JP2009124927A - Bus bar device and brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bus bar device which has a width reduced in a diameter direction while suppressing deterioration in moldability and heat resistance. <P>SOLUTION: The bus bar device 11 is configured so that a bus bar holder 12 houses four bus bars 13-16. The bus bars 13-16 are respectively provided with arc-like portions 13a-16a each formed by bending a strip-like conductive plate in a longitudinal direction so that a plate thickness direction may match a diameter direction, and a plurality of coil connection portions 15b which are formed by bending the conductive plate so as to protrude in the outside of a diameter direction from the arc-like portions 13a-16a and be opened in the inside of the diameter direction and has a coil end connected thereto. The bus bar holder 12 is annularly formed of an insulative composite resin material and has bus bars 13-16 arranged on both ends on its axial direction, and houses a plurality of arc-like portions 13a-16a so that the arc-like portions 13a-16a may be formed coaxially and arranged so as to be spaced apart in the axial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bus bar device having a bus bar for short-circuiting corresponding ends of a plurality of coils provided in a brushless motor, and a brushless motor including the bus bar device.

Conventionally, a brushless motor includes a bus bar device having a bus bar for short-circuiting corresponding ends of a plurality of coils arranged in the circumferential direction and supplying a current supplied from an external power supply device to each coil. There is something. For example, the bus bar holder of the bus bar device described in Patent Document 1 has an annular shape, and arc-shaped accommodation grooves that open in the axial direction and extend in the circumferential direction are arranged in the radial direction on one end face in the axial direction. As shown in FIG. The bus bar housed in each housing groove is composed of a long strip-shaped conductor curved in an arc shape and a plurality of connection terminals formed at one end of the strip conductor in the short direction. Yes. Each connection terminal is bent outward in the radial direction with respect to the belt-like conductor, and a concave portion opened outward in the radial direction in which the end of the coil is disposed is formed at the tip. Each bus bar is housed in the housing groove so that the plate thickness direction of the strip-shaped conductor matches the radial direction of the bus bar holder. Thus, by arranging the plurality of bus bars with respect to the bus bar holder so that the plate thickness direction and the radial direction of the bus bar body coincide with each other, the bus bar device can be downsized in the radial direction, and thus the bus bar device. The brushless motor provided with can be reduced in size in the radial direction.
JP 2002-171708 A

  By the way, when trying to further reduce the radial width of the bus bar device described in Patent Document 1 for further miniaturization of the brushless motor, the interval between the housing grooves arranged in the radial direction in the bus bar holder is narrowed in the radial direction. It is possible to do. However, when the interval between the accommodation grooves is reduced in the radial direction, the thickness of the wall-shaped part separating the adjacent grooves in the radial direction in the bus bar holder is reduced in the radial direction, so that the strength of the bus bar holder is reduced, When the bus bar holder is formed of an insulating synthetic resin material, it is difficult to mold the bus bar holder. Furthermore, if the spacing between the receiving grooves is reduced in the radial direction, the interval between the strip-like conductors of the bus bars adjacent in the radial direction is reduced. Therefore, considering the heat generation of the bus bar during energization, the current density in the bus bar is reduced. Some ideas may be required. For these reasons, there is a limit in reducing the radial width of the bus bar device by narrowing the interval between the accommodating grooves arranged in the radial direction in the radial direction.

  In order to further reduce the thickness of the bus bar device described in Patent Document 1 in the radial direction, it is conceivable to reduce the thickness of the strip-shaped conductor. However, when the plate thickness of the strip conductor is reduced, the cross-sectional area in the direction orthogonal to the longitudinal direction of the strip conductor is reduced. Therefore, considering the current density during energization, it is difficult to simply reduce the thickness of the strip conductor.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bus bar device capable of reducing the width in the radial direction while suppressing a decrease in moldability and heat resistance, and the bus bar device. It is to provide a brushless motor.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an arc-shaped portion formed by bending a strip-shaped conductive plate material in a longitudinal direction so that a plate thickness direction coincides with a radial direction, and a radial direction from the arc-shaped portion. A plurality of bus bars each having a plurality of connecting portions to which the end portions of the coils are connected by bending the conductive plate so as to protrude outward and radially inward, and ring-shaped with an insulating synthetic resin material And the bus bars are arranged at both ends in the axial direction, and the arc-shaped portions of the bus bars are arranged coaxially and spaced apart in the axial direction. The gist of the present invention is that the bus bar device includes the accommodated bus bar holder.

  According to this configuration, the plurality of bus bars are arranged so that the arc-shaped portions are coaxial and are arranged apart from each other in the axial direction. Therefore, the arc-shaped portions of the plurality of bus bars do not overlap in the radial direction. In addition, the arcuate portion is axially bent by, for example, equalizing the curvature of the arc of the busbar arcuate portion disposed at one end of the busbar holder in the axial direction and the arcuate portion of the busbar disposed at the other end in the axial direction. It can be configured to overlap each other in the direction. Therefore, it is possible to reduce the width of the bus bar holder in the radial direction (the same direction as the radial direction of the arc-shaped portion) compared to the case where the arc-shaped portions of all the bus bars are stacked in the radial direction as in the past. As a result, the radial width of the bus bar device can be reduced. In addition, since the plurality of arc-shaped portions of the bus bar are not arranged so as to overlap with each other in the radial direction, the inner peripheral side and the outer periphery of the arc-shaped portion in the bus bar holder can be obtained without increasing the radial width of the bus bar holder. It is possible to increase the thickness of the side portion. Furthermore, when the circumferentially extending accommodating groove for accommodating the arc-shaped portion is formed in the bus bar holder, the radial width of the accommodating groove is conventionally increased without increasing the radial width of the bus bar holder. It can be made larger. From these things, it becomes possible to make the width | variety of the radial direction of a bus-bar apparatus small, suppressing the fall of the moldability and heat resistance of a bus-bar holder. In addition, since the arc-shaped portions of the plurality of bus bars are not stacked in the radial direction, the radial cross-sectional area of the arc-shaped portions accommodated in the bus bar holder is constant while reducing the radial width of the bus bar holder. It is possible to increase the plate thickness (that is, the radial width) of the arc-shaped portion while maintaining the thickness. If it does in this way, the enlargement of the axial direction of a bus-bar apparatus will be suppressed.

  According to a second aspect of the present invention, in the bus bar device according to the first aspect, each of the bus bars is formed into a plate shape by crushing a wire having a cross-sectional shape that is conductive and plastically deformable in the radial direction of the wire. The gist is that it is formed by bending a plurality of portions in the longitudinal direction of one molded conductive material.

  According to this configuration, each bus bar is formed of one conductive material that is formed into a plate shape by crushing a wire having a circular cross section in the radial direction. Therefore, the yield of the bus bar can be increased and the manufacturing cost can be reduced. In addition, the force applied to the conductive material when the conductive material is bent to form the arc-shaped portion and the force applied to the conductive material when the conductive material is bent to form the connection portion are both conductive materials. This is the force in the direction along the plate thickness direction. Therefore, it is possible to easily process the conductive material for forming the bus bar.

  According to a third aspect of the present invention, in the bus bar device according to the first or second aspect, the bus bar holder has a cylindrical shape and accommodates the arc-shaped portion of the bus bar at both axial end portions thereof. And the arc-shaped portions of at least a pair of the bus bars among the plurality of bus bars have the same curvature of each other arc and are respectively accommodated in both axial end portions of the accommodating portion. .

  According to this configuration, at least the arc-shaped portions of the pair of bus bars have the same curvature of the arc, and are disposed at both ends in the axial direction of the housing portion. When two arc-shaped portions having the same curvature of the arc are arranged coaxially, they overlap in the axial direction. Therefore, the radial width of the accommodating portion that accommodates the arc-shaped portion of the bus bar can be reduced, and the radial width of the bus bar device can be further reduced.

  According to a fourth aspect of the present invention, in the bus bar device according to any one of the first to third aspects, the bus bar holder includes an accommodating groove that opens in the axial direction and extends in the circumferential direction, and the accommodating groove. A step-like recess formed by recessing the opening of the outer side in the radial direction or the inner side in the radial direction, and the arc bar is axially adjacent to the bus bar accommodated in the accommodation groove. The gist is that at least a part of the arc-shaped portion is accommodated in the step-shaped recess.

  According to this configuration, one bus bar that is axially adjacent to the bus bar in which the arc-shaped portion is accommodated in the accommodating groove has at least a part of the arc-shaped portion that is radially outward or radially extending from the opening of the accommodating groove. It arrange | positions in the step-shaped recessed part formed concavely inside. Therefore, for example, compared to the case where two housing grooves are formed in the radial direction so as to accommodate the arcuate portions of these two bus bars, a wall between the housing grooves adjacent in the radial direction is not required. The width can be made smaller.

  According to a fifth aspect of the present invention, in the bus bar device according to any one of the first to fourth aspects, the bus bar holder penetrates the bus bar holder in the axial direction and is axially connected to the connecting portion. The gist is that a plurality of guide holes are provided to guide the end portions of the coils that are opposed and inserted to the connection portion.

  According to the same configuration, when the end of the coil is connected to the connection portion of the bus bar, when the end of the coil is inserted into the guide hole from the opening of the guide hole opposite to the side where the connection portion is disposed, The end of the guide is guided into the connecting portion by passing through the guide hole. Therefore, the connection portion and the end portion of the coil can be easily connected. In addition, since the end of the coil is kept in a state of passing through the guide hole formed in the bus bar holder, the coil to the parts (brushless motor housing case, etc.) arranged around the bus bar device by the bus bar holder Interference at the end of the is suppressed.

  The invention according to claim 6 is the bus bar device according to any one of claims 1 to 5, wherein the bus bar holder includes at least one wall surface extending in the circumferential direction and parallel to the axial direction. The gist of the arc-shaped portion of at least one of the bus bars is that the wall is pressed in the radial direction by the elastic force of the arc-shaped portion.

  According to this configuration, the arc-shaped portion is pressed against at least one wall surface extending in the circumferential direction and parallel to the axial direction provided in the bus bar holder, thereby preventing the bus bar having the arc-shaped portion from falling off the bus bar holder. Is done. Further, since the bus bar having the arc-shaped portion pressed against the wall surface of the bus bar holder is restrained from moving with respect to the bus bar holder, the end of the coil can be easily connected to the connection portion of the bus bar.

  The invention according to claim 7 is the bus bar device according to any one of claims 1 to 6, wherein three power supply bus bars respectively corresponding to the U phase, the V phase, and the W phase, and a neutral point The bus bar holder is arranged such that two bus bars are disposed at both ends in the axial direction of the bus bar holder.

  According to this configuration, since the four bus bars provided in the bus bar device are arranged two on each side of the bus bar holder in the axial direction, the width in the radial direction is reduced in the bus bar device provided with the four bus bars. Easy to do.

  According to an eighth aspect of the present invention, in the bus bar device according to the seventh aspect, the three power supply bus bars extend from the arcuate portion toward the outside in the radial direction and supply power for each phase. The gist of the invention is that each is provided with a terminal connection portion to which is connected, and is arranged continuously in the axial direction.

  According to this configuration, since the three power supply bus bars are arranged so as to be continuously arranged in the axial direction, it is easy to align the axial positions of the portions to which the three power supply terminals are connected in the bus bar device. In addition, since the arcuate portion of the common bus bar serving as a neutral point is disposed over almost the entire region in the circumferential direction, the arc shape of each power supply bus bar can be obtained by disposing it at a position not between the power supply bus bars. This makes it easy to prevent contact between the terminal connecting portion extending radially outward from the portion and the common bus bar.

  According to a ninth aspect of the present invention, there is provided a cylindrical housing case having a bottom, an annular stator having a plurality of the coils fixed to an inner peripheral surface of the housing case and arranged in the circumferential direction, and the fixing A rotor having a rotating shaft supported by annular bearings disposed on both sides in the axial direction of the child and disposed inside the stator; and an annular sensor rotor fixed to the rotating shaft And a resolver composed of an annular sensor stator disposed to face the sensor rotor in a radial direction, and disposed on an outer peripheral side of one of the bearings or an outer peripheral side of the resolver. The gist of the invention is a brassless motor including the bus bar device according to any one of claims 8.

  According to this configuration, either one of the bearings or the resolver is disposed on the inner peripheral side of the bus bar device having a reduced radial width. Therefore, it is possible to reduce the axial size of the brushless motor.

  ADVANTAGE OF THE INVENTION According to this invention, the brush-bar motor provided with the bus-bar apparatus which can make the width | variety of radial direction small can be provided, suppressing the fall of a moldability and heat resistance, and this bus-bar apparatus can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
Fig.1 (a) shows sectional drawing of the brushless motor of this embodiment. This brushless motor is used, for example, as a drive source for an electric power steering device (not shown). As shown in FIG. 1A, an annular bearing 2a is provided at the center of the upper bottom portion of the bottomed cylindrical housing case 1, and the opening of the housing case 1 has a substantially disc shape. The end frame 3 is fixed by screwing the screws 4. A cylindrical support portion 3a is formed at the center of the end frame 3 in the radial direction so as to protrude toward the inside of the housing case 1, and the inner peripheral surface of the tip opening of the support portion 3a is provided with the bearing. An annular bearing 2b that is paired with 2a is fixed.

  A stator 5 is press-fitted and fixed to the inner peripheral surface of the housing case 1. As shown in FIG. 2, the stator core 6 of the stator 5 is formed in an annular shape by connecting twelve divided cores 6 a having a T shape when viewed in the axial direction in the circumferential direction. Each divided core 6a is composed of a connecting portion 6b having an arc shape when viewed from the axial direction, and a tooth 6c extending radially inward from the circumferential center of the connecting portion 6b, and the connecting portion 6b. An engaging groove 6d extending along the axial direction is formed in the center portion in the circumferential direction of the outer peripheral surface of the outer peripheral surface.

  Each split core 6a is mounted with an insulator 7 covering both end faces in the axial direction and both side faces in the circumferential direction of each split core 6a from both sides in the axial direction. At both ends in the radial direction of each insulator 7 made of an insulating synthetic resin material, a prevention wall 7a standing in the axial direction is formed. Moreover, as shown in FIG.1 (c), in each insulator 7, the end surface coating | coated part 7b which coat | covers the lower end surface of the teeth 6c is recessedly provided in the radial direction outer side edge part toward radial inner side. An engaging recess 7c is formed.

  As shown in FIG. 2, coils U <b> 1 to U <b> 4, V <b> 1 to V <b> 4, and W <b> 1 to W <b> 4 are wound around the teeth 6 c by winding the conductive wire 8 from above the insulator 7. The prevention walls 7a prevent the coils U1 to U4, V1 to V4, and W1 to W4 from protruding outward and radially inward. Further, as shown in FIGS. 1A and 2, one end of each of the coils U1 to U4, V1 to V4, W1 to W4, that is, the twelve connecting end portions 8a are equiangularly spaced in the circumferential direction. It is pulled out in the axial direction from the position. FIG. 1A shows only the coils U2 and U3 among the 12 coils U1 to U4, V1 to V4, and W1 to W4.

  As shown in FIG. 1A, a bus bar device 11 is disposed at one end of the stator 5 in the axial direction, that is, at the end of the stator 5 on the end frame 3 side. As shown in FIGS. 3 and 4, the bus bar device 11 includes a bus bar holder 12 formed of an insulating synthetic resin material, and four bus bars 13 to 16 held by the bus bar holder 12. ing.

  As shown in FIG. 6, the bus bar holder 12 includes a cylindrical accommodating portion 21 provided at a substantially central portion of the bus bar holder 12 and a substantially fan-shaped 3 extending from the accommodating portion 21 toward the outer peripheral side. The two fixing auxiliary portions 22a to 22c and the extended holding portion 23 extended from the leftmost fixing auxiliary portion 22a in the radial direction outward in FIG. 6 are integrally formed. The outer diameter of the portion excluding the extended holding portion 23 in the bus bar holder 12 is formed to be substantially equal to the outer diameter of the stator core 6 (see FIG. 1), and the inner diameter of the accommodating portion 21 is the same as that of the end frame 3. It is formed larger than the outer diameter of the support portion 3a (see FIG. 1).

  One snap fit engagement portion 25 for attaching the bus bar holder 12 to the stator 5 is formed on the outer peripheral edge of each of the fixing auxiliary portions 22a to 22c. The three snap-fit engagement portions 25 are formed at equiangular intervals in the circumferential direction on the outer peripheral edge of the bus bar holder 12 excluding the extended holding portion 23. And as shown to Fig.5 (a), while the snap fit engaging part 25 is extended to the upper direction in Fig.5 (a) along an axial direction, it is radial inside (container 21 side) in the front-end | tip part. A locking portion 25a is integrally provided. The proximal end portion of the snap fit engagement portion 25 can be elastically deformed in the radial direction.

  Moreover, as shown in FIG. 6, the contact part 26 is each standingly arranged by the outer periphery of each fixing auxiliary | assistant part 22a-22c. These contact portions 26 are formed at three locations that are central portions in the circumferential direction between the snap fit engagement portions 25 adjacent in the circumferential direction. And as shown to Fig.5 (a), each contact part 26 is the axial direction contact part 26a extended upwards in FIG.5 (a) along the axial direction from the outer periphery of each fixing auxiliary | assistance part 22a-22c. And a radial contact portion 26b extending upward along the axial direction from the tip end portion of the axial contact portion 26a. The axial contact portion 26a has a substantially rectangular plate shape and is curved along the outer peripheral surface of each of the fixing auxiliary portions 22a to 22c, and the tip surface thereof is a flat surface orthogonal to the axial direction. . Further, the radial contact portion 26b is formed such that its circumferential width can be inserted into an engagement groove 6d (see FIG. 2) formed in the stator core 6.

  Further, each of the fixing auxiliary portions 22a to 22c is formed with a guide hole 24 penetrating in the axial direction at a portion near the outer periphery. In the present embodiment, the guide hole 24 has a circular shape when viewed from the axial direction, and three guide holes 24 are formed in the fixed auxiliary portions 22a and 22b, and two are formed in the fixed auxiliary portion 22c. When the bus bar holder 12 is fixed to the stator 5, the guide holes 24 have diameters of the connection end portions 8 a (see FIG. 2) of the coils U 1, U 3, V 1, V 3, W 2, and W 4 that face each other in the axial direction. It is formed according to the position in the direction and the circumferential direction. The diameter of each guide hole 24 is set to a size that allows the conductor 8 to be inserted.

  In addition, a circle that opens in the axial direction and extends in the circumferential direction at the end on the side closer to the stator 5 (that is, the end on the front side in FIG. 6) of the both ends in the axial direction of the accommodating portion 21. A first installation portion 31 having an arcuate groove shape is formed. The first installation portion 31 extends in the housing portion 21 along the circumferential direction from the lower end in FIG. 6 of the fixing auxiliary portion 22a to the substantially central portion in the circumferential direction between the fixing auxiliary portions 22b and 22a in the counterclockwise direction. The shape seen from the direction is an arc shape centered on the central axis L <b> 1 of the accommodating portion 21. Moreover, the terminal opening part 31a opened to a radial direction outer side is formed in the both ends of the circumferential direction of the 1st installation part 31, respectively.

  As shown in FIG. 3, the V-phase bus bar 13 is disposed in the first installation portion 31. The V-phase bus bar 13 includes an arc-shaped arc-shaped portion 13a disposed in the first installation portion 31, coil connection portions 13b provided at both ends in the circumferential direction of the arc-shaped portion 13a, and a circumference of the arc-shaped portion 13a. It is comprised from the terminal connection part 13c extended linearly from the one end part of a direction to the extended holding | maintenance part 23 side.

  As shown in FIG. 5B, the arcuate portion 13 a is formed thinner in the radial direction than in the axial direction, and the first installation portion 31 so that the plate thickness direction coincides with the radial direction of the accommodating portion 21. Is housed inside. The first installation portion 31 is formed sufficiently deeper than the width in the short direction (that is, the height in the axial direction) of the arc-shaped portion 13 a, and the arc-shaped portion 13 a contacts the bottom surface of the first installation portion 31. It is inserted in the first installation portion 31 in the axial direction until it comes into contact. Further, the arc-shaped portion 13a is a circle having a curvature slightly smaller than the curvature of the outer peripheral side inner wall surface 31b on the outer peripheral side of the inner peripheral surface of the first installation portion 31 in a state before being installed in the first installation portion 31. It is formed in an arc shape, and when it is inserted into the first installation portion 31, it is pressed against the outer peripheral side inner wall surface 31b by an elastic force.

  Further, as shown in FIG. 3, the two coil connecting portions 13 b are U-shaped with the shape viewed from the axial direction opening radially inward, and are provided on both sides in the circumferential direction of the first installation portion 31. The terminal opening 31a protrudes to the outer peripheral side of the accommodating portion 21. Each coil connection portion 13b is formed so that the circumferential width of the portion excluding the arc-shaped portion at the tip is substantially constant, and the tip end portion on the radially outer side of each coil connection portion 13b is the fixing auxiliary portion 22a. It is arrange | positioned in the radial inside rather than the outer periphery of ~ 22c. Further, the terminal connecting portion 13c extends along the lower side surface in FIG. 3 of the fixing auxiliary portion 22a from the circumferential end portion of the arcuate portion 13a closer to the extending holding portion 23. A portion on the distal end side of the terminal connection portion 13c is accommodated in a support groove 32 formed in the extended holding portion 23, and a V-phase terminal plate made of a conductive plate material is disposed on the distal end portion of the terminal connection portion 13c. 33 is connected. A V-phase power supply terminal Tv is connected to the V-phase bus bar 13 via the V-phase terminal plate 33.

  As shown in FIG. 6, the second installation portion 34 is recessed on the outer peripheral side of the first installation portion 31 in the housing portion 21. From the vicinity of the end in the circumferential direction on the fixing auxiliary portion 22b side of the lower fixing auxiliary portion 22c in FIG. 6 at the end of the housing portion 21 on the side where the first installation portion 31 is formed. It is formed along the circumferential direction in the counterclockwise direction to the vicinity of the end of the fixing auxiliary portion 22a on the fixing auxiliary portion 22b side, and the shape seen from the axial direction is an arc shape centering on the central axis L1 of the accommodating portion 21. There is no. In the second installation portion 34, a portion adjacent to the first installation portion 31 in the radial direction is a stepped recess 34 a that is continuously provided radially outward from the axial opening of the first installation portion 31. In addition, the first installation portion 31 has a shape in which the axial opening is recessed toward the outside in the radial direction. Further, a portion of the second installation portion 34 closer to the fixing auxiliary portion 22a than the stepped recess 34a has a groove shape that opens in the axial direction and extends in the circumferential direction, and in the fixing auxiliary portion 22a and the extended holding portion 23. It is connected to a support groove 35 extending substantially linearly. And the terminal opening part 34b opened to a radial direction outer side is formed in the both ends of the circumferential direction of the 2nd installation part 34, respectively.

  As shown in FIG. 3, the W-phase bus bar 14 is disposed in the second installation portion 34. The W-phase bus bar 14 includes an arc-shaped arc portion 14a disposed in an arc-shaped portion of the second installation portion 34, and the coil connection portions 13b provided at both ends in the circumferential direction of the arc-shaped portion 14a. A similar coil connection portion 14b and a terminal connection portion 14c that linearly extends from one end portion in the circumferential direction of the arc-shaped portion 14a to the extended holding portion 23 side.

  As shown in FIG. 5 (b), the arc-shaped portion 14a of the W-phase bus bar 14 is formed thinner in the radial direction than the axial direction, like the arc-shaped portion 13a of the V-phase bus bar 13, and its thickness direction Is accommodated in the second installation portion 34 so as to coincide with the radial direction of the accommodating portion 21. And the arcuate part 14a accommodated in the 2nd installation part 34 does not protrude in the axial direction from the end surface of the axial direction by the side of the stator 5 in the accommodating part 21. As shown in FIG. Further, as shown in FIG. 3, the arcuate portion 14 a has a slightly smaller curvature than the curvature of the outer peripheral side inner wall surface 34 c on the outer peripheral side of the second installation portion 34 in a state before being installed in the second installation portion 34. When inserted into the second installation portion 34, it is pressed against the outer peripheral inner wall surface 34c by elastic force. And as shown in FIG. 3, the two said coil connection parts 14b protrude in the outer peripheral side of the accommodating part 21 from the said terminal opening part 34b, respectively. The terminal connecting portion 14c extends substantially linearly from the circumferential end of the arcuate portion 14a on the fixing auxiliary portion 22a side toward the extending holding portion 23. The fixing auxiliary portion 22a and the extending holding portion It is accommodated in the support groove 35 formed in the portion 23. A W-phase terminal plate 36 made of a conductive plate is connected to the tip of the terminal connection portion 14c, and a W-phase power supply terminal Tw is connected to the W-phase bus bar 14 via the W-phase terminal plate 36. Connected.

  As shown in FIG. 7, at both ends of the housing portion 21 in the axial direction, the end opposite to the stator 5 (the front side in FIG. 7) opens in the axial direction and has an arcuate groove shape. A third installation portion 41 is formed. The third installation portion 41 is arranged around the housing portion 21 from a position facing the central portion in the longitudinal direction (vertical direction in FIG. 7) of the extended holding portion 23 in a radial direction to a position advanced about 180 ° in the clockwise direction. It extends along the direction and has an arc shape centered on the central axis L <b> 1 of the accommodating portion 21. Further, the third installation portion 41 is formed in an arc shape having the same curvature as the first installation portion 31, and the third installation portion 41 and the first installation portion 31 have the same radial position and are in the axial direction. They overlap (see FIG. 5 (a)). And the terminal opening part 41a opened to a radial direction outer side is formed in the both ends of the circumferential direction of the 3rd installation part 41, respectively.

  As shown in FIG. 4, the U-phase bus bar 15 is arranged in the third installation portion 41. The U-phase bus bar 15 includes a circular arc-shaped portion 15a accommodated in the third installation portion 41, and a coil connection portion similar to the coil connection portion 13b provided at both ends in the circumferential direction of the arc-shaped portion 15a. 15b and a terminal connection portion 15c extending linearly from one end portion in the circumferential direction of the arc-shaped portion 15a to the extending holding portion 23 side.

  As shown in FIG. 5 (b), the arcuate portion 15a of the U-phase bus bar 15 is formed to be thinner in the radial direction than the axial direction, like the arc-shaped portion 13a of the V-phase bus bar 13, and its thickness direction Is accommodated in the third installation part 41 so as to coincide with the radial direction of the accommodating part 21. The third installation part 41 is formed sufficiently deeper than the axial width of the arcuate part 15a, and the arcuate part 15a is in the third installation part 41 until it contacts the bottom surface of the third installation part 41. Is inserted in the axial direction. As shown in FIG. 4, the arcuate portion 15 a has a curvature of the outer peripheral side inner wall surface 41 b on the outer peripheral side of the inner peripheral surface of the third installation portion 41 in a state before being installed in the third installation portion 41. It is formed in an arc shape with a slightly smaller curvature, and when it is inserted into the third installation portion 41, it is pressed against the outer peripheral inner wall surface 41b by elastic force. Further, the arc-shaped portion 15 a has an arc shape with the same curvature as the arc-shaped portion 13 a of the V-phase bus bar 13 accommodated in the first installation portion 31, and overlaps the arc-shaped portion 13 a in the axial direction. And the two said coil connection parts 15b protrude in the outer peripheral side of the accommodating part 21 from the said terminal opening part 41a, respectively. The terminal connection portion 15c is accommodated in a support groove 42 that is linearly formed from the terminal opening 41a that opens toward the fixing auxiliary portion 22a to the fixing auxiliary portion 22a and the extended holding portion 23. . A U-phase terminal plate 43 made of a conductive plate is connected to the tip of the terminal connection portion 15c, and a U-phase power supply terminal Tu is connected to the U-phase bus bar 15 via the U-phase terminal plate 43. Connected.

  Further, as shown in FIG. 7, of the both ends in the axial direction of the accommodating portion 21, the end opposite to the stator 5 (the front side in FIG. 7) is on the outer peripheral side of the third installation portion 41. A fourth installation portion 44 is recessed. The fourth installation portion 44 is a circumferential end portion on the fixing auxiliary portion 22a side of the fixing auxiliary portion 22b in the clockwise direction from the vicinity of the circumferential end portion on the fixing auxiliary portion 22b side of the fixing auxiliary portion 22a. It is formed along the circumferential direction to the vicinity, and the shape seen from the axial direction is an arc shape centering on the central axis L <b> 1 of the accommodating portion 21. The portion of the fourth installation portion 44 that is adjacent to the third installation portion 41 in the radial direction is a stepped recess 44 a that is provided continuously from the axial opening of the third installation portion 41 to the outside in the radial direction. The third opening 41 has a shape in which the opening in the axial direction is recessed toward the outside in the radial direction. On the other hand, in the fourth installation portion 44, a portion that is not adjacent to the third installation portion 41 in the radial direction (that is, a portion other than the stepped recess 44a) has a groove shape that opens in the axial direction and extends in the circumferential direction. Further, the fourth installation portion 44 is formed in an arc shape having the same curvature as the second installation portion 34, and the fourth installation portion 44 and the second installation portion 34 have the same radial position and are in the axial direction. They overlap (see FIG. 5 (a)). And the terminal opening part 44b opened to radial direction outer side is formed in six places of the circumferential direction of the 4th installation part 44, respectively. 6 and 7, a total of twelve terminal openings 31a, 34b, 41a, 44b formed in the bus bar holder 12 are equiangularly spaced in the circumferential direction.

  As shown in FIG. 4, the common bus bar 16 serving as a neutral point is disposed in the fourth installation portion 44. The common bus bar 16 includes an arc-shaped arc portion 16a disposed in the fourth installation portion 44, and a coil connection portion 16b similar to the coil connection portion 13b provided at six locations in the circumferential direction of the arc-shaped portion 16a. It is composed of As shown in FIG. 5 (b), the arc-shaped portion 16a of the common bus bar 16 is formed to be thinner in the radial direction than the axial direction, like the V-phase arc-shaped portion 13a. 21 is accommodated in the fourth installation portion 44 so as to coincide with the radial direction of 21. And the arc-shaped part 16a accommodated in the 4th installation part 44 does not protrude in the axial direction from the end surface of the axial direction on the opposite side to the stator 5 in the accommodating part 21. As shown in FIG. As shown in FIG. 4, the arc-shaped portion 16 a has a slightly smaller curvature than the curvature of the outer peripheral side inner wall surface 44 c on the outer peripheral side of the fourth installation portion 44 in a state before being installed in the second installation portion 34. When inserted into the fourth installation portion 44, it is brought into pressure contact with the outer peripheral side inner wall surface 44c. The six coil connecting portions 16b protrude from the terminal opening 44b to the outer peripheral side of the accommodating portion 21, respectively.

  And as shown to Fig.5 (a), four bus-bars 13-16 arrange | positioned with respect to the bus-bar holder 12 are spaced apart in the axial direction so that the four arc-shaped parts 13a-16a may become coaxial. Are lined up. In addition, a total of twelve coil connection portions 13b to 16b are arranged at equiangular intervals in the circumferential direction, and openings that open radially inward are in the first to fourth installation portions 31, 34, 41, and 44. Respectively. Further, the coil connection portion 16b of the U-phase bus bar 15 and the coil connection portion 16b of the common bus bar 16 have one end portion in the axial direction of the guide hole 24 (the opening portion on the opposite side to the stator 5). ) In the axial direction, and the connection end portion 8a of the coil that has passed through the guide hole 24 is guided into the coil connection portions 15b and 16b, respectively.

  Each of the bus bars 13 to 16 is formed of a wire S1 having a circular cross section that is conductive and plastically deformable as shown in FIG. More specifically, the wire S1 is crushed by applying force from both sides in the radial direction to form a plate-like conductive material S2 having a substantially rectangular cross-sectional shape. Then, one conductive material S2 is curved in the longitudinal direction so that the plate thickness direction of the conductive material S2 coincides with the radial direction to form the arc-shaped portion 13a, and protrudes radially outward from the arc-shaped portion 13a. The bus bar 13 is formed by bending the conductive material S2 in a U shape so as to open radially inward to form the coil connection portion 13b. Similarly, the bus bars 14 to 16 are formed by bending and bending a plurality of portions in the longitudinal direction of one conductive material S2 in the longitudinal direction.

  As shown in FIG. 1A and FIG. 1C, the bus bar device 11 configured as described above is provided with the locking portion 25 a of the snap-fit engagement portion 25 on the insulator 7 of the stator 5. By being engaged with the engaging recess 7c in the axial direction, it is fixed to the stator 5. In a state where the bus bar holder 12 is fixed to the end of the stator 5 in the axial direction, the central axis L1 of the accommodating portion 21 coincides with the axis of the stator 5, and the bus bar device 11 is fixed to the support portion 3a. It is arranged on the outer peripheral side of the bearing 2a. In the same state, the V-phase bus bar 13 and the W-phase bus bar 14 are disposed at the axial end of the bus bar holder 12 on the stator 5 side, and the axial end of the bus bar holder 12 opposite to the stator 5 is disposed. The U-phase bus bar 15 and the common bus bar 16 are arranged in the part. Further, in this state, as shown in FIG. 1B, the radial contact portion 26b of the contact portion 26 is inserted into the engagement groove 6d of the stator core 6 and the radial contact portion. 26b contacts the bottom surface of the engaging groove 6d. Further, the tip end surface of the axial contact portion 26 a of the contact portion 26 contacts the axial end surface of the stator core 6. And the movement with respect to the stator 5 of the bus-bar holder 12 is controlled by the axial direction contact part 26a and the radial direction contact part 26b.

  As shown in FIGS. 2 and 4, among the connection end portions 8a of the coils U1 to U4, V1 to V4 and W1 to W4, the coils U1, U3, V1, which are connected to the U-phase bus bar 15 and the common bus bar 16. The connection ends 8a of V3, W2 and W4 are guided to the coil connection portions 15b and 16b by passing through the guide holes 24, and inserted into the coil connection portions 15b and 16b (inside the U-shaped portion). And then electrically connected by welding. On the other hand, the connection end portions 8a of the coils U2, U4, V2, V4, W1, W3 connected to the V-phase bus bar 13 and the W-phase bus bar 14 are respectively electrically connected by welding after being inserted into the coil connection portions 13b, 15b. Connected. Thereby, as shown in FIG. 9, predetermined connection end part 8a is short-circuited by the bus-bars 13-16 among the connection end parts 8a of the coils U1-U4, V1-V4, W1-W4.

  As shown in FIG. 1A, a rotor 51 is rotatably accommodated inside the stator 5. A rotor yoke 54 having a plurality of permanent magnets 53 fixed to its outer peripheral surface is fixed to a rotating shaft 52 of a rotor 51 that is pivotally supported by the pair of bearings 2a and 2b. These permanent magnets 53 are opposed to the stator core 6 in the radial direction. Further, the distal end of the rotating shaft 52 passes through the bus bar device 11 and the support portion 3 a of the end frame 3 and protrudes outside the housing case 1. A sensor rotor 55 is fixed to a portion of the rotating shaft 52 in the support portion 3a, and a sensor stator 56 is provided on the inner peripheral surface of the support portion 3a so as to face the sensor rotor 55 in the radial direction. It is fixed. The sensor rotor 55 and the sensor stator 56 constitute a resolver 57. The resolver 57 is for detecting the rotation state (rotation position, rotation speed, etc.) of the rotor 51 with respect to the stator 5, and a position detection signal corresponding to the rotation state of the rotor 51 is provided outside the brushless motor. Output to a driving circuit (not shown).

  In the brushless motor configured as described above, when the rotor 51 is rotated by energizing predetermined coils U1 to U4, V1 to V4, W1 to W4, the sensor rotor 55 rotates together with the rotating shaft 52. Then, the resolver 57 outputs a rotation detection signal corresponding to the rotation state of the sensor rotor 55, that is, the rotation state of the rotor 51, to a drive circuit (not shown). The drive circuit energizes the coils U1 to U4, V1 to V4, and W1 to W4 based on the input rotation detection signal.

As described above, the present embodiment has the following effects.
(1) Since the four bus bars 13 to 16 are arranged so that the arc-shaped portions 13a to 16a are coaxial and spaced apart in the axial direction, the arc-shaped portions of the plurality of bus bars overlap in the radial direction. Don't be. Further, since the four bus bars 13 to 16 are respectively disposed at both ends in the axial direction of the bus bar holder 12, the arc-shaped portion 13a of the bus bar 13 disposed at one end in the axial direction of the bus bar holder 12 and the other in the axial direction. It is possible to arrange the arcuate portions 13a and 15a so as to overlap each other in the axial direction by equalizing the curvature of the arc with the arcuate portion 15a of the bus bar 15 arranged at the end. The same applies to the bus bar 14 disposed at one end of the bus bar holder 12 in the axial direction and the bus bar 16 disposed at the other end in the axial direction. Therefore, the width of the bus bar holder 12 in the radial direction (the same direction as the radial direction of the arc-shaped portion) can be reduced as compared with the case where the arc-shaped portions of all the bus bars are stacked in the radial direction as in the prior art. As a result, the radial width of the bus bar device 11 can be reduced. In addition, since the plurality of arc-shaped portions 13a to 16a of the bus bars 13 to 16 are not arranged so as to overlap with each other in the radial direction, the bus bar holder 12 does not have a larger width in the radial direction than the conventional one. It is possible to increase the thickness of the portions on the inner peripheral side and the outer peripheral side of the arc-shaped portions 13a to 16a. Furthermore, the radial width of the first and third installation portions 31 and 41 extending in the circumferential direction for accommodating the arc-shaped portions 13a to 16a without increasing the radial width of the bus bar holder 12 as compared with the conventional one. It can be made larger than in the past. From these things, the width of the radial direction of bus bar device 11 can be made small, suppressing the fall of the moldability and heat resistance of bus bar holder 12. Further, since the arc-shaped portions 13a to 16a of the four bus bars 13 to 16 are not stacked and arranged in the radial direction, the arc-shaped portions accommodated in the bus bar holder 12 while reducing the radial width of the bus bar holder 12 It is possible to increase the plate thickness (that is, the radial width) of the arcuate portions 13a to 16a while keeping the radial cross-sectional areas of 13a to 16a constant. If it does in this way, the enlargement of the axial direction of the bus-bar apparatus 11 will be suppressed.

  (2) Each of the bus bars 13 to 16 is formed of one conductive material S2 that is formed into a plate shape by crushing the wire S1 having a circular cross section in the radial direction. Therefore, the yield of the bus bars 13 to 16 can be increased, and the manufacturing cost can be reduced. Further, the force applied to the conductive material S2 when the conductive material S2 is bent to form the arc-shaped portions 13a to 16a and the conductive material when the conductive material S2 is bent to form the coil connection portions 13b to 16b. The force applied to S2 is a force in a direction along the thickness direction of the conductive material S2. Therefore, the processing of the conductive material S2 for forming the bus bars 13 to 16 can be easily performed.

  (3) The arc-shaped portion 13a of the V-phase bus bar 13 and the arc-shaped portion 15a of the U-phase bus bar 15 have the same curvature of the arc, and are arranged coaxially at both ends in the axial direction of the housing portion 21. . Similarly, the arc-shaped portion 14a of the W-phase bus bar 14 and the arc-shaped portion 16a of the common bus bar 16 have the same curvature of the arc, and are disposed so as to be coaxial with each other in the axial direction of the accommodating portion 21. And the arc-shaped part 13a and the arc-shaped part 15a with the same curvature of an arc, and the arc-shaped part 14a and the arc-shaped part 16a are arrange | positioned coaxially, and have overlapped with the axial direction. Therefore, the radial width of the accommodating portion 21 that accommodates the arc-shaped portions 13a to 16a of the bus bars 13 to 16 can be reduced, and the radial width of the bus bar device 11 can be further reduced.

  (4) One W-phase bus bar 14 that is axially adjacent to the V-phase bus bar 13 in which the arc-shaped portion 13a is accommodated in the groove-shaped first installation portion 31 has a part of the arc-shaped portion 14a in the first installation. The opening part of the axial direction of the part 31 is arrange | positioned in the step-shaped recessed part 34a formed by denting radially outside. Further, the U-phase bus bar 15 in which the arc-shaped portion 15 a is accommodated in the groove-shaped third installation portion 41 and the one common bus bar 16 adjacent in the axial direction have a part of the arc-shaped portion 16 a in the third installation portion 41. Is housed in a stepped recess 44a formed by recessing the axial opening on the outside in the radial direction. Therefore, for example, in order to accommodate the two arc-shaped portions 13a and 14a of the V-phase bus bar 13 and the W-phase bus bar 14 (or the two arc-shaped portions 15a and 16a of the U-phase bus bar 15 and the common bus bar 16), Compared with the case where two such groove-shaped installation portions are formed in the radial direction, a wall between the grooves adjacent in the radial direction is not required, and thus the radial width of the bus bar holder 12 can be further reduced. .

  (5) When connecting the connection ends 8a of the coils U1, U3, V1, V3, W2, and W4 to the coil connection portions 15b and 16b of the U-phase bus bar 15 and the common bus bar 16, the coil connection portions 15b and 16b are arranged. When the connection end portion 8a of the coils U1, U3, V1, V3, W2, and W4 is inserted into the guide hole 24 from the opening portion of the guide hole 24 on the opposite side, the connection end portion 8a passes through the guide hole 24. Thus, the guide holes 24 are guided into the coil connecting portions 15b and 16b, respectively. Therefore, the coil connection portions 15b and 16b and the connection end portions 8a of the coils U1, U3, V1, V3, W2, and W4 can be easily connected. Further, since the connection end 8a of the coils U1, U3, V1, V3, W2, and W4 is maintained in a state of passing through the guide hole 24 formed in the bus bar holder 12, the bus bar holder 12 causes the bus bar device 11 to Interference of the connecting end portion 8a with components (such as the brushless motor housing case 1) disposed around is suppressed.

  (6) The arc-shaped portions 13a to 16a of the respective bus bars 13 to 16 are pressed against the outer peripheral side inner wall surfaces 31b, 34c, 41b and 44c provided in the bus bar holder 12 in the radial direction by the elastic force. Accordingly, the dropout of the bus bars 13 to 16 from the bus bar holder 12 is suppressed. Moreover, since the bus bars 13-16 which have the arc-shaped parts 13a-16a press-contacted to the outer peripheral side inner wall surfaces 31b, 34c, 41b, 44c are restrained from moving with respect to the bus bar holder 12, the coil connecting parts of these bus bars 13-16 The connection ends 8a of the coils U1 to U4, V1 to V4, and W1 to W4 can be easily connected to 13b to 16b.

  (7) Since the four bus bars 13 to 16 included in the bus bar device 11 are arranged on both sides in the axial direction of the accommodating portion 21, two bus bars 13 to 16 are provided in the bus bar device 11 including the four bus bars 13 to 16, respectively. It is easy to reduce the radial width.

  (8) The V-phase bus bar 13, the W-phase bus bar 14, and the U-phase bus bar 15 to which the power supply terminals Tv, Tw, Tu are connected are arranged so as to be continuously arranged in the axial direction. 13c-15c will be arrange | positioned in the position close | similar to an axial direction. Accordingly, in the bus bar device 11, the portions to which the three power supply terminals Tv, Tw, Tu are connected (the power supply terminals Tv, Tw, Tu in the V-phase terminal plate 33, the W-phase terminal plate 36, and the U-phase terminal plate 43 are connected). To be aligned in the axial direction. Further, the common bus bar 16 serving as a neutral point has its arcuate portion 16a disposed over almost the entire area in the circumferential direction, so that the bus bars 13 to 15 to which the power supply terminals Tv, Tw, Tu are connected, respectively. By disposing at a position that is not between them, it is easy to prevent contact between the terminal connection portions 13c to 15c extending from the arc-shaped portions 13a to 15a of the respective bus bars 13 to 15 toward the radially outer side and the common bus bar 16.

  (9) For example, when the bus bar device 11 is disposed between the stator 5 and the bearing 2a in the housing case 1, an empty space is generated on the outer peripheral side of the bearing 2a. Therefore, by disposing the bearing 2a on the inner peripheral side of the bus bar device 11 having a reduced radial width as in the present embodiment, the empty space on the outer peripheral side of the bearing 2a is effectively used to make the brushless motor It is possible to reduce the axial size.

  (10) For example, when connecting the connection end portion 8a of the coils U1 to U4, V1 to V4, W1 to W4 to the connection portion having a recess opening radially outward, the connection end portion 8a moves in the radial direction. Since the connection end 8a goes out of the recess, it may be difficult to weld the connection end to the connection end 8a. The coil connection portions 13 b to 16 b of the present embodiment have a U shape that opens radially inward, and the base end portions (opening portions) are first to fourth installation portions that are recessed in the housing portion 21. 31, 34, 41, 44. Therefore, the connection end portion 8a inserted into the coil connection portions 13b to 16b is prevented from coming out of the coil connection portions 13b to 16b from the coil connection portions 13b to 16b to the radially outer side and both sides in the circumferential direction. The accommodating portion 21 prevents the coil connecting portions 13b to 16b from coming out radially inward. As a result, each coil connection part 13b-16b and the connection end part 8a can be welded easily.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the brushless motor includes the resolver 57 for detecting the rotation state of the rotor 51, but the sensor for detecting the rotation state of the rotor 51 is not limited to this. For example, the rotation state of the rotor 51 may be detected using a permanent magnet that rotates integrally with the rotating shaft 52 and a Hall IC that is disposed on the permanent magnet.

  In the above embodiment, the bus bar device 11 is arranged on the outer peripheral side of the bearing 2a. However, the resolver 57 may be a component arranged in the internal space of the bus bar device 11 formed by further reducing the radial width of the bus bar device 11. Moreover, when arrange | positioning the bus-bar apparatus 11 in the upper-bottom part side of the housing case 1, if it arrange | positions in the outer peripheral side of the bearing 2a, the effect similar to (9) of the said embodiment can be acquired.

  In the above-described embodiment, the bus bar device 11 is configured such that the V-phase bus bar 13, the W-phase bus bar 14, and the U-phase bus bar 15 to which the power supply terminals Tv, Tw, and Tu are connected are continuously arranged in the axial direction. ing. However, the four bus bars 13 to 16 included in the bus bar device 11 may be arranged in the axial direction in any order.

  In the above-described embodiment, a total of four bus bars 13 to 16 provided in the bus bar device 11 are disposed on both sides in the axial direction of the accommodating portion 21, respectively. However, any one of the four bus bars 13 to 16 is arranged at one end portion in the axial direction of the accommodating portion 21, and the remaining three bus bars are arranged at the other end portion in the axial direction of the accommodating portion 21. Also good.

  In the above embodiment, the bus bar device 11 includes four bus bars 13 to 16. However, the number of bus bars provided in the bus bar device 11 may be changed as appropriate. However, the plurality of bus bars are arranged separately at one end and the other end in the axial direction of the accommodating portion 21 so that the plurality of arc-shaped portions are coaxial. In this case, the radial width of the bus bar holder 12 can be easily reduced by setting the curvature of the arc so that at least a part of the arc-shaped portions of at least two bus bars of the plurality of bus bars overlaps each other in the axial direction. As a result, the width of the bus bar device 11 in the radial direction can be easily reduced.

  -In above-mentioned embodiment, the arc-shaped parts 13a-16a of each bus-bar 13-16 are each press-contacted to the outer peripheral side inner wall surface 31b, 34c, 41b, 44c provided in the bus-bar holder 12 by radial direction with the elastic force. Yes. However, the arc-shaped portions 13a to 16a of the bus bars 13 to 16 are pressed against the radially inner wall surfaces of the inner peripheral surfaces of the first to fourth installation portions 31, 34, 41, and 44 by the elastic force. It may be configured as follows. Even if it does in this way, the effect similar to (6) of the said embodiment can be acquired. Further, the arc-shaped portions 13a to 16a of the respective bus bars 13 to 16 may be configured not to be in pressure contact with the outer peripheral side inner wall surfaces 31b, 34c, 41b, and 44c in the radial direction. In this case, a configuration for fixing the bus bars 13 to 16 to the bus bar holder 12 may be provided.

  In the above embodiment, the guide hole 24 has a circular shape when viewed from the axial direction, but may be a long hole whose shape viewed from the axial direction is long in the radial direction. In this case, the coil connection portions 15b and 16b of the U-phase bus bar 15 and the common bus bar 16 are also formed with a substantially constant width in the circumferential direction and long in the radial direction. Even if it does not carry out with high precision, the connection end part 8a can be easily arrange | positioned in the coil connection parts 15b and 16b via the guide hole 24. FIG.

  The bus bar holder 12 may be configured without the guide hole 24. In this case, the connection end portions 8a of the coils U1, U3, V1, V3, W2, and W4 are connected to the coil connection portions 15b and 16b from the outer peripheral side of the bus bar holder 12, respectively.

  -In the said embodiment, the step-shaped recessed part 34a of the 2nd installation part 34 makes the shape which dented the opening part of the groove-shaped 1st installation part 31 opened in the axial direction and extended in the circumferential direction on the radial direction outer side. Yes. However, the 2nd installation part 34 is formed in the inner peripheral side of the 1st installation part 31, and the step-shaped recessed part 34a is good also as a shape which dented the opening part of the 1st installation part 31 to radial inside. The same applies to the stepped recess 44 a of the fourth installation portion 44.

  In the above embodiment, the arc-shaped portions 13a, 14a of the two bus bars 13, 14 arranged so as to be aligned in the axial direction at the axial end of the accommodating portion 21 on the stator 5 side are groove-shaped first installations. The first installation portion 31 and the second installation portion 34 each having a stepped recess 34a formed by recessing the opening of the first installation portion 31 radially outward. However, at the end of the accommodating portion 21 on the stator 5 side, two accommodating grooves extending in the circumferential direction and having different axial depths are formed so as to be aligned in the radial direction. The arc-shaped portions 13a and 14a of the bus bars 13 and 14 may be accommodated. The same applies to the two bus bars 15 and 16 arranged in the axial direction at the end in the axial direction opposite to the stator 5 of the accommodating portion 21.

  In the above embodiment, the arc curvatures of the arc-shaped portion 13a of the V-phase bus bar 13 and the arc-shaped portion 15a of the U-phase bus bar 15 respectively arranged at both axial ends of the accommodating portion 21 are equal. Further, the arc curvatures of the arc-shaped portion 14a of the W-phase bus bar 14 and the arc-shaped portion 16a of the common bus bar 16 respectively disposed at both ends in the axial direction of the accommodating portion 21 are equal. However, the arc-shaped portion of any one of the at least one bus bar arranged at one end portion in the axial direction of the accommodating portion 21 and the at least one bus bar arranged at the other end portion in the axial direction of the accommodating portion 21 Only one of the arc portions of the bus bar may be formed in an arc shape having the same curvature. Even if it does in this way, the effect similar to (3) of the said embodiment can be acquired. Moreover, each bus-bar 13-16 may be comprised so that the curvature of the circular arc of arc-shaped part 13a-16a may become a respectively different curvature.

  In the above embodiment, each of the bus bars 13 to 16 is formed by bending a plurality of portions in the longitudinal direction of the plate-shaped conductive material S2 formed by crushing the wire S1 having a circular cross section in the radial direction. However, the bus bars 13 to 16 may be formed by bending a plurality of portions in the longitudinal direction of a strip-shaped plate material (conductive plate material) formed by punching a conductive metal plate material by pressing.

  -In the said embodiment, each coil connection part 13b-16b of each bus-bar 13-16 has comprised the U shape which the shape seen from the axial direction opened radially inside, and remove | excluding the arc-shaped site | part of a front-end | tip. The width in the circumferential direction of the part is formed substantially constant. However, each coil connection part 13b-16b may be formed so that the width | variety of the circumferential direction may become narrow gradually as it goes to radial direction inner side (namely, it goes to a base end from a front-end | tip). For example, when the bus bars 13 to 16 are arranged in the bus bar holder 12, the circumferential widths of the coil connection portions 13b to 16b are reduced by pressing the base end portions of the coil connection portions 13b to 16b in the circumferential direction. You may make it become narrow gradually as it goes to radial direction inner side (it goes to a base end part). Further, for example, the circumferential width of each terminal opening 31 a, 34 b, 41 a, 44 b is narrower than the circumferential width of the coil connecting portions 13 b to 16 b of each bus bar 13 to 16 before being arranged on the bus bar holder 12. When the bus bars 13 to 16 are disposed on the bus bar holder 12, the base ends of the coil connection portions 13b to 16b are pressed in the circumferential direction by the terminal openings 31a, 34b, 41a, and 44b, respectively. You may make it the circumferential width of the coil connection parts 13b-16b become narrow gradually as it goes to radial inside. In this case, the coil connecting portions 13b to 16b of the bus bars 13 to 16 disposed in the bus bar holder 12 have the circumferential width gradually narrowing toward the inner side in the radial direction, and thus the coils U1 to U4. , V1 to V4, and W1 to W4 are restricted from moving radially inward in the connecting end 8a. Therefore, joining of each coil connection part 13b-16b and each connection end part 8a of coils U1-U4, V1-V4, W1-W4 can be performed more easily. Further, the bus bar can be easily formed as compared with the bus bars 13 to 16 having the coil connecting portions 13b to 16b in which the circumferential widths of the portions excluding the arc-shaped portion at the tip are formed substantially constant as in the above embodiment. It becomes.

  -In the said embodiment, each coil connection part 13b-16b has comprised the U shape which the shape seen from the axial direction opens to radial inside. However, the shape of each of the coil connecting portions 13b to 16b is not limited to the U shape as long as the shape protrudes radially outward of the arc-shaped portions 13a to 16a and opens radially inward. For example, each of the coil connecting portions 13b to 16b may have a V shape, a U shape, or the like that opens in the radial direction when viewed from the axial direction.

  In the embodiment described above, the bus bar device 11 is fixed to the end of the stator 5 in the axial direction on the end frame 3 side. However, the bus bar device 11 may be fixed to the housing case 1 or the end frame 3.

  In the above embodiment, the stator 5 includes twelve coils U1 to U4, V1 to V4, and W1 to W4. However, the number of coils constituting the stator 5 is not limited to this and may be changed as appropriate.

(A) is sectional drawing of a brushless motor, (b) And (c) is the elements on larger scale in Fig.1 (a). The bottom view of a stator. The top view of a bus-bar apparatus. The bottom view of a bus-bar apparatus. (A) is sectional drawing (AA sectional drawing in FIG. 4) of a bus-bar apparatus, (b) is the elements on larger scale in FIG. 5 (a). The top view of a bus-bar holder. The bottom view of a bus-bar holder. (A) is a perspective view of the wire for forming a conductive material, (b) is a perspective view of the conductive material for forming a bus bar. Connection diagram of brushless motor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Housing case, 2a, 2b ... Bearing, 5 ... Stator, 8a ... Connection end part as an edge part of a coil, 11 ... Bus-bar apparatus, 12 ... Bus-bar holder, 13 ... V-bar bus bar as a bus bar and a bus bar for electric power feeding , 13a to 16a ... arc-shaped portions, 13b to 16b ... coil connection portions as connection portions, 13c to 15c ... terminal connection portions, 14 ... W-phase bus bars as bus bars and power supply bus bars, 15 ... as bus bars and power supply bus bars U-phase bus bar, 16 ... common bus bar as bus bar and bus bar, 21 ... accommodating portion, 24 ... guide hole, 31 ... first installation portion as accommodating groove, 31b, 34c, 41b, 44c ... outer peripheral side inner wall surface as wall surface , 34a, 44a ... stepped recesses, 41 ... third installation portion as an accommodation groove, 51 ... rotor, 52 ... rotating shaft, 55 ... sensor rotor, 56 Sensor stator, 57 ... resolver, S1 ... wire, S2 ... conductive material as the conductive plate, Tv, Tw, Tu ... power supply terminal, U1 to U4, V1-V4, W1 to W4 ... coils.

Claims (9)

An arc-shaped portion formed by bending a strip-shaped conductive plate material in the longitudinal direction so that the plate thickness direction coincides with the radial direction, and the conductive plate material projecting radially outward from the arc-shaped portion and opening radially inward A plurality of bus bars having a plurality of connecting portions to which the ends of the coils are connected,
The bus bar is formed in an annular shape with an insulating synthetic resin material, and the bus bars are respectively disposed at both ends in the axial direction, and the arc-shaped portions of the plurality of bus bars are coaxial and spaced apart in the axial direction. A bus bar device comprising: a bus bar holder that accommodates the plurality of arc-shaped portions so as to be lined up. The bus bar device according to claim 1,
Each of the bus bars is formed by bending a plurality of portions in the longitudinal direction of one conductive material obtained by crushing a wire having a conductive and plastically deformable cross-sectional shape in the radial direction of the wire to form a plate shape. A bus bar device characterized by that. In the bus bar device according to claim 1 or 2,
The bus bar holder has a housing portion that has a cylindrical shape and houses the arc-shaped portion of the bus bar at both axial end portions thereof,
The bus bar device characterized in that the arc-shaped portions of at least a pair of the bus bars among the plurality of bus bars have the same curvature of each arc and are respectively accommodated at both axial ends of the accommodating portion. In the bus-bar apparatus of any one of Claim 1 thru | or 3,
The bus bar holder includes an accommodation groove that opens in the axial direction and extends in the circumferential direction, and a stepped recess formed by recessing the opening of the accommodation groove radially outward or radially inward.
One of the bus bars axially adjacent to the bus bar in which the arc-shaped portion is accommodated in the accommodating groove is at least part of the arc-shaped portion is accommodated in the stepped recess. In the bus-bar apparatus of any one of Claim 1 thru | or 4,
The bus bar holder includes a plurality of guide holes that penetrate the bus bar holder in the axial direction and face the connecting portion in the axial direction and guide the end of the inserted coil to the connecting portion. And busbar device. In the bus-bar apparatus of any one of Claim 1 thru | or 5,
The bus bar holder includes at least one wall surface extending in the circumferential direction and parallel to the axial direction,
The bus bar device, wherein the arc-shaped portion of at least one of the bus bars is pressed against the wall surface in a radial direction by an elastic force of the arc-shaped portion. The bus bar device according to any one of claims 1 to 6,
Four bus bars, including three power supply bus bars corresponding to the U phase, V phase and W phase respectively, and one common bus bar serving as a neutral point,
The bus bar device is characterized in that two bus bars are arranged at each of both end portions in the axial direction of the bus bar holder. In the bus-bar apparatus of Claim 7,
The three power supply bus bars each include a terminal connection portion to which a power supply terminal for supplying power of each phase extends from the arcuate portion toward the radially outer side, and is continuously arranged in the axial direction. A bus bar device characterized by that. A bottomed cylindrical housing case;
An annular stator having a plurality of the coils fixed to the inner peripheral surface of the housing case and arranged in the circumferential direction;
A rotor having a rotating shaft supported by annular bearings arranged on both sides in the axial direction of the stator, and arranged inside the stator;
A resolver composed of an annular sensor rotor fixed to the rotating shaft, and an annular sensor stator disposed to face the sensor rotor in a radial direction;
9. A brushless motor comprising: the bus bar device according to claim 1 disposed on an outer peripheral side of any one of the bearings or an outer peripheral side of the resolver.

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