Busbar Unit

Abstract

To provide a busbar unit capable of miniaturizing a motor.SOLUTION: A busbar unit 20 is provided on a motor 1 having a winding on a phase basis and comprises a ring-shaped busbar holder 21, a housing part 22 which is provided on the ring-shaped busbar holder 21 at intervals in the circumferential direction and extends along the axial direction of the motor 1, and first, second, and third busbars 30a, 30b, and 30c which are provided for each phase of the motor 1 and at least part of which is housed in the housing part 22. The first, second, and third busbars 30a, 30b, and 30c have a winding connection 34 which is formed on one end and connected with the winding, an external connection 31 which is formed on another end and connected with the exterior of the motor 1, and an intermediate part 33 which is formed between the one end and the other end extends along the axial direction of the motor 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a busbar unit. [Background technology]

[0002] Known examples of conventional busbar units for motors include the busbar unit described in Patent Document 1. The busbar unit for motors described in Patent Document 1 has U-phase, V-phase, and W-phase busbars connected to the U-phase, V-phase, and W-phase coils of the motor, respectively. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-219335 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the busbar unit of the motor described in Patent Document 1, the U-phase, V-phase, and W-phase busbars are formed to extend circumferentially around the motor from the U-phase, V-phase, and W-phase coils to connector portions that protrude to the side of the motor, which poses a problem that the busbars occupy a large space in the motor, preventing the motor from being made smaller.

[0005] The present invention has been made to solve such problems, and has an object to provide a busbar unit that enables a motor to be made smaller. [Means for solving the problem]

[0006] In order to solve the above problems, a busbar unit according to the present invention is provided in a rotating electric machine having windings for each phase, and includes: an annular busbar holder; accommodating portions that are circumferentially spaced apart on the annular busbar holder and extend along the axial direction of the rotating electric machine; and busbars that are provided for each phase of the rotating electric machine and at least partially accommodated in the accommodating portions, the busbars having a winding connection portion formed at one end and connected to the winding, an external connection portion formed at the other end and connected to the outside of the rotating electric machine, and an intermediate portion formed between the one end and the other end and extending along the axial direction of the rotating electric machine. The winding connection portion has an insertion portion connected to the external connection portion and facing the intermediate portion, the intermediate portion extending perpendicularly to the external connection portion, the winding connection portion extending parallel to the external connection portion, the accommodating portion having a pair of side wall portions extending along the axial direction of the rotating electric machine, a pair of support portions spaced apart from the side wall portions and extending along the axial direction of the rotating electric machine, a gap portion provided between the side wall portions and the support portions, and a bent portion provided at one end of the support portion, the external connection portion being supported by the other end of the support portion, and the intermediate portion and the insertion portion being supported by the bent portions. .

[0007] Also, at least two bus bars may be provided, and at least two of the bus bars may have the same shape. The annular bus bar holder may also include a winding holding portion formed along the circumferential direction and configured to hold the winding connected to the winding connection portion. The intermediate portion of the bus bar may be plate-shaped. The intermediate portion of the bus bar may be columnar. The winding connection portion of the bus bar may have a hook-shaped portion. [Effects of the Invention]

[0008] According to the busbar unit of the present invention, the busbar provided in the rotating electric machine has a winding connection portion formed at one end and connected to the winding, an external connection portion formed at the other end and connected to the outside of the rotating electric machine, and an intermediate portion formed between the one end and the other end and extending along the axial direction of the rotating electric machine, thereby making it possible to miniaturize the motor. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a motor according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view of a busbar unit according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of the storage section shown in FIG. 2. [Figure 4]FIG. 3 is a perspective view of the first to third bus bars shown in FIG. [Figure 5] FIG. 10 is a perspective view of a busbar unit according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a perspective view of the storage section shown in FIG. 5. [Figure 7] FIG. 6 is a perspective view of the first to third bus bars shown in FIG. [Figure 8] FIG. 10 is a perspective view of first to third bus bars according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view of an annular bus bar holder according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 A motor according to a first embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a perspective view of a motor according to the first embodiment. Motor 1, which constitutes a rotating electric machine, has a ring-shaped end plate 12 with a rotating shaft 11 protruding from the center of the upper part, and a cylindrical motor case 13 with end plate 12 attached to one end. End plate 12 constitutes the upper end of motor 1. Motor 1 also has three phases.

[0011] On the upper side of the end plate 12, the upper parts of the external connection parts 31 provided on the upper parts of the first bus bar 30a, the second bus bar 30b, and the third bus bar 30c, which will be described in detail later, and the upper part of the accommodating part 22 protrude through through holes formed in the end plate 12.

[0012] 2 is a perspective view of a busbar unit according to the first embodiment of the present invention. Busbar unit 20 is provided directly below end plate 12 of motor 1 (see FIG. 1). Busbar unit 20 has an annular busbar holder 21 made of resin. Three accommodating portions 22 are formed around the inner diameter portion 28a of annular busbar holder 21 at intervals in the circumferential direction, protruding upward along the axial direction of rotating shaft 11 of motor 1. Each accommodating portion 22 accommodates a first busbar 30a, a second busbar 30b, and a third busbar 30c, respectively. The first busbar 30a is connected to a U-phase stator coil (not shown) housed inside the motor case 13 on the lower side of the busbar unit 20, the second busbar 30b is connected to a V-phase stator coil (not shown) housed inside the motor case 13 on the lower side of the busbar unit 20, and the third busbar 30c is connected to a W-phase stator coil (not shown) housed inside the motor case 13 on the lower side of the busbar unit 20.

[0013] A horizontal portion 28b extending horizontally radially outward is provided at the lower end of the inner diameter portion 28a of the annular bus bar holder 21. An outer diameter portion 28c extending upward along the axial direction is provided at the radially outermost portion of the horizontal portion. The inner diameter portion 28a, the horizontal portion 28b, and the outer diameter portion 28c form an annular groove 23 that is open at the top. A plurality of slits 24 extending along the axial direction are provided at intervals in the circumferential direction in the outer diameter portion 28c of the annular groove 23. The annular groove 23 forms a winding holding portion.

[0014] 3 is a perspective view showing the accommodating portion 22 shown in FIG. 2. The accommodating portion 22 has two side wall portions 25 that protrude radially outward from the inner diameter portion 28a of the annular busbar holder 21 and extend along the axial direction, and two support portions 26 that are spaced apart from each side wall portion 25 and protrude radially outward and extend along the axial direction. A gap 27 is formed between the side wall portions 25 and the support portions 26. The support portions 26 have an upper end portion 26a and a bent portion 26b at their lower end portion that is bent toward the side wall portions 25. Note that while FIG. 3 shows only one of the accommodating portions 22 of the busbar unit 20, the other accommodating portions 22 have the same shape.

[0015] 4 is a perspective view of the first, second, and third bus bars 30a, 30b, and 30c shown in FIG. 2. The first, second, and third bus bars 30a, 30b, and 30c are formed from bent copper plates. The first, second, and third bus bars 30a, 30b, and 30c each have an external connection portion 31 formed at the top and extending horizontally. The external connection portion 31 has a female screw hole 32 formed therein. The first, second, and third bus bars 30a, 30b, and 30c each have an insertion portion 35 extending perpendicular to the external connection portion 31, an intermediate portion 33 facing the insertion portion 35 and extending perpendicular to the external connection portion 31, and a winding connection portion 34 extending horizontally from the lower end of the intermediate portion 33. In this embodiment, the first, second, and third bus bars 30a, 30b, and 30c are formed from copper plates, but they may also be formed from other materials, such as aluminum alloy plates, as long as they are plate-shaped conductors.

[0016] 2, in the busbar unit 20, the insertion portions 35 (see FIG. 4) and intermediate portions 33 of the first, second, and third busbars 30a, 30b, and 30c are inserted into the gaps 27 (see FIG. 3) of the respective accommodating portions 22, the lower ends of the insertion portions 35 and intermediate portions 33 are supported by the respective bent portions 26b, and the external connection portions 31 are supported by the respective upper end portions 26a, thereby accommodating the first, second, and third busbars 30a, 30b, and 30c in the respective accommodating portions 22 of the annular busbar holder 21. The intermediate portions 33 extend along the axial direction of the motor 1, and the external connection portions 31 and the winding connection portions 34 extend perpendicular to the axial direction of the motor 1. Furthermore, as a method for manufacturing the busbar unit 20 by accommodating the first, second, and third busbars 30a, 30b, and 30c in the respective accommodating portions 22 of the annular busbar holder 21, any method can be used, such as a method of integrally molding the busbar unit 20 in which the first, second, and third busbars 30a, 30b, and 30c are accommodated in the respective accommodating portions 22, or a method of inserting and assembling the first, second, and third busbars 30a, 30b, and 30c into the respective accommodating portions 22 of a pre-formed annular busbar holder 21.

[0017] The first, second, and third bus bars 30a, 30b, and 30c housed in each housing portion 22 are connected by unillustrated conductors screwed into female threaded holes 32 formed in the external connection portion 31 to electrical circuits external to the motor 1 (see FIG. 1), such as a control board for controlling the motor 1 and a rotation sensor for detecting the rotation of the motor 1. Furthermore, stator windings (not shown) provided for each phase of the motor 1 are joined by soldering or the like to the winding connection portions 34 of the first, second, and third bus bars 30a, 30b, and 30c housed in each housing portion 22. Furthermore, the stator windings (not shown) are housed and held in the annular groove portion 23, pass through the slit portion 24, and are wound around a stator core (not shown) inside the motor 1. In other words, the first, second, and third bus bars 30a, 30b, and 30c are bus bars that connect electrical circuits external to the motor 1 with the stator windings inside the motor 1.

[0018] In the invention according to the first embodiment, the first, second, and third bus bars 30a, 30b, and 30c have the same shape, making them possible to standardize. Furthermore, the first, second, and third bus bars 30a, 30b, and 30c have simpler shapes compared to the bus bars of the prior art, making it possible to reduce the number of parts and molds for the motor 1 and the manufacturing man-hours for the motor 1, thereby reducing the manufacturing costs of the motor 1.

[0019] Furthermore, in the invention according to the first embodiment, the external connection portions 31 and the winding connection portions 34 of the first, second, and third bus bars 30a, 30b, and 30c are integrally formed, and intermediate portions 33 between the external connection portions 31 and the winding connection portions 34 extend along the axial direction of the motor 1. Therefore, compared to bus bars of the prior art that have intermediate portions that extend along the circumferential direction of the motor so as not to come into contact with each other, the first, second, and third bus bars 30a, 30b, and 30c have shorter intermediate portions 33, reducing the space occupied by the bus bars and enabling the motor 1 to be made more compact.

[0020] Furthermore, in the invention according to the first embodiment, in the busbar unit 20, the first, second, and third busbars 30a, 30b, and 30c are accommodated in the respective accommodating portions 22 of the annular busbar holder 21, which makes it possible to reduce the size of the busbar unit 20. Furthermore, in the busbar unit 20, the first, second, and third busbars 30a, 30b, and 30c are integrally molded with the annular busbar holder 21, which makes it possible to easily assemble the motor 1.

[0021] In this way, the busbar unit according to the first embodiment is a busbar unit 20 provided in a motor 1 having a winding for each phase, and includes an annular busbar holder 21, accommodating portions 22 that are circumferentially spaced apart on the annular busbar holder 21 and extend along the axial direction of the motor 1, and first, second, and third busbars 30a, 30b, and 30c that are provided for each phase of the motor 1 and at least a portion of which is accommodated in the accommodating portion 22. The first, second, and third busbars 30a, 30b, and 30c each have a winding connection portion 34 formed at one end and connected to the winding, an external connection portion 31 formed at the other end and connected to the outside of the motor 1, and an intermediate portion 33 formed between the one end and the other end and extending along the axial direction of the motor 1, thereby enabling the motor to be made smaller.

[0022] Furthermore, since the motor 1 includes three bus bars, ie, the first, second and third bus bars 30a, 30b and 30c, and the first, second and third bus bars 30a, 30b and 30c have the same shape, the manufacturing cost of the motor 1 can be reduced.

[0023] In addition, the annular busbar holder 21 is formed along the circumferential direction and has an annular groove portion 23 that holds the winding connected to the winding connection portion 34, making it easy to route the winding and facilitating the manufacture of the motor 1.

[0024] Furthermore, since the intermediate portions 33 of the first, second, and third bus bars 30a, 30b, and 30c are plate-shaped, the first, second, and third bus bars 30a, 30b, and 30c can be formed inexpensively and lightweight by bending.

[0025] Embodiment 2 Next, a busbar unit according to a second embodiment of the present invention will be described with reference to the accompanying drawings. In the following embodiments, the same reference numerals as those in Figs. 1 to 4 of the first embodiment denote the same or similar components, and detailed description thereof will be omitted. The busbar unit according to the second embodiment is different from the first embodiment in that the shapes of the busbar unit and busbars are modified.

[0026] 5 is a perspective view of busbar unit 20a according to Embodiment 2. Cylindrical housing portions 22a extending along the axial direction of motor 1 (see FIG. 1) are arranged around inner diameter portion 28a of busbar unit 20a at intervals in the circumferential direction. First busbar 40a, second busbar 40b, and third busbar 40c are housed in housing portions 22a.

[0027] FIG. 6 is a perspective view of the accommodation portion 22a shown in FIG. 5. The accommodation portion 22a has two side walls 25 that protrude radially outward from the inner diameter portion 28a of the annular bus bar holder 21 and extend along the axial direction. Each side wall 25 is connected to an inner wall 25b that extends along the axial direction on the radially inner side. The accommodation portion 22a also has an outer wall 25a that extends along the axial direction on the radially outer side and partially faces the inner wall 25b. The outer wall 25a has curved surfaces at its ends and is connected to each side wall 25 via the curved surfaces. The accommodation portion 22a is cylindrically formed by the outer wall 25a, the inner wall 25b, and the side walls 25, and has an inner wall 25c on its inside. Note that FIG. 6 shows only one of the accommodation portions 22a, but the other accommodation portions 22a have the same shape.

[0028] FIG. 7 is a perspective view of the first to third bus bars shown in FIG. 5. The first, second, and third bus bars 40a, 40b, and 40c are formed into a columnar shape by cutting copper material. The first, second, and third bus bars 40a, 40b, and 40c each have an external connection portion 41 formed at the top and extending horizontally. A female screw hole 42 is formed in the external connection portion 41. The first, second, and third bus bars 40a, 40b, and 40c each have a columnar intermediate portion 43 extending downward from the external connection portion 41 and a winding connection portion 44 formed at the bottom end and protruding horizontally. The outer peripheries of the intermediate portions 43 of the first, second, and third bus bars 40a, 40b, and 40c are formed to be able to fit into the inner wall portion 25c of each accommodation portion 22a of the annular bus bar holder 21b (see FIG. 6). In the second embodiment, the first, second and third bus bars 40a, 40b and 40c are formed by cutting copper material, but they may be formed by cutting other types of conductors such as aluminum alloys, or may be formed by any method such as casting.

[0029] Referring again to Figure 5, in the busbar unit 20a, the middle portions 43 of the first, second and third busbars 40a, 40b and 40c are inserted into the respective accommodating portions 22a of the annular busbar holder 21a, so that the first, second and third busbars 40a, 40b and 40c are accommodated in the respective accommodating portions 22a. The busbar unit 20a can be manufactured by accommodating the first, second, and third busbars 40a, 40b, and 40c in the respective accommodating portions 22a of the annular busbar holder 21a using any method, such as a method of integrally molding the busbar unit 20a in which the first, second, and third busbars 40a, 40b, and 40c are accommodated in the respective accommodating portions 22a of the annular busbar holder 21a, or a method of inserting and assembling the first, second, and third busbars 40a, 40b, and 40c into the respective accommodating portions 22a of a preformed annular busbar holder 21a. The remaining configuration is the same as that of the first embodiment.

[0030] The busbar unit 20a according to the second embodiment has the same effects as the busbar unit 20 according to the first embodiment, and in addition, since the first, second and third busbars 40a, 40b and 40c are formed by cutting, the strength of the first, second and third busbars 40a, 40b and 40c can be improved.

[0031] In this way, since the intermediate portions 43 of the first, second and third bus bars 40a, 40b and 40c are columnar, the strength of the first, second and third bus bars 40a, 40b and 40c can be improved.

[0032] Embodiment 3 Next, a busbar unit according to a third embodiment of the present invention will be described with reference to the accompanying drawings. The busbar unit according to the third embodiment is different from the busbar unit according to the first embodiment in that the shape of the busbar is changed.

[0033] FIG. 8 is a perspective view of first to third bus bars according to the third embodiment. The first, second, and third bus bars 50a, 50b, and 50c are formed by bending copper plates. The first, second, and third bus bars 50a, 50b, and 50c each have an external connection portion 51 formed at the top and extending horizontally. A female screw hole 52 is formed in the external connection portion 51. The first, second, and third bus bars 50a, 50b, and 50c each have an intermediate portion 53 extending downward from the external connection portion 51 and a winding connection portion 54 formed below the intermediate portion 53 and protruding horizontally. The winding connection portion 54 protrudes radially outward from the bus bar unit 20 (see FIG. 2) and forms a hook-shaped portion that opens radially inward. The other configurations are the same as those in the first embodiment.

[0034] In this way, since the winding connection portions 54 of the first, second, and third bus bars 50a, 50b, and 50c have hook-shaped portions, the stator windings can be easily connected to the winding connection portions 54.

[0035] In the present embodiment, first, second, and third bus bars 50a, 50b, and 50c are formed by bending copper plates, but they may be formed by bending other types of conductors, such as aluminum alloy plates. Also, as long as winding connection portion 54 forms a hook-shaped portion, intermediate portion 53 may be a columnar member (see FIG. 7) as in the second embodiment.

[0036] Embodiment 4 Next, a busbar unit according to a fourth embodiment of the present invention will be described with reference to the accompanying drawings. The busbar unit according to the fourth embodiment is different from the busbar unit according to the second embodiment in that the shape of the annular busbar holder is changed. In the fourth embodiment, the same reference numerals as those in Figures 5 to 7 of the second embodiment indicate the same or similar components, and detailed description thereof will be omitted. The annular bus bar holder 21b has an annular edge portion 23b connected to the inner diameter portion 28a and extending horizontally. The annular edge portion 23b is characterized in that it does not have an outer diameter portion 28c that defines the shape of the annular groove portion 23 (see FIG. 2) of the second embodiment. The other configurations are the same as those of the second embodiment.

[0037] In this way, by having the annular edge portion 23b in the annular bus bar holder 21b, the annular bus bar holder 21b can hold the windings with a simpler configuration.

[0038] The configuration of the annular busbar holder 21b having the annular edge portion 23b according to the fourth embodiment of the present invention can be used in appropriate combination with the accommodating portion 22 of the annular busbar holder 21 according to the first embodiment of the present invention.

[0039] Furthermore, in the first to fourth embodiments of the present invention, the motor 1 is a three-phase motor, and is provided with three first, second and third bus bars 30a, 30b and 30c and three accommodating sections 22 and 22a, but this is not limited to this, and the number of phases of the motor, the number of bus bars and the number of accommodating sections may be changed as needed. [Industrial Applicability]

[0040] According to the busbar unit of the first embodiment, a busbar unit 20 is provided in a motor 1 having a winding for each phase, and includes an annular busbar holder 21, accommodation portions 22 that are provided circumferentially on the annular busbar holder 21 at intervals and extend along the axial direction of the motor 1, and first, second, and third busbars 30a, 30b, and 30c that are provided for each phase of the motor 1 and at least a portion of which is accommodated in the accommodation portion 22. The first, second, and third busbars 30a, 30b, and 30c each have a winding connection portion 34 formed at one end and connected to the winding, an external connection portion 31 formed at the other end and connected to the outside of the motor 1, and an intermediate portion 33 formed between the one end and the other end and extending along the axial direction of the motor 1. This enables the length of the busbar to be shortened, making the busbar suitable for use in small motors. [Explanation of symbols]

[0041] 20 Busbar unit 21 Annular busbar holder 21a Annular busbar holder 21b Annular bus bar holder 22 Storage section 22a Storage section 23 Annular groove (winding holding portion) 23b Annular edge portion (winding holding portion) 30a 1st bus bar 30b Second bus bar 30c 3rd busbar 31 External connection part 33 Middle section 34 Winding connection 40a 1st bus bar 40b Second bus bar 40c 3rd busbar 41 External connection part 43 Middle section 44 Winding connection 50a 1st bus bar 50b Second bus bar 50c 3rd busbar 51 External connection part 53 Middle section 54 Winding connection

Claims

1. A busbar unit (20) provided in a rotating electric machine (1) having a winding for each phase, An annular busbar holder (21); a housing portion (22) provided at intervals in the circumferential direction of the annular bus bar holder (21) and extending along the axial direction of the rotating electric machine (1); bus bars (30a, 30b, 30c) provided for each of the phases of the rotating electric machine (1), at least a portion of which is accommodated in the accommodation portion (22); Equipped with The bus bars (30a, 30b, 30c) are a winding connection portion (34) formed at one end and connected to the winding; an external connection portion (31) formed at the other end and connected to the outside of the rotating electric machine (1); an intermediate portion (33) formed between the one end portion and the other end portion and extending along the axial direction of the rotating electric machine (1); an insertion portion (35) connected to the external connection portion (31) and facing the intermediate portion (33); and The intermediate portion (33) extends perpendicular to the external connection portion (31), and the winding connection portion (34) extends parallel to the external connection portion (31); The storage section (22) is a pair of side wall portions (25) extending along the axial direction of the rotating electric machine (1); a pair of support portions (26) spaced apart from the side wall portions (25) and extending along the axial direction of the rotating electric machine (1); a gap (27) provided between the side wall portion (25) and the support portion (26); A bending portion (26b) is provided at one end of the support portion (26), The external connection portion (31) is supported by the other end of the support portion (26), The busbar unit, wherein the intermediate portion (33) and the insertion portion (35) are supported by the bent portion (26b).

2. 2. The busbar unit according to claim 1, comprising at least two busbars (30a, 30b, 30c), each of which has the same shape.

3. 3. The busbar unit according to claim 1, wherein the annular busbar holder (21) includes a winding holding portion (23) formed along a circumferential direction and holding the winding connected to the winding connection portion (34).

4. 3. The busbar unit according to claim 1, wherein the intermediate portions (33) of the busbars (30a, 30b, 30c) are plate-shaped.

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