JP2023151452A - stator and motor - Google Patents

Abstract

To suppress the leakage of an adhesive that insulates a connection portion of a coil lead wire to the coil side.SOLUTION: A bus bar holder 60 includes a holder body portion 62 that holds a bus bar body portion 71, and a first insertion hole 61 that passes through the holder body portion in the axial direction and into which a coil lead wire 41c is inserted. A coil support 80 includes a coil support body portion 81 that extends in a direction crossing the axial direction, a cylindrical support portion 82 extending from the coil support body portion to one side in the axial direction, a second insertion hole 83 that passes through the support portion in the axial direction and into which the coil lead wire is inserted, and a convex portion 84 recessed toward the other axial side on one axial side surface of the coil support body portion. On one axial side of the bus bar holder, a coil connection portion 72 and the end of the coil lead wire are covered with an adhesive R.SELECTED DRAWING: Figure 6

Description

The present invention relates to a stator and a motor.

A stator is known in which a bus bar and a connecting portion of a coil lead wire are covered with an insulating resin. In the stator described in Patent Document 1, by covering the connection portion between the bus bar and the coil lead wire with an insulating resin, the insulation of the connection portion is ensured, and the intrusion of water and foreign matter into the coil side is suppressed. The configuration is disclosed.

Patent No. 4851966

The bus bar holder is provided with an insertion hole for pulling out the coil lead wire upward. When resin was injected, there was a risk that the resin would pass through the insertion hole and leak to the coil side.

In view of the above-mentioned circumstances, one of the objects of the present invention is to provide a stator and a motor that suppress leakage of adhesive that insulates the connecting portion of the coil lead wire to the coil side.

One aspect of the stator of the present invention includes a stator core, a coil, a bus bar, a bus bar holder, and a coil support disposed between the coil and the bus bar holder in the axial direction. The bus bar includes an annular bus bar main body and a coil connecting part that extends from the bus bar main body and is electrically connected to a coil lead wire that is an end of a coil wire that constitutes the coil. The busbar holder includes a holder main body that holds the busbar main body, and a first insertion hole that axially passes through the holder main body and into which the coil lead wire is inserted. The coil support includes a coil support main body part that extends in a direction crossing the axial direction, a cylindrical support part extending from the coil support main body part to one side in the axial direction, and a cylindrical support part that penetrates the support part in the axial direction, and the coil It has a second insertion hole through which a lead wire is inserted, and a recessed portion recessed toward the other axial side on one axial side surface of the coil support main body. On one axial side of the bus bar holder, the coil connection portion and the end portion of the coil leader wire are covered with an adhesive.

One aspect of the motor of the present invention includes the above-described stator and a rotor that faces the stator in a radial direction and is rotatably supported.

According to one aspect of the present invention, in a stator of a motor, leakage of an adhesive that insulates a connecting portion of a coil lead wire to a coil side is suppressed.

FIG. 1 is a schematic cross-sectional view of a motor according to one embodiment. FIG. 2 is an exploded perspective view of the stator of one embodiment. FIG. 3 is a perspective view of the stator of one embodiment. FIG. 4 is a plan view of the stator of one embodiment. FIG. 5 is a plan view of the holder main body of one embodiment viewed from the other side in the axial direction. FIG. 6 is a longitudinal cross-sectional view of a portion of the stator of one embodiment. FIG. 7 is a perspective view of a coil support of one embodiment. FIG. 8 is a perspective view of a portion of the coil support of one embodiment. FIG. 9 is a perspective view of a portion of a modified coil support.

Hereinafter, embodiments of the motor 10 and the stator 30 will be described based on the drawings.
In the following description, the axial direction of the central axis J of the motor 10 will be simply referred to as the "axial direction", and the radial direction centered on the central axis J will be simply referred to as the "radial direction", and the radial direction around the central axis J will be simply referred to as the "radial direction". The direction is simply called the "circumferential direction."

Furthermore, in the following description, the arrangement of the parts of the motor 10 and the stator 30 will be described with one axial side as the upper side and the other axial side as the lower side. However, the postures of the motor 10 and the stator 30 during actual use are not limited to the vertical direction described in this specification.

FIG. 1 is a schematic cross-sectional view of a motor 10 of this embodiment. FIG. 2 is an exploded perspective view of the stator 30 of this embodiment. FIG. 3 is a perspective view of the stator 30. FIG. 4 is a plan view of the stator 30. FIG. 5 is a plan view of the holder main body viewed from the other axial side.

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

Housing 11 accommodates rotor 20 and stator 30. The housing 11 includes a cylindrical portion 11a, a bottom wall portion 11c, and a bearing holding 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 on one axial side of the cylindrical portion 11a. The bearing holding wall portion 11d is fixed to the inner circumferential surface of the cylindrical portion 11a. The bearing holding wall portion 11d holds the bearing 15. The bottom wall portion 11c covers the opening on the other axial side of the cylinder portion 11a. The bottom wall portion 11c holds the bearing 16.

A refrigerant flows inside the housing 11 . The cylinder portion 11a is provided with a refrigerant inlet 11p and a refrigerant outlet 11q. The refrigerant inlet 11p and the refrigerant outlet 11q are arranged side by side in the axial direction. The refrigerant inlet 11p is located on one side of the stator 30 in the axial direction, and the refrigerant outlet 11q is located on the other side of the stator 30 in the axial direction. The refrigerant passes through the slots of the stator 30 in the housing 11 and flows from one side of the stator 30 in the axial direction to the other side.

The rotor 20 faces the stator 30 in the radial direction. The rotor 20 of this embodiment is arranged radially inside the stator 30. The rotor 20 includes a shaft 21, a rotor core 22, and a magnet 23. The shaft 21 has a cylindrical shape extending in the axial direction. Note that the shaft 21 may have a cylindrical shape extending in the axial direction. The shaft 21 is rotatably supported around a central axis J by a plurality of bearings 15 and 16. The plurality of bearings 15 and 16 are spaced apart from each other in the axial direction and are 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 rotor core 22 has a larger outer diameter than the shaft 21. The rotor core 22 has a smaller axial length than the shaft 21. 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, adhesive, or the like. The rotor core 22 is located between the pair of bearings 15 and 16 in the axial direction. The magnet 23 is fixed to the outer periphery of the rotor core 22.

The stator 30 faces the rotor 20 with a gap in the radial direction. The stator 30 surrounds the rotor 20 from the outside in the radial direction all the way around in the circumferential direction. The stator 30 includes a stator core 31, an insulator 50, a plurality of coils 40, and a busbar unit 6 (see FIGS. 3 to 5).

Stator core 31 surrounds rotor 20 from the outside in the radial direction. The stator core 31 is composed of, for example, a plurality of electromagnetic steel plates laminated in the axial direction. Stator core 31 is fixed to the inner peripheral surface of housing 11. The stator core 31 and the housing 11 are fixed by, for example, shrink fitting, press fitting, or the like.

Stator core 31 has a core back portion 31a and a plurality of teeth portions 31b. The core back portion 31a has an annular shape centered on the central axis J. The outer circumferential surface of the core back portion 31a facing outward in the radial direction is fixed to the inner circumferential surface of the cylindrical portion 11a.

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

The plurality of insulators 50 are attached to the stator core 31. The plurality of insulators 50 are attached to each of the plurality of teeth portions 31b from the inside in the radial direction. The insulator 50 is an insulating member that insulates between the coil 40 and the teeth portion 31b. The insulator 50 is made of resin, for example.

The insulator 50 includes an insulator main body 51 , an outer wall (wall) 53 , and an inner wall 54 . The stator 30 of this embodiment is provided with 15 insulators 50.

The insulator main body portion 51 has a rectangular tube shape extending in the radial direction. The insulator main body portion 51 is provided with a through hole 51h that penetrates in the radial direction. The teeth portion 31b is passed through the through hole 51h. Therefore, the insulator main body portion 51 surrounds the teeth portion 31b.

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

The inner wall portion 54 and the outer wall portion 53 have plate shapes whose plate surfaces extend in a curved manner along the circumferential direction. That is, the inner wall portion 54 and the outer wall portion 53 extend along the circumferential direction. The inner wall portions 54 and outer wall portions 53 of the plurality of insulators 50 are arranged in an annular shape along the circumferential direction.

As shown in FIGS. 3 and 4, a boss 5 (insulator protrusion) for fixing the busbar unit 6 is provided on the upper edge 53b of the outer wall portion 53. As shown in FIGS. That is, the insulator 50 has the boss 5. The boss 5 protrudes above a holder main body portion 62, which will be described later, of the bus bar unit 6 located above the insulator 50. The boss 5 extends upward from the upper edge 53b of the outer wall portion 53. The boss 5 has a cylindrical column portion 5a and a retaining portion 5b located at the tip of the column portion 5a. The outer diameter of the columnar portion 5a is smaller than the inner diameter of the flange hole 64. The column portion 5a of the boss 5 passes through the flange hole 64. The retaining portion 5b is formed into a substantially circular shape when viewed from the axial direction by, for example, heat welding or heat caulking the tip of the boss 5. The outer diameter of the retaining portion 5b is larger than the circumferential notch width of the flange hole 64. The retaining portion 5b contacts the upper surface of the flange portion 62b of the holder main body portion 62.

As shown in FIG. 1, the coil 40 consists of a coil wire 41 wound in multiple layers. The plurality of coils 40 are each wound around an insulator 50. 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 wall portion 54 and the outer wall portion 53 guide the coil 40 from both sides in the radial direction. The inner wall portion 54 and the outer wall portion 53 prevent the coil 40 from separating from the insulator 50 in the radial direction.

As shown in FIG. 2, the coils 40 wound around the insulators 50 that are arranged adjacent to each other in the circumferential direction are adjacent to each other in the slots. The coil 40 is constructed by winding a coil wire 41 in multiple layers. The total number of turns of the coil wire 41 of the coil 40 wound around each insulator 50 is equal. Further, the coil wires 41 constituting each coil 40 are of the same type, and the magnetic flux density of the magnetic field generated by each coil 40 is approximately equal. Here, the "number of turns of the coil wire" for the coil 40 is the local number of turns (i.e., the number of layers) of the coil 40 at a specific position in the radial direction, and refers to the local number of turns (i.e., the number of layers) of the coil 40 as a whole (radially inner This does not mean the total number of turns (the entire area radially outward).

The coil 40 is wound around the insulator 50 and is attached to the teeth portion 31b together with the insulator 50.

Next, the busbar unit 6 will be explained in detail. As shown in FIG. 1, the busbar unit 6 has a cover member 6A disposed on the upper side of two cover members 6A and 6B provided on both sides of the coil 40 in the axial direction, that is, on the upper and lower sides. Equivalent to. Since the lower cover member 6B has substantially the same configuration as the upper cover member 6A, detailed description thereof will be omitted here.

Note that the motor 10 of this 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 of the U-phase, V-phase, and W-phase coils 40 is electrically connected to the busbar unit 6.

The busbar unit 6 is located above the stator core 31, as shown in FIGS. 1 to 3. The busbar unit 6 includes a busbar holder 60, a busbar 70, and a coil support 80 shown in FIG.

FIG. 6 is a longitudinal sectional view of a portion of the stator 30. As shown in FIGS. 4 and 6, the busbar 70 includes an annular busbar main body 71 and a plurality of coil connecting parts 72 that extend from the busbar main body 71 and are electrically connected to the coil lead wire 41c of the coil 40. , is provided. The bus bar 70 is insert molded into the bus bar holder 60.

The bus bar 70 has a bus bar body portion 71 that extends along the circumferential direction. The busbar main body 71 is located radially inward of the outer wall 53 of the insulator 50 and closer to the coil 40 in the axial direction than the end of the outer wall 53. It is manufactured by bending a blank punched with a die.

As shown in FIGS. 3 and 4, the plurality of coil connecting portions 72 are arranged along the circumferential direction. The coil connecting portion 72 is a plate-shaped electrically conductive member whose thickness direction is the circumferential direction. The coil connecting portion 72 protrudes upward from the holder main body portion 62 on one side in the circumferential direction of a first insertion hole 61, which will be described later. A connecting surface 72 a on the other side in the circumferential direction of the coil connecting portion 72 is exposed to the first insertion hole 61 . The coil connecting portion 72 has a rectangular shape that is long in the radial direction when viewed from the axial direction. The thickness direction of the coil connecting portion 72 is the circumferential direction.

The busbar holder 60 has a first insertion hole 61 that passes through the busbar body 71 in the axial direction, a holder body 62 that holds the busbar body 71, and a plurality of flange holes 64 that are fixed to the insulator 50. . The holder main body portion 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 FIGS. 4, 5, and 6, the first insertion holes 61 are spaced apart in the circumferential direction between an inner wall portion 66 and an outer wall portion 67, which will be described later. The coil lead wire 41c passes through the first 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 first insertion holes 61 are arranged adjacent to each other in the circumferential direction, through which the coil lead wire 41c at the beginning of winding of the coil 40 is inserted, and through which the coil lead wire 41c at the end of winding of the coil 40 is inserted.

As shown in FIG. 6, the inner circumferential surface of the first insertion hole 61 includes a first tapered part 61a whose diameter gradually decreases from the lower end toward the upper side, and an insertion cylinder part located above the first tapered part 61a. 61b. The inner diameter of the insertion cylinder portion 61b is smaller than the inner diameter of the upper end portion of the first tapered portion 61a. Therefore, the connecting portion between the first tapered portion 61a and the insertion tube portion 61b is stepped.

As shown in FIGS. 1 and 3, the holder main body 62 is located above the coil 40 (on one side in the axial direction) and below the coil leader line 41c (on the other side in the axial direction). The holder main body 62 separates a region where the coil 40 is arranged and a region where the coil lead wire 41c is arranged. The holder main body portion 62 ensures insulation between the coil 40 and the coil lead wire 41c.

The holder main body 62 has an inner wall 66 extending from the holder main body 62 to one side in the axial direction on the inside in the radial direction, and an outer wall 67 extending on the one side in the axial direction from the holder main body 62 on the outside in the radial direction. , has. The end portion of the coil lead wire 41c and the coil connection portion 72 are covered with adhesive R injected into the space sandwiched between the holder main body portion 62, the inner wall portion 66, and the outer wall portion 67. As shown in FIGS. 3, 4, and 5, the outer wall portion 67 has a recess 671 that is recessed radially inward at a position facing radially inward of the flange hole 64. As shown in FIGS.

As shown in FIGS. 1 and 6, the holder main body 62 extends in the circumferential direction between the outer wall 53 and the inner wall 54 of the insulator 50. As shown in FIGS. Here, the surface of the outer wall portion 53 facing inward in the radial direction is referred to as an inner surface 53c. That is, the insulator 50 has an inner surface 53c facing radially inward. The holder main body portion 62 contacts the inner surface 53c from the inside in the radial direction. Thereby, 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 part of the outer wall portion 53 has an insulator inclined surface 53d that gradually slopes downward as it goes radially inward. The holder main body portion 62 has a holder inclined surface 621 that gradually slopes downward as it goes radially inward. The insulator inclined surface 53d and the holder inclined surface 621 are provided in a state in which they are in surface contact with each other or in a state in which they are close to each other.

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

The holder main body portion 62 has a fixing hole 623 passing through it in the axial direction. The fixing hole 623 is located between the inner wall portion 66 and the outer wall portion 67 when viewed from the axial direction. A fixing portion 86 of a coil support 80, which will be described later, passes through and is fixed in the fixing hole 623. The fixing part 86 is fixed to the holder main body part 62 between the inner wall part 66 and the outer wall part 67 when viewed from the axial direction.

When a current is supplied to the stator 30, a magnetic pole is generated in the coil 40, and a radial magnetic force is applied to the coil 40 and the insulator 50 around which the coil 40 is wound. The insulator 50 of this embodiment is attached to the teeth portion 31b from the inside in the radial direction. Therefore, if a force directed inward in the radial direction is applied to the coil 40 and the insulator 50, there is a possibility that the insulator 50 may come off from the teeth portion 31b. According to this embodiment, the insulator 50 can be fixed to the stator core 31 by restricting the movement of the insulator 50 inward in the radial direction by the busbar unit 6 . Thereby, interference between the insulator 50 and the rotor 20 can be suppressed, and the reliability of the motor 10 can be improved.

According to this embodiment, the outer wall portions 53 of the plurality of insulators 50 are arranged in a ring shape along the circumferential direction, and the bus bar holder 60 fits inside the plurality of outer wall portions 53. Therefore, the insulators 50 located on opposite sides of the central axis J are arranged with the bus bar holder 60 sandwiched between them, and each suppresses movement in the radial direction with the bus bar holder 60 sandwiched therebetween. That is, according to this embodiment, the bus bar holder 60 becomes difficult to move in any direction within a plane orthogonal to the central axis J, and the stability of suppressing the movement of the insulator 50 can be improved.

As shown in FIG. 6, the coil support 80 is arranged between the coil 40 and the bus bar holder 60 in the axial direction. The coil support 80 is attached to the bus bar holder 60 by assembling it into the first insertion hole 61 from below. As shown in FIGS. 7 and 8, the coil support 80 includes a coil support main body part 81 that extends in a direction crossing the axial direction, a cylindrical support part 82 that extends upward from the coil support main body part 81, and a support part 82. It has a second insertion hole 83 that passes through the coil support body 81 in the axial direction and into which the coil lead wire 41c is inserted, and a recess 84 that is recessed downward in the upper surface 81a of the coil support body 81.

As shown in FIGS. 6 and 8, the support portion 82 includes a cylindrical portion 82b on the base end 82c side, and a second tapered portion 82a that is provided coaxially with the cylindrical portion 82b and extends upward from the cylindrical portion 82b. A base end 82c of the support portion 82 is provided on a bottom surface 84a of the recess 84. The second tapered portion 82a is provided on at least a portion of the outer circumferential surface of the support portion 82 in the axial direction, and the diameter thereof gradually decreases from the bottom to the top. The upper end portion 82d of the support portion 82 is arranged inside the first insertion hole 61 of the holder main body portion 62. The outer circumferential surface of the support portion 82 is separated from the inner circumferential surface of the first insertion hole 61 over the entire circumference.

The outer circumferential surface of the support portion 82 has an outer circumferential cylindrical surface 824 connected to the coil support main body 81 and an outer circumferential tapered surface 825 provided above the outer circumferential cylindrical surface 824. The outer peripheral tapered surface 825 extends to the upper end portion 82d. The inner circumferential surface of the support portion 82 includes a first inner circumferential cylindrical surface 821 connected to the coil support body 81 , an inner circumferential tapered surface 822 provided above the first inner circumferential cylindrical surface 821 , and an inner circumferential tapered surface 822 . It has a second inner circumferential cylindrical surface 823 provided above. The coil lead wire 41c is inserted inside the second inner peripheral cylindrical surface 823. The inner diameter of the second inner cylindrical surface 823 is slightly larger than the outer diameter of the coil lead wire 41c.

The recess 84 is constituted by an annular protrusion 85 surrounding the support portion 82 . The recess 84 communicates with the space above the holder main body 62 through the first insertion hole 61 . The convex portion 85 projects upward from the upper surface 81a of the coil support main body portion 81. The upper end 85a of the convex portion 85 is located above the upper surface 81a of the coil support main body portion 81 and the bottom surface 84a of the recessed portion 84. A bottom surface 84a of the recess 84 is located below the top surface 81a of the coil support body 81. That is, the bottom surface 84a of the recessed portion 84 is thinner than the coil support main body portion 81. The groove between the support portion 82 and the annular convex portion 85 constituting the recess 84 extends in a circumferential direction around the axis of the support portion 82 . The upper end 85a of the convex portion 85 is arranged inside the first insertion hole 61 in the axial direction. The upper end 85a of the convex portion 85 is preferably close to, and more preferably in contact with, the inner peripheral surface of the first insertion hole 61 in a direction intersecting the axial direction.

The coil support 80 has a fixing portion 86 extending from the coil support body 81 toward the upper holder body 62 side. The fixing part 86 is cylindrical. The fixing portion 86 passes through a fixing hole 623 (described later) of the holder main body portion 62 and is fixed thereto. The fixing part 86 includes a shaft part 86a that is inserted into the fixing hole 623, and a head part 86b that is located on one side of the fixing hole 623 in the axial direction and at least a part of which is located outside the fixing hole 623 when viewed from the axial direction. , has. In this embodiment, the head 86b is a heat-welded portion.

The end of the coil lead wire 41c inserted into the support part 82 of the coil support 80 and protruding upward from the first insertion hole 61 is electrically connected to the coil connection part 72, and is inserted into the holder body part 62, inside. The space between the wall portion 66 and the outer wall portion 67 is covered with adhesive R injected.

As shown in FIG. 2, the stator 30 of this embodiment is provided with two cover members 6A and 6B. The two cover members 6A and 6B sandwich the plurality of insulators 50 from above and below. One cover member 6A supports the inner surface 53c of the outer wall portion 53 above the plurality of insulators 50. Further, the lower cover member 6B supports the inner surface 53c of the outer wall portion 53 below the plurality of insulators 50. Since the two cover members 6A and 6B support the insulator 50 both above and below, movement of the insulator 50 inward in the radial direction can be stably suppressed.

Next, a procedure for assembling the stator 30 will be described based on FIG. 2.
First, the coil wire 41 is wound around the insulator 50 to provide the coil 40. Next, the insulator 50 is attached to the teeth portion 31b from the inside in the radial direction.

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 main body 62, and the boss 5 is heat caulked to provide a retaining portion 5b at the tip of the boss 5. Thereby, the lower cover member 6B is fixed to the insulator 50.

Next, the insulating paper 3 is inserted between the inner peripheral surface of the core back portion 31a and the outer wall portion 53 of the insulator 50 from above. Furthermore, the busbar 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 heat caulked to provide a retaining portion 5b at the tip of the boss 5. Thereby, the upper busbar unit 6 is fixed to the insulator 50.

According to this embodiment, the stator core 31, the coil 40, the bus bar 70, the bus bar holder 60, and the coil support 80 arranged between the coil 40 and the bus bar holder 60 in the axial direction are provided. The busbar 70 includes an annular busbar main body 71 and a coil connection part 72 that extends from the busbar main body 71 and is electrically connected to the coil lead wire 41c that is the end of the coil wire that constitutes the coil 40. . The busbar holder 60 includes a holder main body 62 that holds a busbar main body 71, and a first insertion hole 61 that passes through the holder main body 62 in the axial direction and into which the coil lead wire 41c is inserted. The coil support 80 includes a coil support main body part 81 that extends in a direction crossing the axial direction, a cylindrical support part 82 that extends upward from the coil support main body part 81, and a coil lead wire that penetrates the support part 82 in the axial direction. 41c is inserted into the second insertion hole 83, and a recess 84 recessed downward in the upper surface of the coil support body 81. On the upper side of the bus bar holder 60, the coil connecting portion 72 and the end of the coil lead wire 41c are covered with an adhesive R. Therefore, the coil lead wire 41c passes through the first insertion hole 61 of the holder main body in the axial direction and is electrically connected to the coil connecting portion 72 located above the holder main body 62. A coil support 80 is arranged on the lower side of the holder main body 62 at a position facing the first insertion hole 61 in the axial direction. Therefore, since the coil support 80 is provided with a recess 84 facing the first insertion hole 61 , the coil support 80 is injected into the upper side of the holder main body 62 on the upper side of the bus bar holder 60 when manufacturing the stator 30 , and is injected through the first insertion hole 61 . The adhesive R leaking downward can be received in the recess 84. Thereby, it is possible to suppress the adhesive R from leaking to the coil 40 side.

According to this embodiment, the recess 84 has an annular shape surrounding the support portion 82 . Thereby, the annular recess 84 can reliably receive the adhesive R flowing around the support portion 82 and flowing out from the first insertion hole 61 .

According to this embodiment, one axial end of the support portion 82 is arranged inside the first insertion hole 61 . Thereby, the adhesive R flowing into the first insertion hole 61 can be transmitted to the outer circumferential surface of the support part 82 of the coil support and can be reliably received in the recess 84.

According to this embodiment, the coil support 80 has a convex portion 85 that protrudes from the coil support main body portion 81 to one side in the axial direction. The concave portion 84 includes a convex portion 85 and a support portion 82. Thereby, the concave portion 84 can be provided by protruding the convex portion 85 on one side in the axial direction of the coil support body portion 81. Therefore, there is no need to increase the thickness of the coil support body 81 unlike in the case of the recess 84 in which the coil support body 81 is recessed, and the thickness of the coil support body 81 can be minimized, and the stator 30 The axial dimension of can be reduced.

According to this embodiment, one axial end of the convex portion 85 is arranged inside the first insertion hole 61 . Thereby, the adhesive R flowing into the first insertion hole 61 and flowing out along the inner peripheral surface of the first insertion hole 61 can be reliably received by the recess 84 located inside the first insertion hole 61. Further, by inserting the convex portion 85 into the first insertion hole 61, the coil support 80 can be easily positioned and assembled to the holder main body portion 62, so that assembly efficiency can be improved.

According to this embodiment, the inner circumferential surface of the first insertion hole 61 has a first tapered portion 61a whose diameter gradually decreases from the lower end toward the upper side. This makes it easier to insert the support portion 82 of the coil support 80 into the first insertion hole 61 from the other end in the axial direction, making assembly easier.

According to this embodiment, the first insertion hole 61 has the insertion cylinder portion 61b on one side in the axial direction of the first tapered portion 61a. One axial end of the support portion 82 is disposed inside the insertion cylinder portion 61b. Thereby, the adhesive R that has just flowed into the first insertion hole 61 can be transmitted to the outer circumferential surface of the support portion 82 and can be reliably received in the recess 84 .

According to this embodiment, at least a portion of the outer circumferential surface of the support portion 82 in the axial direction has a second tapered portion 82a whose diameter gradually decreases from the other side to the one side in the axial direction. As a result, since the outer peripheral surface of the support part 82 has the second tapered part 82a, it is easy to insert the support part 82 into the first insertion hole 61 when attaching the coil support 80 to the holder main body part 62, and assembly is facilitated. . Furthermore, the adhesive R that has flowed into the first insertion hole 61 can be transmitted to the second tapered portion 82a of the support portion 82 and can be reliably received in the recessed portion 84. Further, since the outer circumferential surface of the support portion 82 is tapered, molding is facilitated.

According to the present embodiment, the inner circumferential surface of the support portion 82 includes a first inner circumferential cylindrical surface 821 connected to the coil support body 81 and an inner circumferential tapered surface 822 provided above the first inner circumferential cylindrical surface 821. and a second inner circumferential cylindrical surface 823 provided above the inner circumferential tapered surface 822. Accordingly, since the inner circumferential surface of the support portion 82 has the inner circumferential tapered surface 822, the coil lead wire 41c is easily guided to the insertion inner circumferential surface and can be easily inserted. Moreover, since the first inner circumferential cylindrical surface 821 is narrow, the coil lead wire 41c can be held securely above the support portion 82.

According to this embodiment, the outer circumferential surface of the support portion 82 includes an outer circumferential cylindrical surface 824 connected to the coil support main body 81 and an outer circumferential tapered surface 825 provided on one side of the outer circumferential cylindrical surface 824 in the axial direction. Thereby, the adhesive R can be reliably transmitted on the outer circumferential tapered surface 825 of the support portion 82 and received in the recess 84 . Moreover, since the outer circumferential cylindrical surface 824 is a surface along the axial direction, the connection area of the support section 82 to the coil support main body section 81 can be kept small, and the volume of the recessed section 84 can be increased.

According to this embodiment, the stator 30 described above and the rotor 20 that faces the stator 30 in the radial direction and is rotatably supported are provided.
<Modified example>
Next, the configuration of the stator 30 according to a modified example will be described. FIG. 9 is a partial perspective view of a modified coil support 80A. The stator 30 of this modification differs in the configuration of the coil support 80A.
Components having the same aspects as those in the above-described embodiment are given the same reference numerals, and their explanations will be omitted.

As shown in FIG. 9, the coil support main body portion 81 of the coil support 80A of this modification is annular and coaxial with the bus bar holder 60. As shown in FIG. The recess 84A includes an inner peripheral wall 851 extending along the circumferential direction on the radially inner peripheral side of the coil support main body 81 and protruding to one side in the axial direction, and an inner peripheral wall 851 extending along the circumferential direction on the radially outer peripheral side of the coil support main body 81. It has an outer peripheral wall 852 that extends and projects to one side in the axial direction. The support portion 82 is provided in a region sandwiched between the inner peripheral wall 841 and the outer peripheral wall 842.

According to this modification, the adhesive R flowing out from the first insertion hole 61 along the periphery of the plurality of support parts 82 can be reliably received by the recess 84A extending in the circumferential direction. In this case, the entire region extending in the circumferential direction sandwiched between the inner peripheral wall 851 and the outer peripheral wall 852 becomes the recess 84, so that the volume of the recess 84 can be increased.

As another modification, the recess 84 includes an inner recess that extends along the circumferential direction on the inner radial side of the coil support main body 81 and is recessed toward the other side in the axial direction, and an inner recess that is recessed on the outer radial side of the coil support main body 81 in the radial direction. and an outer recess extending along the direction and recessed toward the other side in the axial direction. The support portion 82 is provided in a region sandwiched between the inner recess and the outer recess. As a result, the adhesive R flowing out from the first insertion hole 61 along the circumference of the plurality of support parts 82 is reliably transferred by the recesses 84 on both sides in the radial direction sandwiching the support part 82 between the inner and outer recesses extending in the circumferential direction. Can receive. In this case, since the inner recess and the outer recess have a groove shape extending in the circumferential direction, the volume of the recess 84 can be increased.

The embodiments of the present invention and their modifications have been described above, but each configuration and combination thereof in the embodiments and modifications are merely examples, and additions of configurations and modifications may be made without departing from the spirit of the present invention. Omissions, substitutions and other changes are possible. Moreover, the present invention is not limited by the embodiments.

For example, in the above-described embodiment, a motor mounted on a compressor has been described, but a similar configuration may be adopted for a motor mounted on a water pump or an oil pump.

5... Boss, 10... Motor, 11... Housing, 20... Rotor, 30... Stator, 31... Stator core, 31a... Core back part, 31b... Teeth part, 40... Coil, 41... Coil wire, 41c... Coil leader wire, 50... Insulator, 53... Outer wall part (wall part), 53d... Insulator slope, 54... Inner wall part, 6... Bus bar unit, 6A, 6B... Cover member, 60... Bus bar holder, 61... First insertion hole, 62...Holder body part, 62b...Flange part, 621...Holder slope, 623...Fixing hole, 64...Flange hole, 66...Inner wall part, 67...Outer wall part, 70...Bus bar, 71...Bus bar body part, 72 ...Coil connection part, 80...Coil support, 81...Coil support main body part, 82...Support part, 83...Second insertion hole, 84...Recessed part, 85...Convex part, CL...Center line, J...Center axis line

Claims (13)

A stator core, a coil, a busbar, a busbar holder, and a coil support disposed between the coil and the busbar holder in the axial direction,
The bus bar includes an annular bus bar main body, and a coil connection part that extends from the bus bar main body and is electrically connected to a coil lead wire that is an end of a coil wire that constitutes the coil,
The bus bar holder is
a holder body that holds the busbar body;
a first insertion hole passing through the holder main body in the axial direction and into which the coil lead wire is inserted;
Equipped with
The coil support is
A coil support main body section that extends in a direction that intersects with the axial direction;
a cylindrical support portion extending from the coil support main body portion to one side in the axial direction;
a second insertion hole that passes through the support portion in the axial direction and into which the coil lead wire is inserted;
a recessed portion recessed toward the other axial side on one axial side surface of the coil support main body;
has
On one axial side of the bus bar holder, the coil connecting portion and the end of the coil leader wire are covered with an adhesive.
stator. The recessed portion is annular surrounding the support portion,
A stator according to claim 1. The coil support main body has an annular shape coaxial with the bus bar holder,
The recess is
an inner peripheral wall extending along the circumferential direction on the radially inner peripheral side of the coil support main body and projecting to one side in the axial direction;
an outer peripheral wall extending along the circumferential direction on the radially outer peripheral side of the coil support main body and projecting to one side in the axial direction;
has
The support portion is provided in a region sandwiched between the inner circumferential wall and the outer circumferential wall,
A stator according to claim 1. The coil support main body has an annular shape coaxial with the bus bar holder,
The recess is
an inner recess that extends along the circumferential direction on the radially inner circumferential side of the coil support main body and is recessed toward the other axial side;
an outer recessed portion extending along the circumferential direction on the radially outer peripheral side of the coil support main body portion and recessed toward the other side in the axial direction;
has
The support portion is provided in a region sandwiched between the inner recess and the outer recess.
A stator according to claim 1. One axial end of the support portion is disposed inside the first insertion hole.
A stator according to any one of claims 1 to 4. The coil support has a convex portion that protrudes from the coil support main body to one side in the axial direction,
The recessed portion includes the protrusion and the support portion,
A stator according to claim 1. One axial end of the convex portion is disposed inside the first insertion hole,
A stator according to claim 6. The inner circumferential surface of the first insertion hole has a first tapered portion whose diameter gradually decreases from the other axial end toward the one axial side.
A stator according to any one of claims 1 to 7. The first insertion hole has an insertion cylinder part on one side in the axial direction of the first tapered part,
One axial end of the support portion is disposed inside the insertion cylinder portion;
A stator according to claim 8. At least a portion of the outer circumferential surface of the support portion in the axial direction has a second tapered portion whose diameter gradually decreases from the other side to the one side in the axial direction.
A stator according to any one of claims 1 to 9. The inner circumferential surface of the support portion is
a first inner cylindrical surface connected to the coil support main body;
an inner circumferential tapered surface provided on one side in the axial direction of the first inner circumferential cylindrical surface;
a second inner circumferential cylindrical surface provided on one side in the axial direction of the inner circumferential tapered surface;
has,
A stator according to any one of claims 1 to 10. The outer peripheral surface of the support portion is
an outer cylindrical surface connected to the coil support main body;
an outer circumferential tapered surface provided on one side in the axial direction of the outer circumferential cylindrical surface;
has,
A stator according to any one of claims 1 to 11. A stator according to any one of claims 1 to 12,
a rotor radially opposed to the stator and rotatably supported;
motor.

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