JP6353722B2 - Bus bar unit and rotating electric machine equipped with the same - Google Patents

Description

  The present invention relates to a bus bar unit and a rotating electrical machine including the bus bar unit.

  Patent Document 1 discloses a bus bar unit that supplies current from a terminal portion to coils of each phase of a stator. This bus bar unit includes a plurality of bus bars that supply current to each coil of the stator, and a bus bar base that holds these bus bars spaced apart in the radial direction of the stator.

  The bus bar base includes an annular main body portion having an annular groove that accommodates a plurality of bus bars, and a plurality of extending portions that extend from the outer peripheral end of the main body portion and have engaging protrusions at the tips. The bus bar unit is attached to the stator by engaging engagement protrusions of the respective extending portions with engagement recesses on the stator side by snap fitting.

JP 2013-212008 JP

  In the above prior art, since the extended portion where the engaging protrusion is formed is provided on the bus bar unit side, the extended portion is formed from the bus bar base according to the outer diameter of the stator side member engaged by the snap fit. Set to large diameter. Therefore, the radial dimension of the bus bar unit is increased.

  This invention is made | formed in view of such a technical subject, and it aims at providing the bus-bar unit which can reduce a radial direction dimension, and a rotary electric machine provided with the same.

The present invention is a bus bar unit having a bus bar for energizing a coil wound around a stator, and a bus bar holder made of an insulating member for holding the bus bar, the bus bar holder facing the stator toward the stator shaft. An extending portion that extends in a direction, and an engaging portion that protrudes from the extending portion in the circumferential direction of the stator and engages with an engaged portion of the stator, and the extending portion A notch is formed at the front end of the stator, and the engaging portion is formed to protrude on both sides in the circumferential direction of the stator with the notch interposed therebetween, and the engaging portion is bent toward the notch, thereby causing the engagement. A joining portion engages with the engaged portion of the stator .

The present invention is also a bus bar unit having a bus bar energizing a coil wound around the stator and a bus bar holder made of an insulating member for holding the bus bar, the bus bar holder facing the stator toward the stator An extending portion that extends in the axial direction of the stator, and an engaging portion that protrudes from the extending portion in the circumferential direction of the stator and engages with the engaged portion of the stator. The installation portion is characterized in that the engaging portion engages with the engaged portion of the stator by bending outward in the radial direction of the stator .

According to the present invention, it is possible to reduce the size of the radial dimension of the busbar unit and diameter of the bar Subahoruda.

It is sectional drawing of the motor provided with the bus-bar unit in 1st Embodiment of this invention. It is a perspective view of the bus-bar unit in 1st Embodiment of this invention. It is sectional drawing of the motor provided with the bus-bar unit in 2nd Embodiment of this invention. It is a perspective view of the bus-bar unit in 2nd Embodiment of this invention. It is sectional drawing of the motor provided with the bus-bar unit in 3rd Embodiment of this invention. It is a perspective view of the bus-bar unit in 3rd Embodiment of this invention. It is sectional drawing of the motor provided with the bus-bar unit in 4th Embodiment of this invention. It is a perspective view of the bus-bar unit in 4th Embodiment of this invention. It is sectional drawing of the motor provided with the bus-bar unit in 5th Embodiment of this invention. It is a perspective view of the bus-bar unit in 5th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, the first embodiment will be described.

  FIG. 1 is a cross-sectional view of a motor 100 equipped with a bus bar unit 110 according to this embodiment. FIG. 2 is a perspective view of the bus bar unit 110 in the present embodiment. In the following description, the rotation axis direction of the motor 100 is referred to as “axial direction”, the radial direction around the rotation axis of the motor 100 is referred to as “radial direction”, and the direction around the rotation axis of the motor 100 is “ It is called “circumferential direction”.

  A motor 100 as a rotating electrical machine is a three-phase (U-phase, V-phase, W-phase) AC motor, and is used, for example, in an electric power steering device of a vehicle. The motor 100 includes a metal motor case 10, a motor cover 20 made of an insulating resin material that covers the opening of the motor case 10, and is accommodated in the motor case 10 and rotated by the motor case 10 and the motor cover 20. The rotor 30 is pivotally supported, and the stator 40 is provided on the inner peripheral surface of the motor case 10 and is disposed with a predetermined gap on the outer periphery of the rotor 30.

  The motor case 10 includes a cylindrical tube portion 11, a bottom portion 12 that closes one end of the tube portion 11, an annular opening end portion 13 that is formed around an opening portion that opens at the other end of the tube portion 11, Have

  The motor cover 20 is fastened to the opening end 13 of the motor case 10 by a plurality of bolts (not shown). A seal ring 21 seals between the motor cover 20 and the motor case 10.

  The rotor 30 includes a rotor shaft 31 that is rotatably supported by the motor case 10 and a rotor core 32 that houses a plurality of magnets (permanent magnets) that are inserted through the rotor shaft 31 in the axial direction and arranged at predetermined intervals in the circumferential direction. And having.

  One end of the rotor shaft 31 is supported on the bottom 12 of the motor case 10 via a bearing 33, and the other end is supported on the motor cover 20 via a bearing 34. Thereby, the rotor 30 is supported rotatably about the central axis O.

  The stator 40 includes a stator core 41 provided on the inner side of the motor case 10 and a plurality of stator coils 42 provided on the stator core 41 at a predetermined interval in the circumferential direction.

  The stator core 41 is made of a magnetic material, and is formed by laminating a plurality of steel plates having a plurality of teeth portions 41a extending radially in the radial direction in the axial direction. The stator core 41 is fixed to the motor case 10 by fitting the outer periphery thereof to the inner periphery of the motor case 10.

  The stator coil 42 includes a plurality of insulators 120 made of an insulating resin material surrounding each tooth portion 41a of the stator core 41, and an electromagnetic coil 43 as a plurality of coils made of a wire rod wound around the tooth portion 41a via each insulator 120. And. The end of the wire 44 of the electromagnetic coil 43 is drawn out of the stator coil 42 from the gap between the bus bar unit 110 and the insulator 120.

  The motor 100 further includes a bus bar unit 110 provided side by side with the stator coil 42 in the axial direction.

  The bus bar unit 110 includes a plurality of bus bars 50 made of a conductive material that energizes the electromagnetic coil 43 wound around the stator 40, and a bus bar holder 111 made of an insulating resin material that holds the bus bar 50 inside.

  The bus bar holder 111 is formed by insert molding using an insulating resin material. That is, when the bus bar unit 110 is manufactured, the bus bar holder 111 is formed by injecting an insulating resin material into the mold after disposing each bus bar 50 in the mold (not shown). Each bus bar 50 is held in the bus bar holder 111 while being separated in the axial direction or the radial direction.

  The plurality of bus bars 50 includes four bus bars 50 corresponding to the U phase, the V phase, the W phase, and the neutral point. The plate-like bus bar 50 corresponding to each phase includes an arcuate conductive part 51 extending in an arcuate shape around the central axis O, and a plurality of power supply terminals 52 projecting radially from the arcuate conductive part 51. And one bus bar terminal 53 protruding in the axial direction from the arcuate conductive portion 51.

  A plurality of power supply terminals 52 corresponding to each phase protrude from the outer periphery of the bus bar holder 111. Three bus bar terminals 53 connected to the AC power supply protrude from one end of the bus bar holder 111.

  The bus bar holder 111 has a positioning step 112 as a block-like engaged portion protruding from the outer peripheral surface. Three positioning step portions 112 are arranged at substantially equal intervals in the circumferential direction along the outer peripheral surface of the bus bar holder 111. The positioning step 112 is integrally formed with a resin material together with the bus bar holder 111 when the bus bar holder 111 is molded. Note that the number of positioning steps 112 is not limited to three and may be three or more.

  Each positioning step 112 is offset in the circumferential direction with respect to the power supply terminal 52 of each bus bar 50 so as not to overlap with the power supply terminal 52 of each bus bar 50 in the axial direction. As a result, the wire 44 extending from the electromagnetic coil 43 and connected to the power supply terminal 52 of the bus bar 50 does not interfere with the positioning step 112.

  Moreover, the outer peripheral surface of each positioning step part 112 is comprised from the protruding raised part 113 located in the circumferential direction both sides, and the recessed part 114 which is arrange | positioned between the raised parts 113 and is depressed from the raised part 113.

  The insulator 120 has an extending portion 121 extending in the axial direction from the outer peripheral end of the axial end surface on the bus bar unit 110 side toward the bus bar unit 110. Three extending portions 121 are arranged at substantially equal intervals along the circumferential direction so as to be engageable with the positioning step portion 112 of the bus bar holder 111. The circumferential width of the extending portion 121 is set to be approximately equal to the width of the concave portion 114 of the positioning step portion 112. The outer peripheral surface of the extending portion 121 extends from the outer peripheral surface of the insulator 120 without a step. A claw portion 122 is formed at the tip of the extended portion 121 as an engaging portion that protrudes toward the inner peripheral side of the extended portion 121.

  The bus bar holder 111 is positioned with respect to the stator coil 42 by engaging the plurality of extending portions 121 of the insulator 120 with the positioning step portions 112 by snap fitting. That is, the extended portion 121 is fitted in the concave portion 114 of the positioning step portion 112 and the claw portion 122 is locked to the positioning step portion 112, so that the bus bar holder 111 is radially and circumferentially connected to the stator coil 42. Positioned in the direction. Thereby, the bus bar holder 111 is arranged on the same axis as the stator coil 42 and is held at a predetermined rotational position.

  When the motor 100 is assembled, the bus bar unit 110 is assembled to the stator coil 42 after the stator coil 42 is assembled to the stator core 41. At this time, the wire 44 of each electromagnetic coil 43 extends from the gap between the opening end of the insulator 120 and the outer peripheral end of the bus bar holder 111, and the respective leading end portions are welded to the power feeding terminals 52 of the respective bus bars 50.

  Subsequently, after the stator 40 is assembled to the motor case 10, the motor cover 20 is assembled to the motor case 10. At this time, the three bus bar terminals 53 protruding from one end of the bus bar holder 111 pass through the holes of the motor cover 20.

  The motor cover 20 is provided with a terminal 55 connected to the electric wire 54 corresponding to each phase. After the motor cover 20 is fastened to the motor case 10, each bus bar terminal 53 is welded to one end of each terminal 55.

  When the motor 100 is operated, a drive current is supplied to each electromagnetic coil 43 through the electric wire 54, the terminal 55, and the bus bar 50, and the rotor 30 is rotated by the magnetic force generated in the stator core 41.

  According to the above embodiment, there exist the effects shown below.

  The bus bar holder 111 is attached to the insulator 120 by engaging the positioning step 112 provided on the outer peripheral surface of the bus bar holder 111 with the extended portion 121 extending in the axial direction from the insulator 120 by snap fitting. Thereby, the diameter of the bus bar holder 111 can be reduced as compared with a structure in which the extended portion 121 is provided in the bus bar holder 111 and engaged with the outer peripheral surface of the insulator 120 by snap fitting. Accordingly, the radial dimension of the bus bar unit 110 can be reduced.

  Next, a second embodiment will be described.

  FIG. 3 is a cross-sectional view of the motor 200 on which the bus bar unit 210 according to this embodiment is mounted. FIG. 4 is a perspective view of the bus bar unit 210 in the present embodiment. In the following description, differences from the first embodiment will be mainly described, and the same components as those of the motor 200 of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In the present embodiment, the structure for engaging the bus bar holder 211 and the insulator 220 is different from that in the first embodiment.

  The bus bar holder 211 of the present embodiment does not have the positioning step 112 of the first embodiment. The insulator 220 has an extending portion 221 that is an axial end surface on the bus bar unit 210 side and extends in the axial direction from the outer peripheral side to the bus bar unit 210 from the electromagnetic coil 43. Three extending portions 221 are arranged at substantially equal intervals along the circumferential direction. A protruding portion 222 is formed at the tip of the extending portion 221 as an engaging portion that protrudes toward the inner peripheral side of the extending portion 221. The axial dimension from the insulator 220 to the protrusion 222 of the extended portion 221 is set to be approximately equal to the axial dimension of the bus bar holder 211.

  In the bus bar holder 211, a plurality of extending portions 221 of the insulator 220 have corners as engaged portions at portions where the end surface of the bus bar holder 211 opposite to the insulator 220 in the axial direction and the outer peripheral surface of the bus bar holder 211 intersect. By being engaged with the portion 212 by a snap fit, it is positioned with respect to the stator coil 42. That is, the protrusion 222 of the extending portion 221 engages with the corner portion 212 of the bus bar holder 211 in a state where the bus bar holder 211 is in contact with the insulator 220, so that the bus bar holder 211 is in the radial direction with respect to the stator coil 42. Positioned. As a result, the bus bar holder 211 is arranged on the same axis as the stator coil 42.

  In the present embodiment, the bus bar holder 211 is not configured to be positioned in the circumferential direction. For example, a plurality of raised portions are provided in the corner portion 212 of the bus bar holder 211, and an extended portion is provided between the raised portions. 221 protrusion 222 may be configured to fit. Thereby, the bus bar holder 211 can be positioned in the circumferential direction, and the bus bar holder 211 is held at a predetermined rotational position.

  According to the above embodiment, there exist the effects shown below.

  The bus bar holder 211 is attached to the insulator 220 by engaging the protrusion 222 of the extending portion 221 extending in the axial direction from the insulator 220 with the corner portion 212 of the bus bar holder 211 by snap fit. As a result, the diameter of the bus bar holder 211 can be reduced compared to a structure in which the extended portion 221 is provided in the bus bar holder 211 and engaged with the outer peripheral surface of the insulator 220 by snap fitting. Therefore, the radial dimension of the bus bar unit 210 can be reduced.

  Further, since the protrusion 222 of the extending portion 221 extending in the axial direction from the insulator 220 is engaged with the corner portion 212 of the bus bar holder 211 by snap fit, the bus bar holder 211 and the insulator 220 are engaged with each other. The bus bar holder 211 does not require a special configuration. Therefore, since the shape of the mold for molding the bus bar holder 211 is simplified, molding of the resin is facilitated, the manufacturing cost of the bus bar holder 211 can be reduced, and the quality can be improved.

  Next, a third embodiment will be described.

  FIG. 5 is a cross-sectional view of the motor 300 on which the bus bar unit 310 according to this embodiment is mounted. FIG. 6 is a perspective view of the bus bar unit 310 in the present embodiment. In the following description, differences from the first embodiment will be mainly described, and the same components as those of the motor 300 of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In the present embodiment, the structure for engaging the bus bar holder 311 and the insulator 320 is different from that in the first embodiment.

  The bus bar holder 311 of this embodiment has a recess 312 as an engaged portion on the outer peripheral surface instead of the positioning step 112 of the first embodiment. Three recesses 312 are arranged at substantially equal intervals in the circumferential direction along the outer peripheral surface of the bus bar holder 311. Note that the number of the recesses 312 is not limited to three and may be three or more.

  The insulator 320 has an extending portion 321 that is an axial end surface on the bus bar unit 310 side and extends in the axial direction from the outer peripheral side to the bus bar unit 310 from the electromagnetic coil 43. Three extending portions 321 are arranged at substantially equal intervals along the circumferential direction so as to correspond to the recess 312 of the bus bar holder 311. The axial dimension of the extending portion 321 is set substantially equal to the axial dimension of the bus bar holder 311. On the inner peripheral surface of the extended portion 321, a protrusion 322 is formed as an engaging portion that protrudes toward the inner peripheral side of the extended portion 321. The protrusion 322 is set to a dimension that can be engaged with the recess 312 of the bus bar holder 311.

  The bus bar holder 311 is positioned with respect to the stator coil 42 by engaging a plurality of extending portions 321 of the insulator 320 with the recesses 312 by snap fitting. That is, the bus bar holder 311 is positioned in the radial direction and the circumferential direction with respect to the stator coil 42 by the protrusion 322 of the extended portion 321 being fitted into the recess 312. As a result, the bus bar holder 311 is disposed on the same axis as the stator coil 42 and is held at a predetermined rotational position.

  According to the above embodiment, there exist the effects shown below.

  The bus bar holder 311 is attached to the insulator 320 by engaging the recess 312 provided on the outer peripheral surface of the bus bar holder 311 with the protrusion 322 of the extending portion 321 extending in the axial direction from the insulator 320 by snap fitting. Thereby, the diameter of the bus bar holder 311 can be reduced as compared with a structure in which the extended portion 321 is provided in the bus bar holder 311 and engaged with the outer peripheral surface of the insulator 320 by snap fit. Therefore, the radial dimension of the bus bar unit 310 can be reduced.

  Further, since the tip of the extending portion 321 of the insulator 320 does not protrude from the motor cover side end surface of the bus bar holder 311 to the motor cover 20 side, the bus bar unit 310 is accommodated in the motor case 10 and the motor cover 20 is attached to the motor case 10. When assembled, the contact area between the bus bar unit 310 and the motor cover 20 can be increased. Therefore, as compared with the case where the bus bar unit 310 contacts at three places in the circumferential direction as in the second embodiment, the play of the bus bar unit 310 can be more reliably suppressed.

  Next, a fourth embodiment will be described.

  FIG. 7 is a sectional view of the motor 400 on which the bus bar unit 410 according to this embodiment is mounted. FIG. 8 is a perspective view of the bus bar unit 410 in the present embodiment.

  In the present embodiment, the structure for engaging the bus bar holder 411 and the insulator 420 is different from that in the first embodiment. In the following description, the rotation axis direction of the motor 400 is referred to as “axial direction”, the radial direction around the rotation axis of the motor 400 is referred to as “radial direction”, and the direction around the rotation axis of the motor 400 is “ It is called “circumferential direction”.

  The motor 400 is a three-phase (U-phase, V-phase, W-phase) AC motor, and is used, for example, in an electric power steering device for a vehicle. The motor 400 includes a metal motor case 10, a motor cover 20 made of an insulating resin material that covers the opening of the motor case 10, and is accommodated in the motor case 10 and rotated by the motor case 10 and the motor cover 20. The rotor 30 is pivotally supported, and the stator 40 is provided on the inner peripheral surface of the motor case 10 and is disposed with a predetermined gap on the outer periphery of the rotor 30.

  The motor case 10 includes a cylindrical tube portion 11, a bottom portion 12 that closes one end of the tube portion 11, an annular opening end portion 13 that is formed around an opening portion that opens at the other end of the tube portion 11, Have

  The motor cover 20 is fastened to the opening end 13 of the motor case 10 by a plurality of bolts (not shown). A seal ring 21 seals between the motor cover 20 and the motor case 10.

  The rotor 30 includes a rotor shaft 31 that is rotatably supported by the motor case 10 and a rotor core 32 that houses a plurality of magnets (permanent magnets) that are inserted through the rotor shaft 31 in the axial direction and arranged at predetermined intervals in the circumferential direction. And having.

  One end of the rotor shaft 31 is supported on the bottom 12 of the motor case 10 via a bearing, and the other end is supported on the motor cover 20 via a bearing. Thereby, the rotor 30 is supported rotatably about the central axis O.

  The stator 40 includes a stator core 41 provided on the inner side of the motor case 10 and a plurality of stator coils 42 provided on the stator core 41 at a predetermined interval in the circumferential direction.

  The stator core 41 is made of a magnetic material, and is formed by laminating a plurality of steel plates having a plurality of teeth portions 41a extending radially in the radial direction in the axial direction. The stator core 41 is fixed to the motor case 10 by fitting the outer periphery thereof to the inner periphery of the motor case 10.

  The stator coil 42 includes a plurality of insulators 420 made of an insulating resin material that surrounds each tooth portion 41a of the stator core 41, and a plurality of electromagnetic coils 43 made of a wire 44 wound around the tooth portion 41a via each insulator 420. Consists of The end of the wire 44 of the electromagnetic coil 43 is drawn out of the stator coil 42 from the gap between the bus bar unit 410 and the insulator 420.

  The motor 400 further includes a bus bar unit 410 provided side by side with the stator coil 42 in the axial direction.

  The bus bar unit 410 includes a plurality of bus bars 50 made of a conductive material that energizes the electromagnetic coil 43 wound around the stator 40, and a bus bar holder 411 made of an insulating resin material that holds the bus bar 50 inside.

  The bus bar holder 411 is formed by insert molding using an insulating resin material. That is, when the bus bar unit 410 is manufactured, the bus bar holder 411 is formed by injecting an insulating resin material into the mold after the bus bars 50 are arranged in the mold (not shown). Each bus bar 50 is held in the bus bar holder 411 so as to be separated in the axial direction or the radial direction.

  The plurality of bus bars 50 includes four bus bars 50 corresponding to the U phase, the V phase, the W phase, and the neutral point. The plate-like bus bar 50 corresponding to each phase includes an arcuate conductive part 51 extending in an arcuate shape around the central axis O, and a plurality of power supply terminals 52 projecting radially from the arcuate conductive part 51. And one bus bar terminal 53 protruding in the axial direction from the arcuate conductive portion 51. The plate-like bus bar 50 corresponding to the neutral point has an arcuate conductive part 51 extending in an arcuate shape with the central axis O as the center, and an electromagnetic coil 43 of each phase protruding from the arcuate conductive part 51 in the radial direction. And a plurality of power supply terminals 52 for connecting the two.

  A plurality of power supply terminals 52 corresponding to each phase protrude from the outer periphery of the bus bar holder 411. Three bus bar terminals 53 connected to the AC power source protrude from one end of the bus bar holder 411.

  The bus bar holder 411 has an extending portion 412 that protrudes from the outer peripheral surface and engages with the outer peripheral surface of the stator coil 42. Three extending portions 412 are arranged at substantially equal intervals in the circumferential direction along the outer peripheral surface of the bus bar holder 411. The extending portion 412 is integrally formed of a resin material together with the bus bar holder 411 when the bus bar holder 411 is molded. Note that the number of extending portions 412 is not limited to three and may be three or more.

  Each extending portion 412 is provided offset in the circumferential direction with respect to the power supply terminal 52 of each bus bar 50 so as not to overlap with the power supply terminal 52 of each bus bar 50 in the axial direction. As a result, the wire 44 extending from the electromagnetic coil 43 and connected to the power feeding terminal 52 of the bus bar 50 does not interfere with the extended portion 412.

  The extending portion 412 includes a base end portion 413 that protrudes in the radial direction from the outer peripheral surface, and a front end portion 414 that is bent from the base end portion 413 and extends toward the stator coil 42 in the axial direction. The base end portion 413 of the extending portion 412 extends without a step from the end surface on the stator coil 42 side of the bus bar holder 411 and abuts on the end surface on the bus bar unit side of the insulator 420. The distal end portion 414 of the extending portion 412 is bent from the distal end of the base end portion 413 and engages with an engaged portion 421 formed on the outer periphery of the insulator 420.

  A claw portion 415 as an engaging portion formed to protrude on both sides in the circumferential direction, and a notch 416 formed between the claw portions 415 at the front end of the front end portion 414 are formed at the front end portion 414 of the extending portion 412. Are provided. The bus bar holder 411 is engaged with the stator coil 42 by engaging the front end portions 414 of the plurality of extending portions 412 with the engaged portion 421 on the outer periphery of the insulator 420.

  On the outer periphery of the insulator 420, an engaged portion 421 that engages with the tip portion 414 of the extending portion 412 is formed. Three engaged portions 421 are arranged at substantially equal intervals along the circumferential direction so that the distal end portion 414 of the extending portion 412 can be engaged. The engaged portion 421 includes a concave portion 422 that is recessed from the outer peripheral surface of the insulator 420, and a locking portion 423 that is formed on the bus bar holder 411 side of the concave portion 422 and has a smaller circumferential width than the concave portion 422. . The circumferential width of the locking portion 423 is set to be substantially equal to the width of the tip portion 414 of the extending portion 412 and smaller than the width of the portion where the claw portion 415 is formed.

  The bus bar holder 411 is positioned with respect to the stator coil 42 by engaging the end portions 414 of the extending portions 412 with the engaging portions 423 by snap fitting. At this time, the nail | claw part 415 of the front-end | tip part 414 of the extension part 412 moves to an axial direction, bending to the notch 416 side, and the nail | claw part 415 passes the latching | locking part 423 to an axial direction.

  That is, the end portion 414 of the extended portion 412 is fitted to the locking portion 423 and the claw portion 415 is locked to the locking portion 423, so that the bus bar holder 411 has a radial direction relative to the stator coil 42. Positioned in the circumferential direction. Accordingly, the bus bar holder 411 is disposed on the same axis as the stator coil 42 and is held at a predetermined rotational position.

  When the motor 400 is assembled, the bus bar unit 410 is assembled to the stator coil 42 after the stator coil 42 is assembled to the stator core 41. At this time, the wire 44 of each electromagnetic coil 43 extends from the gap between the opening end of the insulator 420 and the outer peripheral end of the bus bar holder 411, and the respective end portions 414 are welded to the power supply terminals 52 of the respective bus bars 50.

  Subsequently, after the stator 40 is assembled to the motor case 10, the motor cover 20 is assembled to the motor case 10. At this time, the three bus bar terminals 53 protruding from one end of the bus bar holder 411 pass through the holes of the motor cover 20.

  The motor cover 20 is provided with a terminal 55 connected to the electric wire 54 corresponding to each phase. After the motor cover 20 is fastened to the motor case 10, each bus bar terminal 53 is welded to one end of each terminal 55.

  When the motor 400 is operated, a drive current is supplied to each electromagnetic coil 43 through the electric wire 54, the terminal 55, and the bus bar 50, and the rotor 30 is rotated by the magnetic force generated in the stator core 41.

  According to the above embodiment, there exist the effects shown below.

  Since the claw portion 415 of the distal end portion 414 of the extending portion 412 that is formed on the bus bar holder 411 and engages the engaged portion 421 of the stator coil 42 is formed to protrude in the circumferential direction, the claw portion 415 is formed in the distal end portion 414. The bus bar holder 411 can be downsized as compared with the case of projecting from the outer periphery side or the inner periphery side. Therefore, the radial dimension of the bus bar unit 410 can be reduced.

  Furthermore, since the claw portion 415 does not protrude from the recess 422 of the insulator 420 to the inner peripheral side, the number of turns of the electromagnetic coil 43 can be increased or the coil diameter can be increased without increasing the diameter of the insulator 420. Therefore, the performance of the motor 400 can be improved.

  Next, a fifth embodiment will be described.

  FIG. 9 is a cross-sectional view of a motor 500 on which the bus bar unit 510 according to this embodiment is mounted. FIG. 10 is a perspective view of the bus bar unit 510 in the present embodiment. In the following description, differences from the fourth embodiment will be mainly described, and the same components as those of the motor 500 of the fourth embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In the present embodiment, the structure for engaging the bus bar holder 511 and the insulator 520 is different from that in the fourth embodiment.

  A protruding portion 514 as an engaging portion formed to protrude on both sides in the circumferential direction is provided at the distal end portion 513 of the extending portion 512 of the bus bar holder 511. The bus bar holder 511 is engaged with the stator coil 42 by engaging the leading end portions 513 of the plurality of extending portions 512 with the engaged portions 521 on the outer periphery of the insulator 520.

  On the outer periphery of the insulator 520, an engaged portion 521 with which the tip of the extending portion 512 is engaged is formed. Three engaged portions 521 are arranged at substantially equal intervals along the circumferential direction so that the tip portion 513 of the extending portion 512 can be engaged. The engaged portion 521 includes a recess 522 that is recessed from the outer peripheral surface of the insulator 520, and a locking portion 523 that is formed on the bus bar holder 511 side of the recess 522 and has a larger circumferential width than the recess 522. . The shape of the locking portion 523 is set to a shape similar to the protrusion 514 of the tip portion 513 of the extending portion 512.

  The bus bar holder 511 is positioned with respect to the stator coil 42 by engaging the distal end portions 513 of the extending portions 512 with the engaging portions 523 by snap fitting. At this time, the tip portion 513 of the extended portion 512 moves in the axial direction while bending outward in the radial direction, and when the protrusion 514 of the tip portion 513 matches the locking portion 523, the protrusion 514 becomes the locking portion 523. It is inserted. Note that the shape of the protrusion 514 may be any shape including a semicircle or a rectangle as long as the shape is similar to the shape of the locking portion 523.

  Thereby, the bus bar holder 511 is positioned in the radial direction and the circumferential direction with respect to the stator coil 42, arranged on the same axis as the stator coil 42, and held at a predetermined rotational position.

  According to the above embodiment, there exist the effects shown below.

  Since the protruding portion 514 of the distal end portion 513 of the extending portion 512 that is formed on the bus bar holder 511 and engages with the engaged portion 521 of the stator coil 42 is formed to protrude in the circumferential direction, the protruding portion 514 is formed at the distal end portion 513. The bus bar holder 511 can be reduced in size as compared with the case where it protrudes from the outer peripheral side or the inner peripheral side. Therefore, the radial dimension of the bus bar unit 510 can be reduced.

  Furthermore, since the protrusion 514 does not protrude from the recess 522 of the insulator 520 to the inner peripheral side, the number of turns of the electromagnetic coil 43 can be increased or the coil diameter can be increased without increasing the diameter of the insulator 520. Therefore, the performance of the motor 500 can be improved.

  The embodiment of the present invention has been described above. However, the above embodiment is merely one example of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, in the first embodiment, the positioning step 112 of the bus bar holder 111 is provided on the outer peripheral side of the bus bar holder 111, but may be provided on the inner peripheral side of the bus bar holder 111. In this case, the extending portion 121 of the insulator 120 that engages with the positioning step portion 112 by snap fitting may be provided on the inner peripheral side as well.

  Furthermore, in the first embodiment, the positioning step 112 is integrally formed with the bus bar holder 111, but the positioning step 112 may be a separate member.

  Furthermore, in the second embodiment, the plurality of extending portions 221 of the insulator 220 are formed at corner portions 212 of the portion where the end surface of the bus bar holder 211 opposite to the insulator 220 in the axial direction and the outer peripheral surface of the bus bar holder 211 intersect. Although the case of engaging by snap fit is illustrated, the end of the bus bar holder 211 that is opposite to the insulator 220 in the axial direction and the inner peripheral surface of the bus bar holder 211 are engaged by snap fit. Also good. In this case, the extending portion 221 of the insulator 220 may be provided so as to extend to the inner peripheral side of the bus bar holder 211.

  Furthermore, in the third embodiment, the case where the protrusion 322 of the extending portion 321 of the insulator 320 is engaged with the recess 312 formed on the outer peripheral surface of the bus bar holder 211 by snap fitting is illustrated. You may form a recessed part in an internal peripheral surface. In this case, the extending portion 321 of the insulator 320 may be disposed so as to extend to the inner peripheral surface of the insulator 320, and the protrusion 322 may be formed to protrude toward the outer peripheral side of the extending portion 321.

  Furthermore, in 4th Embodiment, although the nail | claw part 415 of the extension part 412 is protruded to the circumferential direction both sides, you may protrude only in any one direction.

  Furthermore, in the fourth and fifth embodiments, the extended portions 412 and 512 of the bus bar holders 411 and 511 are engaged with the engaged portions 421 and 521 formed on the outer peripheral surfaces of the insulators 420 and 520. The engaged portions 421 and 521 may be formed on the inner peripheral surfaces of the insulators 420 and 520. In this case, the extending portions 412 and 512 of the bus bar holders 411 and 511 may be formed so as to extend on the inner peripheral surfaces of the insulators 420 and 520.

  Furthermore, in all the above-described embodiments, the motors 100 to 500 that generate power by electric power are illustrated, but the above-described embodiments can be applied to a generator that generates electric power by power.

  Further, in the above-described embodiment, the bus bar 50 is formed by punching a plate-like conductive member into a shape along the circumferential direction of the stator 40 with a predetermined width, and each bus bar 50 has a predetermined interval in the axial direction. The bus bar units 110, 210, 310, 410, and 510 that are stacked are illustrated, but instead, the bus bar is formed in a shape along the circumferential direction of the stator 40 by curving a linear strip-shaped conductive member in the plate thickness direction. A bus bar unit in which a plurality of bus bars are housed in an insulating holder by changing the diameter of each bus bar may be used.

40 Stator 43 Electromagnetic coil (coil)
50 Busbar 100, 200, 300, 400, 500 Rotating electric machine (motor)
110, 210, 310, 410, 510 Busbar unit 111, 211, 311, 411, 511 Busbar holder 112 Positioning step (engaged portion)
121, 221 and 321 Extension part 122 Claw part (engagement part)
212 Corner (engaged part)
222 Projection (engagement part)
312 Recess (engaged part)
322 Projection (engagement part)
412, 512 Extension part 415 Claw part (engagement part)
416 Notch 421 Engagement part 514 Projection (engagement part)
521 engaged part

Claims (3)

A bus bar unit having a bus bar for energizing a coil wound around a stator and a bus bar holder made of an insulating member for holding the bus bar,
The bus bar holder extends toward the stator in the axial direction of the stator, and protrudes from the extended portion in the circumferential direction of the stator, and is engaged with the engaged portion of the stator. An engaging portion to be
A cutout is formed at the tip of the extended portion,
The engaging portion is formed to protrude on both sides in the circumferential direction of the stator across the notch,
The engaging portion engages with the engaged portion of the stator by bending the engaging portion toward the notch.
A bus bar unit characterized by that . A bus bar unit having a bus bar for energizing a coil wound around a stator and a bus bar holder made of an insulating member for holding the bus bar,
The bus bar holder extends toward the stator in the axial direction of the stator, and protrudes from the extended portion in the circumferential direction of the stator, and is engaged with the engaged portion of the stator. An engaging portion to be
The extending portion is bent outward in the radial direction of the stator so that the engaging portion is engaged with the engaged portion of the stator.
A bus bar unit characterized by that . A rotor rotatably supported;
The stator disposed with a gap on the outer periphery of the rotor;
The bus bar unit according to claim 1 or 2, which is provided side by side in the axial direction of the stator and the stator,
With
The stator includes a stator core having a plurality of teeth portions extending radially in the radial direction of the stator, an insulator surrounding the teeth portions, and the coil wound around the teeth portions via the insulator. And
The engaged portion is formed on the insulator.
Rotating electric machine characterized by that .

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