JP2013247715A - Stator and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator and a motor which allows for facilitation of the connection work of switching windings, and compaction of the motor.SOLUTION: First through twelfth through holes H1-H12 corresponding to first through twelfth split cores C1-C12 are formed in the bottom wall 11b of the bearing member 11 of a bus bar device 5. When viewed from the axial direction, the first through twelfth through holes H1-H12 are arranged to face the corresponding first through twelfth split cores C1-C12. Terminal pieces T formed in the first through ninth bus bars B1-B9 arranged in a holder case 12a are arranged at positions facing the start-of-lead-out and the end-of-lead-out of respective phases by the shortest distance in a radial direction. The start-of-lead-out and the end-of-lead-out of each phase do not intersect nor entangle each other, but are connected with a corresponding terminal piece T in an orderly manner.

Description

  The present invention relates to a stator and a motor.

  Various winding switching motors capable of realizing a plurality of rotation speed-torque output characteristics with one motor have been proposed (for example, Patent Documents 1 and 2). The winding switching motor has two rotation speed-torque output characteristics such as high-speed rotation / low torque rotation speed-torque output characteristics and low-speed rotation / high torque rotation speed-torque output characteristics. Since it can be easily realized, its use has attracted widespread attention.

JP-A-6-217596 JP 2011-50150 A

  By the way, in this type of winding switching motor, each phase of the stator core has a winding for high speed rotation / low torque speed-torque output characteristics, and a low speed rotation / high torque speed-torque output characteristics. Since the two types of windings for winding must be wound, the number of lead wires for these windings is very large and complicated. Therefore, when connecting these windings, a lot of lead wires entangled with each other have to be connected, and the connection work is very labor intensive. In addition, a large number of lead wires are entangled and complicated, leading to an increase in the size of the motor.

  However, the winding switching motors of Patent Documents 1 and 2 do not disclose details about the connection of the switching windings, and an easy connection structure of the outgoing lines of the switching windings is required in the winding switching motor.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to facilitate the wiring connection work, particularly the switching winding connection work, and to realize a reduction in the size of the motor. It is to provide a stator and a motor that can be used.

  The invention according to claim 1 is a stator core, a winding wound around each phase of the stator core, and a bus bar device for energizing power to the winding wound around each phase of the tooth. The bus bar device is disposed on one end side in the axial direction of the stator core, and includes a plurality of bus bars disposed concentrically with the central axis of the stator core in the radial direction, The bus bar includes a connection terminal that protrudes in the axial direction toward the anti-stator core side, and the lead wire of the winding wound around the teeth of each phase is drawn in the axial direction toward the bus bar device side, The lead wire is bent in the radial direction on the side opposite to the stator core of the bus bar device and on the bus bar side, and is connected to the connection terminal of the bus bar.

  According to the first aspect of the present invention, since the lead wire is bent toward the bus bar, the lead wire is easily bent and the diameter of the bus bar device is not increased. In addition, since the connection terminal protrudes in the axial direction, the connection with the lead wire is easy and insulation from other bus bars can be maintained.

According to a second aspect of the present invention, in the stator according to the first aspect, the connection terminal has an engaging portion that engages the lead wire in the axial direction.
According to the second aspect of the present invention, by providing the connecting portion with the engaging portion, the lead wire can be temporarily entangled with the engaging portion, and the lead wire and the connecting terminal can be easily connected. .

  A third aspect of the present invention is a motor using the stator according to the first and second aspects, wherein one or a plurality of windings wound around each tooth of the stator core form a plurality of phase windings. A plurality of phase windings wound around the teeth of each phase while forming a wire are formed from a plurality of switching phase windings having a plurality of linear rotation speed-torque output characteristics that are linear with respect to the driving torque. The bus bar device includes a winding switching bus bar that is connected to a switching circuit that switches energization between a plurality of switching phase windings, and is connected to a lead line of the winding.

According to the third aspect of the present invention, since the winding switching bus bar is used when connecting to the switching circuit, the structure becomes easy and the size of the motor can be reduced.
According to a fourth aspect of the present invention, in the motor according to the third aspect, the plurality of bus bars are provided for each phase, and the bus bar for each phase includes a power feeding bus bar and a first winding switching bus bar. And the plurality of switching phase windings, which are arranged in an annular shape adjacent to each phase and wound around the teeth of each phase. Is composed of two windings, a first winding and a second winding, respectively, and the first winding and the second winding have a leading end and a terminating portion, respectively, and the second winding has a leading end and a terminating portion, respectively. The starting end of the wire is connected to the power feeding bus bar, the terminal end of the first winding and the starting end of the second winding are connected to the first winding switching bus bar, and the second winding. The end of the wire is connected to the second winding switching bus bar.

According to the fourth aspect of the present invention, the lead lines of the switching phase windings of the respective phases can be connected to the respective bus bars at positions adjacent to each other.
According to a fifth aspect of the present invention, in the motor according to the third or fourth aspect, each connection terminal provided in the power feeding bus bar, the first winding switching bus bar, and the second winding switching bus bar of each phase. The three connection terminal pairs adjacent in the circumferential direction are provided adjacent to each other at a constant pitch in the circumferential direction, and the power feeding bus bar of the other phase and the first winding switching bus bar. And it is a connection terminal of the second winding switching bus bar, and is formed at a position that does not intersect in the radial direction with three connection terminal pairs adjacent in the circumferential direction.

  According to the fifth aspect of the present invention, the lead lines of the first winding and the second winding of each phase are drawn out in an orderly manner without intersecting each other. Then, the wiring operation from the stator core to the bus bar device can be facilitated, the space between the stator core and the bus bar device can be reduced, and the physique of the motor can be reduced.

According to a sixth aspect of the present invention, in the motor of the fifth aspect, the terminal end of the first winding and the start end of the second winding are connected to one connection terminal.
According to the sixth aspect of the present invention, since the terminal end of the first winding and the start end of the second winding are connected to one connection terminal, the windings can be easily connected.

  According to a seventh aspect of the present invention, in the motor according to the sixth aspect, the terminal end of the first winding and the start end of the second winding are connection terminals on the outer side in the circumferential direction of the three connection terminal pairs. Connected.

  According to the seventh aspect of the present invention, the two lead lines of the terminal end of the first winding and the starting end of the second winding are connected to the starting end of the first winding, the terminal end of the second winding, and the circumferential direction. In this case, it is difficult to cross and insulation is ensured.

  According to an eighth aspect of the present invention, in the motor according to any one of the third to seventh aspects, the bus bar device has a bottomed cylindrical case on one axial end side of the stator core, and the case The plurality of annular bus bars are arranged at regular intervals in the radial direction, the outer peripheral portion of the case is formed to extend radially outward, and the extended outer peripheral portion is the plurality of switching Each of the lead lines is formed in a position opposite to the lead wire of the phase winding, and each of the lead lines is inserted into the opposite through part, and then bent radially inward, It is connected to the corresponding bus bar arranged in the case.

  According to invention of Claim 8, the bus-bar apparatus which has arrange | positioned several cyclic | annular bus-bars at predetermined intervals to radial direction in the bottomed cylindrical case is the lead wire of each switching phase winding, Since the penetration part was formed in the position which mutually opposes, the leader line of each phase can be penetrated to a penetration part by the shortest distance.

  Therefore, the lead lines of the respective phases are drawn out in an orderly manner without crossing each other and being entangled. Then, the wiring operation from the stator core to the bus bar device can be facilitated, the space between the stator core and the bus bar device can be reduced, and the physique of the motor can be reduced.

  According to a ninth aspect of the present invention, in the motor according to the eighth aspect, the penetration part formed in the outer peripheral part is a penetration hole provided for each switching phase winding, The starting end and the terminal end of the winding and the second winding are inserted as lead lines.

According to the ninth aspect of the present invention, the lead wires of the first winding and the second winding of each switching phase winding can be penetrated through the corresponding insertion holes at the shortest distance.
According to a tenth aspect of the present invention, in the motor according to the eighth or ninth aspect, the plurality of bus bars arranged in the case are resin-molded with an insulating resin and are positioned and fixed.

According to the invention described in claim 10, the bus bar is firmly held by resin molding.
An eleventh aspect of the present invention is the motor according to any one of the fourth to tenth aspects, wherein the stator core is a three-phase, 12-slot, concentrated winding stator core, and each tooth of the stator core includes A first winding and a second winding are wound, and power of each phase is supplied to the power feeding bus bar of each phase. The first winding switching bus bar and the second winding of each phase The switching bus bar is provided with the switching circuit for switching to the star connection of either the first system winding or the second system winding.

  According to the eleventh aspect of the present invention, the wiring operation from the stator core to the bus bar device can be facilitated, the space between the stator core and the bus bar device can be reduced, and the physique of the motor can be reduced.

  According to the present invention, the switching winding can be easily connected and the motor can be miniaturized.

Sectional drawing of the brushless motor of this embodiment. The disassembled perspective view of the stator and motor case seen from the front side. FIG. 3 is an exploded perspective view of the bus bar device and the stator as viewed from the front side. The disassembled perspective view of the stator and motor case seen from the rear side. FIG. 3 is an exploded perspective view of the bus bar device and the stator as seen from the rear side. The perspective view of a split core. The perspective view which shows the arrangement structure of each bus bar resin-molded to the bus-bar apparatus. FIG. 4 is a development view of each bus bar, where (a) is a development view of a U-phase power supply bar, (b) is a development view of a first U-phase neutral point bar, and (c) is a development view of a second U-phase neutral point bar. , (D) is a developed view of the V-phase feeder bar, (e) is a developed view of the first V-phase neutral point bar, (f) is a developed view of the second V-phase neutral point bar, and (g) is a W-phase. FIG. 4 is a development view of the power feed bar, (h) is a development view of the first W-phase neutral point bar, and (i) is a development view of the second W-phase neutral point bar. Explanatory drawing explaining the wiring of the coil | winding wound by the division | segmentation core of each phase. The electric circuit diagram of a brushless motor. The equivalent circuit schematic of the 1st system | strain winding of a brushless motor. The equivalent circuit diagram of the 2nd system | strain winding of a brushless motor. The figure explaining the rotation speed-torque output characteristic of a brushless motor. The electric circuit diagram of the brushless motor of a 2nd embodiment. The equivalent circuit diagram of the 1st system | strain | winding of a brushless motor similarly. Similarly, the equivalent circuit diagram of the 2nd system | strain winding of a brushless motor.

Hereinafter, an embodiment in which the brassless motor of the present invention is embodied as an 8-pole 12-throttle star connection neutral point switching type brushless motor will be described with reference to FIGS.
As shown in FIG. 1, the motor case 1 of the brushless motor M has a bottomed cylindrical shape, and a large-diameter cylindrical portion 1 b is expanded and formed at the rear (reverse output) side opening of the case main body 1 a. A flange 1c is extended and formed at the rear side opening end of the large-diameter cylindrical portion 1b. Further, a through hole 1e is formed at the center position of the front wall 1d of the case body 1a.

  A cylindrical stator 2 that is press-fitted and fixed to the inner peripheral surface of the case body 1a is disposed. Inside the stator 2 is disposed a rotor 4 that is fixed to the rotary shaft 3 and rotates in the circumferential direction together with the rotary shaft 3.

  A bus bar device 5 that is press-fitted and fixed to the inner peripheral surface thereof is disposed in the large-diameter cylindrical portion 1b. And the rotating shaft 3 which fixed the rotor 4 to the bearing 6 fixed to the inner surface of the bus-bar apparatus 5 and the bearing 7 fixed to the through-hole 1e of the case main body 1a is rotatably supported.

  The stator 2 includes a substantially cylindrical stator core 8. 2 and 3, the stator core 8 has a divided stator structure, and is formed by connecting 12 divided cores C shown in FIG. As shown in FIG. 6, each divided core C includes a connecting portion 9 having an arc shape when viewed from the axial direction, and a tooth 10 that extends radially inward from a central portion in the circumferential direction of the connecting portion 9. have. The split core C is formed by laminating a predetermined number of core sheets Ca (not shown in FIG. 6) obtained by punching magnetic steel sheets into a predetermined shape by press working.

  For the convenience of explanation, when the 12 divided cores C are distinguished and specified, numbers are added after the reference numerals, which are referred to as first to twelfth divided cores C1 to C12. The cylindrical stator core 8 is formed by sequentially connecting the first to twelfth divided cores C1 to C12 in the circumferential direction.

  At this time, the first, fourth, seventh, and tenth divided cores C1, C4, C7, and C10 are referred to as a U-phase divided core C. The second, fifth, eighth, and eleventh divided cores C2, C5, C8, and C11 are referred to as V-phase divided cores C. Further, the third, sixth, ninth, and twelfth divided cores C3, C6, C9, and C12 are referred to as W-phase divided cores C. That is, three-phase cores each including three divided cores C for the U phase, V phase, and W phase are arranged in four sets in the circumferential direction. Therefore, the divided cores C of the four sets of phases are arranged at 90 degree intervals.

  As shown in FIG. 6, each U-phase split core C1, C4, C7, and C10 includes a first U-phase winding U1 as a first winding and a second U-phase winding as a second winding on a tooth 10. Two windings of U2 are wound respectively.

  A predetermined number of first U-phase windings U1 are wound around the teeth 10, and the drawing start end U1a and the drawing end U1b are drawn out to the rear side. Similarly, the second U-phase winding U2 is wound around the teeth 10 by a predetermined number, and the drawing start end U2a and the drawing end U2b are drawn out to the rear side.

  Then, the drawing start end portions U1a and U2a and the drawing end portions U1b and U2b of the first and second U-phase windings U1 and U2 drawn to the rear side are electrically connected to the bus bar device 5. . At this time, the leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are electrically connected to each other in the bus bar device 5. The leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are circumferentially outside the leading end portion U2b of the second U-phase winding U2 (on the anti-extraction starting end portion U1a side). Are arranged adjacent to each other. As a result, in the bus bar device 5, the pull-out terminal end U1b of the first U-phase winding U1 and the pull-out start end U2a of the second U-phase winding U2 that are electrically connected to each other are the pull-out start end of the first U-phase winding U1. It is difficult to cross the lead end portion U2b of U1a and the second U-phase winding U2.

  As shown in FIG. 6, each of the split cores C2, C5, C8, and C11 for V-phase includes a first V-phase winding V1 as a first winding and a second V-phase winding as a second winding. Two windings of V2 are wound respectively.

  A predetermined number of first V-phase windings V1 are wound around the teeth 10, and the drawing start end V1a and the drawing end V1b are drawn out to the rear side. Similarly, the second V-phase winding V2 is wound around the teeth 10 by a predetermined number, and the drawing start end V2a and the drawing end V2b are drawn out to the rear side.

  Then, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b of the first and second V-phase windings V1 and V2 drawn to the rear side are electrically connected to the bus bar device 5. . At this time, the leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 are electrically connected to each other in the bus bar device 5. And, the lead end portion V1b of the first V-phase winding V1 and the lead start end portion V2a of the second V-phase winding V2 are circumferentially outside the pull-out end portion V2b of the second V-phase winding V2 (on the side opposite to the pull-out start end portion V1a). Are arranged adjacent to each other. As a result, in the bus bar device 5, the leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 that are electrically connected to each other are the leading start end portion of the first V-phase winding V1. It is difficult to cross V1a and the leading end V2b of the second V-phase winding V2.

  As shown in FIG. 6, each of the W-phase split cores C3, C6, C9, and C12 includes a first W-phase winding W1 as a first winding and a second W-phase winding as a second winding. Two windings of W2 are wound respectively.

  A predetermined number of first W-phase windings W1 are wound around the teeth 10, and the drawing start end W1a and the drawing end W1b are drawn out to the rear side. Similarly, the second W-phase winding W2 is wound around the tooth 10 by a predetermined number, and its drawing start end W2a and drawing end W2b are drawn out to the rear side.

  Then, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b of the first and second W-phase windings W1 and W2 drawn to the rear side are electrically connected to the bus bar device 5. . At this time, the leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W winding W2 are electrically connected to each other in the bus bar device 5. The leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W-phase winding W2 are circumferentially outward (on the side opposite to the leading end W1a) of the leading end portion W2b of the second W-phase winding W2. Are arranged adjacent to each other. As a result, in the bus bar device 5, the pull-out terminal end W1b of the first W-phase winding W1 and the pull-out start end W2a of the second W-phase winding W2 that are electrically connected to each other are the pull-out start end of the first W-phase winding W1. It is difficult to intersect with the leading end portion W2b of W1a and the second W-phase winding W2.

  As shown in FIGS. 1, 3, and 5, a bus bar device 5 is disposed on the rear side of the stator core 8 including the first to twelfth divided cores C <b> 1 to C <b> 12. The bus bar device 5 includes a bearing holding member 11 and a bus bar holder 12. The bearing holding member 11 has a bottomed cylindrical shape, and an annular outer peripheral wall 11 a is press-fitted and fixed to an inner peripheral surface of the inner diameter surface of the large-diameter cylindrical portion 1 b of the motor case 1. The rear side bottom wall 11b of the bearing holding member 11 has a through hole 11c formed at the center thereof. A bearing 6 that rotatably supports the rotating shaft 3 is fixed in the through hole 11c.

  As shown in FIG. 3, the bottom wall 11b between the outer peripheral wall 11a and the through hole 11c of the bearing holding member 11 has twelve arcuate shapes corresponding to the twelve divided cores C1 to C12 in the circumferential direction. Through holes H1 to H12 are formed through. The twelve arc-shaped through-holes H1 to H12 are formed on the same circle with the rotation shaft 3 as the center, and are penetrated at equal intervals in the circumferential direction. The twelve arc-shaped through holes H1 to H12 are divided into the corresponding divided cores C1 to C12 with respect to the twelve divided cores C1 to C12 fixed to the case main body 1a when viewed from the axial direction. It is formed so as to face C12.

  Here, the twelve through holes H1 to H12 are opposed to the divided cores C1 to C12 to form first to twelfth through holes H1 to H12. The first, fourth, seventh, and tenth through holes H1, H4, H7, and H10 are U-phase first, fourth, seventh, and tenth divided cores C1, as viewed from the axial direction. It arrange | positions so that C4, C7, C10 may oppose.

  Therefore, the drawing start end portions U1a and U2a and the drawing end portions U1b and U2b drawn from the first divided core C1 to the rear side can be penetrated through the first through hole H1 with the shortest distance. Further, the drawing start end portions U1a and U2a and the drawing end end portions U1b and U2b drawn from the fourth divided core C4 to the rear side can be penetrated through the fourth through hole H4 at the shortest distance. Similarly, the drawing start end portions U1a and U2a and the drawing end portions U1b and U2b drawn to the rear side from the seventh divided core C7 can be penetrated through the seventh through hole H7 at the shortest distance. Furthermore, the drawing start end portions U1a and U2a and the drawing end portions U1b and U2b drawn to the rear side from the tenth divided core C10 can be penetrated through the tenth through hole H10 with the shortest distance.

  The second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 are, when viewed from the axial direction, the second, fifth, eighth, and eleventh divided cores C2, for the V phase. It arrange | positions so that C5, C8, and C11 may be opposed.

  Therefore, the drawing start end parts V1a and V2a and the drawing end parts V1b and V2b drawn from the second divided core C2 to the rear side can be penetrated through the second through hole H2 with the shortest distance. Further, the drawing start end portions V1a, V2a and the drawing end portions V1b, V2b drawn from the fifth divided core C5 to the rear side can be penetrated through the fifth through hole H5 at the shortest distance. Similarly, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b drawn to the rear side from the eighth divided core C8 can be passed through the eighth insertion hole H8 at the shortest distance. Furthermore, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b drawn to the rear side from the eleventh divided core C11 can be penetrated into the eleventh insertion hole H11 with the shortest distance.

  Further, the third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 are third, sixth, ninth, and twelfth divided cores C3 for the W phase when viewed from the axial direction. It arrange | positions so that C6, C9, and C12 may oppose.

  Therefore, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b drawn to the rear side from the third divided core C3 can be passed through the third through hole H3 at the shortest distance. Further, the drawing start end portions W1a, W2a and the drawing end portions W1b, W2b drawn from the sixth divided core C6 to the rear side can be penetrated through the sixth insertion hole H6 at the shortest distance. Similarly, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b drawn to the rear side from the ninth divided core C9 can be passed through the ninth through hole H9 with the shortest distance. Furthermore, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b drawn to the rear side from the twelfth divided core C12 can be penetrated through the twelfth through hole H12 at the shortest distance.

  As shown in FIG. 5, the bus bar holder 12 is fixed inside the outer peripheral wall 11 a of the bearing holding member 11 and inside the twelve first to twelfth through holes H <b> 1 to H <b> 12. The bus bar holder 12 is a bottomed cylindrical holder case 12a. A through hole 12c communicating with the through hole 11c of the bearing holding member 11 is formed through the bottom wall 12b. Therefore, the bus bar device 5 has a double cylinder structure in which the outer side wall 11a of the bearing holding member 11 and the holder case 12a of the bus bar holder 12 are opened on the rear side, as shown in FIGS. Yes.

In the holder case 12a, the first to ninth bus bars B1 to B9 are molded by an insulating resin J (see FIG. 1, not shown in FIG. 5).
Inside the holder case 12a, as shown in FIG. 5, first to ninth bus bars B1 to B9 are arranged at regular intervals in the radial direction, and an insulating resin J (not shown in FIG. 5). Resin molded. More specifically, as shown in FIG. 7, the holder case 12a has a first bus bar B1, a second bus bar B2, a third bus bar B3, a fourth bus bar B4, a fifth bus bar B5, and a sixth bus bar B6 from the outside. The seventh bus bar B7, the eighth bus bar B8, and the ninth bus bar B9 are arranged in this order.

  The first to third bus bars B1 to B3 are U-phase bus bars, the first bus bar B1 constitutes a power supply bus bar (power feeding bus bar), and the second bus bar B2 is a second winding switching bus bar ( The first neutral point bus bar is configured, and the third bus bar B3 is configured as a first winding switching bus bar (second neutral point bus bar).

  The fourth to sixth bus bars B4 to B6 are V-phase bus bars, the fourth bus bar B4 constitutes a power supply bus bar (power supply bus bar), and the fifth bus bar B5 is a second winding switching bus bar ( The first neutral point bus bar), and the sixth bus bar B6 constitutes a first winding switching bus bar (second neutral point bus bar).

  The seventh to ninth bus bars B7 to B9 are W-phase bus bars, the seventh bus bar B7 constitutes a power supply bus bar (power supply bus bar), and the eighth bus bar B8 is a second winding switching bus bar ( The first neutral point bus bar) and the ninth bus bar B9 constitutes a first winding switching bus bar (second neutral point bus bar).

  The first to ninth bus bars B1 to B9 are curved and formed in a circular arc shape with the central axis of the rotation shaft 3 as a concentric axis, and are arranged and resin-molded at predetermined intervals. The first to ninth bus bars B <b> 1 to B <b> 9 curved in an arc shape have lengths (length in the circumferential direction with respect to the rotation shaft 3) D <b> 1 to D <b> 9 of 270 degrees when viewed from the central axis of the rotation shaft 3 Occupy width.

  Therefore, as shown to Fig.8 (a)-(i), the length D1-D9 becomes short, so that the bus bar arrange | positioned inside the bus-bar holder 11 is. That is, the first bus bar B1, the second bus bar B2, the third bus bar B3, the fourth bus bar B4, the fifth bus bar B5, the sixth bus bar B6, the seventh bus bar B7, the eighth bus bar B8, and the ninth bus bar B9. Shorter.

  Further, the first to ninth bus bars B1 to B9 are arranged to be deviated in the circumferential direction by 10 degrees in the clockwise direction in FIG. 7 around the central axis of the rotating shaft 3 with respect to the first bus bar B1.

Further, the first to ninth bus bars B1 to B9 have four terminal pieces T formed at equal intervals on the rear side (the upper side in FIG. 8).
More specifically, each of the first to ninth bus bars B1 to B9 has terminal pieces T formed at both ends thereof, and two terminal pieces T adjacent to each other between the terminal pieces T at both ends thereof. Are arranged at equal intervals. The terminal pieces T formed on the first to ninth bus bars B1 to B9 are provided with engaging portions Ta that are recessed on the center side of the terminal piece T on both sides (only one side may be provided if necessary). Has been.

  Accordingly, when the first to ninth bus bars B1 to B9 are resin-molded in the arc shape in the bus bar holder 12, the terminal pieces T in the first to ninth bus bars B1 to B9 are in the circumferential direction of the central axis of the rotary shaft 3. Are arranged at intervals of 90 degrees around the center.

  Incidentally, the terminal pieces T of the outermost first bus bar B1 protruding from the mold resin of the holder case 12a are arranged at intervals of 90 degrees. Further, each terminal piece T of the first bus bar B1 is a position where the first, fourth, seventh, and tenth through holes H1, H4, H7, and H10 formed in the bottom wall 11b are located when viewed from the axial direction. Are arranged at positions that intersect with each other in the radial direction. And each terminal piece T of 1st bus-bar B1 is wound around the 1st, 4th, 7th, 10th division | segmentation cores C1, C4, C7, C10 for U phase which respectively correspond in the engaging part Ta. The first U-phase winding U1 is connected to the drawing start end U1a of the first U-phase winding U1 at the shortest distance.

  Further, the terminal pieces T of the second bus bar B2 inside the first bus bar B1 are arranged at intervals of 90 degrees and 10 degrees clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent first bus bar B1. Arranged biased. Further, each terminal piece T of the second bus bar B2 has a position where the first, fourth, seventh, and tenth through holes H1, H4, H7, and H10 formed in the bottom wall 11b are located when viewed from the axial direction. They are arranged at positions that intersect in the radial direction. And each terminal piece T of 2nd bus-bar B2 is wound around the 1st, 4th, 7th, 10th division | segmentation core C1, C4, C7, C10 for U phase which each corresponds in the engaging part Ta. The second end U2b of the second U-phase winding U2 is connected with the shortest distance.

  Further, the terminal pieces T of the third bus bar B3 inside the second bus bar B2 are arranged at intervals of 90 degrees, and 10 degrees clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent second bus bar B2. Arranged biased. Moreover, each terminal piece T of 3rd bus-bar B3 is a position where the 1st, 4th, 7th, 10th penetration hole H1, H4, H7, H10 formed in the bottom wall 11b is located seeing from the axial direction. Are arranged at positions that intersect with each other in the radial direction. And each terminal piece T of 3rd bus-bar B3 is wound around the 1st, 4th, 7th, 10th division | segmentation core C1, C4, C7, C10 for U phase which each corresponds in the engaging part Ta. The leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are connected at the shortest distance.

  Moreover, the leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are circumferentially outward (on the anti-leading end portion U1a side) of the leading end portion U2b of the second U-phase winding U2. Are arranged adjacent to each other.

  And three terminals adjacent in the circumferential direction by the four terminal pieces T of the first bus bar B1, the four terminal pieces T of the second bus bar B2, and the four terminal pieces T of the third bus bar B3. Four pairs are formed. The four terminal pairs are arranged at a pitch of 90 degrees. Accordingly, the four terminal pairs have positions and diameters where the corresponding first, fourth, seventh, and tenth through holes H1, H4, H7, and H10 are formed in the bottom wall 11b when viewed from the axial direction. They are arranged at positions that intersect in the direction.

  At this time, the leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are connected to the terminal piece T on the outer circumferential side in the three terminal pairs. Therefore, the leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are the leading end portion U1a of the first U-phase winding U1 and the leading end portion U2b of the second U-phase winding U2. And do not cross.

  Further, the terminal pieces T of the fourth bus bar B4 inside the third bus bar B3 are arranged at intervals of 90 degrees and 10 degrees clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent third bus bar B3. Arranged biased. Further, each terminal piece T of the fourth bus bar B4 is a position where the second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 formed in the bottom wall 11b are located when viewed from the axial direction. Are arranged at positions that intersect with each other in the radial direction. Then, each terminal piece T of the fourth bus bar B4 is wound around the corresponding V-phase second, fifth, eighth, and eleventh divided cores C2, C5, C8, and C11 at the engaging portion Ta. The first V-phase winding V1 is connected to the drawing start end V1a at the shortest distance.

  Furthermore, the terminal pieces T of the fifth bus bar B5 inside the fourth bus bar B4 are arranged at intervals of 90 degrees and 10 degrees clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent fourth bus bar B4. Arranged biased. Further, each terminal piece T of the fifth bus bar B5 has positions of second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 formed in the bottom wall 11b in the direction as viewed from the axial direction. It is arrange | positioned at the position which cross | intersects in the radial direction and the position to perform. And each terminal piece T of 5th bus-bar B5 is wound around the 2nd, 5th, 8th, 11th division | segmentation cores C2, C5, C8, C11 for V phase each in the engaging part Ta. The second V-phase winding V2 is connected to the leading end portion V2b of the second V-phase winding V2 at the shortest distance.

  Similarly, the terminal pieces T of the sixth bus bar B6 inside the fifth bus bar B5 are arranged at an interval of 90 degrees and are 10 clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent fifth bus bar B5. It is arranged with a bias. Further, the terminal pieces T of the sixth bus bar B6 are positions where the second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 formed in the bottom wall 11b are located when viewed from the axial direction. Are arranged at positions that intersect with each other in the radial direction. Then, each terminal piece T of the sixth bus bar B6 is wound around the corresponding V-phase second, fifth, eighth, and eleventh divided cores C2, C5, C8, and C11 at the engaging portion Ta. The first and second V-phase windings V1 and V2 of the first V-phase winding V1 and the second V-phase winding V2 are connected to each other at the shortest distance.

  In addition, the leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 are outside in the circumferential direction of the leading end portion V2b of the second V-phase winding V2 (on the side opposite to the leading end V1a). Are arranged adjacent to each other.

  And three terminals adjacent in the circumferential direction by the four terminal pieces T of the fourth bus bar B4, the four terminal pieces T of the fifth bus bar B5, and the four terminal pieces T of the sixth bus bar B6 Four pairs are formed. The four terminal pairs are arranged at a pitch of 90 degrees. Accordingly, the four terminal pairs have positions and diameters where the corresponding second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 are formed in the bottom wall 11b when viewed from the axial direction. They are arranged at positions that intersect in the direction.

  At this time, the leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 are connected to the terminal piece T on the outer circumferential side in the three terminal pairs. Accordingly, the leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 are the leading end portion V1a of the first V-phase winding V1 and the leading end portion V2b of the second V-phase winding V2. And do not cross.

  Further, the terminal pieces T of the seventh bus bar B7 inside the sixth bus bar B6 are arranged at intervals of 90 degrees and 10 degrees clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent sixth bus bar B6. Arranged biased. Further, the terminal pieces T of the seventh bus bar B7 are positions where the third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 formed in the bottom wall 11b are located when viewed from the axial direction. Are arranged at positions that intersect with each other in the radial direction. Then, each terminal piece T of the seventh bus bar B7 is wound around the corresponding third, sixth, ninth, and twelfth divided cores C3, C6, C9, and C12 for the W phase at the engaging portion Ta. The first W-phase winding W1 is connected to the drawing start end W1a at the shortest distance.

  Further, the terminal pieces T of the eighth bus bar B8 inside the seventh bus bar B7 are arranged at intervals of 90 degrees and 10 degrees clockwise in FIG. 7 with respect to the terminal pieces T of the adjacent seventh bus bar B7. Arranged biased. Further, each terminal piece T of the eighth bus bar B8 is a position where the third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 formed in the bottom wall 11b are located when viewed from the axial direction. Are arranged at positions that intersect with each other in the radial direction. Then, each terminal piece T of the eighth bus bar B8 is wound around the corresponding third, sixth, ninth, and twelfth divided cores C3, C6, C9, and C12 for the W phase at the engaging portion Ta. The second end W2b of the second W-phase winding W2 is connected with the shortest distance.

  Similarly, each terminal piece T of the ninth bus bar B9 inside the eighth bus bar B8 is arranged at an interval of 90 degrees and is 10 clockwise in FIG. 7 with respect to the terminal piece T of the adjacent eighth bus bar B8. It is arranged with a bias. Further, the terminal pieces T of the ninth bus bar B9 are positions where the third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 formed in the bottom wall 11b are located when viewed from the axial direction. Are arranged at positions that intersect with each other in the radial direction. Then, each terminal piece T of the ninth bus bar B9 is wound around the corresponding third, sixth, ninth, and twelfth divided cores C3, C6, C9, and C12 at the engaging portion Ta. The leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W-phase winding W2 are connected at the shortest distance.

  Moreover, the leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W-phase winding W2 are circumferentially outward (on the anti-extraction starting end portion W1a side) of the leading end portion W2b of the second W-phase winding W2. Are arranged adjacent to each other.

  And three terminals adjacent in the circumferential direction by the four terminal pieces T of the seventh bus bar B7, the four terminal pieces T of the eighth bus bar B8, and the four terminal pieces T of the ninth bus bar B9 Four pairs are formed. The four terminal pairs are arranged at a pitch of 90 degrees. Accordingly, the four terminal pairs have positions and diameters where the corresponding third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 are formed in the bottom wall 11b when viewed from the axial direction. They are arranged at positions that intersect in the direction.

  At this time, the leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W-phase winding W2 are connected to the terminal piece T on the outer side in the circumferential direction in three terminal pairs. Therefore, the leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W-phase winding W2 are the leading end portion W1a of the first W-phase winding W1 and the leading end portion W2b of the second W-phase winding W2. And do not cross.

  By the way, the first to ninth bus bars B1 to B9 are formed by punching a copper plate together with the terminal piece T having the engaging portion Ta by a press machine or the like. And when 1st-9th bus-bar B1-B9 is molded with resin J in the holder case 12a, each terminal piece T protrudes to the rear side from mold resin.

  A circuit board 20 is fixed to a rear side surface of the bottom wall 11b formed in the bearing holding member 11 so as to surround the through hole 11c, and the rotation axis 3 (rotor 4) rotates on the circuit board 20. A plurality of rotation sensors 21 for detecting the position are mounted. The plurality of rotation sensors 21 detect rotation passing of the detection plate 22 fixed to the rotation shaft 3. As shown in FIG. 3, the signal line 23 of the rotation sensor 21 mounted on the circuit board 20 is a signal line formed by penetrating at positions adjacent to the through holes H <b> 1 to H <b> 12 formed in the bottom wall 11 b of the bearing holding member 11. As shown in FIG. 5, it is drawn out between the bearing holding member 11 and the holder case 12a through the through hole Ha.

  Next, the drawing start end portions U1a and U2a of the first and second windings of the respective phases wound around the terminal pieces T of the first to ninth bus bars B1 to B9 and the first to twelfth divided cores C1 to C12. The connection of W1a, W2a and the drawer termination portions U1b, U2b to W1b, W2b will be described.

  A bearing holding member 11 provided with a bus bar holder 12 is disposed opposite to the substantially cylindrical stator core 8 including the first to twelfth divided cores C1 to C12 on the rear side. At this time, the bearing holding member 11 has the first, fourth, seventh, and tenth through holes H1, H4, H7, and H10 for the U phase as viewed from the axial direction. The seventh and tenth divided cores C1, C4, C7, and C10 are arranged to face each other.

  Accordingly, the second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 for the V phase have the second, fifth, and eighth phases for the V phase as viewed from the axial direction. And the eleventh divided cores C2, C5, C8, and C11.

  Similarly, the third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 for the W phase are third, sixth, ninth, and ninth for the W phase as viewed from the axial direction. It arrange | positions so that 12 division | segmentation cores C3, C6, C9, and C12 may be opposed.

  Next, the first and second U-phase windings U1, U2 (drawing start end portions U1a, U2a and drawing end portions U1b, U2b) wound around the U-phase split cores C1, C4, C7, C10, respectively, Insert into the corresponding through holes H1, H4, H7, H10 respectively and pull out to the rear side.

  Therefore, the drawing start end portions U1a, U2a and the drawing end portions U1b, U2b drawn from the U-phase split cores C1, C4, C7, C10 are respectively inserted into the corresponding U-phase through holes H1, H4, H7, It is pulled out to the rear side through the shortest distance through H10.

  Similarly, the first and second V-phase windings V1 and V2 (drawing start end portions V1a and V2a and drawing termination end portions V1b and V2b) wound around the V-phase split cores C2, C5, C8, and C11, respectively, Insert into the corresponding through holes H2, H5, H8, H11, respectively, and pull out to the rear side.

  Accordingly, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b drawn from the V-phase divided cores C2, C5, C8, and C11 are respectively inserted into the corresponding V-phase through holes H2, H5, H8, It is pulled out to the rear side through the shortest distance through H11.

  Similarly, the first and second W windings W1 and W2 (drawing start end portions W1a and W2a and lead end portions W1b and W2b) wound around the divided cores C3, C6, C9, and C12 for the W phase are respectively provided. Insert into the corresponding through holes H3, H6, H9, H12 and pull out to the rear side.

  Accordingly, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b drawn from the W-phase divided cores C3, C6, C9, and C12 are respectively inserted into the corresponding W-phase insertion holes H3, H6, H9, It is pulled out to the rear side at the shortest distance via H12.

  Next, the drawing start end portions U1a, U2a and the drawing end portions U1b, U2b drawn from the U-phase split cores C1, C4, C7, C10 are bent inward in the radial direction. And the front-end | tip of the drawer | drawing-out start-end part U1a bent in the radial direction inner side is entangled with the engaging part Ta of the terminal piece T for U-phase electric power feeding of 1st bus-bar B1, and is welded and electrically joined to the terminal piece T. Next, the leading end of the leading end portion U2b bent inward in the radial direction is entangled with the engaging portion Ta of the U-phase terminal piece T of the second bus bar B2, and welded and electrically joined to the terminal piece T. Furthermore, the leading ends of the leading end portion U1b and the leading end portion U2a bent inward in the radial direction are entangled with the engaging portion Ta of the U-phase terminal piece T of the third bus bar B3, and are welded to the terminal piece T to be electrically connected. To join.

  At this time, the insertion holes H1, H4, H7, and H10 for the U phase are at positions that intersect the terminal pieces T of the first to third bus bars B1 to B3 for the U phase in the radial direction. Thereby, the drawing start end portions U1a and U2a and the drawing end portions U1b and U2b are on the radial extension lines of the terminal pieces T of the respective bus bars B1 to B3.

  As a result, each drawing start end U1a is joined to the corresponding terminal piece T of the first bus bar B1 at the shortest distance. In addition, each drawer termination portion U2b is also joined to the corresponding terminal piece T of the second bus bar B2 at the shortest distance. Furthermore, each drawer terminal end portion U1b and each drawer start end portion U2a are also joined to the corresponding terminal piece T of the third bus bar B3 at the shortest distance.

  Similarly, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b drawn from the V-phase split cores C2, C5, C8, and C11 are bent inward in the radial direction. And the front-end | tip of the drawer | drawing-out start-end part V1a bent in the radial direction inner side is entangled with the engaging part Ta of the terminal piece T for V-phase electric power feeding of 4th bus-bar B4, and the terminal piece T is welded and electrically joined. Next, the leading end of the leading end portion V2b bent radially inward is entangled with the engaging portion Ta of the V-phase terminal piece T of the fifth bus bar B5, and is welded and electrically joined to the terminal piece T. Further, the leading ends of the leading end portion V1b and the leading end portion V2a bent radially inward are entangled with the engaging portion Ta of the V-phase terminal piece T of the sixth bus bar B6 and welded to the terminal piece T to be electrically connected. To join.

  At this time, the V-phase through holes H2, H5, H8, and H11 are at positions that intersect the terminal pieces T of the V-phase fourth to sixth bus bars B4 to B6 in the radial direction. Accordingly, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b are on the radial extension lines of the terminal pieces T of the respective bus bars B4 to B6.

  As a result, each drawing start end V1a is joined to the corresponding terminal piece T of the fourth bus bar B4 at the shortest distance. In addition, each drawer termination portion V2b is also joined to the corresponding terminal piece T of the fifth bus bar B5 at the shortest distance. Furthermore, each drawer termination portion V1b and each drawer start end portion V2a are also joined to the corresponding terminal piece T of the sixth bus bar B6 at the shortest distance.

  Similarly, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b drawn from the W-phase split cores C3, C6, C9, and C12 are bent inward in the radial direction. And the front-end | tip of the drawer | drawing-out start end part W1a bent in the radial inside is entangled with the engaging part Ta of the terminal piece T for W-phase power feeding of the seventh bus bar B7, and is welded and electrically joined to the terminal piece T. Next, the leading end of the leading end portion W2b bent radially inward is entangled with the engaging portion Ta of the W-phase terminal piece T of the eighth bus bar B8, and is welded and electrically joined to the terminal piece T. Further, the leading end of the leading end W1b and the leading end W2a bent inward in the radial direction are entangled with the engaging portion Ta of the W-phase terminal piece T of the ninth bus bar B9 and welded to the terminal piece T for electrical connection. To join.

  At this time, the through holes H3, H6, H9, and H12 for the W phase are in positions that intersect the terminal pieces T of the seventh to ninth bus bars B7 to B9 for the W phase in the radial direction. Accordingly, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b are on the radial extension lines of the terminal pieces T of the respective bus bars B7 to B9.

  As a result, each drawer start end W1a is joined to the corresponding terminal piece T of the seventh bus bar B7 at the shortest distance. In addition, each drawer termination portion W2b is also joined to the corresponding terminal piece T of the eighth bus bar B8 at the shortest distance. Furthermore, each drawer termination portion W1b and each drawer start end portion W2a are also joined to the corresponding terminal piece T of the ninth bus bar B9 at the shortest distance.

  Incidentally, in FIG. 9, the drawing start end portions U1a, U2a to W1a and W2a of the first and second windings of the respective phases of the bus bars B1 to B9 and the divided cores C1 to C12 and the drawing end portions U1b, U2b to W1b, The connection aspect of W2b is shown.

  As shown in FIG. 1, a rotor 4 is provided inside the stator 2. The rotor 4 has a rotor core 30 fixed to the rotary shaft 3. The rotor core 30 is generated by laminating and fixing a plurality of core pieces 30a in the axial direction. The outer surface of the rotor core 30 is a rotor having a so-called IPM (Interior Permanent Magnet) structure in which eight permanent magnets (not shown) fixed in the axial direction on the outer surface are embedded in the circumferential direction. The eight permanent magnets are oriented so that their magnetic poles are oriented differently from adjacent permanent magnets. Then, the rotor 4 is rotated by the rotating magnetic field generated by the stator 2.

A disc-shaped cover 32 is attached to the flange 1 c formed at the opening end of the large-diameter cylindrical portion 1 b of the motor case 1 to close the rear-side opening of the motor case 1.
A through hole 33 is formed through the center of the cover 32. In the through hole 33, the signal lines 23 of the plurality of rotation sensors 21 drawn out from the signal line through hole Ha formed in the bottom wall 11b of the holding member 11 are drawn out.

  Moreover, nine 1st-9th electric power lines L1-L9 corresponding to 1st-9th bus-bar B1-B9 are inserted in the penetration hole 33. FIG. And the front-end | tip of nine 1st-9th electric power lines L1-L9 inserted in the penetration hole 33 is joined with one terminal piece T of 1st-9th bus-bar B1-B9 corresponding, respectively.

  That is, as shown in FIG. 9, the first power line L1 is connected to the terminal piece T of the first bus bar B1 for U-phase power feeding. Second power line L2 is connected to terminal piece T of U-phase second winding switching second bus bar B2. The third power line L3 is connected to the terminal piece T of the third bus bar B3 for switching the U-phase first winding.

  The fourth power line L4 is connected to the terminal piece T of the fourth bus bar B4 for V-phase power feeding. The fifth power line L5 is connected to the terminal piece T of the fifth bus bar B5 for switching the V-phase second winding. The sixth power line L6 is connected to the terminal piece T of the sixth bus bar B6 for switching the V-phase first winding.

  Similarly, the seventh power line L7 is connected to the terminal piece T of the seventh bus bar B7 for W-phase power feeding. The eighth power line L8 is connected to the terminal piece T of the W-phase second winding switching eighth bus bar B8. The ninth power line L9 is connected to the terminal piece T of the ninth bus bar B9 for switching the W-phase first winding.

  The signal line 23 and the first to ninth power lines L1 to L9 drawn out from the through hole 33 are connected to a driving device 35 accommodated in the control box 34 attached to the cover 32, and are brushless. The motor M is driven and controlled.

  Next, the electrical configuration of the brushless motor M will be described with reference to FIG. The electrical configuration of the windings of one set of U-phase, V-phase, and W-phase split cores C is the electrical configuration of the windings of the other three sets of U-phase, V-phase, and W-phase split cores C. It is the same composition as. Therefore, for convenience of explanation, the electrical configuration of the windings of one set of U-phase, V-phase, and W-phase split cores C (first to third split cores C1 to C3) will be described.

  As shown in FIG. 10, the lead-out starting end U1a of the first U-phase winding U1 of the first split core C1 is connected to the power receiving terminal Tu via the first bus bar B1, and the U-phase power supply voltage Vu is input. The The leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 of the first split core C1 are connected via the third bus bar B3 (third power line L1) and the first switching element Q1. Connected to the second neutral line NL2. The leading end portion U2b of the second U-phase winding U2 of the first split core C1 is connected to the first neutral line NL1 via the second bus bar B2 (second power line L2) and the second switching element Q2.

  The lead start end V1a of the first V-phase winding V1 of the second split core C2 is connected to the power receiving terminal Tv via the fourth bus bar B4, and the V-phase power supply voltage Vv is input thereto. The leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 of the second split core C2 are connected via the sixth bus bar B6 (sixth power line L6) and the third switching element Q3. Connected to the second neutral line NL2. The lead terminal V2b of the second V-phase winding V2 of the second split core C2 is connected to the first neutral line NL1 via the fifth bus bar B5 (fifth power line L5) and the fourth switching element Q4.

  The lead start end W1a of the first W-phase winding W1 of the third split core C3 is connected to the power receiving terminal Tw via the seventh bus bar B7, and the W-phase power supply voltage Vw is input thereto. The leading end portion W1b of the first W-phase winding W1 and the leading end portion W2a of the second W winding W2 of the third split core C3 are connected via the ninth bus bar B9 (the ninth power line L9) and the fifth switching element Q5. 2 is connected to the neutral line NL2. The lead terminal W2b of the second W winding W2 of the third split core C3 is connected to the first neutral line NL1 via the eighth bus bar B8 (eighth power line L8) and the sixth switching element Q6.

  The first to sixth switching elements Q1 to Q6 are formed of an N channel MOS transistor with a body diode D, the drain terminal is connected to the corresponding winding side, and the source terminal is connected to the corresponding neutral line. . The first to sixth drive signals CT1 to CT6 are input to the gate terminals of the first to sixth switching elements Q1 to Q6, respectively. The first to sixth switching elements Q1 to Q6 are turned on when the H-level first to sixth drive signals CT1 to CT6 are input, respectively, and the L-level first to sixth phase drive signals CT1 to CT6. Is turned off when is entered.

  Accordingly, the second, fourth and sixth switching elements Q2, Q4 and Q6 are all turned off, and the first, third and fifth switching elements Q3, Q3 and Q5 are turned on at a predetermined timing. Thus, the winding structure of the motor M is such that the U phase is the first U phase winding U1, the V phase is the first V phase winding V1, and the W phase is the star of the first system winding S1 including the first W phase winding W1. It becomes a connection. FIG. 11 shows an equivalent circuit thereof.

  On the other hand, the first, third, and fifth switching elements Q1, Q3, and Q5 are all turned off, and the second, fourth, and sixth switching elements Q2, Q4, and Q6 are turned on at a predetermined timing. Thus, the winding structure of the motor M is such that the U phase is a series circuit of the first and second U phase windings U1 and U2, the V phase is a series circuit of the first and second V phase windings V1 and V2, and the W phase is This is a star connection of the second system winding S2 composed of a series circuit of the first and second W-phase windings W1 and W2. FIG. 12 shows an equivalent circuit thereof.

That is, the winding of the brushless motor M is switched by the on / off control of the first to sixth switching elements Q1 to Q6.
Incidentally, when the brushless motor M is driven by the equivalent circuit shown in FIG. 11, the brushless motor M has a rotational speed-torque output characteristic (NT output characteristic) of a high-speed rotation low torque output characteristic line NT1 shown by a solid line in FIG. ) Is driven.

  Further, when the motor M is driven by the equivalent circuit shown in FIG. 12, the brushless motor M has a rotational speed-torque output characteristic (NT output characteristic) of a low-speed rotation high torque output characteristic line NT2 shown by a solid line in FIG. Drive according to.

  Therefore, when the driving force corresponding to the load requirement characteristic line NT3 shown by the broken line in FIG. 13 is required for the brushless motor M (rotating shaft 3), this can be achieved by switching the winding of the brushless motor M.

  More specifically, in FIG. 13, an intersection where the high speed rotation low torque output characteristic line NT1 and the low speed rotation high torque output characteristic line NT2 intersect is defined as a switching point Px. Further, the rotational torque Tn of the motor M corresponding to the switching point Px is set as the switching torque Tx. Further, in the range in which the brushless motor M can output, a torque region less than the switching torque Tx is referred to as a first torque region Z1, and a torque region greater than the switching torque Tx is referred to as a second torque region Z2.

  In FIG. 13, the rotation torque Tn of the rotation of the brushless motor M corresponding to the first point P1 of the “low torque high speed rotation” of the load requirement characteristic line NT3 is set as the minimum torque Tmin, and the second of the “high torque low speed rotation”. The rotational torque Tn of the brushless motor M corresponding to the point P2 is set as the maximum torque Tmax.

  Further, the high-speed rotation low torque output characteristic line NT1 is used when the brushless motor M is driven using the rotation speed-torque output characteristic of the high-speed rotation low torque output characteristic line NT1. Both sides are set so as to intersect with the load requirement characteristic line NT3.

  Similarly, when the brushless motor M is driven using the rotation speed-torque output characteristic of the low-speed rotation high torque output characteristic line NT2, the low-speed rotation high torque output characteristic line NT2 is also the low-speed rotation high torque output characteristic line NT2. The both sides of NT2 are set so as to intersect the load requirement characteristic line NT3.

  Further, the brushless motor M has a high speed rotation low torque output characteristic line NT1 and a low speed rotation so that a switching point Px where the high speed rotation low torque output characteristic line NT1 and the low speed rotation high torque output characteristic line NT2 intersect is as follows. A high torque output characteristic line NT2 is set.

Here, in FIG. 13, the output characteristic line of the rotational speed-torque output characteristic connecting the first point P1 and the second point P2 of the load requirement characteristic line NT3 with a straight line is defined as a virtual output characteristic line NTx.
The switching point Px is an orthogonal line NTxa that is orthogonal to the virtual output characteristic line NTx and is set to exist on the orthogonal line NTxa that is farthest from the load request characteristic line NT3.

  In order to satisfy these conditions, the first U-phase winding U1, the first V-phase winding V1, the first W-phase winding W1, the second U-phase winding U2, the second V-phase winding V2, and the second The number of turns of the 2W phase winding W2, the thickness of the winding, and the like are set in advance through experiments, tests, and the like.

  In order for the brushless motor M to correspond to the required load characteristic line NT3 indicated by the broken line in FIG. 13, when the brushless motor M is in the first torque region Z1, the brushless motor M is driven at high speed and low torque. Further, when in the second torque region Z2, the brushless motor M may be driven at a low speed and high torque.

  More specifically, when in the first torque region Z1, the brushless motor M is set to the equivalent circuit shown in FIG. 11, and the NT output characteristic is driven according to the high-speed rotation low torque output characteristic line NT1 shown in FIG. When in the second torque region Z2, the brushless motor M is driven in accordance with the equivalent circuit shown in FIG. 12, and the NT output characteristic is driven according to the low-speed rotation high torque output characteristic line NT2 shown in FIG.

As a result, the brushless motor M has a characteristic that its NT output characteristic is most approximate to the load requirement characteristic line NT3 indicated by the broken line in FIG.
The drive device 35 housed in the control box 34 has an ECU (electronic control unit) 40. The ECU 40 is composed of a microcomputer, and receives a command signal CNT from an external device (not shown), and drives and controls the brushless motor M based on the command signal CNT.

  The ECU 40 is connected to a plurality of rotation sensors 21 and to a torque sensor 41. The rotation sensor 21 detects the rotation speed N at that time, and outputs a rotation speed detection signal SGN to the ECU 40. The torque sensor 41 detects the current rotational torque Tn applied to the rotating shaft 3 of the brushless motor M, and outputs a torque detection signal SGT to the ECU 40.

  Then, the ECU 40 calculates the rotational speed N of the motor M at that time based on the rotational speed detection signal SGN at that time input from the rotation sensor 21. Further, the ECU 40 calculates the rotational torque Tn at that time based on the torque detection signal SGT at that time input from the torque sensor 41.

The ECU 40 determines whether the calculated rotational torque Tn belongs to the first torque region Z1 or the second torque region Z2.
When the calculated rotational torque Tn is in the first torque region Z1, the ECU 40 turns the windings of the brushless motor M to drive the brushless motor M based on the high-speed rotation low torque output characteristic line NT1. The equivalent circuit shown in FIG. That is, the ECU 40 turns off the second, fourth and sixth switching elements Q2, Q4 and Q6.

  Then, the ECU 40 turns on the first, third and fifth switching elements Q1, Q3, Q5 at a predetermined timing. Accordingly, the brushless motor M is configured such that a rotating magnetic field is generated by energizing the first U, first V, and first W-phase windings U1, V1, and W1.

  Further, when the calculated rotational torque Tn is in the second torque region Z2, the ECU 40 winds the brushless motor M to drive the brushless motor M based on the NT output characteristic based on the low-speed rotational high torque output characteristic line NT2. The line is the equivalent circuit shown in FIG. That is, the ECU 40 turns off the first, third, and fifth switching elements Q1, Q3, Q5. L level first, third and fifth drive signals CT1, CT3, CT5 are output to the terminals.

  Then, the ECU 40 turns on the second, fourth, and sixth switching elements Q2, Q4, Q6 at a predetermined timing. As a result, the brushless motor M is energized with the first U, first V and first W phase windings U1, V1, W1, and the second U, second V and second W phase windings U2, V2, W2 to rotate the magnetic field. Is generated.

Next, the operation of the brushless motor M configured as described above will be described.
Now, the stator 2 is disposed in the case body 1a. At this time, each of the U-phase split cores C1, C4, C7, and C10 in which the two windings of the first U-phase winding U1 and the second U-phase winding U2 are wound, and the leading start end portions U1a and U2a and the leading ends It arrange | positions so that terminal part U1b, U2b may be pulled out to the bus-bar apparatus 5 side in a rear side.

  Similarly, each of the V-phase split cores C2, C5, C8, and C11 in which two windings of the first V-phase winding V1 and the second V-phase winding V2 are wound, and the leading start end portions V1a, V2a and the lead The terminal portions V1b and V2b are arranged so as to be drawn out to the bus bar device 5 side on the rear side.

  Similarly, each of the split cores C3, C6, C9, and C12 for W-phase, in which two windings of the first W-phase winding W1 and the second W-phase winding W2 are wound, is provided with its leading start end portions W1a, W2a and The drawer end portions W1b and W2b are arranged so as to be drawn out to the bus bar device 5 side on the rear side.

  The bus bar device 5 disposed on the rear side so as to face the stator 2 has twelve through-holes corresponding to the twelve divided cores C1 to C12 in the bottom wall 11b of the bearing member 11 constituting the bus bar device 5. H1 to H12 are formed through.

  The first, fourth, seventh, and tenth through holes H1, H4, H7, and H10 are viewed from the axial direction, and the first, fourth, seventh, and tenth divided cores C1, U1 are used. The bus bar device 5 is arranged so as to face C4, C7, and C10. Thus, the second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 are uniquely defined in the second direction, the fifth, the eighth, and the eighth for the V phase when viewed from the axial direction. The 11-divided cores C2, C5, C8, and C11 are arranged to face each other. Similarly, the third, sixth, ninth, and twelfth through holes H3, H6, H9, and H12 have third, sixth, ninth, and twelfth divided cores C3 for the W phase as viewed from the axial direction. , C6, C9, and C12.

  Accordingly, the U-phase extraction start end portions U1a and U2a and the extraction termination end portions U1b and U2b drawn from the first, fourth, seventh, and tenth divided cores C1, C4, C7, and C10 to the rear side are first and shortest. The fourth, seventh and tenth through holes H1, H4, H7 and H10 can be penetrated. Similarly, the V-phase lead start ends V1a and V2a and the lead end portions V1b and V2b drawn from the second, fifth, eighth, and eleventh divided cores C2, C5, C8, and C11 to the rear side are arranged at the shortest distance. The second, fifth, eighth, and eleventh through holes H2, H5, H8, and H11 can be penetrated. The third, sixth, ninth, and twelfth divided cores C3, C6, C9, and C12 are connected to the W-phase extraction start ends W1a and W2a and the extraction end portions W1b and W2b with the shortest distance. The sixth, ninth, and twelfth through holes H3, H6, H9, and H12 can be penetrated.

  And each extraction | drawer start end part U1a, U2a, ..., W1a, W2a of the U phase of the 1st-12th division | segmentation cores C1-C12 which penetrated the 1st-12th penetration holes H1-H12, and the W phase. And, the drawing end portions U1b, U2b,..., W1b, W2b are drawn into the bearing holding member 11.

  Next, each of the U-phase, V-phase, and W-phase extraction start ends U1a, U2a,..., W1a, W2a and the extraction end portions U1b, U2b-W1b, W2b are radially inward holder cases 12a of the bus bar holder 12. Folded to the side.

  At this time, the terminal pieces T formed on the first to ninth bus bars B1 to B9 are provided with U-phase, V-phase, and W-phase extraction start end portions U1a, U2a, ..., W1a, W2a and extraction end portions U1b, U2b, ˜, W1b, W2b are arranged at positions facing the shortest distance in the radial direction.

  Therefore, each of the U-phase, V-phase, and W-phase lead start ends U1a, U2a,..., W1a, W2a and the lead end portions U1b, U2b,..., V2b, W1b, W2b are engaged portions of the corresponding terminal pieces T. Connected to Ta at the shortest distance.

  Next, the tips of the nine first to ninth power lines L1 to L9 are connected to one terminal piece T of the corresponding first to ninth bus bars B1 to B9, respectively. Then, by pulling out the first to ninth power lines L1 to L9 from the through hole 33 of the cover 32 together with the signal line 23 of the rotation sensor 21, the assembly of the winding-switching brushless motor M is completed.

Next, the effect of the said embodiment is described below.
(1) According to the present embodiment, the first to twelfth through holes H1 to H12 are formed through the bottom wall 11b of the bearing member 11 of the bus bar device 5 corresponding to the first to twelfth divided cores C1 to C12. did. And the bus-bar apparatus 5 is arrange | positioned with respect to the stator core 8 so that the 1st-12th penetration holes H1-H12 may face the corresponding 1st-12th division | segmentation cores C1-C12 seeing from an axial direction. did.

  Accordingly, the drawing start end portions U1a, U2a,..., W1a, W2a and the drawing end portions U1b, U2b,..., W1b, WS2b of the respective phases drawn from the first to twelfth divided cores C1 to C12 to the rear side are shortest. The first through twelfth through holes H1 through H12 can be penetrated. As a result, the drawing start end portions U1a, U2a,..., W1a, W2a and the drawing end portions U1b,..., V2b, W1b, WS2b of each phase are pulled out in an orderly manner without crossing each other.

  As a result, the wiring operation from the stator core 8 to the bus bar device 5 is facilitated, the space between the stator core 8 and the bus bar device 5 can be reduced, and the stator 2 can be miniaturized. As a result, the physique of the brushless motor M can be reduced. Further, since the connection is made with the shortest distance, the waste of the winding can be reduced.

  (2) According to the present embodiment, the first to ninth bus bars B1 to B9 are resin-molded on the holder case 12a. Then, the terminal pieces T of the first to ninth bus bars B1 to B9 are connected to the respective extraction start end portions U1a, U2a,..., W1a, W2a and the extraction end portions U1b, U2b,. They were arranged and formed at positions facing each other at the shortest distance in the radial direction.

  Therefore, each drawing start end U1a, U2a,..., V2a, W1a, W2a and each drawing termination end U1b, U2b,..., W1b, W2b of each phase are connected to the corresponding terminal piece T at the shortest distance. As a result, the drawing start end portions U1a, U2a,..., W1a, W2a and the drawing end portions U1b,..., V2b, W1b, WS2b of each phase are connected to the corresponding terminal pieces T without intersecting each other.

  This facilitates the wiring and connection work from the radially inward bending position to the terminal piece T and reduces the space on the rear side and the radial side of the bus bar device 5, further increasing the size of the brushless motor M. Can be small. Further, since the wires are connected at the shortest distance, the winding waste can be further reduced.

  (3) According to the present embodiment, the leading end portion U1b of the first U-phase winding U1 and the leading end portion U2a of the second U-phase winding U2 are arranged outside in the circumferential direction of the leading end portion U2b of the second U-phase winding U2. It arrange | positioned so that it may mutually adjoin on the (anti-drawing start edge part U1a side). And the drawer | drawer termination | terminus part U1b and the drawer | drawer start end part U2a were connected with the terminal piece T of the circumferential direction outer side in three terminal pairs of 1st-3rd bus-bar B1-B3. Accordingly, the drawing termination end portion U1b and the drawing start end portion U2a do not intersect with the drawing start end portion U1a of the first U-phase winding U1 and the drawing termination end portion U2b of the second U-phase winding U2, thereby ensuring insulation.

  Similarly, the leading end portion V1b of the first V-phase winding V1 and the leading end portion V2a of the second V-phase winding V2 are arranged on the outer side in the circumferential direction of the leading end portion V2b of the second V-phase winding V2 (on the side opposite to the leading end V1a). ) Are arranged next to each other. And the drawer | drawing termination | terminus part V1b and the drawer | drawing-out start part V2a were connected with the terminal piece T of the circumferential direction outer side in three terminal pairs of 4th-6th bus-bar B4-B6. Accordingly, the drawing termination end portion V1b and the drawing start end portion V2a do not intersect with the drawing start end portion V1a of the first V-phase winding V1 and the drawing termination end portion V2b of the second V-phase winding V2, thereby ensuring insulation.

  Further, the lead end portion W1b of the first W-phase winding W1 and the pull-out start end portion W2a of the second W-phase winding W2 are arranged on the outer side in the circumferential direction of the pull-out end portion W2b of the second W-phase winding W2 (on the anti-drawing start end portion W1a side). And arranged adjacent to each other. And the drawer | drawer termination | terminus part W1b and the drawer | drawer start end part W2a were connected with the terminal piece T of the circumferential direction outer side in three terminal pairs of 7th-9th bus-bar B7-B9. Accordingly, the drawing termination end portion W1b and the drawing start end portion W2a do not intersect the drawing start end portion W1a of the first W-phase winding W1 and the drawing termination end portion W2b of the second W-phase winding W2, thereby ensuring insulation.

  (4) According to this embodiment, the engaging portion Ta is formed on each terminal piece T of the first to ninth bus bars B1 to B9. Then, the respective drawing start end portions U1a, U2a,..., V2a, W1a, W2a and the drawing end portions U1b, U2b,..., W1b, W2b of the respective phases corresponding to the respective engaging portions Ta can be temporarily fixed. I made it. Therefore, the operation of welding and electrically connecting the lead start end portions U1a, U2a,..., V2a, W1a, W2a and the lead end portions U1b, U2b,. Can be carried out very easily.

  (5) According to this embodiment, the first to ninth bus bars B1 to B9 arranged in the holder case 12a are resin-molded with the insulating resin J, so that the first to ninth bus bars B1 to B9 are strengthened. Can be held.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
The present embodiment is characterized by the method of connecting the windings of the brushless motor M of the first embodiment. Therefore, the part having the feature will be described in detail, and the same components will be omitted for the sake of convenience.

  As shown in FIG. 14, the brushless motor M is a delta connection switching type brushless motor, and is composed of an 8-pole 12-throttle concentrated winding brushless motor. And the teeth of 12 stators around which windings of each phase for three-phase alternating current are wound are arranged in order in the circumferential direction of four sets, with the U phase, V phase, and W phase as one set. . Accordingly, the windings of each phase are arranged at intervals of 90 degrees.

The U phase has a first U phase winding U1 and a second U phase winding U2.
A predetermined number of first U-phase windings U1 are wound around each U-phase tooth by concentrated winding. The lead start end U1a of the first U-phase winding U1 is connected to the U-phase power receiving terminal Tu via the first bus bar B1 (first power line L1) and the first and second switching elements Q1 and Q2. Yes. Further, the lead end portion U1b of the first U-phase winding U1 is connected to the V-phase power receiving terminal Tv via the third bus bar B3 (third power line L3). The first U-phase winding U1 constitutes a U-phase winding in the first system winding S1 (see FIG. 15).

  A predetermined number of second U-phase windings U2 are wound around each U-phase tooth by concentrated winding. The lead start end U2a of the second U-phase winding U2 is connected to the U-phase power receiving terminal Tu via the first bus bar B1 (first power line L1), and the fourth bus bar B4 (fourth power line L4). ) To the V-phase power receiving terminal Tv.

  In addition, the leading end portion U2b of the second U-phase winding U2 is connected to the first power line of the first U-phase winding U1 via the second bus bar B2 (second power line L2) and the third and fourth switching elements Q3 and Q4. Connected to L1.

  Accordingly, the first U-phase winding U1 and the second U-phase winding U2 are connected in series via the third and fourth switching elements Q3, Q4. The first U-phase winding U1 and the second U-phase winding U2 connected in series constitute a U-phase winding in the second system winding S2 (see FIG. 16).

  The first to fourth switching elements Q1 to Q4 are composed of N channel MOS transistors with a body diode D, and the first to fourth drive signals CT1 to CT4 are input to the gate terminals, respectively. The first to fourth switching elements Q1 to Q4 are turned on when the H-level first to fourth drive signals CT1 to CT4 are input, and the L-level first to fourth drive signals CT1 to CT4 are input. When it is done, it comes to turn off.

The V phase has a first V phase winding V1 and a second V phase winding V2.
A predetermined number of first V-phase windings V1 are wound around each V-phase tooth by concentrated winding. The lead start end V1a of the first V-phase winding V1 is connected to the V-phase power receiving terminal Tv via the fourth bus bar B4 (fourth power line L4) and the fifth and sixth switching elements Q5 and Q6. Yes. Further, the lead terminal V1b of the first V-phase winding V1 is connected to the W-phase power receiving terminal Tw via the sixth bus bar B6 (sixth power line L6). The first V-phase winding V1 constitutes a V-phase winding in the first system winding S1 (see FIG. 15).

  A predetermined number of second V-phase windings V2 are wound around each V-phase tooth by concentrated winding. The lead-out starting end V2a of the second V-phase winding V2 is connected to the V-phase power receiving terminal Tv via the fourth bus bar B4 (fourth power line L4), and the first bus bar B1 (first power line L1). ) To the U-phase power receiving terminal Tu.

  In addition, the lead terminal V2b of the second V-phase winding V2 is connected to the fourth power line of the first V-phase winding V1 via the fifth bus bar B5 (fifth power line L5) and the seventh and eighth switching elements Q7 and Q8. Connected to L4.

  Accordingly, the first V-phase winding V1 and the second V-phase winding V2 are connected in series via the seventh and eighth switching elements Q7 and Q8. The first V-phase winding V1 and the second V-phase winding V2 connected in series constitute a V-phase winding in the second system winding S2 (see FIG. 16).

  The fifth to eighth switching elements Q5 to Q8 are composed of N-channel MOS transistors with a body diode D, and the fifth to eighth drive signals CT5 to CT8 are input to the gate terminals, respectively. The fifth to eighth switching elements Q5 to Q8 are turned on when the H level fifth to eighth drive signals CT5 to CT8 are inputted, and the L level fifth to eighth drive signals CT5 to CT8 are inputted. When it is done, it comes to turn off.

The W phase has a first W phase winding W1 and a second W phase winding W2.
A predetermined number of first W-phase windings W1 are wound around each W-phase tooth by concentrated winding. The lead start end W1a of the first W-phase winding W1 is connected to the W-phase power receiving terminal Tw via the seventh bus bar B7 (seventh power line L7) and the ninth and tenth switching elements Q9 and Q10. Yes. Further, the lead end W1b of the first W-phase winding W1 is connected to the U-phase power receiving terminal Tu via the ninth bus bar B9 (the ninth power line L9). The first W-phase winding W1 constitutes a W-phase winding in the first system winding S1 (see FIG. 15).

  A predetermined number of second W-phase windings W2 are wound around each W-phase tooth by concentrated winding. The lead start end W2a of the second W-phase winding W2 is connected to the W-phase power receiving terminal Tw via the seventh bus bar B7 (seventh power line L7), and the sixth bus bar B6 (sixth power line L6). ) To the V-phase power receiving terminal Tv.

  In addition, the leading end portion W2b of the second W-phase winding W2 is connected to the seventh power line of the first W-phase winding W1 via the eighth bus bar B8 (eighth power line L8) and the eleventh and twelfth switching elements Q11 and Q12. Connected to L7.

  Accordingly, the first W-phase winding W1 and the second W-phase winding W2 are connected in series via the eleventh and twelfth switching elements Q11, Q12. The first W-phase winding W1 and the second W-phase winding W2 connected in series constitute a W-phase winding in the second system winding S2 (see FIG. 16).

  The ninth to twelfth switching elements Q9 to Q12 are composed of N-channel MOS transistors with a body diode D, and the ninth to twelfth drive signals CT9 to CT12 are input to the gate terminals, respectively. The ninth to twelfth switching elements Q9 to Q12 are turned on when the H-level ninth to twelfth drive signals CT9 to CT12 are input, and the L-level ninth to twelfth drive signals CT9 to CT12 are input. When it is done, it comes to turn off.

  Then, the third, fourth, seventh, eighth, eleventh and twelfth switching elements Q3, Q4, Q7, Q8, Q11, Q12 are held in the OFF state. Then, the first, second, fifth, sixth, ninth, and tenth switching elements Q1, Q2, Q5, Q6, Q9, and Q10 are turned on at a predetermined timing. As a result, the winding structure of the brushless motor M is a delta connection including the first U-phase winding U1 for the U phase, the first V-phase winding V1 for the V phase, and the first W-phase winding W1 for the W phase. FIG. 15 shows an equivalent circuit thereof.

Accordingly, the U-phase first U-phase winding U1 is the first system winding S1, the V-phase first V-phase winding V1 is the first system winding S1, and the W-phase first W-phase winding W1 is the first system winding S1. It becomes system winding S1.
Further, the first, second, fifth, sixth, ninth and tenth switching elements Q1, Q2, Q5, Q6, Q9, and Q10 are held in the off state. Then, the third, fourth, seventh, eighth, eleventh and twelfth switching elements Q3, Q4, Q7, Q8, Q11, and Q12 are turned on at a predetermined timing. Thus, the winding structure of the motor M is such that the U phase is a series circuit of the first and second U phase windings U1 and U2, the V phase is a series circuit of the first and second V phase windings V1 and V2, and the W phase is It becomes a delta connection consisting of a series circuit of the first and second W-phase windings W1, W2. FIG. 16 shows an equivalent circuit thereof.

  Accordingly, the series circuit of the U-phase first and second U-phase windings U1 and U2 becomes the second system winding S2, and the series circuit of the V-phase first and second V-phase windings V1 and V2 is the second system winding. Line S2, and the series circuit of the W-phase first and second W-phase windings W1 and W2 becomes the second system winding S2.

  Thus, when the brushless motor M is driven by the equivalent circuit shown in FIG. 15, the brushless motor M is driven according to its NT output characteristic of the high-speed rotation low torque output characteristic line NT1 shown in FIG. When the brushless motor M is driven by the equivalent circuit shown in FIG. 16, the brushless motor M is driven according to the NT output characteristic of the low speed rotation high torque output characteristic line NT2 shown in FIG.

  When the rotational torque of the brushless motor M (rotating shaft 3) is in the first torque region Z1, the winding structure of the brushless motor M is switched to the winding structure shown in FIG. Driving is performed using the NT output characteristic based on the output characteristic line NT1.

  Conversely, when the rotational torque of the brushless motor M (rotating shaft 3) is in the second torque region Z2, the winding structure of the brushless motor M is switched to the winding structure shown in FIG. Driving is performed using the NT output characteristic based on the torque output characteristic line NT2.

Therefore, according to the present embodiment, in addition to the above-described effects of the first embodiment, the winding structure can be applied to a brushless motor M having a delta connection, and the range of use can be expanded.
The above embodiment may be modified as follows.

  In the brushless motor M of the first and second embodiments, the number of teeth 10 is 12 and the magnetic pole of the rotor 4 is 8 poles. However, the present invention is not limited to this, and the number of teeth 10 and the rotor The number of the four magnetic poles may be changed as appropriate. Further, although the number of windings wound around the teeth 10 is two, the number of windings may be increased further.

  The bus bar device 5 according to the first and second embodiments is composed of the bearing holding member 11 and the bus bar holder 12, but the bus bar device 5 is formed by integrating the bearing holding member 11 and the holder case 12a of the bus bar holder 12. May be implemented.

  Alternatively, the outer peripheral wall 11a of the bearing holding member 11 may be omitted, and the outer peripheral surface of the rear side bottom wall 11b of the bearing holding member 11 may be press-fitted into the inner peripheral surface of the large-diameter cylindrical portion 1b. At this time, instead of the first to twelfth insertions H1 to H12 as insertion parts formed in the rear side bottom wall 11b, insertion grooves that are recessed radially inward from the outer peripheral surface of the rear side bottom wall 11b are provided. Twelve are formed corresponding to the first to twelfth insertions H1 to H12. Then, the drawing start end portions U1a, U2a,..., W1a, W2a and the drawing end portions U1b,..., V2b, W1b, WS2b of each phase may be inserted into these insertion grooves.

  -1st-9th bus-bar B1-B9 of the said 1st Embodiment curved and formed in circular arc shape by making the central axis line of the rotating shaft 3 into a concentric axis | shaft. You may implement this by making all the 1st-9th bus-bar B1-B9 cylindrical.

  In the brushless motor M of the first and second embodiments, the rotor has an IPM (Interior Permanent Magnet) structure using eight permanent magnets, but an iron pole between the four permanent magnets and the permanent magnet is used. You may apply to the rotor of the continuous type IPM structure used as the magnetic pole. Of course, you may apply to the rotor of SPM (Surface Permanent Magnet) structure.

  DESCRIPTION OF SYMBOLS 1 ... Motor case, 1a ... Case main body, 1b ... Large diameter cylindrical part, 1c ... Flange, 1d ... Front wall, 1e ... Through-hole, 2 ... Stator, 3 ... Rotating shaft, 4 ... Rotor, 5 ... Busbar apparatus, 6 7 ... Bearing, 8 ... Stator core, 9 ... Connecting part, 10 ... Teeth, 11 ... Bearing holding member, 11a ... Outer peripheral wall, 11b ... Rear side bottom wall (outer peripheral part), 11c ... Through hole, 12 ... Busbar holder, 12a ... Holder case, bottom wall 12b, 12c ... through hole, 20 ... circuit board, 21 ... rotation sensor, 30 ... rotor core, 30a ... core piece, 32 ... cover, 33 ... penetration hole, 34 ... control box, 35 ... Drive unit, 40 ... ECU (electronic control unit), 41 ... torque sensor, M ... brushless motor, C ... divided core, C1-C12 ... first to twelfth divided core, U1, U2 ... first and second U phase windings Line (switching Winding), V1, V2... First, second V-phase winding (switching phase winding), W1, W2... First, second W-phase winding (switching phase winding), U1a, U2a, V1a, V2a, W1a, W2a ... drawer start end (leader), U1b, U2b, V1b, V2b, W1b, W2b ... drawer termination (leader), B1-B9 ... first to ninth bus bars, D1-D9 ... length, T ... terminal piece (connection terminal), Ta ... engaging portion, H1-H12 ... first to twelfth through hole (penetrating portion), Ha ... signal line through hole, J ... insulating resin, L1-L9 ... First to ninth power lines, Q1 to Q12, first to twelfth switching elements (switching circuits), CNT, command signals, CT1 to CT12, first to twelfth drive signals, Tu, Tv, Tw, power receiving terminals, N ... rotational speed, Tn ... rotational torque, NT1 ... high-speed rotation low torque output characteristic line, NT2 ... low-speed rotation height Torque output characteristic line, NT3 ... load required characteristic line, NTx ... virtual output characteristic line, NTxa ... orthogonal line, Px ... switching point, S1 ... first system winding, S2 ... second system winding, Tx ... switching torque, Tmax ... maximum torque, Tmin ... minimum torque, P1 ... first point, P2 ... second point, Z1 ... first torque region, Z2 ... second torque region.

Claims (11)

A stator core;
Windings wound around the teeth of each phase of the stator core;
A stator comprising a bus bar device for energizing the windings wound around the teeth of each phase;
The bus bar device is arranged on one end side in the axial direction of the stator core, and includes a plurality of bus bars arranged in a radial direction concentrically with the central axis of the stator core, and the bus bar extends toward the anti-stator core side. With a connecting terminal protruding in the axial direction,
The lead wire of the winding wound around the teeth of each phase is drawn out in the axial direction to the bus bar device side,
The stator is characterized in that the lead wire is bent on the bus bar side in the radial direction on the side opposite to the stator core of the bus bar device, and is connected to the connection terminal of the bus bar. The stator according to claim 1,
The connection terminal has an engaging portion that engages the lead wire in the axial direction. A motor using the stator of claims 1 and 2,
One or a plurality of windings wound around the teeth of the stator core form a plurality of phase windings, and the plurality of phase windings wound around the teeth of each phase are driven. Formed from a plurality of switching phase windings having a plurality of linear rotation speed-torque output characteristics that are linear with respect to torque,
The bus bar device includes a winding switching bus bar connected to a switching circuit that switches energization between a plurality of switching phase windings, and is connected to a lead wire of the winding. The motor according to claim 3, wherein
A plurality of bus bars are provided for each phase, and the bus bar for each phase includes three power bus bars, a first winding switching bus bar, and a second winding switching bus bar. A bus bar is arranged annularly adjacent to each phase,
The plurality of switching phase windings wound around the teeth of each phase are each composed of two of a first winding and a second winding, and the first end and the end of the first winding, and the second winding. The starting end portion of the first winding is connected to the power supply bus bar, and the starting end portion of the first winding and the starting end portion of the second winding are The motor is connected to the first winding switching bus bar, and a terminal portion of the second winding is connected to the second winding switching bus bar. The motor according to claim 3 or 4,
Each of the connection terminals provided in the power feeding bus bar, the first winding switching bus bar, and the second winding switching bus bar of each phase, and the three connection terminal pairs adjacent to each other in the circumferential direction are arranged in the circumferential direction. 3 are adjacent to each other in the circumferential direction and are connected to the power feeding bus bar of the other phase, the first winding switching bus bar, and the second winding switching bus bar. A motor characterized in that the motor is formed at a position that does not intersect the connecting terminal pair in the radial direction. The motor according to claim 5, wherein
The motor is characterized in that the terminal end of the first winding and the starting end of the second winding are connected to one connection terminal. The motor according to claim 6, wherein
The motor is characterized in that the terminal end of the first winding and the start end of the second winding are connected to connection terminals on the outer side in the circumferential direction of the three connection terminal pairs. In the motor according to any one of claims 3 to 7,
The bus bar device has a bottomed cylindrical case on one axial end side of the stator core, and a plurality of annular bus bars arranged in the case are arranged at regular intervals in the radial direction, The outer peripheral portion is formed to extend outward in the radial direction, the extended outer peripheral portion, and the penetrating portions are respectively formed at positions facing the lead lines of the plurality of switching phase windings,
Each of the lead wires is inserted into the opposing insertion portions, then bent radially inward and connected to the corresponding bus bar disposed in the case. . The motor according to claim 8, wherein
The penetration portion formed in the outer peripheral portion is a penetration hole provided for each switching phase winding, and the first and second winding start and end portions serve as lead lines, A motor characterized by being inserted. The motor according to claim 8 or 9,
The plurality of bus bars arranged in the case are resin-molded with insulating resin and positioned and fixed. In the motor according to any one of claims 4 to 10,
The stator core is a three-phase, 12-slot, concentrated winding stator core, and a first winding and a second winding are wound around each tooth of the stator core. The electric power of each phase is supplied, and the first winding switching bus bar and the second winding switching bus bar of each phase are respectively connected to the star connection of either the first system winding or the second system winding. A motor comprising the switching circuit for switching.