JP2016013053A - Armature and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature capable of suppressing the number of connection points between coils and bus bars.SOLUTION: A stator 15 includes: a stator core 21 having a plurality of teeth Ta to Ti provided at equal intervals in a circumferential direction; coils 25 wound around respective teeth Ta to Ti; and bus bars 32u,32v,32w that connect predetermined coils 25 to each other. Each coil 25 is constituted by winding a lead wire around each of the teeth Ta to Ti sequentially in a circumferential direction. Crossovers 26u,26v,26w composed of lead wires crossing over coils 25 neighboring in the circumferential direction are connected to the bus bars 32u,32v,32w so as to constitute a parallel circuit with coils 25 of a same phase.

Description

  The present invention relates to an armature and a motor including a bus bar for connecting predetermined coils to each other.

  Conventionally, as disclosed in, for example, Patent Document 1, an armature has a plurality of windings wound around teeth provided in the circumferential direction, and predetermined windings are connected to each other by a bus bar.

  For example, as shown in FIG. 5, the armature 1 is formed by winding windings around a plurality of teeth (9 pieces) provided in the circumferential direction. A U-phase winding 3u, a V-phase winding 3v, and a W-phase winding 3w are wound around the teeth 2 in order in the circumferential direction, and each of the teeth 2 includes three windings. Each winding 3u, 3v, 3w is wound independently for each tooth 2, and both end portions 3a of each winding 3u, 3v, 3w are drawn to one side in the axial direction of the armature 1. As shown in FIG. 6, both end portions 3a of the U-phase winding 3u are connected to the U-phase bus bar 4u and the V-phase bus bar 4v, respectively, and both end portions 3a of the V-phase winding 3v are connected to the V-phase bus bars 4v and W, respectively. It connects to the phase bus bar 4w, and both ends 3a of the W-phase winding 3w are connected to the W-phase bus bar 4w and the U-phase bus bar 4u, respectively. In this way, both ends 3a of the respective windings 3u, 3v, 3w are short-circuited with each other by the bus bars 4u, 4v, 4w, thereby forming a parallel circuit for each in-phase winding 3u, 3v, 3w. Delta connection is configured.

JP 2005-304278 A

  However, in the armature as described above, it is necessary to connect each of the wires (end portions 3a) drawn from the windings 3u, 3v, 3w to the bus bars 4u, 4v, 4w by welding or the like. The number of connection points is twice the number of windings (the number of teeth), which makes the connection work complicated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an armature and a motor that can suppress the number of connection points between a winding and a bus bar.

  An armature that solves the above-mentioned problem is predetermined so that a parallel circuit is configured by a stator core having a plurality of teeth provided at equal intervals in the circumferential direction, a winding wound around each of the teeth, and the windings in phase. An armature having a bus bar for connecting the windings of each other, wherein at least two windings adjacent in the circumferential direction are configured by one conductor, and are hung between the at least two windings A connecting wire composed of the passed conductive wires is connected to the bus bar.

According to this configuration, the number of connection points between the windings and the bus bar can be suppressed to less than twice the number of windings by connecting the crossover wires between the windings adjacent in the circumferential direction to the bus bar.
In the above armature, each winding is preferably configured by winding one conductive wire around each tooth in order in the circumferential direction.

According to this configuration, since the number of crossovers between the windings can be maximized, the number of connection points between the windings and the bus bar can be further suppressed.
In the above-mentioned armature, it is preferable that the crossover wires at equidistant positions in the circumferential direction are connected by the bus bar.

According to this configuration, a parallel circuit can be configured for each in-phase winding.
In the above armature, the winding is composed of a three-phase winding of a U-phase winding, a V-phase winding, and a W-phase winding that are sequentially wound around the teeth in the circumferential direction. It is preferable that the crossover is connected to the bus bar so as to form a delta connection that is a parallel circuit in each phase.

According to this structure, the delta connection made into the parallel circuit for every three-phase winding can be comprised by connecting the crossover between the windings adjacent to the circumferential direction to a bus bar.
A motor that solves the above problem is a motor that includes the armature.

  According to this configuration, the number of connection points between the winding and the bus bar can be reduced, thereby contributing to simplification of the motor manufacturing operation.

  According to the armature and the motor of the present invention, the number of connection points between the winding and the bus bar can be reduced.

It is sectional drawing of the motor of embodiment. It is a top view of the stator of the same form. It is a top view which shows each bus bar of the same form. (A) is a schematic diagram which shows the connection aspect of the coil of the same form, (b) is a circuit diagram which shows the delta connection of the coil of the same form. It is a top view of the stator of a prior art example. It is a schematic diagram which shows the connection aspect of the coil of the prior art example. It is sectional drawing of the rotor of embodiment. It is a perspective view of the bus-bar apparatus of the same form. It is a top view of the stator and bus-bar apparatus of the same form. It is sectional drawing of the bus-bar apparatus of the same form. It is a perspective view which shows the connection part in the bus bar of another example. It is a perspective view which shows the connection part in the bus bar of another example. It is a perspective view which shows the connection part in the bus bar of another example. It is sectional drawing of the rotor of another example.

Hereinafter, an embodiment of an armature and a motor will be described.
The motor of this embodiment shown in FIG. 1 is a brushless motor for an electric power steering device mounted on a vehicle.

  As shown in FIG. 1, the motor case 11 has a cylindrical cylindrical portion 12, and a first frame end 13 and a second frame end 14 that substantially close the openings at both axial ends of the cylindrical portion 12. doing. The first and second frame ends 13 and 14 are formed by pressing from a metal plate.

  The motor includes an annular stator 15 (armature) fixed to the inner peripheral surface of the cylindrical portion 12 of the case 11 and a rotor 16 disposed on the inner peripheral side of the stator 15. The rotating shaft 17 of the rotor 16 is pivotally supported by a bearing 18 held by the first frame end 13 and a bearing 19 held by the second frame end 14. The rotating shaft 17 has an end on the second frame end 14 side serving as an output end, and protrudes from the second frame end 14 to the outside of the case 11. In the present embodiment, the rotor 16 is composed of 6 poles.

  As shown in FIGS. 1 and 7, the rotor 16 includes a rotor core 16a, a magnet 16b, a cover member 16c, and an end face holder 16d. The rotor core 16a is composed of a plurality of electromagnetic steel plates (not shown) stacked in the axial direction. A rotation shaft 17 is inserted and fixed at the center of the rotor core 16a. The rotor core 16a has a substantially regular hexagonal shape as viewed from the axial direction, and magnets 16b are arranged on the planar portion of the outer peripheral surface thereof.

  A plurality of magnets 16b (six in this embodiment) are provided at equal intervals in the circumferential direction on the outer peripheral surface of the rotor core 16a. The cover member 16c has a substantially cylindrical shape that constitutes the outer shell of the rotor 16, and covers the outer periphery of each magnet 16b. Each magnet 16b is sandwiched in the radial direction by the outer peripheral surface of the rotor core 16a and the inner peripheral surface of the cover member 16c.

  The end face holder 16d has a disk shape. The end face holder 16d is formed with a press-fit convex portion 16e that protrudes toward the rotor core 16a in the axial direction, and the press-fit convex portion 16e is press-fitted into a press-fit hole 16f that is recessed in the axial end surface of the rotor core 16a. Thereby, the end face holder 16d is fixed to the rotor core 16a by this press-fitting. A plurality (six in this embodiment) of press-fitting convex portions 16e and press-fitting holes 16f are provided at equal intervals in the circumferential direction so as to correspond to the respective magnets 16b. Each magnet 16b is sandwiched in the axial direction by a pair of end surface holders 16d.

  As shown in FIG. 2, the stator core 21 constituting the stator 15 is formed by connecting end portions on the outer peripheral side of a plurality of (9 in this embodiment) divided cores 22 arranged in an annular shape by connecting members 23. Become. Each of the divided cores 22 is formed with teeth Ta to Ti extending radially inward, and each of the teeth Ta to Ti is arranged at predetermined angles (40 degrees in the present embodiment) in the circumferential direction. In FIG. 2, Ta to Ti are sequentially assigned clockwise from the teeth positioned on the upper side.

  A winding 25 is wound around each of the teeth Ta to Ti via an insulator 24 (see FIG. 1) as a resin insulating member. The nine windings 25 are classified into U-phase windings U1 to U3, V-phase windings V1 to V3, and W-phase windings W1 to W3, respectively, according to the supplied three-phase driving current. Specifically, the W-phase winding W1, the U-phase winding U1, the V-phase winding V1, the W-phase winding W2, the U-phase winding U2, and the V-phase winding V2 are sequentially clockwise with respect to the teeth Ta to Ti. W-phase winding W3, U-phase winding U3, and V-phase winding V3 are wound. Thus, the winding 25 is arranged in the order of the U phase, the V phase, and the W phase in the circumferential direction.

  Moreover, as shown in FIG.2 and FIG.4 (a), each coil | winding 25 is comprised by carrying out concentrated winding of one conducting wire (metal wire) from the teeth Ta to the teeth Ti in order. As a result, the connecting wires 26u, 26v, and 26w made of the conducting wires are spanned between adjacent windings 25 other than between the W-phase winding W1 at the start of winding and the V-phase winding V3 at the end of winding.

  In this embodiment, three connecting wires between the U-phase windings U1 to U3 and the W-phase windings W1 to W3 are referred to as a U-phase connecting wire 26u, and the V-phase windings V1 to V3 and the U-phase windings are used. Three connecting wires between U1 and U3 are V-phase connecting wires 26v, and two connecting wires between W-phase windings W2 and W3 and V-phase windings V1 and V2 are W-phase connecting wires 26w. . The U-phase crossover line 26u and the V-phase crossover line 26v are respectively arranged at equal intervals in the circumferential direction (120 degree intervals). Further, the two W-phase crossover wires 26w and both terminal portions (starting end S and terminal E) of the conducting wire are also arranged at equal intervals in the circumferential direction (120 degree intervals). The starting end S of the conducting wire is drawn from the W-phase winding W1 at the start of winding, and the terminal E of the conducting wire is drawn from the V-phase winding V3 at the end of winding.

  As shown in FIG. 1, the stator 15 includes a bus bar device 30 on the axial direction side (first frame end 13 side) of the stator core 21. The bus bar device 30 includes a holder member 31 supported by the stator core 21 and three bus bars 32u, 32v, 32w held by the holder member 31.

  As shown in FIG. 3, the bus bars 32u, 32v, 32w have the same shape. Each of the bus bars 32u, 32v, and 32w is a press-formed plate-like metal member, and includes a base portion 33 that has an arc shape centered on the axis of the rotating shaft 17, and three connection portions 34 that extend from the base portion 33. Have. In each of the bus bars 32u, 32v, 32w, the connecting portions 34 are provided at equal intervals in the circumferential direction (120 degree intervals), and are formed to extend from both circumferential end portions and the central portion in the circumferential direction of the base portion 33, respectively. Each connection portion 34 is formed in a U-shaped hook shape facing the circumferential direction.

  The bus bars 32u, 32v, and 32w are arranged such that their base portions 33 are arranged in the axial direction. And each bus-bar 32u, 32v, 32w is arrange | positioned so that a total of nine connection parts 34 of 3 each in each bus-bar 32u, 32v, 32w may be located in the circumferential direction equal space | interval (40 degree space | interval). In addition, all the connection parts 34 of each bus-bar 32u, 32v, 32w are comprised so that it may become the same position in an axial direction (refer FIG. 1).

  As shown in FIGS. 1, 8, and 10, the holder member 31 that holds the bus bars 32 u, 32 v, and 32 w has four annular plate-like holding plates (first to fourth) arranged in parallel in the axial direction. Holding plates 31a to 31d). Of the holding plates 31a to 31d, the first holding plate 31a, the second holding plate 31b, and the third holding plate 31c are sequentially arranged from the holding plate on the stator core 21 side in the axial direction (the lowermost holding plate in FIG. 8). And the fourth holding plate 31d. Each holding plate 31a to 31d has an annular shape corresponding to the base portion 33 of each bus bar 32u, 32v, 32w. The base 33 of the W-phase bus bar 32w is held between the first holding plate 31a and the second holding plate 31b, and the V-phase bus bar is held between the second holding plate 31b and the third holding plate 31c. The base portion 33 of 32v is held, and the base portion 33 of the U-phase bus bar 32u is held between the third holding plate 31c and the fourth holding plate 31d. Thus, the bus bar device 30 is configured by alternately stacking the first to fourth holding plates 31a to 31d and the bus bars 32u, 32v, and 32w.

  Of the holding plates 31a to 31d of the holder member 31, the first holding plate 31a closest to the stator core 21 is formed with three fixed leg portions 31e formed at equal intervals in the circumferential direction (120 degree intervals). . Each fixed leg 31e is for fixing the holder member 31 to the stator core 21, and has a substantially L shape that extends radially outward from the outer peripheral surface of the first holding plate 31a and bends in the axial direction. Yes. Each fixed leg 31e is formed at a position that does not overlap with each connecting portion 34 in the circumferential direction when viewed from the axial direction (see FIG. 9). An insertion convex portion 31f protruding in the axial direction is formed at the tip end portion of each fixed leg portion 31e facing the axial direction. The insertion convex part 31f is inserted in the outer peripheral recessed part 21a provided in the outer peripheral surface of the stator core 21 (each divided core 22).

  As shown in FIGS. 1, 2, and 9, the outer peripheral recess 21 a of the stator core 21 is formed on the back side (radially outer side) of each of the teeth Ta to Ti. Moreover, each outer periphery recessed part 21a is formed along the axial direction from the axial direction one end surface of the stator core 21 to an axial other end surface (refer FIG. 1). Each of the outer peripheral recesses 21a serves to guide the magnetic flux flowing in the annular portion of the teeth Ta to Ti in the stator core 21 in the circumferential direction. And the insertion convex part 31f of each fixed leg part 31e is inserted with respect to predetermined | prescribed three outer periphery recessed parts 21a among the eight outer periphery recessed parts 21a formed corresponding to each teeth Ta-Ti.

  Each insertion convex portion 31f is locked in the circumferential direction with respect to the inserted outer peripheral concave portion 21a. Thereby, the first holding plate 31 a is positioned in the circumferential direction with respect to the stator core 21. Further, each fixed leg 31e is positioned in the axial direction with respect to the stator core 21 by the stepped portion 31g (see FIG. 8) at the base of the insertion convex portion 31f being brought into contact with the axial end surface of the stator core 21.

  Next, each bus bar 32u, 32v, 32w held by the holder member 31 will be described in detail. As shown in FIGS. 3 and 8, each connecting portion 34 of each bus bar 32u, 32v, 32w includes a radially extending portion 34a extending radially outward from the base portion 33, and a distal end of the radially extending portion 34a. An axially extending portion 34b extending in the axial direction from the portion, and a hook portion 34c formed at the tip of the axially extending portion 34b and having a U-shape facing the circumferential direction. The hook portions 34c of the bus bars 32u, 32v, 32w are connected to the corresponding phase crossover wires 26u, 26v, 26w, the start end S, and the end E by welding or the like (see FIG. 9).

  Further, in each bus bar 32u, 32v, 32w, a power line connecting portion 34d for connecting a power line of each phase (not shown) to one of the three connecting portions 34 (connecting portions 34u, 34v, 34w). Are integrally formed. Each of the connection portions 34u, 34v, and 34w in which the power line connection portion 34d is formed has a radial extension portion 34a and an axial extension portion 34b that are formed wider than those of the other connection portions 34. . The power line connecting portion 34d has a configuration in which the axially extending portions 34b of the connecting portions 34u, 34v, and 34w are extended in the axial direction longer than the axially extending portions 34b of the other connecting portions 34. Yes.

  As shown in FIG. 10, the base 33 of each bus bar 32u, 32v, 32w is partially fitted in a holding groove 31h formed in the surface portion of each holding plate 31a to 31d having a disk shape. Thereby, the base part 33 of each bus-bar 32u, 32v, 32w is each hold | maintained to radial direction with respect to the holding plates 31a-31d adjacent to an axial direction, respectively. Thereby, the radial positioning of each bus bar 32u, 32v, 32w with respect to the holder member 31 is performed.

  As shown in FIGS. 1, 8, and 9, the connection portions 34 of the bus bars 32 u, 32 v, and 32 w extend outward in the radial direction of the holding plates 31 a to 31 d. The hook portion 34c is located on the outer side in the radial direction of the holding plates 31a to 31d and on the side opposite to the stator core than the fourth holding plate 31d. Moreover, the radial direction extension part 34a of each connection part 34 is latched in the circumferential direction with respect to the holding plates 31a to 31d adjacent in the axial direction. Thereby, the circumferential positioning of each bus bar 32u, 32v, 32w with respect to the holder member 31 is made. And as above-mentioned, since each fixing leg part 31e of the 1st holding plate 31a is positioned in the circumferential direction with respect to the stator core 21, the holder part 31 has each connection part 34 in the circumferential direction with respect to the stator core 21. Will be positioned. As a result, each connecting portion 34 is prevented from being displaced in the circumferential direction with respect to the winding lead portion of the stator 15.

  As shown in FIGS. 2, 4 (a), (b) and FIG. 9, these bus bars 32 u, 32 v, 32 w are configured so that the windings U <b> 1 to W <b> 3 form a delta connection that becomes a parallel circuit for each phase. It is connected to the crossover lines 26u, 26v, 26w.

  More specifically, each connecting portion 34 (hook portion 34c) of the U-phase bus bar 32u is connected to the U-phase coil U1-U3 and the W-phase windings W1-W3 along the axial direction. Each is welded to the crossover wire 26u. Similarly, each connection portion 34 (hook portion 34c) of the V-phase bus bar 32v is connected to each V-phase drawn along the axial direction between the V-phase windings V1 to V3 and the U-phase windings U1 to U3. Each of them is welded to the connecting wire 26v. Two of the connection portions 34 (hook portions 34c) of the W-phase bus bar 32w are provided between the W-phase winding W2 and the V-phase winding V1, and between the W-phase winding W3 and the V-phase winding V2. Are welded to the respective W-phase crossover wires 26w drawn along the axial direction. The remaining one connection portion 34 (hook portion 34c) of the W-phase bus bar 32w is connected to the leading end S and the terminating end of the conducting wire drawn substantially along the axial direction from the W-phase winding W1 and the V-phase winding V3, respectively. E is welded.

  In addition, each connection part 34 and each connection line 26u, 26v, and 26w are connected to each other by welding by hooking the connection lines 26u, 26v, and 26w to the hook part 34c of the connection part 34 and temporarily holding them. The Further, the starting end S and the end E of the conducting wire are welded together in a state of being disposed inside the hook of the connecting portion 34 of the W-phase bus bar 32w.

  By connecting in this way, as shown in FIG.4 (b), the delta connection by which the coil | winding U1-W3 was made into the parallel circuit in each phase is comprised. And each bus-bar 32u, 32v, 32w is electrically connected with the said power line of U phase, V phase, and W phase for electric power supply in those power line connection parts 34d.

Next, the operation of this embodiment will be described.
In the motor described above, the three-phase drive current having a phase difference of 120 degrees from a drive circuit (not shown) is applied to the corresponding phase windings U1 to U1 through the bus bars 32u, 32v, and 32w from the respective power lines. W3 is supplied. Then, the windings U1 to W3 are respectively excited to generate a rotating magnetic field in the stator 15, and the rotor 16 rotates based on the rotating magnetic field.

Next, a method for manufacturing the stator 15 configured as described above will be described.
First, the divided cores 22 are arranged in a straight line so that the teeth Ta to Ti are parallel to each other, and the stator core 21 is in a developed state. In this unfolded state, each split core 22 is connected by a connecting member 23 so that the outer peripheral end portion is rotatable. In this unfolded state, the one conductor is concentratedly wound in order from the teeth Ta to the teeth Ti. Thereby, each winding U1-W3 and each crossover 26u, 26v, 26w are formed.

  Next, an annularization process is performed in which the stator 15 in the expanded state is rounded so that the tips of the teeth Ta to Ti face inward in the radial direction. Through this process, the stator 15 is in an annular state as shown in FIG.

  Next, the connection process with respect to each bus-bar 32u, 32v, 32w arrange | positioned at the axial direction edge part of the stator 15 is performed. In this step, the connecting wires 26u, 26v, 26w and the leading ends S and the terminating ends E of the conductive wires are welded in the above-described manner to the connecting portions 34 of the bus bars 32u, 32v, 32w of the corresponding phases. A delta connection is formed in which W3 is a parallel circuit in each phase. At this time, there are 8 welding locations of the connecting wires 26u, 26v, 26w and the connecting portion 34, and there is one location where the starting end S and the terminating end E of the conducting wire are welded together. In addition, the operation | work which welds the start end S and the termination | terminus E of conducting wire to the one connection part 34 arrange | positions two lines of the start end S and the termination | terminus E inside the hook of the connection part 34, and welds to the two lines Is done together. For this reason, compared with the welding operation of the starting end S and the terminal end E, the operation of welding one connecting wire 26u, 26v, 26w to the connecting portion 34 is easier.

Next, characteristic effects of the present embodiment will be described.
(1) By connecting the connecting wires 26u, 26v, and 26w spanned between the windings 25 adjacent in the circumferential direction to the corresponding bus bars 32u, 32v, and 32w, a parallel circuit is formed by the windings 25 of the same phase. Is configured. Here, as a conventional example, considering that the winding 25 is independent for each of the teeth Ta to Ti, it is necessary to connect each of the two wires drawn from each winding 25 to the bus bar. Is twice the number of windings 25 (that is, 18 locations). On the other hand, in the present embodiment, the number of connection points is suppressed to less than twice the number of the windings 25 (less than 18 locations) by connecting the crossover wires 26u, 26v, and 26w to the bus bars 32u, 32v, and 32w. Can do.

  (2) Each winding 25 is configured by winding one conductive wire around each of the teeth Ta to Ti in order in the circumferential direction. According to this configuration, the number of crossovers 26u, 26v, 26w between the windings 25 can be maximized (the number obtained by subtracting 1 from the number of windings 25, which is 8 in this embodiment). 25 and the number of connection points between the bus bars 32u, 32v, and 32w can be further suppressed.

  (3) Since the connecting wires 26u, 26v, and 26w at equal circumferential positions are connected by the bus bars 32u, 32v, and 32w, a parallel circuit can be configured for each winding 25 in the same phase.

  (4) The windings 25 are U-phase windings U1 to U3, V-phase windings V1 to V3, and W wound around the teeth Ta to Ti in the circumferential direction in the order of U phase, V phase, and W phase. It consists of three-phase windings of phase windings W1 to W3. Then, by connecting the crossover wires 26u, 26v, and 26w to the bus bars 32u, 32v, and 32w, it is possible to configure a delta connection in which the windings U1 to W3 are parallel circuits in each phase.

  (5) The connection part 34 of the bus bars 32u, 32v, 32w is configured to overlap with the lead-out part (base end part) of the crossover lines 26u, 26v, 26w when viewed from the axial direction. As a result, since the connecting wires 26u, 26v, 26w can be routed to the connecting portion 34 by pulling out the connecting wires 26u, 26v, 26w along the axial direction, the pulling length of the connecting wires 26u, 26v, 26w can be shortened. As a result, handling of the crossover lines 26u, 26v, and 26w becomes easy.

  (6) The stator core 21 is formed with an outer peripheral recess 21a for flux rectification. And the insertion convex part 31f formed in the fixed leg part 31e of the 1st holding plate 31a (holder member 31) is inserted in the outer peripheral recessed part 21a of the stator core 21, and is latched in the circumferential direction. As a result, the holder member 31 and the bus bars 32u, 32v, 32w held by the holder member 31 can be positioned in the circumferential direction with respect to the stator core 21.

In addition, you may change the said embodiment as follows.
In the above embodiment, the rotor 16 is an inner rotor type motor arranged on the inner side of the stator 15. However, on the contrary, an outer rotor type motor in which the stator is arranged on the inner side of the rotor may be used. In this case, the teeth Ta to Ti of the stator are formed in a shape extending radially outward, and the windings U1 to W3 can be easily wound around the teeth Ta to Ti without the stator core 21 being divided. is there.

  In the above embodiment, the number of windings 25 (the number of teeth Ta to Ti) is nine, but is not particularly limited thereto. For example, when the winding 25 is constituted by three phases, the number of the windings 25 is preferably 3n (where n is an integer of 2 or more). Further, it is preferable that the ratio between the number of poles of the rotor 16 and the number of windings 25 is 2: 3.

  In the above embodiment, the connecting wires 26u, 26v, 26w and the leading end S and the terminating end E of the conducting wires are drawn substantially along the axial direction and connected to the connecting portions 34 of the corresponding bus bars 32u, 32v, 32w. Yes. That is, the connection part 34 of the bus bars 32u, 32v, 32w is configured to overlap with the lead-out part (base end part) of the crossover lines 26u, 26v, 26w when viewed from the axial direction. However, the present invention is not limited to this, and the interval in the circumferential direction of each connecting portion 34 of each bus bar 32u, 32v, 32w is narrowed so that the crossovers 26u, 26v, 26w are routed in the axial direction and circumferential direction to the corresponding connecting portion 34. May be. According to this configuration, since the circumferential interval between the connection portions 34 can be reduced, the bus bars 32u, 32v, 32w can be reduced in circumferential width.

  In the above embodiment, all the nine windings 25 are configured by a single conductive wire, but may be configured by a plurality of conductive wires, and at least two windings 25 are configured by a single conductive wire. It only has to be done. For example, the W-phase winding W1, the U-phase winding U1, and the V-phase winding V1 are configured by the first conductor, and the W-phase winding W2, the U-phase winding U2, and the V-phase winding V2 are the second conductors. You may comprise by conducting wire, and you may comprise W phase winding W3, U phase winding U3, and V phase winding V3 by 3rd conducting wire. In this case, two connecting wires are formed on the first to third conducting wires, respectively, and a total of six connecting wires are formed. And each crossover and each terminal line of the 1st-3rd conducting wire are connected to the bus bar of a corresponding phase. At this time, there are six welding locations between each crossover and the bus bar, and there are three locations where the starting end of the conducting wire and the end of another conducting wire are welded together. Even with such a configuration, the number of connection points can be suppressed to less than twice the number of windings 25 (less than 18 locations).

-In the said embodiment, although applied to the motor used for the electric power steering device for vehicles, you may apply to the brushless motor of other uses.
In the above embodiment, the number of the fixed leg portions 31e provided on the first holding plate 31a is three. However, the number is not limited to this, and may be two, for example, four or more. Moreover, in the said embodiment, although the fixed leg part 31e was formed in the 1st holding plate 31a, you may form not only in this but in any of the 2nd-4th holding plates 31b-31d.

  In the above embodiment, the insertion protrusion 31f of each fixed leg 31e is inserted into the outer peripheral recess 21a for magnetic flux rectification formed in the stator core 21, but a different recess from the outer peripheral recess 21a for magnetic flux rectification. It is good also as a structure which is formed in the stator core 21 and the insertion convex part 31f is inserted in the recessed part.

  In the above embodiment, the hook portion 34c formed in each connection portion 34 of each bus bar 32u, 32v, 32w is U-shaped in the circumferential direction when viewed in the axial direction, but is not particularly limited to this. It is not a thing. For example, as shown in FIG. 11, the hook portion 34c may be formed in a U shape that faces the radial direction when viewed in the axial direction. Further, for example, as shown in FIG. 12, the hook portion 34c may be formed in a U-shape that faces the radial direction when viewed in the circumferential direction. Further, for example, as shown in FIG. 13, the hook portion 34 c may be formed in a U shape that faces the axial direction when viewed in the circumferential direction.

  -You may change the rotor 16 of the said embodiment to the rotor 40 of a multistage structure as shown, for example in FIG. In the example shown in the figure, the rotor 40 has a configuration in which three rotor portions (a first rotor portion 41, a second rotor portion 42, and a third rotor portion 43) are stacked in the axial direction, and each rotor portion 41 is configured. ˜43 are magnetically skewed in the circumferential direction.

  Each rotor part 41-43 has mutually the same structure (shape), and is comprised integrally from the rotor core 51, the magnet 52, the cover member 53, and the end surface holder 54, respectively. The rotor core 51 of each rotor part 41-43 consists of several electromagnetic steel plates (not shown) laminated | stacked on the axial direction, and the rotating shaft 17 is inserted and fixed to the center part of each rotor core 51. As shown in FIG. Similarly to the rotor core 16a of the above embodiment, each rotor core 51 has a substantially regular hexagonal shape when viewed from the axial direction, and magnets 52 are arranged on the planar portion of the outer peripheral surface thereof.

  Each cover member 53 has a substantially cylindrical shape constituting the outer shell of each rotor portion 41 to 43, and covers the outer periphery of each magnet 52 in each rotor portion 41 to 43. In each rotor part 41-43, each magnet 52 is sandwiched in the radial direction by the outer peripheral surface of the rotor core 51 and the inner peripheral surface of the cover member 53.

  The end surface holder 54 has a disk shape and is provided on one end side in the axial direction of each of the rotor portions 41 to 43 (the right end side in FIG. 14). A plurality of first convex portions 54 a and a plurality of second convex portions 54 b are formed on the end surface holders 54 of the rotor portions 41 to 43 so as to protrude from the front surface and the back surface of the end surface holder 54, respectively. The first protrusions 54a of the end face holders 54 are press-fitted and fixed in press-fitting holes 51a formed through the corresponding rotor cores 51 (the rotor core 51 on the left side of the end face holders 54 in FIG. 14). Thereby, in each rotor part 41-43, the end surface holder 54 is being integrally fixed to the axial direction one end surface (The right end surface of the rotor core 51 in FIG. 14) of the rotor core 51. As shown in FIG.

  The second convex portion 54 b of the end face holder 54 of the first rotor portion 41 is press-fitted and fixed in a press-fit hole 51 a formed through the rotor core 51 of the second rotor portion 42. Similarly, the second convex portion 54 b of the end surface holder 54 of the second rotor portion 42 is press-fitted and fixed in a press-fit hole 51 a formed through the rotor core 51 of the third rotor portion 43. Thereby, each rotor part 41-43 is mutually fixed by what is adjacent in an axial direction.

  In addition, although the example of the rotor 40 of the three-stage structure which consists of the three rotor parts 41-43 was given in FIG. 14, it is not specifically limited to this, The multistage which consists of two or four or more rotor parts It is good also as a rotor of composition.

  DESCRIPTION OF SYMBOLS 15 ... Stator (armature), 16 ... Rotor, 21 ... Stator core, 22 ... Split core, 25 ... Winding, 26u, 26v, 26w ... Crossover, 32u, 32v, 32w ... Busbar, Ta-Ti ... Teeth, U1 ˜U3... U phase winding, V1 to V3... V phase winding, W1 to W3.

Claims (5)

A stator core having a plurality of teeth provided at equal intervals in the circumferential direction;
A winding wound around each of the teeth;
An armature including a bus bar that connects the predetermined windings so as to form a parallel circuit with the windings of the same phase,
The at least two windings adjacent to each other in the circumferential direction are configured by a single conducting wire, and a connecting wire composed of the conducting wire spanned between the at least two windings is connected to the bus bar. Armature. The armature according to claim 1,
Each said coil | winding is comprised by winding one conducting wire around the said teeth in order in the circumferential direction, The armature characterized by the above-mentioned. The armature according to claim 2, wherein
The armature, wherein the crossover wires at equal circumferential positions are connected by the bus bar. The armature according to any one of claims 1 to 3,
The winding is composed of a three-phase winding of a U-phase winding, a V-phase winding, and a W-phase winding that are sequentially wound around the teeth in the circumferential direction.
The armature is characterized in that the crossover is connected to the bus bar so that the winding forms a delta connection in which each phase is a parallel circuit.   A motor comprising the armature according to claim 1.