. In the present embodiment, the three bus bars 81 are arranged at intervals of 120 degrees in the circumferential direction, but the present invention is not limited thereto. The arrangement of the bus bars may be changed as appropriate.

The bus bar 81 is a so-called phase bus bar. The bus bar 81 is made of a metal material having high conductivity such as a copper alloy. The bus bar 81 is plate-shaped and is formed by pressing a plate material. The bus bar 81 is connected to the coil wire 24a drawn out from the coil 24. In the present embodiment, three bus bars 81 are connected to the U-phase coil, the V-phase coil, and the W-phase coil, respectively. Further, the bus bar 81 is connected to the control unit 50. The bus bar 81 connects the control unit 50 and the coil 24, and transmits an alternating current supplied from the control unit 50 to the coil 24.

The bus bar 81 has a main body portion 82, a coil wire connecting portion 83, and a press-fit terminal 84. The coil wire connecting portion 83 and the press-fit terminal 84 are connected to the main body portion 82, respectively. In the present embodiment, the bus bar 81 has a main body portion 82, a pair of coil wire connection portions 83, and three press-fit terminals 84. A pair of coil wire connecting portions 83 and three press-fit terminals 84 are connected to the main body portion 82, respectively.

The pair of coil wire connecting portions 83 extend from the main body portion 82 to both sides in the circumferential direction. The coil wire connecting portion 83 is formed in a direction perpendicular to the axial direction as a plate thickness direction. A U-shaped grip portion 83a bent so as to be folded back in the circumferential direction is provided at the tip of the coil wire connecting portion 83. The grip portion 83a is a portion that grips the coil wire 24a extending from the coil 24 and is joined by a joining means such as welding. That is, the coil wire connecting portion 83 is connected to the coil wire 24a at the grip portion 83 a.

The press-fit terminals 84 extend from the body portion 82 toward the upper side. The press-fit terminals 84 are inserted into through-holes (not shown) provided on the control substrate 51. The front end portion 84a of the press-fit terminal 84 is slightly wider than the aperture of the through hole when viewed in the axial direction. Further, a copper plating connected to the circuit pattern is provided on the inner peripheral surface of the through hole. The front end portion 84a of the press-fit terminal 84 is pressed into the through hole. Thereby, a mechanical contact load is generated between the press-fit terminal 84 and the inner peripheral surface of the through hole, and the terminals are electrically connected to each other.

The body 82 is disposed with a radial direction with respect to the central axis J as a plate thickness direction. However, the main body 82 may be arranged with the circumferential direction as the plate thickness direction, for example. That is, the main body 82 may be disposed with the direction perpendicular to the axial direction as the plate thickness direction.

Fig. 3 is a front view of the bus bar 81 as viewed from the plate thickness direction of the main body 82.

The main body 82 is provided with a through hole 82a penetrating in the plate thickness direction. In the present embodiment, the through-hole 82a has a rectangular shape when viewed from the thickness direction of the main body 82. The main body portion 82 has a hooking surface 82b, and the busbar holder 90 has a 1 st claw portion 95 hooked on the hooking surface 82 b. As a result, as will be described later, the upper surface of the inner surface of the through hole 82a functions as a hook surface 82b to which the 1 st claw portion 95 of the bus bar holder 90 is hooked. In the present embodiment, the hooking surface 82b is an inner surface of the through hole 82 a.

The body 82 has a projection 82c projecting downward. That is, a convex portion 82c is provided at the lower end portion of the bus bar 81. The convex portion 82c has a substantially rectangular shape when viewed from the plate thickness direction.

In the present embodiment, the edge dimensions D1, D2 from the inner edge of the through hole 82a to the outer edge of the body portion 82 are larger than the width dimensions W1, W2 of the coil wire connection portion 83. Here, the width dimensions W1, W2 of the coil wire connection part 83 are dimensions of the coil wire connection part 83 in a direction perpendicular to a direction in which the coil wire connection part 83 extends with respect to the main body part 82. The width dimensions W1, W2 of the coil wire connection part 83 in the present embodiment are dimensions along the axial direction of the coil wire connection part 83. The current flows from the press-fit terminal 84 side to the coil wire connecting portion 83 via the body portion. According to the present embodiment, a cross-sectional area perpendicular to the conductive path of the bus bar 81 can be sufficiently secured in the main body portion 82, and an increase in the resistance value in the main body portion 82 can be suppressed.

In the present embodiment, the sum of the edge dimensions D1 and D2 is larger than the sum of the width dimensions W1 and W2. In this configuration, since a sufficient cross-sectional area perpendicular to the conductive path of the bus bar 81 can be secured in the main body 82, an increase in the resistance value in the main body 82 can be suppressed.

Even when the number of the coil connecting portions of the bus bar is 1, the edge dimensions D1 and D2 from the inner edge of the through hole to the outer edge of the main body portion are preferably larger than the width dimension of the coil wire connecting portion. Further, the sum of the edge dimensions D1 and D2 is preferably larger than the width dimension.

As shown in fig. 2, the bus bar holder 90 is disposed above the stator core 22. The bus bar holder 90 is annular with the center axis J as the center. The bus bar holder 90 is made of a resin material. The bus bar holder 90 supports the plurality of bus bars 81 arranged in the circumferential direction from the lower side.

The bus bar holder 90 includes an inner annular portion 91, an outer annular portion 92, and a bridge portion 93. The inner annular portion 91 and the outer annular portion 92 are annular with the center axis J as the center, and are arranged concentrically with each other. The inner annular portion 91 is located radially inward of the outer annular portion 92. The inner annular portion 91 is positioned directly above the inner wall portion 16 of the insulator 15, and the outer annular portion 92 is positioned directly above the outer wall portion 17. The bridge 93 extends in a radial direction. The bridge portion 93 is connected to the inner annular portion 91 at a radially inner end portion and connected to the outer annular portion 92 at a radially outer end portion.

The inner annular portion 91 has a plurality of (three in the present embodiment) bus bar support portions 94 and a plurality of (six in the present embodiment) winding portions 97. The winding portions 97 are disposed on both circumferential sides of the one busbar supporting portion 94.

Fig. 4 is a partially enlarged view of fig. 2 showing the bus bar 81 and the bus bar support 94.

The bus bar support portion 94 supports the bus bar 81. The bus bar support portion 94 has a pair of

wall portions

96A, 96B and a 1 st claw portion 95. The pair of

wall portions

96A, 96B extend in parallel in a direction perpendicular to the radial direction of the central axis J. The center of one wall portion 96A located radially inward of the pair of

wall portions

96A, 96B is interrupted, and the 1 st claw portion 95 is disposed in the interrupted portion.

The pair of

wall portions

96A, 96B have

wall surfaces

96A, 96B facing each other, respectively. A groove 96g slightly larger than the plate thickness of the bus bar 81 is provided between the pair of

wall surfaces

96a, 96 b. The bus bar 81 is received in the groove 96 g.

According to the present embodiment, the bus bar holder 90 has a pair of

wall surfaces

96a, 96b that sandwich the body portion 82 of the bus bar 81. This can suppress the bus bar 81 from moving or falling in the plate thickness direction.

As shown in fig. 3, the groove 96g has a bottom surface 96h that supports the lower end portion of the bus bar 81 from the lower side. A hole 96k penetrating in the axial direction is opened in the bottom surface 96 h. The convex portion 82 of the bus bar 81 is inserted into the hole portion 96 k.

According to the present embodiment, the bus bar holder 90 has a bottom surface 96h that supports the lower end portion of the bus bar 81 from below. Therefore, stress when the press-fit terminal 84 is pressed into the through hole of the control substrate 51 can be received from below by the bus bar holder 90.

Further, according to the present embodiment, by inserting the convex portion 82c of the bus bar 81 into the hole portion 96k provided in the bottom surface 96h, the bus bar 81 can be restricted from moving in the direction in which the recessed groove 96g extends inside the recessed groove 96 g. This can improve the stability of the bus bar 81 support by the bus bar support 94.

As shown by the imaginary line (two-dot chain line) in fig. 3, a recess 196k that does not penetrate in the axial direction may be provided in the bottom surface 96h of the concave groove 96g instead of the hole 96 k. Even in this case, by inserting the convex portion 82c of the bus bar 81 into the concave portion 196k, the bus bar 81 can be stabilized in the concave groove 96 g.

Fig. 5 is a sectional view of the bus bar 81 and the bus bar support 94.

The 1 st claw portion 95 extends upward from the upper surface of the inner annular portion 91. The 1 st claw portion 95 is located radially inward of the bus bar 81. A projection 95a projecting radially outward is provided at the tip of the 1 st claw 95. The projection 95a has an inclined surface 95b at the upper end and a lower end surface 95c at the lower end. The inclined surface 95b is inclined radially outward as it goes downward. The lower end surface 95c is a flat surface extending along a plane perpendicular to the central axis J.

The projection 95a of the 1 st pawl 95 is inserted into the through hole 82a of the bus bar 81. The lower end surface 95c of the protrusion 95a vertically faces the hooking surface 82b facing upward on the inner surface of the through hole 82 a. That is, the 1 st claw portion 95 is hooked on the hooking surface 82b of the bus bar 81. Thereby, the 1 st claw portion 95 restricts the movement of the bus bar 81 to the upper side, and the bus bar 81 is suppressed from coming off from the bus bar support portion 94.

In addition, according to the present embodiment, the inclined surface 95b is provided at the upper end of the protrusion 95 a. Therefore, by inserting the bus bar 81 into the concave groove 96g of the bus bar support portion 94, the bus bar 81 comes into contact with the inclined surface 95b, and the 1 st claw portion 95 can be deflected radially inward. Further, by inserting the bus bar 81 to a predetermined position, the protrusion 95a can be smoothly disposed inside the through hole 82 a. That is, according to the present embodiment, the process of supporting the bus bar 81 on the bus bar holder 90 can be easily performed.

The projection 95a of the 1 st claw 95 overlaps the hole 96k when viewed in the axial direction. Thereby, the lower end surface 95c of the protrusion 95a faces downward through the hole 96 k. Therefore, the protrusion 95a does not become an undercut, and the mold structure for molding the bus bar holder 90 can be simplified.

In the present embodiment, a case where the through hole 82a is provided in the body portion 82 of the bus bar 81 and the 1 st claw portion 95 is hooked on the inner surface of the through hole 82a, that is, a case where the inner surface of the through hole 82a is the hooking surface 82b, is described. However, the structure of the hook surface 82b is not limited to this embodiment. As shown in a modification of fig. 6, the body 82 may be provided with a concave portion 182a that is concave toward one side in the plate thickness direction, and the hook surface 82b may be an inner surface of the concave portion 182 a. As another modification, the upper end portion of the body 82 may be a hook surface.

The structure of the winding portion 97 will be described with reference to fig. 4.

In fig. 4, a circumferential side T1 and a circumferential side T2 in the following description are illustrated as arrows. The circumferential one side T1 and the circumferential other side T2 are directions opposite to each other in the circumferential direction around the central axis J.

Here, the configuration of the pair of coil wire connecting portions 83 provided on the bus bar 81 will be described with attention paid to one of the coil wire connecting portions which is positioned on the other circumferential side T2. The coil wire connecting portion 83 located on the circumferential direction side T1 has a bilaterally symmetrical structure.

The winding portion 97 protrudes upward from the upper surface of the inner annular portion 91. The winding portion 97 is disposed in a path of the coil wire 24a extending from the coil 24 and connected to the coil wire connecting portion 83 of the bus bar 81, and is wound around the coil wire 24 a. The winding portion 97 is located on the other circumferential side T2 of the coil 24 and the coil wire connecting portion 83.

The coil wire 24a is led from the coil 24 to the other circumferential side T2, and is wound around the winding portion 97 to be folded back. The coil wire 24a is wound from the winding portion 97 to the coil wire connection portion 83 on the circumferential side T1. The coil wire connecting portion 83 is open to one circumferential side T1 in the U-shaped grip portion 83 a. The coil wire 24a drawn out from the winding portion 97 is guided to the coil wire connecting portion 83 opened at one circumferential side T1.

According to the present embodiment, the bus bar holder 90 includes the winding portion 97 that is located on the other circumferential side of the coil wire connecting portion 83 and protrudes upward, and the coil wire connecting portion 83 is folded back in a curved fashion by the winding portion 97. This allows the coil wire 24a to be guided from the opposite side of the opening direction with respect to the coil wire connecting portion 83, and allows the joining step of welding the coil wire 24a to the coil wire connecting portion 83 or the like to be performed in a state of being hooked on the grip portion 83a of the coil wire connecting portion 83. This can prevent the coil wire 24a from coming off the coil wire connecting portion 83 during the joining process, and can simplify the joining process.

The winding portion 97 has a retaining projection 97a projecting to the other side in the circumferential direction. The coil wire 24a is wound around the winding portion 97 below the retaining projection 97 a. In other words, the winding portion 97 has a retaining projection 97a projecting to the other side in the circumferential direction on the upper side of the wound coil wire 24 a. This can prevent the coil wire 24a from being displaced upward and coming off the winding portion 97.

As shown in fig. 2, the outer annular portion 92 is provided with a plurality of (three in the present embodiment) leg portions 98 and a plurality of (three in the present embodiment) 2 nd claw portions 99. The leg portion 98 and the 2 nd claw portion 99 extend downward from the lower surface of the outer annular portion 92.

Fig. 7 is a partially enlarged view of fig. 2 showing the leg portion 98 and the 2 nd claw portion 99.

As shown in fig. 2, the lower end surface of the outer wall portion 17 of the insulator 15 is in contact with the upper surface of the stator core 22. A stepped portion 17b recessed upward is provided on the lower end surface of the outer wall 17. The step portion 17b has a hook surface 17c facing downward. The lower end surface of the outer wall 17 faces the upper surface of the stator core 22 at the hook surface 17c with a gap therebetween.

A projection 99a projecting radially inward is provided at the lower end of the 2 nd claw 99. The protrusion 99a has an inclined surface 99b at the lower end and an upper end surface 99c at the upper end. The inclined surface 99b is inclined radially inward as it goes upward. The upper end surface 99c is a flat surface extending along a plane perpendicular to the central axis J.

The protrusion 99a of the 2 nd claw portion 99 is inserted into the gap between the hook surface 17c of the insulator 15 and the upper surface of the stator core 22. The upper end surface 99c of the protrusion 99a vertically faces the hook surface 17 c. That is, the 2 nd pawl portion 99 is hooked on the hook surface 17c of the bus bar 81.

According to the present embodiment, the bus bar holder 90 has the 2 nd claw portion 99 extending downward and hooked on the insulator 15, thereby restricting the movement of the bus bar holder 90 upward with respect to the insulator 15, and suppressing the bus bar unit 80 from being detached from the stator 21.

In the present embodiment, the outer wall 17 is provided with notched portions 99p, and the notched portions 99p are located on both sides of the base end of the 2 nd claw portion 99 in the circumferential direction and are notched upward. According to the present embodiment, by providing the notch portion 99p in the bus bar holder 90, the 2 nd pawl portion 99 can be made long in the axial direction, and a sufficient amount of deflection can be secured.

According to the present embodiment, the inclined surface 99b is provided at the lower end of the protrusion 99 a. Therefore, in the assembly process, the outer wall portion 17 is in contact with the inclined surface 99b, and the 2 nd claw portion 99 can be bent radially outward, so that the protrusion portion 99a can be smoothly inserted into the gap between the hook surface 17c and the upper surface of the stator core 22. That is, according to the present embodiment, the bus bar unit 80 can be easily assembled to the stator 21.

A groove portion 17g extending in the axial direction with the same width is provided on the outer peripheral surface of the outer wall portion 17 facing the radial direction outer side. The groove 17g is open upward at the upper end of the outer wall 17. In addition, the groove portion 17g is connected to the step portion 17b at the lower end portion. The leg portion 98 of the bus bar holder 90 is inserted into the groove portion 17 g.

According to the present embodiment, the leg portion 98 of the bus bar holder 90 is inserted into the groove portion 17g provided on the insulator 15. This can suppress the bus bar holder 90 from rotating in the circumferential direction with respect to the insulator 15, and can improve the stability of holding the bus bar holder 90 by the insulator 15.

While the embodiment of the present invention and the modified examples thereof have been described above, the configurations of the embodiment and the modified examples, and combinations thereof, are examples, and additions, omissions, substitutions, and other modifications of the configurations can be made without departing from the spirit of the present invention. The present invention is not limited to the embodiments.

For example, in the above-described embodiment, the case where the bus bar 81 is a phase bus bar has been described, but the bus bar 81 may be a neutral point bus bar that constitutes a neutral point of a three-phase circuit.

In the present embodiment, the case where the body portion is a press-fit terminal has been described, but the shape of the terminal is not limited to this. The terminal may have a plate shape extending in the axial direction.

In the present embodiment, the case where the motor holding portion 32 is made of resin and the bearing holder 33 is embedded in the motor holding portion 32 by insert molding has been described, but the present invention is not limited thereto. The stator may be housed in a cup-shaped metal housing, and the metal bearing holder may cover an opening of the housing. In this case, the bearing holder has a through hole extending in the axial direction, and the terminal of the body portion extends from the inside to the outside of the motor through the through hole.

The present invention can be used for, for example, a power steering motor, an oil pump motor, a water pump motor, a compressor motor, and the like.

Claims

1. A stator, having:

a stator core having a ring shape with a central axis line extending in the vertical direction as a center;

a coil wound around a tooth of the stator core; and

a bus bar unit having a plate-shaped bus bar connected to a coil wire drawn out from the coil and a bus bar holder supporting the bus bar,

the bus bar has:

a main body portion having a direction perpendicular to an axial direction as a plate thickness direction; and

a coil wire connecting portion connected to the main body portion,

the main body part is provided with a hooking surface facing upwards,

the busbar holder has a 1 st claw portion hooked on the hooking surface.

2. The stator according to claim 1,

the main body portion is provided with a through hole penetrating in a plate thickness direction,

the hooking surface is an inner side surface of the through hole.

3. The stator according to claim 2,

an edge dimension from an inner edge of the through hole to an outer edge of the main body portion is larger than a width dimension of the coil wire connecting portion.

4. The stator according to claim 2,

the sum of the edge dimensions from the inner edge of the through hole to the outer edge of the main body portion is larger than the sum of the width dimensions of the coil wire connecting portions.

5. The stator according to claim 1,

the main body is provided with a concave portion depressed toward one side in the plate thickness direction,

the hooking surface is an inner side surface of the concave portion.

6. The stator according to any one of claims 1 to 5,

the bus bar holder has a pair of wall surfaces opposed to each other,

the bus bar is sandwiched between a pair of the wall surfaces.

7. The stator according to claim 6,

the bus bar holder has a bottom surface that supports a lower end portion of the bus bar from a lower side,

a hole part which penetrates along the axial direction is opened on the bottom surface,

a protruding portion inserted into the hole portion is provided at a lower end portion of the bus bar.

8. The stator according to claim 6,

a concave part is arranged on the bottom surface,

a convex portion inserted into the concave portion is provided at a lower end portion of the bus bar.

9. The stator according to any one of claims 1 to 8,

the coil wire connecting portion is open at one side in the circumferential direction,

the bus bar holder has a winding portion located on the other circumferential side of the coil wire connecting portion and protruding upward,

the coil wire is wound around the winding portion from the coil to the other side in the circumferential direction, and is guided to the opening of the coil wire connecting portion.

10. The stator according to claim 9,

the winding portion has a retaining projection projecting to the other side in the circumferential direction on the upper side of the wound coil wire.

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

the stator has an insulator interposed between the teeth and the coil,

the bus bar holder has a 2 nd claw portion extending downward and hooked to the insulator.

12. The stator according to claim 11,

the busbar holder is provided with notched portions that are located on both sides of the base end of the 2 nd pawl in the circumferential direction and that are notched to the upper side.

13. The stator according to claim 11 or 12,

the insulating member is provided with a groove portion extending in the axial direction,

the bus bar holder has a leg portion inserted into the groove portion.

14. The stator according to any one of claims 1 to 13,

the bus bar holder is annular with a central axis as a center, and supports the plurality of bus bars arranged in the circumferential direction.

15. A motor, comprising:

the stator of any one of claims 1 to 14; and

a rotor radially opposed to the stator.