CN116896209A - stator and motor - Google Patents

Abstract

The invention provides a stator and a motor. In one embodiment of the stator, the bus bar holder includes a holder body portion that holds the bus bar body portion, and a coil insertion hole that penetrates the bus bar body portion in an axial direction. The coil lead wire passes through the coil insertion hole and is electrically connected to the coil connection portion at one axial side of the holder body portion. The cap member has a cap main body portion extending in a circumferential direction, a plurality of cap extension portions extending in a radial direction from the cap main body portion, and a protrusion portion extending from the cap extension portions to the other side in an axial direction. The protrusion is inserted into the coil insertion hole. The coil connection portion and the coil outgoing line are covered with an adhesive on one axial side of the bus bar holder.

Description

Stator and motor

Technical Field

The present invention relates to a stator and a motor.

Background

A stator is known in which a connecting portion between a bus bar and a coil lead wire is covered with an insulating resin. The stator described in patent document 1 has the following structure: by covering the connection portion between the bus bar and the coil lead wire with an insulating resin, it is possible to prevent water and foreign matter from entering the coil while ensuring the insulation of the connection portion.

Patent document 1: japanese patent No. 4851966

The bus bar holder is provided with an insertion hole for extracting the coil lead wire upward. When the resin is injected, the resin may leak out to the coil side through the insertion hole.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a stator and a motor in which leakage of an adhesive insulating a connection portion of a coil lead wire to a coil side is suppressed.

One embodiment of the present invention is a stator including a stator core, a coil, a bus bar holder, and a cap member disposed on one axial side of the bus bar holder. The bus bar has: an annular bus bar main body portion; and a coil connection portion extending from the bus bar body portion and electrically connected to a coil lead wire, which is an end portion of a coil wire constituting the coil. The bus bar holder has: a holder body portion that holds the bus bar body portion; and a coil insertion hole that penetrates the bus bar main body portion in an axial direction. The coil lead wire passes through the coil insertion hole and is electrically connected to the coil connection portion at one axial side of the holder body portion. The cap member has: a cap body portion extending in a circumferential direction; a plurality of cap extensions extending radially from the cap body portion; and a protrusion extending from the cap extension toward the other axial side. The protrusion is inserted into the coil insertion hole. The coil connection portion and the coil outgoing line are covered with an adhesive on one axial side of the bus bar holder.

One embodiment of the present invention is a motor including: the stator described above; and a rotor that is rotatably supported so as to be radially opposed to the stator.

According to one aspect of the present invention, in the stator of the motor, leakage of the adhesive insulating the connection portion of the coil lead wire to the coil side is suppressed.

Drawings

FIG. 1 is a schematic cross-sectional view of a motor of one embodiment.

Fig. 2 is an exploded perspective view of a stator of one embodiment.

Fig. 3 is a perspective view of a stator of an embodiment.

Fig. 4 is a top view of a stator of an embodiment.

Fig. 5 is a top view of a portion of a stator of an embodiment.

Fig. 6 is a longitudinal sectional view of a portion of a stator of one embodiment.

Fig. 7 is a perspective view of a cap member of one embodiment.

Fig. 8 is a partial perspective view of a connection portion of a coil lead wire according to an embodiment.

Fig. 9 is a plan view of a part of a connection portion of a coil lead wire according to an embodiment.

Fig. 10 is a cross-sectional view of a connection portion of a coil lead wire according to an embodiment.

Description of the reference numerals

5: boss (insulator protrusion); 10: a motor; 11: a housing; 20: a rotor; 30: a stator; 31: a stator core; 31a: the back of the iron core; 31b: a tooth portion; 40: a coil; 41: a coil wire; 41c: a coil outgoing line; 50: an insulating member; 53: an outer side wall portion (wall portion); 53d: an insulator inclined surface; 54: an inner side wall portion; 6: a bus bar unit; 6A, 6B: a cover member; 60: a bus bar holder; 61: a coil insertion hole; 62: a holder main body portion; 62b: a flange portion; 621: a retainer inclined surface; 623: a fixing hole; 64: a flange hole; 66: an inner side wall portion; 67: an outer side wall portion; 70: a bus bar; 71: a bus bar main body portion; 72: a coil connection part; 721: a bus bar protrusion; 80: a cap member; 81: a cap body portion; 82: a cap extension; 83: a protruding portion; CL: a center line; j: a central axis.

Detailed Description

Embodiments of the motor 10 and the stator 30 are described below with reference to the drawings. In the following description, the axial direction of the central axis J of the motor 10 is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J is simply referred to as the "circumferential direction".

In the following description, the arrangement relationship between the respective portions of the motor 10 and the stator 30 will be described with one side in the axial direction as the upper side and the other side in the axial direction as the lower side. However, the posture of the motor 10 and the stator 30 in actual use is not limited to the up-down direction described in the present specification.

Fig. 1 is a schematic cross-sectional view of a motor 10 of the present embodiment. Fig. 2 is an exploded perspective view of the stator 30 of the present embodiment. Fig. 3 is a perspective view of the stator 30. Fig. 4 is a top view of the stator 30. Fig. 5 is a top view of a portion of stator 30.

As shown in fig. 1, the motor 10 of the present embodiment includes a rotor 20 centered on a central axis J, a stator 30 disposed radially outward of the rotor 20, a housing 11, and a plurality of bearings 15 and 16. The motor 10 of the present embodiment is an inner rotor type motor. The rotor 20 rotates around the central axis J.

The housing 11 houses the rotor 20 and the stator 30. The housing 11 has a cylindrical portion 11a, a bottom wall portion 11c, and a bearing retaining wall portion 11d. The cylindrical portion 11a has a cylindrical shape extending along the central axis J. The bearing holding wall portion 11d covers an opening of one axial side of the cylindrical portion 11 a. The bearing holding wall 11d is fixed to the inner peripheral surface of the tube 11 a. The bearing retaining wall portion 11d retains the bearing 15. The bottom wall portion 11c covers the opening of the other axial side of the tube portion 11 a. The bottom wall portion 11c holds the bearing 16.

The refrigerant flows inside the casing 11. The tube portion 11a is provided with a refrigerant inlet 11p and a refrigerant outlet 11q. The refrigerant inflow port 11p and the refrigerant discharge port 11q are arranged in the axial direction. The refrigerant inflow port 11p is located on one side in the axial direction with respect to the stator 30, and the refrigerant discharge port 11q is located on the other side in the axial direction with respect to the stator 30. The refrigerant flows from one side to the other side in the axial direction of the stator 30 through the grooves of the stator 30 in the casing 11.

The rotor 20 is radially opposed to the stator 30. The rotor 20 of the present embodiment is disposed radially inward of the stator 30. Rotor 20 includes shaft 21, rotor core 22, and magnet 23. The shaft 21 has a cylindrical shape extending in the axial direction. The shaft 21 may have a cylindrical shape extending in the axial direction. The shaft 21 is supported rotatably about the central axis J by a plurality of bearings 15, 16. The plurality of bearings 15 and 16 are disposed at intervals in the axial direction and supported by the housing 11. That is, the shaft 21 is supported by the housing 11 via a plurality of bearings 15 and 16.

The rotor core 22 has a cylindrical shape extending in the axial direction. The outer diameter of rotor core 22 is larger than the outer diameter of shaft 21. The length of the rotor core 22 in the axial direction is smaller than the length of the shaft 21 in the axial direction. The inner peripheral surface of the rotor core 22 is fixed to the outer peripheral surface of the shaft 21. The rotor core 22 is fixed to the shaft 21 by press fitting, adhesion, or the like. The rotor core 22 is axially located between the pair of bearings 15, 16. The magnet 23 is fixed to the outer peripheral portion of the rotor core 22.

The stator 30 and the rotor 20 are opposed to each other with a gap therebetween in the radial direction. The stator 30 surrounds the rotor 20 over the entire circumferential range from the radially outer side. The stator 30 includes a stator core 31, an insulator 50, a plurality of coils 40, and a bus bar unit 6 (see fig. 3 to 5).

The stator core 31 surrounds the rotor 20 from the radially outer side. The stator core 31 is formed of, for example, a plurality of electromagnetic steel plates stacked in the axial direction. Stator core 31 is fixed to the inner peripheral surface of case 11. The stator core 31 and the housing 11 are fixed by, for example, press-fitting or press-fitting.

The stator core 31 has a core back 31a and a plurality of teeth 31b. The core back 31a has a ring shape centered on the central axis J. An outer peripheral surface of the core back 31a facing radially outward is fixed to an inner peripheral surface of the tube 11 a.

The tooth 31b extends radially inward from the core back 31 a. The plurality of teeth 31b are arranged along the circumferential direction. The plurality of teeth 31b are arranged at intervals in the circumferential direction. The radially inner side surface of each tooth 31b faces the radially outer side surface of the rotor 20 with a gap therebetween.

A plurality of insulators 50 are mounted to stator core 31. The plurality of insulators 50 are mounted to the plurality of teeth 31b from the radially inner side, respectively. The insulator 50 is an insulating member that insulates between the coil 40 and the tooth 31b. The insulator 50 is made of, for example, resin.

The insulator 50 has an insulator main body portion 51, an outer side wall portion (wall portion) 53, and an inner side wall portion 54. The stator 30 of the present embodiment is provided with 15 insulators 50.

The insulator main body 51 has a square tubular shape extending in the radial direction. The insulator main body 51 is provided with a through hole 51h penetrating in the radial direction. The tooth 31b is inserted into the through hole 51h. Thus, the insulator main body portion 51 surrounds the tooth portion 31b.

The inner wall portion 54 extends from the radially inner end of the insulator main body portion 51 in a direction perpendicular to the radial direction. Similarly, the outer side wall portion 53 extends from the radially outer end portion of the insulator main body portion 51 in a direction perpendicular to the radial direction.

The inner wall 54 and the outer wall 53 are plate-shaped, and the plate surfaces extend in a curved manner in the circumferential direction. That is, the inner side wall portion 54 and the outer side wall portion 53 extend in the circumferential direction. The inner side wall portion 54 and the outer side wall portion 53 of the plurality of insulators 50 are respectively arranged in a ring shape in the circumferential direction.

As shown in fig. 3 and 4, a boss 5 (insulator protrusion) that fixes the busbar unit 6 is provided at the upper end edge 53b of the outer side wall portion 53. That is, the insulator 50 has the boss 5. The boss 5 protrudes above a holder main body 62, which will be described later, of the busbar unit 6 located above the insulator 50. The boss 5 extends upward from the upper end edge 53b of the outer side wall 53. The boss 5 has a columnar column portion 5a and a drop-off preventing portion 5b located at the front end of the column portion 5 a. The outer diameter of the post 5a is smaller than the inner diameter of the flange hole 64. The post portion 5a of the boss 5 passes through the flange hole 64. The distal end of the boss 5 is, for example, heat-welded or heat-pressure-bonded, so that the retaining portion 5b is formed into a substantially circular shape when viewed from the axial direction. The outer diameter of the drop-off preventing portion 5b is larger than the circumferential notch width of the flange hole 64. The drop-off prevention portion 5b is in contact with the upper surface of the flange portion 62b of the holder main body portion 62.

As shown in fig. 1, the coil 40 is constituted by a coil wire 41 wound in a plurality of layers. The plurality of coils 40 are wound around the insulator 50, respectively. The coil 40 is located between the inner wall portion 54 and the outer wall portion 53 in the radial direction. That is, the inner side wall portion 54 and the outer side wall portion 53 guide the coil 40 from both sides in the radial direction. The inner side wall portion 54 and the outer side wall portion 53 inhibit the coil 40 from being radially separated from the insulator 50.

As shown in fig. 2, the coils 40 wound around the insulators 50 arranged adjacently in the circumferential direction are adjacent to each other in the slots. The coil 40 is formed by winding a coil wire 41 in a plurality of layers. The total number of turns of the coil wire 41 wound around the coil 40 of each insulator 50 is equal, respectively. The coil wires 41 constituting the coils 40 are coil wires of the same type, and the magnetic flux densities of the magnetic fields generated by the coils 40 are substantially equal. Here, the "number of turns of the coil wire" with respect to the coil 40 means the local number of turns (i.e., the number of layers) of the coil 40 at a specific position in the radial direction, and does not mean the total number of turns of 1 coil as a whole (the entire region from the radial inner side to the radial outer side).

The coil 40 is mounted on the tooth 31b together with the insulator 50 in a state of being wound around the insulator 50.

Next, the bus bar unit 6 will be described in detail. As shown in fig. 1, the bus bar unit 6 corresponds to the cover member 6A disposed on the upper side among the 2 cover members 6A and 6B disposed on both sides, that is, the upper side and the lower side, of the coil 40 in the axial direction. Since the lower cover member 6B has substantially the same structure as the upper cover member 6A, a detailed description thereof is omitted here.

The motor 10 of the present embodiment is a three-phase motor. The three phases are U-phase, V-phase and W-phase. In the case of a three-phase motor, each coil 40 of the U-phase, V-phase, and W-phase is electrically connected to the busbar unit 6.

As shown in fig. 1 to 3, the bus bar unit 6 is located at the upper side of the stator core 31. The busbar unit 6 has a busbar holder 60, a busbar 70, and a cap member 80 shown in fig. 7.

Fig. 6 is a longitudinal sectional view of a part of the stator 30. As shown in fig. 4 and 6, the bus bar 70 has an annular bus bar body portion 71 and a plurality of coil connection portions 72 extending from the bus bar body portion 71 and electrically connected to the coil lead wires 41c of the coils 40. The bus bar 70 is insert molded to the bus bar holder 60.

The bus bar 70 has a bus bar main body portion 71 extending in the circumferential direction. The bus bar body portion 71 is located radially inward of the outer side wall portion 53 of the insulator 50, and is located in a direction approaching the coil 40 in the axial direction than an end portion of the outer side wall portion 53, and the bus bar 70 is manufactured by bending a blank obtained by punching a metal plate with a die.

As shown in fig. 3 and 4, the plurality of coil connecting portions 72 are arranged along the circumferential direction. The coil connection portion 72 is a plate-like conductive member having a circumferential direction as a thickness direction. The coil connecting portion 72 protrudes upward from the holder body portion 62 on one side in the circumferential direction of the coil insertion hole 61 described later. The connection surface 72a on the other circumferential side of the coil connection portion 72 is exposed to the coil insertion hole 61. The coil connecting portion 72 has a rectangular shape long in the radial direction when viewed in the axial direction. As shown in fig. 6, the connection surface 72a of the coil connection portion 72 has a bus bar protrusion 721 (see fig. 8) extending in the radial direction and protruding toward the other side in the circumferential direction. That is, the coil connecting portion 72 has a circumferential direction in the plate thickness direction.

The bus bar holder 60 has a coil insertion hole 61 penetrating the bus bar body 71 in the axial direction, a holder body 62 holding the bus bar body 71, and a plurality of flange holes 64 fixed to the insulator 50. The holder body 62 has a disk shape centered on the central axis J and along a plane perpendicular to the central axis J. The bus bar holder 60 is made of resin.

As shown in fig. 4, 5 and 8, the coil insertion holes 61 are arranged at intervals in the circumferential direction between an inner wall 66 and an outer wall 67, which will be described later. The coil lead wire 41c passes through the coil insertion hole 61 and is electrically connected to the coil connection portion 72 on one side in the axial direction of the holder main body portion 62. A coil insertion hole 61 through which the coil lead-out wire 41c from which the winding of the coil 40 starts and a coil insertion hole 61 through which the coil lead-out wire 41c from which the winding of the coil 40 ends are inserted are disposed adjacently in the circumferential direction.

The coil insertion hole 61 has an insertion hole groove portion 611 extending in the axial direction and recessed to one circumferential side. The coil lead wire 41c is disposed in the insertion hole groove 611. The coil insertion hole 61 has a tapered portion 612 whose diameter becomes smaller as going from the lower side surface of the holder main body portion 62 toward the upper side. The tapered portion 612 is disposed coaxially with the coil insertion hole 61. The insertion hole groove 611 is provided above the tapered portion 612.

As shown in fig. 1, the holder body 62 is located on the upper side (one side in the axial direction) of the coil 40 and on the lower side (the other side in the axial direction) of the coil lead wire 41 c. The holder body 62 defines a region in which the coil 40 is disposed and a region in which the coil lead wire 41c is disposed. The holder body 62 ensures insulation between the coil 40 and the coil lead wire 41 c.

The holder body 62 has an inner wall 66 extending radially inward from the holder body 62 to one side in the axial direction and an outer wall 67 extending radially outward from the holder body 62 to one side in the axial direction. The end of the coil lead wire 41c and the coil connecting portion 72 are covered with an adhesive R injected into the space sandwiched by the holder main body portion 62, the inner side wall portion 66, and the outer side wall portion 67. As shown in fig. 3, 4 and 5, the outer side wall portion 67 has a recess 671 recessed radially inward at a position of the flange hole 64 toward the radially inward side.

As shown in fig. 1 and 6, the holder main body portion 62 extends in the circumferential direction through between the outer side wall portion 53 and the inner side wall portion 54 of the insulator 50. Here, the radially inward surface of the outer side wall portion 53 is referred to as an inner side surface 53c. That is, the insulator 50 has an inner side surface 53c facing radially inward. The holder main body 62 contacts the inner surface 53c from the radially inner side. Accordingly, the bus bar holder 60 supports the inner surface 53c from the radially inner side, and suppresses the insulator 50 from moving radially inward.

As shown in fig. 6, the upper portion of the outer side wall portion 53 has an insulator inclined surface 53d that gradually inclines downward toward the radial inner side. The holder main body 62 has a holder inclined surface 621 that gradually inclines downward toward the radial inner side. The insulator inclined surface 53d and the holder inclined surface 621 are provided in a state of being in surface contact with each other or in a state of being in close proximity to each other.

The holder main body 62 has a flange portion 62b protruding radially outward from the outer side wall portion 53 on the radially outer peripheral side. The flange 62b extends radially outward of the retainer inclined surface 621. The flange portion 62b has a flange hole 64 penetrating in the axial direction. The flange portion 62b axially faces the retaining portion 5b of the boss 5. Boss 5 protruding upward from outer wall 53 of insulator 50 penetrates in the axial direction and is fixed to flange hole 64. The bus bar holder 60 is fixed to the insulator 50 by, for example, heat welding or thermocompression bonding the retaining portion 5b of the boss 5 penetrating the flange hole 64.

When current is supplied to the stator 30, magnetic poles are generated at the coil 40, and a magnetic force directed in the radial direction is applied to the coil 40 and the insulator 50 around which the coil 40 is wound. The insulator 50 of the present embodiment is attached to the tooth portion 31b from the radially inner side. Therefore, if a force is applied to the coil 40 and the insulator 50 toward the radial direction, the insulator 50 may be separated from the tooth 31b. According to the present embodiment, the bus bar unit 6 can fix the insulator 50 to the stator core 31 by restricting the insulator 50 from moving radially inward. This can suppress interference between the insulator 50 and the rotor 20, and can improve the reliability of the motor 10.

According to the present embodiment, the outer side wall portions 53 of the plurality of insulators 50 are arranged in a ring shape in the circumferential direction, and the bus bar holder 60 is fitted inside the plurality of outer side wall portions 53. Accordingly, the insulators 50 located on opposite sides with respect to the central axis J are arranged so as to sandwich the bus bar holder 60, and thereby each sandwich the bus bar holder 60 to suppress movement in the radial direction. That is, according to the present embodiment, the bus bar holder 60 is not easily moved in any direction in the plane perpendicular to the central axis J, and the stability of the movement inhibition of the insulator 50 can be improved.

As shown in fig. 5 to 10, the cap member 80 is disposed on one axial side of the bus bar holder 60. The cap member 80 has a cap main body portion 81 extending in the circumferential direction, a plurality of cap extension portions 82 extending in the radial direction from the cap main body portion 81, and a projection portion 83 extending from the cap extension portion 82 to the other side in the axial direction. The cap member 80 is provided in plurality in the circumferential direction. The plurality of cap members 80 each have a circular arc-shaped cap main body portion 81 and a plurality of cap extension portions 82.

As shown in fig. 10, the surface 82a on one circumferential side of the cap extension 82 is in contact with the connection surface 72a on the other circumferential side of the coil connection portion 72. As shown in fig. 5, the coil connection portion 72, the coil lead wire 41c, and the cap extension 82 are arranged in this order from the circumferential side when viewed from above.

The protrusion 83 is inserted into the coil insertion hole 61. The cap extension 82 and the protrusion 83 have cap groove portions 84 extending in the axial direction and recessed toward the other circumferential side. The coil lead wire 41c is disposed in the cap groove 84.

As shown in fig. 2, the stator 30 of the present embodiment is provided with 2 cover members 6A and 6B. The 2 cover members 6A, 6B sandwich the plurality of insulators 50 from the up-down direction. One cover member 6A supports the inner side surface 53c of the outer side wall portion 53 on the upper side of the plurality of insulators 50. The lower cover member 6B supports the inner surface 53c of the outer wall 53 below the plurality of insulators 50. Since the 2 cover members 6A and 6B support the insulator 50 at both the upper and lower sides, the insulator 50 can be stably restrained from moving radially inward.

Next, an assembling process of the stator 30 will be described with reference to fig. 2. First, the coil wire 41 is wound around the insulator 50, and the coil 40 is provided. Next, the insulator 50 is mounted to the tooth portion 31b from the radially inner side.

Next, the lower cover member 6B is attached to the insulator 50 from below. At this time, the boss 5 of the insulator 50 is inserted into the flange hole 64 of the holder body 62, and the boss 5 is thermally compressed, whereby the drop-off preventing portion 5b is provided at the tip end of the boss 5. Thereby, the lower cover member 6B is fixed to the insulator 50.

Next, the insulating paper 3 is inserted from above between the inner peripheral surface of the core back 31a and the outer side wall portion 53 of the insulator 50. The bus bar unit 6 (6A) is attached to the insulator 50 from above. At this time, the boss 5 of the insulator 50 is inserted into the flange hole 64 of the insulator 50, and the boss 5 is thermally compressed, whereby the drop-off preventing portion 5b is provided at the tip end of the boss 5. Thereby, the upper bus bar unit 6 is fixed to the insulator 50.

According to the present embodiment, the stator core 31, the coil 40, the bus bar 70, the bus bar holder 60, and the cap member 80 disposed on one axial side of the bus bar holder 60 are provided. The bus bar 70 has an annular bus bar body portion 71 and a coil connection portion 72 extending from the bus bar body portion 71 and electrically connected to a coil lead wire 41c, the coil lead wire 41c being an end portion of a coil wire constituting the coil 40. The bus bar holder 60 has a holder body portion 62 that holds the bus bar body portion 71, and a coil insertion hole 61 that penetrates the bus bar body portion 71 in the axial direction. The coil lead wire 41c passes through the coil insertion hole 61 and is electrically connected to the coil connecting portion 72 on one side in the axial direction of the holder main body portion 62. The cap member 80 has a cap main body portion 81 extending in the circumferential direction, a plurality of cap extension portions 82 extending in the radial direction from the cap main body portion 81, and a projection portion 83 extending from the cap extension portion 82 to the other side in the axial direction. The protrusion 83 is inserted into the coil insertion hole 61. On one axial side of the bus bar holder 60, the coil connection portion 72 and the coil lead wire 41c are covered with an adhesive R. Therefore, the coil lead wire 41c axially penetrates the coil insertion hole 61 of the holder main body 62 and is electrically connected to the coil connection portion 72 located on the upper side of the holder main body 62. Since the protrusion 83 of the cap member 80 is inserted into the coil insertion hole 61 together with the coil lead-out wire 41c and the coil insertion hole 61 is closed by the protrusion 83, the adhesive R injected into the upper side of the holder main body 62 can be prevented from leaking out to the lower side of the holder main body 62 through the coil insertion hole 61.

The cap member 80 is provided to a cap main body 81 extending in the circumferential direction through a cap extension 82, and a plurality of protrusions 83 inserted into the plurality of coil insertion holes 61 are provided at predetermined intervals in the circumferential direction. Therefore, the plurality of projections 83 can be easily inserted and attached.

According to the present embodiment, the bus bar 70 is a plate-like conductive member, the coil connection portion 72 has a circumferential direction in the plate thickness direction, and the coil connection portion 72, the coil lead-out wire 41c, and the cap extension 82 are arranged in this order from one circumferential side. Accordingly, after the coil lead-out wire 41c is inserted through the coil insertion hole 61 and disposed on the connection surface 72a of the coil connection portion 72, the cap member 80 is rotated from the other side to one side in the circumferential direction, whereby the cap extension 82 can be brought close to the coil connection portion 72. In this way, the cap member 80 can be rotated from a position shifted from a predetermined position in the circumferential direction, and the coil lead-out wire 41c can be sandwiched between the coil connecting portion 72 and the cap extending portion 82, so that the assembling work can be easily performed.

According to the present embodiment, the surface of one circumferential side of the cap extension 82 is in contact with the surface of the other circumferential side of the coil connecting portion 72. As a result, the surface of the cap extension 82 is in surface contact with the connection surface 72a of the coil connection portion 72, and therefore the coil lead-out wire 41c disposed between the surfaces can be reliably held and pressed to be fixed.

According to the present embodiment, the cap extension 82 and the protrusion 83 have cap groove portions 84 extending in the axial direction and recessed toward the other circumferential side. The coil lead wire 41c is disposed in the cap groove 84. Thereby, the coil outgoing line 41c inserted into the coil insertion hole 61 is inserted into the cap groove 84 of the protrusion 83 simultaneously inserted into the coil insertion hole 61. Therefore, it is possible to effectively suppress the adhesive R from leaking out to the lower side of the holder main body 62 through the coil insertion hole 61 by generating a gap between the protruding portion 83 and the inner peripheral surface of the coil insertion hole 61 as in the case where the protruding portion 83 is elastically deformed by the coil lead-out wire 41c and inserted into the coil insertion hole 61.

According to the present embodiment, a plurality of cap members 80 are provided in the circumferential direction, and the plurality of cap members 80 each have a circular arc-shaped cap body portion 81 and a plurality of cap extension portions 82. Accordingly, the cap member 80 is divided in the circumferential direction, so that the operation of fitting the plurality of projections 83 into the coil insertion holes 61 is easy, and the assembly efficiency of the cap member 80 can be improved.

According to the present embodiment, the coil insertion hole 61 has an insertion hole groove portion 611 extending in the axial direction and recessed to one side in the circumferential direction. The coil lead wire 41c is disposed in the insertion hole groove 611. Thereby, the coil lead wire 41c inserted into the coil insertion hole 61 is fitted into the insertion hole groove 611. Therefore, the adhesive R can be inserted into the coil insertion hole 61 without causing the protrusion 83 to interfere with the coil lead-out wire 41c, and the adhesive R can be effectively prevented from leaking out to the lower side on the other axial side of the holder main body 62 through the coil insertion hole 61 by the occurrence of a gap between the protrusion 83 and the inner peripheral surface of the coil insertion hole 61.

According to the present embodiment, the coil insertion hole 61 has the tapered portion 612 whose diameter becomes smaller as going from the lower side surface of the holder main body portion 62 toward the upper side. The insertion hole groove 611 is provided on one axial side of the tapered portion 612. Accordingly, the opening of the coil insertion side of the tapered portion of the coil insertion hole is enlarged, and therefore the coil lead-out wire 41c can be easily inserted into the coil insertion hole 61.

According to the present embodiment, there is an insulator 50 attached to the stator core 31. The insulator 50 has an outer side wall portion 53 extending in the circumferential direction and the axial direction on the radially outer side of the coil 40, and a boss 5 extending from the outer side wall portion 53 to one side in the axial direction. The bus bar holder 60 has an inner wall portion 66 extending from the holder main body portion 62 to one side in the axial direction on the radially inner side of the coil insertion hole 61, an outer wall portion 67 extending from the holder main body portion 62 to one side in the axial direction on the radially outer side of the coil insertion hole 61, and a flange portion 62b extending from the holder main body portion 62 to the radially outer side on the radially outer side of the outer wall portion 67. The flange portion 62b has a flange hole 64 into which the boss 5 is inserted. The outer side wall portion 67 has a recess 671 recessed radially inward at a position of the flange hole 64 toward the radially inward side. Thereby, at least a part of the boss 5 can be disposed inside the recess 671. Accordingly, since the boss 5 can be positioned radially inward, the radial dimension of the stator 30 can be reduced to achieve miniaturization.

According to the present embodiment, the coil connecting portion 72 has the bus bar protruding portion 721 extending in the radial direction and protruding toward the other circumferential side. This facilitates welding of the coil lead-out wire 41c inserted through the coil insertion hole 61 to the bus bar protruding portion 721, and thus can improve welding accuracy.

According to the present embodiment, the stator 30 and the rotor 20 which is rotatably supported so as to be opposed to the stator 30 in the radial direction are provided.

While the embodiments of the present invention have been described above, the configurations and combinations thereof in the embodiments are merely examples, and the configurations may be added, omitted, substituted, and other modified 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 motor mounted on the compressor has been described, but the same configuration may be adopted for the motor mounted on the water pump or the oil pump.

Claims (10)

1. A stator, wherein,

the stator comprises a stator core, a coil, a bus bar holder, and a cap member arranged on one side of the bus bar holder in the axial direction,

the bus bar has:

an annular bus bar main body portion; and

a coil connection part extending from the bus bar body part and electrically connected with a coil lead wire, the coil lead wire being an end part of a coil wire constituting the coil,

the bus bar holder has:

a holder body portion that holds the bus bar body portion; and

a coil insertion hole penetrating the bus bar main body portion in an axial direction,

the coil lead-out wire passes through the coil insertion hole and is electrically connected to the coil connection portion at one side of the holder body portion in the axial direction,

the cap member has:

a cap body portion extending in a circumferential direction;

a plurality of cap extensions extending radially from the cap body portion; and

a protrusion extending from the cap extension to the other axial side,

the protrusion is inserted into the coil insertion hole,

the coil connection portion and the coil outgoing line are covered with an adhesive on one axial side of the bus bar holder.

2. The stator of claim 1, wherein,

the bus bar is a plate-like conductive member,

the plate thickness direction of the coil connecting portion is the circumferential direction,

the coil connection portion, the coil lead-out wire, and the cap extension portion are arranged in this order from one circumferential side.

3. The stator according to claim 1 or 2, wherein,

a surface of one circumferential side of the cap extension portion is in contact with a surface of the other circumferential side of the coil connecting portion.

4. The stator according to any one of claim 1 to 3, wherein,

the cap extension and the protrusion have cap groove portions extending in the axial direction, the cap groove portions being recessed toward the other circumferential side,

the coil lead-out wire is disposed in the cap groove portion.

5. The stator according to any one of claims 1 to 4, wherein,

the cap member is provided with a plurality in the circumferential direction,

the plurality of cap members each have an arcuate cap body portion and a plurality of cap extension portions.

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

the coil insertion hole has an insertion hole groove portion extending in an axial direction, the insertion hole groove portion being recessed to one side in a circumferential direction,

the coil lead wire is disposed in the insertion hole groove portion.

7. The stator of claim 6, wherein,

the coil insertion hole has a tapered portion whose diameter becomes smaller as it goes from the other axial side face of the holder main body portion toward one axial side,

the insertion hole groove portion is provided at a position on one axial side of the tapered portion.

8. The stator according to any one of claims 1 to 7, wherein,

the stator has an insulator mounted to the stator core,

the insulator has:

a wall portion extending in a circumferential direction and an axial direction radially outside the coil; and

an insulator protrusion extending from the wall portion to one axial side,

the bus bar holder has:

an inner wall portion extending from the holder body portion to one side in the axial direction on the inner side in the radial direction of the coil insertion hole;

an outer side wall portion extending from the holder body portion to one axial side in a radial outer side of the coil insertion hole; and

a flange portion extending radially outward from the holder body portion radially outward of the outer side wall portion,

the flange portion has a flange hole into which the insulator protrusion is inserted,

the outer side wall portion has a recess recessed radially inward at a position of the flange hole facing radially inward.

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

the coil connection portion has a bus bar protruding portion extending in a radial direction, the bus bar protruding portion protruding to the other side in the circumferential direction.

10. A motor, comprising:

the stator of any one of claims 1 to 9; and

and a rotor which is radially opposed to the stator and is rotatably supported.