Stator

Abstract

The axial length of the stator is shortened. [Solution] The stator (10) is a stator for a brushless motor having 4×n magnetic poles and 6×n slots, where n is a natural number greater than or equal to 1, and is composed of a plurality of stator component units (12) for U, V, and W phases. Each stator component unit includes a pair of core component members (14), a winding, and an insulator. The winding has a pair of winding portions (30) and a crossover wire (32), and the insulator has a pair of insulating portions (36) and a connecting portion (38). The plurality of stator component units are combined with each other at 120° electrical angle offsets around the circumferential direction of the stator. In each stator component unit, the crossover wire is routed along the connecting portion, and the plurality of connecting portions in the plurality of stator component units form circumferentially aligned portions (40, 42) aligned in the circumferential direction of the stator.

Description

[Technical Field]

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

[0002] Conventionally, there is a stator configured with multiple stator component units for U, V, and W phases (see, for example, Patent Document 1). Each stator component unit includes multiple core component members, a winding, and an insulator. The winding has multiple winding portions wound around the multiple core component members, and a crossover wire connecting the multiple winding portions. The insulator has multiple insulating portions that insulate the core component members from the winding portions, and a connecting portion that connects the multiple insulating portions. The crossover wires of each stator component unit are routed along the connecting portion. Furthermore, the connecting portions of each stator component unit are arranged side by side in the axial direction of the stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5502115 Summary of the Invention [Problem to be solved by the invention]

[0004] If the crossover wires and connecting portions of each stator component unit are arranged side by side in the axial direction of the stator, the axial length of the stator increases.

[0005] The technique of the present disclosure provides a stator whose axial length can be shortened compared to conventional stators. [Means for solving the problem]

[0006] The technology disclosed herein relates to a stator (10) for a brushless motor having 4×n magnetic poles and 6×n slots, where n is a natural number of 1 or greater, the stator being composed of a plurality of stator constituent units (12) for U, V, and W phases, each of which includes a pair of core constituent members (14), a pair of winding portions (30) wound around the pair of core constituent members, and a crossover wire (32) connecting the pair of winding portions; and an insulator (18) having a pair of insulating portions (36) that insulate the stator components from each other and a connecting portion (38) that connects the pair of insulating portions together, wherein the plurality of stator component units are combined with each other at an electrical angle of 120° in the circumferential direction of the stator, the crossover wire in each of the stator component units is wired along the connecting portion, and the plurality of connecting portions in the plurality of stator component units form circumferentially aligned portions (40, 42) that are aligned in the circumferential direction of the stator.

[0007] According to the technique of the present disclosure, a stator is provided that can have a shorter axial length than conventional stators. [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 perspective view of a stator configuration unit. [Figure 3] FIG. [Figure 4] FIG. 2 is a schematic diagram showing a stator linearly developed; [Figure 5] FIG. 10 is a schematic view showing a stator according to a first modified example, linearly developed. [Figure 6] FIG. 10 is a schematic view showing a stator according to a second modified example, linearly developed. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the technology of the present disclosure will be described below.

[0010] As shown in FIG. 1, the stator 10 according to this embodiment is a so-called split-core type stator. The basic configuration of a split-core type stator is described in Patent Document 1. The stator 10 according to this embodiment is an improved version of the stator described in Patent Document 1. The stator 10 is applied to an inner-rotor type brushless motor M. That is, a rotor 11 is rotatably housed inside the stator 10, and the stator 10 and the rotor 11 form the brushless motor M.

[0011] The brushless motor M according to this embodiment is a brushless motor in which the rotor 11 has 4×n magnetic poles and the stator 10 has 6×n slots, where n is a natural number equal to or greater than 1. In the example shown in FIG. 1 , n=2, and the brushless motor M is an 8-pole, 12-slot brushless motor in which the rotor 11 has 8 magnetic poles and the stator 10 has 12 slots. The case of 8 poles and 12 slots will be described below as an example.

[0012] The stator 10 is made up of a plurality of stator constituent units 12 (see also FIG. 2) for the U-phase, V-phase, and W-phase. The stator 10 has two stator constituent units 12 for each phase. That is, the number of the plurality of stator constituent units 12 is six.

[0013] Hereinafter, when the multiple stator component units 12 are to be distinguished from one another, the first stator component unit 12 for the U phase will be referred to as "stator component unit 12U1," the second stator component unit 12 for the U phase will be referred to as "stator component unit 12U2," the first stator component unit 12 for the V phase will be referred to as "stator component unit 12V1," the second stator component unit 12 for the V phase will be referred to as "stator component unit 12V2," the first stator component unit 12 for the W phase will be referred to as "stator component unit 12W1," and the second stator component unit 12 for the W phase will be referred to as "stator component unit 12W2."

[0014] As shown in FIG. 2, each stator component unit 12 includes a pair of core component members 14, a winding 16, and an insulator 18. When multiple stator component units 12 are combined, the multiple core component members 14 form an annular stator core 20 (see FIG. 1). Each core component member 14 has a yoke component portion 22 and teeth portions 24. The yoke component portion 22 forms a yoke 26 (see FIG. 1), which is the outer periphery of the stator core 20. The multiple yoke component portions 22 are divided in the circumferential direction of the yoke 26.

[0015] The teeth 24 protrude from the yoke component 22 radially inward of the yoke 26. When multiple stator component units 12 are combined, the multiple teeth 24 extend radially from the center of the stator 10. There are 12 teeth 24. The spaces between adjacent teeth 24 in the circumferential direction of the stator 10 are formed as slots.

[0016] The winding 16 has a pair of winding portions 30 wound around each tooth portion 24, one crossover wire 32 connecting the pair of winding portions 30, and a pair of terminal portions (not shown) at both ends of the winding 16. The terminal portions are terminal portions at the start and end of the winding of the winding 16. The terminal portions are connected to, for example, a circuit board (not shown) provided in the brushless motor M.

[0017] The insulator 18 has a pair of insulating portions 36 and one connecting portion 38. Each insulating portion 36 is attached to a core component 14 and insulates the core component 14 from the winding portion 30. The connecting portion 38 is formed in an arc shape along the circumferential direction of the stator 10 and connects the pair of insulating portions 36 together. In each stator component unit 12, the crossover wire 32 is routed along the connecting portion 38. In each stator component unit 12, the pair of core components 14 are arranged with a gap between them that is equivalent to the spacing of two core components 14 of another phase.

[0018] 3, stator component units 12U1, 12V1, and 12W1 are assembled in the circumferential direction of stator 10 to form an annular first unit 10A. Stator component units 12U2, 12V2, and 12W2 are assembled in the circumferential direction of stator 10 to form an annular second unit 10B. First unit 10A and second unit 10B are assembled in the axial direction of stator 10 to form an integrated unit, thereby forming stator 10.

[0019] 4, the plurality of stator component units 12 (i.e., six stator component units 12) are combined with each other at an electrical angle of 120° in the circumferential direction of the stator 10. The electrical angle of 120° is obtained by dividing 360° by 3, which is the number of phases of the plurality of stator component units 12.

[0020] The connecting portion 38 of the stator component unit 12U1, the connecting portion 38 of the stator component unit 12V1, and the connecting portion 38 of the stator component unit 12W1 are arranged on one axial side of the stator 10. On the other hand, the connecting portion 38 of the stator component unit 12U2, the connecting portion 38 of the stator component unit 12V2, and the connecting portion 38 of the stator component unit 12W2 are arranged on the other axial side of the stator 10.

[0021] The connecting portions 38 of the stator component units 12U1, 12V1, and 12W1 form a first circumferentially aligned portion 40 arranged side by side in the circumferential direction of the stator 10. The connecting portions 38 of the stator component units 12U2, 12V2, and 12W2 form a second circumferentially aligned portion 42 arranged side by side in the circumferential direction of the stator 10. The first circumferentially aligned portion 40 and the second circumferentially aligned portion 42 are formed in an annular shape along the circumferential direction of the stator 10. The first circumferentially aligned portion 40 and the second circumferentially aligned portion 42 are an example of a "circumferentially aligned portion" according to the technology of the present disclosure.

[0022] Next, the effects of this embodiment will be described.

[0023] As described above in detail, the stator 10 according to this embodiment is a stator 10 for a brushless motor M having 4×n magnetic poles and 6×n slots, where n is a natural number greater than or equal to 1, and is made up of a plurality of stator component units 12 for U, V, and W phases. Each stator component unit 12 includes a pair of core component members 14, a winding 16, and an insulator 18. The winding 16 has a pair of winding portions 30 wound around the pair of core component members 14 and a crossover wire 32 connecting the pair of winding portions 30. The insulator 18 is attached to the pair of core component members 14 and has a pair of insulating portions 36 that insulate the core component members 14 from the winding portions 30 and a connecting portion 38 that connects the pair of insulating portions 36 together. The multiple stator component units 12 are combined with each other at an electrical angle of 120° in the circumferential direction of the stator 10, and in each stator component unit 12, the crossover wires 32 are routed along the connecting portions 38, and the connecting portions 38 in the multiple stator component units 12 form a first circumferentially aligned portion 40 and a second circumferentially aligned portion 42 that are arranged side by side in the circumferential direction of the stator 10. With this configuration, the axial length of the stator 10 can be shortened compared to when the crossover wires 32 and connecting portions 38 of each stator component unit 12 are arranged side by side in the axial direction of the stator 10.

[0024] Furthermore, the first circumferentially arranged portion 40 is disposed on one axial side of the stator 10, and the second circumferentially arranged portion 42 is disposed on the other axial side of the stator 10. Here, for example, if the first circumferentially arranged portion 40 and the second circumferentially arranged portion 42 are disposed together on one axial side of the stator 10, the distance between the crossover wires 32 routed along the first circumferentially arranged portion 40 and the crossover wires 32 routed along the second circumferentially arranged portion 42 becomes short, and therefore, an insulating member needs to be added between the crossover wires 32 routed along the first circumferentially arranged portion 40 and the crossover wires 32 routed along the second circumferentially arranged portion 42. In contrast, if the first circumferentially arranged portion 40 is disposed on one axial side of the stator 10 and the second circumferentially arranged portion 42 is disposed on the other axial side of the stator 10, the distance between the crossover wires 32 routed along the first circumferentially arranged portion 40 and the crossover wires 32 routed along the second circumferentially arranged portion 42 can be increased, and therefore, no insulating member needs to be added. This makes it possible to avoid an increase in the number of components, thereby suppressing increases in costs.

[0025] Next, a modification of this embodiment will be described.

[0026] In the above embodiment, stator 10 is applied to a brushless motor where n=2 (i.e., an 8-pole, 12-slot brushless motor), but it may also be applied to a brushless motor where n=1 (i.e., a 4-pole, 6-slot brushless motor), or a brushless motor where n=3 (i.e., a 12-pole, 18-slot brushless motor), or a brushless motor where n=4 (i.e., a 16-pole, 24-slot brushless motor), or a brushless motor where n=5 (i.e., a 20-pole, 30-slot brushless motor), or a brushless motor where n=6 (i.e., a 24-pole, 36-slot brushless motor). Stator 10 may also be applied to a brushless motor where n≧7.

[0027] Furthermore, in the above embodiment, the first circumferential arrangement portion 40 is arranged on one axial side of the stator 10, and the second circumferential arrangement portion 42 is arranged on the other axial side of the stator 10, but the first circumferential arrangement portion 40 and the second circumferential arrangement portion 42 may be arranged together on one axial side of the stator 10.

[0028] Furthermore, in the above embodiment, the first circumferentially aligned portion 40 and the second circumferentially aligned portion 42 are formed in an annular shape, but they may also be formed in a shape with a partial break in the circumferential direction (for example, a C-shape or an arc shape).

[0029] 5 shows a first modified example of the stator 10 that is applied to a 12-pole, 18-slot brushless motor. In the first modified example, the number of stator component units 12 is nine. Hereinafter, the third stator component unit 12 for the U phase will be referred to as "stator component unit 12U3," the third stator component unit 12 for the V phase will be referred to as "stator component unit 12V3," and the third stator component unit 12 for the W phase will be referred to as "stator component unit 12W3."

[0030] Stator component unit 12U1, stator component unit 12V1, stator component unit 12W1, and stator component unit 12W2 are assembled together to form first unit 10A. Stator component unit 12U2, stator component unit 12U3, stator component unit 12V2, stator component unit 12V3, and stator component unit 12W3 are assembled together to form second unit 10B. First unit 10A and second unit 10B are assembled from the axial direction of stator 10 to be integrated, thereby forming stator 10.

[0031] The plurality of stator constituent units 12 (that is, nine stator constituent units 12) are combined in a state where they are shifted by an electrical angle of 120° in the circumferential direction of the stator 10.

[0032] The connecting portions 38 of the stator component units 12U1, 12V1, 12W1, and 12W2 are arranged on one axial side of the stator 10 and form a first circumferentially aligned portion 40 arranged side by side in the circumferential direction of the stator 10. On the other hand, the connecting portions 38 of the stator component units 12U2, 12U3, 12V2, 12V3, and 12W3 are arranged on the other axial side of the stator 10 and form a second circumferentially aligned portion 42 arranged side by side in the circumferential direction of the stator 10.

[0033] The first circumferentially aligned portion 40 and the second circumferentially aligned portion 42 are formed in a shape (for example, a C-shape or an arc shape) with a portion thereof interrupted in the circumferential direction. In the second unit 10B, the connecting portion 38 of the stator component unit 12U3 and the connecting portion 38 of the stator component unit 12V2 are partially overlapped in the axial direction of the stator 10, and a portion of the second circumferentially aligned portion 42 has a two-stage configuration.

[0034] FIG. 6 shows a second modified example of stator 10 that is applied to a 12-pole, 18-slot brushless motor. In this second modified example, stator component units 12U1, 12U2, 12U3, 12V1, 12V2, 12W1, 12W2, and 12W3 are assembled together to form first unit 10A. Stator component unit 12V3 forms second unit 10B. First unit 10A and second unit 10B are assembled axially of stator 10 to form a single unit, thereby forming stator 10.

[0035] The plurality of stator constituent units 12 (that is, nine stator constituent units 12) are combined in a state where they are shifted by an electrical angle of 120° in the circumferential direction of the stator 10.

[0036] The connecting portions 38 of the stator component units 12U1, 12U2, 12U3, 12V1, 12V2, 12W1, 12W2, and 12W3 are arranged on one axial side of the stator 10 and form a circumferentially aligned portion 44 arranged side by side in the circumferential direction of the stator 10. The circumferentially aligned portion 44 has a two-stage configuration, with first-stage connecting portions 38 arranged side by side in the circumferential direction of the stator 10 and second-stage connecting portions 38 arranged side by side in the circumferential direction of the stator 10.

[0037] The modifications shown in FIGS. 5 and 6 also provide the same effects as the above embodiment.

[0038] The above describes one embodiment of the technology of the present disclosure, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modifications within the scope of the gist of the present disclosure.

[0039] Below, supplementary notes are provided regarding the technology of the present disclosure. (Appendix 1) A stator (10) for a brushless motor having 4×n magnetic poles and 6×n slots, where n is a natural number equal to or greater than 1, The rotor is configured by a plurality of stator component units (12) for U-phase, V-phase, and W-phase, Each of the stator constituent units is A pair of core components (14); a winding (16) having a pair of winding portions (30) wound around the pair of core constituent members and a crossover wire (32) connecting the pair of winding portions; an insulator (18) attached to the pair of core constituent members and having a pair of insulating portions (36) that insulate the core constituent members from the winding portion, and a connecting portion (38) that connects the pair of insulating portions together; Equipped with The plurality of stator constituent units are combined in a state where they are shifted by an electrical angle of 120° in the circumferential direction of the stator, In each of the stator component units, the crossover wire is routed along the connecting portion, The plurality of connecting portions in the plurality of stator constituent units form circumferentially aligned portions (40, 42, 44) that are aligned in the circumferential direction of the stator. Stator. (Appendix 2) The circumferentially aligned portions include first circumferentially aligned portions (40) and second circumferentially aligned portions (42), the first circumferentially arranged portion is disposed on one axial side of the stator, The second circumferentially arranged portion is disposed on the other axial side of the stator. 2. The stator of claim 1. [Explanation of symbols]

[0040] 10... stator, 10A... first unit, 10B... second unit, 11... rotor, 12... stator component unit, 14... core component member, 16... winding, 18... insulator, 20... stator core, 22... yoke component portion, 24... teeth portion, 26... yoke, 30... winding portion, 32... crossover wire, 36... insulating portion, 38... connecting portion, 40... first circumferentially arranged portion, 42... second circumferentially arranged portion, 44... circumferentially arranged portion

Claims

1. A stator (10) for a brushless motor having 4×n magnetic poles and 6×n slots, where n is a natural number of 1 or more, It is composed of a plurality of stator constituent units (12) of U-phase, V-phase, and W-phase, Each of the stator constituent units is A pair of core components (14); a winding (16) having a pair of winding portions (30) wound around the pair of core constituent members and a crossover wire (32) connecting the pair of winding portions; an insulator (18) attached to the pair of core constituent members and having a pair of insulating portions (36) that insulate the core constituent members from the winding portion, and a connecting portion (38) that connects the pair of insulating portions together; Equipped with The plurality of stator constituent units are combined in a state where they are shifted by an electrical angle of 120° in the circumferential direction of the stator, In each of the stator component units, the crossover wire is routed along the connecting portion, The plurality of connecting portions in the plurality of stator constituent units form circumferentially aligned portions (40, 42, 44) that are aligned in the circumferential direction of the stator. Stator.

2. The circumferentially aligned portions include a first circumferentially aligned portion (40) and a second circumferentially aligned portion (42), the first circumferentially arranged portion is disposed on one axial side of the stator, The second circumferentially arranged portion is disposed on the other axial side of the stator. The stator according to claim 1 .

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