Stator and motor

Abstract

The present application provides a stator and a motor. The stator has: a stator core having a ring-shaped core back portion centered on a center axis and a plurality of tooth portions extending from the core back portion to a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from a radially inner side; coils respectively wound on the insulating members; and a cover member supporting inner side surfaces of the insulating members toward the radially inner side from the radially inner side.

Description

TECHNICAL FIELD

[0001] The present application relates to a stator and a motor. BACKGROUND

[0002] In order to improve the space factor of the winding, a stator manufactured by embedding an insulating member in which a coil is wound into a tooth is known. In the stator described in Patent Document 1, in order to prevent the bobbin (insulating member) from falling off, a configuration using an adhesive is disclosed.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-184514

[0004] In the case where the tooth and the insulating member are adhesively fixed, there is a problem that it is difficult to obtain a stable fixing force due to a variation in the amount of injection of the adhesive or deterioration of the adhesive due to the use environment. SUMMARY

[0005] In view of the above, one object of the present application is to provide a stator and a motor in which an insulating member is stably fixed to a tooth.

[0006] One embodiment of the present application is a stator including: a stator core having a ring-shaped core back portion centered on a center axis and a plurality of tooth portions extending from the core back portion toward a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from the radially inner side; coils respectively wound around the insulating members; and a cover member supporting inner side surfaces of the insulating members toward the radially inner side from the radially inner side.

[0007] One embodiment of the present application is a stator including: a stator core having a ring-shaped core back portion centered on a center axis and a plurality of tooth portions extending from the core back portion toward a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from the radially inner side; coils respectively wound around the insulating members; and a cover member respectively fixed to the insulating members. The insulating member has a boss protruding toward the cover member. The cover member is provided with a fixing hole into which the boss is inserted.

[0008] One embodiment of the present application is a motor including: the above-described stator; a rotor opposed to the stator in the radial direction; and a housing accommodating the stator and the rotor.

[0009] According to one embodiment of the present application, it is possible to provide a stator and a motor in which an insulating member is stably fixed to a tooth. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 FIG. 1 is a cross-sectional schematic view of a motor of one embodiment.

[0011] Figure 2FIG. 1 is an exploded perspective view of a stator of one embodiment.

[0012] Figure 3 FIG. 2 is a plan view of the stator of one embodiment.

[0013] Figure 4 FIG. 3 is a partial cross-sectional view of the stator of one embodiment.

[0014] Figure 5 FIG. 4 is a perspective view of a portion of the stator of one embodiment.

[0015] Figure 6 FIG. 5 is a partial cross-sectional view of the stator of one embodiment.

[0016] Figure 7 FIG. 6 is a plan view schematically showing a stator of Modification 1.

[0017] Figure 8 FIG. 7 is a plan view schematically showing a stator of Modification 2.

[0018] Figure 9 FIG. 8 is a schematic view of a compressor provided with the motor of one embodiment.

[0019] BRIEF DESCRIPTION OF NUMERALS

[0020] 3: Insulating paper; 4: Fixing hole; 5: Boss; 5a: Anti-coming-off portion; 7: Binding tape; 10: Motor; 11: Housing; 20: Rotor; 30, 130, 230: Stator; 31: Stator core; 31a: Core back; 31b: Tooth portion; 40: Coil; 40c: Lapped wire; 41: Coil wire; 50: Insulating member; 53: Outer side wall portion (wall portion); 53a: Inner side surface; 60, 160, 260: Cover member; 61, 62: Protruding rib (protrusion); 63: Groove; 65, 165, 265: Cover main body portion; 65a, 163a: Outer edge; 65f: Opposed surface; 66: Concave portion; 67: Accommodating concave portion; 68, 69: Rib; CL: Center line; J: Center axis; S: Slot. DETAILED DESCRIPTION

[0021] Hereinafter, an embodiment of the motor 10 and the stator 30 will be described with reference to the drawings.

[0022] In the following description, the axis direction of the center axis J of the motor 10 will be simply referred to as the "axial direction", the radial direction centered on the center axis J will be simply referred to as the "radial direction", and the circumferential direction centered on the center axis J will be simply referred to as the "circumferential direction".

[0023] Also, in the following description, the positional relationship of the respective parts of the motor 10 and the stator 30 is described with the one axial side as the upper side and the other axial side as the lower side. However, the posture of the motor 10 and the stator 30 at the time of actual use is not limited to the up-down direction described in this specification.

[0024] Figure 1 is a cross-sectional view of the motor 10 of the present embodiment. Figure 2 is an exploded perspective view of the stator 30 of the present embodiment. Figure 3 is a plan view of the stator 30.

[0025] As shown in Figure 1 , the motor 10 of the present embodiment has a rotor 20 centered on a center 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. The motor 10 of the present embodiment is an internal rotor type motor. The rotor 20 rotates about the center axis J.

[0026] 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 holding wall portion 11d. The cylindrical portion 11a is in a cylindrical shape extending along the center axis J. The bearing holding wall portion 11d covers the opening on the one axial side of the cylindrical portion 11a. The bearing holding wall portion 11d is fixed to the inner peripheral surface of the cylindrical portion 11a. The bearing holding wall portion 11d holds the bearings 15. The bottom wall portion 11c covers the opening on the other axial side of the cylindrical portion 11a. The bottom wall portion 11c holds the bearings 16.

[0027] A refrigerant flows inside the housing 11. A refrigerant inflow port 11p and a refrigerant outflow port 11q are provided in the cylindrical portion 11a. The refrigerant inflow port 11p and the refrigerant outflow port 11q are arranged in the axial direction. The refrigerant inflow port 11p is located on the one axial side with respect to the stator 30, and the refrigerant outflow port 11q is located on the other axial side with respect to the stator 30. The refrigerant flows inside the housing 11 from the one axial side toward the other axial side of the stator 30 through the grooves S of the stator 30.

[0028] The rotor 20 opposes the stator 30 in the radial direction. The rotor 20 of the present embodiment is disposed on the radially inner side of the stator 30. The rotor 20 has a shaft 21, a rotor core 22, and a magnet 23. The shaft 21 is in a cylindrical shape extending in the axial direction. Also, the shaft 21 can be in a cylindrical shape extending in the axial direction. The shaft 21 is supported by the plurality of bearings 15, 16 so as to be rotatable about the center axis J. The plurality of bearings 15, 16 are arranged at intervals 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 the plurality of bearings 15, 16.

[0029] The rotor core 22 is in a cylindrical shape extending in the axial direction. The outer diameter of the rotor core 22 is larger than the outer diameter of the shaft 21. The axial length of the rotor core 22 is shorter than the axial length of 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, adhesion, or the like. The rotor core 22 is located between the pair of bearings 15, 16 in the axial direction. The magnet 23 is fixed to the outer peripheral portion of the rotor core 22.

[0030] The stator 30 opposes the rotor 20 with a gap in the radial direction. The stator 30 surrounds the rotor 20 in the entire circumferential range from the radially outer side. The stator 30 has a stator core 31, a plurality of insulating members 50, two cover members 60, a plurality of coils 40, a plurality of covering portions 42, and a plurality of insulating papers 3.

[0031] The stator core 31 surrounds the rotor 20 from the radially outer side. The stator core 31 is composed of, for example, a plurality of electromagnetic steel sheets stacked in the axial direction. The stator core 31 is fixed to the inner peripheral surface of the housing 11. The fixing of the stator core 31 to the housing 11 is performed by, for example, thermal press-fitting, press-fitting, or the like.

[0032] The stator core 31 has a core back portion 31a and a plurality of tooth portions 31b. The core back portion 31a is in a ring shape centered on the center axis J. The outer peripheral surface of the core back portion 31a toward the radially outer side is fixed to the inner peripheral surface of the cylindrical portion 11a.

[0033] The tooth portions 31b extend toward the radially inner side from the core back portion 31a. The plurality of tooth portions 31b are arranged along the circumferential direction. The plurality of tooth portions 31b are disposed at intervals from each other along the circumferential direction. The slots S (refer to FIG. 6) are provided between the adjacent tooth portions 31b along the circumferential direction. Figure 3 The radially inner side surface of each tooth portion 31b opposes the radially outer side surface of the rotor 20 with a gap therebetween.

[0034] The plurality of insulating members 50 are respectively mounted to the plurality of tooth portions 31b from the radially inner side. The insulating member 50 is an insulating member that insulates the coil 40 from the tooth portion 31b. The insulating member 50 is, for example, resin-made.

[0035] The insulating member 50 has an insulating member main body portion 51, an outer side wall portion (wall portion) 53, and an inner side wall portion 54.

[0036] The insulating member main body portion 51 is in a square tube shape extending in the radial direction. The through hole 51h penetrating in the radial direction is provided in the insulating member main body portion 51. The tooth portion 31b is inserted into the through hole 51h. Thus, the insulating member main body portion 51 surrounds the tooth portion 31b.

[0037] The inner side wall portion 54 extends from the end portion of the insulating member main body portion 51 on the radially inner side in a direction perpendicular to the radial direction. Similarly, the outer side wall portion 53 extends from the end portion of the insulating member main body portion 51 on the radially outer side in the axial direction.

[0038] As Figure 3 shown, the inner side wall portion 54 and the outer side wall portion 53 are plate-shaped extending in a plate surface curved along the circumferential direction. That is, the inner side wall portion 54 and the outer side wall portion 53 extend along the circumferential direction. The inner side wall portions 54 and the outer side wall portions 53 of the plurality of insulating members 50 are respectively arranged in a ring shape along the circumferential direction.

[0039] As Figure 2 shown, the outer side wall portion 53 is provided with a notch portion 53c extending from the upper end edge to the lower side. The notch portion 53c is located at the circumferential center of the outer side wall portion 53. The notch portion 53c has a bottom surface 53b toward the upper side. The boss 5 that fixes the cover member 60 is provided on the bottom surface 53b. That is, the insulating member 50 has the boss 5. The boss 5 protrudes toward the cover member 60 located at the upper side of the insulating member 50. The boss 5 extends from the bottom surface 53b to the upper side. In addition, here, the boss 5 of the upper insulating member 50A of the two insulating members 50A, 50B to be described later is described, but the boss of the lower insulating member 50B also has the same structure.

[0040] On the stator 30 of the present embodiment, 12 insulating members 50 are provided. The 12 insulating members 50 are classified into 6 first insulating members 50A and 6 second insulating members 50B. The first insulating members 50A and the second insulating members 50B are alternately arranged in the circumferential direction. Therefore, the first insulating members 50A and the second insulating members 50B are adjacent to each other in the circumferential direction.

[0041] The first insulating members 50A and the second insulating members 50B mainly differ in the shape of the outer side wall portion 53. Here, the outer side wall portion 53 of the first insulating member 50A is referred to as a first outer side wall portion 53A, and the outer side wall portion 53 of the second insulating member 50B is referred to as a second outer side wall portion 53B.

[0042] The second outer side wall portion 53B has a pair of arm portions 55 extending to both sides in the circumferential direction. On the other hand, arm-receiving recesses 56 recessed to the radially inner side are provided at both ends in the circumferential direction of the outer circumferential surface of the first outer side wall portion 53A. The front ends of the arm portions 55 of the second outer side wall portion 53B are arranged in the arm-receiving recesses 56 of the first outer side wall portion 53A. Thereby, the inner circumferential surface of the arm portion 55 contacts the outer circumferential surface of the insulating member (first insulating member 50A) adjacent in the circumferential direction toward the radially outer side. By the arm portion 55 being arranged to the radially outer side of the first insulating member 50A, the movement of the second insulating member 50B to the radially inner side is restricted by the first insulating member 50A.

[0043] As Figure 1As shown, the coil 40 is composed of the coil wire 41 wound in multiple layers. The plurality of coils 40 are each wound to the insulating member 50. The coil 40 is positioned between the radial direction of the inner side wall portion 54 and the outer side wall portion 53. 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 suppress the coil 40 from separating from the insulating member 50 in the radial direction.

[0044] The coils 40 of a part of the plurality of coils 40 are connected to each other via the lap wire 40c. The lap wire 40c is positioned on the upper side of the coil 40. The lap wire 40c extends in the circumferential direction between the coils 40. That is, the plurality of coils 40 are connected to each other by the lap wire 40c extending in the circumferential direction on the upper side of the coil 40. The lap wire 40c is insulated from other lap wires 40c, for example, by being covered with a heat shrink tube.

[0045] As shown, the coil 40 is composed of the coil wire 41 wound in multiple layers. The plurality of coils 40 are each wound to the insulating member 50. The coil 40 is positioned between the radial direction of the inner side wall portion 54 and the outer side wall portion 53. 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 suppress the coil 40 from separating from the insulating member 50 in the radial direction. Figure 3

[0046] As shown, the coil 40 is composed of the coil wire 41 wound in multiple layers. The plurality of coils 40 are each wound to the insulating member 50. The coil 40 is positioned between the radial direction of the inner side wall portion 54 and the outer side wall portion 53. 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 suppress the coil 40 from separating from the insulating member 50 in the radial direction.

[0047] As shown, the coil 40 is composed of the coil wire 41 wound in multiple layers. The plurality of coils 40 are each wound to the insulating member 50. The coil 40 is positioned between the radial direction of the inner side wall portion 54 and the outer side wall portion 53. 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 suppress the coil 40 from separating from the insulating member 50 in the radial direction.

[0048] Here, the "number of turns of coil wire" with respect to the first coil 40A and the second coil 40B means the number of turns (i.e., the number of layers) of the coil 40 locally at a specific position in the radial direction, and does not mean the total number of turns of the entire coil (the entire area from the radial inner side to the radial outer side).

[0049] ​In addition, the total number of turns of the coil wire 41 of the first coil 40A and the total number of turns of the coil wire 41 of the second coil 40B are equal to each other. In addition, the coil wire 41 constituting the first coil 40A and the second coil 40B is the same kind of coil wire as each other. Therefore, the magnetic flux density of the magnetic field formed by the first coil 40A and the magnetic flux density of the magnetic field formed by the second coil 40B are substantially equal to each other.

[0050] The cover portion 42 covers the outer peripheral surface of the first coil 40A. Therefore, the circumferential both end surfaces and the axial both end surfaces of the first coil 40A are covered by the cover portion 42. On the other hand, the cover portion is not provided on the outer peripheral surface of the second coil 40B. Therefore, the circumferential both end surfaces of the second coil 40B are exposed on the side of the slot S.

[0051] The cover portion 42 is constituted by an insulating material. The cover portion 42 of the present embodiment is, for example, an insulating heat shrink tube. The cover portion 42 is in a tubular shape extending in the radial direction. The cover portion 42 is fitted to the outer peripheral surface of the first coil 40A without a gap by covering the first coil 40A before shrinkage and being heated. The cover portion 42 is deformed in a wavy shape along the outer peripheral surface of the first coil 40A by shrinkage and thereby covers the outer peripheral surface of the first coil 40A.

[0052] In the slot S, the circumferential end surface of the first coil 40A is covered by the cover portion 42 and the circumferential end surface of the second coil 40B is exposed on the side of the slot S. Therefore, in the slot S, the insulating cover portion 42 is arranged between the circumferential end surface of the first coil 40A and the circumferential end surface of the second coil 40B. The cover portion 42 insulates the first coil 40A and the second coil 40B from each other.

[0053] In addition, in the present specification, the circumferential end surface refers to an end surface facing the circumferential direction.

[0054] According to the present embodiment, by providing the cover portion 42 only on the circumferential end surface of one of the two coils 40 facing each other in the circumferential direction within the slot S, the insulation of the two coils 40 can be ensured. According to the present embodiment, the number of uses of the cover portion 42 can be reduced, thereby the component cost can be reduced, and the process of molding the cover portion 42 can be reduced, thereby the reduction of the manufacturing cost of the stator 30 can be achieved.

[0055] The coil 40 is installed together with the insulating member 50 in the state of being wound around the insulating member 50 in the tooth portion 31b. In the present embodiment, the first coil 40A and the first insulating member 50A are installed in the tooth portion 31b after all of the second coil 40B and the second insulating member 50B are installed in the tooth portion 31b.

[0056] As Figure 2As shown, multiple insulating sheets 3 are arranged circumferentially. The insulating sheets 3 are arranged radially along the inner surface (inner circumferential surface) of the back of the iron core 31a with the thickness direction in the radial direction. The insulating sheets 3 are rectangular in shape with the axial direction in the length direction.

[0057] The insulating paper 3 is disposed between adjacent teeth 31b in the circumferential direction. A portion of the circumferential ends of the insulating paper 3 is radially covered from the outer side by the outer wall portion 53 of the adjacent circumferential insulating members 50 (first insulating member 50A and second insulating member 50B). Thus, the insulating paper 3 is clamped between the inner circumferential surface of the iron core back 31a and the outer wall portion 53, restricting its radial movement. The insulating paper 3 is inserted from above between the inner circumferential surface of the iron core back 31a and the outer wall portion 53.

[0058] The insulating paper 3 is disposed in the gap between the outer wall portions 53 of adjacent circumferentially adjacent insulating members 50. As a result, the surface distance between the coil 40 wound on the insulating member 50 and the back surface 31a of the iron core can be increased, thereby ensuring the insulation between the coil 40 and the back surface 31a of the iron core.

[0059] Next, the cover member 60 will be described in detail. In addition, the upper cover member 60 of the two cover members 60 will be described here, but the lower cover member 60 also has the same structure.

[0060] The cover component 60 has a cover body 65 and a plurality of fixing plates 64 fixed to the insulating member 50. The cover body 65 is in the shape of a circular plate centered on the central axis J and along a plane perpendicular to the central axis J.

[0061] like Figure 1 As shown, the cover body 65 is located above the coil 40 (on one axial side) and below the lap joint 40c (on the other axial side). The cover body 65 divides the area where the coil 40 is disposed and the area where the lap joint 40c is disposed. The cover body 65 ensures insulation between the coil 40 and the lap joint 40c.

[0062] In addition, Figure 3 The diagram of the overlapping line 40c located on the upper side of the cover body 65 is omitted.

[0063] like Figure 3 As shown, the cover body 65 extends circumferentially between the outer side wall 53 and the inner side wall 54. Here, the radially inward-facing surface of the outer side wall 53 is referred to as the inner surface 53a. That is, the insulating member 50 has an inner surface 53a facing radially inward. The cover body 65 contacts the inner surface 53a from the radially inward side. As a result, the cover member 60 supports the inner surface 53a from the radially inward side, inhibiting the insulating member 50 from moving radially inward.

[0064] When current is supplied to the stator 30, a magnetic pole is generated on the coil 40, and a magnetic force toward the radial direction is applied to the coil 40 and the insulator 50 in which the coil 40 is wound. The insulator 50 of the present embodiment is attached to the tooth portion 31b from the radial inner side. Therefore, when a force toward the radial inner side is applied to the coil 40 and the insulator 50, the insulator 50 can be detached from the tooth portion 31b. According to the present embodiment, the cover member 60 can fix the insulator 50 to the stator core 31 by restricting the movement of the insulator 50 toward the radial inner side. Thus, the insulator 50 can be prevented from interfering with the rotor 20, and the reliability of the motor 10 can be improved.

[0065] In addition, in the present embodiment, the insulator 50 in which the inner side surface 53a toward the radial inner side is provided to the outer side wall portion 53 is described. However, the inner side surface 53a that contacts the cover member 60 can be a surface toward the radial inner side provided to another portion of the insulator 50.

[0066] According to the present embodiment, the outer side wall portions 53 of the plurality of insulators 50 are arranged in a ring shape along the circumferential direction, and the cover member 60 is embedded in the inner side of the plurality of outer side wall portions 53. Therefore, the insulators 50 located on the opposite sides across the center axis J are arranged to be separated from each other by the cover member 60, and respectively sandwich the cover member to restrict the movement toward the radial direction. That is, according to the present embodiment, the cover member 60 is not easily moved in either direction in a plane perpendicular to the center axis J, and thus the stability of the movement restriction of the insulator 50 can be improved.

[0067] In the present embodiment, the cover member 60 contacts the inner side surface 53a of all the insulators 50. However, the cover member 60 of the present embodiment can contact only the inner side surface 53a of the first insulator 50A. The inner peripheral surface of the arm portion 55 of the second insulator 50B of the present embodiment contacts the outer peripheral surface of the first insulator 50A toward the radial outer side in the circumferential direction. That is, a part (the arm portion 55) of the second insulator 50B is arranged at a position radially outward of the outer peripheral surface of the first insulator 50A, and contacts the outer peripheral surface from the radial outer side. Therefore, the second insulator 50B is restricted from moving toward the radial inner side by the first insulator 50A. The cover member 60 can restrict the movement of the second insulator 50B toward the radial direction via the first insulator 50A even if the cover member 60 supports only the first insulator 50A from the radial inner side.

[0068] As Figure 2As shown, two cover members 60 are provided on the stator 30 of the present embodiment. The two cover members 60 of the present embodiment are identical in shape. The two cover members 60 sandwich the plurality of insulating members 50 from the upper and lower directions. One cover member 60 supports the inner side surface 53a of the outer side wall portion 53 on the upper side (one axial side) of the plurality of insulating members 50. The other cover member 60 supports the inner side surface 53a of the outer side wall portion 53 on the lower side (the other axial side) of the plurality of insulating members 50. Since the two cover members 60 support the insulating members 50 on both the upper and lower sides, the movement of the insulating members 50 to the radially inner side can be stably suppressed.

[0069] Figure 4 is a partial cross-sectional view of the stator 30 taken perpendicular to the center axis J. An opposing surface 65f facing the radially outer side and opposing the inner side surface 53a of the outer side wall portion 53 is provided on the outer edge 65a of the cover main body portion 65 on the radially outer side. That is, the cover member 60 has the opposing surface 65f. A plurality of protruding ribs (protrusions) 61, 62 are provided on the opposing surface 65f.

[0070] The protruding ribs 61, 62 protrude toward the radially outer side. The protruding ribs 61, 62 extend along the axial direction. The plurality of protruding ribs 61, 62 are arranged along the circumferential direction. The front ends of the protruding directions of the protruding ribs 61, 62 are in contact with the inner side surface 53a of the outer side wall portion 53. That is, the protruding ribs 61, 62 are in contact with the inner side surface 53a at the front ends.

[0071] According to the present embodiment, the cover member 60 is in contact with the insulating member 50 at the front ends of the protruding ribs 61, 62. Therefore, by managing the dimensions of the protruding heights of the protruding ribs 61, 62, the press-in allowance of the cover member 60 to the inner side of the plurality of insulating members 50 can be easily adjusted. In addition, the reliability of the contact of the cover member 60 with the insulating member 50 can be improved. Thus, all of the insulating members 50 can be brought into contact with the cover member 60 without any play.

[0072] The plurality of protruding ribs 61, 62 are classified into first protruding ribs 61 and second protruding ribs 62 that are alternately arranged along the circumferential direction. The first protruding ribs 61 and the second protruding ribs 62 are in contact with the inner side surface 53a of one insulating member 50. The first protruding ribs 61 and the second protruding ribs are located on the circumferential one side and the circumferential other side with respect to the center line CL of one tooth portion 31b. That is, when viewed in the axial direction, the inner side surface 53a of one insulating member 50 is in contact with the first protruding rib 61 located on the circumferential one side of the center line CL of the tooth portion 31b and the second protruding rib 62 located on the circumferential other side of the center line CL of the tooth portion 31b, respectively. Therefore, the cover member 60 can stably suppress the movement of the insulating member 50 to the radially inner side along the center line CL of the tooth portion 31b.

[0073] A recess 66 is provided on the outer edge 65a of the cover body 65, recessed radially inward. The recess 66 is arranged adjacent to the fixing piece 64 of the insulating member 50 in the circumferential direction. The coil wire 41 extending from the coil 40 passes through the recess 66. The coil wire 41 extending from the coil 40 can be a connecting wire 40c that connects the coils 40 to each other, or it can be a connecting wire that connects to an external power source that supplies power to the stator 30.

[0074] According to this embodiment, the coil wire 41 led out from the coil 40 passes through the recess 66, thus allowing the coil wire 41 to pass between the cover body portion 65 and the outer wall portion 53. Therefore, compared to the case where the coil wire 41 is routed by detouring to the outside of the outer wall portion 53, the coil wire 41 can be shortened, thereby suppressing the radial enlargement of the stator 30.

[0075] A recessed receiving portion 67 is provided on the outer edge of the lower surface of the cover body 65, extending upwards. In this embodiment, the number of receiving recesses 67 is the same as the number of teeth 31b. The receiving recesses 67 are located between adjacent teeth 31b in the circumferential direction. The upper end of the insulating paper 3 is received in the receiving recesses 67. Furthermore, as described later, a receiving recess 67 for receiving the insulating paper 3 is also provided on the cover member mounted from below to the insulating member 50. Therefore, the lower end of the insulating paper 3 is received in the receiving recess 67 provided on the cover member mounted from below. Thus, the receiving recess 67 suppresses misalignment of the insulating paper 3. If the insulating paper 3 is misaligned, the distance between the inner circumferential surface of the iron core back 31a and the edge surface of the coil 40 becomes shorter, and the insulation performance may decrease. According to this embodiment, by receiving the insulating paper 3 in the receiving recesses 67, the insulation performance of the stator 30 can be improved.

[0076] Figure 5 This is a perspective view of the stator 30 near the boundary of the two outer sidewall portions 53. Figure 5 In, it is shown that in Figure 4 The stator 30 is located in the area near the boundary between the first insulator 50A and the second insulator 50B, enclosed by a single-dotted line. Figure 5 In the middle, a portion of the cover component 60 is shown in cross-section.

[0077] As described above, one of the pair of outer sidewall portions 53 of the circumferentially adjacent insulating members 50 (first insulating member 50A and second insulating member 50B) is the first outer sidewall portion 53A, and the other is the second outer sidewall portion 53B. The arm portion 55 of the second outer sidewall portion 53B extends toward the circumferentially adjacent first outer sidewall portion 53A. The arm portion 55 is positioned above the cover member 60. An upper notch portion 57 with an upper opening is provided at the upper end of the arm portion 55. Similarly, a lower notch portion 58 with a lower opening is provided at the lower end of the arm portion 55.

[0078] The bundling tape 7 is wound on the upper side notch portion 57 and the lower side notch portion 58. In addition, the bundling tape 7 bundles a plurality of the lap wires. Thereby, it is possible to fix the plurality of the lap wires 40c to the insulating member 50.

[0079] A plurality of ribs 68, 69 are arranged along the circumferential direction on the upper surface (a surface facing the axial direction) of the cover main portion 65. The ribs 68, 69 protrude toward the upper side (the axial direction). The protrusion heights of the plurality of ribs 68, 69 are uniform with each other. The ribs 68, 69 extend along the radial direction. The ribs 68, 69 are provided over the entire width in the radial direction of the cover main portion 65. The ribs 68, 69 increase the rigidity of the cover main portion 65 in the radial direction, and suppress deformation of the cover member 60 in a case where a force is applied to the cover member 60 from the insulating member 50.

[0080] The lap wire 40c before being bundled by the bundling tape 7 contacts the upper end surfaces of the ribs 68, 69. Thereby, a gap corresponding to the protrusion heights of the ribs 68, 69 is provided between the lap wire 40c and the upper surface of the cover main portion 65. According to the present embodiment, when the lap wires 40c are gathered by the bundling tape 7, it is possible to easily pass the one end of the bundling tape 7 through the gap between the lap wire 40c and the upper surface of the cover main portion 65, and thereby it is possible to improve the workability of the bundling process.

[0081] The plurality of ribs 68, 69 have first ribs 68 and second ribs 69 alternately arranged along the circumferential direction. When viewed in the radial direction, the first ribs 68 and the second ribs 69 are arranged with a prescribed gap therebetween in the circumferential direction. In a case where the upper end surfaces of the first ribs 68 and the second ribs 69 are viewed as a reference, a groove 63 extending along the radial direction is provided between the first ribs 68 and the second ribs 69. That is, the groove 63 is provided on the upper surface (a surface facing the axial direction) of the cover main portion 65.

[0082] The groove 63 is recessed toward the lower side. The groove 63 is provided over the entire width in the radial direction of the cover main portion 65. Therefore, the groove 63 is open on the inner side and the outer side in the radial direction of the cover main portion 65. The circumferential position of the groove 63 coincides with the circumferential positions of the upper side notch portion 57 and the lower side notch portion 58 of the outer side wall portion 53. Therefore, the circumferential position of the bundling tape 7 wound on the upper side notch portion 57 and the lower side notch portion 58 coincides with the circumferential position of the groove 63.

[0083] According to the present embodiment, when the lap wires 40c are gathered by the bundling tape 7, by passing the one end of the bundling tape 7 into the groove 63, it is possible to arrange the bundling tape 7 on the lower side of the lap wire 40c, and thereby it is possible to improve the workability of the bundling process. In addition, the work of bundling the lap wires 40c by the bundling tape 7 can also be performed using an assembly device or the like. In this case, by passing the one end of the bundling tape 7 into the groove 63 using a nozzle of the assembly device, it is possible to stably perform the bundling process of the bundling tape 7.

[0084] Furthermore, in this embodiment, the valley between the first rib 68 and the second rib 69 is described as functioning as a groove 63. However, even if the groove 63 is directly provided on a flat surface, the above-mentioned effect produced by providing the groove 63 can be obtained.

[0085] like Figure 3 As shown, a plurality of fixing pieces 64 of the cover member 60 protrude outward from the outer edge 65a of the cover body portion 65. The plurality of fixing pieces 64 are arranged at equal intervals along the circumferential direction. The fixing pieces 64 are plate-shaped with the axial direction as the thickness direction. In this embodiment, the cover member 60 is provided with the same number of fixing pieces 64 as the insulating member 50 (i.e., 12). The fixing pieces 64 are disposed inside the notch portion 53c provided in the outer side wall portion 53 of the insulating member 50.

[0086] Figure 6 This is a partial sectional view of the stator 30 through the fixing plate 64.

[0087] The lower surface of the fixing piece 64 contacts the bottom surface 53b of the notch 53c of the insulating member 50. A fixing hole 4 extending through the thickness direction is provided in the fixing piece 64. Furthermore, a boss 5 provided on the insulating member 50 is inserted into the fixing hole 4.

[0088] The boss 5 has a cylindrical column portion 5b and an anti-detachment portion 5a located at the front end of the column portion 5b. That is, the anti-detachment portion 5a is provided at the front end of the boss 5. The outer diameter of the column portion 5b is smaller than the inner diameter of the fixing hole 4. The column portion 5b of the boss 5 passes through the fixing hole 4. By heat-pressing the front end of the boss 5, the anti-detachment portion 5a is formed into a roughly circular shape when viewed axially. In addition, the outer diameter of the anti-detachment portion 5a is larger than the inner diameter of the fixing hole 4. The anti-detachment portion 5a contacts the upper surface of the fixing piece 64. Thus, the cover member 60 is fixed to the insulating member 50. Alternatively, the anti-detachment portion 5a may not be circular when viewed axially. That is, as long as at least a portion of the outer edge of the anti-detachment portion 5a is larger than the inner diameter of the fixing hole 4 when viewed axially.

[0089] According to this embodiment, since the cover member 60 is fixed to the insulating member 50, it is possible to suppress the upward movement of the cover member 60 relative to the plurality of insulating members 50. Therefore, the movement suppression of the cover member 60 relative to the insulating member 50 can be performed more stably, thereby improving the reliability of the stator 30.

[0090] In addition, in this embodiment, the structure in which an anti-detachment part 5a is provided at the front end of the boss 5 has been described. However, by making the outer diameter of the column part 5b and the inner diameter of the fixing hole 4 a fitting size, the boss 5 and the fixing hole 4 can be fixed without providing the anti-detachment part 5a.

[0091] In the present embodiment, the bosses 5 are provided on all of the insulating members 50, and all of the bosses 5 are inserted into the fixing holes 4 of the cover member 60. Thus, the fixation of the cover member 60 is stable. However, if the cover member 60 is fixed to at least one of the insulating members 50, the cover member 60 is inhibited from moving upward, and thus the cover member 60 is inhibited from being detached with respect to the plurality of insulating members 50. Therefore, in the present embodiment, the cover member 60 is fixed to at least one of the insulating members 50.

[0092] The cover member 60 of the present embodiment supports the inner side surface 53a of the insulating member 50 at the facing surface 65f toward the radial outer side. That is, in the present embodiment, the purpose is to inhibit the movement of the insulating member 50 toward the radial inner side. On the other hand, the fixation of the cover member 60 and the insulating member 50 using the bosses 5 and the fixing holes 4 is for the purpose of inhibiting the cover member 60 from being detached upward. That is, the fixation using the bosses 5 and the fixing holes 4 of the present embodiment is not for the purpose of restricting the movement of the insulating member 50 toward the radial inner side.

[0093] However, even in the case where the cover member 60 does not contact the inner side surface 53a of the insulating member 50, if the plurality of insulating members 50 are fixed to the cover member 60, the change in the relative positional relationship of the plurality of insulating members 50 to each other is restricted, and thus the detachment of the insulating member 50 with respect to the tooth portion 31b is inhibited. As a result, it is possible to stably fix the insulating member 50 to the stator core 31.

[0094] Next, according to Figure 2 The assembling process of the stator 30 will be described.

[0095] First, the coil wire 41 is wound around the first insulating member 50A, and the first coil 40A is formed. Also, the coil wire 41 is wound around the second insulating member 50B, and the second coil 40B is formed.

[0096] Also, the covering portion 42 is provided on the outer peripheral surface of the first coil 40A. The covering portion 42 of the present embodiment is a heat shrink tube. Therefore, first, the covering portion 42 before shrinkage is covered on the outer peripheral surface of the first coil 40A, and heat is applied to the covering portion 42 to shrink the covering portion 42.

[0097] Next, the six second insulating members 50B are installed from the radial inner side to the tooth portions 31b. At this time, the six second insulating members 50B are installed to the six tooth portions 31b each of which is circumferentially separated by one tooth portion among the twelve tooth portions 31b.

[0098] Next, the first insulating member 50A is installed from the radial inner side to the remaining tooth portions 31b. Thus, the first coil 40A and the second coil 40B are alternately arranged in the circumferential direction.

[0099] Next, the cover member 60 is attached to the insulating member 50 from the lower side. At this time, the boss 5 of the insulating member 50 is inserted into the fixing hole 4 of the insulating member 50, and a separation preventing portion 5a is formed at the front end of the boss 5 by thermocompression bonding of the boss 5 (see FIG. 6). Thus, the lower cover member 60 is fixed to the insulating member 50. Figure 6

[0100] Next, the insulating paper 3 is inserted from the upper side between the inner circumferential surface of the core back portion 31a and the outer side wall portion 53 of the insulating member 50. Also, the cover member 60 is attached to the insulating member 50 from the upper side. At this time, the boss 5 of the insulating member 50 is inserted into the fixing hole 4 of the insulating member 50, and a separation preventing portion 5a is formed at the front end of the boss 5 by thermocompression bonding of the boss 5 (see FIG. 6). Thus, the upper cover member 60 is fixed to the insulating member 50. Figure 6

[0101] According to the present embodiment, the insulating member 50 can be fixed to the stator core 31 without using an adhesive. Thus, the variation in adhesive force caused by variation in the amount of application of the adhesive, and the decrease in adhesive force caused by degradation of the adhesive can be suppressed. Also, when manufacturing is performed, the time required for curing of the adhesive can be shortened compared to when an adhesive is used, and thus the manufacturing cost can be reduced.

[0102] <Variant Example 1>

[0103] Figure 7 is a plan view schematically showing a stator 130 of Variant Example 1 that can be employed in the motor 10 of the above-described embodiment. The main difference of the stator 130 of the present variant example is the structure of the cover member 160. Also, in Figure 7 , the illustration of the lap wire 40c located on the upper side of the cover member 160 is omitted.

[0104] The same reference numerals are assigned to the constituent elements of the same mode as the above-described embodiment, and the description thereof is omitted.

[0105] In the stator 130 of the present variant example, two (total four) cover members 160 are provided on the upper side and the lower side of each of the plurality of insulating members 50. Here, the two cover members 160 provided on the upper side of the four cover members 160 are described, but the two cover members 160 provided on the lower side also have the same structure.

[0106] One of the two cover members 160 provided on the upper side of the insulating member 50 is provided directly above the six coils 40 arranged in the circumferential direction among the twelve coils 40, and the other cover member 160 is provided directly above the remaining six coils 40. The two cover members 160 are the same shape.

[0107] ​​The cover member 160 has a cover body portion 165 and a plurality of (six in this modification) fixing pieces 164. The cover body portion 165 is in a circular arc shape extending along the circumferential direction with the center axis J as the center. The cover body portion 165 extends between the outer side wall portion 53 and the inner side wall portion 54 and along the circumferential direction. One cover body portion 165 contacts the inner side surface 53a of the six insulating members 50 from the radially inner side. Thus, the cover member 160 supports the inner side surface 53a from the radially inner side, and the movement of the insulating members 50 to the radially inner side is suppressed.

[0108] In addition, the cover body portion 165 can also have a protruding rib on the opposing surface toward the radially outer side, and the protruding rib can contact the inner side surface 53a at the front end thereof, as in the above-described embodiment.

[0109] The six fixing pieces 164 protrude from the outer edge 163a of the cover body portion 165 toward the radially outer side, respectively. The plurality of fixing pieces 164 are arranged at equal intervals along the circumferential direction. The fixing pieces 164 are in a plate shape with the axial direction as the thickness direction. A fixing hole 4 that penetrates in the thickness direction is provided in the fixing piece 164. The boss 5 provided in the insulating member 50 is inserted into the fixing hole 4. A separation preventing portion 5a is provided at the front end of the boss 5. Thus, the fixing piece 164 is fixed to the insulating member 50. The six fixing pieces 164 are fixed to different insulating members 50, respectively. Thus, the cover member 160 fixes the six insulating members 50 to each other.

[0110] The cover member 160 according to this modification, as in the above-described embodiment, supports the inner side surface 53a from the radially inner side, and the movement of the insulating members 50 to the radially inner side is suppressed. Thus, the interference of the insulating members 50 with the rotor 20 can be suppressed, and the reliability of the motor 10 can be improved.

[0111] <Modification Example 2>

[0112] Figure 8 Fig. 16 is a plan view schematically showing a stator 230 of Modification Example 2 that can be employed in the motor 10 of the above-described embodiment. The main difference of the stator 230 of this modification is the structure of a cover member 260. In addition, in Figs. 16 and 17, the illustration of the lap wire 40c located on the upper side of the cover member 260 is omitted. Figure 8

[0113] The same reference numerals are assigned to the constituent elements of the same mode as in the above-described embodiment, and the description thereof is omitted.

[0114] In the stator 230 of this modification, six (total twelve) cover members 260 are provided on the upper side and the lower side of the plurality of insulating members 50, respectively. In addition, here, the six cover members 260 provided on the upper side among the twelve cover members 260 are described, but the six cover members 260 provided on the lower side also have the same structure. In addition, all of the cover members 260 have the same shape. ​

[0115] A cover member 260 is arranged across a circumferentially adjacent pair of the insulating members 50. The cover member 260 has a cover body portion 265 and a plurality of fixing pieces 264. The cover body portion 265 is in a circular arc shape extending along the circumferential direction with the center axis J as the center. The cover body portion 265 is located radially outward of the outer side wall portion 53. The cover body portion 265 extends along the circumferential direction along a surface of the outer side wall portion 53 facing the radially outward side. The cover body portion 265 overlaps the core back portion 31a when viewed in the axial direction.

[0116] The cover member 260 has two fixing pieces 264. Each of the fixing pieces 264 protrudes radially inward from an inner edge 265b of the cover body portion 265. The fixing pieces 264 are in a plate shape with the axial direction as the thickness direction. A fixing hole 4 that penetrates in the thickness direction is provided in the fixing piece 264. In addition, the boss 5 provided to the insulating member 50 is inserted into the fixing hole 4. A separation preventing portion 5a is provided to a front end of the boss 5. Thus, the fixing piece 264 is fixed to the insulating member 50. The two fixing pieces 264 are fixed to different insulating members 50, respectively.

[0117] The cover member 260 of the present modification fixes the two insulating members 50 to each other. Thus, the relative positional relationship of the two insulating members 50 is fixed. As a result, the cover body portion 265 can suppress the insulating members 50 from coming out of the tooth portion 31b, thereby suppressing the insulating members 50 from interfering with the rotor 20, and can improve the reliability of the motor 10.

[0118] <Compressor>

[0119] Figure 9 is a schematic view of a compressor 100 provided with the motor 10 of the embodiment. The compressor 100 of the present embodiment has the motor 10, a compression mechanism portion 101 located on the lower side of the motor 10, a housing 109, and a reservoir 108.

[0120] The compression mechanism portion 101 has an eccentric rotor 103 and a cylinder 102 that surrounds the eccentric rotor 103. The eccentric rotor 103 is connected to the shaft 21 of the motor 10 and rotates in conjunction with the driving of the motor 10.

[0121] The housing 109 houses the motor 10 and the compression mechanism portion 101. An intake pipe 104 and a discharge pipe 105 are connected to the housing 109. Lubricating oil is supplied to a lubricating oil accumulation portion 107 inside the housing 109, and the operation of the compression mechanism portion 101 is made smooth.

[0122] The refrigerant and the lubricating oil are stored in a separated state in the reservoir 108. The refrigerant separated in the reservoir 108 is supplied to the compression mechanism portion 101 inside the housing 109 via the intake pipe 104.

[0123] The compressor 100 rotates the eccentric rotor 103 of the compression mechanism section 101 in conjunction with the driving of the motor 10. Thereby, the compressor 100 performs compression in the compression mechanism section 101 by sucking refrigerant from the suction pipe 104 into the cylinder 102. The compressed refrigerant is discharged from the discharge pipe 105 provided at the upper portion of the casing 109 through the periphery and the inside of the motor 10.

[0124] The above describes the embodiments of the present application and modifications thereof, but each structure in the embodiments and modifications and combinations thereof are one example, and addition, omission, substitution, and other changes of the structure can be made within the scope not departing from the gist of the present application. In addition, the present application is not limited to the embodiments.

[0125] For example, in the above-described embodiments, the motor mounted on the compressor is described, but the same structure can be adopted in the motor mounted on a water pump or an oil pump.

Claims

1. A stator, comprising: a stator core having a ring-shaped core back centered on a center axis and a plurality of tooth portions extending from the core back to a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from a radially inner side; coils respectively wound on the insulating members; and a cover member supporting inner side surfaces of the insulating members facing the radially inner side from the radially inner side, the cover member having an opposing surface facing a radially outer side and opposing the inner side surfaces of the insulating members, a plurality of protrusions being provided on the opposing surface, the protrusions being arranged along the circumferential direction and protruding to the radially outer side, and the protrusions being in contact with the inner side surfaces at leading ends.

2. A stator, comprising: a stator core having a ring-shaped core back centered on a center axis and a plurality of tooth portions extending from the core back to a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from a radially inner side; coils respectively wound on the insulating members; and a cover member supporting inner side surfaces of the insulating members facing the radially inner side from the radially inner side, the stator having a plurality of insulating papers arranged along surfaces of the core back facing the radially inner side, the cover member having a cover main body portion on an axial one side of the coils, a receiving recess receiving end portions of the insulating papers on an axial other side of the cover main body portion being provided on a surface of the cover main body portion facing the axial other side.

3. A stator, comprising: a stator core having a ring-shaped core back centered on a center axis and a plurality of tooth portions extending from the core back to a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from a radially inner side; coils respectively wound on the insulating members; and a cover member supporting inner side surfaces of the insulating members facing the radially inner side from the radially inner side, a plurality of the coils being connected to each other by a plurality of lap wires extending along the circumferential direction on an axial one side of the coils, the lap wires being bundled by a bundling tape, the cover member having a cover main body portion on the axial one side of the coils and on an axial other side of the lap wires, a rib protruding to the axial one side and extending along a radial direction being provided on a surface of the cover main body portion facing the axial one side.

4. A stator, comprising: a stator core having a ring-shaped core back centered on a center axis and a plurality of tooth portions extending from the core back to a radially inner side and arranged along a circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from a radially inner side; coils respectively wound on the insulating members; and a cover member supporting inner side surfaces of the insulating members facing the radially inner side from the radially inner side, a plurality of the coils being connected to each other by a plurality of lap wires extending along the circumferential direction on an axial one side of the coils, the lap wires being bundled by a bundling tape, the cover member having a cover main body portion on the axial one side of the coils and on an axial other side of the lap wires, a groove extending along the radial direction being provided on a surface of the cover main body portion facing the axial one side, a circumferential position of the bundling tape coinciding with a circumferential position of the groove. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5. The stator according to any one of claims 1 to 4, wherein the insulating member has a wall portion extending in the circumferential direction and provided with the inner side surface, the cover member is annular and embedded in the inner side of the plurality of wall portions.

6. The stator according to any one of claims 1 to 4, wherein the cover member is fixed to the insulating member.

7. The stator according to claim 6, wherein the insulating member has a boss projecting toward the cover member, a fixing hole into which the boss is inserted is provided in the cover member.

8. The stator according to claim 7, wherein a front end of the boss is provided with a separation preventing portion larger in diameter than the fixing hole.

9. The stator according to claim 1, wherein the inner side surface of one of the insulating members is in contact with the protrusion located on the circumferential side of the center line of the tooth portion and the protrusion located on the circumferential side opposite to the center line of the tooth portion, when viewed in the axial direction.

10. The stator according to any one of claims 1 to 4, wherein the cover member has a cover main body portion located on the axial side of the coil, a recess recessed toward the radially inner side is provided in an outer edge of the cover main body portion located on the radially outer side, a coil wire extending from the coil passes through the recess.

11. The stator according to any one of claims 1 to 4, wherein the insulating member has a pair of arm portions extending toward both circumferential sides, inner peripheral surfaces of the arm portions are in contact with outer peripheral surfaces of the insulating members located on the radially outer side in the circumferential direction.

12. The stator according to any one of claims 1 to 4, wherein the stator has two cover members, one of the cover members supports the inner side surface on the axial side of the insulating member, the other of the cover members supports the inner side surface on the axial side opposite to the insulating member.

13. A stator having: a stator core having a ring-shaped core back portion centered on a center axis and a plurality of tooth portions extending from the core back portion toward the radially inner side and arranged in the circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from the radially inner side; coils respectively wound around the insulating members; and cover members respectively fixed to the insulating members, the insulating members having bosses projecting toward the cover members, fixing holes into which the bosses are inserted being provided in the cover members, the cover members having facing surfaces facing the radially outer side and facing the inner side surfaces of the insulating members, a plurality of protrusions arranged in the circumferential direction and projecting toward the radially outer side being provided in the facing surfaces, and the plurality of protrusions being in contact with the inner side surfaces at front ends.

14. A stator having: a stator core having a ring-shaped core back portion centered on a center axis and a plurality of tooth portions extending from the core back portion toward the radially inner side and arranged in the circumferential direction; a plurality of insulating members respectively mounted to the tooth portions from the radially inner side; coils respectively wound around the insulating members; and cover members respectively fixed to the insulating members, the insulating members having bosses projecting toward the cover members, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A fixing hole into which the boss is inserted is provided in the cover member, The stator has a plurality of insulation papers arranged along a face of the core back toward a radially inner side, The cover member has a cover main body portion on an axial one side of the coil, A receiving recess that receives an end portion of the insulation paper on an axial one side is provided on a face of the cover main body portion toward an axial other side.

15. A stator, comprising: a stator core having a ring-shaped core back centered on a center axis and a plurality of tooth portions extending from the core back toward a radially inner side and arranged along a circumferential direction; a plurality of insulation members respectively mounted to the tooth portions from a radially inner side; a coil respectively wound around the insulation members; a cover member respectively fixed to the insulation members, the insulation members have a boss protruding toward the cover member, a fixing hole into which the boss is inserted is provided in the cover member, a plurality of the coils are connected to each other by a lap wire extending along the circumferential direction on an axial one side of the coil, a plurality of the lap wires are bundled by a bundling tape, the cover member has a cover main body portion on an axial one side of the coil and on an axial other side of the lap wire, a rib protruding toward an axial one side and extending along a radial direction is provided on a face of the cover main body portion toward an axial one side.

16. A stator, comprising: a stator core having a ring-shaped core back centered on a center axis and a plurality of tooth portions extending from the core back toward a radially inner side and arranged along a circumferential direction; a plurality of insulation members respectively mounted to the tooth portions from a radially inner side; a coil respectively wound around the insulation members; a cover member respectively fixed to the insulation members, the insulation members have a boss protruding toward the cover member, a fixing hole into which the boss is inserted is provided in the cover member, a plurality of the coils are connected to each other by a lap wire extending along the circumferential direction on an axial one side of the coil, a plurality of the lap wires are bundled by a bundling tape, the cover member has a cover main body portion on an axial one side of the coil and on an axial other side of the lap wire, a groove extending along a radial direction is provided on a face of the cover main body portion toward an axial one side, a circumferential position of the bundling tape coincides with a circumferential position of the groove.

17. The stator according to any one of claims 13 to 16, wherein a front end of the boss is provided with a dropout preventing portion larger than an inner diameter of the fixing hole.

18. A motor, comprising: the stator according to any one of claims 1 to 17; a rotor opposed to the stator in a radial direction; and a housing that houses the stator and the rotor.

19. The motor according to claim 18, wherein in the housing, refrigerant flows from an axial one side of the stator toward an axial other side, the refrigerant passes through grooves between the tooth portions. ​ ​

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