stator

Abstract

The insulator cover (20) is assembled to the insulator (20) by a snap-fit ​​structure (40), which has: a cantilever piece (42) extending in the circumferential direction of the stator (10), one end of the extension direction being a fixed end (42A) and the other end of the extension direction being a free end (42B); a locking part (44) formed on the free end side of the cantilever piece; and a locked part (46) formed in the insulator for locking the locking part from the other side of the stator axially.

Description

[0001] Mutual citation of related applications

[0002] This application claims the benefit of priority based on Japanese Patent Application No. 2023-191116, filed on November 8, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to the stator of a rotating electrical machine. Background Technology

[0004] As a stator for a rotating electrical machine, the following stators are known, for example. For instance, Japanese Patent Application Publication No. 2010-045951 discloses a stator (stator 1) comprising: a plurality of teeth (teeth 4); an insulator (insulating member 7) mounted on the plurality of teeth; a winding (winding 6) wound around the plurality of teeth via the insulator; and an insulating cover (insulating cover 9) covering the winding from one axial side of the stator. The insulating cover is assembled to the insulator by a snap-fit ​​structure. The snap-fit ​​structure has: a cantilever plate (outer diameter wall 9a) extending in the axial direction of the stator, one end of the extending direction being a fixed end and the other end of the extending direction being a free end; a locking part (locking part 9d) formed at the free end of the cantilever plate; and a locked part (locking part of the outer peripheral sidewall 7a) formed in the insulator for locking the locking part from the other axial side of the stator. Summary of the Invention

[0005] After detailed research, the inventors discovered the following problem: During the assembly of the insulator cover from the axial side of the stator onto the insulator, the locking part passes over the locked part, causing the cantilever plate to deform. In this structure where the cantilever plate extends along the axial direction of the stator, the short length of the cantilever plate increases the stress acting on its fixed end, potentially causing damage to the fixed end.

[0006] The purpose of this disclosure is to provide a stator capable of suppressing damage to the fixed end of the cantilever plate.

[0007] One aspect of this disclosure is a stator of a rotary electric machine, the stator comprising: a stator core having a plurality of teeth; an insulator mounted on the plurality of teeth; a winding having a plurality of winding portions wound around the plurality of teeth via the insulator; and an insulator cover covering the plurality of winding portions from one axial side of the stator, the insulator cover being assembled to the insulator by a snap-fit ​​structure having: a cantilever plate extending in the circumferential direction of the stator, one end of the extending direction being a fixed end and the other end of the extending direction being a free end; a locking portion formed on the free end side of the cantilever plate; and a locked portion formed in the insulator for locking the locking portion from the other axial side of the stator. Attached Figure Description

[0008] Figure 1 This is a side view of the stator according to one embodiment of the present disclosure.

[0009] Figure 2 This is an exploded 3D diagram of the stator.

[0010] Figure 3 This is a top view of the stator body.

[0011] Figure 4 This is a top view of the insulating cover.

[0012] Figure 5 This is a longitudinal sectional view of the stator.

[0013] Figure 6 It is an exploded three-dimensional view containing an enlarged view of the main part of the stator.

[0014] Figure 7 This is a top view of the core components.

[0015] Figure 8 This is a schematic top view of the stator of the first modified example.

[0016] Figure 9 This is an explanatory diagram showing the stator of the second modified example in comparison.

[0017] Figure 10 This is a schematic top view of the stator of the third modified example.

[0018] Figure 11 This is an explanatory diagram showing the stator of the fourth modified example in comparison.

[0019] Figure 12 This is a top view showing the insulating cover of the fifth modified example.

[0020] Figure 13 This is a perspective view of the insulator showing the fifth modified example.

[0021] Figure 14 This is an exploded perspective view of the stator in the sixth modified example.

[0022] Figure 15 This is a schematic longitudinal sectional view showing the main part of the stator of the sixth modified example.

[0023] Figure 16 This is an exploded perspective view of the stator in the seventh modified example.

[0024] Figure 17 This is a top view of the stator body of the seventh variant.

[0025] Figure 18 This is a three-dimensional view of the stator in the eighth modified example. Detailed Implementation

[0026] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0027] Figure 1 A stator 10 according to one embodiment of this disclosure is shown. The stator 10 is a so-called split-core type stator. The basic structure of the split-core type stator is described in Patent No. 5502115. The stator 10 is an example of a rotary motor and is suitable for an internal rotor type brushless motor. That is, a rotor (not shown) is rotatably housed inside the stator 10, and the stator 10 and the rotor constitute a brushless motor.

[0028] In addition, in each figure, arrow A1 indicates one side of the axial direction of stator 10, and arrow A2 indicates the other side of the axial direction of stator 10.

[0029] like Figure 1 and Figure 2 As shown, the stator 10 includes a stator body 14 and an insulator cover 16. (As indicated...) Figure 3 As shown, the stator body 14 includes a stator core 18, an insulator 20, and a winding 22.

[0030] The stator core 18 is composed of a plurality of core constituent members 24 divided circumferentially along the stator core 18. Each core constituent member 24 has a yoke constituent portion 26 and a tooth portion 28. The yoke constituent portion 26 is the part that constitutes the yoke 30, which is the part on the outer peripheral side of the stator core 18. The tooth portion 28 extends from the yoke constituent portion 26 toward the radially inward side of the stator core 18.

[0031] The insulator 20 has a plurality of insulating portions 32. Each insulating portion 32 is mounted on the tooth portion 28, covering the side surface of the tooth portion 28 and the inner surface of the yoke component 26. The winding 22 has a plurality of winding portions 34 wound around the plurality of teeth 28 via the insulator 20 (more specifically, each insulating portion 32). As an example, each winding portion 34 is wound around each tooth 28 by a concentrated winding method.

[0032] like Figure 2 As shown, the insulator cover 16 is assembled to the stator body 14 from one axial side of the stator 10. The insulator cover 16 is configured such that, when assembled to the stator body 14, it covers a plurality of winding portions 34 from one axial side of the stator 10. The insulator cover 16 has a top wall portion 36 and a peripheral wall portion 38. The peripheral wall portion 38 is formed around the top wall portion 36 and extends from the top wall portion 36 toward the other axial side of the stator 10.

[0033] like Figure 4 and Figure 5 As shown, the insulator cover 16 is assembled to the insulator 20 by a plurality of snap-fit ​​structures 40. The plurality of snap-fit ​​structures 40 are disposed on the outer periphery of the stator 10. The number of the plurality of snap-fit ​​structures 40 is set to be a multiple of an approximation of the number of the plurality of teeth 28. In this embodiment, as an example, the number of the plurality of teeth 28 (in other words, the number of slots between the plurality of teeth 28) is twelve, and the number of the plurality of snap-fit ​​structures 40 is set to three. Each snap-fit ​​structure 40 has a cantilever piece 42, a locking portion 44, and a locked portion 46.

[0034] The cantilever plate 42 extends in the circumferential direction (arrow R direction) of the stator 10. The cantilever plate 42 is formed from a portion of the peripheral wall portion 38 of the insulator cover 16. The cantilever plate 42 is separated from the top wall portion 36 along its entire length in the extending direction. One end of the cantilever plate 42 in the extending direction is a fixed end 42A, and the other end is a free end 42B. The cantilever plate 42 is formed in an arc shape along the circumferential direction of the stator 10.

[0035] The locking portion 44 is formed on the free end 42B side of the cantilever plate 42. More specifically, the locking portion 44 is formed on the end of the free end 42B side of the cantilever plate 42, near the axial side of the stator 10 (see reference). Figure 5 The locking part 44 is formed as a protrusion (in other words, a hook shape) that protrudes radially inward from the free end 42B of the cantilever plate 42 toward the stator 10.

[0036] A locking portion 46 is formed on the insulator 20. The locking portion 46 is formed as a protrusion that extends radially outward from the insulator 20 toward the stator 10. The locking portion 44 is locked to the locking portion 46 from the other side of the axial direction of the stator 10, thereby preventing the insulator cover 16 from detaching relative to the insulator 20.

[0037] If the length of the cantilever plate 42 along the circumference of the stator 10 is set as L [mm], the displacement of the cantilever plate 42 when the locking part 44 passes over the locked part 46 during the process of assembling the insulator cover 16 from the axial side of the stator 10 to the insulator 20 is set as δ [mm], the Young's modulus of the cantilever plate 42 is set as E [MPa], the plate thickness of the cantilever plate 42 is set as t [mm], and the stress acting on the fixed end 42A of the cantilever plate 42 is set as σ [Pa], then σ is calculated by equation (1).

[0038] σ=δEt / L 2 …(1)

[0039] In this embodiment, the cantilever piece 42 of the snap-fit ​​structure 40 extends in the circumferential direction of the stator 10. Therefore, for example, compared to the case where the cantilever piece 42 extends in the axial direction of the stator 10, the length of the cantilever piece 42 can be increased. As a result, during the process of assembling the insulator cover 16 from the axial side of the stator 10 to the insulator 20, even if the cantilever piece 42 deforms due to the locking portion 44 passing over the locked portion 46, the stress acting on the fixed end 42A of the cantilever piece 42 can be reduced.

[0040] The plurality of snap-fit ​​structures 40 include: a first snap-fit ​​structure 40A having a cantilever piece 42 with its fixed end 42A located on one circumferential side of the stator 10 relative to its free end 42B; and a second snap-fit ​​structure 40B having a cantilever piece 42 with its fixed end 42A located on the other circumferential side of the stator 10 relative to its free end 42B. In this embodiment, as an example, the plurality of snap-fit ​​structures 40 includes two first snap-fit ​​structures 40A and one second snap-fit ​​structure 40B. Each first snap-fit ​​structure 40A has the same structure, and the first snap-fit ​​structures 40A and the second snap-fit ​​structures 40B have the same structure except for their orientation. A plurality of locking portions 44 are provided at equal intervals along the circumference of the stator 10.

[0041] like Figure 6 and Figure 7 As shown, the insulator cover 16 has an engaging portion 48, and the stator core 18 has a engaged portion 50. The engaging portion 48 is formed on the outer periphery of the insulator cover 16, and the engaged portion 50 is formed on the outer periphery of the stator core 18.

[0042] The engaging portion 48 is formed by a protrusion that extends from the insulator cover 16 toward the axial side of the stator 10. As an example, the engaging portion 48 is formed in a quadrangular prism shape, but it can also be formed in a cylindrical or wedge shape. A groove 52 is formed on the outer periphery of the stator core 18, opening radially outward toward the stator 10 and extending axially along the stator 10. The engaged portion 50 is formed by an opening at the end of the groove 52. The opening faces the axial side of the stator 10. When the insulator cover 16 is assembled to the insulator 20 via multiple snap-fit ​​structures 40, the engaging portion 48 engages with the engaged portion 50, thereby positioning the insulator cover 16 relative to the insulator 20 in the circumferential direction of the stator 10.

[0043] Next, the effects of this embodiment will be explained.

[0044] As detailed above, in the stator 10 of this embodiment, the cantilever piece 42 of the snap-fit ​​structure 40 extends in the circumferential direction of the stator 10. Therefore, for example, compared to the case where the cantilever piece 42 extends in the axial direction of the stator 10, the length of the cantilever piece 42 can be increased. As a result, during the process of assembling the insulator cover 16 from the axial side of the stator 10 to the insulator 20, even if the cantilever piece 42 deforms due to the locking portion 44 passing over the locked portion 46, the stress acting on the fixed end 42A of the cantilever piece 42 can be reduced, thus suppressing damage to the fixed end 42A of the cantilever piece 42.

[0045] That is, the stress acting on the fixed end 42A of the cantilever piece 42 is inversely proportional to the square of the length of the cantilever piece 42. Therefore, by extending the length of the cantilever piece 42 along the circumference of the stator 10, the stress acting on the fixed end 42A of the cantilever piece 42 can be reduced, thereby suppressing the breakage of the fixed end 42A of the cantilever piece 42.

[0046] Furthermore, for example, when the cantilever plate 42 extends along the axial direction of the stator 10, if the insulator cover 16 shifts axially relative to the insulator 20, resulting in an increase in the deformation of the cantilever plate 42, the stress acting on the fixed end 42A of the cantilever plate 42 increases, thus requiring a certain positioning accuracy for the insulator cover 16. However, as in this embodiment, when the cantilever plate 42 extends along the circumferential direction of the stator 10, even if the insulator cover 16 shifts axially relative to the insulator 20, resulting in an increase in the deformation of the cantilever plate 42, the increase in stress acting on the fixed end 42A of the cantilever plate 42 can be suppressed, thus avoiding the requirement for positioning accuracy of the insulator cover 16.

[0047] Furthermore, the cantilever plate 42 is formed as an arc along the circumference of the stator 10. Thus, for example, compared to the case where the cantilever plate 42 is formed as a straight line along the tangential direction of the stator 10, the length of the cantilever plate 42 can be extended, thereby reducing the stress acting on the fixed end 42A of the cantilever plate 42.

[0048] Furthermore, the stator 10 includes a plurality of snap-fit ​​structures 40, the number of which is a multiple of an approximate number of the plurality of teeth 28. This prevents the locked portion 46 from being located in the groove between the teeth 28, and allows the locked portion 46 to be formed in the portion of the insulator 20 corresponding to the teeth 28 (i.e., the insulating portion 32).

[0049] Furthermore, multiple locking portions 44 are arranged at equal intervals along the circumference of the stator 10. This ensures that the stress acting on each locking portion 44 is equal. Consequently, stress concentration at any single locking portion 44 can be prevented.

[0050] Furthermore, the insulator cover 16 has a engaging portion 48 that is a protrusion extending axially toward the stator 10, and the stator core 18 has a engaged portion 50 that engages with the engaging portion 48. Therefore, when the insulator cover 16 is assembled onto the insulator 20 using the multiple snap-fit ​​structures 40, the engaging portion 48 engages with the engaged portion 50, thereby positioning the insulator cover 16 relative to the insulator 20 in the circumferential direction of the stator 10. This ensures good workability when assembling the insulator cover 16 onto the insulator 20 using the multiple snap-fit ​​structures 40.

[0051] Furthermore, the snap-fit ​​structure 40 is provided on the outer periphery of the stator 10. Thus, for example, compared to the case where the snap-fit ​​structure 40 is provided on the inner periphery of the stator 10, the length of the cantilever piece 42 can be extended, thereby reducing the stress acting on the fixed end 42A of the cantilever piece 42.

[0052] Next, variations of this embodiment will be described.

[0053] (First variation)

[0054] In the above embodiment, the plurality of snap-fit ​​structures 40 include: a first snap-fit ​​structure 40A, which has a cantilever piece 42 with its fixed end 42A located on one circumferential side of the stator 10 relative to its free end 42B; and a second snap-fit ​​structure 40B, which has a cantilever piece 42 with its fixed end 42A located on the other circumferential side of the stator 10 relative to its free end 42B. However, it may also be as follows: Figure 8 As shown, each of the multiple snap-fit ​​structures 40 has a cantilever piece 42 with its fixed end 42A located on the circumferential side of the stator 10 relative to its free end 42B.

[0055] (Second variation)

[0056] Furthermore, in the above embodiment, as an example, the number of multiple snap-fit ​​structures 40 is three, but it can be any multiple of an approximate number of the number of multiple teeth 28, or even more than three. For example, in Figure 9 (A) shows an example where the number of multiple snap-fit ​​structures 40 is two and the two snap-fit ​​structures 40 are arranged at 180° intervals. Figure 9 (B) shows an example where the number of multiple snap-fit ​​structures 40 is four and the four snap-fit ​​structures 40 are arranged at 90° intervals. Figure 9 Example (C) shows an example where the number of multiple snap-fit ​​structures 40 is six and the six snap-fit ​​structures 40 are arranged at 60° intervals. Figure 9 (D) shows an example in which the number of multiple snap-fit ​​structures 40 is twelve and the twelve snap-fit ​​structures 40 are arranged at 30° intervals.

[0057] Furthermore, in the above embodiment, the number of teeth 28 is twelve, but the number of teeth 28 may also be more than twelve. For example, the number of teeth 28 may be six or eighteen. Additionally, when the number of teeth 28 is six, the number of snap-fit ​​structures 40 may be two, three, or six; when the number of teeth 28 is twelve, the number of snap-fit ​​structures 40 may be two, three, four, six, or twelve; and when the number of teeth 28 is eighteen, the number of snap-fit ​​structures 40 may be two, three, six, nine, or eighteen. Furthermore, when the number of teeth 28 is fifteen, the number of snap-fit ​​structures 40 may be three, five, or fifteen.

[0058] (Third variation)

[0059] Furthermore, in the above embodiment, the plurality of locking portions 44 are arranged at equal intervals along the circumference of the stator 10. However, it is also possible to... Figure 10 As shown, multiple locking parts 44 (in other words, multiple cantilever plates 42 with the same orientation) are arranged at unequal intervals along the circumference of the stator 10.

[0060] Furthermore, in the above embodiment, each of the three teeth 28 is assigned a snap-fit ​​structure 40, but the number of snap-fit ​​structures 40 assigned to a single tooth 28 can be arbitrary. Additionally, the multiple snap-fit ​​structures 40 assigned to a single tooth 28 can be arranged either circumferentially along the stator 10 or axially along the stator 10.

[0061] (Fourth variation)

[0062] Furthermore, in the above embodiment, each snap-fit ​​structure 40 is provided on the outer periphery of the stator 10. For example, in Figure 11 (A) shows an example where each snap-fit ​​structure 40 has a cantilever piece 42 with its fixed end 42A located on one circumferential side of the stator 10 relative to its free end 42B, and is disposed on the outer periphery of the stator 10. In contrast, it can also be as follows: Figure 11 As shown in (B), each snap-fit ​​structure 40 is provided on the inner periphery of the stator 10. Even though each snap-fit ​​structure 40 is provided on the inner periphery of the stator 10, for example, the length of the cantilever piece 42 can still be extended compared to the case where the cantilever piece 42 extends in the axial direction of the stator 10.

[0063] (Fifth variation)

[0064] Furthermore, in the above embodiment, the insulator cover 16 has a engaging portion 48 that is a protrusion extending axially toward the stator 10, and the stator core 18 has a engaged portion 50 that is an opening extending axially toward the stator 10. However, it is also possible to... Figure 12 As shown, the insulator cover 16 has a locking portion 90 that serves as an axial opening to the stator 10. As an example, the locking portion 90 is formed on the inner periphery (the portion on the inner periphery side) of the insulator cover 16.

[0065] Alternatively, it can be like Figure 13 As shown, the insulator 20 has a locking portion 92 that is a protrusion projecting axially toward the stator 10. The insulator 20 has a connecting portion 94 that connects the inner peripheral portions of a plurality of insulating portions 32, and the locking portion 92 is formed in the connecting portion 94. Moreover, the insulator cover 16 can be positioned relative to the insulator 20 in the circumferential direction of the stator 10 by engaging the locking portion 90 with the locking portion 92. Even with this configuration, it is possible to ensure good workability when assembling the insulator cover 16 onto the insulator 20 using the multiple snap-fit ​​structures 40.

[0066] In addition, Figure 12 and Figure 13 In the example shown, the engaging portion 90 formed on the insulator cover 16 can be a protrusion extending axially toward the stator 10, and the engaging portion 92 formed on the stator core 18 can be an opening extending axially toward the stator 10. Furthermore, in the above embodiment, the engaging portion 48 formed on the insulator cover 16 can be an opening extending axially toward the stator 10, and the engaging portion 50 formed on the stator core 18 can be a protrusion extending axially toward the stator 10.

[0067] (Sixth variation)

[0068] Alternatively, it can be like Figure 14 and Figure 15As shown, the cantilever plate 42 has a engaging portion 96 that serves as an opening radially towards the stator 10, and the insulator 20 has a engaged portion 98 that serves as a protrusion radially towards the stator 10. Furthermore, the insulator cover 16 can be positioned relative to the insulator 20 in the circumferential direction of the stator 10 by engaging the engaging portion 96 with the engaged portion 98. Even with this configuration, good workability is achieved when assembling the insulator cover 16 onto the insulator 20 using multiple snap-fit ​​structures 40.

[0069] In addition, the engaging portion 96 may be a protrusion that protrudes radially toward the stator 10, and the engaged portion 98 may be an opening that opens radially toward the stator 10.

[0070] (Seventh variation)

[0071] Alternatively, it can be like Figure 16 and Figure 17 As shown, the insulator cover 16 has multiple insulating walls 100 inserted between the multiple winding portions 34. The number of insulating walls 100 is the same as the number of teeth 28 (in other words, the number of slots between the teeth 28). Each insulating portion 32 abuts against the lower end of the winding portion 34 (i.e., the end of the winding portion 34 opposite to the insulator cover 16). Thus, when the insulator cover 16 has multiple insulating walls 100, the insulation of adjacent winding portions 34 can be improved. In addition, since it is not necessary to provide insulating paper between adjacent winding portions 34, the number of assembly steps for the stator 10 can be reduced.

[0072] (Eighth variation)

[0073] Furthermore, in the above embodiment, when the insulator cover 16 is assembled onto the insulator 20 using multiple snap-fit ​​structures 40, the engaging portion 48 engages with the engaged portion 50, thereby positioning the insulator cover 16 relative to the insulator 20 in the circumferential direction of the stator 10. However, it is also possible to... Figure 18 As shown, a rod-shaped clamp 104 is inserted into the V-shaped recess 102 provided in the insulator cover 16 and the groove 52 formed in the stator core 18, thereby positioning the insulator cover 16 relative to the insulator 20 in the circumferential direction of the stator 10.

[0074] In addition, the variations that can be combined among the above-mentioned variations can be appropriately combined.

[0075] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above. Of course, various modifications and implementations can be made without departing from its spirit.

[0076] Regarding this disclosure, the following notes are made.

[0077] (Note 1)

[0078] A stator, specifically a stator (10) of a rotating electric motor, comprising: Stator core (18) having multiple teeth (28); An insulator (20) is mounted on the plurality of teeth; The winding (22) has a plurality of winding portions (34) wound around the plurality of teeth via the insulator; and An insulating cover (16) covers the plurality of winding portions from one axial side of the stator. The insulating cover is assembled to the insulator via a snap-fit ​​structure (40). The snap-fit ​​structure has the following characteristics: The cantilever plate (42) extends in the circumferential direction of the stator, with one end of the extension direction being a fixed end (42A) and the other end of the extension direction being a free end (42B). The locking portion (44), which is formed on the free end side of the cantilever plate; and A locking part (46) is formed in the insulator for locking the locking part from the other side of the stator axially.

[0079] (Note 2)

[0080] According to the stator described in Appendix 1 The cantilever plate is formed in an arc shape along the circumference of the stator.

[0081] (Note 3)

[0082] According to the stator described in Appendix 1 or Appendix 2, Includes multiple of the aforementioned snap-fit ​​structures, The number of the plurality of said snap-fit ​​structures is an approximate multiple of the number of the plurality of said teeth.

[0083] (Note 4)

[0084] According to any one of Appendix 1 to Appendix 3, the stator Includes multiple of the aforementioned snap-fit ​​structures, Multiple locking parts are arranged at equal intervals along the circumference of the stator.

[0085] (Note 5)

[0086] According to any one of Annexes 1 to 4, the stator The insulating cover has a locking portion (48) that serves as an opening that opens axially toward the stator or a protrusion that protrudes axially toward the stator. The stator core has a engaged portion (50) that engages with the engaged portion.

[0087] (Note 6)

[0088] According to any one of Annexes 1 to 4, the stator The insulating cover has a locking portion (90) that serves as an opening to the axial direction of the stator or a protrusion to the axial direction of the stator. The insulator has a engaged portion (92) that engages with the engaged portion.

[0089] (Note 7)

[0090] According to any one of Annexes 1 to 4, the stator The cantilever plate has an engaging portion (96) that serves as an opening to the stator in the radial direction or a protrusion to the radial direction. The insulator has a engaged portion (98) that engages with the engaged portion.

[0091] (Note 8)

[0092] According to any one of Appendix 1 to Appendix 7, the stator The snap-fit ​​structure is located on the outer periphery of the stator.

[0093] (Note 9)

[0094] According to any one of Appendix 1 to Appendix 7, the stator The snap-fit ​​structure is located on the inner periphery of the stator.

[0095] (Postscript 10)

[0096] According to any one of Appendix 1 to Appendix 9, the stator The insulating cover has an insulating wall (100) inserted between the plurality of winding portions.

Claims

1. A stator, specifically a stator (10) of a rotating electric motor, comprising: Stator core (18) having multiple teeth (28); An insulator (20) is mounted on the plurality of teeth; The winding (22) has a plurality of winding portions (34) wound around the plurality of teeth via the insulator; and An insulating cover (16) covers the plurality of winding portions from one axial side of the stator. The insulating cover is assembled to the insulator via a snap-fit ​​structure (40). The snap-fit ​​structure has the following characteristics: The cantilever plate (42) extends in the circumferential direction of the stator, with one end of the extension direction being a fixed end (42A) and the other end of the extension direction being a free end (42B). The locking part (44) is formed on the free end side of the cantilever plate; as well as A locking part (46) is formed in the insulator for locking the locking part from the other side of the stator axially.

2. The stator according to claim 1, characterized in that, The cantilever plate is formed in an arc shape along the circumference of the stator.

3. The stator according to claim 1 or 2, characterized in that, Includes multiple of the aforementioned snap-fit ​​structures, The number of the plurality of said snap-fit ​​structures is an approximate multiple of the number of the plurality of said teeth.

4. The stator according to any one of claims 1 to 3, characterized in that, Includes multiple of the aforementioned snap-fit ​​structures, Multiple locking parts are arranged at equal intervals along the circumference of the stator.

5. The stator according to any one of claims 1 to 4, characterized in that, The insulating cover has a locking portion (48) that serves as an opening that opens axially toward the stator or a protrusion that protrudes axially toward the stator. The stator core has a engaged portion (50) that engages with the engaged portion.

6. The stator according to any one of claims 1 to 4, characterized in that, The insulating cover has a locking portion (90) that serves as an opening to the axial direction of the stator or a protrusion to the axial direction of the stator. The insulator has a engaged portion (92) that engages with the engaged portion.

7. The stator according to any one of claims 1 to 4, characterized in that, The cantilever plate has an engaging portion (96) that serves as an opening to the stator in a radial direction or a protrusion to the radial direction. The insulator has a engaged portion (98) that engages with the engaged portion.

8. The stator according to any one of claims 1 to 7, characterized in that, The snap-fit ​​structure is located on the outer periphery of the stator.

9. The stator according to any one of claims 1 to 7, characterized in that, The snap-fit ​​structure is located on the inner periphery of the stator.

10. The stator according to any one of claims 1 to 9, characterized in that, The insulating cover has an insulating wall (100) inserted between the plurality of winding portions.

Images