Electrical insulator assembly, stator, electric motor and compressor

Abstract

To disclose an electrical insulator assembly that allows teeth to be easily inserted into tooth insertion holes and suppresses movement relative to the teeth.SOLUTION: An electrical insulator assembly 130 has a teeth insertion hole 130a. The inner wall forming the teeth insertion hole 130a includes an inner wall surface 131a formed on a first axial side, an inner wall surface 131b formed on a second axial side, an inner wall surface 131c formed on a first circumferential side, and an inner wall surface 131d formed on a second circumferential side. The inner wall surface 131c is formed with protrusions 132 and 133, and the inner wall surface 131d is formed with protrusions 134 and 135. The electrical insulator assembly 130 is prevented from moving relative to teeth 122 by the protrusions 132 and 133 abutting against an outer wall surface 122c of the teeth 122 and the protrusions 134 and 135 abutting against an outer wall surface 122d of the teeth 122.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to an electrical insulator assembly that is attached to teeth of a stator core, and more particularly, to an electrical insulator assembly that is attached to teeth of a stator core by inserting the teeth of the stator core into teeth insertion holes formed in the electrical insulator assembly. [Background technology]

[0002] Compressors that use an electric motor to drive a compression mechanism (called "electric compressors") are used as compressors installed in air conditioners (such as home air conditioners and vehicle air conditioners), refrigerators, etc. An electric compressor is disclosed in, for example, Patent Document 1 (JP 2007-285266 A). In addition, the electric motor that drives the compression mechanism is called a "concentrated winding motor" and includes a stator core having multiple teeth, multiple electrical insulator assemblies (sometimes called "resin bobbins" or "insulating members") attached to each tooth of the stator core, and a stator winding wound around each electrical insulator assembly. A concentrated winding motor is disclosed in, for example, Patent Document 2 (JP 2013-135585 A). In the electric motor disclosed in Patent Document 2, the electrical insulator assembly has teeth insertion holes into which the teeth of the stator core are inserted. The teeth are formed with first to fourth outer wall surfaces on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, respectively. The inner wall surfaces forming the teeth insertion holes have first to fourth inner wall surfaces that face the first to fourth outer wall surfaces of the teeth. The first to fourth inner wall surfaces of the electrical insulator assembly are configured to be in surface contact with the first to fourth outer wall surfaces of the teeth. This makes it possible to prevent the electrical insulator assembly from moving relative to the teeth during transportation, operation, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-285266 A [Patent Document 2] JP 2013-135585 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional electrical insulator assemblies, first to fourth inner wall surfaces that define the tooth insertion holes are configured to be in surface contact with first to fourth outer wall surfaces of the teeth. This makes it difficult to insert the teeth into the tooth insertion holes. Furthermore, the stator core is usually composed of multiple electromagnetic steel sheets stacked in the axial direction. In a conventional electrical insulator assembly, when inserting a tooth into a tooth insertion hole, a large load is applied to the electromagnetic steel sheets arranged on the first axial side and the second axial side of the tooth along the extending direction of the electromagnetic steel sheets. When a large load is applied to the electromagnetic steel sheets along the extending direction of the electromagnetic steel sheets, the electromagnetic steel sheets may be deformed (e.g., wavy or turned up). When the electromagnetic steel sheets arranged on both axial sides of the tooth are deformed, it becomes more difficult to insert the tooth into the tooth insertion hole. In order to facilitate the insertion of the teeth into the teeth insertion holes, a gap may be formed between the outer wall surface of the teeth and the inner wall surface of the teeth insertion holes, but this method may cause the electrical insulator assembly to move relative to the teeth. One object of the present application is to disclose an electrical insulator assembly that allows teeth to be easily inserted into teeth insertion holes and that can suppress movement relative to the teeth. Another object of the present application is to disclose a stator, an electric motor, and a compressor that use the electrical insulator assembly of the present disclosure. [Means for solving the problem]

[0005] The first disclosure relates to an electrical insulator assembly. The electrical insulator assembly of the present disclosure has teeth insertion holes into which the teeth of a stator core are inserted. The teeth extend in the radial direction and are provided with a first outer wall surface, a second outer wall surface, a third outer wall surface, and a fourth outer wall surface on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, respectively. The electrical insulator assembly of the present disclosure has an inner wall surface that defines a tooth insertion hole, and a plurality of protrusions that protrude from the inner wall surface into the tooth insertion hole. The inner wall surface of the tooth insertion hole has first to fourth inner wall surfaces which face the first to fourth outer wall surfaces of the teeth, respectively, when the teeth are inserted into the tooth insertion hole. That is, the inner wall surface of the tooth insertion hole has first to fourth inner wall surfaces formed on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, respectively. The plurality of protrusions include at least one of a first group of protrusions and a second group of protrusions. The first group of protrusions includes at least one first protrusion formed on the first inner wall surface and at least one second protrusion formed on the second inner wall surface. The second group of protrusions includes at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface. The electrical insulator assembly of the present disclosure is configured such that movement relative to the teeth is suppressed by the protrusions of at least one group coming into contact with the first to fourth outer wall surfaces of the teeth. In the electrical insulator assembly of the present disclosure, the outer wall surface of the tooth abuts against the protrusions formed on the inner wall surface that defines the tooth insertion hole, reducing the contact area compared to when the outer wall surface of the tooth abuts against the inner wall surface that defines the tooth insertion hole. The reduced contact area reduces the resistance when inserting the tooth into the tooth insertion hole. The force that holds the electrical insulator assembly on the tooth is set by adjusting the height of the protrusions (the length that protrudes from the inner wall surface). In the electrical insulator assembly of the present disclosure, the teeth can be easily inserted into the tooth insertion holes, and movement relative to the teeth can be suppressed. In a different aspect of the electrical insulator assembly of the first disclosure, the plurality of protrusions includes at least a first group of protrusions, i.e., the plurality of protrusions includes a first group of protrusions including at least one first protrusion and at least one second protrusion. In the electrical isolator assembly of this embodiment, movement of the teeth relative to the teeth is suppressed by abutment between a first outer wall surface formed on a first circumferential side and a second outer wall surface formed on a second circumferential side of the teeth and a first protrusion formed on a first inner wall surface formed on the first circumferential side and a second protrusion formed on a second inner wall surface formed on the second circumferential side of the electrical isolator assembly. In the electrical insulator assembly of this embodiment, the load applied to the third outer wall surface formed on the first axial side and the fourth outer wall surface formed on the second axial side of the teeth can be reduced. Typically, a stator core is made of multiple electromagnetic steel sheets stacked in the axial direction. In the electrical insulator assembly of this embodiment, the radial load applied to the third outer wall surface formed on the first axial side and the fourth outer wall surface formed on the second axial side of the teeth can be reduced. This makes it possible to prevent deformation of the electromagnetic steel sheets arranged on the first axial side and the second axial side of the teeth when the teeth are inserted into the teeth insertion holes. In the electrical insulator assembly of this embodiment as well, the teeth can be easily inserted into the teeth insertion holes, and movement relative to the teeth can be suppressed. The number, arrangement positions, etc. of the first protrusions and second protrusions included in the first group can be changed as appropriate. In a different embodiment of the electrical insulator assembly of the first disclosure, the first group of protrusions includes at least two first protrusions formed on the first inner wall surface and spaced apart in the axial direction, and at least one second protrusion formed on the second inner wall surface. Alternatively, the first group of protrusions includes at least one first protrusion formed on the first inner wall surface and at least two second protrusions formed on the second inner wall surface and spaced apart in the axial direction. In a different embodiment of the electrical insulator assembly of the first disclosure, the at least one second projection is formed between at least two of the first projections along the axial direction, or the at least one first projection is formed between at least two of the second projections along the axial direction. In a different embodiment of the electrical insulator assembly of the first disclosure, the at least one second projection is formed at a center of the second inner wall surface along the axial direction, and the at least two first projections are formed at equal distances from the at least one second projection along the axial direction. Alternatively, the at least one first projection is formed at a center of the first inner wall surface along the axial direction, and the at least two second projections are formed at equal distances from the at least one first projection along the axial direction. In a different configuration of the electrical insulator assembly of the first disclosure, the first group of protrusions includes at least two first protrusions formed on the first inner wall surface and at least two second protrusions formed on the second inner wall surface. In a different embodiment of the electrical insulator assembly of the first disclosure, the at least two first projections and the at least two second projections are formed at circumferentially opposing positions. In a variant of the electrical insulator assembly of the first disclosure, the at least two first projections are spaced apart from the center of the first inner wall surface in an axial direction by an equal distance, and the at least two second projections are spaced apart from the center of the second inner wall surface in an axial direction by an equal distance. In a different embodiment of the electrical insulator assembly of the first disclosure, the plurality of protrusions includes a first group of protrusions and a second group of protrusions, i.e., the plurality of protrusions includes a first group of protrusions including at least one first protrusion and at least one second protrusion, and a second group of protrusions including at least one third protrusion and at least one fourth protrusion. In the electrical isolator assembly of this embodiment, movement relative to the teeth is suppressed by abutment of the first and second outer wall surfaces of the teeth with the first and second protrusions, respectively, of the electrical isolator assembly, and by abutment of the third and fourth outer wall surfaces of the teeth with the third and fourth protrusions, respectively, of the electrical isolator assembly. In the electrical insulator assembly of this embodiment, the electrical insulator assembly can be more reliably prevented from moving relative to the teeth. In the electrical insulator assembly of this embodiment, the contact areas between the third outer wall surface formed on the first axial side and the fourth outer wall surface formed on the second axial side of the teeth and the third protrusion formed on the first axial side and the fourth protrusion formed on the second axial side of the electrical insulator assembly can be reduced compared to the conventional technology, making it easier to insert the teeth into the tooth insertion holes. In a different aspect of the electrical insulator assembly of the first disclosure, the plurality of protrusions includes at least a second group of protrusions, i.e., the plurality of protrusions includes a second group of protrusions including at least one third protrusion and at least one fourth protrusion. In the electrical insulator assembly of this embodiment, movement of the teeth relative to the teeth is suppressed by abutment between the third outer wall surface and the fourth outer wall surface formed on both axial sides of the teeth and the third and fourth protrusions formed on both axial sides of the electrical insulator assembly, respectively. In the electrical insulator assembly of this embodiment, the contact areas between the third and fourth outer wall surfaces of the teeth and the third and fourth protrusions of the electrical insulator assembly are smaller than the contact areas between the third and fourth outer wall surfaces of the teeth and the third and fourth inner wall surfaces of the electrical insulator assembly in the conventional technology, making it easier to insert the teeth into the teeth insertion holes. In the electrical insulator assembly of this embodiment, when the teeth are inserted into the teeth insertion holes, the radial load applied to the third and fourth outer wall surfaces of the teeth is reduced, thereby preventing deformation of the electromagnetic steel sheets arranged on the first and second axial sides of the teeth. The number, arrangement positions, etc. of the third protrusions and fourth protrusions included in the second group can be changed as appropriate. In a different embodiment of the electrical insulator assembly of the first disclosure, the at least one first projection and the at least one second projection extend radially or axially, and the at least one third projection and the at least one fourth projection extend radially or circumferentially. The term "extending in a radial direction" includes the aspect of "extending parallel to the radial direction (including "approximately parallel")" and the aspect of "extending in a direction oblique to the radial direction." The term "extending in an axial direction" includes the aspect of "extending parallel to the axial direction (including "approximately parallel")" and the aspect of "extending in a direction oblique to the axial direction." The term "extending in a circumferential direction" includes the aspect of "extending parallel to the circumferential direction (including "approximately parallel")" and the aspect of "extending in a direction oblique to the circumferential direction." The first to fourth protrusions are each composed of one protrusion portion that extends continuously or a plurality of protrusion portions that are spaced apart from one another. When at least one first protrusion and at least one second protrusion included in the first group extend radially parallel, at least one of the first protrusion and the second protrusion may fit between the stacked electromagnetic steel sheets when the tooth is inserted into the tooth insertion hole. When the first protrusion (second protrusion) fits between the stacked electromagnetic steel sheets, it is possible to prevent the electrical insulator assembly from moving in the axial direction relative to the tooth. In a different form of the electrical insulator assembly of the first disclosure, a recess recessed outside the tooth insertion hole is formed in at least one of a first boundary between the first inner wall surface and the third inner wall surface, a second boundary between the first inner wall surface and the fourth inner wall surface, a third boundary between the second inner wall surface and the third inner wall surface, and a fourth boundary between the second inner wall surface and the fourth inner wall surface. The electromagnetic steel sheets that make up the teeth are formed by punching an electromagnetic steel sheet base material. Here, burrs may be formed on the electromagnetic steel sheets that are formed by punching the electromagnetic steel sheet base material. If the burrs formed on the electromagnetic steel sheets that make up the teeth interfere with the first to fourth inner circumferential surfaces that form the teeth insertion holes, it becomes difficult to insert the teeth into the teeth insertion holes of the electrical insulator assembly. In the electrical insulator assembly of this embodiment, a recess is formed in at least one of the first to fourth boundaries to suppress interference between a burr formed on the tooth (more specifically, the electromagnetic steel plate constituting the tooth) and the first to fourth inner wall surfaces. The recess is formed, for example, so as to be able to accommodate a burr formed on the tooth. The location where the recess is formed is determined according to the position of the burr formed on the tooth. In the electrical insulator assembly of this embodiment, even if burrs are formed on the teeth, the teeth can be easily inserted into the teeth insertion holes. The second disclosure relates to the stator. The stator of the second disclosure is composed of a stator core, a plurality of electrical insulator assemblies, and a stator winding. The stator core is formed into a cylindrical shape by multiple electromagnetic steel plates laminated in the axial direction. The stator core can be composed of one core member or multiple core members. The stator core has a yoke extending in the circumferential direction and multiple teeth extending radially inward from the yoke along the radial direction. A plurality of electrical insulator assemblies are attached to each of the plurality of teeth. The stator windings are wound around an electrical insulator assembly that is attached to each of the plurality of teeth. As the electrical insulator assembly, the above-mentioned electrical insulator assembly is used. The stator of the present disclosure has similar advantages as the electrical insulator assembly previously described. The third disclosure relates to electric motors. The electric motor of the third disclosure includes a stator and a rotor. The stator is the stator described above. The electric motor of the third disclosure has the same effect as the electrical insulator assembly described above. The fourth disclosure relates to a compressor. The compressor of the fourth disclosure includes a compression mechanism that compresses a working medium and an electric motor that drives the compression mechanism. The electric motor is the electric motor described above. The compressor of the fourth disclosure has the same effect as the electrical insulator assembly described above. Effect of the Invention

[0006] In the electrical insulator assembly, stator, electric motor, and compressor of the present disclosure, the teeth can be easily inserted into the teeth insertion holes of the electrical insulator assembly, and the electrical insulator assembly can be prevented from moving relative to the teeth. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a cross-sectional view of a compressor according to an embodiment. [Diagram 2] FIG. 2 is a perspective view of a stator according to an embodiment. [Diagram 3] 3 is a view of FIG. 2 as seen in the direction of arrow III. [Figure 4] FIG. 2 is a diagram showing a stator core according to the first embodiment. [Diagram 5] FIG. 1 is a perspective view of an electrical insulator assembly according to a first embodiment. [Figure 6] 6 is a view of FIG. 5 as seen from the direction of arrow VI. [Figure 7] FIG. 6 is a view taken in the direction of arrow VII in FIG. 5. [Figure 8] 5A to 5C are diagrams illustrating an operation of attaching the electrical insulator assembly of the first embodiment to the teeth of the stator core of the first embodiment. [Figure 9] FIG. 6 is a diagram showing a stator core according to a second embodiment. [Figure 10] FIG. 11 is a diagram showing a stator core according to a third embodiment. [Figure 11] FIG. 11 is an assembly diagram of a stator core according to the third embodiment. [Figure 12] FIG. 13 is a perspective view of an electrical insulator assembly according to a second embodiment. [Figure 13] 13 is a view of FIG. 12 as seen in the direction of arrow XIII. [Figure 14] FIG. 13 is a perspective view of an electrical insulator assembly according to a third embodiment. [Figure 15] 15 is a view of FIG. 14 as seen in the direction of arrow XV. [Figure 16] FIG. 13 is a perspective view of an electrical insulator assembly according to a fourth embodiment. [Figure 17] 17 is a view of FIG. 16 as seen in the direction of arrow XVII. [Figure 18] FIG. 13 is a perspective view of an electrical insulator assembly of a fifth embodiment. [Figure 19] 19 is a view of FIG. 18 as seen in the direction of arrow XIX. [Figure 20] FIG. 13 is a perspective view of an electrical insulator assembly according to a sixth embodiment. [Figure 21] FIG. 21 is a view of FIG. 20 as seen in the direction of arrow XXI. [Figure 22] FIG. 13 is a perspective view of an electrical insulator assembly of a seventh embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In this specification, when the rotor is rotatably arranged on the stator, the extension direction (X direction) of the rotor center line P (see Fig. 1 and Fig. 2) of the rotor (rotor core) is referred to as the "axial direction." The rotor center line P of the rotor corresponds to the stator center line P of the stator (stator core). Moreover, the circumferential direction (Y direction) centered on the stator center line (rotor center line) P when viewed from one axial side is referred to as the "circumferential direction". Moreover, when viewed from one axial side, the extension direction (Z direction) of a line passing through the stator center line P is referred to as the "radial direction." The term "radially inner" refers to the side of the stator center line P along the radial direction (Z1 side), and the term "radially outer" refers to the side opposite the stator center line P along the radial direction (Z2 side). With respect to the electrical insulator assembly, the terms "axial", "circumferential" and "radial" refer to the "axial", "circumferential" and "radial" directions when disposed in a stator (stator core). In the following, the upper side of the paper in FIG. 1 (the upper side of the paper in FIG. 2) will be referred to as the "first axial side" (X1 side), and the lower side of the paper in FIG. 1 (the lower side of the paper in FIG. 2) will be referred to as the "second axial side" (X2 side). Also, when viewed from above in Figure 1 (viewed from above in Figure 2), the clockwise direction (Y1 direction) around the stator center line P is referred to as the "first circumferential side," and the counterclockwise direction (Y2 direction) is referred to as the "second circumferential side." Of course, the "first axial side", the "second axial side", the "first circumferential side" and the "second circumferential side" may be in the opposite directions.

[0009] A first embodiment of a compressor according to the present disclosure will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing a schematic configuration of a compressor 10 according to the first embodiment. The compressor 10 is composed of a sealed container 20 , a compression mechanism section 30 housed in the sealed container 20 , and an electric motor 100 . The sealed container 20 is formed by a cylindrical main body 20A, a lid 20B attached to one axial side and a bottom 20C attached to the other axial side of the main body 20A. The sealed container 20 is provided with a suction pipe 22 and a discharge pipe 23 . The compression mechanism 30 compresses a working medium (called a "refrigerant") that transfers thermal energy. As the working medium, for example, an HFC (hydrofluorocarbon) refrigerant is used. The compression mechanism 30 is composed of a cylinder 31, an eccentric rotor 32 rotated by a rotary shaft 40, and a compression chamber 33. The rotary shaft 40 is rotatably supported by bearings 24 and 25. When the eccentric rotor 32 rotates due to the rotation of the rotary shaft 40, the working medium sucked from the suction pipe 22 is compressed in the compression chamber 33. Then, the compressed working medium is discharged from the discharge pipe 23 via a discharge port 33a and a passage provided in the electric motor 100. In Fig. 1, the compression mechanism 30 and the electric motor 100 are disposed on the left and right sides along the vertical direction. That is, the compressor shown in Fig. 1 is configured as a vertical compressor. In FIG. 1, the electric motor 100 is disposed above the compression mechanism 30 (first axial side), but the electric motor 100 can also be disposed below the compression mechanism 30 (second axial side). The compression mechanism 30 and the electric motor 100 may also be disposed on the left and right sides along the horizontal direction. That is, the compressor 10 may be configured as a horizontally placed compressor. In this case, the positions of the compression mechanism 30 and the electric motor 100 along the horizontal direction may be changed as appropriate.

[0010] The electric motor 100 is composed of a stator 110 and a rotor 180 . The stator 110 is comprised of a stator core 120 , a number of electrical insulator assemblies 130 , and a stator winding 170 . The stator core 120 (described in detail later) is made up of a plurality of electromagnetic steel plates laminated in the axial direction. The stator core 120 is formed in a cylindrical shape, and has stator core end faces 120A and 120B on a first axial side and a second axial side. The stator core 120 also has a stator core inner peripheral surface (a teeth inner peripheral surface 122e, described later) and a stator core outer peripheral surface (a yoke outer peripheral surface 121d, described later). The stator core inner peripheral surface (the teeth inner peripheral surface 122e) forms a stator core inner space 120a. The stator core 120 has a yoke 121 extending in the circumferential direction, and a plurality of teeth 122 extending radially inward from the yoke 121 along the radial direction. A plurality of electrical insulator assemblies 130 (described in detail below) are attached to each of the teeth 122 of the stator core 120 so as to cover the teeth 122 . The stator windings 170 (more specifically, the conductors that make up the stator windings 170 ) are wound around the outer periphery of each of the multiple electrical insulator assemblies 130 . The rotor 180 is composed of a rotor core 190 and a rotating shaft 40 . The rotor core 190 is composed of a plurality of electromagnetic steel plates laminated in the axial direction. The rotor core 190 is formed in a cylindrical shape, and has rotor core end faces 190A and 190B on a first axial side and a second axial side. The rotor core 190 also has a rotor core inner peripheral surface 191 and a rotor core outer peripheral surface 192. The rotor core 190 is rotatably disposed in the stator core inner space 120a. The rotating shaft 40 is inserted into the rotor core inner space defined by the rotor core inner circumferential surface 191 by press fitting or the like.

[0011] The electric motor 100 corresponds to one embodiment of the electric motor of the present disclosure. The stator 110 corresponds to one embodiment of the stator of the present disclosure. The stator core 120 corresponds to the first embodiment of the stator core of the present disclosure. Electrical isolator assembly 130 corresponds to a first embodiment of the electrical isolator assembly of the present disclosure.

[0012] Next, the configuration of the stator 110 will be described with reference to FIGS. The stator 110 is composed of a stator core 120, a plurality of electrical insulator assemblies 130, and a stator winding 170. Note that in Fig. 2 and Fig. 3, in order to make it easier to see the assembled state of the stator core 120 and the electrical insulator assemblies 130, the stator winding 170 is omitted from illustration.

[0013] First, the configuration of the stator core 120 will be described with reference to Fig. 4. Fig. 4 is a plan view of the stator core 120. The stator core 120 includes a yoke 121 and a plurality of teeth 122 . The yoke 121 extends in the circumferential direction. The yoke 121 has yoke end faces 121a and 121b (not shown), a yoke inner peripheral surface 121c, and a yoke outer peripheral surface 121d. The yoke inner peripheral surface 121c extends along the sides of a regular polygon corresponding to the number of teeth 122. In this embodiment, it extends along the sides of a regular dodecagon (number of teeth=12). In this embodiment, the yoke inner peripheral surface 121c has a yoke inner peripheral surface portion 121c1 formed on a first circumferential side and a yoke inner peripheral surface portion 121c2 formed on a second circumferential side. The yoke outer peripheral surface 121d extends along a circle centered on the stator center line P. The teeth 122 are arranged at equal intervals in the circumferential direction, and each extends radially inward from the yoke 121 along the radial direction. The teeth 122 have a teeth end face 122a formed on a first axial side, a teeth end face 122b (not shown) formed on a second axial side, a teeth side face 122c formed on the first circumferential side, a teeth side face 122d formed on the second circumferential side, and a teeth inner circumferential face 122e formed on the radial inner side. The teeth end faces 122a and 122b extend in the radial and circumferential directions. The teeth side faces 122c and 122d extend in the radial and axial directions. The teeth inner circumferential face 122e extends along a circular arc centered on the stator center line P. The teeth inner circumferential face 122e forms a stator core inner space 120a. The radial extension direction of the teeth 122 indicates the extension direction of the center line of the teeth 122. Therefore, the radial extension direction of the teeth 122 differs for each tooth 122. For example, as shown in Fig. 4, the radial extension direction of the tooth 122(1) is different from the radial extension direction of the tooth 122(2). The same applies to the radial extension direction of the electrical insulator assembly 130 attached to the teeth 122. Yoke end face 121a and teeth end face 122a form stator core end face 120A on a first axial side, and yoke end face 121b and teeth end face 122b form stator core end face 120B on a second axial side. A slot is formed by two circumferentially adjacent teeth. In stator core 120 of this embodiment, tooth side surface 122c, tooth side surface 122d, tooth end surface 122a, and tooth end surface 122b of teeth 122 correspond to the "first outer wall surface," "second outer wall surface," "third outer wall surface," and "fourth outer wall surface" of the present disclosure, respectively.

[0014] Next, the configuration of the electrical insulator assembly 130 will be described with reference to FIGS. Fig. 5 is a perspective view of the electrical insulator assembly 130. Fig. 6 is a view of Fig. 5 as seen in the direction of arrow VI, and Fig. 7 is a view of Fig. 5 as seen in the direction of arrow VII. The electrical insulator assembly 130 is formed from a resin having insulating properties, such as polybutylene terephthalate (PBT) resin, polyphenylene sulfide (PPS) resin, liquid crystal polymer (LCP) resin, syndiotactic polystyrene (SPS) resin (registered trademark), nylon resin, or the like. The electrical insulator assembly 130 may also be referred to as a "plastic bobbin," an "electrical insulator," a "coil bobbin," or the like.

[0015] The electrical insulator assembly 130 includes a first collar portion 140 , a second collar portion 150 , and a body portion 160 . The first flange portion 140 extends in the axial and circumferential directions. The first flange portion 140 has an end face 141 on the radially inner side, and an end face 142 on the radially outer side. In addition, the first flange portion 140 has an outer wall surface 143a on a first axial side, an outer wall surface 143b on a second axial side, an outer wall surface 143c on a first circumferential side, and an outer wall surface 143d on a second circumferential side.

[0016] The second flange portion 150 is disposed radially inward from the first flange portion 140, and extends in the axial and circumferential directions. The second flange portion 150 has an end face 151 on the radially inner side, and an end face 152 on the radially outer side. In addition, the second flange portion 150 has an outer wall surface 153a on a first axial side, an outer wall surface 153b on a second axial side, an outer wall surface 153c on a first circumferential side, and an outer wall surface 153d on a second circumferential side.

[0017] The body portion 160 is provided between the first flange portion 140 and the second flange portion 150, and extends in the radial direction. The body portion 160 has a through hole 130a extending in the radial direction. The through hole 130a opens to an end face 142 of the first flange portion 140 and an end face 151 of the second flange portion 150. The inner wall surface forming the through hole 130a has inner wall surfaces 131a to 131d. The inner wall surfaces 131a to 131d are formed on a first axial side, a second axial side, a first circumferential side, and a second circumferential side, respectively. The inner wall surfaces 131a and 131b extend in the radial direction and the circumferential direction. The inner wall surfaces 131c and 131d extend in the radial direction and the axial direction. The inner wall surfaces 131a to 131d face the teeth end faces 122a, 122b and teeth side faces 122c, 122d of the teeth 122, respectively, when the teeth 122 are inserted into the through hole 130a. A protrusion is formed on the inner wall surface so as to protrude inwardly into the through hole 130a. In this embodiment, two protrusions 132 and 133 are formed on the inner wall surface 131c and spaced apart from each other in the axial direction. Also, two protrusions 134 and 135 are formed on the inner wall surface 131d and spaced apart from each other in the axial direction. Each of the protrusions 132 to 135 has a rectangular cross section and is constituted by one protruding portion extending parallel (including "approximately parallel") to the radial direction. The protrusion 132 (133) has an outer wall surface 132a (133a) formed on the second circumferential side, an outer wall surface 132b (133b) formed on the first axial side, and an outer wall surface 132c (133c) formed on the second axial side. The protrusion 134 (135) has an outer wall surface 134a (135a) formed on a first circumferential side, an outer wall surface 134b (135b) formed on a first axial side, and an outer wall surface 134c (135c) formed on a second axial side.

[0018] When tooth 122 is inserted into through hole 130a, tooth side surface 122c abuts against outer wall surface 132a of protrusion 132 and outer wall surface 133a of protrusion 133, and tooth side surface 122d abuts against outer wall surface 134a of protrusion 134 and outer wall surface 135a of protrusion 135, thereby suppressing movement of electrical insulator assembly 130 relative to tooth 122. In this embodiment, the protrusions 132 and 133 are formed at equal distances from the axial center of the inner wall surface 131c. The protrusions 134 and 135 are formed at equal distances from the axial center of the inner wall surface 131d. Furthermore, the protrusions 134 and 135 and the protrusions 132 and 133 are formed at positions facing each other in the circumferential direction. This allows the electrical insulator assembly 130 to be stably held on the teeth 122. The distance of the protrusions 132 and 133 (134 and 135) from the axial center of the inner wall surface 131c (131d) can be set appropriately. In addition, if the protrusions 132-135 included in the first group of protrusions extend radially parallel (including "approximately parallel"), when the teeth 122 are inserted into the through holes 130a, any of the protrusions 132-135 may become fitted between the stacked electromagnetic steel plates that make up the stator core 120. When any of the protrusions 132-135 becomes fitted between the stacked electromagnetic steel plates, the electrical insulator assembly 130 is prevented from moving axially relative to the teeth 122. In the above, two protrusions spaced apart in the axial direction are formed on the inner wall surface 131c (131d), but one or three or more protrusions may be formed.

[0019] The yoke 121 and teeth 122 of the stator core 120 are usually made of a plurality of electromagnetic steel sheets formed by punching an electromagnetic steel sheet base material. Here, when forming the electromagnetic steel sheets that make up the teeth 122 by punching the electromagnetic steel sheet base material, burrs may be generated on the electromagnetic steel sheets. If burrs are formed on the teeth 122 (more specifically, the electromagnetic steel sheets that form the teeth 122), there is a risk that the burrs on the teeth will interfere with the inner wall surfaces 131a-131d that form the through hole 130a when the teeth 122 are inserted into the through hole 130a of the electrical insulator assembly 130. If the burrs on the teeth interfere with the inner wall surfaces 131a-131d, it will be difficult to insert the teeth 122 into the through hole 130a. In the electrical insulator assembly of the present disclosure, recesses are formed in the teeth 122 at locations opposite to locations where burrs may be generated. In the electrical insulator assembly 130 of this embodiment, recesses 170a to 170d are formed recessed on the outside of the through hole 130a. The recess 170a is formed at the boundary between the inner wall surfaces 131a and 131c and is constituted by a groove extending in the radial direction. The recess 170b is formed at the boundary between the inner wall surfaces 131a and 131d and is constituted by a groove extending in the radial direction. The recess 170c is formed at the boundary between the inner wall surfaces 131b and 131c and is constituted by a groove extending in the radial direction. The recess 170d is formed at the boundary between the inner wall surfaces 131b and 131d and is constituted by a groove extending in the radial direction. The recesses 170a-170d are configured to suppress interference between burrs generated on the teeth 122 and the inner wall surfaces 131a-131d when the teeth 122 are inserted into the through holes 130a. For example, the recesses 170a-170d are formed to be able to accommodate burrs generated on the teeth 122. In the electrical insulator assembly 130 of the present embodiment, the recesses 170a to 170d are formed, so that even if burrs are formed on the teeth 122, the teeth 122 can be easily inserted into the through holes 130a. 5, a recess is formed at each of the four boundaries, but the recess may be formed at a boundary facing a portion of the tooth 122 where burrs may be generated. In other words, the recess may be formed at at least one boundary. Moreover, the shapes of the recesses 170a to 170d are set according to the shapes of burrs generated on the teeth 122, etc.

[0020] The body portion 160 has an outer wall surface 162a formed on a first axial side, an outer wall surface 162b formed on a second axial side, an outer wall surface 162c formed on a first circumferential side, and an outer wall surface 162d formed on a second circumferential side. The first flange 140 and the second flange 150 are formed so as to protrude from the outer wall surfaces 162a to 162d of the body 160. As a result, a space is formed between the first flange 140 and the outer wall surfaces 162a to 162d of the body 160 and between the first flange 140 and the second flange 150 and between the outer wall surfaces 162a to 162d of the body 160, around which the stator winding 170 (more specifically, the conductive wire that constitutes the stator winding 170) is wound. Various methods can be used to wind the stator winding 170 around the electrical insulator assembly 130. For example, a method can be used in which the electrical insulator assembly 130 is attached to the teeth 122 with the stator winding 170 wound around the electrical insulator assembly 130. Alternatively, a method can be used in which the electrical insulator assembly 130 is attached to the teeth 122 with the stator winding 170 wound around the electrical insulator assembly 130.

[0021] In the electrical insulator assembly 130 of the present embodiment, the through holes 130a correspond to the "tooth insertion holes" of the present disclosure. Moreover, inner wall surfaces 131c, 131d, 131a, and 131b of through hole 130a correspond to the "first inner wall surface," "second inner wall surface," "third inner wall surface," and "fourth inner wall surface" of the present disclosure, respectively. Furthermore, protrusions 132 and 133 correspond to "at least one first protrusion formed on the first inner wall surface" or "at least two first protrusions formed on the first inner wall surface" in the present disclosure, and protrusions 134 and 135 correspond to "at least one second protrusion formed on the second inner wall surface" or "at least two second protrusions formed on the second inner wall surface" in the present disclosure. The protrusions 132, 133 and the protrusions 134, 135 constitute a "first group of protrusions" of the present disclosure. In addition, the boundary between inner wall surfaces 131a and 131c corresponds to the "first boundary" of the present disclosure, the boundary between inner wall surfaces 131a and 131d corresponds to the "second boundary" of the present disclosure, the boundary between inner wall surfaces 131b and 131c corresponds to the "third boundary" of the present disclosure, and the boundary between inner wall surfaces 131b and 131d corresponds to the "fourth boundary" of the present disclosure. Moreover, the recesses 170a to 170d correspond to the "first recess", the "second recess", the "third recess" and the "fourth recess" of the present disclosure, respectively.

[0022] Next, the operation of attaching the electrical insulator assembly 130 to the teeth 122 will be described with reference to FIG. When attaching the electrical insulator assembly 130 to the teeth 122, the teeth 122 are inserted into the through holes 130a of the electrical insulator assembly 130. In this embodiment, the teeth inner peripheral surfaces 122e of the teeth 122 are inserted into the through holes 130a from the first flange portion 140 side. At this time, the teeth 122 are inserted into the through holes 130a so that the teeth side surfaces 122c, 122d and the teeth end surfaces 122a, 122b of the teeth 122 face the inner wall surfaces 131c, 131d, 131a, 131b of the through holes 130a, respectively. An inclined surface may be formed on the inner wall surfaces 131a to 131d of the through hole 130a toward the end surface 142 of the first flange portion 140, so that the teeth 122 are guided into the through hole 130a. The teeth 122 are inserted into the through holes 130a so that the inner peripheral surfaces 122e of the teeth protrude from the end surface 151 of the second flange portion 150. When the first flange portion 140 and the second flange portion 150 have the same shape, the teeth 122 can be inserted into the through-holes 130a from the second flange portion 150 side.

[0023] In this embodiment, the electrical insulator assembly 130 is attached to the teeth 122 in a state where movement relative to the teeth 122 is inhibited by the tooth side surface 122c abutting against protrusions 132, 133 formed on the inner wall surface 131c, and the tooth side surface 122d abutting against protrusions 134, 135 formed on the inner wall surface 131d. That is, the circumferential width m (see Figures 6 and 7) between protrusions 132 and 134 (133 and 135) is set to be slightly smaller than the circumferential width M (see Figure 8) of tooth 122 (the circumferential width of tooth end faces 122a, 122b). The width m is set based on the ease of inserting the teeth 122 into the through holes 130a, the effect of suppressing movement of the electrical insulator assembly 130 relative to the teeth 122, and the like. In this embodiment, the abutment of tooth side surfaces 122c and 122d with protrusions 132, 133 and protrusions 134, 135, respectively, restricts circumferential movement relative to tooth 122, and suppresses axial and radial movement relative to tooth 122.

[0024] In this embodiment, the contact area between tooth side surface 122c and protrusions 132, 133 and the contact area between tooth side surface 122d and protrusions 134, 135 are smaller than the contact area between tooth side surface 122c and inner wall surface 131c and the contact area between tooth side surface 122d and inner wall surface 131d in the conventional technology. Therefore, the insertion resistance when inserting the teeth 122 into the through holes 130a is small. Furthermore, by adjusting the height of protrusions 132, 133 (the length they protrude from inner wall surface 131c) and the height of protrusions 134, 135 (the length they protrude from inner wall surface 131d), the force holding electrical insulator assembly 130 to teeth 122 can be increased.

[0025] Furthermore, in this embodiment, electrical insulator assembly 130 can be held on tooth 122 by abutment between tooth side surface 122c and protrusions 132, 133 and between tooth side surface 122d and protrusions 134, 135, so there is no need for abutment between tooth end surface 122a and inner wall surface 131a and between tooth end surface 122b and inner wall surface 131b as in the conventional technology. For example, the axial length n between inner wall surfaces 131a and 131b (see Figures 6 and 7) can be made approximately equal to or slightly larger than the axial length N of tooth 122 (the length between tooth end surfaces 122a and 122b) (see Figure 8). In this case, when teeth 122 are inserted into through holes 130a, the radial load applied to teeth end faces 122a and 122b is reduced. The teeth 122 are made of a plurality of electromagnetic steel plates laminated in the axial direction. In this embodiment, when the teeth 122 are inserted into the through holes 130a, excessive loads are prevented from being applied to the electromagnetic steel plates arranged on the first axial side and the second axial side of the teeth 122 along the extension direction of the electromagnetic steel plates. This makes it possible to suppress deformation of the electromagnetic steel plates arranged on the first axial side and the second axial side of the teeth 122. In addition, the inner wall surface 131a abuts against the outer wall surface 122a, thereby restricting the movement of the electrical insulator assembly 130 toward the second axial side, and the inner wall surface 131b abuts against the outer wall surface 122b, thereby restricting the movement of the electrical insulator assembly 130 toward the first axial side. In the electrical insulator assembly of the first embodiment, two protrusions are formed on each of the inner wall surface on the first circumferential side and the inner wall surface on the second circumferential side, but the number and arrangement positions of the protrusions formed on the inner wall surface on the first circumferential side and the inner wall surface on the second circumferential side are not limited to this.

[0026] In the above, the stator core is configured from one core member, but the stator core can also be configured from a plurality of core members. A stator core 220 of the second embodiment will be described with reference to FIG. The stator core 220 of this embodiment is made up of a plurality of core members 225. The core members 225 are made up of a plurality of electromagnetic steel plates laminated in the axial direction. Core member 225 has a yoke portion 221 extending in the circumferential direction, and teeth portions 222 extending radially inward from yoke portion 221 along the radial direction. Yoke portion 221 has yoke portion end faces 221a, 221b (not shown), yoke portion inner peripheral surface 221c, yoke portion outer peripheral surface 221d, and yoke portion side surfaces. Yoke portion inner peripheral surface 221c has yoke portion inner peripheral surface portion 221c1 formed on a first circumferential side and yoke portion inner peripheral surface portion 221c2 formed on a second circumferential side. The yoke portion side surfaces include yoke portion side surface 221e formed on the first circumferential side and yoke portion side surface 221f formed on the second circumferential side. Teeth portion 222 has teeth end faces 222a, 222b (not shown), teeth side surface 222c formed on a first circumferential side, teeth side surface 222d formed on a second circumferential side, and teeth inner surface 222e formed on the radially inward side. A plurality of core members 225 are arranged in the circumferential direction to form the stator core 220. At this time, of the core members 225 adjacent in the circumferential direction, the yoke portion side surface 221e of one core member 225 and the yoke portion side surface 221f of the other core member 225 are joined by welding or the like. The yoke portion inner peripheral surface 221c (221c1, 221c2) of each core member 225 extends along the sides of a regular polygon corresponding to the number of teeth. Teeth inner circumferential surfaces 222e of core members 225 extend along an arc centered on stator core center line P. Teeth inner circumferential surfaces 222e of each core member 225 form stator core inner space 220a. Yoke portion end face 221a (221b) and teeth portion end face 222a (222b) of each core member 225 form core end face 220A (220B) of stator core 220. Yoke portion 221 of each core member 225 constitutes a yoke of stator core 220. Teeth portion 222 of each core member 225 constitutes a plurality of teeth of stator core 220.

[0027] In the stator core 220 of this embodiment, the teeth portion 222 corresponds to the "teeth" of the present disclosure, and the teeth portion side surface 222c, the teeth portion side surface 222d, the teeth portion end surface 222a, and the teeth portion end surface 222b of the teeth portion 222 correspond to the "first outer wall surface," "second outer wall surface," "third outer wall surface," and "fourth outer wall surface" of the present disclosure, respectively.

[0028] A stator core 320 according to the third embodiment will be described with reference to FIGS. The stator core 320 of this embodiment is composed of a first core member 325A and a plurality of second core members 325B. The first core member 325A and the second core member 325B are composed of a plurality of electromagnetic steel plates laminated in the axial direction. The first core member 325A has a yoke portion 321 extending in the circumferential direction. Yoke portion 321 has yoke portion end faces 321a and 321b (not shown), yoke portion inner circumferential surface 321c, and yoke portion outer circumferential surface 321d. Yoke portion inner circumferential surface 321c has yoke portion inner circumferential surface portions 321c1 to 321c3. Yoke portion inner circumferential surface portions 321c1 and 321c3 extend along the sides of a regular polygon corresponding to the number of teeth. Yoke portion inner circumferential surface portion 321c2 forms recess 321e that is recessed radially outward from yoke portion inner circumferential surface 321c (yoke portion inner circumferential surface portions 321c1, 321c3). The second core member 325B has a base portion 322 extending in the radial direction, and a tip portion 323 formed radially inward of the base portion 322 and extending in the circumferential direction. The base 322 has base end faces 322a and 322b (not shown), a base side face 322c, a base side face 322d, and a base outer circumferential face 322e. The tip portion 323 has tip end faces 323a, 323b (not shown), a tip inner peripheral surface 323c, a tip outer peripheral surface 323d, and a tip side surface. The tip outer peripheral surface 323d has a tip outer peripheral surface portion 323d1 formed on a first circumferential side and a tip outer peripheral surface portion 323d2 formed on a second circumferential side. The tip side surface has a tip side surface 323e formed on the first circumferential side and a tip side surface 323f formed on the second circumferential side. The stator core 320 is formed by inserting the base outer peripheral surface 322e of the base 322 of each second core member 325B into each recess 321e of the first core member 325A by press fitting or the like. A tip inner circumferential surface 323c of the second core member 325B extends along an arc centered on the stator core center line P. A stator core inner space 320a is formed by the tip inner circumferential surface 323c of the second core member 325B. A core end surface 320A (320B) of the stator core 320 is formed by the yoke portion end surface 321a (321b) of the first core member 325A, and the base end surface 322a (322b) and tip end surface 323a (323b) of the second core member 325B. The yoke of the stator core 320 is formed by the yoke portion 321 of the first core member 325A. The multiple teeth of the stator core 320 are formed by the base portion 322 and the tip portion 323 of the second core member 325B.

[0029] In this embodiment, each tooth is formed by tooth base 322A extending in the radial direction and tooth tip 322B provided radially inside tooth base 322A and extending in the circumferential direction. Tooth base 322A is formed by base end faces 322a, 322b and base side faces 322c, 322d of second core member 325B. Tooth tip 322B is formed by tip end faces 323a, 323b, tip inner circumferential surface 323c and tip outer circumferential surface 323d (tip outer circumferential surface portions 323d1, 323d2) of second core member 325B. In the stator core 320 of the present embodiment, the base portion 322 (tooth base portion 322A) corresponds to "the tooth to be inserted into the tooth insertion hole" of the present disclosure. Furthermore, base side surface 322c, base side surface 322d, base end surface 322a, and base end surface 322b of base 322 correspond to the "first outer wall surface," "second outer wall surface," "third outer wall surface," and "fourth outer wall surface" of this disclosure, respectively.

[0030] Different embodiments of the electrical insulator assembly are described below. The electrical insulator assemblies of different embodiments described below differ only in the number, arrangement, and extension direction of the protrusions, and other configurations (first flange, second flange, body, through hole, inner wall surface) are the same as those of the electrical insulator assembly 130 of the first embodiment. Therefore, only the protrusions will be described below. In addition, in Figures 12 to 22, parts equivalent to the first flange, second flange, body, through hole, and inner wall surface of the electrical insulator assembly 130 of the first embodiment are given reference numerals that are the same except for the third digit.

[0031] A second embodiment of an electrical insulator assembly 230 will now be described with reference to FIGS. In this embodiment, two protrusions 232 and 233 are formed on the inner wall surface 231c (first inner wall surface), and two protrusions 234 and 235 are formed on the inner wall surface 231d (second inner wall surface). The protrusions 232 to 235 extend in a direction inclined relative to the radial direction. Each of the protrusions 232 to 235 is formed of one continuous protruding portion. In this embodiment, the protrusions 232 to 235 are inclined from the radially outer side (Z2 side) to the radially inner side (Z1 side) so that the distance from the inner wall surface 231a becomes shorter (so that the distance from the inner wall surface 231b becomes longer). Note that it is also possible to incline the protrusions 232 to 235 so that the distance from the inner wall surface 231a becomes longer from the radially outer side (Z2 side) to the radially inner side (Z1 side). The inclination angle can be set appropriately. In this embodiment, the protrusions 232, 233 and the protrusions 234, 235 constitute a "first group of protrusions" of the present disclosure. The electrical insulator assembly 230 of this embodiment has the same effect as the electrical insulator assembly 130 of the first embodiment. In this embodiment, the contact area between the outer wall surface of the tooth and the protrusion is larger than the contact area between the outer wall surface of the tooth and the protrusion in the electrical insulator assembly 130 of the first embodiment, so that movement of the tooth can be further suppressed. The contact area between the outer wall surface of the tooth and the protrusion is set so that the tooth can be easily inserted into the through hole 230a.

[0032] A third embodiment of an electrical insulator assembly 330 will now be described with reference to FIGS. In this embodiment, two protrusions 332 and 333 are formed on inner wall surface 331c (first inner wall surface), and one protrusion 334 is formed on inner wall surface 331d (second inner wall surface). The protrusions 332 to 334 extend parallel to the radial direction (including "approximately parallel"). The protrusions 332 to 334 are each formed of one continuous protrusion portion. The protrusion 334 is formed at the center of the inner wall surface 331d along the axial direction. The protrusions 332 and 333 are formed at equal distances from the protrusion 334 along the axial direction. In this embodiment, the protrusions 332, 333 and the protrusion 334 constitute a "first group of protrusions" of the present disclosure. The electrical insulator assembly 330 of this embodiment has the same effects as the electrical insulator assembly 130 of the first embodiment while using a smaller number of protrusions. The positions and extending directions of the protrusions 332 to 334 can be changed as appropriate. Alternatively, one protrusion may be formed on the inner wall surface 331c (first inner wall surface), and two protrusions may be formed on the inner wall surface 331d (second inner wall surface).

[0033] A fourth embodiment of an electrical insulator assembly 430 will now be described with reference to FIGS. In this embodiment, one protrusion 432 is formed on inner wall surface 431c (first inner wall surface), and one protrusion 433 is formed on inner wall surface 431d (second inner wall surface). The protrusions 432, 433 extend parallel (including "approximately parallel") in the radial direction. The protrusions 432, 433 are formed of one continuous protrusion portion. In this embodiment, in order to stably hold the electrical insulator assembly 430 on the teeth, the widths of the protrusions 432 and 433 along the axial direction are set large (wide). The protrusions 432 and 433 are formed in the centers of the inner wall surfaces 431c and 431d, respectively, along the axial direction. The widths of the protrusions 432 and 433 can be set appropriately. In this embodiment, protrusion 432 and protrusion 433 constitute a "first group of protrusions" of the present disclosure. The electrical insulator assembly 430 of this embodiment has the same effect as the electrical insulator assembly 130 of the first embodiment while using a smaller number of protrusions. The positions and extending directions of the protrusions 432, 433 can be changed as appropriate.

[0034] A fifth embodiment of an electrical insulator assembly 530 will now be described with reference to FIGS. In this embodiment, one protrusion 532 is formed on inner wall surface 531c (first inner wall surface), and one protrusion 533 is formed on inner wall surface 531d (second inner wall surface). Protrusions 532, 533 extend parallel (including "approximately parallel") to the axial direction. Protrusions 532 and 533 are formed in the center of inner wall surfaces 531c and 531d, respectively, along the radial direction. Protrusions 532 and 533 are composed of one continuous protrusion portion. The widths of outer wall surface 532a formed on the second circumferential side of protrusion 532 and outer wall surface 533a formed on the first circumferential side of protrusion 533 can be set appropriately. In this embodiment, protrusion 532 and protrusion 533 constitute a "first group of protrusions" of the present disclosure. The electrical insulator assembly 530 of this embodiment has the same effects as the electrical insulator assembly 130 of the first embodiment while using a smaller number of protrusions. The arrangement positions and extending directions of the protrusions 532 and 533 can be changed as appropriate.

[0035] A sixth embodiment of an electrical insulator assembly 630 will now be described with reference to FIGS. In this embodiment, two protrusions 636 and 637 are formed on the inner wall surface 631a (third inner wall surface), and two protrusions 638 and 639 are formed on the inner wall surface 631b (fourth inner wall surface). The protrusions 636 to 639 extend parallel to the radial direction (including "approximately parallel"). The protrusions 636 to 639 are formed of one continuous protrusion portion. The protrusions 636 and 637 and the protrusions 638 and 639 are formed at positions facing each other in the axial direction. The protrusions 636 and 637 are formed at equal distances from the center of the inner wall surface 631a along the circumferential direction. The protrusions 638 and 639 are formed at equal distances from the center of the inner wall surface 631b along the circumferential direction. In this embodiment, the protrusions 636, 637 and the protrusions 638, 639 constitute a "second group of protrusions" of the present disclosure. In this embodiment, the electrical insulator assembly 630 is attached to the teeth in a state where movement relative to the teeth is inhibited by the teeth side surfaces formed on the first axial side abutting against protrusions 636, 637 and the teeth side surfaces formed on the second axial side abutting against protrusions 638, 639. That is, the length n (see FIG. 21) along the axial direction between the protrusions 636 and 638 (637 and 639) is set to be slightly smaller than the length N (see FIG. 8) along the axial direction of the teeth. The length n is set based on the ease of inserting the teeth into the through holes 630a, the effect of suppressing movement of the electrical insulator assembly 630 relative to the teeth, and the like. In this embodiment, the abutment between the end faces of the teeth formed on both axial sides and the protrusions 636 to 639 restricts axial movement of the teeth, and also suppresses circumferential and radial movement of the teeth.

[0036] In the electrical insulator assembly 630 of this embodiment, when the teeth are inserted into the through holes 630a, a load is applied in the radial direction to the end faces of the teeth on the first axial side and the second axial side. That is, a load is applied to the electromagnetic steel sheets arranged on the first axial side and the second axial side of the teeth in the extension direction of the electromagnetic steel sheets. However, in this embodiment, the contact areas between the end faces of the teeth on the first and second axial sides and the protrusions 636-639 are smaller than the contact areas between the end faces of the teeth on the first and second axial sides and the inner wall surfaces on the first and second axial sides in the prior art, so resistance is small when inserting the teeth into the through hole 630a. The force holding the electrical insulator assembly 630 to the teeth due to the abutment between the end faces of the teeth and the protrusions 636-639 can be increased by adjusting the height of the protrusions 636-639 (the length they protrude from the inner wall surfaces 631a, 631b) without making it difficult to insert the teeth into the through holes 630a. The number and arrangement of the protrusions formed on the inner wall surfaces 631a and 631b can be changed as appropriate For example, they can be formed as in the second to fifth embodiments.

[0037] A seventh embodiment of an electrical insulator assembly 730 will now be described with reference to FIG. In this embodiment, similarly to the electrical insulator assembly 130 of the first embodiment, two protrusions 732 and 733 are formed on an inner wall surface 731c (first inner wall surface), and two protrusions 734 and 735 are formed on an inner wall surface 731d (second inner wall surface). Also, similarly to the electrical insulator assembly 630 of the sixth embodiment, two protrusions 736 and 737 are formed on an inner wall surface 731a (third inner wall surface), and two protrusions 738 and 739 are formed on an inner wall surface 731b (fourth inner wall surface). In the electrical insulator assembly 730 of this embodiment, the protrusions 732, 733 and the protrusions 734, 735 constitute the "first group of protrusions" of the present disclosure, and the protrusions 736, 737 and the protrusions 738, 739 constitute the "second group of protrusions" of the present disclosure. In the electrical insulator assembly 730 of the present disclosure, movement relative to the teeth can be suppressed by abutment between the outer wall surface formed on the first circumferential side of the teeth and protrusions 732, 733, between the outer wall surface formed on the second circumferential side and protrusions 734, 735, between the outer wall surface formed on the first axial side of the teeth and protrusions 736, 737, and between the outer wall surface formed on the second axial side and protrusions 738, 739. The electrical insulator assembly of the seventh embodiment can also be modified in the same manner as the electrical insulator assemblies of the second to fifth embodiments and the electrical insulator assembly of the sixth embodiment.

[0038] The present disclosure can be configured as follows. (Aspect 1) An electrical insulator assembly having teeth insertion holes into which teeth are inserted, the teeth extending in a radial direction and having first to fourth outer wall surfaces formed on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, the teeth being configured to be inserted into the teeth insertion holes while being restricted from moving relative to the teeth, an inner wall surface that defines the tooth insertion hole; a plurality of protrusions protruding from the inner wall surface toward an inside of the tooth insertion hole, the inner wall surface has first to fourth inner wall surfaces that face the first to fourth outer wall surfaces of the teeth, respectively, when the teeth are inserted into the teeth insertion holes, the plurality of protrusions include at least one group of protrusions selected from a first group of protrusions including at least one first protrusion formed on the first inner wall surface and at least one second protrusion formed on the second inner wall surface, and a second group of protrusions including at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface; The electrical insulator assembly is configured such that movement of the teeth is suppressed by abutment between the first to fourth outer wall surfaces of the teeth and the protrusions of at least one of the groups. (Aspect 2) The electrical insulator assembly of aspect 1, 13. An electrical insulator assembly, comprising: the at least one first projection and the at least one second projection extending in a radial or axial direction; and the at least one third projection and the at least one fourth projection extending in a radial or circumferential direction. (Embodiment 3) The electrical insulator assembly of embodiment 1 or 2, an electrical insulator assembly, wherein the at least one first protrusion, the at least one second protrusion, the at least one third protrusion, and the at least one fourth protrusion are each formed as a single continuously formed protrusion portion. (Embodiment 4) The electrical insulator assembly of embodiment 1 or 2, 13. An electrical insulator assembly, comprising: the at least one first protrusion, the at least one second protrusion, the at least one third protrusion, and the at least one fourth protrusion, each of which is formed by a plurality of protrusion portions spaced apart from one another. (Aspect 5) An electrical insulator assembly according to any one of aspects 1 to 4, the plurality of protrusions comprises a first group of protrusions including at least one first protrusion formed on the first inner wall surface and at least one second protrusion formed on the second inner wall surface. (Aspect 6) An electrical insulator assembly according to any one of aspects 1 to 5, an electrical insulator assembly, characterized in that the first group of protrusions includes at least two first protrusions arranged on the first inner wall surface and spaced apart in the axial direction, and at least one second protrusion formed on the second inner wall surface, or the first group of protrusions includes at least one first protrusion formed on the first inner wall surface, and at least two second protrusions arranged on the second inner wall surface and spaced apart in the axial direction. (Aspect 7) The electrical insulator assembly of aspect 6, the at least one second projection is disposed between the at least two first projections along the axial direction, or the at least one first projection is disposed between the at least two second projections along the axial direction. (Embodiment 8) The electrical insulator assembly of embodiment 7, the at least one second projection is disposed at a center of the second inner wall surface along the axial direction, and the at least two first projections are disposed at equal distances from the at least one second projection along the axial direction; or the at least one first projection is disposed at a center of the first inner wall surface along the axial direction, and the at least two second projections are disposed at equal distances from the at least one first projection along the axial direction. (Embodiment 9) An electrical insulator assembly according to any one of embodiments 1 to 4, 1. An electrical insulator assembly, comprising: a first group of protrusions including at least two first protrusions formed on the first inner wall surface and at least two second protrusions formed on the second inner wall surface. (Aspect 10) The electrical insulator assembly of aspect 9, The at least two first projections and the at least two second projections are formed at opposing positions in the circumferential direction. (Aspect 11) The electrical insulator assembly of aspect 10, the at least two first projections are spaced apart from a center of the first inner wall surface along the axial direction at equal distances, and the at least two second projections are spaced apart from a center of the second inner wall surface along the axial direction at equal distances. (Aspect 12) The electrical insulator assembly of any one of aspects 5 to 11, the plurality of protrusions includes a second group of protrusions including at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface. (Aspect 13) An electrical insulator assembly according to any one of aspects 1 to 4, the plurality of protrusions includes a second group of protrusions including at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface. (Aspect 14) 14. The electrical insulator assembly of any of embodiments 1-13, comprising: an electrical insulator assembly characterized in that a recess recessed toward the outside of the tooth insertion hole is formed in at least one of a first boundary between the first inner wall surface and the third inner wall surface, a second boundary between the first inner wall surface and the fourth inner wall surface, a third boundary between the second inner wall surface and the third inner wall surface, and a fourth boundary between the second inner wall surface and the fourth inner wall surface. (Aspect 15) A stator winding is configured by a stator core, a plurality of electrical insulator assemblies, and a stator winding, The stator core is formed into a cylindrical shape by a plurality of electromagnetic steel plates laminated in an axial direction, and has a yoke extending in a circumferential direction and a plurality of teeth extending radially inward from the yoke along a radial direction, the plurality of electrical insulator assemblies are attached to the plurality of teeth, the stator winding is wound around the electrical insulator assembly attached to each of the plurality of teeth; A stator, characterized in that the electrical insulator assembly is any one of the electrical insulator assemblies according to embodiments 1 to 14. (Aspect 16) The stator of aspect 15, The stator according to claim 1, wherein the stator core is constituted by a plurality of core members. (Aspect 17) The stator of aspect 16, A stator characterized in that the stator core is composed of a plurality of core members each having a yoke portion extending in a circumferential direction and teeth portions extending radially inward from the yoke portion along a radial direction. (Aspect 18) The stator of aspect 16, A stator characterized in that the stator core is composed of a first core member having a yoke portion extending circumferentially, and a plurality of second core members having teeth portions extending radially. (Aspect 19) An electric motor including a stator and a rotor, 19. An electric motor, comprising the stator according to any one of aspects 15 to 18. (Aspect 20) A compressor including a compression mechanism for compressing a working medium and an electric motor for driving the compression mechanism, A compressor characterized in that the electric motor of aspect 19 is used as the electric motor.

[0039] The configurations of the electrical insulator assembly, stator core, stator, electric motor, and compressor of the present disclosure are not limited to the configurations described in the embodiments, and various modifications, additions, and deletions are possible. The shape of the electrical insulator assembly may vary. The protrusion may be constituted by one continuously extending protrusion portion or by a plurality of protrusion portions spaced apart from one another. The cross-sectional shape of the protrusion is not limited to a quadrangular shape (for example, a square shape or a rectangular shape), but can be set to various shapes such as a curved shape (including a circular shape). The contact area between the outer wall surface and the protrusion can be set appropriately. The extending direction of the protrusions can be set appropriately. For example, it can be set to a direction parallel to the radial direction (including "approximately parallel") or a direction inclined relative to the radial direction. It can also be set to a direction parallel to the axial direction (including "approximately parallel") or a direction inclined relative to the axial direction. It can also be set to a direction parallel to the circumferential direction (including "approximately parallel") or a direction inclined relative to the circumferential direction. The number of the first to fourth protrusions formed on each of the first to fourth inner wall surfaces of the electrical insulator assembly can be changed as appropriate. For example, a first group of protrusions including at least one (or at least two) first protrusions and second protrusions can be used. Alternatively, a first group of protrusions including at least one first protrusion (or second protrusion) and at least two second protrusions (or first protrusions) can be used. Alternatively, a second group of protrusions including at least one (or at least two) third protrusions and fourth protrusions can be used. Alternatively, a second group of protrusions including at least one third protrusion (or fourth protrusion) and at least two fourth protrusions (or third protrusions) can be used. Alternatively, a first group of protrusions and a second group of protrusions can be used. The positions (axial positions, radial positions, and circumferential positions) of the protrusions formed on the first to fourth inner wall surfaces of the electrical insulator assembly can be changed as appropriate. The shape, number, arrangement, etc. of the recesses formed at the boundaries between the first to fourth inner wall surfaces of the electrical insulator assembly are appropriately set so as to reduce resistance due to contact between burrs generated when forming the tooth insertion holes by punching and the first to fourth inner wall surfaces that form the tooth insertion holes. The shape of the stator core can be changed as appropriate. The stator core can be made up of one core member or multiple core members. When made up of multiple core members, the shape and number of the core members can be appropriately changed. As the electric motor, electric motors of various structures can be used. The compressor may be configured as various types of compressors, such as a horizontal compressor or a vertical compressor. As the compression mechanism that constitutes the compressor, compression mechanisms of various structures can be used. Each of the configurations described in the embodiments can be used alone or in combination with an appropriately selected plurality of configurations. [Explanation of symbols]

[0040] 10 Compressor 20. Airtight containers 20A Main Unit 20B Lid 20C bottom 21 Inner surface of sealed container 22 Suction pipe 23 Discharge pipe 24, 25 Bearings 30 Compression mechanism 31 Cylinder 32 Eccentric rotor 33 Compression chamber 33a Discharge port 40 Rotational Axis 100 Electric motor 110 Stator 120 Stator Core 120A, 120B Stator core end face 120a Stator core inner space 121 York 121a Yoke end face 121c Yoke inner surface 121c1, 121c2 Yoke inner surface part 121d Yoke outer surface 122, 122(1), 122(2) Teeth 122a, 122b Teeth end face 122c, 122d Teeth side 122e Inner surface of teeth 130, 230, 330, 430, 530, 630, 730 Electrical Insulator Assembly 130a, 230a, 330a, 430a, 530a, 630a, 730a through hole 131a~131d, 231a~231d, 331a~331d, 431a~431d, 531a~531d, 631a~631d, 731a~731d Inner wall surface 132~135, 232~235, 332~334, 432, 433, 532, 533, 632~635, 732~735, 736~739 protrusion 132a~132c, 133a~133c, 134a~134c, 135a~135c, 232a~232c, 233a~233c, 234a~234c, 235a~235c, 332a~332c, 333a~333c, 334a~334c, 432a ~432c, 433a~433c, 532a~532c, 533a~533c, 632a~632c, 633a~633c, 634a~634c, 635a~635c, 732a, 733a, 734a, 735a, 736a, 737a, 738a, 739a External wall surface 140, 150, 240, 250, 340, 350, 440, 450, 540, 550, 640, 650, 740, 750 flange 141,142,151,152,241,242,251,252,341,342,351,352,441,442,451,452,541,542,551,552,641,642,651,652,741,742,751,752 End face 143a~143d, 153a~153d, 243a~243d, 253a~253d, 343a~343d, 353a~353d, 443a~443d , 453a~453d, 543a~543d, 553a~553d, 643a~643d, 653a~653d, 743a~743d, 753a~753d External wall surface 160, 260, 360, 460, 560, 660, 760 Torso 162a~162d, 262a~262d, 362a~362d, 462a~462d, 562a~562d, 662a~662d, 762a~762d Exterior wall surface 170a~170d, 270a~270d, 370a~370d, 470a~470d, 570a~570d, 670a~670d, 770a~770d Concave 170 Stator Winding 180 Rotor 190 Rotor Core 190A, 190B Rotor core end face 191 Rotor core inner surface 192 Rotor core outer surface 220 Stator Core 220A Stator core end face 221 York 221a Yoke end face 221c Inner surface of yoke 221c1, 221c2 Inner surface of yoke 221d Outer periphery of yoke 221e, 221f Yoke side 222, 222(1), 222(2) Teeth 222a Teeth end face 222c, 222d Teeth side 222e Inner surface of teeth 225, 225(1), 225(2) Core member 320 Stator Core 320A Stator core end face 321 York 321a Yoke end face 321c Inner surface of yoke 321c1~321c3 Inner surface of yoke 321d Outer periphery of yoke 321e Recess 322A Teeth base 322B Teeth tip 322 Base 322a Base end face 322c, 322d base side 322e Base outer circumferential surface 323 Tip 323a Tip end face 323c Inner peripheral surface of tip 323d Tip outer circumferential surface 323d1, 323d2 Tip outer peripheral surface part 323e, 323f Tip side 325A First Core Component 325B, 325B(1), 325B(2) Second core member

Claims

1. An electrical insulator assembly having teeth insertion holes into which teeth are inserted, the teeth extending in a radial direction and having first to fourth outer wall surfaces formed on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, the teeth being configured to be inserted into the teeth insertion holes while being restricted from moving relative to the teeth, an inner wall surface that defines the tooth insertion hole; a plurality of protrusions protruding from the inner wall surface toward an inside of the tooth insertion hole, the inner wall surface has first to fourth inner wall surfaces that face the first to fourth outer wall surfaces of the teeth, respectively, when the teeth are inserted into the teeth insertion holes; the plurality of protrusions include at least one group of protrusions selected from a first group of protrusions including at least one first protrusion formed on the first inner wall surface and at least one second protrusion formed on the second inner wall surface, and a second group of protrusions including at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface; The electrical insulator assembly is characterized in that the electrical insulator assembly is configured such that movement of the teeth relative to the teeth is suppressed by abutment between the first to fourth outer wall surfaces of the teeth and the protrusions of at least one of the groups.

2. 2. The electrical insulator assembly of claim 1, the plurality of protrusions comprising a first group of protrusions including at least one first protrusion formed on the first inner wall surface and at least one second protrusion formed on the second inner wall surface.

3. 3. The electrical insulator assembly of claim 2, The electrical insulator assembly, characterized in that the first group of protrusions includes at least two first protrusions formed on the first inner wall surface and spaced apart in the axial direction, and at least one second protrusion formed on the second inner wall surface, or the first group of protrusions includes at least one first protrusion formed on the first inner wall surface and at least two second protrusions formed on the second inner wall surface and spaced apart in the axial direction.

4. 4. The electrical insulator assembly of claim 3, the at least one second projection is formed between the at least two first projections along the axial direction, or the at least one first projection is formed between the at least two second projections along the axial direction.

5. 5. The electrical insulator assembly of claim 4, the at least one second projection is formed at a center of the second inner wall surface along the axial direction, and the at least two first projections are formed at equal distances from the at least one second projection along the axial direction; or the at least one first projection is formed at a center of the first inner wall surface along the axial direction, and the at least two second projections are formed at equal distances from the at least one first projection along the axial direction.

6. 3. The electrical insulator assembly of claim 2, 11. An electrical insulator assembly, comprising: said first group of protrusions including at least two first protrusions formed on said first inner wall surface and at least two second protrusions formed on said second inner wall surface.

7. 7. The electrical insulator assembly of claim 6, The at least two first projections and the at least two second projections are formed at positions opposite to each other in the circumferential direction.

8. 8. The electrical insulator assembly of claim 7, the at least two first projections are formed along the axial direction at equal distances from a center of the first inner wall surface, and the at least two second projections are formed along the axial direction at equal distances from a center of the second inner wall surface.

9. 3. The electrical insulator assembly of claim 2, the plurality of protrusions includes a second group of protrusions including at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface.

10. 2. The electrical insulator assembly of claim 1, the plurality of protrusions includes a second group of protrusions including at least one third protrusion formed on the third inner wall surface and at least one fourth protrusion formed on the fourth inner wall surface.

11. 2. The electrical insulator assembly of claim 1, 13. An electrical insulator assembly, comprising: the at least one first projection and the at least one second projection extending radially or axially; and the at least one third projection and the at least one fourth projection extending radially or circumferentially.

12. 2. The electrical insulator assembly of claim 1, an electrical insulator assembly characterized in that a recess recessed toward the outside of the tooth insertion hole is formed in at least one of a first boundary between the first inner wall surface and the third inner wall surface, a second boundary between the first inner wall surface and the fourth inner wall surface, a third boundary between the second inner wall surface and the third inner wall surface, and a fourth boundary between the second inner wall surface and the fourth inner wall surface.

13. a stator core, a plurality of electrical insulator assemblies, and a stator winding; The stator core is formed into a cylindrical shape by a plurality of electromagnetic steel plates laminated in an axial direction, and has a yoke extending in a circumferential direction and a plurality of teeth extending radially inward from the yoke along a radial direction, the plurality of electrical insulator assemblies are attached to the plurality of teeth, the stator winding is wound around the electrical insulator assembly attached to each of the plurality of teeth; A stator, comprising an electrical insulator assembly according to any one of claims 1 to 12 as the electrical insulator assembly.

14. An electric motor including a stator and a rotor, An electric motor, comprising the stator according to claim 13 as the stator.

15. A compressor including a compression mechanism that compresses a working medium and an electric motor that drives the compression mechanism, A compressor using the electric motor according to claim 14 as the electric motor.

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