Electric motors and compressors

Abstract

To provide an electric motor capable of preventing movement in a radial direction of an inter-phase insulation member.SOLUTION: A first resin bobbin provided on one side in an axial direction of a stator core has a first flange part 230 and a second flange part 240 projecting to one side in a circumferential direction and the other side in the circumferential direction, at the tip of a connection part 250. The first flange part and the second flange part have a first axial direction movement regulating surface 231 and a second axial direction movement regulating surface 241 for regulating movement of an inter-phase insulation member to one side. A second resin bobbin provided on the other side has a third flange part 330 and a fourth flange part 340 projecting to the one side and the other side, at the tip of a connection part 350. The third flange part and the fourth flange part have a third axial direction movement regulating surface 331 and a fourth axial direction movement regulating surface 341 for regulating movement of the inter-phase insulation member to the other side. The first flange part and the second flange part have a first end face 233a and a second end face 243a for regulating movement of the inter-phase insulation member to the radial outside.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an electric motor and a compressor having the electric motor as a drive source.

Background Art

[0002] In vehicles such as hybrid vehicles (HV), electric vehicles (EV), and fuel cell vehicles (FCV), which are called eco-cars, a compressor (referred to as an "electric compressor") that drives a compression mechanism by an electric motor is used as an air conditioner compressor. In recent years, with the increase in the high voltage of the vehicle power supply voltage, electric motors used in electric compressors are also required to be of high voltage specifications. For example, the development of technologies such as ensuring an insulation distance between components and preventing contact between components is required. As an electric motor that drives a compression mechanism, for example, a stator (referred to as a "concentrated winding type stator") in which a conductor constituting a stator winding is wound around teeth of a stator core with resin bobbins arranged on both axial sides of the stator core is provided. The conductor is composed of, for example, a conductor such as copper or aluminum and an insulating film having insulating properties that covers the outer periphery of the conductor. The stator winding is composed of a plurality of stator winding portions of a plurality of phases having a plurality of winding portions. The winding portion has a winding portion wound around the teeth. Normally, a slot insulation member is provided to prevent insulation failure between the conductor and the stator core. The slot insulation member is arranged to extend along the inner periphery of the slot in a slot defined by a yoke and two adjacent teeth in the circumferential direction. In addition, winding portions wound around each of the two teeth (adjacent teeth in the circumferential direction) that partition the slot constitute stator winding portions of different phases. Therefore, a phase insulation member is provided to prevent insulation failure between winding portions of different phases. The phase insulation member is arranged between winding portions wound around each of the two teeth forming the slot. An electric motor comprising a stator equipped with slot insulating members and interphase insulating members is disclosed, for example, in Patent Document 1 (Japanese Patent Application Publication No. 2008-42959). In the electric motor disclosed in Patent Document 1, the interphase insulating member has an interphase insulating portion and a pair of ends formed by bending both ends of the interphase insulating portion so as to be separated from each other. The interphase insulating portion is positioned between the winding portions of different phases. The pair of ends are positioned between the tooth protrusions of the teeth and the flange portion of the resin bobbin. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2008-42959 [Overview of the project] [Problems that the invention aims to solve]

[0004] In the electric motor disclosed in Patent Document 1, the movement of the interphase insulating member along the axial direction is restricted, but its movement along the radial direction is not restricted. On the other hand, in recent high-voltage electric motors, there is a risk of insulation failure due to radial movement of the interphase insulating material. This invention was conceived in view of these points, and aims to provide an electric motor that can restrict the radial movement of the interphase insulating member. [Means for solving the problem]

[0005] The first invention relates to an electric motor. The electric motor of the first invention comprises a stator and a rotor rotatably disposed relative to the stator. Various known rotor configurations can be used as the rotor. The stator comprises a stator core, multiple resin bobbins, an insulating member, and a stator winding. The stator core is formed in a cylindrical shape from, for example, laminated electrical steel sheets. The stator core has a yoke, a plurality of teeth, and a plurality of slots. The yoke extends circumferentially around the axis of the stator core. The teeth extend radially inward from the yoke. The slots are formed by the yoke and adjacent pairs of teeth. The multiple resin bobbins include a first resin bobbin provided on one axial side of the stator core and a second resin bobbin provided on the other axial side. The first and second resin bobbins are formed from, for example, a resin having insulating properties. The first and second resin bobbins have an outer wall portion and a plurality of extending portions. The outer wall portion extends in the circumferential direction. along It extends and faces the yoke. The extended portion extends radially inward from the outer wall portion and faces the teeth. The description "a first resin bobbin and a second resin bobbin provided on one axial side and the other axial side of the stator core" includes two embodiments: one in which "a first resin bobbin and a second resin bobbin, formed separately from the stator core, are arranged on one axial side and the other axial side of the stator core" and another in which "the first resin bobbin and the second resin bobbin are integrally molded with the stator core on one axial side and the other axial side of the stator core." Known methods, such as insert molding, can be used to integrally mold the first resin bobbin and the second resin bobbin with the stator core. The stator winding has a winding portion that is wound around the teeth of the stator core, the extended portion of the first resin bobbin, and the extended portion of the second resin bobbin. The insulating member is formed, for example, by folding an insulating sheet having insulating properties. The insulating member has an interphase insulating portion, First end and second end It has the following characteristics: The interphase insulation portion is located between the winding portions of different phases, which are wound around an adjacent pair of teeth. First end and second end These are formed by bending the ends of the interphase insulating section so that they are separated from each other. The extended portion of the first resin bobbin has a first flange protruding to one side in the circumferential direction and a second flange protruding to the other side in the circumferential direction at the tip opposite to the outer wall portion. The first flange is located in the slot It faces and extends along the radial and circumferential directions. It has a first axial movement restricting surface, and the second flange portion is in the slot It faces and extends along the radial and circumferential directions. It has a second axial movement restricting surface. Furthermore, the extended portion of the second resin bobbin has a third flange protruding to one side in the circumferential direction and a fourth flange protruding to the other side in the circumferential direction at the tip opposite to the outer wall portion. The third flange is located in the slot. It faces and extends along the radial and circumferential directions. It has a third axial movement restricting surface, and the fourth flange portion is in the slot It faces and extends along the radial and circumferential directions. It has a fourth axial movement restricting surface. The first and second axial movement restricting surfaces restrict the movement of the insulating member to one side in the axial direction, and the third and fourth axial movement restricting surfaces restrict the movement of the insulating member to the other side in the axial direction. For example, the movement of the interphase insulating member along the axial direction is restricted when the interphase insulating member comes into contact with the first to fourth axial movement restricting surfaces. In this invention, The extended portion of the first resin bobbin has a side surface on one side in the circumferential direction and a side surface on the other side in the circumferential direction. The first guard portion is, It has a first inner wall projection that protrudes to the other side in the axial direction. The first inner wall projection has a first radial movement restricting surface extending along the axial and circumferential directions on one of the radially outer and radially inner sides of the first axial movement restricting surface, and a side surface extending along the axial and radial directions on the other circumferential side. A first movement-restricting recess is formed by the circumferential side surface of the extended portion of the first resin bobbin, the first axial movement-restricting surface of the first flange portion, and the first radial movement-restricting surface of the first inner wall projection portion. A recess is formed by the circumferential side surface of the extended portion of the first resin bobbin and the side surface of the first inner wall projection, with the other side in the axial direction, the radially inward, and the radially outward being open. Furthermore, the second guard portion is, It has a second inner wall projection that protrudes to the other side in the axial direction. The second inner wall projection has a second radial movement restricting surface extending along the axial and circumferential directions on one of the radially outer and radially inner sides of the second axial movement restricting surface, and a side surface extending along the axial and radial directions on one side in the circumferential direction. A second movement-restricting recess is formed by the circumferential side surface of the extended portion of the first resin bobbin, the second axial movement-restricting surface of the second flange portion, and the second radial movement-restricting surface of the second inner wall projection portion. The other circumferential side surface of the extended portion of the first resin bobbin and the side surface of the second inner wall projection form a recess that is open on the other axial side, the radially inward side, and the radially outward side. Preferably, the arrangement relationship between the second radial movement restricting surface and the second axial movement restricting surface is set in the same way as the arrangement relationship between the first radial movement restricting surface and the first axial movement restricting surface. For example, if the first radial movement restricting surface is arranged radially outward from the first axial movement restricting surface, the second radial movement restricting surface is arranged radially outward from the second axial movement restricting surface. The first and second ends of the insulating member are positioned within adjacent second and first movement-restricting recesses, respectively. Furthermore, the first radial movement restricting surface and the second radial movement restricting surface restrict the radial movement of the insulating member. For example, if the first radial movement restricting surface is located radially outside the first axial movement restricting surface, and the second radial movement restricting surface is located radially outside the second axial movement restricting surface, then the radial outward movement of the insulating member is restricted. The radial movement of the insulating member is restricted by the insulating member directly or indirectly contacting the first radial movement restricting surface or the second radial movement restricting surface. The electric motor of the first invention can restrict the radial movement of the insulating member, thereby preventing insulation failure caused by radial movement of the insulating member. In a different embodiment of the first invention, the first radial movement restricting surface is provided radially outward of the first axial movement restricting surface. And the circumferential side surface of the extended portion of the first resin bobbin and First flange First axial movement restricting surface and the first inner wall protrusion First radial movement restricting surface and, This forms a first movement-restricting recess that is open on the other side in the axial direction, one side in the circumferential direction, and the radially inward side. Furthermore, the second radial movement restricting surface is provided radially outward from the first axial movement restricting surface. And the other circumferential side surface of the extended portion of the first resin bobbin, Second flange Second axial movement restricting surface And the second inner wall protrusion Second radial movement restricting surface and, This creates a second movement-restricting recess that is open on the other side in the axial direction, the other side in the circumferential direction, and the radially inward side. The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the radial outward movement of the insulating member. For example, the insulating member First end and second end The device is configured such that one end is positioned within a first movement-restricting recess and the other end is positioned within a second movement-restricting recess. In this case, the first radial movement-restricting surface restricts the radially outward movement of one end, and the second radial movement-restricting surface restricts the radially outward movement of the other end. In this form, with a simple structure, the movement of the insulating member in the radial direction outward can be restricted. In a different form of the first invention, the first radial movement restricting surface is provided on the radially inner side of the first axial movement restricting surface. And, between the side surface on one circumferential side of the extending portion of the first resin bobbin and First flange the first axial movement restricting surface and the first inner wall protrusion the first radial movement restricting surface and, there is formed a first movement restricting recess that is open on the other axial side, one circumferential side, and the radially outer side. Also, the second radial movement restricting surface is provided on the radially inner side of the second axial movement restricting surface. And, between the side surface on the other circumferential side of the extending portion of the first resin bobbin and Second flange the second axial movement restricting surface And the second inner wall protrusion the second radial movement restricting surface and, there is formed a second movement restricting recess that is open on the other axial side, the other circumferential side, and the radially outer side. The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the movement of the insulating member in the radially inner direction. For example, one of the pair of end portions of the insulating member is arranged in the first movement restricting recess, and the other end portion is arranged in the second movement restricting recess. In this case, the first radial movement restricting surface restricts the movement of one end portion in the radially inner direction, and the second radial movement restricting surface restricts the movement of the other end portion in the radially inner direction. In this form, with a simple structure, the movement of the insulating member in the radially inner direction can be restricted. In a different form of the first invention, The extended portion of the second resin bobbin has a side surface on one side in the circumferential direction and a side surface on the other side in the circumferential direction. The third flange portion It has a third inner wall projection that protrudes to one side in the axial direction. The third inner wall projection is, has a third radial movement restricting surface that extends along the axial direction and the circumferential direction on the radially outer side of the third axial movement restricting surface. It has a surface that extends along the axial and radial directions on the other side in the circumferential direction. And, between the side surface on one circumferential side of the extending portion of the second resin bobbin and the third axial movement restricting surface Third flange the third radial movement restricting surface And the third inner wall protrusion and, ​This creates a third movement-restricting recess that is open on one side in the axial direction, one side in the circumferential direction, and the radially inward side. A recess is formed by the circumferential side surface of the extended portion of the second resin bobbin and the side surface of the third inner wall projection, with openings on one side in the axial direction, the radially inward, and the radially outward. Furthermore, the fourth guard portion is, It has a fourth inner wall projection that protrudes to one side in the axial direction. The fourth inner wall projection is, A fourth radial movement restricting surface extends radially outward from the fourth axial movement restricting surface, along the axial and circumferential directions. It has a surface that extends along the axial and radial directions on one side in the circumferential direction. I have it. And the other side surface in the circumferential direction of the extended portion of the second resin bobbin, The fourth flange Fourth axial movement restricting surface And the fourth inner wall protrusion Fourth radial movement restricting surface and, This forms a fourth movement-restricting recess that is open on one side in the axial direction, the other side in the circumferential direction, and the radially inward side. The first and second ends of the insulating member are positioned within adjacent fourth and third movement-restricting recesses, respectively. The first to fourth radial movement restricting surfaces are configured to restrict the radial movement of the insulating member. In this embodiment, the radial movement of the interphase insulating member can be more reliably restricted. In a different embodiment of the first invention, the length of the insulating member along the axial direction is set to be longer than the length between the first resin bobbin and the second resin bobbin, which are provided on both sides of the stator core in the axial direction. The stator further includes a cover that can be detachably attached to a second resin bobbin. A cover attached to the second resin bobbin restricts the movement of the insulating member to the other side in the axial direction. For example, the movement of the interphase insulating member to the other side in the axial direction is restricted by the interphase insulating member coming into contact with the cover. In this embodiment, an insulating member with a long length along the axial direction can be used, thereby increasing the insulation distance along the axial direction. In a different embodiment of the first invention, the third flange portion is located at one end in the circumferential direction, in the axial direction. along It continues, ThirdIt has a first insertion guide groove that opens to the axial movement restricting surface. The first insertion guide groove is open on one side in the circumferential direction, one side in the axial direction, and the other side in the axial direction. The fourth flange portion has an opening at the end on the other side in the circumferential direction, in the axial direction along It has a second insertion guide groove that extends and opens to the fourth axial movement restricting surface. The second insertion guide groove is open on the other side in the circumferential direction, one side in the axial direction, and the other side in the axial direction. In this embodiment, the insulating member is inserted into the slot guided by the first insertion guide groove and the second insertion guide groove. For example, the insulating member First end and second end One end is inserted into the slot guided by a first insertion guide groove, and the other end is inserted into the slot guided by a second insertion guide groove. In this embodiment, the insulating member can be easily inserted into the slot. The second invention relates to an electric motor. The extended portion of the first resin bobbin, which is provided on one axial side of the stator core, has a first flange portion projecting to one side in the circumferential direction and a second flange portion projecting to the other side in the circumferential direction at the tip opposite to the outer wall portion. The extended portion of the second resin bobbin, located on the other axial side of the stator core, has a third flange protruding to one side in the circumferential direction and a fourth flange protruding to the other side in the circumferential direction at its tip opposite to the outer wall. The extended portion of the first resin bobbin has a side surface on one side in the circumferential direction and a side surface on the other side in the circumferential direction. The first flange is in the slot It faces and extends along the radial and circumferential directions. It has a first axial movement restricting surface, and also, It has a first inner wall projection that protrudes to the other side in the axial direction. The first inner wall projection is, On one of the radially outer and radially inner sides of the first axial movement restricting surface, the first radial movement restricting surface extends along the axial and circumferential directions. It has a surface that extends in the axial and radial directions on the other side in the circumferential direction. I have it. A first movement-restricting recess is formed by the circumferential side surface of the extended portion of the first resin bobbin, the first axial movement-restricting surface of the first flange portion, and the first radial movement-restricting surface of the first inner wall projection portion. A recess is formed by the circumferential side surface of the extended portion of the first resin bobbin and the side surface of the first inner wall projection, with the other side in the axial direction, the radially inward, and the radially outward being open. The second flange is in the slot It faces and extends along the radial and circumferential directions. It has a second axial movement restricting surface, Furthermore, it has a second inner wall projection that protrudes to the other side in the axial direction. The second inner wall projection is, On one of the radially outer and radially inner sides of the second axial movement restricting surface, a second radial movement restricting surface extending along the axial and circumferential directions is provided. It has a surface that extends in the axial and radial directions on one side in the circumferential direction. I have it. A second movement-restricting recess is formed by the circumferential side surface of the extended portion of the first resin bobbin, the second axial movement-restricting surface of the second flange portion, and the second radial movement-restricting surface of the second inner wall projection portion. The insulating member has an interphase insulating portion positioned between a winding portion wound around a pair of teeth, and a first end and a second end formed by bending both ends of the interphase insulating portion so as to be separated from each other. The first end and the second end of the insulating member are positioned in adjacent second and first movement-restricting recesses, respectively. The length of the insulating member along the axial direction is set to be longer than the distance between the first resin bobbin and the second resin bobbin, which are located on both sides of the stator core in the axial direction. The stator further includes a cover that can be detachably attached to a second resin bobbin. The first axial movement restricting surface and the second axial movement restricting surface of the first resin bobbin restrict the movement of the insulating member to one side in the axial direction, and the cover attached to the second resin bobbin restricts the movement of the insulating member to the other side in the axial direction. Also, The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the radial movement of the insulating member. The electric motor of the second invention can increase the insulation distance along the axial direction, and can prevent insulation failures caused by the movement of the insulating member along the axial direction and along the radial direction. The third invention relates to a compressor. The compressor of the third invention comprises a compression mechanism for compressing a cooling medium and an electric motor for driving the compression mechanism. The electric motor used is one of the electric motors described above. Various known compression mechanisms can be used as the compression mechanism for compressing the cooling medium. The compressor of the third invention has the same effect 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 failures caused by radial movement of the insulating member. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of a stator constituting the first embodiment of the electric motor of the present invention. [Figure 2] Figure 1 is a perspective view showing the stator with the cover removed. [Figure 3] This is a perspective view of the first resin bobbin that constitutes the stator used in the electric motor of the first embodiment. [Figure 4] This is a perspective view of the second resin bobbin that constitutes the stator used in the electric motor of the first embodiment. [Figure 5] This diagram shows the arrangement relationship between the stator core, slot insulating member, phase insulating member, and resin bobbin in the stator used in the electric motor of the first embodiment. [Figure 6] This is a perspective view of the main part of the first resin bobbin that constitutes the stator used in the electric motor of the first embodiment. [Figure 7] This is a cross-sectional view of the first resin bobbin, which constitutes the stator used in the electric motor of the first embodiment. [Figure 8] This is a diagram showing the wrapping section. [Figure 9] This figure shows the inner wall portion of the second resin bobbin that constitutes the stator used in the electric motor of the first embodiment. [Figure 10] This is a cross-sectional view of the portion of the outer wall of the second resin bobbin, which constitutes the stator used in the electric motor of the first embodiment, corresponding to the notch. [Figure 11] This is a perspective view of the slot insulating member that constitutes the stator used in the electric motor of the first embodiment. [Figure 12] This is a perspective view of the phase-to-phase insulating member that constitutes the stator used in the electric motor of the first embodiment. [Figure 13] This diagram illustrates the process of inserting the interphase insulating member into the slot. [Figure 14] This diagram illustrates the process of inserting the interphase insulating member into the slot. [Figure 15] A perspective view of the cover constituting the stator used in the electric motor of the first embodiment. [Figure 16] This is a perspective view of the cover that constitutes the stator used in the electric motor of the first embodiment, seen from the back. [Figure 17] This figure shows the locking piece of the cover that constitutes the stator used in the electric motor of the first embodiment. [Figure 18] This diagram illustrates the mounting mechanism for attaching the cover to the second resin bobbin. [Figure 19] This is a perspective view showing the cover attached to the second resin bobbin. [Figure 20] This diagram shows an insulating material covering the neutral point. [Figure 21] This figure shows an example of a method for arranging an insulating material to cover the neutral point. [Figure 22] This figure shows different examples of how to arrange insulating material to cover the neutral point. [Figure 23] This figure shows the inner wall portion of the first modified resin bobbin. [Figure 24] This is a perspective view of a stator used in a second embodiment of the electric motor of the present invention. [Figure 25] Figure 24 is a perspective view showing the stator with the cover removed. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described below 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 rotational centerline of the rotor when the rotor is rotatably positioned on the stator. Furthermore, when viewed from one side in the axial direction, the circumferential direction centered on axis P is called the "circumferential direction." Furthermore, when viewed from one side in the axial direction, the direction in which a line passing through axis P extends is called the "radial direction." The term "inside radial direction" refers to the side of axis P along the radial direction, while the term "outside radial direction" refers to the side opposite axis P along the radial direction. Furthermore, for the resin bobbins (first resin bobbin, second resin bobbin), slot insulating members, interphase insulating members, and covers, the descriptions "axial direction," "circumferential direction," and "radial direction" refer to the "axial direction," "circumferential direction," and "radial direction" when they are arranged in the stator core. Furthermore, in the following, in Figures 1 and 2, the upper part of the paper will be referred to as "one side in the axial direction," and the lower part of the paper will be referred to as "the other side in the axial direction." Furthermore, when viewed from above the paper in Figures 1 and 2, the clockwise direction is referred to as "one side of the circumferential direction" and the counterclockwise direction is referred to as "the other side of the circumferential direction," with axis P as the center. Of course, "one side in the axial direction," "the other side in the axial direction," "one side in the circumferential direction," and "the other side in the circumferential direction" can be in opposite directions.

[0009] The stator 10, which constitutes the first embodiment of the electric motor of the present invention, will be described with reference to Figures 1 and 2. Figure 1 is a perspective view of the stator 10. Figure 2 is a perspective view of the stator 10 with the cover removed. The stator 10 consists 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. In the stator 10 constituting the electric motor of the first embodiment, the first resin bobbin 200 and the second resin bobbin 300 are formed separately from the stator core 100.

[0010] The stator core 100 is constructed by laminating electrical steel sheets. The stator core 100 has a cylindrical shape, with 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. The stator core 100 has a yoke 111, a plurality of teeth 112, and a plurality of slots 115, as shown in Figure 5, which is a view from one side in the axial direction. The yoke 111 extends along the circumferential direction. In this embodiment, the yoke 111 is formed in an annular shape. Multiple teeth 112 are spaced apart along the circumferential direction and extend radially inward from the yoke 111. Each tooth 112 has a tooth base 113 that extends radially inward from the yoke 111 and a tooth tip 114 that is provided at the tip of the tooth base 113 and extends along the circumferential direction. The 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 an inner circumferential surface 114a on the radially inward side, a first outer circumferential surface 114b on the radially outward side and on one side in the circumferential direction, and a second outer circumferential surface 114c on the radially outward side and on the other side in the circumferential direction. The tooth tip portion 114 has a first tooth projection 114A that protrudes from the tooth base portion 113 to one side in the circumferential direction and a second tooth projection 114B that protrudes to the other side in the circumferential direction. The first tooth projection 114A is formed by the inner circumferential surface 114a of the tooth tip portion and the outer circumferential surface 114b of the first tooth tip portion, and the second tooth projection 114B is formed by the inner circumferential surface 114a of the tooth tip portion and the outer circumferential surface 114c of the second tooth tip portion. In this embodiment, the first tooth projection 114A The second tooth projection 114B corresponds to the "pair of tooth projections" of the present invention. The inner circumferential surface 114a of the tooth tip forms the inner space 100a of the stator core. The rotor is rotatably positioned within the inner space 100a of the stator core. Various known rotor configurations can be used as the rotor.

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

[0012] The slot 115 is defined by two circumferentially adjacent teeth 112 and a yoke 111. The slot 115 is defined by the inner circumferential surface 111a of the yoke 111, the second tooth base side surface 113b and the second tooth tip outer circumferential surface 114c of the tooth 112 on one side in the circumferential direction, and the first tooth base side surface 113a and the first tooth tip outer circumferential surface 114b of the tooth 112 on the other side in the circumferential direction. 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 slot 115. In this embodiment, the slot insulating member 120 shown in Figure 11 is used. The slot insulating member 120 is formed by folding a sheet-like resin film made of a resin having insulating properties. As the resin film, a resin film made of various known resins can be used. Specifically, as shown in Figure 11, the slot insulating member 120 is formed by folding a rectangular insulating film having edges 120a and 120b extending in the axial direction and edges 120c and 120d extending in a direction intersecting the axial direction, along folding lines 120A to 120D. The slot insulating member 120 is divided by the 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. The slot insulating member 120 shown in Figure 11 has a first intermediate portion 122, a central portion 123, and a second intermediate portion 124 that are bent into a roughly U-shape. The first intermediate portion 122, the central portion 123, and the second intermediate portion 124 constitute the main body. In addition, the first end portion 121 and the second end portion 125 are bent so that they are closer to each other, that is, so that they are positioned towards the center of the U-shape. As shown in Figure 5, the slot insulating member 120 has a main body that extends from the inner circumferential surface 111a of the yoke to the side surface 113b of the second tooth base of the tooth 112 on one side in the circumferential direction and the side surface 113a of the first tooth base of the tooth 112 on the other side in the circumferential direction. Furthermore, the first end 121 is positioned to face the outer circumferential surface 114c of the second tooth tip of the tooth 112 on one side in the circumferential direction, and the second end 125 is positioned to face the outer circumferential surface 114b of the first tooth tip of the tooth 112 on the other side in the circumferential direction. When the slot insulating member 120 is inserted into the slot 115, it is bent such 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 side in the circumferential direction increases toward the other side in the circumferential direction. Similarly, it is bent such 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 side in the circumferential direction increases toward the one side in the circumferential direction. The first end 121 and the second end 125 correspond to the "pair of ends of the slot insulating member". In Figure 5, the slot insulating member 120 is inserted into the slot 115 such that the first end 121 is positioned on one side in the circumferential direction and the second end 125 is positioned on the other side in the circumferential direction. However, it is also possible to insert the first end 121 into the slot 115 such that the first end 121 is positioned on the other side in the circumferential direction and the second end 125 is positioned on one side in the circumferential direction. In this case, the end portion 121 and the intermediate portion 122 become the second end portion and the second intermediate portion, and the end portion 125 and the intermediate portion 124 become the first end portion and the first intermediate portion.

[0014] The first resin bobbin 200 and the second resin bobbin 300 are arranged on both sides of the stator core 100 in the axial direction. In the first embodiment, the case in which the first resin bobbin 200 is arranged on one side of the stator core 100 in the axial direction and the second resin bobbin 300 is arranged on the other side in the axial direction will be described. 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 formed from a resin having insulating properties.

[0015] As shown in Figure 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 along the circumferential and axial directions. The outer wall portion 210 is positioned to face the yoke 111 of the stator core 100. The inner wall portion 220 is positioned radially inward from the outer wall portion 210 and extends along the circumferential and axial directions. The connecting portion 250 extends along the circumferential and radial directions, connecting the outer wall portion 210 and the inner wall portion 220. The outer wall portion 250 is positioned to face the teeth 112 (more specifically, the tooth base portion 113) of the stator core 100. As shown in Figures 5 and 6, the inner wall portion 220 has a first flange portion 230 protruding to one side in the circumferential direction and a second flange portion 240 protruding to the other side in the circumferential direction. Figure 6(b) is a perspective view of Figure 6(a) from the direction of arrow b. As shown in Figure 5, the first flange portion 230 protrudes so as to face a slot 115 located on one side in the circumferential direction from the connecting portion 250. The second flange portion 240 protrudes so as to face a slot 115 located on the other side in the circumferential direction from the connecting portion 250.

[0016] The first flange portion 230 has a first movement-restricting surface 231 at the tip opposite to the outer wall portion 210, facing the slot 115 and extending in the circumferential and radial directions, and also has an outer peripheral surface 232 on one side in the circumferential direction. The first movement-restricting surface 231 restricts movement along the axial direction of the interphase insulating member 170. One side Travel to that location will be restricted. Furthermore, the first flange portion 230 has a first inner wall projection 233 that protrudes toward the stator core 100 side (stator core end face 100A side). The first inner wall projection 233 has a first end face 233a extending radially inward in the circumferential and axial directions, and a side surface 233b extending axially and radially on the other circumferential side. The first movement restricting surface 231, the first end face 233a, and the first side surface 252 of the connecting portion 250 form a recess 230a that is open on one side in the circumferential direction, the other side in the axial direction (towards the stator core end face 100A), and the radially inward side. The recess 230a (first movement restricting surface 231, first end face 233a) restricts the movement of the interphase insulating member 170 to one side in the axial direction and to the radially outward direction. Furthermore, the first side surface 252 of the connecting portion 250 and the side surface 233b of the first inner wall projection 233 form a recess 230b that is open on the other side in the axial direction, the radially inward, and the radially outward. In this embodiment, the first flange portion 230 corresponds to the "first movement restricting portion". The first movement restricting surface 231 corresponds to the "first axial movement restricting surface", and the end face 233a corresponds to the "first radial movement restricting surface". The recess 230a corresponds to the "first movement restricting recess".

[0017] The second flange portion 240 has a second movement-restricting surface 241 at the tip opposite to the outer wall portion 210, facing the slot 115 and extending in the circumferential and radial directions, and also has an outer peripheral surface 242 on the other side in the circumferential direction. 241 Therefore, along the axial direction of the interphase insulating member 170 One side Travel to that location will be restricted. Furthermore, the second flange portion 240 has a second inner wall projection 243 that protrudes toward the stator core 100 side (stator core end face 100A side). The second inner wall projection 243 has a second end face 243a extending radially inward in the circumferential and axial directions, and a side surface 243b extending axially and radially on one side in the circumferential direction. The second movement restricting surface 241, the second end face 243a, and the second side surface 253 of the connecting portion 250 form a recess 240a that is open on the other side in the circumferential direction, the other side in the axial direction (towards the stator core end face 100A), and the radially inward side. The recess 240a (second movement restricting surface 241, second end surface 243a) restricts the movement of the interphase insulating member 170 to one side in the axial direction and to the radially outward direction. Furthermore, the second side surface 253 of the connecting portion 250 and the side surface 243b of the second inner wall projection 243 form a recess 240b that is open on the other side in the axial direction, the radially inward, and the radially outward. In this embodiment, the second flange portion 240 corresponds to the "second movement restricting portion". The second movement restricting surface 241 corresponds to the "second axial movement restricting surface", and the end face 243a corresponds to the "second radial movement restricting surface". The recess 240a corresponds to the "second movement restricting recess".

[0018] Furthermore, as shown in Figure 4, the second resin bobbin 300, like the first resin bobbin 200, has an outer wall portion 310, a plurality of inner wall portions 320, and a plurality of connecting portions 350. In this embodiment, the connecting portion 250 of the first resin bobbin 200 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 configuration of the inner wall portion 320 of the second resin bobbin 300 is the same as 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. For this reason, the configuration of the inner wall portion 320 will be explained with reference to Figure 6. In Figure 6, the reference numerals of each element of the second resin bobbin 300 are indicated in parentheses. The outer wall portion 310 extends along the circumferential and axial directions. The outer wall portion 310 is positioned opposite the yoke 111 of the stator core 100. The inner wall portion 320 is positioned radially inward from the outer wall portion 310 and extends along the circumferential and axial directions. The connecting portion 350 extends in the circumferential and radial directions, connecting the outer wall portion 310 and the inner wall portion 320. The outer wall portion 350 is positioned to face the teeth 112 (more specifically, the tooth base portion 113) of the stator core 100. The inner wall portion 320 has a third flange portion 330 protruding to one side in the circumferential direction and a fourth flange portion 340 protruding to the other side in the circumferential direction at the tip opposite to the outer wall portion 310. The third flange portion 330 protrudes so as to face a slot 115 located on one side in the circumferential direction from the connecting portion 350. The second flange portion 340 protrudes so as to face a slot 115 located on the other side in the circumferential direction from the connecting portion 350.

[0019] The third flange portion 330 has a third movement restricting surface 331 at the tip opposite to the outer wall portion 310, facing the slot 115 and extending in the circumferential and radial directions, and also has an outer peripheral surface 332 on one side in the circumferential direction. The third movement restricting surface 331 restricts movement along the axial direction of the interphase insulating member 170. other side Travel to that location will be restricted. Furthermore, the third flange portion 330 has a third inner wall projection 333 that protrudes toward the stator core 100 side (stator core end face 100A side). The third inner wall projection 333 has a third end face 333a extending radially inward in the circumferential and axial directions, and a side surface 333b extending axially and radially on the other side in the circumferential direction. The third movement restricting surface 331, the third end face 333a, and the first side surface 352 of the connecting portion 350 form a recess 330a that is open on one side in the circumferential direction, one side in the axial direction (towards the stator core end face 100B), and the radially inward side. The recess 330a (third movement restricting surface 331, third end surface 333a) of the interphase insulating member 170 Other side in axial direction Movement toward and radially outward is restricted. In this embodiment, the third flange portion 330 corresponds to the "third movement restricting portion". The third movement restricting surface 331 corresponds to the "third axial movement restricting surface", and the end face 333a corresponds to the "third radial movement restricting surface". The recess 330a corresponds to the "third movement restricting recess".

[0020] The fourth flange portion 340 has a fourth movement restricting surface 341 at the tip opposite to the outer wall portion 310, facing the slot 115 and extending in the circumferential and radial directions, and also has an outer peripheral surface 342 on the other side in the circumferential direction. The fourth movement restricting surface 341 restricts movement along the axial direction of the interphase insulating member 170. other side Travel to that location will be restricted. Furthermore, the fourth flange portion 340 has a fourth inner wall projection 343 that protrudes toward the stator core 100 side (stator core end face 100B side). The fourth inner wall projection 343 has a third end face 343a extending radially inward in the circumferential and axial directions, and a side surface 343b extending axially and radially on one side in the circumferential direction. The fourth movement restricting surface 341, the fourth end face 343a, and the second side surface 353 of the connecting portion 350 form a recess 340a that is open on the other side in the circumferential direction, one side in the axial direction (towards the stator core end face 100B), and the radially inward side. The recess 340a (fourth movement restricting surface 341, fourth end surface 343a) of the interphase insulating member 170 Other side in axial direction Movement toward and radially outward is restricted. In this embodiment, as shown by the dashed lines in Figure 6, the third flange portion 330 and the second flange portion 340 of the second resin bobbin 300 have a first insertion guide groove 335 and a second insertion guide groove 345 formed therein. The first insertion guide groove 335 and the second insertion guide groove 345 will be described later. In this embodiment, the fourth flange portion 340 corresponds to the "fourth movement restricting portion" of the present invention. The fourth movement restricting surface 341 corresponds to the "fourth axial movement restricting surface" of the present invention, and the end face 343a corresponds to the "fourth radial movement restricting surface" of the present invention. The recess 340a corresponds to the "fourth movement restricting recess".

[0021] The stator winding 130 is formed by inserting a slot insulating member 120 into the slot 115 of the stator core 100, and arranging a first resin bobbin 200 and a second resin bobbin 300 on both sides of the stator core 100 in the axial direction, and winding a conductor 132 around the teeth 112 of the stator core 100 and the connecting portion 250 of the first resin bobbin 200 and the connecting portion 350 of the second resin bobbin 300 (see Figure 8). Various known methods can be used to wind the conductor 132 around the teeth 112 and the connecting portion 250 and the connecting portion 350. For example, a method can be used in which a needle supplying the conductor 132 is swirled around the teeth 112 and the connecting portion 250 and the connecting portion 350. The conductor 132 is composed of a conductor such as copper or aluminum, and an insulating coating that covers the outer circumference of the conductor.

[0022] When winding the conductors 132 around the teeth 112, if the conductors 132 cross each other, the amount of conductors 132 that can be stored in the slot 115 decreases, and the space utilization rate decreases. Here, the winding condition of the first row around the teeth 112 greatly affects the crossing of the conductors 132. For example, if the first row is not wound in an aligned manner, there is a high probability that the conductors 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 to prevent the conductor wires 132 from crossing. 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 explained with reference to Figure 7. Figure 7(a) is a cross-sectional view of the first resin bobbin 200 along the radial direction, and Figure 7(b) is a cross-sectional view of Figure 7(a) from the direction of arrow bb. In Figure 7, the reference numerals for the components of the connecting portion 350 of the second resin bobbin 300 are indicated in parentheses.

[0023] The connecting portion 250 is formed as shown in Figure 7. Figure 7(a) is a cross-sectional view of the first resin bobbin 200 along the radial direction, and Figure 7(b) is a cross-sectional view of Figure 7(a) from the direction of arrow bb. The connecting portion 250 has a top surface 251 on the side opposite to the stator core 100, a first side surface 252 on one side in the circumferential direction, and a second side surface 253 on the other side in the circumferential direction. The top surface 251 extends along the radial and circumferential directions, while the first and second side surfaces extend along the axial and radial directions. The connection between the top surface 251 and the first side surface 252 is provided with a plurality of grooves 254 extending along the circumferential direction. In this embodiment, the grooves 264 are formed by projections 254a extending parallel (including "approximately parallel") along the circumferential direction. The connection between the top surface 251 and the second side surface 253 is provided with a plurality of grooves 255 extending along the circumferential direction. Similar to groove 254, the grooves 255 are formed by a plurality of projections 255a (not shown) extending parallel (including "approximately parallel") along the circumferential direction. By providing multiple grooves 254 and 255 at the connection points between the top surface 251 and the first side surface 252, and at the connection points between the top surface 251 and the second side surface 253, the first row of wires can be wound in an aligned manner. This prevents the wires from crossing in the second row and beyond, and allows the wires to be wound in an aligned manner. By winding the wires in an aligned manner without crossing, the space utilization rate of the wires within the slot 115 can be increased. Furthermore, if the tips of the projections 254a that form groove 254 and 255a that form groove 255 are sharp, there is a risk that the insulating coating of the conductors placed in grooves 254 and 255 may be damaged. For this reason, it is preferable to provide projections 254a and 255a with blunt tips. The phrase "projections with blunt tips" means "projections whose tips are not sharply pointed." Examples of blunt tips include projections whose tips have a curved shape including an arc shape (R-shape) or a planar shape. When integrally molding the first resin bobbin 200 having projections 254a and 255a with resin, blunt projections 254a and 255a are formed. Of course, methods for processing the tips of projections 254a and 255a, such as chamfering, can also be used.

[0024] Furthermore, a stepped surface 256 is formed between the top surface 251 of the connecting portion 250 and the inner circumferential surface 211 of the outer wall portion 210, so as to protrude on the side opposite to the stator core 100 (teeth 112). Furthermore, a stepped surface 257 is formed between the top surface 251 of the connecting portion 250 and the outer peripheral surface 222 of the inner wall portion 220, so as to protrude on the side opposite to the stator core 100 (teeth 112). By forming a stepped surface 256 at the connection point between the top surface 251 of the connecting portion 250 and the inner circumferential surface 211 of the outer wall portion 210, or by providing a stepped surface 257 at the connection point between the top surface 251 of the connecting portion 250 and the outer circumferential surface 222 of the inner wall portion 220, the first row of wires can be wound in an aligned manner. By winding the first row of wires in an aligned manner, it is possible to prevent the wires of the second row and beyond from crossing. By winding the wires in an aligned manner without crossing, the space utilization rate of the wires within the slot 115 can be increased. The height of the stepped surface 256 and the distance between the inner circumferential surface 211 of the outer wall portion 210 and the stepped surface 256, the height of the stepped surface 257 and the distance between the outer circumferential surface 222 of the inner wall portion 220 and the stepped surface 257 are appropriately set so that the conductors are neatly wrapped around it. Furthermore, one of the grooves 254, groove 255, stepped surface 256, and stepped surface 257 may be provided, or a combination of these may be provided as appropriate. The end face 250A of the connecting portion 250 on the stator core 100 side is used as the resin bobbin end face 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. The connecting portion 350 of the second resin bobbin 300 has the same shape as the connecting portion 250 of the first resin bobbin 200. Therefore, the connecting portion of the second resin bobbin 300 will be described with reference to Figure 7. In Figure 7, the reference numerals of each element of the connecting portion 350 of the second resin bobbin 300 are indicated in parentheses. 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 that extend parallel (including "approximately parallel") along the circumferential direction. Furthermore, a stepped surface 356 is formed between the top surface 351 of the connecting portion 350 and the inner circumferential surface 311 of the outer wall portion 310, and a stepped surface 357 is formed between the top surface 351 of the connecting portion 350 and the outer circumferential surface 322 of the inner wall portion 320. The stepped surfaces 356 and 357 are formed to protrude on the side opposite to the stator core 100 (stator core end face 100B).

[0026] Furthermore, in this embodiment, as shown in Figure 7, the portions of the outer and inner circumferential surfaces of the first resin bobbin 200 that are on the stator core 100 side are formed as inclined surfaces. Specifically, the portion 212m of the outer peripheral surface 212 of the outer wall portion 210 that is on the side of the stator core end face 100A is formed as an inclined surface that slopes radially inward, such that the distance between the outer peripheral surface 212 and the stator core end face 100A decreases as it 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, the portion 221m of the inner circumferential surface 221 of the inner wall portion 220 that is on the side of the stator core end face 100A is formed as an inclined surface that slopes radially outward, such that the distance between the inner circumferential surface 221 and the stator core end face 100A decreases as it 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 outer and inner circumferential surfaces of the second resin bobbin 300, on the stator core 100 side, are also formed as inclined surfaces, similar to the first resin bobbin 200. Specifically, the outer circumferential surface 312 of the outer wall portion 310, on the stator core end face 100B side, is formed as an inclined surface 312m that slopes radially inward toward the stator core end face 100B. Furthermore, the inner circumferential 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 the following: a surface extending in a straight line (tapered surface), a surface extending in a curved shape, a surface extending in a step-like manner, etc.

[0027] In this embodiment, no jumper wires are routed on the outside of 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 in the recess 200a of the first resin bobbin 200 and the stator cocoa 100 (stator core end face 100A). Furthermore, in this embodiment, jumper wires are routed on the outer circumferential surface of the outer wall portion 310 of the second resin bobbin 300. In this case, the inclined surface 312m formed on the outer circumferential surface 312 of the outer wall portion 310 can increase the insulation distance (creepage distance) between the jumper wires routed on the outer circumferential surface of the outer wall portion 310 and the stator core 100 (stator core end face 100B). In addition, the inclined surface 321m formed on the inner circumferential 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 face 100B). As described above, by forming the portions of the outer circumferential surface (outer circumferential surface of the outer wall) and the inner circumferential surface (inner circumferential surface of the inner wall) of the resin bobbin on the stator core side as inclined surfaces, the insulation properties can be improved without increasing the height of the resin bobbin. Furthermore, an inclined surface (an inclined surface on the outer wall and an inclined surface on the inner wall) may be provided on only one of the resin bobbins, the first resin bobbin 200 and the second resin bobbin 300. Alternatively, an inclined surface may be provided on only one of the outer circumferential surface of the outer wall and the inner circumferential surface of the inner wall.

[0028] The stator winding 130 is composed of multiple phase stator winding sections. In this embodiment, it is composed of first phase, second phase, and third phase (U phase, V phase, and W phase) stator winding sections. Each phase stator winding section has multiple winding sections connected in series or parallel. Each winding section, as shown in Figure 8, has a winding section 131 that is wound around teeth 112 (more specifically, teeth 112 and connecting section 250 and connecting section 350), and a pair of extension sections 132a and 132b that extend continuously from both ends of the winding section 131. Extension section 132a is the starting winding line, and extension section 132b is the ending winding line. The winding section 131 is composed of conductors 132 wound around the teeth 112 in rows (1st to nth rows) from the inside to the outside. When current is supplied to the stator winding 130, the potential difference between the first row of conductors 132 wound inside the teeth 112 and the nth row of conductors 132 wound outside the teeth 112 is large. In this case, if the first row of conductors 132 and the nth row of conductors 132 come into contact, insulation failure may occur. The first row of conductors 132 extends continuously from the winding start wire 132a. Therefore, it is necessary to prevent contact between the winding start wire 132a and the conductors 132 wound outside the teeth 112. The method for processing the winding start wire 132a will be explained with reference to Figure 8. Figure 8(a) is an enlarged view of the main part of the resin bobbin 200, and Figure 8(b) is a view of Figure 8(a) from the direction of arrow bb. Note that only the first row of wires 132 is shown in Figure 8(a), but in reality, multiple rows are wound around the bobbin as shown in Figure 8(b).

[0029] In this embodiment, the conductor 132 is wound around the teeth 112 by inserting a needle that supplies the conductor 132 into the slot 115 through the slot opening 115a. Furthermore, in this embodiment, the winding operation by the needle is started from a position on the radially outer side (outer wall 210 side) and ended at a position on the radially outer side (outer wall 210 side). That is, the starting line 132a and the ending line 132b are positioned on the outer wall 210 side of the first side surface 252 or the second side surface 253 of the connecting portion 250. Therefore, in this embodiment, the outer wall portion 210 of the first resin bobbin 200 has a plurality of grooves 213 formed in a location corresponding to the connection portion with the first side surface 252 or the second side surface 253 of the connecting portion 250 (near the connection portion). The grooves 213 are open on the side opposite to the stator core 100 along the axial direction, and 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 side in the circumferential direction, a side wall 213b on the other side in the circumferential direction, and a bottom wall 213c. Then, the winding start line 132a is pulled out from the inside to the outside of the outer wall portion 210 via the groove 213. In other words, the winding start line 132a is routed to the outside of the outer wall portion 210. The groove 213 is formed so that the starting wire 132a does not come into contact with, or come closer to than a predetermined distance from, the nth row of conductors 132 that are wound around the outside of the teeth 112. For example, the depth of the groove 213 is set so that the distance H (see Figure 8(b)) between the nth row of conductors 132 and the starting wire 132a does not fall below a set value. In this embodiment, by routing the winding start line 132a, which is continuous with the winding portion 131 that is wrapped around the teeth 112, to the outside of the outer wall portion 210, it is possible to prevent the winding start line 132a (the first row of conductors 132 that are wrapped around the inside of the teeth 112) and the nth row of conductors 132 that are wrapped around the outside of the teeth 112 from coming into contact with or being located near each other.

[0030] Here, at least one of the ends of the stator winding sections for the first to third phases is connected to the power supply. For example, in a star connection, one end is connected to the power supply and the other end is connected to the neutral point. In a delta connection, both ends are connected to the power supply. The end connected to the power supply is made up of a winding start wire 132a or winding end wire 132b that is continuous with the winding section 131 that constitutes the stator winding section, and is called the power supply side lead wire. The power supply lead wire needs to have increased insulation strength because it is connected to the power supply. In particular, when the power supply lead wire is formed by the winding start wire 132a, it is necessary to prevent it from coming into contact with the conductor 132 that is wound around the outside of the teeth 112, as mentioned above. When the power supply side lead wire is composed of a winding start wire 132a, the method for processing the winding start wire 132a will be explained with reference to Figure 3. The starting wire 132a that constitutes the power supply side lead wire is covered with an insulating tube. As the insulating tube, for example, an insulating tube made of a resin having insulating properties is used. The starting wire 132a, covered with an insulating tube, is drawn out from the inner circumferential surface 211 to the outer circumferential surface 212 of the outer wall portion 210 of the first resin bobbin 200 through one of the grooves 213 formed in the outer wall portion 210. Furthermore, it is drawn back from the outer circumferential surface 212 to the inner circumferential surface 211 of the outer wall portion 210 through the other groove 213. In Figure 3, it is wound around a projection formed between the two grooves 213. The retracted, insulating tube-covered starting end is then routed along one axial side of the winding portion 131 that is wrapped around the teeth 112. In other words, the insulating tube-covered starting end is positioned to overlap with the winding portion 131 when viewed from one axial side. Furthermore, if the power supply lead wire is made up of winding end wire 132b, it is routed along one side of the winding portion 131 in the axial direction while covered with an insulating tube. As will be described later, Figure 20 shows the state in which the power supply lead wire, covered with an insulating tube, is routed along one side in the axial direction of the winding section 131.

[0031] When the winding sections 131 are formed continuously, the conductor 132 is routed such that one of the pair of extensions (starting line 132a, ending line 132b) that are continuous with the winding section 131 is connected to one of the pair of extensions that are continuous with the other winding section 131. In other words, a connecting wire is provided to connect the two winding sections. In this embodiment, the jumper wires are routed on the second resin bobbin 300 side. As shown in Figure 4, the second resin bobbin 300 has a plurality of notches 316 formed in its outer wall portion 310, which allow the connecting wires 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. The notches 316 are open on the side opposite to the stator core 100, and also open to the outer circumferential surface 312 and the inner circumferential surface 311 of the outer wall portion 310. The notches 316 are formed by a first side wall 316a on one side in the circumferential direction, a second side wall 316b on the other side in the circumferential direction, and a bottom wall 316c on the side facing the stator core 100. In Figure 4, the outer wall portion 310 has three types of notches 316A to 316C formed therein to allow the connecting 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. Furthermore, guide grooves 315A to 315C are formed on the outer circumferential surface 312 of the outer wall portion 310 for routing the connecting wires that are pulled out to the outside of the outer wall portion 310 along the outer circumferential surface 312. The guide grooves 315A to 315C are formed at positions separated in the axial direction to prevent contact between the connecting wires into which they are inserted. The jumper wire is pulled out from the inside to the outside of the outer wall portion 310 through one of the notches 316A to 316C. It is then guided into one of the guide grooves 315A to 315C formed on the outer circumferential surface 312 of the outer wall portion 310 and routed along the outer circumferential surface 312. After that, it is pulled back from the outside to the inside of the outer wall portion 310 through one of the notches 316A to 316C. Furthermore, if the depths of the notches 316A to 316C are set to be equal, there is a risk that the strength of the outer wall portion 310 will decrease. Therefore, in this embodiment, the depths of the notches 316A to 316C are set to be different. This makes it possible to suppress the reduction in the strength of the outer wall portion 310 caused by forming the notches 316A to 316C. In other words, the tension of the connecting wires inserted into the notches 316A to 316C can be set to a higher level, and movement of the connecting wires can be prevented.

[0032] Here, conventionally, as shown by the dashed line in FIG. 10, 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 cross wire is drawn from the outside to the inside of the outer wall portion 310 through the notch 316. In this case, like the thin solid line indicated by the arrow A, when the cross wire passes through the notch 316, there is a risk of bulging greatly outside the outer wall portion 310. If the cross wire bulges greatly outside the outer wall portion 310, the cross wire may approach or contact other components, resulting in the risk of insulation failure. In the present embodiment, at least the shape of the outer peripheral surface 312 of the outer wall portion 310 at the location where the cross wire is drawn back from the outside to the inside of the outer wall portion 310 is changed as shown by the solid line in FIG. 10. 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 notch 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 prior art. Also, the outer peripheral surface 312 extends in an arc shape as in the prior art until near the notch 316. Then, the outer wall portion 310 is hollowed out (notched) 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 notch 316 from before the notch 316 along the circumferential direction (L2 < L1). In the present embodiment, it is hollowed out such that an inclined surface 312a extending linearly is formed on the outer peripheral surface 312 side. Of course, the shape of the inclined surface 312a is not limited to this. For example, in FIG. 10(b), the inclined surface 312a is formed in an arc shape protruding radially outward. In addition, in FIG. 10, when the cross wire is drawn around in the clockwise direction and passes through the notch 316, the outer peripheral surface 312 of the outer wall portion 310 is hollowed out like the inclined surface 312b. In this way, by removing material from the outer circumferential surface 312 of the outer wall portion 310 in the region near the notch 316 such that the radial thickness between the outer circumferential surface 312 and the inner circumferential surface 311 decreases toward the notch 316, the outward bulging of the connecting wire from the outer wall portion 310 can be suppressed, as shown by the thick arrow B in Figure 10.

[0033] Furthermore, the outer wall portion 210, inner wall portion 220, and connecting portion 250 of the first resin bobbin 200 and the outer wall portion 310, inner wall portion 320, and connecting portion 350 of the second resin bobbin 300 have the same configuration, except for the configuration that allows the winding start wire continuous with the winding portion to escape to the outside of the outer wall portion (groove 213 for passing the winding start wire) and the configuration that allows the connecting wire to be routed between different winding portions via the outer circumferential surface of the outer wall portion (guide grooves 315A to 315C for guiding the routing position of the connecting wire, and notches 316A to 316C for passing the connecting wire between the inside and outside of the outer wall portion). Of course, the first resin bobbin 200 and the second resin bobbin 300 may have the same configuration. Furthermore, since the second resin bobbin 300 is positioned so that its end face 350A faces the end face 100B of the stator core, the "one side in the axial direction" and the "other side in the axial direction" are reversed compared to the first resin bobbin 200.

[0034] Furthermore, in this embodiment, on the first resin bobbin 200 side, one end of each stator winding portion connected to the power supply (referred to as the "power supply 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 the neutral point (referred to as the "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 Figure 20, the power supply side lead wires (160U, 160V) and the neutral point lead wires (130Ub, 130Vb, 130Wb) are arranged in the order of power supply side lead wires (160U, 160V) and neutral point lead wires (130Ub, 130Vb, 130Wb) on the side opposite to the stator core 100 from the stator winding 130 (winding portion 131). At this time, the power supply lead wires and neutral point lead wires are secured to the first resin bobbin 200 with binding strings or the like to prevent them from moving. In this embodiment, as shown in Figure 14, a thin-walled portion 215 is formed on the outer wall portion 210 of the first resin bobbin 200. Furthermore, adjacent to the thin-walled portion 215, a communication hole 216 is formed that 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 radially inward from the outer peripheral surface 212 of the outer wall portion 210. This creates 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 to extend circumferentially at a position adjacent to the thin-walled portion 215 in the axial direction. This prevents the tie string 180 from protruding outward from the outer surface 212 of the outer wall portion 210 when securing the power supply lead wire and the neutral point lead wire using the tie string 180 passed through the communication hole 216.

[0035] Next, the phase-to-phase insulating member 170 will be described. In this embodiment, the interphase insulating member 170 shown in Figure 12 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, a resin film made of various known resins can be used. As shown in Figure 12, the interphase insulating member 170 is formed by folding a rectangular insulating film, which has edges 170a and 170b extending in the axial direction and edges 170c and 170d extending in a direction intersecting the axial direction, along folding lines 170A to 170C. The folding lines 170A to 170C divide it into a first end portion 171, a first central portion 172, a second central portion 173, and a second end portion 174. The interphase insulating member 170 shown in Figure 11 has a first central portion 172 and a second central portion 173 that are bent into a V-shape to form an interphase insulating portion. The first end portion 171 and the second end portion 174 are bent away from each other from both ends of the interphase insulating portion. In other words, the interphase insulating member 170 is bent so that its cross-section is V-shaped. In this embodiment, the interphase insulating member 170 corresponds to the "insulating member" of the present invention, and the first end 171 and the second end 174 correspond to the "pair of ends of the insulating member" or "pair of ends of the interphase insulating member" of the present invention.

[0036] The method for inserting the interphase insulating member 170 is described below. First, 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 positioned on the stator core end faces 100A and 100B on both sides in the axial direction of the stator core 100, will be explained with reference to Figures 5 and 6. As shown in Figure 5, the slot insulating member 120 has a main body portion (central portion 123, first intermediate portion 122, second intermediate portion 124) that extends from the inner circumferential surface 111a of the yoke to the side surface 113b of the second tooth base of the tooth 112 on one circumferential side and the side surface 113a of the first tooth base of the tooth 112 on the other circumferential side. The first end portion 121 and the second end portion 125 are bent from both ends of the main body portion so as to move closer to each other, and are positioned to face the outer circumferential surface 114c of the second tooth tip of the tooth 112 on one circumferential side and the outer circumferential surface 114b of the first tooth tip of the tooth 112 on the other circumferential side. In this state, the first resin bobbin 200 and the second resin bobbin 300 are positioned 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 positioned within recesses 240a and 240b of the inner wall portion 220 on one side in the circumferential direction of adjacent inner wall portions 220. That is, the fold line 120B between the first end portion 121 and the first intermediate portion 122 is positioned radially inward from the inner wall projection 243. Also, the first end portion 121 and the first intermediate portion 122 are positioned within recesses 330a and 330b of the inner wall portion 320 on one side in the circumferential direction of adjacent inner wall portions 320. That is, the fold line 120B between the first end portion 121 and the first intermediate portion 122 is positioned radially inward from the inner wall projection 333. The second end portion 125 and the second intermediate portion 124 are positioned within recesses 230a and 230b of the inner wall portion 220 on the other side in the circumferential direction of the adjacent inner wall portion 220. That is, the fold line 120C between the second end portion 125 and the second intermediate portion 124 is positioned radially inward from the inner wall projection 233. Also, the second end portion 125 and the second intermediate portion 124 are positioned within recesses 340a and 340b of the inner wall portion 320 on the other side in the circumferential direction of the adjacent inner wall portion 320. That is, the fold line 120C between the second end portion 125 and the second intermediate portion 124 is positioned radially inward from the inner wall projection 343. In this case, the radially outward movement of the first end 121 is restricted by the inner wall projection 243 of the inner wall portion 220 of the first resin bobbin 200 and the inner wall projection 333 of the inner wall portion 320 of the second resin bobbin 300. Furthermore, the radially outward movement of the second end 125 is restricted by the inner wall projection 233 of the inner wall portion 220 of the first resin bobbin 200 and the inner wall projection 343 of the inner wall portion 320 of the second resin bobbin 300. As a result, while a space is formed 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 side in the circumferential direction, 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 side in the circumferential direction, the radial outward movement of the first end 121 and the second end 125 (slot insulating member 120) is restricted. The axial movement of the slot insulating member 120 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, the axial movement of the first end portion 121 is restricted by the second movement restricting surface 241 of the inner wall portion 220 and the fourth movement restricting surface 341 of the inner wall portion 320, which are located on one side in the circumferential direction. Furthermore, the axial movement of the second end portion 125 is restricted by the first movement restricting surface 231 of the inner wall portion 220 and the third movement restricting surface 331 of the inner wall portion 320, which are located on the other side in the circumferential direction.

[0038] Next, the operation of inserting the interphase insulating member 170 into the slot 115 is shown in Figures 5, 9, and 13. Figure 14 See the explanation below. The first end 171 is positioned within the region defined by the outer circumferential surface 114c of the second tooth tip of the tooth 112 located on one side in the circumferential direction and the first end 121 of the slot insulating member 120. The second end 174 is positioned within the region defined by the outer circumferential surface 114b of the first tooth tip of the tooth 112 located on the other side in the circumferential direction and the second end 125 of the slot insulating member 120. The interphase insulating portion (first central portion 172 and second central portion 173) is positioned between the different phase winding portions 131 that are wound around each of the two circumferentially adjacent teeth 112.

[0039] In this embodiment, as shown in Figure 9, a first insertion guide groove 335 and a second insertion guide groove 345 are formed in the inner wall portion 320 of the second resin bobbin 300 to guide the insertion of the interphase insulating member 170 into the slot 115. The first insertion guide groove 335 is formed at one end of the third flange portion 330 in the circumferential direction. The first insertion guide groove 335 extends in the axial direction and is open on one side in the circumferential direction, one side in the axial direction, and the other side in the axial direction. That is, the first insertion guide groove 335 has an opening in the third movement restricting surface 331 (see Figure 6) that forms the recess 330a. Because the first insertion guide groove 335 communicates with the recess 330a, the first end portion 171 (or the second end portion 175) is positioned in the recess 330a via the first insertion guide groove 335. The second insertion guide groove 345 is formed at the other circumferential end of the fourth flange portion 340. The second insertion guide groove 345 extends in the axial direction and is open on the other circumferential side, one axial side, and the other axial side. That is, the second insertion guide groove 345 has an opening in the fourth movement restricting surface 341 (see Figure 6) that forms the recess 340a. Because the second insertion guide groove 345 communicates with the recess 340a, the second end portion 175 (or the first end portion 171) is positioned within the recess 340a via the second insertion guide groove 345.

[0040] When inserting the interphase insulating member 170 into the slot 115, it is folded so that the distance between the edges 170a and 170b is shortened, as shown in Figure 13. Then, in this state, it is inserted from the edge side on one side in the axial direction (for example, the edge 170c side). At this time, the first end 171 is inserted into the second insertion guide groove 345 formed in the inner wall portion 320 of the second resin bobbin 300 that is located on one side in the circumferential direction of the two adjacent inner wall portions 320. The second end 174 is inserted into the first insertion guide groove 335 formed in the inner wall portion 320 of the second resin bobbin 300 that is located on the other side in the circumferential direction of the two adjacent inner wall portions 320. The interphase insulating portions (first central portion 172, second central portion 173) are inserted between the two circumferentially adjacent inner wall portions 320 of the second resin bobbin 300, between the winding portions 131 of different phases that are wound around each of the circumferentially adjacent teeth 112.

[0041] The first end 171, which has passed through the second insertion guide groove 345, is positioned within the recess 340a. Within the recess 340a, the first end 171 is positioned 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. The second end 174, which has passed through the first insertion guide groove 335, is positioned within the recess 330a. Within the recess 330a, the second end 174 is positioned 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.

[0042] The operation of inserting the interphase insulating member 170 into the slot 115 along the axial direction is completed, for example, when the first end 171 or the second end 174 comes into contact with the inner wall portion 320 of the second resin bobbin 300, as shown in Figure 14. Specifically, the process is completed when the first end portion 171 (more precisely, the portion of the edge portion 170c corresponding to the first end portion 171) comes into contact with the second movement restricting surface 241 of the inner wall portion 220 located on one side in the circumferential direction of two adjacent inner wall portions 220, or when the second end portion 174 (more precisely, the portion of the edge portion 170c corresponding to the second end portion 174) comes into contact with the first movement restricting surface 231 of the inner wall portion 220 located on the other side in the circumferential direction.

[0043] Once the insertion of the interphase insulating member 170 into the slot 115 is complete, the external force that shortens the distance between the edges 170a and 170d is released. As a result, the interphase insulating member 170 returns to its original shape by elastic force. Specifically, the first end 171 of the interphase insulating member 170 is positioned within the recess 240a of the first resin bobbin 200 and within the recess 340a of the second resin bobbin 300. The second end 174 is positioned within the recess 230a of the first resin bobbin 200 and within the recess 330a of the second resin bobbin 300.

[0044] The radial movement of the interphase insulating member 170 is restricted as follows: The second end face 243a forming the recess 240a of the first resin bobbin 200 and the fourth end face 343a forming the recess 340a of the second resin bobbin 300 restrict the radial outward movement of the first end 171 of the interphase insulating member 170. Furthermore, the first end face 233a that forms the recess 230a of the first resin bobbin 200 and the recess of the second resin bobbin 300 330a forming Third end face 333a This restricts the radially outward movement of the second end 174 of the interphase insulating member 170. In other words, the first end face 233a, the second end face 243a, the third end face 333a, and the fourth end face 343a restrict the radially outward movement of the interphase insulating member 170. By preventing the radial movement of the interphase insulating member 170 (in this embodiment, radial outward movement), it is possible to prevent a decrease in insulating strength due to radial movement of the interphase insulating member.

[0045] The movement of the interphase insulating member 170 along the axial direction is restricted as follows: The second movement restricting surface 241, which forms the recess 240a of the first resin bobbin 200, restricts the movement of the first end 171 of the interphase insulating member 170 to one side in the axial direction. The first movement restricting surface 231, which forms the recess 230a of the first resin bobbin 200, restricts the movement of the second end 174 of the interphase insulating member 170 to one side in the axial direction. In other words, the first movement restricting surface 231 and the second movement restricting surface 241 restrict the movement of the interphase insulating member 170 to one side in the axial direction (towards the stator core end face 100A). Furthermore, the fourth movement restricting surface 341, which forms the recess 340a of the second resin bobbin 300, restricts the movement of the first end 171 of the interphase insulating member 170 toward the other side in the axial direction. The third movement restricting surface 331, which forms the recess 330a of the second resin bobbin 300, restricts the movement of the second end 174 of the interphase insulating member 170 toward the other side in the axial direction. In other words, the third movement restricting surface 331 and the fourth movement restricting surface 341 restrict the movement of the interphase insulating member 170 toward the other side in the axial direction (towards the stator core end face 100B). By preventing the interphase insulating member 170 from moving along the axial direction (in this embodiment, movement to one side in the axial direction and movement to the other side in the axial direction), it is possible to prevent a decrease in insulating strength due to the interphase insulating member moving along the axial direction.

[0046] Furthermore, in this embodiment, the first end 171 of the interphase insulating member 170 is positioned within the space defined by the outer peripheral surface 114c of the second tooth tip of the tooth 112 and the first end 121 of the slot insulating member 120, while the second end 174 is positioned within the space defined by the outer peripheral surface 114b of the first tooth tip of the tooth 112 and the second end 125 of the slot insulating member 120. As a result, even if the interphase insulating member 170 moves, for example, it is possible to prevent a gap from forming between the interphase insulating member 170 (first end 171, second end 174) and the slot insulating member 120 (first end 121, second end 125), thereby preventing insulation failure due to the movement of the interphase insulating member 170.

[0047] In Figure 5, the interphase insulating member 170 is inserted into the slot 115 such that the first end 171 is positioned on one side in the circumferential direction and the second end 174 is positioned on the other side in the circumferential direction. However, it is also possible to insert the member into the slot 115 such that the first end 171 is positioned on the other side in the circumferential direction and the second end 174 is positioned on one side in the circumferential direction. In this case, the end portion 171 and the central portion 172 become the second end portion and the second central portion, and the end portion 174 and the central portion 173 become the first end portion and the first central portion.

[0048] In this case, it may be desirable to increase the length of the interphase insulating member 170 along the axial direction to improve the insulating strength along the axial direction. For example, in order to increase the insulating distance along the axial direction, it may be required to use an interphase insulating member 170 that is longer than the distance between the first resin bobbin 200 and the second resin bobbin 300, which are located on both sides of the stator core 100 in the axial direction. When such an interphase insulating member 170 is inserted, for example, from the second resin bobbin 300 side, it comes into contact with the first movement restricting surface 231 or the second movement restricting surface 241 formed on the inner wall portion 220 of the first resin bobbin 200. At this time, as shown in Figure 19, the interphase insulating member 170 protrudes from the second resin bobbin 300 along the axial direction on the side opposite to the stator core 100. In this case, the insulation distance along the axial direction can be increased by the amount that the interphase insulating member 170 protrudes from the second resin bobbin 300 on the side opposite to the stator core 100 along the axial direction.

[0049] If the interphase insulating member 170 protrudes from the second resin bobbin 300 along the axial direction toward the side opposite to the stator core 100, the interphase insulating member 170 will not come into contact with the third movement restricting surface 331 or the fourth movement restricting surface 341 formed on the inner wall portion 320 of the second resin bobbin 300. As a result, there is a risk that the interphase insulating member 170 may move on the second resin bobbin 300 side. In this embodiment, the movement of the interphase insulating member 170 is restricted by attaching the cover 400 to the second resin bobbin 300.

[0050] The cover 400 has an outer peripheral wall 410, an inner peripheral wall 420, and a bottom wall 430, as shown in Figures 15, 16, and 17. The outer perimeter wall 410 has an outer perimeter surface and an inner perimeter surface, and extends along the circumferential and axial directions. The inner circumferential wall 420 is positioned radially inward of the outer circumferential wall 410, has an outer circumferential surface and an inner circumferential surface, and extends along the circumferential and axial directions. The bottom wall 430 is provided between the outer peripheral wall 410 and the inner peripheral wall 420, and extends along the circumferential and radial directions. The outer peripheral wall 410, the inner peripheral wall 420, and the bottom wall 430 form a recess 400a that extends along the circumferential direction. The cover 400 has at least one communication hole connecting the inside and outside. In this embodiment, a communication hole 431 is formed in the bottom wall 430. The communication hole 431 can suppress the temperature rise inside the cover 400. Furthermore, a mounting mechanism is provided for attaching the cover 400 to the second resin bobbin 300. In this embodiment, the mounting mechanism consists of an engaging piece and an engaging recess into which the engaging piece can engage. In this embodiment, as shown in Figure 17, an engaging 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 Figure 4, an engaging recess 360 is provided on the inner circumferential surface 311 of the outer wall portion 310 of the second resin bobbin 300.

[0051] Figure 18 shows the cover 400 attached to the second resin bobbin 300. As shown in Figure 18, the cover 400 is attached to the second resin bobbin 300 by the claws 441 of the engaging piece 440 provided on the cover 400 engaging with the engaging recess forming surface 361 that forms the engaging recess 360 of the second resin bobbin 300. At this time, the outer peripheral wall 410 of the cover 400 is positioned outside the outer wall portion 310 of the second resin bobbin 300. That is, the jumper 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 jumper wires from coming into contact with other parts and improves insulation properties. In addition, the tension of the jumper 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 exerted by the engagement of the engaging piece 440 into the engaging recess 360 acts to expand the diameter of the outer wall portion 310. Therefore, the tension of the jumper wires routed along the outer circumferential surface 312 of the outer wall portion 310 can be increased 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, when viewed from one side in the axial direction (opposite side from the stator core 100), a portion of the winding portion 131 is covered by the bottom wall 430 radially outward from the inner circumferential wall 420, while another portion of the winding portion 131 is exposed radially inward from the inner circumferential wall 420. This prevents interference of the jig when assembling the stator 10 to the compressor. It also enhances the cooling effect of the winding portion 131. The cover 400 is attached to the second resin bobbin 300, thereby restricting the axial movement of the interphase insulating member 170. In Figure 19, the cover 400 restricts the interphase insulating member 170 from moving to the other side of the axial direction (downward in Figure 19).

[0052] Of course, this embodiment can also use interphase insulating member 170 whose length along the axial direction is set so that it does not protrude from the first resin bobbin 200 or the second resin bobbin 300 on the opposite side from the stator core 100. In this case, for example, when the interphase insulating member 170 is inserted from the second resin bobbin 300 side until it contacts the first movement restricting surface 231 or the second movement restricting surface 241 formed on the inner wall portion 220 of the first resin bobbin 200, the interphase insulating member 170 elastically returns to its original position so that the distance between the first end 171 and the second end 174 increases. As a result, the interphase insulating member 170 is restricted from moving to one side in the axial direction by the first movement restricting surface 231 or the second movement restricting surface 241 of the first resin bobbin 200, and its movement to the other side in the axial direction is prevented by the third movement restricting surface 331 or the fourth movement restricting surface 341 formed on the inner wall portion 320 of the second resin bobbin 300. In this case, the cover 400 for restricting the movement of the interphase insulating member 170 can be omitted. On the other hand, even in such cases, attaching the cover 400 to the second resin bobbin 300 prevents the jumper wires routed to the outer peripheral surface 312 of the outer wall portion 310 of the second resin bobbin 300 from coming into contact with other components.

[0053] When the stator winding 130 is composed of first to third stator winding sections connected in a star configuration (for example, U-phase to W-phase stator winding sections), the neutral point connection ends of the first to third stator winding sections are connected in common and joined by welding or the like. In this case, the common connection point (neutral point) is covered by an insulating material and routed circumferentially within the recess 200a of the resin bobbin. However, even when covered with insulating material, there is a risk that other components, such as conductors, may be damaged due to contact between the common connection point and other conductors. In this embodiment, damage to other components caused by the common connection (neutral point), which is covered with an insulating material, is prevented by devising the arrangement of the common connection.

[0054] An example of the arrangement of the common connection section is shown in Figure 21. The stator windings for phases 1 to 3 have one end connected to the power supply (power supply side lead wire) and the other end connected to the neutral point (neutral point side lead wire). Figure 20 shows only the neutral point side lead wires 130Ub, 130Vb, and 130Wb for the stator windings of phases 1 to 3 (U phase to W phase). The power supply lead wires are covered with insulating material and routed circumferentially along one axial side of the stator winding 130 (specifically, the winding portion 131) within the recess 200a of the first resin bobbin 200. In Figure 20, only the insulating material 160U and 160V covering the U-phase and V-phase power supply lead wires are shown; the insulating material covering the W-phase power supply lead wire is hidden and therefore not shown. For example, insulating tubes with insulating properties can be used as the insulating material 160U and 160V. Furthermore, the neutral point lead wires 130Ub to 130Wb are connected in common and joined by heat welding or the like to form a common connection point (neutral point). The common connection point is covered with an insulating member 140. The insulating member 140 is formed from a resin film 150 having insulating properties, for example, as shown in Figure 20. First, an insulating resin film 150 is wound into a cylindrical shape. Then, the points indicated by arrows 151 and 152 are joined using an ultrasonic welding method or the like. This results in an insulating member 140, which is a cylindrical body having a joint 141 at one end and an opening 140a at the other end. Then, the common connection part is inserted into the insulating member 140 through the opening 140a. Furthermore, the common connection portion covered with the insulating member 140 is attached to at least one of the insulating members covering the power supply side lead wires. For example, with the insulating member 140 placed on top of the insulating member 160 (only insulating members 160U and 160V are shown in Figure 19) covering the U-phase to W-phase power supply side lead wires, the insulating member 140 and the insulating member 160 covering the U-phase to W-phase power supply side lead wires are tied together with the binding string 180. In this case, by utilizing the thin-walled portion 215 and communication hole 216 shown in Figure 14, as described above, it is possible to prevent the binding string 180 from protruding beyond the outer peripheral surface 212 of the outer wall portion 210.

[0055] Another example of the arrangement of the neutral point lead wire is shown in Figure 22. One end (power supply side lead wire) 130Ua to 130Wa is covered by insulating material 160U to 160W and is routed circumferentially within the recess 200a of the first resin bobbin 200. The other end (neutral point lead wires 130Ub to 130Wb) is joined in a common connection state to form a common connection section. Then, with the common connection section covered by the insulating member 140, it is positioned between the winding sections that are wrapped around each of the circumferentially adjacent teeth 112. Furthermore, if the interphase insulating member 170 is placed between the winding portions wrapped around each of the circumferentially adjacent teeth 112, the common connection portion can also be placed between the interphase insulating members 170. By configuring it as described above, the common connection point will not come into contact with the conductor or other components, thereby preventing damage to the conductor or other components.

[0056] Figure 23 shows an example of a modification to the inner wall of the first resin bobbin 200. The inner wall portion 220 of the second resin bobbin 300 shown in Figure 23 has a first flange portion 260 protruding to one side in the circumferential direction and a second flange portion 270 protruding to the other side in the circumferential direction. The first flange portion 260 faces the slot 115 and has a first axial movement restricting surface 261 (hidden in Figure 23) that extends in the circumferential and radial directions, as well as an outer peripheral surface 262 on one side in the circumferential direction. Furthermore, the first flange portion 260 has a first inner wall projection 263 that protrudes toward the stator core end face 100A side (the other side in the axial direction). The first inner wall projection 263 has a first radial movement restricting surface 263a (hidden in Figure 23) that extends in the circumferential and axial directions, radially inward of the first axial movement restricting surface 261. The first axial movement restricting surface 261, the first radial movement restricting surface 263a, and the first side surface 252 of the connecting portion 250 form a recess 260a (hidden in Figure 23) that is open on one side in the circumferential direction, the other side in the axial direction (towards the stator core end face 100A), and the radially outer side. The recess 260a constitutes a first movement restricting portion that restricts the movement of the interphase insulating member 170 to the other side in the axial direction and to the radially inward direction. The second flange portion 270 faces the slot 115 and has a second movement restricting surface 271 that extends in the circumferential and radial directions. Furthermore, the second flange portion 270 has a second inner wall projection 273 that protrudes toward the stator core end face 100A side (the other side in the axial direction). The second inner wall projection 273 has a second end face 273a that extends radially inward from the second movement restricting surface 271, along the circumferential and axial directions. The second movement restricting surface 271, the second end surface 273a, and the second side surface 253 of the connecting portion 250 form a recess 270a that is open on the other side in the circumferential direction and the other side in the axial direction. The recess 270a restricts the movement of the interphase insulating member 170 to one side in the axial direction and to the inside in the radial direction. In the first modified resin bobbin 200, the movement of the interphase insulating member 170 toward one side in the axial direction and toward the radially inward direction can be restricted. The second resin bobbin 300 can be configured similarly. In this case, the first insertion guide groove and the second insertion guide groove are configured to communicate with the recess.

[0057] In the first embodiment of the electric motor or compressor, the end processing was performed on the first resin bobbin 200 located on one side of the stator core in the axial direction, and the wiring of the jumper wires was performed on the second resin bobbin 300 located on the other side in the axial direction, but the invention is not limited to this. A second embodiment of the electric motor of the present invention is shown in Figures 24 and 25. The electric motor of the second embodiment consists of a stator core 500, a first resin bobbin 600 provided on one axial side of the stator core 500, a second resin bobbin 700 provided on the other axial side of the stator core 500, and a cover 800 attached to the first resin bobbin 600. In this embodiment, the end processing and jumper wire wiring processing are performed on the side of the first resin bobbin 600 provided on one axial side of the stator core 500. That is, in this embodiment, the configuration of the second resin bobbin 300 for processing jumper wire wiring processing in the first embodiment (weight-reducing cutouts, guide grooves) is provided on the first resin bobbin 600. The specific operation is the same as in the first embodiment, so the explanation will be omitted.

[0058] In the above description, the stator core, the first resin bobbin, and the second resin bobbin are formed as separate components. The first resin bobbin and the second resin bobbin are positioned on one side and the other side of the stator core in the axial direction. The method of arranging the first resin bobbin and the second resin bobbin on one axial side and the other axial side of the stator core is not limited thereto. For example, a method can be used in which a first resin bobbin and a second resin bobbin are integrally molded on one axial side and the other axial side of the stator core. As a method for integrally molding the first resin bobbin and the second resin bobbin onto the stator core, a known method, such as an insert molding method, can be used. When the first resin bobbin and the second resin bobbin are integrally molded with the stator core, the process of arranging the first resin bobbin and the second resin bobbin on both sides of the stator core in the axial direction is unnecessary. The description "a first resin bobbin and a second resin bobbin provided on one axial side and the other axial side of the stator core" includes "a first resin bobbin and a second resin bobbin separate from the stator core, provided on one axial side and the other axial side of the stator core" and "a first resin bobbin and a second resin bobbin integrally formed with the stator core on one axial side and the other axial side of the stator core."

[0059] The present invention is not limited to the configuration described in the embodiments, and various modifications, additions, and deletions are possible. The first and second resin bobbins are not limited to those described in the embodiment. For example, the material and shape of the first and second resin bobbins can be changed as appropriate. The inner wall protrusion 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. Also, the weight-reducing 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 a first insertion guide groove and a second insertion guide groove are formed in the second resin bobbin, the first and second insertion guide grooves can be omitted. The slot insulating member is not limited to the slot insulating member described in the embodiment. For example, the material and shape of the slot insulating member can be changed as appropriate. The interphase insulating member is not limited to the interphase insulating member described in the embodiment. For example, the material and shape of the interphase insulating member 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. Each of the components and parts described in the embodiments can be used individually, or multiple components can be used in combination as appropriate. The present invention can be configured as a stator, an electric motor equipped with a stator, and a compressor driven by the electric motor. [Explanation of Symbols]

[0060] 10, 20 stator 100, 500 stator cores 100a, 500a Stator core inner space 100A, 100B, 500A, 500B stator core end face 111 York 111a Inner surface of the yoke 112 Teeth 113 Teeth base 113a, 113b Side view of tooth base (side view of tooth) 114 Tooth tip 114A, 114B Teeth protrusion 114a Inner peripheral surface of tooth tip 114b, 114c Teeth tip outer circumferential surface 120 slot insulating material 120a~120d Edge 120A~120D Folded line 121, 122 End 122, 124 Middle section 125 Central part 130 Stator winding 130Ub, 130Ub, 130Wb: The other end (neutral point end) of the stator winding section. 131 Wrapping section 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 Folding line 171, 174 End 172, 173 central part 180 Binding rope 200, 300, 600, 700 resin bobbins 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 section 221, 321 Inner surface 222, 322 outer surface 230, 240, 260, 270, 330, 340 Guard portion 231, 241, 271, 331, 341 Movement restriction surfaces (axial movement restriction surfaces) 232, 242, 272, 273, 332, 342 outer surface 233, 243, 263, 273, 333, 343 Inner wall protrusion 233a, 243a, 273a, 333a, 343a End face (radial movement restriction surface) 233b, 243b, 333b, 343b side 230a, 240a, 270a, 330a, 340a recess 230b, 240b, 330b, 340b recess 250, 350 connection part 250A, 350A resin bobbin end face 251, 351 top surface 252, 253, 352, 353 Side view 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 Notches 316a, 316b side wall 316c bottom wall 335, 345 Insertion guide groove 360, 660 Engaging recess 361 Engaging recess forming surface (engaging surface) 400, 800 cover 400a recess 410 Peripheral wall 420 Inner wall 430 Bottom wall 431 Communication hole 440 locking pieces 441 Nails

Claims

1. Equipped with a rotor and a stator, The stator comprises a stator core, a plurality of resin bobbins, an insulating member, and a stator winding. The stator core comprises a yoke extending along the circumferential direction centered on the axis of the stator core, a plurality of teeth extending radially inward from the yoke, and a plurality of slots partitioned by the yoke and adjacent pairs of teeth. The plurality of resin bobbins include a first resin bobbin provided on one side in the axial direction of the stator core and a second resin bobbin provided on the other side in the axial direction. The first resin bobbin and the second resin bobbin each have an outer wall portion extending along the circumferential direction and facing the yoke, and a plurality of extending portions extending radially inward from the outer wall portion and facing the plurality of teeth, The stator winding has a plurality of winding portions that are wound around the teeth of the stator core and the extended portion of the first resin bobbin and the extended portion of the second resin bobbin. The insulating member has an interphase insulating portion disposed between the winding portion wound around the pair of teeth, and a first end and a second end formed by bending from both ends of the interphase insulating portion so as to be separated from each other. The extended portion of the first resin bobbin has, at the tip opposite to the outer wall portion, a first flange portion projecting to one side in the circumferential direction and a second flange portion projecting to the other side in the circumferential direction. The first flange portion has a first axial movement restricting surface that faces the slot and extends along the radial and circumferential directions, The second flange portion has a second axial movement restricting surface that faces the slot and extends along the radial and circumferential directions, The extended portion of the second resin bobbin has, at the tip opposite to the outer wall portion, a third flange portion projecting to one side in the circumferential direction and a fourth flange portion projecting to the other side in the circumferential direction. The third flange portion has a third axial movement restricting surface that faces the slot and extends along the radial and circumferential directions, The fourth flange portion has a fourth axial movement restricting surface that faces the slot and extends along the radial and circumferential directions, An electric motor configured such that the movement of the insulating member toward one side in the axial direction is restricted by the first axial movement restricting surface and the second axial movement restricting surface, and the movement of the insulating member toward the other side in the axial direction is restricted by the third axial movement restricting surface and the fourth axial movement restricting surface, The extended portion of the first resin bobbin has a side surface on one side in the circumferential direction and a side surface on the other side in the circumferential direction, The first flange portion has a first inner wall projection that protrudes to the other side in the axial direction, The first inner wall projection has a first radial movement restricting surface extending along the axial direction and the circumferential direction on one of the radially outer and radially inner sides of the first axial movement restricting surface, and a side surface extending along the axial direction and the radial direction on the other side of the circumferential direction. A first movement-restricting recess is formed by the side surface on one side in the circumferential direction of the extended portion of the first resin bobbin, the first axial movement restricting surface of the first flange portion, and the first radial movement restricting surface of the first inner wall projection portion. The side surface of the extended portion of the first resin bobbin on one side in the circumferential direction and the side surface of the first inner wall projection form a recess that is open on the other side in the axial direction, the radially inward side and the radially outward side. The second flange portion has a second inner wall projection that protrudes to the other side in the axial direction, The second inner wall projection has a second radial movement restricting surface extending along the axial direction and the circumferential direction on one of the radially outer and radially inner sides of the second axial movement restricting surface, and a side surface extending along the axial direction and the radial direction on one of the circumferential sides. A second movement-restricting recess is formed by the side surface of the extended portion of the first resin bobbin on the other side in the circumferential direction, the second axial movement restricting surface of the second flange portion, and the second radial movement restricting surface of the second inner wall projection portion. The side surface of the extended portion of the first resin bobbin on the other side in the circumferential direction and the side surface of the second inner wall projection form a recess that is open on the other side in the axial direction, the radially inward side and the radially outward side. The first end and the second end of the insulating member are positioned in adjacent second and first movement-restricting recesses, respectively. The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the movement of the insulating member along the radial direction. An electric motor characterized by the following features.

2. The electric motor according to claim 1, The first radial movement restricting surface is provided on the radially outer side of the first axial movement restricting surface, and a first movement restricting recess is formed by the side surface on one side in the circumferential direction of the extended portion of the first resin bobbin, the first axial movement restricting surface of the first flange portion, and the first radial movement restricting surface of the first inner wall protrusion, with the other side in the axial direction, the one side in the circumferential direction, and the radially inner side being open. The second radial movement restricting surface is provided on the radially outer side of the second axial movement restricting surface, and a second movement restricting recess is formed by the side surface on the other circumferential side of the extended portion of the first resin bobbin, the second axial movement restricting surface of the second flange portion, and the second radial movement restricting surface of the second inner wall protrusion, with the other axial side, the other circumferential side, and the radially inner side being open. The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the radial outward movement of the insulating member. An electric motor characterized by the following features.

3. The electric motor according to claim 1, The first radial movement restricting surface is provided on the radially inward side of the first axial movement restricting surface, and a first movement restricting recess is formed by the side surface on one circumferential side of the extended portion of the first resin bobbin, the first axial movement restricting surface of the first flange portion, and the first radial movement restricting surface of the first inner wall projection portion, with the other axial side, the one circumferential side, and the radially outward side being open. The second radial movement restricting surface is provided on the radially inward side of the second axial movement restricting surface, and a second movement restricting recess is formed by the side surface on the other circumferential side of the extended portion of the first resin bobbin, the second axial movement restricting surface of the second flange portion, and the second radial movement restricting surface of the second inner wall projection portion, with the other axial side, the other circumferential side, and the radially outward side being open. The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the movement of the insulating member radially inward. An electric motor characterized by the following features.

4. The electric motor according to claim 2, The extended portion of the second resin bobbin has a side surface on one side in the circumferential direction and a side surface on the other side in the circumferential direction, The third flange portion has a third inner wall projection that protrudes to one side in the axial direction, The third inner wall projection has a third radial movement restricting surface extending along the axial direction and the circumferential direction on the radially outer side of the third axial movement restricting surface, and a side surface extending along the axial direction and the radial direction on the other side in the circumferential direction. A third movement-restricting recess is formed by the side surface of the circumferential side of the extended portion of the second resin bobbin, the third axial movement restricting surface of the third flange portion, and the third radial movement restricting surface of the third inner wall projection portion, with the axial side, the circumferential side, and the radially inner side being open. The side surface of the extended portion of the second resin bobbin on one side in the circumferential direction and the side surface of the third inner wall projection form a recess that is open on one side in the axial direction, the radially inward side and the radially outward side. The fourth flange portion has a fourth inner wall projection that protrudes to one side in the axial direction, The fourth inner wall projection has a fourth radial movement restricting surface extending along the axial direction and the circumferential direction on the radially outer side of the fourth axial movement restricting surface, and a side surface extending along the axial direction and the radial direction on one side in the circumferential direction. A fourth movement-restricting recess is formed by the side surface of the extended portion of the second resin bobbin on the other side in the circumferential direction, the fourth axial movement restricting surface of the fourth flange portion, and the fourth radial movement restricting surface of the fourth inner wall projection portion, with the axial side, the other side in the circumferential direction, and the radially inner side being open. The side surface of the extended portion of the second resin bobbin on the other side in the circumferential direction and the side surface of the fourth inner wall projection form a recess that is open on one side in the axial direction, the radially inward side and the radially outward side. The first end and the second end of the insulating member are positioned in the adjacent fourth and third movement-restricting recesses, respectively. The first to fourth radial movement restricting surfaces are configured to restrict the radial outward movement of the insulating member. An electric motor characterized by the following features.

5. An electric motor according to any one of claims 1 to 4, The length of the insulating member along the axial direction is set to be longer than the length between the first resin bobbin and the second resin bobbin provided on both sides of the stator core in the axial direction. The stator further has a cover that is detachably attached to the second resin bobbin. The cover attached to the second resin bobbin is configured to restrict the movement of the insulating member toward the other side in the axial direction. An electric motor characterized by the following features.

6. An electric motor according to any one of claims 1 to 5, The third flange portion has a first insertion guide groove at one end in the circumferential direction that extends along the axial direction and opens to the third axial movement restricting surface. The fourth flange portion has a second insertion guide groove at the other end in the circumferential direction, which extends along the axial direction and opens to the fourth axial movement restricting surface. The insulating member is configured to be inserted into the slot guided by the first insertion guide groove and the second insertion guide groove. An electric motor characterized by the following features.

7. Equipped with a rotor and a stator, The stator comprises a stator core, a plurality of resin bobbins, an insulating member, and a stator winding. The stator core comprises a yoke extending along the circumferential direction centered on the axis of the stator core, a plurality of teeth extending radially inward from the yoke, and a plurality of slots partitioned by the yoke and adjacent pairs of teeth. The plurality of resin bobbins include a first resin bobbin provided on one side in the axial direction of the stator core and a second resin bobbin provided on the other side in the axial direction. The first resin bobbin and the second resin bobbin each have an outer wall portion extending along the circumferential direction and facing the yoke, and a plurality of extending portions extending radially inward from the outer wall portion and facing the plurality of teeth, The stator winding has a plurality of winding portions that are wound around the teeth of the stator core and the extended portion of the first resin bobbin and the extended portion of the second resin bobbin. The insulating member has an interphase insulating portion disposed between the winding portion wound around the pair of teeth, and a first end and a second end formed by bending from both ends of the interphase insulating portion so as to be separated from each other. The extended portion of the first resin bobbin has, at the tip opposite to the outer wall portion, a first flange portion projecting to one side in the circumferential direction and a second flange portion projecting to the other side in the circumferential direction. The extended portion of the second resin bobbin has, at the tip opposite to the outer wall portion, a third flange portion projecting to one side in the circumferential direction and a fourth flange portion projecting to the other side in the circumferential direction. An electric motor configured such that the movement of the insulating member toward one side in the axial direction and the movement toward the other side in the axial direction are restricted, The extended portion of the first resin bobbin has a side surface on one side in the circumferential direction and a side surface on the other side in the circumferential direction, The first flange portion has a first axial movement restricting surface that faces the slot and extends along the radial and circumferential directions, and also has a first inner wall projection that protrudes to the other side in the axial direction. The first inner wall projection has a first radial movement restricting surface extending along the axial direction and the circumferential direction on one of the radially outer and radially inner sides of the first axial movement restricting surface, and a side surface extending along the axial direction and the radial direction on the other side of the circumferential direction. A first movement-restricting recess is formed by the side surface on one side in the circumferential direction of the extended portion of the first resin bobbin, the first axial movement restricting surface of the first flange portion, and the first radial movement restricting surface of the first inner wall projection portion. The side surface of the extended portion of the first resin bobbin on one side in the circumferential direction and the side surface of the first inner wall projection form a recess that is open on the other side in the axial direction, the radially inward side and the radially outward side. The second flange portion has a second axial movement restricting surface that faces the slot and extends along the radial and circumferential directions, and also has a second inner wall projection that protrudes to the other side in the axial direction. The second inner wall projection has a second radial movement restricting surface extending along the axial direction and the circumferential direction on one of the radially outer and radially inner sides of the second axial movement restricting surface, and a side surface extending along the axial direction and the radial direction on one of the circumferential sides. A second movement-restricting recess is formed by the side surface of the extended portion of the first resin bobbin on the other side in the circumferential direction, the second axial movement restricting surface of the second flange portion, and the second radial movement restricting surface of the second inner wall projection portion. The side surface of the extended portion of the first resin bobbin on the other side in the circumferential direction and the side surface of the second inner wall projection form a recess that is open on the other side in the axial direction, the radially inward side and the radially outward side. The length of the insulating member along the axial direction is set to be longer than the length between the first resin bobbin and the second resin bobbin provided on both sides of the stator core in the axial direction. The stator further has a cover that is detachably attached to the second resin bobbin. The first end and the second end of the insulating member are positioned in adjacent second and first movement-restricting recesses, respectively. The first axial movement restricting surface and the second axial movement restricting surface of the first resin bobbin restrict the movement of the insulating member to one side in the axial direction, and the cover attached to the second resin bobbin restricts the movement of the insulating member to the other side in the axial direction. The first radial movement restricting surface and the second radial movement restricting surface are configured to restrict the movement of the insulating member along the radial direction. An electric motor characterized by the following features.

8. A compressor comprising a compression mechanism for compressing a cooling medium and an electric motor for driving the compression mechanism, A compressor characterized in that the electric motor used is the electric motor described in any one of claims 1 to 7.

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