Brushless motor

Abstract

To provide a brushless motor in which a rotor can be inserted inside a stator from both sides in the axial direction of the stator.SOLUTION: A stator 10 includes a stator core 20, a plurality of windings 16, and an insulator 18. The stator core 20 is composed of a plurality of core-constituting portions 14 having a plurality of yoke-constituting portions 22 and a plurality of teeth portions 24 protruding from the yoke-constituting portion 22. The plurality of windings 16 has a plurality of winding portions 26 wound around the teeth portions 24. The plurality of insulators 18 are attached to the core-constituting portion 14 and have a plurality of insulating portions 32 for insulating the teeth portions 24 and the winding portion 26, and a plurality of connecting rings 34 for connecting the plurality of insulating portions 32. The inner diameter of each of the connecting rings 34 is set larger than the outer diameter of a rotor 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a brushless motor. [Background technology]

[0002] Conventionally, the following brushless motor has been known (see, for example, Patent Document 1). That is, the brushless motor described in Patent Document 1 includes a stator and a rotor arranged inside the stator. The stator includes a stator core, multiple windings, and an insulator. The stator core is configured from multiple core components that form an annular yoke and have multiple yoke components divided in the circumferential direction of the yoke, and multiple teeth that protrude from each yoke component in the radial direction of the yoke.

[0003] The plurality of windings have a plurality of winding portions wound around each tooth portion. The plurality of insulators are attached to each core component and have a plurality of insulating portions that insulate the teeth portion from the winding portions, and a plurality of connecting rings that connect the insulating portions. The plurality of connecting rings are all disposed at one axial end of the stator, and the inner diameter of each connecting ring is set to be smaller than the outer diameter of the rotor disposed inside the stator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5502115 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as in the brushless motor described in Patent Document 1, when multiple connecting rings are all disposed at one axial end of the stator and the inner diameter of each connecting ring is set to a dimension smaller than the outer diameter of the rotor, the rotor cannot be inserted into the stator from one axial end of the stator, which creates the constraint that the rotor must be inserted into the stator from the other axial end of the stator.

[0006] The present invention has been made in view of the above-mentioned problems, and has an object to provide a brushless motor in which a rotor can be inserted into the inside of a stator from both axial sides of the stator. [Means for solving the problem]

[0007] In order to solve the above problem, a brushless motor according to claim 1 includes a stator and a rotor disposed inside the stator, wherein the stator includes a stator core constituted by a plurality of core components each having a plurality of yoke components that form an annular yoke and are divided in the circumferential direction of the yoke, and a plurality of teeth components that protrude from each of the yoke components in the radial direction of the yoke, a plurality of windings each having a plurality of winding portions wound around each of the teeth components, and a plurality of insulators attached to each of the core components and each having a plurality of insulating portions that insulate the teeth components from the winding portions and a plurality of connecting rings that connect the plurality of insulating portions, and an inner diameter of each of the connecting rings is set to a dimension larger than an outer diameter of the rotor. The outer diameter of each of the connecting rings is set to be smaller than the inner diameter of the stator core. . In addition, in order to solve the above problem, the brushless motor described in claim 2 comprises a stator and a rotor arranged inside the stator, wherein the stator comprises a stator core composed of a plurality of core components each having a plurality of yoke components that form an annular yoke and are divided circumferentially around the yoke, and a plurality of teeth components that protrude radially from each of the yoke components, a plurality of windings each having a plurality of winding portions wound around each of the teeth components, and a plurality of insulators attached to each of the core components and having a plurality of insulating portions that insulate the teeth components from the winding portions and a plurality of connecting rings that connect the plurality of insulating portions, wherein the inner diameter of each of the connecting rings is set to a dimension larger than the outer diameter of the rotor, and the plurality of connecting rings are arranged radially between the stator core and the rotor.

[0008] In this brushless motor, the inner diameter of each connecting ring is set larger than the outer diameter of the rotor. Therefore, the rotor can be inserted into the stator from one axial side of the stator, or from the other axial side of the stator. In other words, the rotor can be inserted into the stator from both axial sides.

[0009] In addition, in the brushless motor according to claim 1,The outer diameter of each of the connecting rings is set to be smaller than the inner diameter of the stator core. 。

[0010] In this brushless motor, the outer diameter of each connecting ring is set smaller than the inner diameter of the stator core, which allows each connecting ring to be positioned inside the stator core, thereby preventing the stator from becoming too large in the axial direction.

[0011] In addition, in the brushless motor according to claim 2, The plurality of connecting rings are disposed radially between the stator core and the rotor. 。

[0012] In this brushless motor, the multiple connecting rings are disposed radially between the stator core and the rotor, thereby making it possible to effectively utilize the radial space between the stator core and the rotor as a space for arranging the multiple connecting rings.

[0013] Claim 3 The brushless motor described in Claim 1 or Claim 2 In the brushless motor described in the above, the plurality of connecting rings are arranged side by side in the axial direction of the stator.

[0014] In this brushless motor, the multiple connecting rings are arranged side by side in the axial direction of the stator, which prevents the multiple connecting rings from protruding in the radial direction, thereby preventing the stator from becoming too large in the radial direction.

[0015] Claim 4 The brushless motor described in claim 1 to claim 2 Claim 3 In the brushless motor described in any one of the above, the end portion on the one axial side of the first connecting ring, which is arranged furthest on one axial side of the stator among the plurality of connecting rings, is a brushless motor in which the end portion on the one axial side of the first connecting ring is located on the other axial side of the stator than the ends on the one axial side of the plurality of winding portions.

[0016] In this brushless motor, the end of the first axial direction of the first connecting ring, which is the connecting ring closest to the stator in the axial direction, is located closer to the stator in the axial direction than the ends of the winding portions in the axial direction. This prevents the end of the first axial direction of the first connecting ring from protruding beyond the ends of the winding portions in the axial direction. This prevents the stator from becoming too large in the axial direction.

[0017] Claim 5 The brushless motor described in Claim 4 In the brushless motor described in the above, the end portion on the other axial side of the second connecting ring, which is positioned furthest to the other axial side of the stator among the plurality of connecting rings, is located on the one axial side of the stator relative to the ends on the other axial side of the plurality of winding portions.

[0018] In this brushless motor, the end of the second connecting ring, which is the second connecting ring positioned furthest from the other axial side of the stator among the multiple connecting rings, is located closer to the one axial side of the stator than the other axial ends of the multiple winding portions. This prevents the other axial end of the second connecting ring from protruding beyond the other axial ends of the multiple winding portions. This prevents the stator from becoming too large in the axial direction.

[0019] Claim 6 The brushless motor described in Claim 4 or Claim 5 In the brushless motor described in the above item 1, the plurality of connecting rings are all arranged at one end of the stator on the axial side. The brushless motor is arranged in the

[0020] In this brushless motor, the multiple connecting rings are all disposed at one axial end of the stator, and therefore no connecting ring is disposed at the other axial end of the stator, simplifying the configuration of the other axial end of the stator.

[0021] Claim 7 The brushless motor described in Claim 5 In the brushless motor described in the above, the first connecting ring is arranged at one end of the stator in the axial direction, and the second connecting ring is arranged at the other end of the stator in the axial direction.

[0022] In this brushless motor, the first connection ring is disposed at one axial end of the stator, and the second connection ring is disposed at the other axial end of the stator. Therefore, since the first connection ring and the second connection ring are disposed separately at one axial end and the other axial end of the stator, the configuration of the one axial end and the other axial end of the stator can be simplified in a balanced manner.

[0023] Claim 8 The brushless motor described in claim 1 to claim 2 Claim 7 In the brushless motor described in any one of the above, the plurality of windings have a plurality of jumper wires connecting the plurality of winding portions, and the plurality of jumper wires are wired radially outside the plurality of connecting rings.

[0024] In this brushless motor, the windings have multiple crossover wires connecting the multiple winding portions, and the crossover wires are routed radially outward from the connecting rings. Therefore, when assembling the multiple stator components that make up the stator, the crossover wires can be prevented from interfering with the connecting rings. This improves workability when assembling the multiple stator components.

[0025] Claim 9 The brushless motor described in Claim 8In the brushless motor described in the above, the plurality of core constituent parts, the plurality of windings, and the plurality of insulators constitute a plurality of stator constituent parts, which are assembled together in the axial direction of the stator, and the crossover wire provided in one of the plurality of stator constituent parts is wired in a position that is away from a position where it would interfere with the core constituent parts provided in other of the plurality of stator constituent parts when the plurality of stator constituent parts are assembled together in the axial direction of the stator.

[0026] In this brushless motor, the crossover wires provided in one of the multiple stator components are routed in a position that avoids interference with the core components provided in other of the multiple stator components when the multiple stator components are assembled together axially. Therefore, when the multiple stator components are assembled, interference between the crossover wires and the core components can be avoided. This improves workability when assembling the multiple stator components.

[0027] Claim 10 The brushless motor described in Claim 9 In the brushless motor described in , each of the crossover wires is shaped so that it extends radially outward from the stator component and then extends radially inward from the stator component.

[0028] In this brushless motor, each crossover wire is shaped so that it extends radially outward from the stator component and then faces radially inward from the stator component, thereby consolidating the crossover wires into the radially inner portion of the stator component. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view of a stator according to an embodiment of the present invention. [Figure 2A] FIG. 2 is a perspective view of a U-phase stator component. [Figure 2B] FIG. 2 is a perspective view of a V-phase stator component. [Figure 2C] FIG. 2 is a perspective view of a W-phase stator component. [Figure 3] 10 is a perspective view showing a state in which one winding portion and one crossover wire are formed by a winding in a U-phase stator component. FIG. [Figure 4A] 10A and 10B are perspective views showing a process in which a plurality of stator components are assembled together. [Figure 4B] FIG. 4B is a perspective view showing a state where assembly has progressed further than in FIG. 4A. [Figure 4C] FIG. 2 is a perspective view showing a state in which a plurality of stator components are assembled together. [Figure 5] FIG. 4 is a vertical cross-sectional view showing the periphery of a plurality of connecting rings. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 7 is an enlarged view of part A in FIG. 6. [Figure 10] FIG. 9 is an enlarged view of part B in FIG. 8. [Figure 11] 10 is an explanatory diagram showing how a U-phase crossover wire is shaped after a plurality of stator components are assembled together. FIG. [Figure 12] 10 is an explanatory diagram showing how a V-phase crossover wire is formed after a U-phase crossover wire has been shaped; FIG. [Figure 13] 10 is an explanatory diagram showing how a W-phase crossover wire is formed after a V-phase crossover wire has been shaped; FIG. [Figure 14] 1 is a perspective view of a brushless motor including a stator and a rotor; [Figure 15] 1 is a longitudinal sectional view showing a first example of the cross-sectional structure of a brushless motor. [Figure 16] FIG. 10 is a longitudinal sectional view showing a second example of the cross-sectional structure of the brushless motor. [Figure 17] FIG. 10 is a vertical cross-sectional view showing a third example of the cross-sectional structure of a brushless motor. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0031] A stator 10 according to one embodiment of the present invention shown in FIG. 1 is used in an inner rotor type brushless motor 60 (see FIG. 14), which will be described later. The brushless motor 60 is, as an example, an 8-pole, 12-slot brushless motor. In each drawing, an arrow A1 indicates one axial side of the stator 10, and an arrow A2 indicates the other axial side of the stator 10. The stator 10 is made up of a U-phase stator component 12U, a V-phase stator component 12V, and a W-phase stator component 12W, as shown in FIGS. 2A to 2C.

[0032] As shown in Fig. 2A (also see Fig. 3 as appropriate), U-phase stator component 12U is configured to have multiple core components 14U, windings 16U, and insulators 18U. The multiple core components 14U, together with multiple V-phase core components 14V and multiple W-phase core components 14W (described later), form an annular stator core 20 (see Fig. 1), and each core component 14U has a yoke component 22U and teeth 24U. The number of multiple core components 14U is, for example, four.

[0033] The plurality of yoke components 22U, together with a plurality of V-phase yoke components 22V and a plurality of W-phase yoke components 22W (described later), form an annular yoke 40 (see FIG. 1), and are each formed in an arc shape. The plurality of teeth 24U are formed integrally with the plurality of yoke components 22U, respectively, and protrude from each yoke component 22U toward the radial inside of the yoke 40 (see FIG. 1).

[0034] The winding 16U constitutes a U-phase and has a plurality of winding portions 26U and a plurality of crossover wires 28U. The plurality of winding portions 26U are wound concentrically around the teeth 24U via insulating portions 32U (described later) and are connected to each other by a plurality of crossover wires 28U. Terminal portions 30U on both ends of the winding 16U are led out from the teeth 24U to one axial side of the stator component 12U.

[0035] The insulator 18U is made of resin and integrally includes a plurality of insulating portions 32U and a connecting ring 34U. The number of insulating portions 32U is the same as the number of core constituent portions 14U. Each insulating portion 32U is attached to the core constituent portion 14U, thereby being integrated with the core constituent portion 14U. For example, the insulating portions 32U are arranged at equal intervals.

[0036] A pair of guide grooves 36U is formed in each insulating portion 32U. The pair of guide grooves 36U is formed on both side surfaces of each insulating portion 32U. The side surfaces of each insulating portion 32U form the side surfaces of V-shaped slots formed between adjacent teeth 24U. The pair of guide grooves 36U each extend in the axial direction of the stator component 12U. The inner circumferential portion of the insulating portion 32U forms the inner circumferential surface of the stator 10, and the pair of guide grooves 36U are formed in the portion of the insulating portion 32U on the inner circumferential side.

[0037] The winding start and winding end of the winding portion 26U are inserted into the pair of guide grooves 36U, respectively. The crossover wire 28U connects the winding start and winding end of adjacent winding portions 26U of the winding 16U, and is wired on one axial side of the stator component 12U. The crossover wire 28U has slack and spreads outward in the radial direction of the stator component 12U. The central portion of the crossover wire 28U (i.e., the portion between adjacent core components 14U) is wired at a position passing through the radial outside of the stator core 20. As will be described later, the crossover wire 28U is shaped from its state of spreading outward in the radial direction of the stator component 12U to its radial inside in the radial direction of the stator component 12U (see FIG. 1).

[0038] The connecting ring 34U is formed integrally with the inner circumferential portions of the plurality of insulating portions 32U. The connecting ring 34U is provided at one axial end of the stator component 12U. The connecting ring 34U is formed in a ring shape along the circumferential direction of the stator component 12U and connects the plurality of insulating portions 32U.

[0039] The V-phase stator component 12V shown in Fig. 2B has the same basic configuration as the above-described U-phase stator component 12U. That is, this V-phase stator component 12V is configured to include a plurality of core components 14V, windings 16V, and insulators 18V. The plurality of core components 14V, windings 16V, and insulators 18V have the same configuration as the plurality of core components 14U, windings 16U, and insulators 18U (all of which are shown in Fig. 2A).

[0040] Referring to the above description of the U-phase stator component 12U, the configuration of the V-phase stator component 12V shown in FIG. 2B will be briefly described. Each of the multiple core components 14V has a yoke component 22V and a tooth portion 24V. The winding 16V constitutes the V-phase and has multiple winding portions 26V and multiple crossover wires 28V. Terminal portions 30V on both ends of the winding 16V are led out from the tooth portion 24V to one axial side of the stator component 12V. The insulator 18V integrally includes multiple insulating portions 32V and a connecting ring 34V. Each insulating portion 32V has a pair of guide grooves 36V formed therein.

[0041] The crossover wire 28V connects the winding start and winding end of adjacent winding portions 26V of the winding 16V, and is wired on one axial side of the stator component 12V. The crossover wire 28V has slack and spreads outward in the radial direction of the stator component 12V. As will be described later, the crossover wire 28V is reshaped from its state of spreading outward in the radial direction of the stator component 12V to its state of spreading outward in the radial direction of the stator component 12V (see FIG. 1). The connecting ring 34V is formed integrally with the inner peripheries of the multiple insulating portions 32V, and connects the multiple insulating portions 32V.

[0042] The W-phase stator component 12W shown in Fig. 2C has the same basic configuration as the above-described U-phase stator component 12U. That is, this W-phase stator component 12W is configured to include a plurality of core components 14W, windings 16W, and insulators 18W. The plurality of core components 14W, windings 16W, and insulators 18W have the same configuration as the plurality of core components 14U, windings 16U, and insulators 18U (all of which are shown in Fig. 2A).

[0043] Referring to the above description of the U-phase stator component 12U, the configuration of the V-phase stator component 12W shown in FIG. 2C will be briefly described. Each of the multiple core components 14W has a yoke component 22W and a tooth portion 24W. The winding 16W constitutes the W-phase and has multiple winding portions 26W and multiple crossover wires 28W. Terminal portions 30W on both ends of the winding 16W are extended from the tooth portion 24W to one axial side of the stator component 12W. The insulator 18W integrally includes multiple insulating portions 32W and a connecting ring 34W. Each insulating portion 32W has a pair of guide grooves 36W formed therein.

[0044] The crossover wire 28W connects the winding start and winding end of adjacent winding portions 26W of the winding 16W, and is wired on one axial side of the stator component 12W. The crossover wire 28W has slack and spreads outward in the radial direction of the stator component 12W. As will be described later, the crossover wire 28W is reshaped from its state of spreading outward in the radial direction of the stator component 12W toward the inside of the stator component 12W (see FIG. 1). The connecting ring 34W is formed integrally with the inner peripheries of the multiple insulating portions 32W, and connects the multiple insulating portions 32W.

[0045] In the following description, when there is no need to distinguish between U-phase, V-phase, and W-phase for each member and each part, the letters U, V, and W will be omitted from the end of the reference numeral for convenience.

[0046] 4A to 4C, the multiple stator components 12U, 12V, and 12W are assembled together to form stator 10. As an example, stator component 12V is assembled to stator component 12U from one axial side of stator component 12U, and stator component 12W is assembled to stator components 12U and 12V from one axial side of stator components 12U and 12V.

[0047] In stator 10, which is configured by assembling multiple stator components 12U, 12V, and 12W together, multiple yoke components 22U, 22V, and 22W form an annular yoke 40. In other words, yoke 40 is divided into multiple yoke components 22U, 22V, and 22W in the circumferential direction. These multiple yoke components 22U, 22V, and 22W are fitted between pairs of yoke components 22 adjacent to each other on both sides.

[0048] Furthermore, the multiple connection rings 34U, 34V, and 34W are arranged radially inside the yoke 40. As an example, the multiple connection rings 34U, 34V, and 34W are arranged side by side in the axial direction of the stator 10. That is, the multiple connection rings 34U, 34V, and 34W are arranged in overlapping positions when viewed from the axial direction of the stator 10 (see also FIG. 5). As an example, the multiple connection rings 34U, 34V, and 34W each have the same inner diameter and outer diameter.

[0049] The multiple crossover wires 28U, 28V, 28W are all wired radially outward from the multiple connecting rings 34U, 34V, 34W. The multiple crossover wires 28U, 28V, 28W are wired on one axial side of the multiple stator components 12U, 12V, 12W, and have slack. As described above, the central portion of the crossover wire 28U (i.e., the portion between adjacent core components 14U) is wired at a position passing through the radially outer side of the stator core 20 (see also FIGS. 6 and 8). Similarly, the central portion of the crossover wire 28V (i.e., the portion between adjacent core components 14V) is wired at a position passing through the radially outer side of the stator core 20. The central portion of the crossover wire 28W (i.e., the portion between adjacent core components 14W) is wired at a position passing through the radially outer side of the stator core 20.

[0050] Crossover wire 28U provided in U-phase stator component 12U has slack that allows core components 14V, 14W to be inserted inside crossover wire 28U that extends radially outward from stator component 12U when stator components 12V, 12W are assembled to stator component 12U from the axial direction of stator 10. In other words, crossover wire 28U provided in U-phase stator component 12U is wired at a position that is away from positions that would interfere with core components 14V, 14W when stator components 12V, 12W are assembled to stator component 12U from the axial direction of stator 10.

[0051] Furthermore, crossover wire 28V provided in V-phase stator component 12V has slack that allows core component 14W to be inserted inside crossover wire 28V expanding radially outward from stator component 12V when stator component 12W is assembled to stator components 12U and 12V from the axial direction of stator 10. In other words, crossover wire 28V provided in V-phase stator component 12V is wired at a position that is away from a position where it will interfere with core component 14W when stator component 12W is assembled to stator components 12U and 12V from the axial direction of stator 10.

[0052] As shown in Figures 6 to 10, when stator 10 is constructed by assembling multiple stator components 12U, 12V, and 12W together, multiple crossover wires 28U, 28V, and 28W are arranged on one axial side of stator 10 and are overlapped with each other in the axial direction of stator 10.

[0053] As shown in Fig. 11, after the multiple stator components 12U, 12V, and 12W are assembled together, the crossover wire 28U is reshaped from a state in which it spreads radially outward from the stator component 12U to a state in which it spreads radially inward from the stator component 12U. Similarly, as shown in Fig. 12, the crossover wire 28V is reshaped from a state in which it spreads radially outward from the stator component 12V to a state in which it spreads radially inward from the stator component 12V. Furthermore, as shown in Fig. 13, the crossover wire 28W is reshaped from a state in which it spreads radially outward from the stator component 12W to a state in which it spreads radially inward from the stator component 12W. Even after reshaping, the multiple crossover wires 28U, 28V, and 28W remain wired radially outward from the multiple connecting rings 34U, 34V, and 34W.

[0054] 14, a rotor 50 is inserted radially inside the stator 10. The rotor 50 has a rotor shaft 52 and a rotor body 54. The stator 10 and the rotor 50 constitute a brushless motor 60.

[0055] 15, the multiple connection rings 34U, 34V, and 34W are all arranged at one axial end of the stator 10. The multiple connection rings 34U, 34V, and 34W arranged side by side in the axial direction of the stator 10 have the same inner diameter D1, for example. The inner diameter D1 of each of the connection rings 34U, 34V, and 34W is set to be larger than the outer diameter d1 of the rotor 50. The outer diameter d1 of the rotor 50 corresponds to the diameter of the outer circumferential surface of the rotor 50.

[0056] Additionally, the outer diameter D2 of each of the connecting rings 34U, 34V, 34W is set to a dimension smaller than the inner diameter d2 of the stator core 20. The inner diameter d2 of the stator core 20 corresponds to the diameter of the inner peripheral surface of the stator core 20. The multiple connecting rings 34U, 34V, 34W are arranged radially between the stator core 20 and the rotor 50 (i.e., the dimensional difference Δd between the outer diameter d1 and the inner diameter d2).

[0057] Furthermore, of the multiple connection rings 34U, 34V, and 34W, the connection ring 34W is positioned closest to one axial side of the stator 10, and the end 34A on one axial side of the connection ring 34W is located on the other axial side of the stator 10 relative to the ends 26A on one axial side of the multiple winding portions 26 (i.e., line La passing through the ends 26A and extending in the radial direction of the stator 10). Furthermore, the end 34A on one axial side of the connection ring 34W is located on the other axial side of the stator 10 relative to the end 32A on one axial side of the inner circumferential wall of the insulating portion 32. The connection ring 34W is an example of a "first connection ring."

[0058] Furthermore, the connecting ring 34U is positioned furthest to the other axial side of the stator among the multiple connecting rings 34U, 34V, 34W, and the end 34B on the other axial side of the connecting ring 34U is located on one axial side of the stator 10 relative to the ends 26B on the other axial side of the multiple winding portions 26 (i.e., line Lb passing through the ends 26B and extending in the radial direction of the stator 10). Furthermore, the end 34B on one axial side of the connecting ring 34U is located on one axial side of the stator 10 relative to the end 32B on the other axial side of the inner circumferential wall of the insulating portion 32. The connecting ring 34U is an example of a "second connecting ring."

[0059] Next, the operation and effects of one embodiment of the present invention will be described.

[0060] As described above in detail, in brushless motor 60 according to one embodiment of the present invention, inner diameter D1 of each connecting ring 34U, 34V, 34W is set to a dimension larger than outer diameter d1 of rotor 50 disposed inside stator 10. Therefore, rotor 50 can be inserted into stator 10 from one axial side of stator 10, and rotor 50 can also be inserted into stator 10 from the other axial side of stator 10. In other words, rotor 50 can be inserted into stator 10 from both axial sides of stator 10.

[0061] Furthermore, the outer diameter D2 of each of the connecting rings 34U, 34V, and 34W is set to a dimension smaller than the inner diameter d2 of the stator core 20. Therefore, each of the connecting rings 34U, 34V, and 34W can be disposed inside the stator core 20, which prevents the size of the stator 10 from increasing in the axial direction.

[0062] Furthermore, the multiple connection rings 34U, 34V, 34W are disposed radially between the stator core 20 and the rotor 50 (i.e., dimensional difference Δd). Therefore, the radial space between the stator core 20 and the rotor 50 can be effectively utilized as a space for disposing the multiple connection rings 34U, 34V, 34W.

[0063] Furthermore, the multiple connection rings 34U, 34V, 34W are arranged side by side in the axial direction of the stator 10. This prevents the multiple connection rings 34U, 34V, 34W from protruding in the radial direction, thereby preventing the size of the stator 10 from increasing in size in the radial direction.

[0064] Furthermore, the end portion 34A on one axial side of the connecting ring 34W, which is arranged furthest on one axial side of the stator 10 among the multiple connecting rings 34U, 34V, and 34W, is located on the other axial side of the stator 10 relative to the ends 26A on one axial side of the multiple winding portions 26. Therefore, the end portion 34A on one axial side of the connecting ring 34W can be prevented from protruding from the ends 26A on one axial side of the multiple winding portions 26. This prevents the size of the stator 10 from becoming large in the axial direction.

[0065] Furthermore, the other axial end 34B of the connecting ring 34U, which is arranged furthest to the other axial end of the stator 10 among the multiple connecting rings 34U, 34V, 34W, is located closer to one axial end of the stator 10 than the other axial end 26B of the multiple winding portions 26. Therefore, the other axial end 34B of the connecting ring 34U can be prevented from protruding from the other axial end 26B of the multiple winding portions 26. This prevents the size of the stator 10 from becoming large in the axial direction.

[0066] Furthermore, the multiple connecting rings 34U, 34V, 34W are all arranged at one axial end of the stator 10. Therefore, connecting rings 34U, 34V, 34W are not arranged at the other axial end of the stator 10, which simplifies the configuration of the other axial end of the stator 10.

[0067] Furthermore, the plurality of windings 16U, 16V, 16W have a plurality of crossover wires 28U, 28V, 28W that connect the plurality of winding portions 26U, 26V, 26W, and the plurality of crossover wires 28U, 28V, 28W are routed radially outside the plurality of connecting rings 34U, 34V, 34W. Therefore, when the plurality of stator components 12U, 12V, 12W are assembled, it is possible to prevent the plurality of crossover wires 28U, 28V, 28W from interfering with the plurality of connecting rings 34U, 34V, 34W. This improves the workability when assembling the plurality of stator components 12U, 12V, 12W.

[0068] Furthermore, crossover wire 28U provided in U-phase stator component 12U is wired at a position that is not at a position where it will interfere with core components 14V, 14W when stator components 12V, 12W are assembled to stator component 12U from the axial direction of stator 10. Therefore, when stator components 12V, 12W are assembled to stator component 12U from the axial direction of stator 10, it is possible to avoid crossover wire 28U interfering with core components 14V, 14W. This improves workability when assembling multiple stator components 12U, 12V, 12W.

[0069] Furthermore, crossover wire 28V provided in V-phase stator component 12V is wired at a position that is not at a position where it will interfere with core component 14W when stator component 12W is assembled to stator components 12U and 12V from the axial direction of stator 10. Therefore, when stator component 12W is assembled to stator components 12U and 12V from the axial direction of stator 10, it is possible to avoid crossover wire 28V interfering with core component 14W. This improves workability when assembling multiple stator components 12U, 12V, and 12W.

[0070] Each crossover wire 28 is shaped from a state in which it spreads out toward the radially outer side of the stator component 12 to a state in which it spreads out toward the radially inner side of the stator component 12. Therefore, each crossover wire 28 can be gathered together in the radially inner part of the stator component 12.

[0071] Next, a modified example of one embodiment of the present invention will be described.

[0072] In the above embodiment, the multiple connecting rings 34U, 34V, and 34W are all arranged at one axial end of the stator 10, but the multiple connecting rings 34U, 34V, and 34W may also be arranged as follows.

[0073] For example, in the example shown in Fig. 16, connection rings 34V and 34W are arranged at one axial end of stator 10, and connection ring 34U is arranged at the other axial end of stator 10. In this case, connection rings 34V and 34W are an example of a "first connection ring," and connection ring 34U is an example of a "second connection ring." In the example shown in Fig. 16, multiple connection rings 34U, 34V, and 34W are arranged separately at one axial end and one axial end of stator 10, thereby enabling the configurations of the one axial end and the other axial end of stator 10 to be simplified in a balanced manner.

[0074] Although not specifically shown, connection ring 34W may be arranged at one axial end of stator 10, and connection rings 34U and 34V may be arranged at the other axial end of stator 10. In this case, connection ring 34W is an example of a "first connection ring," and connection rings 34U and 34V are an example of a "second connection ring." Even in this case, multiple connection rings 34U, 34V, and 34W are arranged separately at one axial end and one axial end of stator 10, thereby simplifying the configuration of the one axial end and the other axial end of stator 10 in a balanced manner.

[0075] Furthermore, when the connecting ring 34U is disposed at the end on the other axial side of the stator 10, the end 34B on the other axial side of the connecting ring 34U may be located closer to one axial side of the stator 10 than the ends 26B on the other axial sides of the multiple winding portions 26. In this case as well, the end 34B on the other axial side of the connecting ring 34U can be prevented from protruding beyond the ends 26B on the other axial sides of the multiple winding portions 26. This prevents the size of the stator 10 from becoming larger in the axial direction.

[0076] Furthermore, in the above embodiment, the multiple connection rings 34U, 34V, 34W are arranged side by side in the axial direction of the stator 10, but one connection ring 34 of the multiple connection rings 34U, 34V, 34W may be shifted in the radial direction of the stator 10 relative to the other connection rings 34. In other words, the inner diameters and outer diameters of the multiple connection rings 34U, 34V, 34W may be different.

[0077] For example, in the example shown in FIG. 17, the connection ring 34W is disposed radially outward of the stator 10 relative to the connection rings 34U and 34V.

[0078] 16 or 17, a portion of the connection ring 34U in the axial direction may overlap a portion of the stator core 20 in the axial direction. That is, a portion of the connection ring 34U in the axial direction may be inserted into a gap (i.e., a radial gap) between the stator core 20 and the rotor 50.

[0079] 16 or 17, a portion of the connection ring 34V in the axial direction may overlap a portion of the stator core 20 in the axial direction. That is, a portion of the connection ring 34V in the axial direction may be inserted into a gap (i.e., a radial gap) between the stator core 20 and the rotor 50.

[0080] Furthermore, in the above embodiment, the crossover wires 28U, 28V, and 28W are shaped from a state in which they extend radially outward from the stator components 12U, 12V, and 12W toward the radially inward of the stator components 12U, 12V, and 12W, but they do not have to be shaped.

[0081] In addition, in the above embodiment, stator 10 is configured to be assembled in the order of stator components 12U, 12V, and 12W, but the assembly order of multiple stator components 12U, 12V, and 12W may be other than the above. That is, in Figures 4A to 4C, stator component 12U may be configured as stator component 12V or stator component 12W, stator component 12V may be configured as stator component 12U or stator component 12W, and stator component 12W may be configured as stator component 12U or stator component 12V.

[0082] Furthermore, in the above embodiment, the brushless motor 60 is, as an example, an 8-pole, 12-slot brushless motor, but other combinations of the number of magnetic poles and the number of slots may be used.

[0083] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0084] 10... stator, 12U, 12V, 12W... stator component, 14U, 14V, 14W... core component, 16U, 16V, 16W... winding, 18U, 18V, 18W... insulator, 20... stator core, 22... yoke component, 22U, 22V, 22W... yoke component, 24U, 24V, 24W... teeth portion, 26U, 26V, 26W... winding portion, 28U, 28V, 28W... jumper wire, 30U, 30V, 30W... terminal portion, 32U, 32V, 32W... insulating portion, 34U, 34V, 34W... connecting ring, 36U, 36V, 36W... guide groove, 40... yoke, 50... rotor, 52... rotor shaft, 54... rotor body, 60... brushless motor

Claims

1. a stator; a rotor disposed inside the stator; Equipped with The stator includes: a stator core configured by a plurality of core components each having a plurality of yoke components that form an annular yoke and are divided in the circumferential direction of the yoke, and a plurality of teeth that protrude from each of the yoke components in the radial direction of the yoke; a plurality of windings each having a plurality of winding portions wound around each of the teeth; a plurality of insulators attached to the core constituent portions, each insulating the teeth portion from the winding portion, and each having a plurality of insulating portions and a plurality of connecting rings connecting the plurality of insulating portions; Equipped with The inner diameter of each of the connecting rings is set to a dimension larger than the outer diameter of the rotor, The outer diameter of each of the connecting rings is set to be smaller than the inner diameter of the stator core. Brushless motor.

2. A stator, a rotor disposed inside the stator; Equipped with The stator includes: a stator core configured by a plurality of core components each having a plurality of yoke components that form an annular yoke and are divided in the circumferential direction of the yoke, and a plurality of teeth that protrude from each of the yoke components in the radial direction of the yoke; a plurality of windings each having a plurality of winding portions wound around each of the teeth; a plurality of insulators attached to the core constituent portions, each insulating the teeth portion from the winding portion, and each having a plurality of insulating portions and a plurality of connecting rings connecting the plurality of insulating portions; Equipped with The inner diameter of each of the connecting rings is set to a dimension larger than the outer diameter of the rotor, the plurality of connecting rings are disposed radially between the stator core and the rotor. Brushless motor.

3. The plurality of connecting rings are arranged side by side in the axial direction of the stator, 3. The brushless motor according to claim 1 or 2.

4. The end portion of the first connecting ring, which is arranged furthest to one axial side of the stator among the plurality of connecting rings, is located on the other axial side of the stator than the ends of the plurality of winding portions on the one axial side. The brushless motor according to any one of claims 1 to 3.

5. The end portion on the other axial side of the second connecting ring, which is arranged furthest from the other axial side of the stator among the plurality of connecting rings, is located on the one axial side of the stator further than the end portions on the other axial side of the plurality of winding portions.

5. The brushless motor according to claim 4.

6. The plurality of connecting rings are all arranged at one end of the axial direction of the stator.

6. The brushless motor according to claim 4 or 5.

7. The first connecting ring is disposed at one end of the stator in the axial direction, The second connecting ring is disposed at the other axial end of the stator.

6. The brushless motor according to claim 5.

8. The plurality of windings have a plurality of jumper wires connecting the plurality of winding portions, The plurality of crossover wires are wired radially outward of the plurality of connection rings. The brushless motor according to any one of claims 1 to 7.

9. The plurality of core components, the plurality of windings, and the plurality of insulators are It constitutes the data component, the plurality of stator components are assembled to one another in the axial direction of the stator, the crossover wire provided in one stator component among the plurality of stator components is wired at a position away from a position where it interferes with the core component provided in another stator component among the plurality of stator components when the plurality of stator components are assembled together in the axial direction of the stator.

9. The brushless motor according to claim 8.

10. Each of the crossover wires is shaped from a state in which it extends radially outward of the stator component to a state in which it extends radially inward of the stator component.

10. The brushless motor according to claim 9.

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