Electrical insulator assembly, stator, electric motor and compressor

Abstract

The invention provides an electrical insulator assembly, a stator, an electric motor, and a compressor. The electrical insulator assembly capable of easily inserting teeth into tooth insertion holes and suppressing movement relative to the teeth is disclosed. The electrical insulator assembly (130) has a tooth insertion hole (130a). The inner wall forming the tooth insertion hole (130a) includes an inner wall surface (131a) formed on a first side in the axial direction, an inner wall surface (131b) formed on a second side in the axial direction, an inner wall surface (131c) formed on a first side in the circumferential direction, and an inner wall surface (131d) formed on a second side in the circumferential direction. Protrusions (132, 133) are formed on the inner wall surface (131c), and protrusions (134, 135) are formed on the inner wall surface (131d). The protrusions (132, 133) abut against the outer wall surfaces (122c) of the teeth (122), and the protrusions (134, 135) abut against the outer wall surfaces (122d) of the teeth (122), thereby suppressing movement of the electrical insulator assembly (130) relative to the teeth (122).

Description

Technical Field

[0001] The present application relates to an electric insulator assembly mounted on a tooth of a stator core, and more particularly to an electric insulator assembly mounted on a tooth of a stator core by inserting the tooth of the stator core into a tooth insertion hole formed in the electric insulator assembly. Background Art

[0002] Compressors installed in air conditioners (household air conditioners, car air conditioners, etc.), refrigerators, etc. use compressors whose compression mechanisms are driven by electric motors (referred to as "electric compressors"). For example, Patent Document 1 (Japanese Patent Application Publication No. 2007-285266) discloses an electric compressor.

[0003] In addition, as an electric motor for driving the compression mechanism, an electric motor (called a "concentrated winding motor") is used, which includes a stator core, a plurality of electrical insulator assemblies (sometimes also called "resin winding bobbins" or "insulating components"), and a stator winding. The stator core has a plurality of teeth, the plurality of electrical insulator assemblies are mounted on each of the teeth of the stator core, and the stator winding is wound around each of the electrical insulator assemblies.

[0004] For example, Patent Document 2 (Japanese Patent Application Laid-Open No. 2013-135585) discloses a concentrated winding motor.

[0005] In the electric motor disclosed in Patent Document 2, the electric insulator assembly has a tooth insertion hole for inserting the teeth of the stator core. The first outer wall surface to the fourth outer wall surface of the tooth are formed on the first circumferential side, the second circumferential side, the first axial side, and the second axial side, respectively. In addition, the inner wall surface forming the tooth insertion hole has the first inner wall surface to the fourth inner wall surface opposite to the first outer wall surface to the fourth outer wall surface of the tooth. Furthermore, the first inner wall surface to the fourth inner wall surface of the electric insulator assembly are configured to be in surface contact with the first outer wall surface to the fourth outer wall surface of the tooth. As a result, the electric insulator assembly can be suppressed from moving relative to the teeth during transportation, operation, etc.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2007-285266

[0009] Patent Document 2: Japanese Patent Application Publication No. 2013-135585 Summary of the invention

[0010] Problem that the invention aims to solve

[0011] In the conventional electrical insulator assembly, the first to fourth inner wall surfaces forming the tooth insertion hole are configured to be in surface contact with the first to fourth outer wall surfaces of the tooth.

[0012] Therefore, it is difficult to perform the work of inserting the teeth into the teeth insertion holes.

[0013] In addition, the stator core is usually composed of a plurality of electromagnetic steel sheets stacked in the axial direction. In the conventional electrical insulator assembly, when inserting the teeth into the tooth insertion hole, a large load is applied to the electromagnetic steel sheets arranged on the first and second axial sides of the teeth along the extension direction of the electromagnetic steel sheets. If a large load is applied to the electromagnetic steel sheets along the extension direction of the electromagnetic steel sheets, the electromagnetic steel sheets may be deformed (for example, undulated or curled). If the electromagnetic steel sheets arranged on both sides of the teeth in the axial direction are deformed, it will be more difficult to insert the teeth into the tooth insertion hole.

[0014] In order to facilitate the work of inserting the tooth into the tooth insertion hole, a method of forming a gap between the outer wall surface of the tooth and the inner wall surface of the tooth insertion hole is considered. However, when using this method, the electrical insulator assembly may move relative to the tooth.

[0015] One object of the present application is to disclose an electric insulator assembly that can easily insert teeth into a teeth insertion hole and can suppress movement relative to the teeth. In addition, a different object of the present application is to disclose a stator, a motor, and a compressor using the electric insulator assembly of the present application.

[0016] Solutions for solving problems

[0017] The first technical solution relates to an electrical insulator assembly.

[0018] The electrical insulator assembly of the present technical solution has a tooth insertion hole for inserting the teeth of the stator core. The teeth extend in the radial direction, and furthermore, a first outer wall surface, a second outer wall surface, a third outer wall surface, and a fourth outer wall surface are formed on the first circumferential side, the second circumferential side, the first axial side, and the second axial side, respectively.

[0019] The electric insulator assembly of the present invention includes an inner wall surface forming a tooth insertion hole and a plurality of protrusions protruding from the inner wall surface toward the inside of the tooth insertion hole.

[0020] The inner wall surface of the tooth insertion hole has a first inner wall surface, a second inner wall surface, a third inner wall surface, and a fourth inner wall surface, which are respectively opposite to the first outer wall surface, the second outer wall surface, the third outer wall surface, and the fourth outer wall surface of the tooth when the tooth is inserted into the tooth insertion hole. That is, the inner wall surface of the tooth insertion hole has a first inner wall surface, a second inner wall surface, a third inner wall surface, and a fourth inner wall surface, which are respectively formed on the first side in the circumferential direction, the second side in the circumferential direction, the first side in the axial direction, and the second side in the axial direction.

[0021] 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.

[0022] Furthermore, the electrical insulator assembly of the present aspect is configured such that movement of the electrical insulator assembly relative to the tooth is suppressed by at least one set of protrusions abutting against the first to fourth outer wall surfaces of the tooth.

[0023] In the electrical insulator assembly of the present technical solution, since the outer wall surface of the tooth abuts against the protrusion formed on the inner wall surface forming the tooth insertion hole, the contact area is reduced compared to the case where the outer wall surface of the tooth abuts against the inner wall surface forming the tooth insertion hole. By reducing the contact area, the resistance when the tooth is inserted into the tooth insertion hole is reduced. In addition, the force that holds the electrical insulator assembly to the tooth is set by adjusting the height of the protrusion (the length protruding from the inner wall surface).

[0024] In the electric insulator assembly of the present aspect, the teeth can be easily inserted into the teeth insertion holes, and movement of the electric insulator assembly relative to the teeth can be suppressed.

[0025] In a different aspect of the electrical insulator assembly of the first aspect, the plurality of protrusions include at least a first group of protrusions, that is, the plurality of protrusions include a first group of protrusions including at least one first protrusion and at least one second protrusion.

[0026] In the electrical insulator assembly of the present technical solution, the first outer wall surface formed on the first circumferential side and the second outer wall surface formed on the second circumferential side of the tooth respectively abut against the first protrusion formed on the first inner wall surface formed on the first circumferential side and the second protrusion formed on the second inner wall surface formed on the second circumferential side of the electrical insulator assembly, thereby suppressing the movement of the electrical insulator assembly relative to the tooth.

[0027] In the electric insulator assembly of the present aspect, it is possible to reduce the load applied to the third outer wall surface formed on the first side in the axial direction and the fourth outer wall surface formed on the second side in the axial direction of the tooth.

[0028] Generally, the stator core is composed of a plurality of electromagnetic steel sheets stacked in the axial direction. In the electrical insulator assembly of the present technical solution, 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 tooth can be reduced. Thus, when the tooth is inserted into the tooth insertion hole, deformation of the electromagnetic steel sheets arranged on the first axial side and the second axial side of the tooth can be prevented.

[0029] In the electric insulator assembly of the present aspect, the teeth can be easily inserted into the teeth insertion holes, and movement of the electric insulator assembly relative to the teeth can be suppressed.

[0030] The number, arrangement positions, and the like of the first protrusions and the second protrusions included in the first group can be changed as appropriate.

[0031] In a different technical solution of the electrical insulator assembly of the first technical solution, the first group of protrusions includes at least two first protrusions formed axially separately on the first inner wall surface 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 axially separately on the second inner wall surface.

[0032] In a different embodiment of the electrical insulator assembly of the first embodiment, at least one second protrusion is formed between at least two first protrusions in the axial direction. Alternatively, at least one first protrusion is formed between at least two second protrusions in the axial direction.

[0033] In a different technical solution of the electrical insulator assembly of the first technical solution, at least one second protrusion is formed at the center of the second inner wall surface in the axial direction. Furthermore, at least two first protrusions are formed to be equidistant from at least one second protrusion in the axial direction. Alternatively, at least one first protrusion is formed at the center of the first inner wall surface in the axial direction. Furthermore, at least two second protrusions are formed to be equidistant from at least one first protrusion in the axial direction.

[0034] In a different aspect of the electrical insulator assembly of the first aspect, 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.

[0035] In a different aspect of the electric insulator assembly according to the first aspect, at least two first protrusions and at least two second protrusions are formed at positions facing each other in the circumferential direction.

[0036] In a different embodiment of the electrical insulator assembly of the first embodiment, at least two first protrusions are formed equidistant from the center of the first inner wall surface in the axial direction. Also, at least two second protrusions are formed equidistant from the center of the second inner wall surface in the axial direction.

[0037] In a different technical solution of the electrical insulator assembly of the first technical solution, the plurality of protrusions include a first group of protrusions and a second group of protrusions. That is, the plurality of protrusions include 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.

[0038] In the electrical insulator assembly of the present technical solution, the movement of the electrical insulator assembly relative to the tooth is suppressed by the first outer wall surface and the second outer wall surface of the tooth respectively abutting against the first protrusion and the second protrusion of the electrical insulator assembly, and the third outer wall surface and the fourth outer wall surface of the tooth respectively abutting against the third protrusion and the fourth protrusion of the electrical insulator assembly.

[0039] In the electric insulator assembly of the present aspect, it is possible to more reliably suppress the movement of the electric insulator assembly relative to the teeth.

[0040] In the electrical insulator assembly of the present embodiment, the contact areas of 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 tooth 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, respectively, can be reduced compared to the prior art. Therefore, the tooth can be easily inserted into the tooth insertion hole.

[0041] In a different aspect of the electrical insulator assembly of the first aspect, the plurality of protrusions include at least a second group of protrusions, that is, the plurality of protrusions include a second group of protrusions including at least one third protrusion and at least one fourth protrusion.

[0042] In the electrical insulator assembly of the present technical solution, the third and fourth outer wall surfaces formed on both axial sides of the tooth abut against the third and fourth protrusions formed on both axial sides of the electrical insulator assembly, respectively, thereby suppressing movement of the electrical insulator assembly relative to the tooth.

[0043] In the electric insulator assembly of the present embodiment, the contact areas of the third outer wall surface and the fourth outer wall surface of the tooth and the third protrusion and the fourth protrusion of the electric insulator assembly, respectively, are smaller than the contact areas of the third outer wall surface and the fourth outer wall surface of the tooth and the third inner wall surface and the fourth inner wall surface of the electric insulator assembly, respectively, in the prior art. Therefore, the tooth can be easily inserted into the tooth insertion hole.

[0044] In the electrical insulator assembly of the present technical solution, when the tooth is inserted into the tooth insertion hole, the radial load applied to the third outer wall surface and the fourth outer wall surface of the tooth is reduced. This can prevent deformation of the electromagnetic steel sheets arranged on the axial first side and the axial second side of the tooth.

[0045] The number, arrangement positions, and the like of the third protrusions and the fourth protrusions included in the second group can be changed as appropriate.

[0046] In a different aspect of the electrical insulator assembly of the first aspect, at least one first protrusion and at least one second protrusion extend in a radial direction or an axial direction, and at least one third protrusion and at least one fourth protrusion extend in a radial direction or a circumferential direction.

[0047] The description of “extending in the radial direction” includes the form of “extending in parallel with the radial direction (including “substantially parallel”)” and the form of “extending in a direction inclined relative to the radial direction”. The description of “extending in the axial direction” includes the form of “extending in parallel with the axial direction (including “substantially parallel”)” and the form of “extending in a direction inclined relative to the axial direction”. The description of “extending in the circumferential direction” includes the form of “extending in parallel with the circumferential direction (including “substantially parallel”)” and the form of “extending in a direction inclined relative to the circumferential direction”.

[0048] Each of the first to fourth protrusions is composed of a single protrusion portion extending continuously or a plurality of protrusion portions arranged separately.

[0049] When at least one first protrusion and at least one second protrusion included in the first group extend parallel to the radial direction, at least one of the first protrusion and the second protrusion may be embedded between the stacked electromagnetic steel sheets when the tooth is inserted into the tooth insertion hole. When the first protrusion (the second protrusion) is embedded between the stacked electromagnetic steel sheets, the electrical insulator assembly can be suppressed from moving in the axial direction relative to the tooth.

[0050] In different technical schemes of the electrical insulator assembly of the first technical scheme, a recessed portion recessed toward the outside of the tooth insertion hole is formed at at least one of the first boundary between the first inner wall surface and the third inner wall surface, the second boundary between the first inner wall surface and the fourth inner wall surface, the third boundary between the second inner wall surface and the third inner wall surface, and the fourth boundary between the second inner wall surface and the fourth inner wall surface.

[0051] The electromagnetic steel sheet constituting the teeth is formed by punching the electromagnetic steel sheet base material. Here, burrs are sometimes formed on the electromagnetic steel sheet formed by punching the electromagnetic steel sheet base material. If the burrs formed on the electromagnetic steel sheet constituting the teeth interfere with the first to fourth inner peripheral surfaces forming the tooth insertion hole, it is difficult to insert the teeth into the tooth insertion hole of the electrical insulator assembly.

[0052] In the electrical insulator assembly of the present technical solution, a recessed portion is formed at at least one of the first to fourth boundaries to suppress interference between a burr formed on a tooth (more specifically, an electromagnetic steel sheet constituting the tooth) and the first to fourth inner wall surfaces. The recessed portion is formed, for example, to accommodate the burr formed on the tooth. The location where the recessed portion is formed is determined according to the position of the burr formed on the tooth.

[0053] In the electrical insulator assembly of the present aspect, even when burrs are formed on the teeth, the teeth can be easily inserted into the teeth insertion holes.

[0054] The second technical solution relates to a stator.

[0055] The stator according to the second invention is composed of a stator core, a stator winding, and a plurality of electrical insulator assemblies.

[0056] The stator core is formed into a cylindrical shape by a plurality of electromagnetic steel sheets stacked in the axial direction. The stator core can be composed of one core member or a plurality of core members. The stator core has a yoke extending in the circumferential direction and a plurality of teeth extending radially inward from the yoke in the radial direction.

[0057] A plurality of electrical insulator assemblies are respectively mounted on the plurality of teeth.

[0058] The stator winding is wound around electrical insulator assemblies respectively mounted on the plurality of teeth.

[0059] And, the above-mentioned electric insulator component is used as the electric insulator component.

[0060] The stator of the present technical solution has the same effect as the above-mentioned electric insulator assembly.

[0061] The third technical solution relates to an electric motor.

[0062] The electric motor according to the third technical solution includes a stator and a rotor, and the above-mentioned stator is used as the stator.

[0063] The electric motor according to the third aspect has the same effects as the above-mentioned electric insulator assembly.

[0064] The fourth technical solution relates to a compressor.

[0065] The compressor according to the fourth aspect includes a compression mechanism for compressing a working medium and an electric motor for driving the compression mechanism, and the above-mentioned electric motor is used as the electric motor.

[0066] The compressor according to the fourth aspect has the same effects as the above-mentioned electrical insulator assembly.

[0067] Effects of the Invention

[0068] In the electric insulator assembly, the stator, the motor, and the compressor of the present application, the teeth can be easily inserted into the teeth insertion holes of the electric insulator assembly, and the electric insulator assembly can be prevented from moving relative to the teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 It is a cross-sectional view of a compressor according to one embodiment.

[0070] Figure 2 This is a perspective view of a stator according to one embodiment.

[0071] Figure 3 Observed from the direction of arrow III Figure 2 The obtained picture.

[0072] Figure 4 It is a diagram showing a stator core according to the first embodiment.

[0073] Figure 5 It is a perspective view of the electrical insulator assembly according to the first embodiment.

[0074] Figure 6 Observed from the direction of arrow VI Figure 5 The obtained picture.

[0075] Figure 7 Observed from the direction of arrow VII Figure 5 The obtained picture.

[0076] Figure 8 It is a diagram for explaining the operation of attaching the electric insulator assembly of the first embodiment to the teeth of the stator core of the first embodiment.

[0077] Fig. 9 It is a diagram showing a stator core according to a second embodiment.

[0078] Fig.10 It is a diagram showing a stator core according to a third embodiment.

[0079] Fig.11 It is an assembly diagram of the stator core according to the third embodiment.

[0080] Fig.12 It is a perspective view of the electrical insulator assembly according to the second embodiment.

[0081] Fig.13 Observed from the direction of arrow XIII Fig.12 The obtained picture.

[0082] Fig.14 It is a perspective view of an electric insulator assembly according to a third embodiment.

[0083] Fig.15 Observed from the direction of arrow XV Fig.14 The obtained picture.

[0084] Fig.16 It is a perspective view of an electric insulator assembly according to a fourth embodiment.

[0085] Fig.17 Observed from the direction of arrow XVII Fig.16 The obtained picture.

[0086] Fig.18 It is a perspective view of an electric insulator assembly according to a fifth embodiment.

[0087] Fig.19 Observed from the direction of arrow XIX Fig.18 The obtained picture.

[0088] Fig. 20 It is a perspective view of an electric insulator assembly according to a sixth embodiment.

[0089] Fig.21 Observed from the direction of arrow XXI Fig. 20 The obtained picture.

[0090] Fig. 22 It is a perspective view of an electrical insulator assembly according to a seventh embodiment.

[0091] Description of Reference Numerals

[0092] 10. compressor; 20. airtight container; 20A. main body; 20B. cover; 20C. bottom; 21. inner peripheral surface of airtight container; 22. suction pipe; 23. discharge pipe; 24, 25. bearing; 30. compression mechanism; 31. cylinder; 32. eccentric rotor; 33. compression chamber; 33a. discharge port; 40. rotating shaft; 100. motor; 110. stator; 120. stator core; 120A, 120B, stator core end surface; 120a, stator core inner space; 121. yoke; 121a, yoke end surface; 121c, yoke inner peripheral surface; 121c1, 121c2, yoke inner peripheral surface portion; 121d, yoke outer peripheral surface; 122, 122(1), 122(2), tooth; 122a, 122b, tooth end face; 122c, 122d, tooth side face; 122e, tooth inner peripheral surface; 130, 230, 330, 430, 530, 630, 730, electrical insulator component; 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, 332-3 34, 432, 433, 532, 533, 632~635, 732~735, 736~739, protrusion; 132a~132c, 133a~133c, 134a~134c, 135a~135c, 232a~232c, 233a~233c, 234a~23 6 35a-635c, 732a, 733a, 734a, 735a, 736a, 737a, 738a, 739a, outer wall surface; 140, 150, 240, 250, 340, 350, 440, 450, 540, 550, 640, 650, 740, 750, flange portion; 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 surface;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, outer wall surface; 160, 260, 360, 460, 560, 660, 760, main body; 162a-162d, 262a-262d, 362a-362d, 46 2a~462d, 562a~562d, 662a~662d, 762a~762d, outer wall surface; 170a~170d, 270a~270d, 370a~370d, 470a~470d, 570a~570d, 670a~670d, 770a~770d, concave portion; 170, stator winding; 180, rotor; 190, rotor core; 190A, 190B, rotor core end surface; 191, rotor core inner circumference surface; 192, rotor core outer circumference surface; 220, stator core; 220A, stator core end surface; 221, yoke portion; 221a, 221c, inner circumference of the yoke; 221c1, 221c2, inner circumference of the yoke; 221d, outer circumference of the yoke; 221e, 221f, side of the yoke; 222, 222(1), 222(2), tooth; 222a, end of the tooth; 222c, 222d, side of the tooth; 222e, inner circumference of the tooth; 225, 225(1), 225(2), core member; 320, stator core; 320A, end of the stator core; 321, yoke; 321a, end of the yoke; 321c, inner circumference of the yoke; 321c1 to 321c3, The inner peripheral surface of the yoke; 321d, the outer peripheral surface of the yoke; 321e, the concave portion; 322A, the base of the tooth; 322B, the top of the tooth; 322, the base; 322a, the end surface of the base; 322c, 322d, the side surface of the base; 322e, the outer peripheral surface of the base; 323, the top; 323a, the end surface of the top; 323c, the inner peripheral surface of the top; 323d, the outer peripheral surface of the top; 323d1, 323d2, the outer peripheral surface of the top; 323e, 323f, the side surface of the top; 325A, the first core member; 325B, 325B(1), 325B(2), the second core member. DETAILED DESCRIPTION

[0093] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings.

[0094] In this specification, in a state where the rotor is rotatably arranged on the stator, the rotor center line P (refer to Figure 1 , Figure 2) 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).

[0095] In addition, 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”.

[0096] In addition, the extending direction (Z direction) of a line passing through the stator center line P when viewed from one axial side is referred to as the "radial direction." The description "radially inside" means the side (Z1 side) of the stator center line P in the radial direction, and the description "radially outside" means the side (Z2 side) opposite to the stator center line P in the radial direction.

[0097] Regarding the electric insulator assembly, the descriptions of “axial direction”, “circumferential direction” and “radial direction” mean the “axial direction”, “circumferential direction” and “radial direction” in a state where the electric insulator assembly is arranged in the stator (stator core).

[0098] In addition, the following Figure 1 Above the middle paper ( Figure 2 The upper side of the paper is called the "first axial side" (X1 side). Figure 1 Below the middle paper ( Figure 2 The side (below the center paper) is called the "second axial side" (X2 side).

[0099] In addition, from Figure 1 When viewed from above the paper (from Figure 2 (When viewed from above the paper surface) the clockwise direction (Y1 direction) centered on the stator center line P is called the "circumferential first side", and the counterclockwise direction (Y2 direction) is called the "circumferential second side".

[0100] Of course, the “first side in the axial direction”, the “second side in the axial direction”, the “first side in the circumferential direction”, and the “second side in the circumferential direction” may be opposite directions.

[0101] Reference Figure 1 A first embodiment of the compressor of the present application will be described. Figure 1 It is a cross-sectional view schematically showing the structure of the compressor 10 according to the first embodiment.

[0102] The compressor 10 includes a closed container 20 , a compression mechanism 30 accommodated in the closed container 20 , and a motor 100 .

[0103] The sealed container 20 is formed of a cylindrical main body 20A, a cover 20B attached to one axial side of the main body 20A, and a bottom 20C attached to the other axial side of the main body 20A.

[0104] The sealed container 20 is provided with a suction pipe 22 and a discharge pipe 23 .

[0105] The compression mechanism 30 compresses a working medium (referred to as a "refrigerant") that transfers heat energy. As the working medium, for example, an HFC (hydrofluorocarbon) refrigerant is used.

[0106] The compression mechanism 30 is composed of a cylinder 31, an eccentric rotor 32 that rotates through a rotating shaft 40, and a compression chamber 33. The rotating shaft 40 is rotatably supported by bearings 24 and 25. When the eccentric rotor 32 rotates due to the rotation of the rotating shaft 40, the working medium sucked from the suction pipe 22 is compressed in the compression chamber 33. Then, the compressed working medium is ejected from the ejection pipe 23 via the ejection port 33a and the passage provided in the motor 100.

[0107] exist Figure 1 In the embodiment, the compression mechanism 30 and the motor 100 are arranged left and right along the vertical direction. Figure 1 The compression mechanism shown is called a vertical compressor.

[0108] In addition, Figure 1 In the embodiment, the electric motor 100 is arranged above the compression mechanism 30 (on the first side in the axial direction), but the electric motor 100 may be arranged below the compression mechanism 30 (on the second side in the axial direction).

[0109] In addition, the compression mechanism 30 and the motor 100 may be arranged horizontally. That is, the compressor 10 may be configured as a horizontal compressor. In this case, the arrangement positions of the compression mechanism 30 and the motor 100 in the horizontal direction may be changed as appropriate.

[0110] The electric motor 100 is composed of a stator 110 and a rotor 180 .

[0111] The stator 110 is composed of a stator core 120 , a plurality of electrical insulator assemblies 130 , and a stator winding 170 .

[0112] The stator core 120 (details of which will be described later) is composed of a plurality of electromagnetic steel sheets stacked in the axial direction.

[0113] The stator core 120 is formed in a cylindrical shape, and has a stator core end face 120A on the first axial side and a stator core end face 120B on the second axial side. In addition, the stator core 120 has a stator core inner peripheral surface (tooth inner peripheral surface 122e described later) and a stator core outer peripheral surface (yoke outer peripheral surface 121d described later). The stator core inner peripheral surface (tooth inner peripheral surface 122e) forms a stator core inner space 120a.

[0114] 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 in the radial direction.

[0115] A plurality of electrical insulator assemblies 130 (details of which will be described later) are respectively attached to the teeth 122 of the stator core 120 so as to cover the peripheries of the teeth 122 .

[0116] The stator winding 170 (more specifically, the conductive wire constituting the stator winding 170 ) is wound around the outer circumference of each of the plurality of electrical insulator assemblies 130 .

[0117] The rotor 180 is composed of a rotor core 190 and a rotating shaft 40 .

[0118] The rotor core 190 is composed of a plurality of electromagnetic steel sheets stacked in the axial direction. The rotor core 190 is formed in a cylindrical shape, and has a rotor core end face 190A on the first axial side and a rotor core end face 190B on the second axial side. In addition, the rotor core 190 has a rotor core inner peripheral face 191 and a rotor core outer peripheral face 192. The rotor core 190 is rotatably arranged in the stator core inner space 120a.

[0119] Rotating shaft 40 is inserted into the rotor core inner space formed by rotor core inner peripheral surface 191 by press fitting or the like.

[0120] The electric motor 100 corresponds to one embodiment of the electric motor of the present application.

[0121] The stator 110 corresponds to one embodiment of the stator of the present application.

[0122] The stator core 120 corresponds to the first embodiment of the stator core of the present application.

[0123] The electric insulator assembly 130 corresponds to the first embodiment of the electric insulator assembly of the present application.

[0124] Next, refer to Figure 2 to Figure 7 The structure of stator 110 will be described.

[0125] The stator 110 is composed of a stator core 120, a plurality of electrical insulator assemblies 130, and a stator winding 170. Figure 2 , Figure 3 In order to facilitate observation of the assembly state of the stator core 120 and the electrical insulator assembly 130 , the stator winding 170 is omitted from illustration.

[0126] First, refer to Figure 4 The structure of stator core 120 will be described. Figure 4 is a top view of the stator core 120 .

[0127] The stator core 120 has a yoke 121 and a plurality of teeth 122 .

[0128] The yoke 121 extends in the circumferential direction. The yoke 121 has a yoke end face 121a, a yoke end face 121b (not shown), a yoke inner circumferential surface 121c, and a yoke outer circumferential surface 121d. The yoke inner circumferential surface 121c extends along the side of a regular polygon corresponding to the number of teeth 122. In the present embodiment, it extends along the side of a regular dodecagon (the number of teeth = 12). In addition, in the present embodiment, the yoke inner circumferential surface 121c has a yoke inner circumferential surface portion 121c1 formed on the first side in the circumferential direction and a yoke inner circumferential surface portion 121c2 formed on the second side in the circumferential direction. The yoke outer circumferential surface 121d extends along a circle centered on the stator center line P.

[0129] The plurality of teeth 122 are arranged at equal intervals and separately in the circumferential direction, and extend radially from the yoke 121 toward the radial inner side. The teeth 122 have a tooth end face 122a formed on the first axial side, a tooth end face 122b (not shown) formed on the second axial side, a tooth side face 122c formed on the first circumferential side, a tooth side face 122d formed on the second circumferential side, and a tooth inner circumferential surface 122e formed on the radial inner side. The tooth end faces 122a and 122b extend in the radial and circumferential directions. The tooth side faces 122c and 122d extend in the radial and axial directions. The tooth inner circumferential surface 122e extends along an arc centered on the stator center line P. The stator core inner space 120a is formed by the tooth inner circumferential surface 122e.

[0130] In addition, the radial extension direction of the tooth 122 shows the extension direction of the center line of the tooth 122. Therefore, the radial extension direction of the tooth 122 is different in each tooth 122. For example, Figure 4 As shown, the radial extension direction of the tooth 122 ( 1 ) is different from the radial extension direction of the tooth 122 ( 2 ). The same is true for the radial extension direction of the insulator assembly 130 mounted on the tooth 122 .

[0131] The yoke end face 121 a and the tooth end face 122 a form a stator core end face 120A on the first axial side, and the yoke end face 121 b and the tooth end face 122 b form a stator core end face 120B on the second axial side.

[0132] A slit is formed by two teeth adjacent to each other in the circumferential direction.

[0133] In the stator core 120 of the present embodiment, the tooth side surface 122c, tooth side surface 122d, tooth end surface 122a, and tooth end surface 122b of the tooth 122 respectively correspond to the "first outer wall surface", "second outer wall surface", "third outer wall surface", and "fourth outer wall surface" of the present application.

[0134] Next, refer to Figure 5 to Figure 7 The structure of the electrical insulator assembly 130 will be described.

[0135] Figure 5is a perspective view of electrical insulator assembly 130 . Figure 6 Observed from the direction of arrow VI Figure 5 The obtained picture, Figure 7 Observed from the direction of arrow VII Figure 5 The obtained picture.

[0136] The electrical insulator component 130 is formed of 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.

[0137] The electrical insulator assembly 130 is also referred to as a “resin bobbin”, “electrical insulator”, “coil bobbin”, or the like.

[0138] The electrical insulator assembly 130 includes a first flange portion 140 , a second flange portion 150 , and a main body portion 160 .

[0139] The first flange portion 140 extends in the axial direction and the circumferential direction.

[0140] The first flange portion 140 has an end surface 141 on the radially inner side and an end surface 142 on the radially outer side.

[0141] Furthermore, the first flange portion 140 has an outer wall surface 143a on the first side in the axial direction, an outer wall surface 143b on the second side in the axial direction, an outer wall surface 143c on the first side in the circumferential direction, and an outer wall surface 143d on the second side in the circumferential direction.

[0142] The second flange portion 150 is disposed radially inward of the first flange portion 140 , and extends in the axial direction and the circumferential direction.

[0143] The second flange portion 150 has an end surface 151 on the radially inner side and an end surface 152 on the radially outer side.

[0144] Furthermore, the second flange portion 150 has an outer wall surface 153a on the first side in the axial direction, an outer wall surface 153b on the second side in the axial direction, an outer wall surface 153c on the first side in the circumferential direction, and an outer wall surface 153d on the second side in the circumferential direction.

[0145] The main body portion 160 is provided between the first flange portion 140 and the second flange portion 150 and extends in the radial direction.

[0146] The main body 160 has a through hole 130 a extending in the radial direction.

[0147] The through hole 130a opens at the end surface 142 of the first flange portion 140 and the end surface 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 the first axial side, the second axial side, the first circumferential side, and the second circumferential side, respectively. The inner wall surfaces 131a and 131b extend in the radial direction and the circumferential direction. In addition, the inner wall surfaces 131c and 131d extend in the radial direction and the axial direction. The inner wall surfaces 131a to 131d are respectively opposite to the tooth end surfaces 122a and 122b and the tooth side surfaces 122c and 122d of the tooth 122 when the tooth 122 is inserted into the through hole 130a.

[0148] A protrusion that protrudes toward the inside of the through hole 130 a is formed on the inner wall surface.

[0149] In this embodiment, two projections 132 and 133 are formed on the inner wall surface 131c so as to be separated in the axial direction. In addition, two projections 134 and 135 are formed on the inner wall surface 131d so as to be separated in the axial direction.

[0150] The protrusions 132 to 135 have a quadrilateral cross section and are composed of a single protrusion portion extending parallel to (including “substantially parallel to”) the radial direction.

[0151] The protrusion 132 (133) has an outer wall surface 132a (133a) formed on the second side in the circumferential direction, an outer wall surface 132b (133b) formed on the first side in the axial direction, and an outer wall surface 132c (133c) formed on the second side in the axial direction.

[0152] The protrusion 134 (135) has an outer wall surface 134a (135a) formed on the first side in the circumferential direction, an outer wall surface 134b (135b) formed on the first side in the axial direction, and an outer wall surface 134c (135c) formed on the second side in the axial direction.

[0153] When the tooth 122 is inserted into the through hole 130a, the tooth side surface 122c abuts against the outer wall surface 132a of the protrusion 132 and the outer wall surface 133a of the protrusion 133, and the tooth side surface 122d abuts against the outer wall surface 134a of the protrusion 134 and the outer wall surface 135a of the protrusion 135, thereby suppressing the electrical insulator assembly 130 from moving relative to the tooth 122.

[0154] In the present embodiment, the projections 132 and 133 are formed to be separated from the axial center of the inner wall surface 131c by an equal distance. The projections 134 and 135 are formed to be separated from the axial center of the inner wall surface 131d by an equal distance. In addition, the projections 134 and 135 are formed at positions opposite to the projections 132 and 133 in the circumferential direction. Thus, the electrical insulator assembly 130 is stably held on the tooth 122.

[0155] The distance between the protrusions 132 and 133 ( 134 and 135 ) and the axial center of the inner wall surface 131 c ( 131 d ) can be appropriately set.

[0156] In addition, when the projections 132 to 135 included in the first group of projections extend parallel to the radial direction (including "substantially parallel"), when the tooth 122 is inserted into the through hole 130a, any of the projections 132 to 135 may be embedded between the stacked electromagnetic steel sheets constituting the stator core 120. When any of the projections 132 to 135 is embedded between the stacked electromagnetic steel sheets, the electrical insulator assembly 130 is prevented from moving in the axial direction relative to the tooth 122.

[0157] In the above, two protrusions separated in the axial direction are formed on the inner wall surface 131c (131d), but one or three or more protrusions may be formed.

[0158] The yoke 121 and teeth 122 of the stator core 120 are generally formed of a plurality of electromagnetic steel sheets formed by punching an electromagnetic steel sheet base material. When the electromagnetic steel sheets constituting the teeth 122 are formed by punching an electromagnetic steel sheet base material, burrs may be generated on the electromagnetic steel sheets.

[0159] If burrs are generated on the teeth 122 (more specifically, the electromagnetic steel sheet constituting the teeth 122), the burrs generated on the teeth may interfere with the inner wall surfaces 131a to 131d forming the through-hole 130a when the teeth 122 are inserted into the through-hole 130a of the electrical insulator assembly 130. If the burrs generated on the teeth interfere with the inner wall surfaces 131a to 131d, it is difficult to insert the teeth 122 into the through-hole 130a.

[0160] In the electric insulator assembly of the present application, the recessed portion is formed at a portion of the tooth 122 that is opposite to a portion where burrs may be generated.

[0161] In the electrical insulator assembly 130 of the present embodiment, recesses 170a to 170d are formed that are recessed toward the outside of the through hole 130a. The recess 170a is formed at the boundary between the inner wall surface 131a and the inner wall surface 131c, and is composed of a groove extending in the radial direction. The recess 170b is formed at the boundary between the inner wall surface 131a and the inner wall surface 131d, and is composed of a groove extending in the radial direction. The recess 170c is formed at the boundary between the inner wall surface 131b and the inner wall surface 131c, and is composed of a groove extending in the radial direction. The recess 170d is formed at the boundary between the inner wall surface 131b and the inner wall surface 131d, and is composed of a groove extending in the radial direction.

[0162] The recessed portions 170a to 170d are configured to suppress interference between burrs generated on the teeth 122 and the inner wall surfaces 131a to 131d when the teeth 122 are inserted into the through-holes 130a. For example, the recessed portions 170a to 170d are formed to accommodate burrs generated on the teeth 122.

[0163] The electrical insulator assembly 130 of the present embodiment forms the recessed portions 170 a to 170 d , so that even when burrs are generated on the teeth 122 , the teeth 122 can be easily inserted into the through-holes 130 a .

[0164] In addition, Figure 5 In the illustrated electrical insulator assembly 130, recesses are formed at four boundaries respectively, but the recesses only need to be formed at boundaries facing the portions of the teeth 122 where burrs may be generated. In other words, the recesses only need to be formed at at least one boundary.

[0165] The shapes of the recessed portions 170 a to 170 d are set according to the shapes of the burrs generated on the teeth 122 .

[0166] The main body 160 has an outer wall surface 162a formed on the first side in the axial direction, an outer wall surface 162b formed on the second side in the axial direction, an outer wall surface 162c formed on the first side in the circumferential direction, and an outer wall surface 162d formed on the second side in the circumferential direction.

[0167] The first flange 140 and the second flange 150 are formed to protrude from the outer wall surfaces 162a to 162d of the main body 160. Thus, a space for winding the stator winding 170 (more specifically, the conductor constituting the stator winding 170) is formed between the first flange 140 and the second flange 150 and the outer wall surfaces 162a to 162d of the main body 160.

[0168] Various methods can be used as a method of winding the stator winding 170 around the electric insulator assembly 130. For example, a method of attaching the electric insulator assembly 130 to the teeth 122 while the stator winding 170 is wound around the electric insulator assembly 130 can be used. Alternatively, a method of winding the stator winding 170 around the electric insulator assembly 130 while the electric insulator assembly 130 is attached to the teeth 122 can be used.

[0169] In the electrical insulator assembly 130 of the present embodiment, the through hole 130 a corresponds to the “tooth insertion hole” of the present application.

[0170] In addition, the inner wall surfaces 131c, 131d, 131a, and 131b of the 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 application, respectively.

[0171] In addition, 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" of the present application, 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" of the present application.

[0172] The protrusions 132 and 133 and the protrusions 134 and 135 constitute the “first group of protrusions” of the present application.

[0173] In addition, the boundary between the inner wall surface 131a and the inner wall surface 131c corresponds to the "first boundary" of the present application, the boundary between the inner wall surface 131a and the inner wall surface 131d corresponds to the "second boundary" of the present application, the boundary between the inner wall surface 131b and the inner wall surface 131c corresponds to the "third boundary" of the present application, and the boundary between the inner wall surface 131b and the inner wall surface 131d corresponds to the "fourth boundary" of the present application.

[0174] In addition, the recessed portions 170a to 170d correspond to the “first recessed portion”, “second recessed portion”, “third recessed portion”, and “fourth recessed portion” of the present application, respectively.

[0175] Next, refer to Figure 8 The operation of attaching the electrical insulator assembly 130 to the tooth 122 will be described.

[0176] When the electrical insulator assembly 130 is mounted on the tooth 122, the tooth 122 is inserted into the through hole 130a of the electrical insulator assembly 130. In the present embodiment, the tooth inner peripheral surface 122e of the tooth 122 is inserted into the through hole 130a from the first flange portion 140 side. At this time, the tooth 122 is inserted into the through hole 130a so that the tooth side surfaces 122c, 122d and the tooth end surfaces 122a, 122b of the tooth 122 are opposed to the inner wall surfaces 131c, 131d, 131a, 131b of the through hole 130a, respectively.

[0177] A configuration may be adopted in which an inclined surface is formed on the inner wall surfaces 131 a to 131 d of the through hole 130 a on the side of the end surface 142 of the first flange portion 140 to guide the teeth 122 into the through hole 130 a .

[0178] The tooth 122 is inserted into the through hole 130 a so that the tooth inner peripheral surface 122 e protrudes from the end surface 151 of the second flange portion 150 .

[0179] Furthermore, even 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-hole 130 a from the second flange portion 150 side.

[0180] The tooth side surface 122c contacts the projections 132 and 133 formed on the inner wall surface 131c, and the tooth side surface 122d contacts the projections 134 and 135 formed on the inner wall surface 131d, so that the insulator assembly 130 of this embodiment is attached to the tooth 122 in a state where movement relative to the tooth 122 is suppressed.

[0181] That is, the width m (see Figure 6 , Figure 7 ) is set to be greater than the width of the tooth 122 along the circumferential direction (the width of the tooth end faces 122a, 122b along the circumferential direction) M (refer to Figure 8 ) is slightly smaller.

[0182] The width m is set based on the ease of inserting the tooth 122 into the through hole 130 a and the effect of suppressing the electrical insulator assembly 130 from moving relative to the tooth 122 .

[0183] In this embodiment, the tooth side surfaces 122c and 122d abut against the projections 132 and 133 and the projections 134 and 135 respectively, thereby limiting the circumferential movement of the insulator assembly 130 relative to the tooth 122 and suppressing the axial and radial movement of the insulator assembly 130 relative to the tooth 122.

[0184] In this embodiment, the contact area between the tooth side surface 122c and the protrusions 132, 133 and the contact area between the tooth side surface 122d and the protrusions 134, 135 are smaller than the contact area between the tooth side surface 122c and the inner wall surface 131c and the contact area between the tooth side surface 122d and the inner wall surface 131d in the prior art.

[0185] Therefore, the insertion resistance when the tooth 122 is inserted into the through hole 130a is small.

[0186] Furthermore, by adjusting the heights of the projections 132 and 133 (the lengths protruding from the inner wall surface 131 c ) and the heights of the projections 134 and 135 (the lengths protruding from the inner wall surface 131 d ), the force holding the insulator assembly 130 to the teeth 122 can be increased.

[0187] Furthermore, in the present embodiment, the electrical insulator assembly 130 can be held on the tooth 122 by the abutment between the tooth side surface 122c and the protrusions 132, 133, and the abutment between the tooth side surface 122d and the protrusions 134, 135. Therefore, there is no need for the abutment between the tooth end surface 122a and the inner wall surface 131a, and the abutment between the tooth end surface 122b and the inner wall surface 131b as in the prior art.

[0188] For example, the length n between the inner wall surface 131a and the inner wall surface 131b along the axial direction (see Figure 6 , Figure 7 ) and the axial length of the tooth 122 (the length between the tooth end face 122a and the tooth end face 122b) N (refer to Figure 8 ) is approximately equal to or slightly greater than the length N.

[0189] In this case, when the tooth 122 is inserted into the through hole 130a, the load in the radial direction applied to the tooth end surface 122a and the tooth end surface 122b is reduced.

[0190] The teeth 122 are formed of a plurality of electromagnetic steel sheets stacked in the axial direction.

[0191] In the present embodiment, when the teeth 122 are inserted into the through-holes 130a, an excessive load is prevented from being applied to the electromagnetic steel sheets arranged on the axial first and second sides of the teeth 122 along the extending direction of the electromagnetic steel sheets.

[0192] This can suppress deformation of the electromagnetic steel sheets disposed on the first and second axial sides of the teeth 122 .

[0193] Furthermore, the inner wall surface 131a contacts the outer wall surface 122a to restrict movement of the electric insulator assembly 130 toward the second axial side, and the inner wall surface 131b contacts the outer wall surface 122b to restrict movement of the electric insulator assembly 130 toward the first axial side.

[0194] In the electrical insulator assembly of the first embodiment, two protrusions are formed on the inner wall surface on the first circumferential side and the inner wall surface on the second circumferential side, respectively. However, 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 thereto.

[0195] In the above, the stator core is constituted by one core member, but the stator core may be constituted by a plurality of core members.

[0196] Reference Fig. 9 The stator core 220 according to the second embodiment will be described.

[0197] The stator core 220 of the present embodiment is composed of a plurality of core members 225. The core member 225 is composed of a plurality of electromagnetic steel sheets stacked in the axial direction.

[0198] The core member 225 has a yoke portion 221 extending in the circumferential direction and teeth portions 222 extending radially inward from the yoke portion 221 in the radial direction.

[0199] The yoke portion 221 has a yoke portion end face 221a, a yoke portion end face 221b (not shown), a yoke portion inner peripheral surface 221c, a yoke portion outer peripheral surface 221d, and a yoke portion side surface. The yoke portion inner peripheral surface 221c has a yoke portion inner peripheral surface portion 221c1 formed on the first side in the circumferential direction and a yoke portion inner peripheral surface portion 221c2 formed on the second side in the circumferential direction. In addition, the yoke portion side surface has a yoke portion side surface 221e formed on the first side in the circumferential direction and a yoke portion side surface 221f formed on the second side in the circumferential direction.

[0200] The tooth portion 222 has a tooth portion end face 222a, a tooth portion end face 222b (not shown), a tooth portion side face 222c formed on the first circumferential side, a tooth portion side face 222d formed on the second circumferential side, and a tooth portion inner peripheral face 222e formed radially inward.

[0201] The stator core 220 is formed by arranging a plurality of core elements 225 in the circumferential direction. At this time, the yoke side surface 221e of one core element 225 and the yoke side surface 221f of the other core element 225 adjacent to each other in the circumferential direction are joined by welding or the like.

[0202] 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.

[0203] The teeth inner circumferential surface 222 e of the core element 225 extends along an arc centered on the stator core center line P. The stator core inner space 220 a is formed by the teeth inner circumferential surface 222 e of each core element 225 .

[0204] The core end face 220A (220B) of the stator core 220 is formed by the yoke end face 221a (221b) and the tooth end face 222a (222b) of each core member 225. The yoke of the stator core 220 is formed by the yoke portion 221 of each core member 225. The plurality of teeth of the stator core 220 are formed by the tooth portion 222 of each core member 225.

[0205] In the stator core 220 of the present embodiment, the tooth portion 222 corresponds to the "tooth" of the present application, and the tooth side surface 222c, tooth side surface 222d, tooth end face 222a, and tooth end face 222b of the tooth portion 222 respectively correspond to the "first outer wall surface", "second outer wall surface", "third outer wall surface", and "fourth outer wall surface" of the present application.

[0206] Reference Fig.10 , Fig.11 A stator core 320 according to the third embodiment will be described.

[0207] The stator core 320 of the present 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 sheets stacked in the axial direction.

[0208] The first core member 325A includes a yoke portion 321 extending in the circumferential direction.

[0209] The yoke portion 321 has a yoke portion end face 321a, a yoke portion end face 321b (not shown), a yoke portion inner peripheral surface 321c, and a yoke portion outer peripheral surface 321d. The yoke portion inner peripheral surface 321c has yoke portion inner peripheral surface portions 321c1 to 321c3. The yoke portion inner peripheral surface portions 321c1 and 321c3 extend along the sides of a regular polygon corresponding to the number of teeth. The yoke portion inner peripheral surface portion 321c2 forms a recessed portion 321e that is recessed radially outward from the yoke portion inner peripheral surface 321c (yoke portion inner peripheral surface portions 321c1 and 321c3).

[0210] The second core member 325B includes a base portion 322 extending in the radial direction and a tip portion 323 formed radially inside the base portion 322 and extending in the circumferential direction.

[0211] The base 322 has a base end surface 322a, a base end surface 322b (not shown), a base side surface 322c, a base side surface 322d, and a base outer peripheral surface 322e.

[0212] The top end 323 has a top end face 323a, a top end face 323b (not shown), a top inner peripheral face 323c, a top outer peripheral face 323d, and a top side face. The top outer peripheral face 323d has a top outer peripheral face portion 323d1 formed on the first side in the circumferential direction and a top outer peripheral face portion 323d2 formed on the second side in the circumferential direction. In addition, the top side face has a top side face 323e formed on the first side in the circumferential direction and a top side face 323f formed on the second side in the circumferential direction.

[0213] The stator core 320 is formed by inserting the base outer peripheral surface 322 e of the base 322 of each second core element 325B into each recess 321 e of the first core element 325A by press fitting or the like.

[0214] The inner peripheral surface 323c of the front end portion of the second core element 325B extends along an arc centered on the stator core center line P. The stator core inner space 320a is formed by the inner peripheral surface 323c of the front end portion of the second core element 325B.

[0215] The core end surface 320A (320B) of the stator core 320 is formed by the yoke end surface 321a (321b) of the first core member 325A, the base end surface 322a (322b) and the tip end surface 323a (323b) of the second core member 325B.

[0216] The yoke portion 321 of the first core element 325A constitutes a yoke of the stator core 320. The base portion 322 and the tip portion 323 of the second core element 325B constitute a plurality of teeth of the stator core 320.

[0217] In the present embodiment, each tooth is formed by a tooth base 322A extending in the radial direction and a tooth tip 322B provided radially inwardly of the tooth base 322A and extending in the circumferential direction. The tooth base 322A is formed by the base end faces 322a, 322b and the base side faces 322c, 322d of the second core member 325B. The tooth tip 322B is formed by the tip end faces 323a, 323b, the tip inner peripheral face 323c, and the tip outer peripheral face 323d (the tip outer peripheral face portions 323d1, 323d2) of the second core member 325B.

[0218] In the stator core 320 of the present embodiment, the base portion 322 (tooth base portion 322A) corresponds to the “tooth inserted into the tooth insertion hole” of the present application.

[0219] In addition, the base side surface 322c, the base side surface 322d, the base end surface 322a, and the base end surface 322b of the base 322 respectively correspond to the "1st outer wall surface", "2nd outer wall surface", "3rd outer wall surface", and "4th outer wall surface" of the present application.

[0220] Various embodiments of the electrical insulator assembly are described below.

[0221] The electrical insulator assembly of the different embodiments described below differs only in the number, arrangement position, and extension direction of the protrusions, and the other structures (first flange, second flange, main body, through hole, inner wall surface) are the same as the electrical insulator assembly 130 of the first embodiment. Therefore, only the protrusions will be described below.

[0222] In addition, Figure 12 to Figure 22 In the drawings, the same reference numerals as those of the first flange portion, the second flange portion, the main body portion, the through hole, the inner wall surface, etc. of the electrical insulator assembly 130 of the first embodiment are given with the third digit being different but the other digits being the same.

[0223] Reference Fig.12 , Fig.13 An electrical insulator assembly 230 according to the second embodiment will be described.

[0224] In the present embodiment, two protrusions 232 and 233 are formed on the inner wall surface 231 c (first inner wall surface), and two protrusions 234 and 235 are formed on the inner wall surface 231 d (second inner wall surface).

[0225] Furthermore, the projections 232 to 235 extend in a direction inclined with respect to the radial direction. In addition, the projections 232 to 235 are composed of a continuous single projection portion.

[0226] In the present embodiment, the protrusions 232 to 235 are inclined in such a manner that the distance from the inner wall surface 231a becomes shorter as they go from the radial outer side (Z2 side) toward the radial inner side (Z1 side) (so that the distance from the inner wall surface 231b becomes longer). Alternatively, they may be inclined in such a manner that the distance from the inner wall surface 231a becomes longer as they go from the radial outer side (Z2 side) toward the radial inner side (Z1 side). The inclination angle can be set appropriately.

[0227] In the present embodiment, the protrusions 232 and 233 and the protrusions 234 and 235 constitute the “first group of protrusions” of the present application.

[0228] The electric insulator assembly 230 of this embodiment has the same effect as the electric insulator assembly 130 of the first embodiment. In addition, 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 electric insulator assembly 130 of the first embodiment, so that the movement of the electric insulator assembly 230 relative to 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.

[0229] Reference Fig.14 , Fig.15 An electrical insulator assembly 330 according to the third embodiment will be described.

[0230] In this embodiment, two protrusions 332 and 333 are formed on the inner wall surface 331c (first inner wall surface), and one protrusion 334 is formed on the inner wall surface 331d (second inner wall surface). The protrusions 332 to 334 extend parallel to the radial direction (including "substantially parallel"). The protrusions 332 to 334 are composed of a continuous protrusion portion.

[0231] The protrusion 334 is formed at the center of the inner wall surface 331d in the axial direction. In addition, the protrusions 332 and 333 are formed to be separated from the protrusion 334 by an equal distance in the axial direction.

[0232] In the present embodiment, the protrusions 332 , 333 and the protrusion 334 constitute the “first group of protrusions” of the present application.

[0233] The electrical insulator assembly 330 of the present embodiment has the same effects as the electrical insulator assembly 130 of the first embodiment, although a smaller number of protrusions are used.

[0234] The arrangement positions and extending directions of the protrusions 332 to 334 can be changed as appropriate.

[0235] Alternatively, one protrusion may be formed on the inner wall surface 331 c (first inner wall surface), and two protrusions may be formed on the inner wall surface 331 d (second inner wall surface).

[0236] Reference Fig.16 , Fig.17 An electric insulator assembly 430 according to a fourth embodiment will be described.

[0237] In this embodiment, one protrusion 432 is formed on the inner wall surface 431c (first inner wall surface), and one protrusion 433 is formed on the inner wall surface 431d (second inner wall surface). The protrusions 432 and 433 extend parallel to the radial direction (including "substantially parallel") and are composed of a continuous protrusion portion.

[0238] In this embodiment, in order to stably hold the electrical insulator assembly 430 on the tooth, the width of the protrusions 432 and 433 along the axial direction is set to be large (wide). In addition, the protrusions 432 and 433 are formed in the center of the inner wall surfaces 431c and 431d in the axial direction. The width of the protrusions 432 and 433 can be appropriately set.

[0239] In the present embodiment, the protrusion 432 and the protrusion 433 constitute the “first group of protrusions” of the present application.

[0240] The electrical insulator assembly 430 of the present embodiment has the same effects as the electrical insulator assembly 130 of the first embodiment, although using a smaller number of protrusions.

[0241] The arrangement positions and extending directions of the protrusions 432 and 433 can be changed as appropriate.

[0242] Reference Fig.18 , Fig.19 An electric insulator assembly 530 according to a fifth embodiment will be described.

[0243] In this embodiment, a protrusion 532 is formed on the inner wall surface 531c (first inner wall surface), and a protrusion 533 is formed on the inner wall surface 531d (second inner wall surface). The protrusions 532 and 533 extend parallel to the axial direction (including "substantially parallel"). The protrusions 532 and 533 are formed at the center of the inner wall surfaces 531c and 531d in the radial direction. The protrusions 532 and 533 are composed of a continuous protrusion portion.

[0244] The widths of the outer wall surface 532 a of the protrusion 532 formed on the second side in the circumferential direction and the outer wall surface 533 a of the protrusion 533 formed on the first side in the circumferential direction can be appropriately set.

[0245] In the present embodiment, the protrusion 532 and the protrusion 533 constitute the “first group of protrusions” of the present application.

[0246] The electrical insulator assembly 530 of the present embodiment has the same effects as the electrical insulator assembly 130 of the first embodiment, although using a smaller number of protrusions.

[0247] The arrangement positions and extending directions of the protrusions 532 and 533 can be changed as appropriate.

[0248] Reference Fig. 20 , Fig.21 An electric insulator assembly 630 according to the sixth embodiment will be described.

[0249] 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 "substantially parallel") and are composed of a continuous protrusion portion.

[0250] The projections 636 and 637 and the projections 638 and 639 are formed at positions facing each other in the axial direction. The projections 636 and 637 are formed at equal distances from the center of the inner wall surface 631a in the circumferential direction. The projections 638 and 639 are formed at equal distances from the center of the inner wall surface 631b in the circumferential direction.

[0251] In the present embodiment, the protrusions 636 and 637 and the protrusions 638 and 639 constitute the “second group of protrusions” of the present application.

[0252] The tooth side surface formed on the first axial side abuts against the projections 636 and 637 , and the tooth side surface formed on the second axial side abuts against the projections 638 and 639 , so that the electrical insulator assembly 630 of this embodiment is attached to the tooth in a state where movement relative to the tooth is suppressed.

[0253] That is, the length n (see Fig.21 ) is set to the length N of the tooth along the axial direction (refer to Figure 8 ) is slightly smaller.

[0254] The length n is set based on the insertion workability of the teeth into the through-holes 630 a and the effect of suppressing the movement of the electrical insulator assembly 630 relative to the teeth.

[0255] In this embodiment, the tooth end faces formed on both axial sides abut against the projections 636 to 639 , thereby restricting the axial movement of the electric insulator assembly 630 relative to the teeth and suppressing the circumferential and radial movement of the electric insulator assembly 630 relative to the teeth.

[0256] In the electrical insulator assembly 630 of the present embodiment, when the teeth are inserted into the through-hole 630a, radial loads are applied to the tooth end faces on the first axial side and the second axial side. That is, loads are applied to the electromagnetic steel sheets arranged on the first axial side and the second axial side of the teeth in the extending direction of the electromagnetic steel sheets.

[0257] However, in this embodiment, the contact area between the tooth end faces on the first and second axial sides and the protrusions 636 to 639 is smaller than the contact area between the tooth end faces on the first and second axial sides and the inner wall surfaces on the first and second axial sides in the prior art. Therefore, the resistance when inserting the tooth into the through hole 630a is small.

[0258] By adjusting the height of the protrusions 636 to 639 (the length protruding from the inner wall surfaces 631a and 631b), the force that holds the electrical insulator assembly 630 on the tooth due to the contact between the tooth end surface and the protrusions 636 to 639 can be increased while facilitating the insertion operation of inserting the tooth into the through hole 630a.

[0259] The number and arrangement positions 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.

[0260] Reference Fig. 22 An electric insulator assembly 730 according to the seventh embodiment will be described.

[0261] In this embodiment, similarly to the electrical insulator assembly 130 of the first embodiment, two protrusions 732 and 733 are formed on the inner wall surface 731c (first inner wall surface), and two protrusions 734 and 735 are formed on the 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 the inner wall surface 731a (third inner wall surface), and two protrusions 738 and 739 are formed on the inner wall surface 731b (fourth inner wall surface).

[0262] In the electrical insulator assembly 730 of the present embodiment, the protrusions 732 and 733 and the protrusions 734 and 735 constitute the “first group of protrusions” of the present application, and the protrusions 736 and 737 and the protrusions 738 and 739 constitute the “second group of protrusions” of the present application.

[0263] In the electrical insulator assembly 730 of the present application, the outer wall surface of the tooth formed on the first circumferential side abuts against the protrusions 732 and 733, the outer wall surface formed on the second circumferential side abuts against the protrusions 734 and 735, the outer wall surface of the tooth formed on the first axial side abuts against the protrusions 736 and 737, and the outer wall surface formed on the second axial side abuts against the protrusions 738 and 739, thereby suppressing the movement of the electrical insulator assembly 730 relative to the teeth.

[0264] In addition, 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.

[0265] The present application can be configured as follows.

[0266] (Technical Solution 1) An electrical insulator assembly having a tooth insertion hole for inserting a tooth, the tooth extending in a radial direction and having a first outer wall surface, a second outer wall surface, a third outer wall surface, and a fourth outer wall surface formed on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, the electrical insulator assembly being configured to insert the tooth into the tooth insertion hole in a state where movement relative to the tooth is suppressed, wherein:

[0267] The electrical insulator assembly has:

[0268] an inner wall surface forming the tooth insertion hole; and

[0269] a plurality of protrusions protruding from the inner wall toward the inner side of the tooth insertion hole,

[0270] The inner wall surface has a first inner wall surface, a second inner wall surface, a third inner wall surface, and a fourth inner wall surface, which are respectively opposite to the first outer wall surface, the second outer wall surface, the third outer wall surface, and the fourth outer wall surface of the tooth when the tooth is inserted into the tooth insertion hole.

[0271] The plurality of protrusions include at least one group of protrusions 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,

[0272] The electrical insulator assembly is configured such that movement of the electrical insulator assembly relative to the tooth is suppressed by the first to fourth outer wall surfaces of the tooth abutting against the at least one set of protrusions.

[0273] (Technical Solution 2) An electrical insulator assembly according to Technical Solution 1, wherein:

[0274] The at least one first protrusion and the at least one second protrusion extend in a radial direction or an axial direction, and the at least one third protrusion and the at least one fourth protrusion extend in a radial direction or a circumferential direction.

[0275] (Technical Solution 3) An electrical insulator assembly according to Technical Solution 1 or 2, wherein:

[0276] Each of 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 is constituted by one protrusion portion that is continuously formed.

[0277] (Technical Solution 4) An electrical insulator assembly according to Technical Solution 1 or 2, wherein:

[0278] 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 composed of a plurality of protrusion portions that are formed separately.

[0279] (Technical Solution 5) An electrical insulator assembly according to any one of Technical Solutions 1 to 4, wherein:

[0280] The plurality of protrusions include 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.

[0281] (Technical Solution 6) An electrical insulator assembly according to any one of Technical Solutions 1 to 5, wherein:

[0282] The first group of protrusions includes at least two first protrusions separately arranged on the first inner wall surface 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 separately arranged on the second inner wall surface in the axial direction.

[0283] (Technical Solution 7) An electrical insulator assembly according to Technical Solution 6, wherein:

[0284] The at least one second protrusion is arranged between the at least two first protrusions in the axial direction, or the at least one first protrusion is arranged between the at least two second protrusions in the axial direction.

[0285] (Technical Solution 8) An electrical insulator assembly according to Technical Solution 7, wherein:

[0286] The at least one second protrusion is arranged at the center of the second inner wall surface in the axial direction, and the at least two first protrusions are arranged to be equidistant from the at least one second protrusion in the axial direction, or the at least one first protrusion is arranged at the center of the first inner wall surface in the axial direction, and the at least two second protrusions are arranged to be equidistant from the at least one first protrusion in the axial direction.

[0287] (Technical Solution 9) An electrical insulator assembly according to any one of Technical Solutions 1 to 4, wherein:

[0288] 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.

[0289] (Technical Solution 10) An electrical insulator assembly according to Technical Solution 9, wherein:

[0290] The at least two first protrusions and the at least two second protrusions are formed at positions facing each other in the circumferential direction.

[0291] (Technical Solution 11) An electrical insulator assembly according to Technical Solution 10, wherein:

[0292] The at least two first protrusions are arranged at equal distances from the center of the first inner wall surface in the axial direction, and the at least two second protrusions are arranged at equal distances from the center of the second inner wall surface in the axial direction.

[0293] (Technical Solution 12) An electrical insulator assembly according to any one of Technical Solutions 5 to 11, wherein:

[0294] The plurality of protrusions include 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.

[0295] (Technical Solution 13) An electrical insulator assembly according to any one of Technical Solutions 1 to 4, wherein:

[0296] The plurality of protrusions include 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.

[0297] (Technical Solution 14)

[0298] An electrical insulator assembly according to any one of technical solutions 1 to 13, wherein:

[0299] A recessed portion recessed toward the outside of the tooth insertion hole is formed at at least one of the first boundary between the first inner wall surface and the third inner wall surface, the second boundary between the first inner wall surface and the fourth inner wall surface, the third boundary between the second inner wall surface and the third inner wall surface, and the fourth boundary between the second inner wall surface and the fourth inner wall surface.

[0300] (Technical Solution 15) A stator, which is composed of a stator core, a stator winding and a plurality of electrical insulator components,

[0301] The stator core is formed into a cylindrical shape by a plurality of electromagnetic steel sheets stacked in the axial direction, and has a yoke extending in the circumferential direction and a plurality of teeth extending radially inward from the yoke in the radial direction.

[0302] The plurality of electrical insulator assemblies are respectively mounted on the plurality of teeth,

[0303] The stator winding is wound around the electrical insulator components respectively mounted on the plurality of teeth, wherein:

[0304] As the electric insulator assembly, the electric insulator assembly according to any one of claims 1 to 14 is used.

[0305] (Technical Solution 16) A stator according to Technical Solution 15, wherein:

[0306] The stator core is composed of a plurality of core members.

[0307] (Technical Solution 17) A stator according to Technical Solution 16, wherein:

[0308] The stator core is composed of a plurality of core members including a yoke portion extending in the circumferential direction and a tooth portion extending radially inward from the yoke portion in the radial direction.

[0309] (Technical Solution 18) A stator according to Technical Solution 16, wherein:

[0310] The stator core is composed of a first core member having a yoke portion extending in the circumferential direction and a plurality of second core members having tooth portions extending in the radial direction.

[0311] (Technical Solution 19) An electric motor comprising a stator and a rotor, wherein:

[0312] As the stator, the stator described in any one of claims 15 to 18 is used.

[0313] (Technical Solution 20) A compressor comprising a compression mechanism for compressing a working medium and an electric motor for driving the compression mechanism, wherein:

[0314] As the electric motor, the electric motor described in Technical Solution 19 is used.

[0315] The structures of the electric insulator assembly, the stator core, the stator, the motor, and the compressor of the present application are not limited to the structures described in the embodiments, and various changes, additions, and deletions can be made.

[0316] The shape of the electrical insulator assembly can be changed appropriately.

[0317] The protrusion can be composed of a single protrusion portion extending continuously or a plurality of protrusion portions arranged separately.

[0318] The cross-sectional shape of the protrusion is not limited to a quadrilateral shape (for example, a square shape or a rectangular shape), and can be set to various shapes such as a curved shape (including a circular shape).

[0319] The contact area between the outer wall surface and the protrusion can be set appropriately.

[0320] The extension direction of the protrusion 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. In addition, it can be set to a direction parallel to the axial direction (including "approximately parallel") or a direction inclined relative to the axial direction. In addition, it can be set to a direction parallel to the circumferential direction (including "approximately parallel") or a direction inclined relative to the circumferential direction.

[0321] The number of the first to fourth protrusions formed on the first to fourth inner wall surfaces of the electrical insulator assembly, respectively, can be changed appropriately. For example, a technical solution having a first group of protrusions including at least one (or at least two) first protrusions and at least one (or at least two) second protrusions can be used. Alternatively, a technical solution having 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 technical solution having a second group of protrusions including at least one (or at least two) third protrusions and at least one (or at least two) fourth protrusions can be used. Alternatively, a technical solution having 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 technical solution having a first group of protrusions and a second group of protrusions can be used.

[0322] The arrangement positions (positions along the axial direction, positions along the radial direction, positions along the circumferential direction) of the protrusions formed on the first to fourth inner wall surfaces of the electrical insulator assembly can be changed as appropriate.

[0323] The shape, number, and arrangement position of the recesses formed at the boundaries of the first to fourth inner wall surfaces of the electrical insulator assembly are appropriately set so as to reduce the resistance generated by the contact between burrs generated when the tooth insertion holes are formed by punching and the first to fourth inner wall surfaces forming the tooth insertion holes.

[0324] The shape of the stator core can be changed appropriately.

[0325] The stator core can be composed of one core member or a plurality of core members. When composed of a plurality of core members, the shape and number of the core members can be changed as appropriate.

[0326] As the electric motor, electric motors of various structures can be used.

[0327] The compressor can be configured as various types of compressors such as a horizontal compressor and a vertical compressor.

[0328] As the compression mechanism constituting the compressor, compression mechanisms having various structures can be used.

[0329] Each configuration described in the embodiment may be used alone or in combination of a plurality of appropriately selected configurations.

Claims

1. An electrical insulator assembly, comprising a tooth insertion hole for inserting a tooth, the tooth extending in a radial direction and having a first outer wall surface, a second outer wall surface, a third outer wall surface, and a fourth outer wall surface formed on a first circumferential side, a second circumferential side, a first axial side, and a second axial side, the electrical insulator assembly being configured to insert the tooth into the tooth insertion hole in a state where movement relative to the tooth is suppressed, wherein: The electrical insulator assembly has: an inner wall surface forming the tooth insertion hole; and a plurality of protrusions protruding from the inner wall toward the inner side of the tooth insertion hole, The inner wall surface has a first inner wall surface, a second inner wall surface, a third inner wall surface, and a fourth inner wall surface, which are respectively opposite to the first outer wall surface, the second outer wall surface, the third outer wall surface, and the fourth outer wall surface of the tooth when the tooth is inserted into the tooth insertion hole. The plurality of protrusions include at least one group of protrusions 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 is configured such that movement of the electrical insulator assembly relative to the tooth is suppressed by the first to fourth outer wall surfaces of the tooth abutting against the at least one set of protrusions.

2. The electrical insulator assembly according to claim 1, wherein The plurality of protrusions include 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. The electrical insulator assembly according to claim 2, wherein: The first group of protrusions includes at least two first protrusions formed separately on the first inner wall surface 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 separately on the second inner wall surface in the axial direction.

4. The electrical insulator assembly according to claim 3, wherein: The at least one second protrusion is formed between the at least two first protrusions in the axial direction, or the at least one first protrusion is formed between the at least two second protrusions in the axial direction.

5. The electrical insulator assembly according to claim 4, wherein: The at least one second protrusion is formed in the center of the second inner wall surface in the axial direction, and the at least two first protrusions are formed to be equidistant from the at least one second protrusion in the axial direction, or the at least one first protrusion is formed in the center of the first inner wall surface in the axial direction, and the at least two second protrusions are formed to be equidistant from the at least one first protrusion in the axial direction.

6. The electrical insulator assembly according to claim 2, wherein: 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.

7. The electrical insulator assembly according to claim 6, wherein: The at least two first protrusions and the at least two second protrusions are formed at positions facing each other in the circumferential direction.

8. The electrical insulator assembly according to claim 7, wherein: The at least two first protrusions are formed at equal distances from the center of the first inner wall surface in the axial direction, and the at least two second protrusions are formed at equal distances from the center of the second inner wall surface in the axial direction.

9. The electrical insulator assembly of claim 2, wherein: The plurality of protrusions include 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. The electrical insulator assembly of claim 1, wherein: The plurality of protrusions include 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. The electrical insulator assembly of claim 1, wherein: The at least one first protrusion and the at least one second protrusion extend in a radial direction or an axial direction, and the at least one third protrusion and the at least one fourth protrusion extend in a radial direction or a circumferential direction.

12. The electrical insulator assembly of claim 1, wherein: A recessed portion recessed toward the outside of the tooth insertion hole is formed at at least one of the first boundary between the first inner wall surface and the third inner wall surface, the second boundary between the first inner wall surface and the fourth inner wall surface, the third boundary between the second inner wall surface and the third inner wall surface, and the fourth boundary between the second inner wall surface and the fourth inner wall surface.

13. A stator, comprising a stator core, a stator winding and a plurality of electrical insulator components, The stator core is formed into a cylindrical shape by a plurality of electromagnetic steel sheets stacked in the axial direction, and has a yoke extending in the circumferential direction and a plurality of teeth extending radially inward from the yoke in the radial direction. The plurality of electrical insulator assemblies are respectively mounted on the plurality of teeth, The stator winding is wound around the electrical insulator components respectively mounted on the plurality of teeth, wherein: As the electric insulator component, the electric insulator component according to any one of claims 1 to 12 is used.

14. An electric motor comprising a stator and a rotor, wherein: As the stator, the stator according to claim 13 is used.

15. A compressor comprising a compression mechanism for compressing a working medium and an electric motor for driving the compression mechanism, wherein: As the electric motor, the electric motor according to claim 14 is used.

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