Electric motors and compressors

Abstract

To provide a technology in which an insulating characteristic of an electric motor can be improved.SOLUTION: A tooth 112 has, at an end thereof, a tooth projection portion 114A that is projected to one side in the circumferential direction and a tooth projection portion 114B that is projected to the other side in the circumferential direction. A slot insulation member 120 includes a body portion (122, 123, 124) that is disposed so as to extend from an inner circumferential surface 111a of a yoke 111 to respective side surfaces of a pair of adjacent teeth 112, and ends 121 and 125 that are formed by folding both ends of the body portion so as to get close to each other. An interphase insulation member 170 includes an interphase insulation portion (172, 173) disposed between winding portions 131 of different phases, and ends 171 and 174 that are formed by folding both ends of the interphase insulation portion so as to be separated away from each other. The end 171 (174) of the interphase insulation member 170 is disposed between the tooth projection portion 114B (114A) and the end 121 (125) of the slot insulation member 120.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electric motor and a compressor driven by the electric motor. [Background technology]

[0002] Eco-cars, such as hybrid vehicles (HVs), electric vehicles (EVs), and fuel cell vehicles (FCVs), use compressors in their air conditioners that are driven by an electric motor (called "electric compressors"). In recent years, as vehicle power supply voltages have become higher, there has been a demand for high-voltage motors used in electric compressors, which has led to the development of technologies for ensuring insulation distances between components and preventing contact between components. The electric motor that drives the compression mechanism is, for example, an electric motor (called a "concentrated winding electric motor") that includes a stator (called a "concentrated winding stator") in which a conducting wire forming a stator winding is wound around the teeth of a stator core (called a "concentrated winding stator") with resin bobbins placed on the end faces of the stator core on both sides of the axial direction of the stator core. The conducting wire is made of a conductor such as copper or aluminum and an insulating coating that covers the outer periphery of the conductor. Typically, slot insulators are provided to prevent poor insulation between the conductors and the stator core. The slot insulators are arranged in slots defined by a yoke and two circumferentially adjacent teeth, and extend along the inner periphery of the slots. Furthermore, the windings wound around the two teeth (circumferentially adjacent teeth) that define a slot constitute different-phase stator windings. Therefore, to prevent poor insulation between the windings of different phases, an interphase insulating member is provided. The interphase insulating member is placed between the windings wound around the two teeth that form the slot. An electric motor in which slot insulating members and interphase insulating members are arranged in the slots is disclosed in, for example, Patent Document 1. In the electric motor disclosed in Patent Document 1, the slot insulator has a main body and a pair of first end portions formed by bending both ends of the main body toward each other. The interphase insulator has an interphase insulator and a pair of second end portions formed by bending both ends of the interphase insulator away from each other. The interphase insulator is inserted into the slot so that the interphase insulator is positioned between the winding portions of different phases and the second end portions are positioned radially inward of the first end portions of the slot insulator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-279218 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric motor disclosed in Patent Document 1, the second end of the interphase insulator is located radially inward from the first end of the slot insulator, which means that if the interphase insulator moves, a gap may form between the interphase insulator and the slot insulator, potentially degrading the insulation characteristics. The present invention has been devised in view of the above points, and has an object to provide a technique capable of improving insulation characteristics. [Means for solving the problem]

[0005] The first invention relates to an electric motor. The electric motor of the first aspect of the invention includes a stator and a rotor arranged rotatably relative to the stator. As the rotor, any of various known rotor configurations can be used. The stator includes a stator core, a plurality of insulating members, and a stator winding. The stator core is formed, for example, by laminating electromagnetic steel sheets. The stator core has an annular yoke centered on the axis of the stator core, multiple teeth extending radially inward from the yoke, and multiple slots defined by the yoke and adjacent pairs of teeth. The teeth have a pair of tooth protrusions at their tips opposite the yoke that protrude to one circumferential side and the other circumferential side. The stator winding is made up of multiple phase stator winding sections each having a plurality of winding portions, each having a plurality of winding portions wound around a plurality of teeth of the stator core. The multiple insulating members include a sheet-shaped first insulating member and multiple sheet-shaped second insulating members. The first insulating member provides insulation between the yoke and the pair of teeth and the winding portions wound around the pair of teeth. The second insulating member provides insulation between the winding portions wound around each of the pair of teeth. In the present invention, the first insulating member has a main body and a pair of first end portions. The main body is disposed from the inner peripheral surface of the yoke that defines the slot to the side surfaces of each of the pair of teeth. The pair of first end portions are formed by bending both ends of the main body so as to approach each other. The second insulating member has an interphase insulator and a pair of second end portions. The interphase insulator is disposed between the winding portions wound around each of the pair of teeth. The pair of second end portions are formed by bending both ends of the interphase insulator away from each other. The tooth protrusions, the second end portions, and the first end portions are arranged in this order from the radially inner side to the radially outer side so as to overlap with each other in the radial direction. The stator also has a first resin bobbin and a second resin bobbin arranged on both axial end faces of the stator core, and the first resin bobbin and the second resin bobbin are made of, for example, a resin having insulating properties. The first and second resin bobbins each have an outer wall portion and a plurality of extending portions. The outer wall portion extends in the circumferential direction and is disposed so as to face the yoke. The plurality of extending portions extend radially inward from the outer wall portion and are disposed so as to face the plurality of teeth. The extending portions of the first resin bobbin have, at their tip ends opposite the outer wall portion, a first movement restricting portion protruding to one circumferential side and a second movement restricting portion protruding to the other circumferential side. The first movement restricting portion protrudes to face the slot located on the one circumferential side of the extending portions. The second movement restricting portion protrudes to face the slot located on the other circumferential side of the extending portions. The extending portions of the second resin bobbin have, at their tips opposite the outer wall portion, a third movement restricting portion protruding toward one circumferential side and a fourth movement restricting portion protruding toward the other circumferential side. The third movement restricting portion protrudes to face the slot located on the one circumferential side of the extending portion. The fourth movement restricting portion protrudes to face the slot located on the other circumferential side of the extending portion. The first movement restricting portion has a first inner wall protruding portion that protrudes toward the stator core along the axial direction, and the second movement restricting portion has a second inner wall protruding portion that protrudes toward the stator core along the axial direction. The bent portion between the main body of the first insulating member and one of the pair of first ends is disposed radially inward from the first inner wall protruding portion, and the bent portion between the main body of the first insulating member and the other of the pair of first ends is disposed radially inward from the second inner wall protruding portion. The first inner wall protrusion and the second inner wall protrusion restrict radially outward movement of the first insulating member, thereby easily restricting radial movement of the first insulating member disposed in the slot. The electric motor of the first aspect of the present invention can prevent poor insulation caused by movement of the interphase insulating member, thereby improving the insulation characteristics. In another embodiment of the first invention, the first insulating member is disposed in the slot so that the distance between the tooth protrusion and the first end increases toward the adjacent tooth, and the second insulating member has its second end disposed within the region defined by the tooth protrusion and the first end of the first insulating member. In this embodiment, the second insulating member can be easily placed in the slot. can. In a different embodiment of the first aspect of the present invention, the first to fourth movement restricting portions have first to fourth axial movement restricting surfaces facing the slot, and the first to fourth axial movement restricting surfaces extend in the circumferential and radial directions. The first and second axial movement restricting surfaces restrict movement of the second insulating member to one axial side, and the third and fourth axial movement restricting surfaces restrict movement of the second insulating member to the other axial side. In this embodiment, the movement of the second insulating member disposed in the slot along the axial direction can be easily restricted. In another embodiment of the first invention, the first resin bobbin and the second resin bobbin extension part teeth, top surface And a pair side and, top surface is disposed on the opposite side of the teeth along the axial direction. side teeth, top surface The rotors are arranged on one circumferential side and the other circumferential side of the teeth, respectively, and face the side surfaces of the teeth on one circumferential side and the other circumferential side. and, top surface and a pair side At least one of the connecting portions is formed with a plurality of grooves for winding the wound portion in an aligned manner. In this embodiment, the first row of conductors constituting the winding section are wound in an aligned manner using a plurality of grooves, which prevents the second and subsequent rows of conductors from crossing each other, allowing the conductors to be wound in an aligned manner without crossing each other. In this embodiment, the winding portion can be wound in an aligned manner, and the space factor of the conductor wire in the slot can be increased. In a different embodiment of the first aspect of the present invention, the plurality of grooves are arranged along the winding direction. top surface At least one of side The protrusions are formed by a plurality of protrusions that extend parallel (including "substantially parallel") to one another over a length of the winding direction. At least one end of each of the protrusions in the winding direction is chamfered. In this embodiment, the grooves can be easily formed, and the conductor constituting the wound portion can be prevented from being damaged by the tips of the protrusions that form the grooves. In a different aspect of the first aspect of the invention, The first resin bobbin and the second resin bobbin are disposed radially inward from the outer wall portion, extend in the circumferential direction, and have a plurality of inner wall portions connected to the outer wall portion by extension portions. top surface and the inner peripheral surface of the outer wall portion, and top surface and the outer peripheral surface of the inner wall portion, a step portion is formed that protrudes in the axial direction toward the opposite side from the teeth. In this embodiment, a stepped surface is formed on at least one of the radially outer end and the radially inner end of the connecting portion, so that the first row of conductors constituting the winding portion are wound in an aligned manner, thereby preventing the second and subsequent rows of conductors from crossing each other, and allowing the conductors to be wound in an aligned manner without crossing each other. In this embodiment, the winding portion can be wound in an aligned manner, and the space factor of the conductor wire in the slot can be increased. The second invention relates to a compressor. The compressor of the second aspect of the present invention includes a compression mechanism that compresses a cooling medium and an electric motor that drives the compression mechanism, and any of the electric motors described above is used as the electric motor. As the compression mechanism for compressing the cooling medium, compression mechanisms of various known configurations can be used. The compressor of the second invention has the same effects as any of the electric motors described above. [Effects of the Invention]

[0006] By using the electric motor and compressor of the present invention, it is possible to prevent insulation failure caused by movement of the interphase insulating member. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view of a stator constituting a first embodiment of an electric motor of the present invention. [Figure 2] 2 is a perspective view of the stator shown in FIG. 1 with the cover removed. FIG. [Figure 3] FIG. 2 is a perspective view of a first resin bobbin that constitutes a stator used in the electric motor of the first embodiment. [Figure 4] FIG. 3 is a perspective view of a second resin bobbin that constitutes a stator used in the electric motor of the first embodiment. [Figure 5] 3 is a diagram showing the positional relationship between a stator core, slot insulating members, interphase insulating members, and a resin bobbin in a stator used in the electric motor of the first embodiment. FIG. [Figure 6] 2 is a perspective view of a main part of a first resin bobbin that constitutes a stator used in the electric motor of the first embodiment. FIG. [Figure 7] 3 is a cross-sectional view of a first resin bobbin that constitutes a stator used in the electric motor of the first embodiment. FIG. [Figure 8] FIG. [Figure 9] 4 is a cross-sectional view of a portion corresponding to a notch in an outer wall portion of a second resin bobbin that constitutes a part of the stator used in the electric motor of the first embodiment. FIG. [Figure 10] FIG. 2 is a perspective view of a slot insulating member that constitutes a stator used in the electric motor of the first embodiment. [Figure 11] FIG. 2 is a perspective view of an interphase insulating member that constitutes a stator used in the electric motor of the first embodiment. [Figure 12] 10A and 10B are diagrams illustrating the operation of inserting an interphase insulating member into a slot. [Figure 13] 10A and 10B are diagrams illustrating the operation of inserting an interphase insulating member into a slot. [Figure 14] FIG. 1 is a perspective view of a cover that constitutes a stator used in the electric motor of the first embodiment; [Figure 15] FIG. 2 is a perspective view of a cover constituting a stator used in the electric motor of the first embodiment, as viewed from the back side. [Figure 16] 4A and 4B are views showing engagement pieces of a cover that constitutes a stator used in the electric motor of the first embodiment. [Figure 17] 10A and 10B are diagrams illustrating an attachment mechanism for attaching the cover to the second resin bobbin. [Figure 18] FIG. 10 is a diagram showing a state in which the cover is attached to the second resin bobbin. [Figure 19] FIG. 10 is a diagram showing an insulating member covering a neutral point. [Figure 20] 10A and 10B are diagrams illustrating an example of a method for arranging an insulating member covering a neutral point. [Figure 21] 10A to 10C are diagrams showing different examples of methods for arranging an insulating member covering a neutral point. [Figure 22] FIG. 10 is a perspective view of a stator used in a second embodiment of the electric motor of the present invention. [Figure 23] FIG. 23 is a perspective view of the stator shown in FIG. 22 with the cover removed. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this specification, the direction in which the axis P of the stator core (see Figures 1 and 2) extends is referred to as the "axial direction." The axis P of the stator core corresponds to the rotation center line of the rotor when the rotor is rotatably arranged on the stator. Also, the circumferential direction centered on the axis P when viewed from one side in the axial direction is referred to as the "circumferential direction." Further, the extending direction of a line passing through the axis P when viewed from one side in the axial direction is referred to as the "radial direction." The term "radially inner" refers to the side of the axis P along the radial direction, and the term "radially outer" refers to the side opposite the axis P along the radial direction. In addition, with respect to the resin bobbin (first resin bobbin, second resin bobbin), slot insulating member, interphase insulating member, and cover, the terms "axial direction," "circumferential direction," and "radial direction" refer to the "axial direction," "circumferential direction," and "radial direction" when they are arranged on the stator core. 1 and 2, the upper side of the paper surface will be referred to as "one side in the axial direction," and the lower side of the paper surface will be referred to as "the other side in the axial direction." 1 and 2, the clockwise direction about the axis P is referred to as "one circumferential side" and the counterclockwise direction is referred to as "the other circumferential side." Of course, the terms "one axial side", "the other axial side", "one circumferential side" and "the other circumferential side" may be reversed.

[0009] A stator 10 constituting a first embodiment of an electric motor of the present invention will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a perspective view of the stator 10. Fig. 2 is a perspective view of the stator 10 with the cover removed. The stator 10 is composed of a stator core 100 , a first resin bobbin 200 , a second resin bobbin 300 , a slot insulating member 120 , a stator winding 130 , an interphase insulating member 170 , and a cover 400 .

[0010] The stator core 100 is formed by laminating electromagnetic steel sheets. The stator core 100 has a cylindrical shape and has a stator core end face 100A on one side in the axial direction and a stator core end face 100B on the other side in the axial direction. As shown in FIG. 5, which is a view seen from one side in the axial direction, the stator core 100 has a yoke 111, a plurality of teeth 112, and a plurality of slots 115. The yoke 111 extends in the circumferential direction and is formed in an annular shape in this embodiment. The multiple teeth 112 are spaced apart along the circumferential direction and extend radially inward from the yoke 111. The teeth 112 have tooth bases 113 extending radially inward from the yoke 111, and tooth tip portions 114 provided at the tips of the tooth bases 113 and extending along the circumferential direction. Tooth base 113 has a first tooth base side surface 113a on one circumferential side and a second tooth base side surface 113b on the other circumferential side. The tooth tip portion 114 has a tooth tip inner surface 114a on the radially inner side, a first tooth tip outer surface 114b on the radially outer side on one circumferential side, and a second tooth tip outer surface 114c on the radially outer side on the other circumferential side. Teeth tip portions 114 have first tooth protrusions 114A protruding from tooth base portions 113 to one circumferential side and second tooth protrusions 114B protruding from tooth base portions 113 to the other circumferential side. First tooth protrusions 114A are formed by tooth tip inner peripheral surfaces 114a and first tooth tip outer peripheral surfaces 114b, and second tooth protrusions 114B are formed by tooth tip inner peripheral surfaces 114a and second tooth tip outer peripheral surfaces 114c. In this embodiment, the first tooth protrusion 414A and the second tooth protrusion 114B correspond to the "pair of tooth protrusions" of the present invention. The inner peripheral surfaces 114a of the tooth tips define a stator core inner space 100a. A rotor is rotatably disposed within the stator core inner space 100a. As the rotor, rotors of various known configurations can be used.

[0011] The stator 10 and the rotor disposed in the stator core inner space 100a constitute a first embodiment of the electric motor of the present invention. Although not shown in the figures, a compressor that uses a compression mechanism that compresses a cooling medium and the electric motor of the first embodiment as the electric motor that drives the compression mechanism corresponds to the first embodiment of the compressor of the present invention. As the compression mechanism for compressing the cooling medium, compression mechanisms of various known configurations can be used.

[0012] A slot 115 is defined by two circumferentially adjacent teeth 112 and the yoke 111. The slot 115 is defined by a yoke inner peripheral surface 111a of the yoke 111, a second tooth base side surface 113b and a second tooth tip outer peripheral surface 114c of the tooth 112 on one circumferential side, and a first tooth base side surface 113a and a first tooth tip outer peripheral surface 114b of the tooth 112 on the other circumferential side. A slot opening 115a communicating with the slot 115 is formed between the tooth tips 114 of adjacent teeth 112.

[0013] A slot insulating member is inserted into the slot 115 . In this embodiment, a slot insulating member 120 shown in FIG. 10 is used. The slot insulating member 120 is formed by folding a sheet-shaped resin film made of a resin having insulating properties. As the resin film, resin films made of various known resins can be used. 10, slot insulation member 120 is formed by folding a rectangular insulating film having edge portions 120a and 120b extending in the axial direction and edge portions 120c and 120d extending in a direction intersecting the axial direction along folding lines 120A to 120D. Slot insulation member 120 is divided by folding lines 120A to 120D into a first end portion 121, a first intermediate portion 122, a central portion 123, a second intermediate portion 124, and a second end portion 125. 10, the slot insulation member 120 has a first intermediate portion 122, a central portion 123, and a second intermediate portion 124 bent into a generally U-shape. The first intermediate portion 122, the central portion 123, and the second intermediate portion 124 form a main body. The first end portion 121 and the second end portion 125 are bent so as to approach each other, i.e., so as to enter the center of the U-shape. 5, the slot insulating member 120 has a main body extending from the yoke inner peripheral surface 111a to the second tooth base side surface 113b of the tooth 112 on one circumferential side and the first tooth base side surface 113a of the tooth 112 on the other circumferential side. The slot insulating member 120 is also disposed so that the first end 121 faces the second tooth tip outer peripheral surface 114c of the tooth 112 on one circumferential side, and the second end 125 faces the first tooth tip outer peripheral surface 114b of the tooth 112 on the other circumferential side. When inserted into the slot 115, the slot insulating member 120 is bent so that the distance between the first end 121 and the outer peripheral surface 114c of the second tooth tip of the tooth 112 on one circumferential side increases toward the other circumferential side. Similarly, the slot insulating member 120 is bent so that the distance between the second end 125 and the outer peripheral surface 114b of the first tooth tip of the tooth 112 on the other circumferential side increases toward the one circumferential side. In this embodiment, the slot insulating member 120 corresponds to a "first insulating member" of the present invention. The first end portion 121 and the second end portion 125 correspond to a "pair of first ends of the first insulating member" of the present invention. In FIG. 5, the slot insulating member 120 is inserted into the slot 115 so that the first end 121 is positioned on one circumferential side and the second end 125 is positioned on the other circumferential side, but it may also be inserted into the slot 115 so that the first end 121 is positioned on the other circumferential side and the second end 125 is positioned on one circumferential side. In this case, end portion 121 and intermediate portion 122 become a second end portion and a second intermediate portion, and end portion 125 and intermediate portion 124 become a first end portion and a first intermediate portion.

[0014] 2, the first resin bobbin 200 and the second resin bobbin 300 are arranged on both axial end faces of the stator core 100. In the first embodiment, a case will be described in which the first resin bobbin 200 is arranged on the stator core end face 100A on one axial side of the stator core 100, and the second resin bobbin 300 is arranged on the stator core end face 100B on the other axial side. In this case, the resin bobbin end face 250A of the first resin bobbin 200 faces the stator core end face 100A, and the resin bobbin end face 350A of the second resin bobbin 300 faces the stator core end face 100B. The first resin bobbin 200 and the second resin bobbin 300 are made of a resin having insulating properties.

[0015] As shown in FIG. 3, the first resin bobbin 200 has an outer wall portion 210 , a plurality of inner wall portions 220 , and a plurality of connecting portions 250 . The outer wall portion 210 extends in the circumferential direction and the axial direction and is disposed so as to face the yoke 111 of the stator core 100. The inner wall portion 220 is disposed radially inward of the outer wall portion 210 and extends in the circumferential and axial directions. The connecting portion 250 extends in the circumferential and radial directions, and connects the outer wall portion 210 and the inner wall portion 220. The outer wall portion 250 is disposed so as to face the teeth 112 (more specifically, the tooth bases 113) of the stator core 100. 5 and 6, the inner wall portion 220 has a first flange portion 230 protruding to one circumferential side and a second flange portion 240 protruding to the other circumferential side. Note that Fig. 6(b) is a perspective view of Fig. 6(a) as viewed from the direction of arrow b. 5, the first flange 230 protrudes to face the slot 115 located on one circumferential side of the connecting portion 250. The second flange 240 protrudes to face the slot 115 located on the other circumferential side of the connecting portion 250.

[0016] The first flange 230 has a first movement restriction surface 231 facing the slot 115, and has an outer peripheral surface 232 on one circumferential side. The second flange 240 has a second movement restriction surface 241 facing the slot 115, and has an outer peripheral surface 242 on the other circumferential side. The first flange 230 has a first inner wall protruding portion 233 that protrudes toward the stator core 100 (the stator core end face 100A side). The first inner wall protruding portion 233 has an end face 233a on the radially inner side and a side face 233b on the other circumferential side. A recess 230a that is open on one circumferential side and the other axial side (the stator core end surface 100A side) is formed by the first movement restricting surface 231, the end face 233a of the first inner-wall protruding portion 233, and the first side face 252 of the connecting portion 250 of the first resin bobbin 200. A recess 230b that is open on the other axial side, the radially inner side, and the radially outer side is formed by the first side face 252 of the connecting portion 250 of the first resin bobbin 200 and the side face 233b of the first inner-wall protruding portion 233. The second flange 240 has a second inner wall protruding portion 243 that protrudes toward the stator core 100 (the stator core end face 100A side). The second inner wall protruding portion 243 has an end face 243a on the radially inner side and a side face 243b on one circumferential side. A recess 240a that is open on the other circumferential side and the other axial side (the stator core end face 100A side) is formed by the second movement restricting surface 241, the end face 243a of the second inner wall protruding portion 243, and the second side face 253 of the connecting portion 250 of the first resin bobbin 200. A recess 240b that is open on the other axial side, the radially inner side, and the radially outer side is formed by the second side face 253 of the connecting portion 250 of the first resin bobbin 200 and the side face 243b of the second inner wall protruding portion 243. The end surface 233a and the end surface 243a extend in the axial direction and the circumferential direction.

[0017] In this embodiment, the first flange portion 230 corresponds to a "first movement restriction portion" of the present invention. The first movement restriction surface 231 corresponds to a "first axial movement restriction surface" of the present invention, and the end surface 233a corresponds to a "first radial movement restriction surface" of the present invention. The second flange portion 240 corresponds to a "second movement restricting portion" of the present invention. The second movement restricting surface 241 corresponds to a "second axial movement restricting surface" of the present invention, and the end surface 243a corresponds to a "second radial movement restricting surface" of the present invention.

[0018] As shown in FIG. 4, the second resin bobbin 300 has an outer wall portion 310, a plurality of inner wall portions 320, and a plurality of connecting portions 350, similar to the first resin bobbin 100. In this embodiment, the connecting portion 250 of the first resin bobbin 100 and the connecting portion 350 of the second resin bobbin 300 correspond to the "extending portion extending radially inward from the outer wall portion" of the present invention. The inner wall portion 320 of the second resin bobbin 300 is configured similarly to the inner wall portion 220 of the first resin bobbin 200. Therefore, the configuration of the inner wall portion 320 will be described with reference to Fig. 6. In Fig. 6, the reference numerals of the respective elements of the second resin bobbin 300 are written in parentheses. The outer wall portion 310 extends in the circumferential direction and the axial direction and is disposed so as to face the yoke 111 of the stator core 100. The inner wall portion 320 is disposed radially inward of the outer wall portion 310 and extends in the circumferential and axial directions. The connecting portion 350 extends in the circumferential and radial directions, and connects the outer wall portion 310 and the inner wall portion 320. The outer wall portion 350 is disposed so as to face the teeth 112 (more specifically, the tooth bases 113) of the stator core 100. The inner wall portion 320 has a third flange portion 330 that protrudes toward one circumferential side and a fourth flange portion 340 that protrudes toward the other circumferential side. The third flange portion 330 protrudes to face the slot 115 that is located on one circumferential side of the connecting portion 350. The second flange portion 340 protrudes to face the slot 115 that is located on the other circumferential side of the connecting portion 350.

[0019] The third flange 330 has a third movement restricting surface 331 facing the slot 115, and has an outer peripheral surface 332 on one circumferential side. The fourth flange 340 has a fourth movement restricting surface 341 facing the slot 115, and has an outer peripheral surface 342 on the other circumferential side. The third movement restricting surface 331 and the fourth movement restricting surface 441 extend in the circumferential direction and the radial direction. The third flange 330 has a third inner wall protruding portion 333 protruding toward the stator core 100 (the stator core end face 100B side). The third inner wall protruding portion 333 has an end face 333a on the radially inner side and a side face 333b on the other circumferential side. A recess 330a that is open on one circumferential side and one axial side (the stator core end surface 100B side) is formed by the third movement restricting surface 331, the end face 333a of the third inner wall protruding portion 333, and the first side face 352 of the connecting portion 350 of the second resin bobbin 300. A recess 330b that is open on one axial side, the radially inner side, and the radially outer side is formed by the first side face 352 of the connecting portion 350 of the second resin bobbin 300 and the side face 333b of the third inner wall protruding portion 333. The fourth flange 340 has a fourth inner wall protruding portion 343 protruding toward the stator core 100 (the stator core end face 100B side). The fourth inner wall protruding portion 343 has an end face 343a on the radially inner side and a side face 343b on one circumferential side. A recess 340a that is open on the other circumferential side and one axial side (the stator core end face 100B side) is formed by the fourth movement restricting surface 341, the end face 343a of the fourth inner wall protrusion 343, and the second side face 353 of the connecting portion 350 of the second resin bobbin 300. A recess 340b that is open on one axial side, the radially inner side, and the radially outer side is formed by the second side face 353 of the connecting portion 350 of the second resin bobbin 300 and the side face 343b of the fourth inner wall protrusion 343. The configuration of the inner wall portion 320 of the second resin bobbin 300 is similar to that of the inner wall portion 220 of the first resin bobbin 200, except that the positional relationship along the axial direction with respect to the stator core 100 is reversed.

[0020] In this embodiment, the third flange portion 330 corresponds to a "third movement restricting portion" of the present invention. The third movement restricting surface 331 corresponds to a "third axial movement restricting surface" of the present invention, and the end surface 333a corresponds to a "third radial movement restricting surface" of the present invention. Furthermore, the fourth flange portion 340 corresponds to a "fourth movement restricting portion" of the present invention. The fourth movement restricting surface 341 corresponds to a "fourth axial movement restricting surface" of the present invention, and the end surface 343a corresponds to a "fourth radial movement restricting surface" of the present invention.

[0021] The stator windings 130 are formed by winding the conductor 132 around the teeth 112 of the stator core 100 and the connecting portions 250 and 350 of the first and second resin bobbins 200 and 300, respectively, with the slot insulating members 120 inserted into the slots 115 of the stator core 100 and the first and second resin bobbins 200 and 300 disposed on the axial end faces of the stator core 100 (see FIG. 8 ). Various known methods can be used to wind the conductor 132 around the teeth 112 and the connecting portions 250 and 350. For example, a method can be used in which a needle that supplies the conductor 132 is rotated around the teeth 112 and the connecting portions 250 and 350. The conductor 132 is made of, for example, a conductor such as copper or aluminum, and an insulating coating that covers the outer periphery of the conductor.

[0022] If the conductor wires 132 cross each other when being wound around the teeth 112, the amount of conductor wires 132 housed in the slots 115 decreases, and the space factor decreases. Here, the state of winding the first row around the teeth 112 has a significant effect on the crossing of the conductor 132. For example, if the first row is not wound in an aligned manner, there is a high possibility that the conductor 132 will cross when winding the second row. In this embodiment, the connecting portion 250 of the first resin bobbin 200 and the connecting portion 350 of the second resin bobbin 300 are formed so as to prevent the conducting wires 132 from crossing each other. The connecting portion 250 of the first resin bobbin 200 and the connecting portion 350 of the second resin bobbin 300 have the same shape. Therefore, the shape of the connecting portion 250 of the first resin bobbin 200 will be described with reference to Fig. 7. Fig. 7(a) is a cross-sectional view of the first resin bobbin 200 taken along the radial direction, and Fig. 7(b) is a cross-sectional view of Fig. 7(a) as viewed from the direction of arrow bb. In FIG. 7, the reference numerals of the components of the connecting portion 350 of the second resin bobbin 300 are written in parentheses.

[0023] The connecting portion 250 has a top surface 251 on the side opposite to the stator core 100, and has a first side surface 252 and a second side surface 253 on one circumferential side and the other circumferential side. The top surface 251 extends along the radial direction and the circumferential direction, and the first side surface 252 and the second side surface 253 extend along the axial direction and the radial direction. A plurality of grooves 254 extending along the circumferential direction are provided at the connection between the top surface 251 and the first side surface 252. In this embodiment, the grooves 254 are formed by protrusions 254a extending parallel (including "approximately parallel") along the circumferential direction. A plurality of grooves 255 extending along the circumferential direction are provided at the connection between the top surface 251 and the second side surface 253. Similar to the grooves 254, the grooves 255 are formed by a plurality of protrusions 255a extending parallel (including "approximately parallel") along the circumferential direction. By providing a plurality of grooves 254 and 255 at the connection portion between the top surface 251 and the first side surface 252 and at the connection portion between the top surface 251 and the second side surface 253, the first row of conductors 132 can be wound in an aligned manner. This makes it possible to prevent the second and subsequent rows of conductors 132 from crossing each other, and allows the conductors 132 to be wound in an aligned manner. By being able to wind the conductors 132 in an aligned manner without crossing each other, the space factor of the conductors 132 in the slot 115 can be increased. If the protrusions 254a forming the grooves 254 and the protrusions 255a forming the grooves 255 have sharp tips, the insulating coating of the conductors 132 disposed in the grooves 254 and 255 may be damaged. For this reason, it is preferable to provide the protrusions 254a and 255a with blunt tips. The term "blunt protrusions" means "protrusions whose tips are not sharp at an acute angle." A blunt protrusion is, for example, a protrusion whose tip has a curved or flat shape, including an arcuate shape (R-surface shape). When the first resin bobbin 200 having the protrusions 254a and 255a is integrally molded with resin, the blunt protrusions 254a and 255a are formed. Of course, a method for processing the tips of the protrusions 254a and 255a, such as chamfering, can also be used.

[0024] Furthermore, a step surface 256 is formed between the top surface 251 of the connecting portion 250 and the inner peripheral surface 211 of the outer wall portion 210, protruding on the side opposite to the stator core 100 (teeth 112). Furthermore, a step surface 257 is formed between the top surface 251 of the connecting portion 250 and the outer circumferential surface 222 of the inner wall portion 220, protruding to the side opposite to the stator core 100 (teeth 112). By forming a step surface 256 at the connection portion between the top surface 251 of the connecting portion 250 and the inner peripheral surface 211 of the outer wall portion 210, or by providing a step surface 257 at the connection portion between the top surface 251 of the connecting portion 250 and the outer peripheral surface 222 of the inner wall portion 220, the first row of conductive wires 132 can be wound in an aligned manner. By winding the first row of conductive wires 132 in an aligned manner, it is possible to prevent the second and subsequent rows of conductive wires 132 from crossing each other. By winding the conductive wires 132 in an aligned manner without crossing each other, it is possible to increase the space factor of the conductive wires 132 in the slot 115. The height of the step surface 256 and the distance between the inner peripheral surface 211 of the outer wall portion 210 and the step surface 256, and the height of the step surface 257 and the distance between the outer peripheral surface 222 of the inner wall portion 220 and the step surface 257 are appropriately set so that the conductive wire 132 is wound in an aligned manner. It is to be noted that any one of the groove 254, the groove 255, the step surface 256 and the step surface 257 may be provided, or an appropriately selected plurality of them may be provided. An end surface 250A of the connecting portion 250 on the stator core 100 side is used as a resin bobbin end surface of the first resin bobbin 200.

[0025] The connecting portion 350 of the second resin bobbin 300 is formed in the same manner as the connecting portion 250 of the first resin bobbin 200 . That is, the connecting portion 350 has a plurality of grooves 354 and grooves 355 formed at the connection portion between the top surface 351 and the first side surface 352 and at the connection portion between the top surface 351 and the second side surface 353. The grooves 354 and grooves 355 are formed by a plurality of protrusions 354a and protrusions 355a extending parallel (including "approximately parallel") along the circumferential direction. In addition, a step surface 356 is formed between the top surface 351 of the connecting portion 350 and the inner surface 311 of the outer wall portion 310, and a step surface 357 is formed between the top surface 351 of the connecting portion 350 and the outer surface 322 of the inner wall portion 320.

[0026] In this embodiment, as shown in FIG. 7, the outer and inner peripheral surfaces of the first resin bobbin 200 on the stator core 100 side are formed into inclined surfaces. Specifically, a portion 212m of the outer peripheral surface 212 of the outer wall portion 210 on the stator core end face 100A side is formed as an inclined surface that slopes radially inward so that the distance between the outer peripheral surface 212 and the stator core end face 100A becomes shorter as the portion approaches the stator core end face 100A. In other words, the inclined surface 212m slopes radially inward toward the stator core end face 100A. Furthermore, a portion 221m of the inner circumferential surface 221 of the inner wall portion 220 on the stator core end face 100A side is formed as an inclined surface that slopes radially outward so that the distance between the inner circumferential surface 221 and the stator core end face 100A becomes shorter as the portion approaches the stator core end face 100A. In other words, the inclined surface 221m slopes radially outward toward the stator core end face 100A. In this embodiment, the portions of the outer and inner peripheral surfaces of the second resin bobbin 300 facing the stator core 100 are also formed as inclined surfaces, similar to the first resin bobbin 200. That is, the portion of the outer peripheral surface 312 of the outer wall portion 310 facing the stator core end face 100B is formed as an inclined surface 312m that slopes radially inward toward the stator core end face 100B. Also, the inner peripheral surface 321 of the inner wall portion 320 is formed as an inclined surface 321m that slopes radially outward toward the stator core end face 100B. The inclined surface may be any of a surface extending linearly (tapered surface), a surface extending curvedly, a surface extending stepwise, and the like.

[0027] In this embodiment, no conductor wires (crossover wires) are wired outside the outer wall portion 210 of the first resin bobbin 200. In this case, the inclined surface 212m formed on the outer peripheral surface 212 of the outer wall portion 210 or the inclined surface 221m formed on the inner peripheral surface 221 of the inner wall portion 220 can increase the insulation distance (creepage distance) between the conductor wires in the recess 200a of the first resin bobbin 200 and the stator 100 (stator core end surface 100A). In this embodiment, a conductor (crossover wire) is wired on the outside of the outer wall portion 310 of the second resin bobbin 300. In this case, the inclined surface 312m formed on the outer peripheral surface 312 of the outer wall portion 310 can increase the insulation distance (creepage distance) between the conductor (crossover wire) wired on the outside of the outer wall portion 310 and the stator core 100 (stator core end surface 100B). In addition, the inclined surface 321m formed on the inner peripheral surface 321 of the inner wall portion 320 can increase the insulation distance (creepage distance) between the conductor in the recess 300a of the second resin bobbin 300 and the stator 100 (stator core end surface 100B). As described above, by forming the stator core side portions of the outer peripheral surface of the resin bobbin (outer peripheral surface of the outer wall portion) and the inner peripheral surface of the resin bobbin (inner peripheral surface of the inner wall portion) into inclined surfaces, the insulation characteristics can be improved without increasing the height of the resin bobbin. The inclined surfaces (the inclined surfaces of the outer wall portion and the inner wall portion) may be provided on only one of the first resin bobbin 200 and the second resin bobbin 300. Also, the inclined surfaces may be provided on only one of the outer peripheral surface of the outer wall portion and the inner peripheral surface of the inner wall portion.

[0028] The stator winding 130 is made up of stator winding portions for multiple phases. In this embodiment, it is made up of stator winding portions for first, second, and third phases (U, V, and W phases). The stator winding portion for each phase has multiple winding portions connected in series or in parallel. 8, each winding portion has a winding portion 131 wound around the tooth 112 (more specifically, the tooth 112 and the connecting portion 250 and the connecting portion 350), and a pair of extension portions 132a and 132b extending continuously from both ends of the winding portion 131. The extension portion 132a is the winding start wire, and the extension portion 132b is the winding end wire. The winding portion 131 is composed of conductors 132 wound in rows (first row to nth row) around the teeth 112 from the inside to the outside. When a current is supplied to the stator winding 130, there is a large potential difference between the first row of conductors 132 wound on the inside of the teeth 112 and the nth row of conductors 132 wound on the outside of the teeth 112. In this case, if the first row of conductors 132 come into contact with the nth row of conductors 132, insulation failure may occur. The first row of conductors 132 extends continuously to the winding start line 132a. For this reason, it is necessary to prevent contact between the winding start line 132a and the conductors 132 wound on the outside of the teeth 112. A method for treating the winding start wire 132a will be described with reference to FIG. Fig. 8(a) is an enlarged view of a main part of the resin bobbin 200, and Fig. 8(b) is a view of Fig. 8(a) as seen from the direction of arrow bb. Note that Fig. 8(a) shows only the first row of the conducting wire 132, but in reality, as shown in Fig. 8(b), multiple rows of the conducting wire are wound.

[0029] In this embodiment, the needle that supplies the conductor wire 132 is inserted into the slot 115 through the slot opening 115a, thereby winding the conductor wire 132 around the tooth 112. In this embodiment, the winding operation by the needle starts from a position on the radially outer side (toward the outer wall portion 210) and ends at a position on the radially outer side (toward the outer wall portion 210). In other words, the winding start wire 132a and the winding end wire 132b are located on the outer wall portion 210 side, on the first side surface 252 or the second side surface 253 side of the connecting portion 250. For this reason, in this embodiment, a plurality of grooves 213 are formed in the outer wall portion 210 of the first resin bobbin 200 at locations (near the connection portions) corresponding to the connection portions with the first side surface 252 or the second side surface 253 of the coupling portion 250. The grooves 213 are open on the side opposite to the stator core 100 along the axial direction, and are also open to the inner circumferential surface 211 and the outer circumferential surface 212 of the outer wall portion 210. The grooves 213 are formed by a side wall 213a on one circumferential side, a side wall 213b on the other circumferential side, and a bottom wall 213c. The winding start wire 132a is drawn from the inside to the outside of the outer wall portion 210 through the groove 213. In other words, the winding start wire 132a is guided to the outside of the outer wall portion 210. The groove 213 is formed so that the winding start wire 132a does not come into contact with, or is spaced closer than a predetermined distance from, the n-th row of conductive wire 132 wound around the outside of the tooth 112. For example, the depth of the groove 213 is set so that the distance H (see FIG. 8(b)) between the n-th row of conductive wire 132 and the winding start wire 132a does not become equal to or smaller than a predetermined value. In this embodiment, by letting the winding start wire 132a, which is continuous with the winding portion 131 wound around the tooth 112, escape to the outside of the outer wall portion 210, it is possible to prevent the winding start wire 132a (the first row of conductor 132 wound around the inside of the tooth 112) and the nth row of conductor 132 wound around the outside of the tooth 112 from coming into contact with or being placed in close proximity to each other.

[0030] Here, at least one of both ends of the first to third phase stator winding portions is connected to a power source. For example, in the case of a star connection, one end is connected to the power source and the other end is connected to a neutral point. In the case of a delta connection, both ends are connected to the power source. The end connected to the power source is formed by a winding start wire 132a or a winding end wire 132b that is continuous with the winding portion 131 that constitutes the stator winding portion, and is called a power source side lead wire. The power supply lead wire is connected to a power supply, so it needs to have high insulation strength. In particular, when the power supply lead wire is formed by the winding start wire 132a, it needs to be prevented from coming into contact with the conductor wire 132 wound around the outside of the tooth 112, as described above. When the power supply side lead wire is configured by the winding start wire 132a, a method for treating the winding start wire 132a will be described with reference to FIG. The winding start wire 132a constituting the power supply lead wire is covered with an insulating tube, which may be made of, for example, a resin having insulating properties. Winding start wire 132a covered with an insulating tube is pulled out from inner circumferential surface 211 to outer circumferential surface 212 of outer wall portion 210 through one of grooves 213 formed in outer wall portion 210 of first resin bobbin 200. It is then pulled back from outer circumferential surface 212 to inner circumferential surface 211 of outer wall portion 210 through the other groove 213. In FIG. 3, the winding start wire 132a is wound around a protrusion formed between two grooves 213. The pulled-back winding start end portion covered with the insulating tube is then routed around one axial side of the winding portion 131 wound around the tooth 112. In other words, the winding start end portion covered with the insulating tube is positioned so as to overlap with the winding portion 131 when viewed from one axial side. When the power supply side lead wire is configured by the winding end wire 132b, it is routed around one side of the winding portion 131 in the axial direction while being covered with an insulating tube. The state in which the power supply lead wire covered with the insulating tube is routed around one side of the winding portion 131 in the axial direction is shown in FIG. 20, as will be described later.

[0031] When winding portions 131 are formed continuously, conductor 132 is routed so that one of a pair of extension portions (winding start wire 132a, winding end wire 132b) continuing from winding portion 131 continues to one of a pair of extension portions continuing from the other winding portion 131. In other words, a crossover wire is provided to connect the two winding portions. In this embodiment, the crossover wire is wired on the second resin bobbin 300 side. 4, the second resin bobbin 300 has a plurality of notches 316 formed in an outer wall portion 310 for pulling the crossover wires from the inside to the outside of the outer wall portion 310 or pulling them back from the outside to the inside. The notches 316 are open on the side opposite the stator core 100 and are also open to the outer peripheral surface 312 and the inner peripheral surface 311 of the outer wall portion 310. The notches 316 are formed by a first side wall 316a on one circumferential side, a second side wall 316b on the other circumferential side, and a bottom wall 316c on the stator core 100 side. In FIG. 4, three types of notches 316A to 316C are formed in the outer wall portion 310 to allow the crossover wires forming the first to third stator winding portions (U-phase to W-phase stator winding portions) to be pulled out from the inside to the outside of the outer wall portion 310 or pulled back from the outside to the inside while preventing contact. Additionally, guide grooves 315A to 315C are formed on the outer peripheral surface 312 of the outer wall portion 310 to route the crossover wires drawn out to the outside of the outer wall portion 310 along the outer peripheral surface 312. The guide grooves 315A to 315C are formed at positions spaced apart in the axial direction to prevent the crossover wires inserted therein from contacting each other. The crossover wire is pulled out from the inside to the outside of outer wall portion 310 through one of notches 316A to 316C. Then, the crossover wire is guided by one of guide grooves 315A to 315C formed in outer peripheral surface 312 of outer wall portion 310 and routed along outer peripheral surface 312. Thereafter, the crossover wire is pulled back from the outside to the inner periphery of outer wall portion 310 through one of notches 316A to 316C. If the depths of the notches 316A to 316C are set to be equal, the strength of the outer wall portion 310 may be reduced. Therefore, in this embodiment, the depths of the cutouts 316A to 316C are set to be different. Thereby, it is possible to suppress a decrease in the strength of the outer wall portion 310 due to forming the cutouts 316A to 316C. That is, the tension of the jumper wire inserted into the cutouts 316A to 316C can be set high, and the movement of the jumper wire can be prevented.

[0032] Here, conventionally, as shown by the dashed line in FIG. 9, the outer peripheral surface 312 and the inner peripheral surface 311 of the outer wall portion 310 extend in an arc shape in parallel, and the distance between the outer peripheral surface 312 and the inner peripheral surface 311 is equal. In this state, the jumper wire is pulled out from the outside to the inside of the outer wall portion 310 through the cutout 316. In this case, as shown by the thin solid line indicated by the arrow A, when the jumper wire passes through the cutout 316, there is a possibility that it may bulge greatly outside the outer wall portion 310. When the jumper wire bulges greatly outside the outer wall portion 310, the jumper wire may approach or contact other components, and there is a possibility of insulation failure. In this embodiment, at least the shape of the outer peripheral surface 312 of the outer wall portion 310 at the location where the jumper wire is pulled back from the outside to the inside of the outer wall portion 310 is changed as shown by the solid line in FIG. 9. That is, the outer peripheral surface 312 of the outer wall portion 310 is cut out such that the distance (radial thickness) L between the outer peripheral surface 312 and the inner peripheral surface 311 becomes smaller as it approaches the cutout 316 along the circumferential direction. Specifically, the inner peripheral surface 311 of the outer wall portion 310 extends in an arc shape as in the conventional case. Also, the outer peripheral surface 312 extends in an arc shape as in the conventional case up to near the cutout 316. Then, the outer wall portion 310 is hollowed out (cut out) from the outer peripheral surface 312 side such that the distance (radial thickness) L between the outer peripheral surface 312 and the inner peripheral surface 311 becomes shorter as it approaches the cutout 316 from before the cutout 316 along the circumferential direction (L2 < L1). In this embodiment, the outer peripheral surface 312 side is hollowed out so as to form an inclined surface 312a extending linearly. Of course, the shape of the inclined surface 312a is not limited to this. For example, in FIG. 9(b), the inclined surface 312a is formed in an arc shape protruding radially outward. In FIG. 9, when the crossover wire is routed clockwise and passes through the notch 316, the outer peripheral surface 312 of the outer wall portion 310 is lightened as shown by the inclined surface 312b. In this way, the outer peripheral surface 312 of the outer wall portion 310 is hollowed out in the area near the cutout 316 so that the radial thickness between the outer peripheral surface 312 and the inner peripheral surface 311 becomes shorter toward the groove 316, thereby preventing the crossover wire from bulging outward from the outer wall portion 310, as shown by the thick arrow B in Figure 9.

[0033] The outer wall 210, inner wall 220, and connecting portion 250 of the first resin bobbin 200 and the outer wall 310, inner wall 320, and connecting portion 350 of the second resin bobbin 300 have the same configuration, except for a configuration that allows the winding start wire, which is continuous with the winding portion, to escape to the outside of the outer wall (groove 213 for passing the winding start wire), and a configuration that routes the crossover wire between different winding portions via the outer peripheral surface of the outer wall (guide grooves 315A-315C that guide the routing position of the crossover wire, and notches 316A-316C that route the crossover wire between the inside and outside of the outer wall). Of course, the first resin bobbin 200 and the second resin bobbin 300 may have the same configuration. In addition, since the second resin bobbin 300 is positioned so that the resin bobbin end face 350A faces the stator core end face 100B, the "one axial side" and the "other axial side" are opposite to those of the first resin bobbin 200.

[0034] In this embodiment, on the first resin bobbin 200 side, one end of each stator winding portion connected to a power source (referred to as a "power source side lead wire") is routed circumferentially within the recess 200a of the first resin bobbin 200. When each stator winding portion is star-connected, the end of each stator winding portion connected to a neutral point (referred to as a "neutral point side lead wire") is also routed circumferentially within the recess 200a of the first resin bobbin 200 while being commonly connected. For example, as shown in FIG. 20 , the power source side leads (160U, 160V) and the neutral point leads (130Ub, 130Vb, 130Wb) are arranged in this order on the opposite side of the stator core 100 from the stator winding 130 (winding portion 131). At this time, the power supply side lead wire and the neutral point side lead wire are fixed to the first resin bobbin 200 with a tie or the like to prevent movement. In this embodiment, as shown in FIG. 13, a thin portion 215 is formed on the outer wall portion 210 of the first resin bobbin 200. Also, adjacent to the thin-walled portion 215, a communication hole 216 is formed which opens to the outer peripheral surface 212 and the inner peripheral surface 211 of the outer wall portion 210. The thin-walled portion 215 is formed at a position spaced radially inward from the outer peripheral surface 212 of the outer wall portion 210. This forms a working space between the thin-walled portion 215 and the outer peripheral surface 212 of the outer wall portion 210. Furthermore, the communication hole 216 is formed at a position adjacent to the thin-walled portion 215 in the axial direction so as to extend along the circumferential direction. This makes it possible to prevent the tying string 180 from protruding outward from the outer peripheral surface 212 of the outer wall portion 210 when the power supply side lead wire or the neutral point side lead wire is fixed using the tying string 180 passed through the communication hole 216.

[0035] Next, the interphase insulating member 170 will be described. In this embodiment, an interphase insulating member 170 shown in FIG. 11 is used. The interphase insulating member 170 is formed by folding a resin film made of a resin having insulating properties. As the resin film, resin films made of various known resins can be used. Interphase insulating member 170 is formed by folding a rectangular insulating film having edge portions 170a and 170b extending along the axial direction and edge portions 170c and 170d extending in a direction intersecting the axial direction along folding lines 170A to 170C. Folding lines 170A to 170C divide interphase insulating member 170 into first end portion 171, first central portion 172, second central portion 173, and second end portion 174. 11, interphase insulating member 170 has first central portion 172 and second central portion 173 bent in a V shape to form an interphase insulating portion. First end portion 171 and second end portion 174 are bent in directions away from each other from both ends of the interphase insulating portion. In other words, interphase insulating member 170 is bent so that its cross section has a V shape. Interphase insulating member 170 corresponds to a "second insulating member" of the present invention. Furthermore, first end portion 171 and second end portion 174 correspond to a "pair of second end portions of a second insulating member" of the present invention.

[0036] The method of inserting the interphase insulating member 170 will be described below. First, referring to Figures 5 and 6, we will explain the state in which the slot insulating member 120 is inserted into the slot 115 of the stator core 110 and the first resin bobbin 200 and the second resin bobbin 300 are arranged on the stator core end faces on both sides of the axial direction of the stator core 100. 5, the slot insulating member 120 has a main body portion (central portion 123, first intermediate portion 122, second intermediate portion 124) arranged from the yoke inner circumferential surface 111a to the second tooth base side surface 113b of the tooth 112 on one circumferential side and the first tooth base side surface 113a of the tooth 112 on the other circumferential side. The first end portion 121 and the second end portion 125 are bent toward each other from both ends of the main body portion and arranged to face the second tooth tip outer surface 114c of the tooth 112 on one circumferential side and the first tooth tip outer surface 114b of the tooth 112 on the other circumferential side. In this state, a first resin bobbin 200 and a second resin bobbin 300 are arranged on the stator core end faces on both sides of the stator core 100 in the axial direction.

[0037] At this time, the slot insulating member 120 is restricted from moving radially outward by the inner wall portion 220 of the first resin bobbin 200 and the inner wall portion 320 of the second resin bobbin 300 . Specifically, the first end portion 121 and the first intermediate portion 122 are disposed within the recesses 240a and 240b of the inner wall portion 220 on one circumferential side of the adjacent inner wall portions 220. That is, the folding line 120B between the first end portion 121 and the first intermediate portion 122 is disposed radially inward from the inner wall protruding portion 243. Furthermore, the first end portion 121 and the first intermediate portion 122 are disposed within the recesses 330a and 330b of the inner wall portion 320 on one circumferential side of the adjacent inner wall portions 320. That is, the folding line 120B between the first end portion 121 and the first intermediate portion 122 is disposed radially inward from the inner wall protruding portion 333. The second end portion 125 and the second intermediate portion 124 are disposed within the recesses 230a and 230b of the inner wall portion 220 on the other circumferential side of the adjacent inner wall portion 220. That is, the folding line 120C between the second end portion 125 and the second intermediate portion 124 is disposed radially inward from the inner wall protruding portion 233. Furthermore, the second end portion 125 and the second intermediate portion 124 are disposed within the recesses 340a and 340b of the inner wall portion 320 on the other circumferential side of the adjacent inner wall portion 320. That is, the folding line 120C between the second end portion 125 and the second intermediate portion 124 is disposed radially inward from the inner wall protruding portion 343. In this case, radially outward movement of the first end 121 is restricted by the inner wall protrusion 243 of the inner wall 220 of the first resin bobbin 200 and the inner wall protrusion 333 of the inner wall 320 of the second resin bobbin 300. In addition, radially outward movement of the second end 125 is restricted by the inner wall protrusion 233 of the inner wall 220 of the first resin bobbin 200 and the inner wall protrusion 343 of the inner wall 320 of the second resin bobbin 300. This restricts radial outward movement of the first end 121 and the second end 125 (slot insulating member 120) while creating spaces between the first end 121 of the slot insulating member 120 and the outer peripheral surface 114c of the second tooth tip of the tooth 112 on one circumferential side, and between the second end 125 of the slot insulating member 120 and the outer peripheral surface 114b of the first tooth tip of the tooth 112 on the other circumferential side. Movement of the slot insulating member 120 along the axial direction is restricted by the inner wall portion 220 of the first resin bobbin 200 and the inner wall portion 320 of the second resin bobbin 300. Specifically, movement of the first end portion 121 along the axial direction is restricted by a second movement restricting surface 241 of the inner wall portion 220 located on one circumferential side and a fourth movement restricting surface 341 of the inner wall portion 320. Movement of the second end portion 125 along the axial direction is restricted by a first movement restricting surface 231 of the inner wall portion 220 located on the other circumferential side and a third movement restricting surface 331 of the inner wall portion 320.

[0038] Next, the operation of inserting the interphase insulating member 170 into the slot 115 will be described with reference to FIGS. The first end 171 of the interphase insulating member 170 is disposed within a region defined by the outer peripheral surface 114c of the second tooth tip of the tooth 112 disposed on one circumferential side of the two teeth 112 defining the slot 115, and the first end 121 of the slot insulating member 120. The second end 174 is disposed within a region defined by the outer peripheral surface 114b of the first tooth tip of the tooth 112 disposed on the other circumferential side of the two teeth defining the slot 115, and the second end 125 of the slot insulating member 120. The interphase insulating portions (first central portion 172 and second central portion 173) are disposed between the winding portions 131 of different phases that are wound around each of two circumferentially adjacent teeth 112.

[0039] When interphase insulation member 170 is inserted into slot 115, it is folded over so that the distance between edges 170a and 170b is reduced, as shown in FIG. Then, in this state, the first end portion 171 and the second end portion 174 are inserted from the edge portion on one side of the axial direction (for example, edge portion 170c) between the outer peripheral surface of the inner wall portion 320 of the second resin bobbin 300 and the outer peripheral surface of the tooth tip portion of the tooth 112, and the interphase insulation portions (first central portion 172, second central portion 173) are inserted between the winding portions 131 of adjacent different phases. Specifically, the first end 171 is inserted between the outer peripheral surface 342 of the inner wall portion 320 and the second tooth tip outer peripheral surface 114c of the tooth 112 so as to be positioned radially inward of the first end 121 of the slot insulating member 120. The second end 174 is inserted between the outer peripheral surface 332 of the inner wall portion 320 and the first tooth tip outer peripheral surface portion 114b of the tooth 112 so as to be positioned radially inward of the second end 125 of the slot insulating member 120. Furthermore, the interphase insulators are inserted between the winding portions 131 of different phases that are wound around the adjacent teeth 112, with the winding portions 131 being spaced apart between the adjacent inner wall portions 320.

[0040] By disposing first end 171 of interphase insulating member 170 in the space defined by tooth tip outer peripheral surfaces 114c of teeth 112 and first end 121 of slot insulating member 120, and disposing second end 174 of interphase insulating member 170 in the space defined by tooth tip outer peripheral surfaces 114b of teeth 112 and second end 125 of slot insulating member 120, it is possible to increase the insulating strength. For example, even if interphase insulating member 170 moves, it is possible to prevent gaps from forming between interphase insulating member 170 (first end 171, second end 174) and slot insulating member 120 (first end 121, second end 125). This prevents poor insulation due to movement of interphase insulating member 170.

[0041] The operation of inserting the interphase insulating member 170 into the slot 115 along the axial direction is completed when the first end 171 abuts against the second movement-restricting surface 241 of the inner wall portion 220 located on one circumferential side of the first resin bobbin 200, or when the second end 174 abuts against the first movement-restricting surface 231 of the inner wall portion 220 located on the other circumferential side of the first resin bobbin 200, as shown in Figure 13. Once insertion into slot 115 is complete, the external force shortening the distance between edges 170a and 170d is released. This causes interphase insulating member 170 to return to its original shape due to its elastic force. That is, first end 171 of interphase insulating member 170 is positioned within recess 240a of inner wall 220 located on one circumferential side, and second end 174 is positioned within recess 230a of inner wall 220 located on the other circumferential side. Movement of interphase insulating member 170 along the axial direction is restricted by inner wall portion 220 of first resin bobbin 200 and inner wall portion 320 of second resin bobbin 300. Specifically, movement of first end portion 171 along the axial direction is restricted by second movement restricting surface 241 of inner wall portion 220 located on one circumferential side and fourth movement restricting surface 341 of inner wall portion 320. Movement of second end portion 174 along the axial direction is restricted by first movement restricting surface 231 of inner wall portion 220 located on the other circumferential side and third movement restricting surface 331 of inner wall portion 320.

[0042] 5, interphase insulating member 170 is inserted into slot 115 so that first end 171 is located on one circumferential side and second end 174 is located on the other circumferential side, but the method of inserting interphase insulating member 170 is not limited to this. For example, interphase insulating member 170 may be inserted into slot 115 so that first end 171 is located on the other circumferential side and second end 174 is located on one circumferential side. In this case, end portion 171 and center portion 172 become the second end portion and second center portion, and end portion 174 and center portion 173 become the first end portion and first center portion.

[0043] Here, it may be desirable to increase the axial insulation strength by increasing the axial length of interphase insulating member 170. For example, to increase the axial insulation distance, it may be desirable to use interphase insulating member 170 that is longer than the distance between first resin bobbin 200 and second resin bobbin 300 that are arranged on both axial ends of stator core 100. When such interphase insulating member 170 is inserted, for example, from the second resin bobbin 300 side, it abuts against first movement restricting surface 231 or second movement restricting surface 241 formed on inner wall portion 220 of first resin bobbin 200. At this time, as shown in Fig. 12 , interphase insulating member 170 protrudes from second resin bobbin 300 on the side opposite stator core 100 along the axial direction. In this case, the insulation distance along the axial direction can be increased by the amount that interphase insulating member 170 protrudes from second resin bobbin 300 on the side opposite stator core 100 along the axial direction.

[0044] When interphase insulating member 170 protrudes from second resin bobbin 300 in the axial direction toward the opposite side from stator core 100, interphase insulating member 170 does not come into contact with third movement restricting surface 331 or fourth movement restricting surface 341 formed on inner wall portion 320 of second resin bobbin 300. Therefore, there is a risk that interphase insulating member 170 may move in the axial direction on the second resin bobbin 300 side. In this embodiment, a cover 400 is attached to the second resin bobbin 300, thereby restricting movement of the interphase insulating member 170 along the axial direction.

[0045] As shown in FIGS. 14, 15, and 16, the cover 400 has an outer peripheral wall 410, an inner peripheral wall 420, and a bottom wall 430. The outer peripheral wall 410 has an outer peripheral surface and an inner peripheral surface, and extends in the circumferential direction and the axial direction. The inner peripheral wall 420 is disposed radially inward of the outer peripheral wall 410, has an outer peripheral surface and an inner peripheral surface, and extends in the circumferential direction and the axial direction. The bottom wall 430 is provided between the outer peripheral wall 410 and the inner peripheral wall 420 and extends in the circumferential and radial directions. The outer peripheral wall 410, the inner peripheral wall 420, and the bottom wall 430 form a recess 400a extending in the circumferential direction. The cover 400 has at least one communication hole that connects the inside and outside. In this embodiment, the communication hole 431 is formed in the bottom wall 430. The communication hole 431 can suppress a temperature rise inside the cover 400. In addition, an attachment mechanism for attaching the cover 400 to the second resin bobbin 300 is provided. In this embodiment, the attachment mechanism is composed of an engagement piece and an engagement recess with which the engagement piece can engage. In this embodiment, as shown in Fig. 16, an engagement piece 440 having a claw 441 is provided on the back side (inside the recess 400a) of the bottom wall 430 of the cover 400. Also, as shown in Fig. 4, an engagement recess 360 is provided on the inner circumferential surface 311 of the outer wall portion 310 of the second resin bobbin 300.

[0046] FIG. 17 shows the cover 400 attached to the second resin bobbin 300. As shown in FIG. 17, the claws 441 of the engagement pieces 440 on the cover 400 engage with the engagement recess forming surface 361 that forms the engagement recess 360 of the second resin bobbin 300, thereby attaching the cover 400 to the second resin bobbin 300. At this time, the outer peripheral wall 410 of the cover 400 is positioned outside the outer wall portion 312 of the second resin bobbin 300. That is, the crossover wires routed along the outer peripheral surface 312 of the second resin bobbin 300 are covered by the outer peripheral wall 410 of the cover 400. This prevents the crossover wires from contacting other components and improves insulation characteristics. Furthermore, the tension of the crossover wires routed along the outer peripheral surface 312 of the outer wall portion 310 acts to reduce the diameter of the outer wall portion 310. On the other hand, the force generated when the engaging pieces 440 engage with the engaging recesses 360 acts to expand the diameter of the outer wall portion 310. This makes it possible to increase the tension of the crossover wires routed along the outer peripheral surface 312 of the outer wall portion 310 without reducing the strength of the outer wall portion. The shape of the bottom wall 430 can be set as appropriate. In this embodiment, when the cover 400 is attached to the second resin bobbin, as viewed from one axial side (the opposite side to the stator core 100), a part of the winding portion 131 is covered by the bottom wall 430 radially outward from the inner circumferential wall 420, and another part of the winding portion 131 is exposed radially inward from the inner circumferential wall 420. This prevents interference with a jig when assembling the stator 10 to the compressor. It also improves the cooling effect of the winding portion 131. Attaching cover 400 to second resin bobbin 300 restricts movement along the axial direction of interphase insulating member 170. In Figure 18, cover 400 restricts movement of interphase insulating member 170 toward the other axial direction (downward in Figure 18).

[0047] Of course, this embodiment can also use an interphase insulating member 170 whose length along the axial direction is set to a length that does not protrude from the first resin bobbin 200 or the second resin bobbin 300 to the side opposite the stator core 100. In this case, for example, when interphase insulating member 170 is inserted from the second resin bobbin 300 side to a position where it abuts against first movement restricting surface 231 or second movement restricting surface 241 formed on inner wall 220 of first resin bobbin 200, interphase insulating member 170 elastically returns to its original position so as to increase the distance between first end 171 and second end 174. As a result, movement of interphase insulating member 170 in one axial direction is restricted by first movement restricting surface 231 or second movement restricting surface 241 formed on inner wall 220 of first resin bobbin 200, and movement in the other axial direction is prevented by third movement restricting surface 331 (not shown) or fourth movement restricting surface 341 (not shown) formed on inner wall 320 of second resin bobbin 300. In this case, cover 400 for restricting movement of interphase insulating member 170 can be omitted. On the other hand, even in such a case, by attaching the cover 400 to the second resin bobbin 300, it is possible to prevent the jumper wires wired on the outer surface 312 of the outer wall portion 310 of the second resin bobbin 300 from coming into contact with other components.

[0048] When the stator winding 130 is configured from first to third star-connected stator winding portions (for example, U-phase to W-phase stator winding portions), the ends of the first to third stator winding portions on the neutral point connection side are commonly connected and joined by welding or the like. In this case, the common connection portion (neutral point) is covered with an insulating member and routed around the circumferential direction within the recess 200a of the resin bobbin. However, even when covered with an insulating member, contact between the common connection portion and other conductors may damage other components such as conductors. In this embodiment, the common connection part (neutral point) covered with an insulating member is arranged in a special way to prevent damage to other components caused by the common connection part.

[0049] An example of the arrangement of the common connection portion is shown in FIG. The first to third phase stator winding portions have one end connected to a power supply (power supply side lead wire) and the other end connected to a neutral point (neutral point side lead wire). Only neutral point side leads 130Ub, 130Vb, and 130Wb of the first to third phase (U phase to W phase) stator winding portions are shown in Fig. 20. The power supply lead wire is covered with an insulating member and routed circumferentially around one axial side of the stator winding 130 (more specifically, the winding portion 131) within the recess 200a of the first resin bobbin 200. Note that Fig. 20 only shows insulating members 160U and 160V covering the U-phase and V-phase power supply lead wires; the insulating member covering the W-phase power supply lead wire is hidden and therefore not shown. As the insulating members 160U and 160V, for example, insulating tubes having insulating properties are used. The neutral point side lead wires 130Ub to 130Wb are connected in common and joined by thermal welding or the like to form a common connection part (neutral point). The common connection part is covered with an insulating member 140. The insulating member 140 is formed, for example, as shown in FIG. 19, from a resin film 150 having insulating properties. First, resin film 150 having insulating properties is wound into a cylindrical shape. Then, the locations indicated by arrows 151 and 152 are joined using ultrasonic welding or the like. This results in insulating member 140, which is a cylindrical body having joint 141 on one end and opening 140a on the other end. Then, the common connection portion is inserted into the insulating member 140 through the opening 140a. Furthermore, the common connection part covered with insulating member 140 is attached to at least one of the insulating members covering the power supply lead wires. For example, in a state where it is placed on insulating member 160 covering the U-phase to W-phase power supply lead wires (only insulating members 160U and 160V are shown in FIG. 19), insulating member 140 and insulating member 160 covering the U-phase to W-phase power supply lead wires are tied together with tying string 180. In this case, by utilizing thin-walled portion 215 and communication hole 216 shown in FIG. 13 described above, tying string 180 can be prevented from protruding outside outer circumferential surface 212 of outer wall portion 210.

[0050] Another example of the layout of the neutral point side lead wire is shown in FIG. One-side ends (power supply side lead wires) 130Ua to 130Wa are routed around the inside of the recess 200a of the first resin bobbin 200 in the circumferential direction while being covered with insulating members 160U to 160W. The other ends (neutral point side lead wires 130Ub to 130Wb) are joined together to form a common connection part, which is covered with an insulating member 140 and disposed between the winding parts wound around the circumferentially adjacent teeth 112. In addition, when an interphase insulating member 170 is arranged between the winding portions wound around circumferentially adjacent teeth 112, the common connection portion can also be arranged between the interphase insulating members 170. With the above-described configuration, it is possible to prevent damage to the conductors or the like due to contact of the common connecting portion with the conductors or the like.

[0051] In the electric motor or compressor of the first embodiment, the end processing is performed on the side of the first resin bobbin 200 arranged on the stator core end face on one side of the axial direction of the stator core, and the wiring processing of the jumper wire is performed on the side of the second resin bobbin 300 arranged on the stator core end face on the other side of the axial direction, but this is not limited to this. A second embodiment of the electric motor of the present invention is shown in FIGS. The electric motor of the second embodiment is composed of a stator core 500, a first resin bobbin 600 arranged on the stator core end face on one axial side of the stator core 500, a second resin bobbin 700 arranged on the stator core end face on the other axial side of the stator core 500, and a cover 800 attached to the first resin bobbin 600. In this embodiment, end processing and wiring of crossover wires are performed on the side of the first resin bobbin 600 arranged on the stator core end face on one axial side of the stator core 500. That is, in this embodiment, the configuration of the second resin bobbin 300 for wiring the crossover wires in the first embodiment (removed notches and guide grooves) is provided on the first resin bobbin 600. The specific operation is the same as in the first embodiment, and therefore a description thereof will be omitted.

[0052] The present invention is not limited to the configurations described in the embodiments, and various modifications, additions, and deletions are possible. The first and second resin bobbins are not limited to the first and second resin bobbins described in the embodiment. For example, the materials and shapes of the first and second resin bobbins can be changed as appropriate. The inner wall protrusions may be provided on both the inner wall of the first resin bobbin and the inner wall of the second resin bobbin, or on only one of them. Furthermore, the hollowed-out notches and guide grooves may be provided on both the outer wall of the first resin bobbin and the outer wall of the second resin bobbin, or on the outer wall of at least one of the resin bobbins. Although the first and second insertion guide grooves are formed in the second resin bobbin, the first and second insertion guide grooves may be omitted. Although first to fourth inner wall protrusions are provided, the number of inner wall protrusions can be changed as appropriate. For example, only the first and second inner wall protrusions can be provided, or only the third and fourth inner wall protrusions can be provided. Furthermore, the inner wall protrusions can be omitted. The slot insulating members are not limited to the slot insulating members described in the embodiment, and for example, the material and shape of the slot insulating members can be changed as appropriate. The interphase insulating members are not limited to the interphase insulating members described in the embodiment, and for example, the material and shape of the interphase insulating members can be changed as appropriate. The cover is not limited to the cover described in the embodiment. For example, the material and shape of the cover can be changed as appropriate. Also, the cover can be omitted. Each of the configurations and components described in the embodiments can be used alone or in combination with an appropriately selected number of components. The present invention can be configured as a stator, an electric motor including the stator, and a compressor using the electric motor as a drive source. [Explanation of symbols]

[0053] 10, 20 stator 100, 500 stator core 100a, 500a Stator core inner space 100A, 100B, 500A, 500B Stator core end face 111 York 111a Inner surface of yoke 112 Teeth 113 Teeth base 113a, 113b Teeth base side (teeth side) 114 Teeth tip 114A, 114B Teeth protrusion 114a Inner peripheral surface of tooth tip 114b, 114c Teeth tip outer circumferential surface 120 Slot insulating member 120a~120d Edge 120A~120D Bending line 121, 122 End 122, 124 Middle section 125 Central part 130 stator winding 130Ub, 130Ub, 130Wb Other end of the stator winding (neutral point end) 131 Winding part 132 Conductor 132a Winding start line 132b End of winding line 140 Insulating material 140a opening 141 Joint 150 insulating film 160U, 160V insulating material 170 Interphase insulating material 170a~170d Edge 170A~170C Bending line 171, 174 End 172, 173 central part 180 Binding Cord 200, 300, 600, 700 Resin bobbin 200a, 300a recess 210, 310, 610 External wall part 211, 311 Inner surface 212, 312 outer surface 212m, 221m, 312m, 321m slope 213 Groove 213a, 213b side wall 213c bottom wall 215 Thin-walled section 216 Communication hole 220, 320, 620 inner wall 221, 321 Inner surface 222, 322 outer surface 230, 240, 330, 340 Tsuba section 231, 241, 331, 341 Movement restriction surface (axial movement restriction surface) 232, 242, 332, 342 outer surface 233, 243, 333, 343 Inner wall protrusion 233a, 243a, 333a, 343a End face (radial movement restriction surface) 233b, 243b, 333b, 343b side 230a, 240a, 330a, 340a Recesses 230b, 240b, 330b, 340b recesses 250, 350 connection part 250A, 350A Resin bobbin end face 251, 351 top surface 252, 253, 352, 353 Side 254, 255, 354, 355 groove 254a, 354a protrusion 256, 257, 356, 357 Step surface 315A~315C, 615A~615C guide groove 316, 316A~316C, 616A~616C Notch 316a, 316b side wall 316c bottom wall 360, 660 Engagement recess 361 Engagement recess forming surface (engagement surface) 400, 800 cover 400a recess 410 Peripheral wall 420 Inner wall 430 bottom wall 431 Communication hole 440 Locking piece 441 Nails

Claims

1. A rotor and a stator, the stator includes a stator core, a stator winding, and a plurality of insulating members; The stator core has an annular yoke centered on the axis of the stator core, a plurality of teeth extending radially inward from the yoke, and a plurality of slots defined by the yoke and a pair of adjacent teeth, and the teeth have a pair of tooth protrusions protruding to one circumferential side and the other circumferential side at a tip end portion opposite the yoke, the stator winding is configured by a multi-phase stator winding portion having a plurality of winding portions, and the plurality of winding portions have a plurality of winding portions wound around a plurality of the teeth of the stator core, The plurality of insulating members include a plurality of sheet-shaped first insulating members that insulate the yoke and the pair of teeth from the winding portions wound around each of the pair of teeth, and a plurality of sheet-shaped second insulating members that insulate the winding portions wound around each of the pair of teeth. An electric motor, the first insulating member has a main body portion disposed from an inner peripheral surface of the yoke defining the slot to side surfaces of each of the pair of teeth, and a pair of first end portions formed by bending both ends of the main body portion so as to approach each other, the second insulating member has an interphase insulating portion disposed between the winding portions wound around each of the pair of teeth, and a pair of second end portions formed by bending both ends of the interphase insulating portion so as to be apart from each other, the tooth protrusion, the second end, and the first end are arranged in this order from a radially inner side to a radially outer side so as to overlap one another in the radial direction, the stator has a first resin bobbin arranged on a stator core end face on one axial side of the stator core, and a second resin bobbin arranged on a stator core end face on the other axial side of the stator core, the first resin bobbin and the second resin bobbin have an outer wall portion that extends in a circumferential direction and faces the yoke, and a plurality of extension portions that extend radially inward from the outer wall portion and face the plurality of teeth, the plurality of extension portions of the first resin bobbin have, at their tip ends opposite the outer wall portion, first movement regulating portions that protrude toward one side in the circumferential direction and face the slots that are arranged on the one side in the circumferential direction from the extension portions, and second movement regulating portions that protrude toward the other side in the circumferential direction and face the slots that are arranged on the other side in the circumferential direction from the extension portions, the plurality of extension portions of the second resin bobbin have, at their tip ends opposite the outer wall portion, third movement regulating portions that protrude toward one side in the circumferential direction and face the slots that are arranged on the one side in the circumferential direction from the extension portions, and fourth movement regulating portions that protrude toward the other side in the circumferential direction and face the slots that are arranged on the other side in the circumferential direction from the extension portions, the first movement restricting portion has a first inner wall protruding portion protruding toward the stator core along the axial direction, the second movement restricting portion has a second inner wall protruding portion protruding toward the stator core along the axial direction, a bent portion between the main body portion and one of the pair of first end portions of the first insulating member is disposed radially inward of the first inner wall protruding portion, a bent portion between the main body portion of the first insulating member and the other of the pair of first end portions is disposed radially inward of the second inner wall protruding portion, The first inner wall protrusion and the second inner wall protrusion are configured to restrict radially outward movement of the first insulating member. An electric motor characterized by:

2. 2. The electric motor according to claim 1, a distance between the tooth protrusion of the tooth and the first end of the first insulating member increases toward another tooth adjacent to the tooth; the second end of the second insulating member is disposed within a region defined by the tooth protrusion of the tooth and the first end of the first insulating member. An electric motor characterized by:

3. 3. The electric motor according to claim 1 or 2, the first movement restricting portion has a first axial movement restricting surface facing the slot, the second movement restricting portion has a second axial movement restricting surface facing the slot, the third movement restricting portion has a third axial movement restricting surface facing the slot, the fourth movement restricting portion has a fourth axial movement restricting surface facing the slot, The first axial movement restricting surface and the second axial movement restricting surface restrict movement of the second insulating member toward one side in the axial direction, and the third axial movement restricting surface and the fourth axial movement restricting surface restrict movement of the second insulating member toward the other side in the axial direction. An electric motor characterized by:

4. The electric motor according to any one of claims 1 to 3, The extension portions of the first resin bobbin and the second resin bobbin have a top surface located on the opposite side of the teeth along the axial direction, and a pair of side surfaces located on one circumferential side and the other circumferential side of the top surface, facing the side surface on the one circumferential side and the side surface on the other circumferential side of the teeth, respectively, and a plurality of grooves are formed at the connection portion between the top surface and at least one of the pair of top surfaces to allow the winding portion to be wound in an aligned manner. An electric motor characterized by:

5. 5. The electric motor according to claim 4, The plurality of grooves are formed by a plurality of protrusions extending parallel to one another from the top surface to at least one of the side surfaces along the winding direction, and at least one end of the protrusions in the winding direction is chamfered. An electric motor characterized by:

6. 6. The electric motor according to claim 4 or 5, the first resin bobbin and the second resin bobbin have a plurality of inner wall portions disposed radially inward from the outer wall portion, extending in a circumferential direction, and connected to the outer wall portion by the extending portions; a step portion protruding in the axial direction to the opposite side from the teeth is formed at least one between the top surface and the inner peripheral surface of the outer wall portion and between the top surface and the outer peripheral surface of the inner wall portion; An electric motor characterized by:

7. A compressor including a compression mechanism that compresses a cooling medium and an electric motor that drives the compression mechanism, A compressor, characterized in that the electric motor according to any one of claims 1 to 6 is used as the electric motor.

Images