stator assembly

Abstract

The stator assembly (1) has a housing (2) formed in a cylindrical shape and a stator (10) housed inside the housing, the stator including a stator core (18) having a plurality of tooth portions (28) and being press-fitted inside the housing, an insulator (20) mounted to the plurality of tooth portions, a winding (22) having a plurality of winding portions (34) wound to the plurality of tooth portions via the insulator, and an insulator cover (16) covering the plurality of winding portions from an axial side of the stator, the insulator cover having a second opposite surface (16A, 36A) opposite to a first opposite surface (2A, 4A) of the housing, a rib (60, 61) being arranged between the first opposite surface and the second opposite surface.

Description

[0001] Mutual citation of related applications

[0002] This application claims the benefit of priority based on Japanese Patent Application No. 2023-191117, filed on November 8, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

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

[0004] As a stator that can be used as a stator assembly for rotating electric machines, there are, for example, the following stator. Specifically, Japanese Patent Application Publication No. 2010-045951 discloses a stator (fixing member 1) that includes: 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. Summary of the Invention

[0005] After detailed research, the inventors discovered the following problem: In rotating electric machines, a stator is housed inside a cylindrical casing, and the casing and stator constitute a stator assembly. The stator is fixed to the casing, for example, by pressing a stator core into the casing. However, when the stator core is pressed into the casing, burrs are generated from the stator core and the casing. These burrs contact the windings and scrape off the winding coating, potentially causing insulation defects in the windings. Therefore, it is necessary to suppress the outflow of burrs generated by the stator core and the casing.

[0006] The purpose of this disclosure is to provide a stator assembly capable of suppressing the outflow of burrs generated by the stator core and the housing when the stator core is pressed into the inside of the housing.

[0007] One aspect of this disclosure is a stator assembly of a rotating electric machine, the stator assembly comprising: a housing formed in a cylindrical shape; and a stator housed inside the housing, the stator comprising: a stator core having a plurality of teeth and pressed into the inside of the housing; 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 having a second opposing surface opposite a first opposing surface of the housing, and ribs disposed between the first opposing surface and the second opposing surface. Attached Figure Description

[0008] Figure 1 This is an exploded perspective view of a stator assembly according to one embodiment of the present disclosure.

[0009] Figure 2 This is a side view of the stator.

[0010] Figure 3 This is an exploded 3D diagram of the stator.

[0011] Figure 4 This is a top view of the stator body.

[0012] Figure 5 This is a top view of the insulating cover.

[0013] Figure 6 This is a longitudinal sectional view of the stator.

[0014] Figure 7 It is an exploded three-dimensional view including an enlarged view of the main parts of the stator.

[0015] Figure 8 This is a top view of the core components.

[0016] Figure 9 It is a magnified 3D view of the main part of the insulating cover.

[0017] Figure 10 This is a schematic side view showing the main part of the insulating cover.

[0018] Figure 11 It is a side view showing an enlarged schematic view of the main parts, including the insulating cover.

[0019] Figure 12 It is a longitudinal sectional view that includes an enlarged view of the main parts of the stator assembly.

[0020] Figure 13 This is a schematic longitudinal sectional view of the stator assembly.

[0021] Figure 14 It is a top view including an enlarged view of the main part of the insulating cover.

[0022] Figure 15 This is a schematic side view illustrating a labyrinthine flow path.

[0023] Figure 16 This is an explanatory diagram showing the stator of the first modified example in comparison.

[0024] Figure 17 This is an explanatory diagram showing the insulating cover of the second modified example in comparison.

[0025] Figure 18 It is a top view of the enlarged main part of the insulating cover including the third variation.

[0026] Figure 19 This is a magnified perspective view of the main part of the insulating cover of the fourth variation.

[0027] Figure 20 This is a perspective view of the insulating cover of the fifth variation.

[0028] Figure 21 This is a perspective view of the insulating cover of the sixth variation.

[0029] Figure 22 This is an explanatory diagram showing the cross-sectional shape of the rib in the seventh modified example.

[0030] Figure 23 This is an enlarged longitudinal sectional view of the main part of the stator assembly in the eighth variant. Detailed Implementation

[0031] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0032] like Figure 1 As shown, the stator assembly 1 of this embodiment includes a housing 2 and a stator 10. The housing 2 is formed into a top cylindrical shape, having a top wall portion 4 and a peripheral wall portion 6. The stator 10 is housed inside the housing 2.

[0033] 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, as an example of a rotary motor, is applicable to 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 the motor section of the brushless motor.

[0034] The stator 10 includes multiple stator components 12 and an insulator cover 16. The stator 10 has U-phase, V-phase, and W-phase, and the number of stator components 12 corresponds to the number of U-phase, V-phase, and W-phase phases. That is, the stator 10 includes stator components 12 for the U-phase, stator components 12 for the V-phase, and stator components 12 for the W-phase. The multiple stator components 12 are assembled together axially from the stator 10 to form a single unit. The stator body 14 is composed of the multiple stator components 12.

[0035] 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.

[0036] like Figure 2 and Figure 3 As shown, the stator 10 includes a stator body 14 and an insulator cover 16. (As indicated...) Figure 4 As shown, the stator body 14 includes a stator core 18, an insulator 20, and a winding 22.

[0037] 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.

[0038] 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.

[0039] like Figure 3 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.

[0040] like Figure 5 and Figure 6 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.

[0041] 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.

[0042] 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 6The 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.

[0043] 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.

[0044] 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).

[0045] σ=δEt / L 2 …(1)

[0046] 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.

[0047] 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.

[0048] like Figure 7 and Figure 8As 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.

[0049] 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 (each core component 24), opening radially outward toward the stator 10 and extending axially along the stator 10. The engaging 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 engaging portion 50, thereby positioning the insulator cover 16 relative to the insulator 20 in the circumferential direction of the stator 10.

[0050] like Figure 9 and Figure 10 As shown, a rib 60 is formed on the peripheral wall portion 38 of the insulator cover 16 (specifically, the outer peripheral surface 16A of the insulator cover 16). The rib 60 has: a first rib 62, which extends from the fixed end 42A of the cantilever piece 42 to the free end 42B; a second rib 64, which is formed in the portion of the peripheral wall portion 38 other than the cantilever piece 42; and a third rib 66, which is formed on the portion of the cantilever piece 42 on the side of the free end 42B. The first rib 62, the second rib 64, and the third rib 66 all protrude radially outward from the peripheral wall portion 38 towards the stator 10.

[0051] The first rib 62 and the second rib 64 extend circumferentially along the stator 10, and the third rib 66 extends axially along the stator 10. The first rib 62 and the second rib 64 are continuous circumferentially along the stator 10 except that they separate at the free end 42B of the cantilever plate 42. The third rib 66 is formed from the first rib 62 to the end 16B on the stator core 18 side of the insulator cover 16. The first rib 62 has a first portion 62A closer to the fixed end 42A than the third rib 66 and a second portion 62B closer to the free end 42B than the third rib 66.

[0052] The second rib 64 has a first parallel rib 64A and a second parallel rib 64B that are parallel to the circumference of the stator 10, and an inclined rib 64C that is inclined relative to the circumference of the stator 10. The inclined rib 64C is formed between the first parallel rib 64A and the second parallel rib 64B. The inclined rib 64C is inclined toward the second parallel rib 64B and toward the axial side of the stator 10, thereby the second parallel rib 64B is located on the axial side of the stator 10 relative to the first parallel rib 64A.

[0053] The second parallel rib 64B is circumferentially opposite the free end 42B of the cantilever plate 42 in the stator 10. The first parallel rib 64A is formed axially in the stator 10 at the same position as the first rib 62. The second parallel rib 64B is located on one side of the stator 10's axial direction relative to the first rib 62. The third rib 66 is located on the other side of the stator 10's axial direction relative to the first rib 62. The third rib 66 is connected to the first rib 62. Figure 11 As shown, the cross-section of rib 60 (first rib 62, second rib 64 and third rib 66) is rectangular.

[0054] The first parallel rib 64A and the second parallel rib 64B are examples of the "parallel ribs" of this disclosure. The first rib 62 and the second rib 64 are examples of the "radial projection portion" and "circumferential extension portion" of this disclosure. The third rib 66 is an example of the "radial projection portion" and "axial extension portion" of this disclosure.

[0055] like Figure 12 As shown, the stator 10 is housed inside the housing 2 and is fixed to the housing 2 by pressing the stator core 18 into the housing 2. With the stator 10 housed inside the housing 2, the inner circumferential surface 2A of the housing 2 and the outer circumferential surface 16A of the insulator cover 16 are radially opposite to the stator 10. The inner circumferential surface 2A of the housing 2 is an example of the "first opposing surface" of this disclosure, and the outer circumferential surface 16A of the insulator cover 16 is an example of the "second opposing surface" of this disclosure.

[0056] As described above, when the stator core 18 is pressed into the inner side of the housing 2, burrs are generated by the stator core 18 and the housing 2. These burrs contact the winding 22 and scrape off the coating of the winding 22, which may cause insulation defects in the winding 22. Therefore, it is necessary to suppress the outflow of burrs generated by the stator core 18 and the housing 2. Therefore, in this embodiment, ribs 60 are formed in the insulating cover 16 to suppress the outflow of burrs.

[0057] With the stator 10 housed inside the housing 2, a rib 60 is disposed between the inner circumferential surface 2A of the housing 2 and the outer circumferential surface 16A of the insulating cover 16. The rib 60 can be pressed into the inside of the housing 2, can have zero contact with the inner circumferential surface 2A of the housing 2, or can have a gap between it and the inner circumferential surface 2A of the housing 2. When there is a gap between the rib 60 and the inner circumferential surface 2A of the housing 2, the size of the gap is preferably a size that will not allow burrs to flow out.

[0058] like Figure 13As shown, with the stator 10 housed inside the housing 2, a closed space 70 is formed between the inner circumferential surface 2A of the housing 2 and the outer circumferential surface 16A of the insulating cover 16 by the first part 62A of the first rib 62 that is closer to the fixed end 42A than the third rib 66, the third rib 66, and the stator core 18.

[0059] Furthermore, with the stator 10 housed inside the housing 2, a labyrinthine flow path 72 is formed between the inner circumferential surface 2A of the housing 2 and the inner circumferential surface 2A of the insulating cover 16 via the second portion 62B of the first rib 62 (closer to the free end 42B than the third rib 66), the second rib 62, the third rib 66, and the stator core 18. The gap between the first rib 62 and the second rib 64 in the axial direction of the stator 10 is defined as the outlet 72A of the labyrinthine flow path 72. The outlet 72A of the labyrinthine flow path 72 is opposite to the free end 42B of the cantilever plate 42 in the circumferential direction of the stator 10.

[0060] like Figure 14 and Figure 15 As shown, when the rotary motor with stator assembly 1 is mounted on an object with the arrow Z side pointing upwards in the vertical direction, the insulator cover 16 is configured such that the outlets 72A of each labyrinthine flow path 72 open upwards as indicated by the arrows. Specifically, the stator 10, including the insulator cover 16, is fixed to the housing 2 such that the inner product of the vector of the opening direction of the labyrinthine flow path 72 outlet 72A and the vector of the direction of gravity is zero or negative. Thus, when the rotary motor with stator assembly 1 is mounted on an object, the outlets 72A of each labyrinthine flow path 72 open upwards.

[0061] Next, the effects of this embodiment will be explained.

[0062] As detailed above, in the stator assembly 1 of this embodiment, a rib 60 is provided between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulating cover 16. Therefore, the rib 60 can suppress the outflow of burrs generated by the stator core 18 and the housing 2 when the stator core 18 is pressed into the inner side of the housing 2. As a result, it is possible to prevent burrs from contacting the winding 22 (specifically, the winding portion 34) and scraping the coating of the winding 22, thereby preventing poor insulation of the winding 22.

[0063] Furthermore, since the ribs 60 can suppress the outflow of burrs, a press-fit method can be used as the method for fixing the stator core 18 to the housing 2. As a result, it is not necessary to heat-fit the housing 2 to the stator core 18, thus improving the productivity of the stator assembly 1 compared to the heat-fitting method.

[0064] Furthermore, ribs 60 are formed on the outer peripheral surface 16A of the insulating cover 16. Therefore, ribs 60 can be easily formed on the resin insulating cover 16, for example, thus reducing costs compared to forming ribs 60 on the metal housing 2.

[0065] In addition, rib 60 has a first rib 62 and a second rib 64. The first rib 62 and the second rib 64 protrude radially toward the stator 10 and extend circumferentially along the stator 10. Therefore, the movement of burrs toward the axial side of the stator 10 can be suppressed by the first rib 62 and the second rib 64.

[0066] Additionally, rib 60 has a third rib 66. The third rib 66 protrudes radially toward the stator 10 and extends axially along the stator 10. Therefore, the third rib 66 can suppress the circumferential movement of burrs toward the stator 10.

[0067] Furthermore, the first rib 62 extends from the fixed end 42A of the cantilever plate 42 to the free end 42B, and extends circumferentially along the stator 10. The third rib 66 is formed on the free end 42B side of the cantilever plate 42, and extends axially along the stator 10 from the first rib 62 to the end 16B on the stator core 18 side of the insulator cover 16. A closed space 70 is formed between the inner circumferential surface 2A of the housing 2 and the outer circumferential surface 16A of the insulator cover 16 by the first portion 62A of the first rib 62 closer to the fixed end 42A than the third rib 66, the third rib 66, and the stator core 18. Therefore, the outflow of burrs can be suppressed by the closed space 70.

[0068] Furthermore, the second rib 64 is formed in the peripheral wall portion 38 of the insulator cover 16, excluding the cantilever piece 42, and extends circumferentially along the stator 10. Moreover, a labyrinthine flow path 72 is formed between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulator cover 16 through the second portion 62B of the first rib 62 (closer to the free end 42B than the third rib 66), the second rib 64, the third rib 66, and the stator core 18. Therefore, the flow of burrs can be suppressed by the labyrinthine flow path 72.

[0069] Furthermore, the second rib 64 has a first parallel rib 64A and a second parallel rib 64B that are parallel to the circumference of the stator 10, and an inclined rib 64C that is inclined relative to the circumference of the stator 10. Therefore, by making the inclined rib 64C inclined relative to the first parallel rib 64A and the second parallel rib 64B, the rigidity of the second rib 64 can be improved. Thus, for example, even when the rib 60 is pressed into the inside of the housing 2, deformation or breakage of the second rib 64 can be suppressed.

[0070] Furthermore, the outlet 72A of the labyrinthine flow path 72 is opposite to the free end 42B of the cantilever plate 42 in the circumferential direction of the stator 10. Therefore, since the notch of the peripheral wall portion 38 formed by the free end 42B of the cantilever plate 42 is used as the outlet 72A of the labyrinthine flow path 72, the structure of the peripheral wall portion 38 can be simplified.

[0071] Furthermore, as an example, the number of multiple snap-fit ​​structures 40 is three, and the multiple 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 relative to its free end 42B. Therefore, for example, when the stator 10 is arranged with the arrow Z side facing upward in the vertical direction, as shown by the arrow, the outlet 72A of each labyrinthine flow path 72 adjacent to the free end 42B of each cantilever piece 42 can be made to face upward. As a result, burrs can be more effectively suppressed from flowing out of the outlet 72A of the labyrinthine flow path 72.

[0072] Furthermore, the cantilever plate 42 extends in the circumferential direction of the stator 10. Therefore, for example, compared to the case where the cantilever plate 42 extends in the axial direction of the stator 10, the length of the cantilever plate 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 plate 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 plate 42 can be reduced, thus preventing damage to the fixed end 42A of the cantilever plate 42.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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).

[0077] 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.

[0078] 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.

[0079] 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.

[0080] Next, variations of this embodiment will be described.

[0081] (First variation)

[0082] In the above embodiment, the insulator cover 16 is fixed to the insulator 20 by a snap-fit ​​structure 40 having a cantilever piece 42 extending circumferentially along the stator 10, but it can also be fixed to the insulator 20 by other structures. For example, in Figure 16 In the example shown in (A), the insulator cover 16 is secured to the insulator 20 by a snap-fit ​​structure 40 having a cantilever piece 42 extending axially along the stator 10. Additionally, in Figure 16 In the example shown in (B), the insulator cover 16 is fixed to the insulator 20 by molding material 80. Additionally, in Figure 16In the example shown in (C), the insulator cover 16 is fixed to the insulator 20 by pressing the insulator 20 into the inside of the insulator cover 16.

[0083] (Second variation)

[0084] Furthermore, in the above embodiment, the number of multiple snap-fit ​​structures 40 is three, but the number of multiple snap-fit ​​structures 40 can be arbitrary. For example, in Figure 17 In the example shown in (A), the number of multiple snap-fit ​​structures 40 is two. Figure 17 In the example shown in (B), the number of multiple snap-fit ​​structures 40 is four.

[0085] When the number of multiple snap-fit ​​structures 40 is two or three, compared to the case where the number of multiple snap-fit ​​structures 40 is four, the number of outlets 72A of the labyrinthine flow path 72 is less, thus improving the burr outflow suppression effect. On the other hand, when the number of multiple snap-fit ​​structures 40 is three or four, compared to the case where the number of multiple snap-fit ​​structures 40 is two, the number of snap-fit ​​structures 40 is more, thus enabling the insulating cover 16 to be securely fixed to the insulator 20. When the number of multiple snap-fit ​​structures 40 is three, both the burr outflow suppression effect and the fixing force of the insulating cover 16 can be balanced.

[0086] In addition, Figure 17 In the examples shown in (A) and (B) of 17, the exit 72A of each labyrinthine flow path 72 (refer to) Figure 14 All of them are configured with an upward-facing opening as shown by the arrow.

[0087] (Third variation)

[0088] Furthermore, in the above embodiment, the outlets 72A of the plurality of labyrinthine flow paths 72 all open upwards when the rotary motor is mounted on the object, but for example, they may also open upwards as follows: Figure 18 As shown, among the multiple labyrinthine flow paths 72, the outlet 72A of the labyrinthine flow path 72 located on the lower side in the vertical direction opens horizontally as indicated by arrow H when the rotary motor is mounted on the object. Even with the outlet 72A of the labyrinthine flow path 72 opening horizontally, a burr outflow suppression effect can still be achieved.

[0089] (Fourth variation)

[0090] Furthermore, in the above embodiment, rib 60 has a first rib 62, a second rib 64, and a third rib 66, but it may also have other ribs. For example, in Figure 19In the example shown, rib 60 has a fourth rib 82. The fourth rib 82 is connected to the second rib 64 and is formed at the location blocking the outlet 72A of the labyrinth flow path 72. This configuration improves the effect of suppressing burrs from flowing out of the outlet 72A of the labyrinth flow path 72. Alternatively, the fourth rib 82 can also be formed at the free end 42B of the cantilever plate 42. In this case, since the fourth rib 82 is also formed at the location blocking the outlet 72A of the labyrinth flow path 72, the effect of suppressing burrs from flowing out of the outlet 72A of the labyrinth flow path 72 is also improved. The fourth rib 82 is an example of the "radially protruding portion towards the stator" and the "portion extending along the axial direction of the stator" of this disclosure.

[0091] (Fifth variation)

[0092] In addition, such as Figure 20 As shown, rib 60 can also be a circular rib formed around the entire circumference of the peripheral wall portion 38 of the insulating cover 16.

[0093] (Sixth variation)

[0094] In addition, such as Figure 21 As shown, rib 60 can also be a segmented rib that is intermittently formed on the peripheral wall portion 38 of the insulating cover 16.

[0095] (Seventh variation)

[0096] Furthermore, in the above embodiment, the cross-sectional shape of the rib 60 is rectangular, but it can be as follows: Figure 22 As shown in (A), it is a semi-circular shape, or it can be like... Figure 22 As shown in (B), it is a triangular shape, and it can also be like... Figure 22 (C) shows a trapezoidal shape.

[0097] (Eighth variation)

[0098] Furthermore, in the above embodiment, a rib 60 is provided between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulating cover 16, but ribs can also be provided at other locations. For example, in Figure 23 In the example shown, a rib 61 protruding axially toward one side of the stator 10 is also formed on the outer periphery of the top wall portion 36 of the insulator cover 16. The rib 61 is disposed between the back surface 4A of the top wall portion 4 of the housing 2 and the surface 36A of the top wall portion 36 of the insulator cover 16. Forming ribs 60 and 61 on the insulator cover 60 in this way improves the burr outflow suppression effect. Figure 23 The newly added rib 61 in the example shown is an example of the "axially protruding portion" of this disclosure. In addition, the back surface 4A of the top wall portion 4 of the housing 2 is an example of the "first opposing surface" of this disclosure, and the surface 36A of the top wall portion 36 of the insulator cover 16 is an example of the "second opposing surface" of this disclosure.

[0099] In addition, Figure 23 In the example shown, the ribs 60 formed on the peripheral wall portion 38 of the insulating cover 16 can also be omitted. Even with this configuration, the ribs 61 formed on the top wall portion 36 of the insulating cover 16 can suppress burr outflow.

[0100] Additionally, rib 61 is formed on the insulating cover 16, but it can also be formed on the housing 2, or on both the housing 2 and the insulating cover 16. Similarly, in the above embodiment, rib 60 is formed on the insulating cover 16, but it can also be formed on the housing 2, or on both the housing 2 and the insulating cover 16.

[0101] In addition, the variations that can be combined among the above-mentioned variations can be appropriately combined.

[0102] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above. In addition to the above, various modifications and implementations can be made without departing from its spirit.

[0103] Regarding this disclosure, the following notes are made.

[0104] (Note 1)

[0105] A stator assembly, It is a stator assembly (1) of a rotating electric machine, comprising: Formed as a cylindrical shell (2); and The stator (10) is housed inside the housing. The stator includes: The stator core (18) has a plurality of teeth (28) and is pressed into the inside of the housing; Insulator (20), which is mounted on the plurality of said 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 the winding portions from one axial side of the stator. The insulating cover has a second opposing surface (16A, 36A) opposite to the first opposing surface (2A, 4A) of the housing. Ribs (60, 61) are provided between the first opposing surface and the second opposing surface.

[0106] (Note 2)

[0107] According to the stator assembly described in Appendix 1 The rib is formed on the second opposing surface.

[0108] (Note 3)

[0109] According to the stator assembly described in Appendix 1 or Appendix 2 The rib has at least one of the following: a portion that projects radially toward the stator (62, 64, 66); a portion that projects axially toward the stator (61); a portion that extends circumferentially along the stator (62, 64); and a portion that extends axially along the stator (66, 82).

[0110] (Note 4)

[0111] Stator assembly according to any one of Annexes 1 to 3 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) is formed from a portion of the peripheral wall of the insulator cover and extends in the circumferential direction of the stator. One end of the extension direction is a fixed end (42A) and the other end of the extension direction is 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.

[0112] (Note 5)

[0113] According to the stator assembly described in Appendix 4 The first opposing surface is the inner circumferential surface (2A) of the shell. The second opposing surface is the outer peripheral surface (16A) of the insulating cover. The rib has: The first rib (62) is formed from the fixed end of the cantilever plate to the free end and extends circumferentially along the stator; The second rib (64) is formed in the peripheral wall portion of the insulator cover, excluding the cantilever plate, and extends circumferentially along the stator; and The third rib (66) is formed on the free end side of the cantilever plate and extends along the axial direction of the stator from the first rib to the end of the stator core side of the insulator cover.

[0114] (Note 6)

[0115] According to the stator assembly described in Appendix 5 The second rib has: Parallel ribs (64A, 64B) are parallel to the circumferential direction of the stator; and Inclined rib (64C), which is inclined circumferentially relative to the stator.

[0116] (Note 7)

[0117] The stator assembly according to Appendix 5 or Appendix 6 The first portion (62A) of the first rib that is closer to the fixed end than the third rib, the third rib, and the stator core form a closed space 70 between the inner circumferential surface of the housing and the outer circumferential surface of the insulator cover. The second part (62B) of the first rib that is closer to the free end side than the third rib, the second rib, the third rib, and the stator core form a labyrinthine flow path (72) between the inner circumferential surface of the housing and the outer circumferential surface of the insulator cover.

[0118] (Postscript 8)

[0119] According to the stator assembly described in Appendix 7 The outlet of the labyrinthine flow path is opposite to the free end in the circumferential direction of the stator.

[0120] (Note 9)

[0121] According to the stator assembly described in Appendix 8 Includes multiple of the aforementioned snap-fit ​​structures, The plurality of said snap-fit ​​structures include: The first snap-fit ​​structure (40A) has a cantilever piece whose fixed end is located on one circumferential side of the stator relative to the free end; and The second snap-fit ​​structure (40B) has a cantilever piece whose fixed end is located on the other side of the stator in the circumferential direction relative to the free end. The outlet of the labyrinthine flow path opens horizontally or upward when the rotary motor is mounted on the object.

[0122] (Postscript 10)

[0123] The stator assembly according to any one of Annexes 7 to 9 The rib has a fourth rib (82) formed at the location where the outlet of the labyrinthine flow path is blocked.

Claims

1. A stator assembly, which is a stator assembly (1) of a rotating electric machine, comprising: Formed as a cylindrical shell (2); as well as The stator (10) is housed inside the housing. The stator includes: The stator core (18) has a plurality of teeth (28) and is pressed into the inside of the housing; Insulator (20), which is mounted on the plurality of said 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 the winding portions from one axial side of the stator. The insulating cover has a second opposing surface (16A, 36A) opposite to the first opposing surface (2A, 4A) of the housing. Ribs (60, 61) are provided between the first opposing surface and the second opposing surface.

2. The stator assembly according to claim 1, characterized in that, The rib is formed on the second opposing surface.

3. The stator assembly according to claim 1 or 2, characterized in that, The rib has at least one of the following: a portion that projects radially toward the stator (62, 64, 66); a portion that projects axially toward the stator (61); a portion that extends circumferentially along the stator (62, 64); and a portion that extends axially along the stator (66, 82).

4. The stator assembly according to any one of claims 1 to 3, characterized in that, 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) is formed from a portion of the peripheral wall of the insulator cover and extends in the circumferential direction of the stator. One end of the extension direction is a fixed end (42A) and the other end of the extension direction is 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.

5. The stator assembly according to claim 4, characterized in that, The first opposing surface is the inner circumferential surface (2A) of the shell. The second opposing surface is the outer peripheral surface (16A) of the insulating cover. The rib has: The first rib (62) is formed from the fixed end of the cantilever plate to the free end and extends circumferentially along the stator; The second rib (64) is formed in the peripheral wall portion of the insulator cover except for the cantilever plate, and extends circumferentially along the stator; as well as The third rib (66) is formed on the free end side of the cantilever plate and extends along the axial direction of the stator from the first rib to the end of the stator core side of the insulator cover.

6. The stator assembly according to claim 5, characterized in that, The second rib has: Parallel ribs (64A, 64B) are parallel to the circumferential direction of the stator; and Inclined rib (64C), which is inclined circumferentially relative to the stator.

7. The stator assembly according to claim 5 or 6, characterized in that, The first portion (62A) of the first rib that is closer to the fixed end than the third rib, the third rib, and the stator core form a closed space (70) between the inner circumferential surface of the housing and the outer circumferential surface of the insulator cover. The second part (62B) of the first rib that is closer to the free end side than the third rib, the second rib, the third rib, and the stator core form a labyrinthine flow path (72) between the inner circumferential surface of the housing and the outer circumferential surface of the insulator cover.

8. The stator assembly according to claim 7, characterized in that, The outlet of the labyrinthine flow path is opposite to the free end in the circumferential direction of the stator.

9. The stator assembly according to claim 8, characterized in that, Includes multiple of the aforementioned snap-fit ​​structures, The plurality of said snap-fit ​​structures include: The first snap-fit ​​structure (40A) has a cantilever piece whose fixed end is located on one circumferential side of the stator relative to the free end; and The second snap-fit ​​structure (40B) has a cantilever piece whose fixed end is located on the other side of the stator in the circumferential direction relative to the free end. The outlet of the labyrinthine flow path opens horizontally or upward when the rotary motor is mounted on the object.

10. The stator assembly according to any one of claims 7 to 9, characterized in that, The rib has a fourth rib (82) formed at the location where the outlet of the labyrinthine flow path is blocked.

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