Stator

Abstract

To provide a stator capable of reducing stray capacitance.SOLUTION: A stator (10) comprises: a stator core (24) having a plurality of radially extending tooth parts (20); a resin insulator (16) fitted to the stator core; and a coil winding part (18) wound around the plurality of tooth parts via the insulator. The insulator has fitting parts (30, 32) fitted to fitting surfaces (20A, 22A) of the stator core. The fitting parts are provided with grooves (34, 36) opened to the fitting surface sides. Gas layers (38, 40) are formed, by the grooves, between the stator core and the coil winding part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a stator. [Background technology]

[0002] Conventionally, there is a stator that includes a stator core having a plurality of radially extending teeth, an insulating film attached to the stator core, and a winding portion wound around the plurality of teeth with the insulating film interposed therebetween (see, for example, Patent Document 1). This stator is said to be able to improve assembly ease and insulation reliability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-198515 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, the use of an insulating film shortens the distance between the teeth and the windings, making it impossible to reduce stray capacitance, which is a capacitance component generated by the potential difference between the stator core and the windings.

[0005] The technology of the present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a stator that can reduce stray capacitance. [Means for solving the problem]

[0006] In order to solve the above problem, the stator (10) according to the technology of the present disclosure comprises a stator core (24) having a plurality of radially extending tooth portions (20), a resin insulator (16) attached to the stator core, and a winding winding portion (18) wound around the plurality of tooth portions via the insulator, the insulator having an attachment portion (30, 32) attached to an attachment surface (20A, 22A) of the stator core, the attachment portion having a groove (34, 36) opening toward the attachment surface, and a gas layer (38, 40) formed by the groove between the stator core and the winding winding portion.

[0007] According to the stator according to the technique of the present disclosure, stray capacitance can be reduced. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view of a stator according to an embodiment of the technology of the present disclosure. [Figure 2] FIG. 2 is a plan view of a stator component. [Figure 3] FIG. 3 is an enlarged view of part A in FIG. 2. [Figure 4] FIG. 3 is a further enlarged view of part A in FIG. 2. [Figure 5] FIG. [Figure 6] FIG. 2 is a perspective view of a first insulator. [Figure 7] FIG. 2 is a two-sided view of the first insulator. [Figure 8] FIG. 10 is an explanatory diagram illustrating stray capacitance. [Figure 9] FIG. 10 is an enlarged view showing a main part of a stator component according to a first modified example. [Figure 10] FIG. 10 is a vertical cross-sectional view of a first insulator according to a first modified example. [Figure 11] FIG. 10 is an enlarged view of a main part of a stator component according to a second modified example. [Figure 12] FIG. 11 is an enlarged view showing a main part of a stator component according to a third modified example. [Figure 13] FIG. 10 is a perspective view of a stator component according to a fourth modified example. [Figure 14] FIG. 11 is a perspective view of a stator component according to a fifth modified example. [Figure 15] FIG. 13 is a perspective view of a first insulator according to a sixth modified example. [Figure 16] FIG. 13 is a plan view of a first insulator according to a sixth modified example. [Figure 17] FIG. 13 is a perspective view of a first insulator according to a seventh modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the technology of the present disclosure will be described with reference to the drawings.

[0010] As shown in FIG. 1, a stator 10 according to this embodiment includes a plurality of stator components 12. The stator 10 is configured by combining a plurality of stator components 12 in an annular shape. FIG. 1 shows the configuration of half of the stator 10. The stator 10 is applied to a brushless motor. Brushless motors may be used for any purpose. Examples of brushless motors include fan motors, pump drive motors, and compressor motors.

[0011] In each drawing, the X direction indicates the tangential direction of the stator 10, the Y direction indicates the radial direction of the stator 10, and the Z direction indicates the axial direction of the stator 10. In the following description, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential direction, radial direction, axial direction, and circumferential direction of the stator core 24, which will be described later, are the same directions as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.

[0012] As shown in Fig. 2, each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The core member 14 has teeth portions 20 and a core back portion 22. The core back portion 22 extends in the circumferential direction of the stator core 24 (see Fig. 1), and the teeth portions 20 extend inward in the Y direction from the center of the core back portion 22. The tip portions of the teeth portions 20 are free ends, and the base ends of the teeth portions 20 are connected to the core back portion 22.

[0013] A stator core 24 (see FIG. 1) is formed by combining multiple core members 14 in an annular shape. When the stator core 24 is formed, the multiple core back portions 22 form an annular portion 26 (see FIG. 1) that is the outer periphery of the stator core 24, and the multiple tooth portions 20 extend radially from the center of the stator core 24. Slots 28 are formed between the multiple tooth portions 20.

[0014] Note that the configuration of each stator component 12, including its details, is not strictly symmetrical in the X direction when viewed from the Z direction. However, for the sake of convenience, the following description will assume that the main configuration of each stator component 12 is symmetrical in the X direction when viewed from the Z direction, and will focus on the configuration of one side of each stator component 12.

[0015] As shown in Fig. 3, the tooth portion 20 has a side surface 20A, and the core back portion 22 has an inner surface 22A. The side surface 20A extends in the Y direction and the Z direction and faces the X direction. The inner surface 22A extends in the X direction and the Z direction and faces inward in the Y direction. The side surface 20A and the inner surface 22A are in contact with the slot 28.

[0016] The insulator 16 is attached to the core member 14. The insulator 16 is made of resin. Examples of resins that can be used to form the insulator 16 include polyimide, polyamide, polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT). Any resin can be used to form the insulator 16. The insulator 16 has a side wall portion 30 and an inner wall portion 32. The side wall portion 30 is attached to the side surface 20A and covers the side surface 20A. The inner wall portion 32 is attached to the inner surface 22A and covers the inner surface 22A. The side wall portion 30 and the inner wall portion 32 are arranged in a slot 28.

[0017] The side surface 20A and the inner surface 22A are an example of a "mounting surface" according to the present disclosure. The side wall portion 30 and the inner wall portion 32 are an example of a "mounting portion" according to the present disclosure. The side wall portion 30 is an example of a "first mounting portion" according to the present disclosure, and the inner wall portion 32 is an example of a "second mounting portion" according to the present disclosure.

[0018] The winding winding portion 18 is wound around the tooth portion 20 via the insulator 16. The winding winding portion 18 is formed by winding a wire around the tooth portion 20 in the Y direction. A single winding forming the winding winding portion 18 may be wound around only one tooth portion 20 to form only one winding winding portion 18, or may be wound around multiple teeth portions 20 to form several winding winding portions 18.

[0019] The side wall portion 30 has an opposing surface 30A opposing the side surface 20A, and the inner wall portion 32 has an opposing surface 32A opposing the inner surface 22A. A first groove 34 is formed in the opposing surface 30A of the side wall portion 30, and a second groove 36 is formed in the opposing surface 32A of the inner wall portion 32. The first groove 34 opens to the side surface 20A, and the second groove 36 opens to the inner surface 22A. As an example, two first grooves 34 are formed in the opposing surface 30A of the side wall portion 30. The two first grooves 34 are aligned in the Y direction. Furthermore, as an example, one second groove 36 is formed in the opposing surface 32A of the inner wall portion 32.

[0020] A first gas layer 38 is formed by the first groove 34 between the tooth portion 20 and the winding winding portion 18 in the X direction, and a second gas layer 40 is formed by the second groove 36 between the core back portion 22 and the winding winding portion 18 in the Y direction. In other words, the first gas layer 38 is formed inside the first groove 34, and the second gas layer 40 is formed inside the second groove 36. The first groove 34 and the second groove 36 are formed to penetrate in the Z direction.

[0021] The first groove 34 and the second groove 36 are an example of a "groove" according to the present disclosure. The first gas layer 38 and the second gas layer 40 are an example of a "gas layer" according to the present disclosure.

[0022] 4, the side wall portion 30 has an abutment portion 42. The abutment portion 42 is formed adjacent to the first groove 34 and abuts against the side surface 20A. Similarly, the inner wall portion 32 has an abutment portion 44. The abutment portion 44 is formed adjacent to the second groove 36 and abuts against the inner surface 22A.

[0023] More specifically, the abutment portion 42 formed on the side wall portion 30 has a first abutment portion 46 formed at one end of the side wall portion 30 in the Y direction, which is the extension direction of the tooth portion 20, a second abutment portion 48 formed at the other end of the side wall portion 30 in the Y direction, and a third abutment portion 50 formed in the center of the side wall portion 30 in the Y direction.

[0024] The winding portions 52 of the first turn of the winding portion 18 located on the side wall 30 side are aligned in the Y direction, which is the extension direction of the tooth 20. The winding portions 52 have extended winding portions 52A located on an extension line L that extends the boundary line between the first groove 34 and the abutment portion 42 in the normal direction to the side surface 20A of the tooth 20. The winding portions 52 are aligned so that the apex 52A1 of the extended winding portion 52A on the side wall 30 side is located on the extension line L. The apex 52A1 of the extended winding portion 52A is a contact point that comes into contact with the side wall 30.

[0025] More specifically, the abutment portion 44 formed on the inner wall portion 32 has a first abutment portion 54 formed at one end of the inner wall portion 32 in the X direction and a second abutment portion 56 formed at the other end of the inner wall portion 32 in the X direction.

[0026] 5, the insulator 16 is composed of a first insulator 58 and a second insulator 60 that are divided in the Z direction. A dividing portion 62 that divides the first insulator 58 and the second insulator 60 in the Z direction is located, for example, in the center of the tooth portion 20 in the Z direction. The first insulator 58 and the second insulator 60 are connected at the dividing portion 62.

[0027] The winding portion 18 has an axial wiring portion 64 wired in the Z direction along the side wall portion 30 of the tooth portion 20 (see Figure 6), a coil end portion 66 wired on one side of the tooth portion 20 in the Z direction, and a coil end portion 68 wired on the other side of the tooth portion 20 in the Z direction.

[0028] 6, the first insulator 58 has a coil end insulating portion 70. The coil end insulating portion 70 connects one end of the pair of side wall portions 30 in the Z direction. The coil end insulating portion 70 is disposed between the tooth portion 20 and the coil end portion 66 (see FIG. 5), and insulates the tooth portion 20 from the coil end portion 66.

[0029] Positioning portions 72 are formed at the connection portions (corners) between the coil end insulating portions 70 and the side wall portion 30. The positioning portions 72 are formed by uneven portions that are repeatedly arranged in the Y direction. The positioning portions 72 position the multiple winding portions 52 (see FIG. 4) of the first turn of the winding winding portion 18, and as described above, the multiple winding portions 52 are aligned so that the apex 52A1 of the extended winding portion 52A on the side wall portion 30 side is located on the extended line L.

[0030] 7, the first groove 34, the second groove 36, the contact portion 42, and the contact portion 44 extend in the Z direction and reach the dividing portion 62. The second insulator 60 has the same configuration as the first insulator 58, and therefore a description thereof will be omitted.

[0031] Next, the operation and effects of this embodiment will be described.

[0032] Here, stray capacitance will be explained with reference to Figure 8. Stray capacitance refers to the capacitance component generated by the potential difference between the winding winding portion 18 and the stator core 24. The stray capacitance is calculated using the following theoretical formula. In the following theoretical formula, the relative permittivity refers to the relative permittivity of the insulator 16, the surface area refers to the surface area of the stator core 24, and the distance refers to the distance between the stator core 24 and the winding winding portion 18. Stray capacitance ∝ relative permittivity × surface area / distance

[0033] There is a risk that stray capacitance will induce noise due to electrostatic induction in the inverter that supplies current to winding portion 18. One possible solution to this problem is to install a noise cut filter in the inverter. However, installing a noise cut filter in the inverter increases costs.

[0034] In this regard, in the present embodiment, a first gas layer 38 is formed by the first groove 34 between the tooth portion 20 and the winding portion 18 in the X direction. Therefore, the first gas layer 38 can lower the relative dielectric constant, thereby reducing the stray capacitance between the tooth portion 20 and the winding portion 18. Furthermore, a second gas layer 40 is formed by the second groove 36 between the core back portion 22 and the winding portion 18 in the Y direction. Therefore, the second gas layer 40 can lower the relative dielectric constant, thereby reducing the stray capacitance between the core back portion 22 and the winding portion 18.

[0035] Furthermore, by forming the first gas layer 38 and the second gas layer 40 between the winding portion 18 and the stator core 24, the stray capacitance between the winding portion 18 and the stator core 24 can be reduced, eliminating the need to install a noise cut filter in the inverter, thereby preventing costs from increasing.

[0036] Furthermore, since a first gas layer 38 is formed between the tooth portion 20 and the winding winding portion 18, and a second gas layer 40 is formed between the core back portion 22 and the winding winding portion 18, the stray capacitance between the stator core 24 and the winding winding portion 18 can be reduced both between the tooth portion 20 and the winding winding portion 18 and between the core back portion 22 and the winding winding portion 18, compared to when only one of the first gas layer 38 and the second gas layer 40 is formed.

[0037] Furthermore, by forming a first gas layer 38 between the tooth portion 20 and the side wall portion 30 by the first groove 34, the thickness of the side wall portion 30 can be made thinner than when the tooth portion 20 and the winding portion 18 are insulated only by the side wall portion 30. Similarly, by forming a second gas layer 40 between the core back portion 22 and the inner wall portion 32 by the second groove 36, the thickness of the inner wall portion 32 can be made thinner than when the core back portion 22 and the winding portion 18 are insulated only by the inner wall portion 32. This allows the cross-sectional area of the slot 28 to be increased, which in turn allows the number of turns of the winding portion 18 to be increased, thereby preventing the stator 10 from becoming larger. In other words, it is possible to prevent the stator 10 from becoming larger in size in order to increase the cross-sectional area of the slot 28.

[0038] Furthermore, the side wall portion 30 has a first abutment portion 46 formed at one end of the side wall portion 30 and a second abutment portion 48 formed at the other end of the side wall portion 30, and the first abutment portion 46 and the second abutment portion 48 abut against the side surface 20A of the tooth portion 20. As a result, the side wall portion 30 is supported by the side surface 20A of the tooth portion 20 at one end and the other end, so that rattle of the insulator 16 relative to the stator core 24 can be suppressed.

[0039] Furthermore, the side wall 30 has a third abutment portion 50 formed in the center of the side wall 30, and the third abutment portion 50 abuts against the side surface 20A of the tooth portion 20. As a result, the side wall 30 is supported at the center by the side surface 20A of the tooth portion 20, so that even when the first groove 34 is formed in the side wall 30, the side wall 30 can be prevented from bending toward the side surface 20A due to the tightening force of the winding winding portion 18.

[0040] Moreover, the first grooves 34 are open not to the winding portion 18 side but to the side of the side wall 30 facing the side of the side wall 30 facing the winding portion 18, so that the winding portion 18 can be supported on the flat surface facing the side wall 30 facing the side of the side wall 30, thereby preventing the winding portion 18 from deforming toward the side of the side wall 30 facing the side of the side wall 30.

[0041] Moreover, the inner wall portion 32 has a first abutment portion 54 formed at one end of the inner wall portion 32 and a second abutment portion 56 formed at the other end of the inner wall portion 32, and the first abutment portion 54 and the second abutment portion 56 abut against the inner surface 22A of the core back portion 22. As a result, the inner wall portion 32 is supported at one end and the other end by the inner surface 22A of the core back portion 22, so that rattle of the insulator 16 relative to the stator core 24 can be suppressed.

[0042] In addition, the multiple winding portions 52 of the first turn located on the side wall portion 30 side of the winding winding portion 18 have extended winding portions 52A located on an extension line L extending the boundary line between the first groove 34 and the abutment portion 42 in the normal direction of the side surface 20A of the tooth portion 20, and the top 52A1 on the side wall portion 30 side of the extended winding portion 52A is located on the extension line L. Therefore, for the top 52A1 of the extended winding portion 52A, which is close to the tooth portion 20, the boundary between the first groove 34 and the abutment portion 42 is assigned as an insulating portion. Therefore, the stray capacitance between the tooth portion 20 and the extended winding portion 52A can be reduced compared to, for example, a configuration in which only the abutment portion 42 is assigned as an insulating portion for the top 52A1 of the extended winding portion 52A, i.e., a configuration in which the entire area between the tooth portion 20 and the top 52A1 of the extended winding portion 52A is a resin portion.

[0043] Next, a modification of this embodiment will be described.

[0044] In the above embodiment, a first gas layer 38 is formed between the tooth portion 20 and the winding winding portion 18, and a second gas layer 40 is formed between the core back portion 22 and the winding winding portion 18, but either the first gas layer 38 or the second gas layer 40 may be omitted.

[0045] In the above embodiment, the insulator 16 is composed of the first insulator 58 and the second insulator 60 separated in the Z direction, but the insulator 16 may be configured such that the first insulator 58 and the second insulator 60 are integrated, i.e., formed in a ring shape around the teeth portion 20. In this case, the teeth portion 20 may be formed in a straight shape in the Y direction (i.e., a cross section having a constant shape in the Y direction) so that the teeth portion 20 can be inserted inside the insulator 16.

[0046] In addition, in the above embodiment, a third abutment portion 50 is formed in the center of the side wall portion 30, and a first groove 34 is formed on both sides of the third abutment portion 50 on the opposing surface 30A of the side wall portion 30, but as shown in Figures 9 and 10, the third abutment portion 50 may be omitted from the center of the side wall portion 30, and only one first groove 34 may be formed on the opposing surface 30A of the side wall portion 30.

[0047] In the above embodiment, the width of the third contact portion 50 along the Y direction is set to be the same as the width (diameter) of one winding portion 52 (see FIG. 4), but as shown in FIG. 11, it may be set to be the same as the width of multiple winding portions 52. In the example shown in FIG. 11, the width of the third contact portion 50 along the Y direction is set to be the same as the width of two winding portions 52.

[0048] In addition, in the above embodiment, the multiple winding portions 52 are aligned so that the apex 52A1 on the side wall portion 30 side of the extended winding portion 52A is positioned on the extension line L, but as shown in Figure 12, the multiple winding portions 52 may all be aligned so that their apex is offset from the extension line L.

[0049] In the above embodiment, the insulator 16 is composed of a first insulator 58 and a second insulator 60 that are divided in the Z direction, and the first insulator 58 and the second insulator 60 are connected at the dividing portion 62. However, as shown in Fig. 13, the first insulator 58 and the second insulator 60 may be separated in the Z direction. Also, as shown in Fig. 14, the first insulator 58 and the second insulator 60 may be configured to be attached to both ends of the core member 14 in the Z direction.

[0050] Furthermore, in the above embodiment, the insulator 16 has a coil end insulating portion 70 disposed between the tooth portion 20 and the coil end portion 66. However, as shown in FIGS. 15 and 16 , the coil end insulating portion 70 may have openings 74 that open in the Z direction. The openings 74 may penetrate in the Z direction, or may be formed in a concave shape that opens only on one side or the other side in the Z direction. There may be any number of openings 74. With this configuration, a gas layer is formed between the tooth portion 20 and the coil end portion 66 by the openings 74, thereby reducing the stray capacitance between the tooth portion 20 and the coil end portion 66.

[0051] In addition, in the above embodiment, a positioning portion 72 is formed at the connection portion between the coil end insulating portion 70 and the side wall portion 30, but as shown in Figure 17, the positioning portion 72 may be omitted from the connection portion (corner portion) between the coil end insulating portion 70 and the side wall portion 30.

[0052] Among the above multiple modified examples, modified examples that can be combined may be combined as appropriate.

[0053] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above, and it goes without saying that various modifications can be made to the present disclosure without departing from the spirit of the present disclosure.

[0054] The following are additional notes regarding this disclosure. (Appendix 1) a stator core (24) having a plurality of radially extending teeth (20); a resin insulator (16) attached to the stator core; a winding portion (18) wound around the plurality of teeth portions via the insulator; Equipped with the insulator has mounting portions (30, 32) mounted on mounting surfaces (20A, 22A) of the stator core, The mounting portion has grooves (34, 36) that open to the mounting surface side, A gas layer (38, 40) is formed between the stator core and the winding portion by the groove. Stator (10). (Appendix 2) The stator core has a core back portion (22) that forms an outer periphery of the stator core, the teeth extend from the core back portion toward a radially inner side of the stator core, The mounting surface has a side surface (20A) of the tooth portion and an inner surface (22A) of the core back portion, the mounting portion has a first mounting portion (30) mounted on a side surface of the tooth portion and a second mounting portion (32) mounted on an inner surface of the core back portion, The grooves include a first groove (34) formed in the first mounting portion and opening to a side surface of the tooth portion, and a second groove (36) formed in the second mounting portion and opening to an inner surface of the core back portion, The gas layer includes a first gas layer (38) formed between the tooth portion and the winding portion, and a second gas layer (40) formed between the core back portion and the winding portion. 2. The stator of claim 1. (Appendix 3) the first mounting portion has an abutment portion (42) formed adjacent to the first groove and abutting against a side surface of the tooth portion, The abutment portion has a first abutment portion (46) formed at one end of the first mounting portion in the extension direction of the tooth portion, and a second abutment portion (48) formed at the other end of the first mounting portion in the extension direction of the tooth portion. 3. The stator according to claim 2. (Appendix 4) The contact portion has a third contact portion (50) formed in the center of the first mounting portion in the extension direction of the teeth portion. 4. The stator of claim 3. (Appendix 5) The plurality of winding portions (52) of the first windings located on the first mounting portion side of the winding winding portion are aligned in the extension direction of the teeth portion, the plurality of winding portions include an extended winding portion (52A) located on an extension line (L) obtained by extending a boundary line between the first groove and the abutment portion in a normal direction to a side surface of the tooth portion, The top portion (52A1) of the extended winding portion on the first mounting portion side is located on the extended line. 5. The stator according to claim 3 or 4. (Appendix 6) The winding portion has a coil end portion (66) that is wired on one axial side of the stator core relative to the tooth portion, The insulator has a coil end insulating portion (70) arranged between the tooth portion and the coil end portion, The coil end insulating portion has an opening (74) that opens in the axial direction of the stator core. 6. The stator according to any one of claims 1 to 5. [Explanation of symbols]

[0055] 10... stator, 12... stator component, 14... core member, 16... insulator, 18... winding winding portion, 20... teeth portion, 20A... side surface, 22... core back portion, 22A... inner surface, 24... stator core, 26... annular portion, 28... slot, 30... side wall portion, 30A... opposing surface, 32... inner wall portion, 32A... opposing surface, 34... first groove, 36... second groove, 38... first gas layer, 40... second gas layer, 42... abutment portion, 44...contact portion, 46...first contact portion, 48...second contact portion, 50...third contact portion, 52...winding portion, 52A...extended winding portion, 52A1...top portion, 54...first contact portion, 56...second contact portion, 58...first insulator, 60...second insulator, 62...split portion, 64...axial wiring portion, 66...coil end portion, 68...coil end portion, 70...coil end insulating portion, 72...positioning portion, 74...opening

Claims

1. a stator core (24) having a plurality of radially extending teeth (20); a resin insulator (16) attached to the stator core; a winding portion (18) wound around the plurality of teeth portions via the insulator; Equipped with The insulator has a mounting portion (30, 32) mounted on a mounting surface (20A, 22A) of the stator core, The mounting portion has grooves (34, 36) formed therein that open to the mounting surface side, A gas layer (38, 40) is formed between the stator core and the winding portion by the groove. Stator (10).

2. The stator core has a core back portion (22) that forms an outer periphery of the stator core, the teeth extend from the core back portion toward a radially inner side of the stator core, The mounting surface has a side surface (20A) of the tooth portion and an inner surface (22A) of the core back portion, The mounting portion has a first mounting portion (30) mounted on a side surface of the tooth portion and a second mounting portion (32) mounted on an inner surface of the core back portion, The grooves include a first groove (34) formed in the first mounting portion and opening to a side surface of the tooth portion, and a second groove (36) formed in the second mounting portion and opening to an inner surface of the core back portion, The gas layer includes a first gas layer (38) formed between the teeth portion and the winding portion, and a second gas layer (40) formed between the core back portion and the winding portion. The stator according to claim 1 .

3. the first mounting portion has an abutment portion (42) formed adjacent to the first groove and abutting against a side surface of the tooth portion, The abutment portion has a first abutment portion (46) formed at one end of the first mounting portion in the extension direction of the tooth portion, and a second abutment portion (48) formed at the other end of the first mounting portion in the extension direction of the tooth portion. The stator according to claim 2 .

4. The abutment portion has a third abutment portion (50) formed in a central portion of the first mounting portion in the extension direction of the teeth portion. The stator according to claim 3 .

5. The plurality of winding portions (52) of the first turns located on the first mounting portion side of the winding winding portion are aligned in the extension direction of the teeth portion, The plurality of winding portions include an extension winding portion (52A) located on an extension line (L) obtained by extending a boundary line between the first groove and the abutment portion in a normal direction to a side surface of the tooth portion, The top portion (52A1) of the extension winding portion on the first mounting portion side is located on the extension line. The stator according to claim 3 .

6. The winding portion has a coil end portion (66) that is wired on one axial side of the stator core relative to the tooth portion, The insulator has a coil end insulating portion (70) arranged between the tooth portion and the coil end portion, The coil end insulating portion has an opening (74) that opens in the axial direction of the stator core. The stator according to claim 1 .

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