JP2021002957A - Stator and rotary electric machine - Google Patents

Abstract

To provide a stator and a rotary electric machine that can suppress a circulating current that may be generated between coils connected in parallel in the same phase with a simple configuration.SOLUTION: First and second coils 22u1 to 22w2 that are connected in parallel in the same phase are wound in the same half-circle winding range on the counterclockwise side and the clockwise side, which are separated in the circumferential direction of a stator 11. At that time, in reciprocating folded portions 22ua to 22wb of a distributed winding which is a boundary of each winding range of the half-circle, the lead wires 22x of the first and second coils 22u1 to 22w2 are mixed while a wire other than the lead wires 22x of the corresponding coils 22u1 to 22w2 are not mixed in each winding range other than the folded portions 22ua to 22wb.SELECTED DRAWING: Figure 1

Description

The present invention relates to a stator and a rotary electric machine.

It is well known that a rotary electric machine uses a stator having a connection structure in which a plurality of coils in the same phase are connected in parallel by distributed winding (see, for example, Patent Document 1).
In a coil having such a connection structure, it is preferable that the coils connected in parallel in the same phase have the same potential when energized. The potential difference between the parallel coils causes the generation of a circulating current between the parallel coils, resulting in a loss of the rotating electric machine. Therefore, conventionally, a technique for suppressing the generation of circulating current between parallel coils has been proposed.

Japanese Unexamined Patent Publication No. 2014-96857

The potential difference between in-phase parallel coils leading to the generation of circulating current is, for example, due to the difference in the winding mode of the parallel coils, that is, the difference in the winding mode between the first coil and the second coil constituting the parallel coil. It is generated when the interlinkage magnetic flux is biased to one coil side. Therefore, when the first coil and the second coil of the parallel coil are mixed and wound in the slot between the teeth of the stator, the radial positions of the first coil and the second coil are on one side in the entire circumferential direction. If it is biased to, it will lead to the bias of the interlinkage magnetic flux. Therefore, it is necessary to replace the radial positions of the coils with each other in some places in the circumferential direction to eliminate the bias of the arrangement and to wind the coil around the stator core.

However, winding each coil while appropriately exchanging the radial positions of the first coil and the second coil of the parallel coil complicates the grade separation of the conductors extending to the next slot of the stator core. There is a concern that it will be stored. Further, this can be said not only for a two-parallel connection having a first coil and a second coil, but also for a parallel connection of four or more parallels.

The present invention has been made to solve the above problems, and an object of the present invention is to suppress a circulating current that may occur between coils connected in parallel in the same phase with a simple configuration. It is to provide electric appliances.

The stator that solves the above problems includes a three-phase coil (22) in which a lead wire (22x) is wound by distributed winding, and a plurality of coils are connected in parallel in the same phase to the three-phase coil. A stator (11, 11a) that generates a rotating magnetic field based on the supply of a three-phase drive current, and is a plurality of coils (22u1,22u2,22v1,22v2,22w1,22w2,22u3,22u4) that are connected in parallel in the same phase. ) Is the same for each coil connected in parallel, and in each winding range set separately in the circumferential direction of the stator, winding is performed by the reciprocating distribution winding with respect to the arrangement position (21c) assigned to the same phase. When the boundary portion of each winding range is set as the reciprocating folding portion (22ua, 22ub, 22va, 22vb, 22wa, 22wb, 22uc, 22ud) of the distributed winding, the folding portion of the adjacent coil The conductors are mixed, and in each winding range other than the folded portion, the conductors other than the coil conductors corresponding to each winding range are not mixed.

The rotary electric machine that solves the above problems includes a three-phase coil (22) in which a lead wire (22x) is wound by distributed winding, and a plurality of coils are connected in parallel in the same phase to the three-phase coil. A rotating electric machine (10, 11a) including a stator (11, 11a) that generates a rotating magnetic field based on the supply of a three-phase drive current and a rotor (12) that rotates based on the rotating magnetic field generated by the stator. 10a), the plurality of coils (22u1,22u2,22v1,22v2,22w1,22w2,22u3,22u4) of the same phase and parallel connection in the stator are equivalent for each coil of the parallel connection of the stator. In each winding range set separately in the circumferential direction, the winding is wound by the reciprocating distribution winding with respect to the arrangement position (21c) assigned to the same phase, and the boundary portion of each winding range is the distribution. When the reciprocating winding portion (22ua, 22ub, 22va, 22vb, 22wa, 22wb, 22uc, 22ud) is used, the conductors of adjacent coils are mixed in the folding portion, and in each winding range other than the folding portion. It is configured so that only the lead wires of the corresponding coils are mixed in each winding range.

According to the configurations of the stator and the rotary electric machine, among the three-phase coils, a plurality of coils connected in parallel in the same phase are wound in each winding range separated in the circumferential direction of the stator, which is the same for each coil connected in parallel. Be disguised. At that time, the lead wires of the adjacent coils are mixed in the reciprocating folding part of the distributed winding, which is the boundary part of each winding range, while the windings other than the winding range other than the folding part are not mixed with the wires of the corresponding coil. The dress is done. That is, a plurality of coils connected in parallel in the same phase can be arranged by packing their own conductors, and the same winding mode can be obtained without biasing the radial position to any of the coils connected in parallel. Therefore, the coils connected in parallel It is possible to suppress the deviation of the interlinkage magnetic flux to any of the above. Moreover, it can be easily realized, for example, it is not necessary to wind the coil connected in parallel while changing the radial position in some places in the circumferential direction. In addition, although there is a concern that the lead wires of adjacent coils are mixed in the reciprocating part of the distributed winding and the interlinkage magnetic flux is biased to one of the coils connected in parallel, it is a limited part only in the folded part. Therefore, it is possible to suppress the occurrence of bias in the interlinkage magnetic flux due to the influence of the folded portion. From these, it is possible to suppress the circulating current that may occur between the coils connected in parallel in the same phase with a simple configuration.

The schematic block diagram of a stator and a rotary electric machine in one Embodiment. (A) is an explanatory view of the winding mode of the stator coil, and (b) is a wiring diagram of the coil. The explanatory view of the winding mode of the U-phase coil of a stator. The explanatory view of the winding mode of the V-phase coil of a stator. It is explanatory drawing of the winding mode of the W phase coil of a stator. The explanatory view of the winding mode of the U-phase coil of the stator in the modified example. The explanatory view of the winding mode of the U-phase coil of the stator in the modified example. The explanatory view of the winding mode of the U-phase coil of the stator in the modified example.

Hereinafter, an embodiment of the stator and the rotary electric machine will be described.
As shown in FIG. 1, the rotary electric machine 10 of the present embodiment includes a brushless motor that rotationally drives based on the supply of a three-phase drive current. The rotary electric machine 10 accommodates various components including the stator 11 and the rotor 12 in an internal space of a housing (not shown). The stator 11 has an annular shape, and the rotor 12 is rotatably arranged inside the stator 11 in the radial direction. In the rotary electric machine 10 of the present embodiment, the stator 11 has 96 magnetic poles and the rotor 12 has 32 magnetic poles.

The stator 11 includes a stator core 21 made of magnetic metal and a coil 22 wound around the stator core 21. The stator core 21 has an annular portion 21a and a plurality of teeth 21b extending radially inward from the inner peripheral edge of the annular portion 21a. 96 teeth 21b are provided at equal intervals in the circumferential direction. The space between the adjacent teeth 21b functions as a slot 21c for accommodating the lead wire 22x of the coil 22 wound around the teeth 21b. Similar to the teeth 21b, 96 slots 21c are provided. The lead wire 22x of the present embodiment uses a flat wire having a rectangular cross section. The slot 21c has the width of one lead wire 22x made of a flat wire.

The coil 22 is wound so as to straddle three teeth 21b by a wave winding, which is one of the distributed windings. Further, the coil 22 is composed of U-phase, V-phase and W-phase three-phase coils corresponding to the supply of the three-phase drive current. Further, the coil 22 has two parallel connections in each of the U phase, the V phase and the W phase, and the U phase first coil 22u1, the U phase second coil 22u2, the V phase first coil 22v1 and the V phase, respectively. It includes a second coil 22v2, a W-phase first coil 22w1, and a W-phase second coil 22w2. The stator 11 of the present embodiment has a so-called 1-fold slot structure in which one phase has 32 poles and is equal to the number of magnetic poles of the rotor 12. The stator 11 having a 1x slot structure is advantageous in reducing the weight of the coil 22 portion and the like. The specific winding mode of the coil 22 of the present embodiment is as follows.

In explaining a specific winding mode of the coil 22 with reference to FIG. 2A, slot numbers “1” to “96” are assigned to the 96 slots 21c of the stator 11, and the U-phase first and the U-phase first and The winding start position of the second coil 22u1,22u2 is set to the slot number "1".

[About U-phase 1st and 2nd coils 22u1,22u2]
As shown in FIGS. 2 (a) and 3, in the U-phase first coil 22u1, "1", "4", "7" ... "49" for every three slots from the slot number "1" at the winding start position. While inserting the lead wire 22x into the slot 21c in the order of, the wave winding on the outward route side is performed, and the slot number "49" is set as the folding portion 22ua and "49" ... "7""4""1" is the same as the outward route. Wave winding on the return route is performed in the reverse order of the outward route every 3 slots. Again, as the second round trip of the wave winding, the slot number "1" is set as the folding part 22ub and the wave winding is performed as "1""4""7" ... "49" on the outward route side, and the slot number "49" is changed. As the turn-back portion 22ua, "49" ... "7""4""1" and wave winding on the return route side are performed. Further, as the third round trip of the wave winding, one round trip wave winding similar to the second round trip is performed. By performing the wave winding three times, six lead wires 22x are arranged in a row in each slot 21c in the radial direction. In the U-phase first coil 22u1, the slot number "4" is the winding end position. The lead wire 22x that has returned to the slot number “4” is led out with the slot number “4” as the winding end position without facing the slot number “1” and is connected to the neutral point member 23.

In the U-phase second coil 22u2, as described above, the winding start position of the lead wire 22x is from the slot number “1” as in the U-phase first coil 22u1. Further, when the outward path side of the wave winding of the U-phase first coil 22u1 is in the counterclockwise direction of the stator 11, the outward path side of the wave winding of the U-phase second coil 22u2 is opposite to that of the U-phase first coil 22u1. It is clockwise.

That is, in the U-phase second coil 22u2, the wave on the outward path side is inserted into the slot 21c in the order of "1", "94", "91" ... "49" for every three slots from the slot number "1". Winding is performed, and with slot number "49" as the turnaround part 22ua, "49" ... "91" "94" "1" and every three slots that are the same as the outward route, the wave winding on the return route is performed in the reverse order of the outward route. Will be done. Again, as the second round trip of the wave winding, the slot number "1" is set as the folding part 22ub and the wave winding is performed as "1" "94" "91" ... "49" on the outward route side, and the slot number "49" is changed. As the turn-back portion 22ua, "49" ... "91" "94" "1" and wave winding on the return route side are performed. Further, as the third round trip of the wave winding, one round trip wave winding similar to the second round trip is performed. In the U-phase second coil 22u2, the slot number "94" is the winding end position. The lead wire 22x that has returned to the slot number “94” is led out and connected to the neutral point member 23 with the slot number “94” as the winding end position without facing the slot number “1”.

That is, in the present embodiment, the U-phase first and second coils 22u1,22u2 that are connected in parallel in the same phase are straight lines passing through slot numbers "1" and "49" that are 180 ° opposite to each other, in this case, the stator 11. The first coil 22u1 is provided in a half-circumferential winding range on the counterclockwise direction side, and the second coil 22u2 is provided in a half-circumferential winding range on the clockwise direction side with respect to the straight line L1 passing through the center point O1 of the above. .. The U-phase first and second coils 22u1,22u2 are configured in a line-symmetric winding mode with the straight line L1 passing through the slot numbers "1" and "49" as the axis of symmetry.

Further, the slot numbers "1" and "49" located on the straight line L1 which is the axis of symmetry are the folded portions 22ub and 22ua of the wave winding of the U-phase first and second coils 22u1, 22u2, but the first and 22ua. Three lead wires 22x of the second coils 22u1 and 22u2 are mixed in the slots 21c of the slot numbers "1" and "49", respectively. The lead wires 22x in the slot 21c are lined up from the radial outer side to the inner side in the slot 21c in the winding process, but in the slot number "1", the lead wire 22x on the first coil 22u1 side is located on the outermost radial direction. Then, the lead wires 22x on the second coil 22u2 side are arranged alternately, and the lead wires 22x on the second coil 22u2 side are located on the innermost radial direction. On the other hand, in the slot number "49", the lead wires 22x on the second coil 22u2 side are located on the outermost side in the radial direction, then the lead wires 22x on the first coil 22u1 side are arranged alternately, and are arranged on the innermost side in the radial direction. The lead wire 22x on the side of the first coil 22u1 is located. For the folded portions 22ub and 22ua of the slot numbers "1" and "49", the arrangement mode of the lead wires 22x of the first and second coils 22u1,22u2 is reversed.

In the folded portions 22ub and 22ua of the slot numbers "1" and "49", the lead wires 22x of the U-phase first and second coils 22u1, 22u2 are alternately arranged one by one, and the slot numbers "1" and "49". In order to reverse the arrangement, for example, the winding of the lead wires 22x of the first and second coils 22u1,22u2 is performed as follows.

In the slot number "1", first, the lead wire 22x on the first coil 22u1 side is inserted, and the lead wire 22x on the first coil 22u1 side is arranged on the outermost radial direction in the slot 21c. Next, the first round-trip outbound winding of the wave winding on the first coil 22u1 side is performed as it is, and the winding of the first coil 22u1 is awaited immediately before the slot number "49". Next, in slot number "1", the lead wire 22x on the second coil 22u2 side is inserted, and the lead wire 22x on the second coil 22u2 side is arranged second from the radial outside in the slot 21c. Next, the first round-trip outbound winding of the wave winding on the 22u2 side of the second coil is performed as it is, and the coil is turned back at the slot number "49". At that time, in the slot number “49”, the lead wire 22x on the second coil 22u2 side is arranged in the slot 21c on the outermost radial direction. Further, the first round-trip return winding of the wave winding on the second coil 22u2 side is performed as it is, and the winding of the second coil 22u2 is waited for immediately before the slot number "1".

Next, the winding of the first coil 22u1 that has been waiting immediately before the slot number "49" is restarted, and the coil is turned back at the slot number "49". At that time, in the slot number “49”, the lead wire 22x on the first coil 22u1 side is arranged in the slot 21c second from the radial outside. Further, the first reciprocating wave winding on the 22u1 side of the first coil is performed as it is, and the return winding is performed at the slot number "1". At that time, in the slot number "1", the lead wire 22x on the first coil 22u1 side is arranged in the slot 21c at the third position from the outside in the radial direction. Further, the second round-trip outbound winding of the wave winding on the first coil 22u1 side is performed as it is, and the winding of the first coil 22u1 is waited for immediately before the slot number "49".

Next, the winding of the second coil 22u2, which has been waiting immediately before the slot number "1", is restarted and turned back at the slot number "1". At that time, in the slot number "1", the lead wire 22x on the second coil 22u2 side is arranged in the slot 21c at the fourth position from the outside in the radial direction. Further, the second round-trip outbound winding of the wave winding on the 2nd coil 22u2 side is performed as it is, and the coil is turned back at the slot number "49". At that time, in the slot number “49”, the lead wire 22x on the second coil 22u2 side is arranged in the slot 21c at the third position from the outside in the radial direction. Further, the second reciprocating wave winding on the second coil 22u2 side is performed as it is, and the winding of the second coil 22u2 is waited for immediately before the slot number "1".

Then, by repeating such winding, the lead wires 22x of the U-phase first and second coils 22u1,22u2 are alternately arranged one by one in the folded portions 22ub and 22ua of the slot numbers "1" and "49". , And the slot numbers "1" and "49" are configured to be arranged in reverse.

[About V-phase 1st and 2nd coils 22v1, 22v2]
As shown in FIGS. 2A and 4, the winding modes of the V-phase first and second coils 22v1,22v2 are the U-phase first and second coils 22u1,22u2, except that the slot numbers are different. It is the same as the winding mode. The following will be omitted as appropriate.

In the V-phase first coil 22v1, the lead wire 22x is inserted from the slot number "3" at the winding start position, and every three slots are "3", "6", "9" ... "51" in the counterclockwise direction. The wave winding on the outward route side is performed toward the direction, and the wave winding on the return route side in the reverse order of the outward route is performed with the slot number "51" as the turnaround portion 22va as "51" ... "9" "6" "3". Similarly, the wave winding of the V-phase first coil 22v1 is also performed three times back and forth between the folding section 22va on the outward path side and the folding section 22vb on the return path side, and the lead wire 22x is derived with slot number "6" as the winding end position. , Connected to the neutral point member 23.

In the V-phase second coil 22v2, the lead wire 22x is inserted from the slot number "3" in the same manner as the V-phase first coil 22v1, and V is inserted in the order of "3", "96", "93" ... "51" every three slots. Wave winding on the outward path side is performed in the clockwise direction opposite to that of the first phase coil 22v1, and the slot number "51" is set as the folding portion 22va as "51" ... "93" "96" "3". Wave winding on the return route in the reverse order of the outward route is performed. Similarly, the wave winding of the V-phase second coil 22v2 is also performed three times back and forth between the folding portion 22va on the outward path side and the folding section 22vb on the return path side, and the lead wire 22x is derived with the slot number "96" as the winding end position. , Connected to the neutral point member 23.

That is, the V-phase first and second coils 22v1,22v2 are also the first with respect to the straight line L2 that passes through the slot numbers "3" and "51" that are 180 ° opposite to each other and also passes through the center point O1 of the stator 11. The coil 22v1 is provided in a half-circumferential winding range on the counterclockwise direction side, and the second coil 22v2 is provided in a half-circumferential winding range on the clockwise direction side. The V-phase first and second coils 22v1, 22v2 are configured in a line-symmetric winding mode with the straight line L2 passing through the slot numbers "3" and "51" as the axis of symmetry.

Further, in the folded portions 22vb and 22va of the wave windings of the slot numbers "3" and "51", the lead wires 22x of the V-phase first and second coils 22v1, 22v2 are alternately arranged one by one, and the slot number "3". It is configured in the same manner as the above U phase so that the arrangement is reversed at “51”.

[About W phase 1st and 2nd coils 22w1,22w2]
As shown in FIGS. 2A and 5, the winding modes of the W phase 1st and 2nd coils 22w1,22w2 are also the U phase 1st and 2nd coils 22u1,22u2 and the V phase 1st and 2nd. It is substantially the same as the winding mode of the coils 22v1, 22v2. However, the W-phase first and second coils 22w1,22w2 have some differences other than the difference in slot numbers. The winding start positions of the U-phase first and second coils 22u1,22u2 were both slot numbers "1", and the winding start positions of the V-phase first and second coils 22v1,22v2 were both slot numbers "3". The winding start positions of the W-phase first and second coils 22w1,22w2 are different from the slot numbers "5" and "95", respectively. On the other hand, the winding end positions of the U-phase first and second coils 22u1,22u2 are slot numbers "4" and "94", respectively, and the winding end positions of the V-phase first and second coils 22v1,22v2 are slot numbers "6", respectively. Although it was different from "96", the winding end positions of the W phase 1st and 2nd coils 22w1,22w2 are both slot number "2". In addition to these, the following description will be omitted as appropriate.

In the W-phase first coil 22w1, the lead wire 22x is inserted from the slot number "5" at the winding start position, and every three slots are "5", "8", "11" ... "50" in the counterclockwise direction. Wave winding on the outward route is performed toward the direction, and the slot number "50" is set as the turning part 22wa, and "50" ... "8" "5", and further, the wave winding on the return route in the reverse order to the slot number "2". Is done. Similarly, the wave winding of the W-phase first coil 22w1 is also performed three times between the folding portion 22wa on the outward path side and the folding section 22wb on the return path side, and the lead wire 22x is derived with the slot number "2" as the winding end position. , Connected to the neutral point member 23.

In the W-phase second coil 22w2, the lead wire 22x is inserted from the slot number "95" whose winding start position is different from that of the W-phase first coil 22w1, and is "95", "92", "89" ... "50" every three slots. The wave winding on the outward path side is performed in the clockwise direction opposite to the W-phase first coil 22w1 in the order of "50" ... "92" "95" with the slot number "50" as the folding portion 22wa. Furthermore, the wave winding on the return route side in the reverse order of the outward route is performed up to the slot number "2". Similarly, the wave winding of the W-phase second coil 22w2 is also performed three times back and forth between the folding portion 22wa on the outward path side and the folding section 22wb on the return path side, and the lead wire 22x is slot number "2" like the W-phase first coil 22w1. Is derived as the winding end position and connected to the neutral point member 23.

That is, the W-phase first and second coils 22w1,22w2 are also the first with respect to the straight line L3 which passes through the slot numbers "2" and "50" which are 180 ° opposite to each other and also passes through the center point O1 of the stator 11. The coil 22w1 is provided in a half-circumferential winding range on the counterclockwise direction side, and the second coil 22w2 is provided in a half-circumferential winding range on the clockwise direction side. The W-phase first and second coils 22w1,22w2 are configured in a line-symmetric winding mode with the straight line L3 passing through the slot numbers "2" and "50" as the axis of symmetry.

Further, in the folded portions 22wb and 22wa of the wave windings of the slot numbers "2" and "50", the lead wires 22x of the W phase first and second coils 22w1, 22w2 are alternately arranged one by one, and the slot number "2". It is configured in the same manner as the above U phase and V phase so that the arrangement is reversed at "50".

In this way, the U-phase first and second coils 22u1,22u2, the V-phase first and second coils 22v1,22v2, and the W-phase first and second coils 22w1,22w2 are wound around the stator core 21. Then, the lead wires 22x at one ends of the U-phase first and second coils 22u1 and 22u2 extending together from the slot number "1" at the U-phase winding start position are connected to the U-phase power feeding terminal 24u, and the slot number at the V-phase winding start position. The lead wires 22x at one end of the V-phase first and second coils 22v1, 22v2 extending together from "3" are connected to the V-phase feeding terminal 24v. The lead wires 22x at one ends of the W-phase first and second coils 22w1,22w2 extending from the slot numbers "5" and "95" at the W-phase winding start position are both connected to the W-phase feeding terminal 24w. Further, as described above, the lead wires 22x at the other ends of the U-phase first and second coils 22u1,22u2 extending from the slot numbers "4" and "94" at the U-phase winding end positions are connected to the neutral point member 23, respectively. The lead wires 22x at the other ends of the V-phase first and second coils 22v1, 22v2 extending from the slot numbers "6" and "96" at the end of the V-phase winding are also connected to the neutral point member 23. The lead wires 22x at the other ends of the W-phase first and second coils 22w1,22w2 extending together from the slot number "2" at the end of the W-phase winding are also connected to the neutral point member 23. That is, as shown in FIG. 2B, the stator 11 of the present embodiment is configured to include a coil 22 having a three-phase Y connection forming two parallel connections in the same phase.

The operation of this embodiment will be described.
When the rotary electric machine 10 is rotationally driven, a three-phase drive current is supplied from a control circuit (not shown) to the coil 22 of the stator 11 through U-phase, V-phase and W-phase power supply terminals 24u, 24v, 24w. A rotating magnetic field is generated in the stator 11 based on the three-phase drive current supplied to the coil 22, and the rotor 12 rotates based on the rotating magnetic field generated in the stator 11.

The coil 22 of the present embodiment has a two-parallel connection structure in the same phase, and has a U-phase first and second coil 22u1,22u2, a V-phase first and second coil 22v1,22v2, and a W-phase first and The second coil 22w1,22w2 is provided. The first and second coils 22u1 to 22w2 of the U phase, the V phase, and the W phase have a structure in which substantially the entire parts other than the folded portions 22ua to 22wb are not mixed in the same slot 21c. That is, the first coil 22u1,22v1,22w1 and the second coil 22u2,22v2,22w2 can be arranged by packing their own lead wires 22x, respectively, and can have the same winding mode without biasing the radial position to one side. Therefore, the interlinkage magnetic flux is extremely small and can be suppressed to one side of the first coil 22u1,22v1,22w1 and the second coil 22u2,22v2,22w2.

For each folded portion 22ua to 22wb in which the first coil 22u1,22v1,22w1 and the second coil 22u2,22v2,22w2 are mixed in the same slot 21c, the interlinkage magnetic flux may be slightly biased to one side. Although there is concern, since the radial positions of the folded portions 22ua, 22va, 22wa on one side and the folded portions 22ub, 22vb, 22wb on the other side are reversed, the first coil 22u1,22v1,22w1 and the second coil The bias of the interlinkage magnetic flux with 22u2, 22v2, 22w2 cancels each other out. In the first place, the number of slots 21c having each folded portion 22ua to 22wb is extremely limited to two out of the 96 slots 21c in the entire circumferential direction. From these, it is possible to suppress the occurrence of bias in the interlinkage magnetic flux between the first coil 22u1,22v1,22w1 and the second coil 22u2, 22v2, 22w2 related to the folded portions 22ua to 22wb to a very small extent.

Therefore, the potential difference between the first coil 22u1,22v1,22w1 and the second coil 22u2,22v2,22w2 can be suppressed to be extremely small, the circulating current can be suppressed, and the loss of the rotary electric machine 10 can be suppressed to be sufficiently small. Moreover, it is not necessary to wind the first coil 22u1,22v1,22w1 and the second coil 22u2,22v2,22w2 around the stator core 21 while exchanging their radial positions in some places in the circumferential direction. It is feasible.

The effect of this embodiment will be described.
(1) In the stator 11 of the rotary electric machine 10 of the present embodiment, the first and second coils 22u1 to 22w2, which are in-phase and connected in parallel, are equivalent to each other separated in the circumferential direction of the stator 11 and counterclockwise. It is wound in the winding range of half a circumference on the clockwise side. At that time, in the reciprocating folding portions 22ua to 22wb of the distributed winding, which is the boundary portion of each winding range of the half circumference, the lead wires 22x of the first and second coils 22u1 to 22w2 are mixed, while each winding other than the folding portions 22ua to 22wb. In the mounting range, winding is performed so that only the lead wires 22x of the corresponding coils 22u1 to 22w2 are mixed. That is, the first and second coils 22u1 to 22w2, which are in-phase and connected in parallel, can be arranged by packing their own lead wires 22x, respectively, and the same winding mode can be obtained without biasing the radial position to one side. It is possible to prevent the interlinkage magnetic flux from being biased toward the coils 22u1 to 22w2 on the side. Moreover, it can be easily realized that the first and second coils 22u1 to 22w2 of the parallel connection do not need to be wound while the radial positions are exchanged at some places in the circumferential direction. In addition, there is a concern that the lead wires 22x of the first and second coils 22u1 to 22w2 are mixed in the reciprocating folded portions 22ua to 22wb of the distributed winding, and the interlinkage magnetic flux is slightly biased to the coils 22u1 to 22w2 on one side. However, since it is a limited portion of only the folded portions 22 ua to 22 bb, it is possible to suppress the occurrence of bias in the interlinkage magnetic flux due to the influence of the folded portions 22 ua to 22 bb. From these, it is possible to suppress the circulating current that may occur between the coils 22u1 to 22w2 connected in parallel in the same phase, and thus the loss of the rotary electric machine 10 with a simple configuration.

(2) In the folded portions 22ua to 22wb, the lead wires 22x of the first and second coils 22u1 to 22w2 are mixed and arranged in a row in the radial direction, and the lead wires 22x of the first and second coils 22u1 to 22w2 are arranged. It is arranged so as to alternate with each lead wire. As a result, the deviation of the interlinkage magnetic flux that may occur due to the influence of the folded portions 22ua to 22wb can be suppressed to be smaller. That is, it can contribute to further suppression of the circulating current that may occur between the coils 22u1 to 22w2 connected in parallel in the same phase.

(3) In the folded-back portions 22ua to 22wb, the alternating arrangement of the lead wires 22x of the first and second coils 22u1 to 22w2 is reversed at the two locations. As a result, the deviation of the interlinkage magnetic flux that may occur due to the influence of the folded portions 22ua to 22wb is canceled by the opposite arrangements, so that the deviation of the interlinkage magnetic flux can be suppressed even smaller. That is, it can contribute to further suppression of the circulating current that can be generated between the coils 22u1 to 22w2 connected in parallel in the same phase.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
-For each folded portion 22ua to 22wb, one side and the other side are further arranged so that the lead wires 22x of the first and second coils 22u1 to 22w2 of the U phase, the V phase and the W phase are alternately arranged one by one. The arrangement is reversed, but it may be changed as appropriate. For example, the alternating arrangement of the lead wires 22x on one side and the other side may not be reversed and may be the same arrangement. Further, instead of arranging the lead wires 22x alternately one by one, they may be arranged alternately every two or more wires.

Further, the lead wires 22x may be arranged alternately for each coil unit. For example, it is the embodiment shown in FIGS. 6 and 7. In addition, in order to prevent the drawings from becoming complicated, only the U phase will be described as a representative. The same applies to the V phase and the W phase.

In the embodiment shown in FIG. 6, with respect to the folded portions 22ua and 22ub of the U-phase first and second coils 22u1,22u2, in the slot number "1", the three radial outer wires 22x are the first coil 22u1 and the radial direction. The three inner wires 22x form the second coil 22u2. Further, in the slot number "49", the three radial outer wires 22x are the second coil 22u2, and the three radial inner wires 22x are the first coil 22u1, which is the opposite arrangement to the slot number "1". It is said. Even if the coils are alternately arranged in this way, the deviation of the interlinkage magnetic flux that may occur due to the influence of the folded portions 22ua and 22ub can be suppressed sufficiently small. Moreover, by arranging the slots "1" and "49" in reverse, it can be expected to suppress the bias of the interlinkage magnetic flux due to the canceling effect.

In the embodiment shown in FIG. 7, the three radial outer wires 22x of the slot number “49” are the first coil 22u1, and the three radial inner wires 22x are the second coil 22u2, as compared with the embodiment shown in FIG. As such, the arrangement is the same as the slot number "1". Even in this way, the deviation of the interlinkage magnetic flux that may occur due to the influence of the folded portions 22ua and 22ub can be suppressed sufficiently small. Further, since the three radial outer wires 22x in the slot numbers "1" and "49" are the first coil 22u1, the first coil 22u1 is wound and then the second coil 22u2 is wound. In addition, it is possible to wind them independently of each other.

-Although it was connected in two parallels in the same phase, it may be connected in four or more parallels in the same phase. For example, it is the embodiment shown in FIG. In addition, in order to prevent the drawings from becoming complicated, only the U phase will be described as a representative.

The stator 11a of the rotary electric machine 10a shown in FIG. 8 is a four-parallel connection mode in which the U-phase first, second, third, and fourth coils 22u1,22u2,22u3,22u4 are connected in parallel to each other. The first to fourth coils 22u1 to 22u4 are wound by reciprocating wave winding in each winding range of 1/4 equivalent to each other separated in the circumferential direction of the stator 11a. At the reciprocating folding portions 22ua, 22ub, 22uc, and 22ud of the distributed winding, which is the boundary portion of each winding range, three lead wires 22x of the adjacent coils 22u1 to 22u4 are mixed. In this embodiment, the conductors 22x of the folded portions 22ua, 22ub, 22uc, and 22ud are arranged in the radial direction alternately for each conductor. Further, the folded portions 22ua and 22uc which are 180 ° opposite to each other are set as the same set and have the same arrangement position, and the folded portions 22ub and 22ud are set to the same set and the same arrangement position, while the folded portions 22ua and 22uc and the folded portion are arranged. The arrangement is opposite to that of 22ub and 22ud. Even with such in-phase 4-parallel coils 22u1 to 22u4, the same effect as that of the above embodiment can be obtained. The above modification can also be applied to the arrangement of the lead wires 22x of the folded portions 22ua, 22ub, 22uc, 22ud.

The stator 11 has 96 magnetic poles and the rotor 12 has 32 magnetic poles, but the number of magnetic poles may be other than this. At that time, the lead wire 22x is wound around each of the three teeth 21b and the three slots 21c, but this may also be appropriately changed according to the number of magnetic poles.

The winding mode of the coils 22u1 to 22w2 is also an example, and may be changed as appropriate. Further, although the coils 22u1 to 22w2 are Y-connected, they may be Δ-connected.

-Although it was applied to the stators 11 and 11a including the stator core 21 having the teeth 21b, it may be applied to the stator without the teeth or the stator coreless. Other than the above, the configurations of the rotary electric machines 10 and 10a may be changed as appropriate.

The technical idea that can be grasped from the above-described embodiment and modified example will be described.
(B) A three-phase coil in which the lead wire is wound around the teeth of the stator core by distributed winding is provided, and a plurality of coils are connected in parallel in the same phase to supply a three-phase drive current to the three-phase coil. A stator that generates a rotating magnetic field based on
The plurality of coils connected in parallel in the same phase are the same for each coil connected in parallel, and in each winding range set separately in the circumferential direction of the stator, the distribution reciprocates with respect to the slots assigned to the same phase. When the winding is performed by winding and the boundary portion of each winding range is a reciprocating folded portion of the distributed winding, the conductors of adjacent coils are mixed in the folded portion, and each winding other than the folded portion In the range, the stator is configured so that only the lead wires of the corresponding coil are mixed in each winding range.

(B) Teethless or stator Coreless stator, equipped with a three-phase coil in which conductors are wound by distributed winding, and a plurality of coils connected in parallel within the same phase to the three-phase coil. A stator that generates a rotating magnetic field based on the supply of three-phase drive current.
The plurality of coils connected in parallel in the same phase are the same for each coil connected in parallel, and in each winding range set separately in the circumferential direction of the stator, the reciprocating coil with respect to the arrangement position assigned to the same phase, respectively. When the winding is performed by distributed winding and the boundary portion of each winding range is a reciprocating folded portion of the distributed winding, the conductors of adjacent coils are mixed in the folded portion, and each winding other than the folded portion In the mounting range, a stator configured in such a manner that only the lead wires of the corresponding coil are mixed in each winding range.

10,10a ... Rotating machine, 11,11a ... Steader, 12 ... Rotator, 21 ... Steader core, 21b ... Teeth, 21c ... Slot (arrangement position), 22 ... Coil (3-phase coil), 22x ... Lead wire, 22u1,22v1,22w1 ... 1st coil (coil), 22u2,22v2,22w2 ... 2nd coil (coil), 22ua, 22ub, 22va, 22vb, 22wa, 22wb ... Folded part, 22u3 ... 3rd coil (coil), 22u4 ... 4th coil (coil), 22uc, 22ud ... Folded part.

Claims (7)

A three-phase coil (22) in which a lead wire (22x) is wound by distributed winding is provided, and a plurality of coils are connected in parallel in the same phase, based on the supply of a three-phase drive current to the three-phase coil. A stator (11, 11a) that generates a rotating magnetic field.
The plurality of coils (22u1,22u2,22v1,22v2,22w1,22w2,22u3,22u4) connected in parallel in the same phase are the same for each coil connected in parallel, and each winding is set separately in the circumferential direction of the stator. In the mounting range, the winding is wound by the reciprocating distribution winding with respect to the arrangement position (21c) assigned to the same phase, and the boundary portion of each winding range is wound by the reciprocating folding portion (22ua, 22ub) of the distribution winding. , 22va, 22vb, 22wa, 22wb, 22uc, 22ud). A stator configured in a manner that does not mix. In the folded-back portion, the conductors of the adjacent coils in the winding range are mixed and arranged in a row in the radial direction, and the conductors of the adjacent coils are arranged alternately for each conductor. , The stator according to claim 1. In the folded-back portion, the conductors of the adjacent coils in the winding range are mixed and arranged in a row in the radial direction, and the conductors of the adjacent coils are arranged alternately for each coil unit. The stator according to claim 1. The fixing according to claim 2 or 3, wherein the folded-back portion is provided at an even-numbered position, and is configured by reversing the alternating arrangement mode of adjacent coils between the set on one side and the set on the other side. Child. According to claim 1, the lead wire is wound so as to straddle a plurality of teeth (21b) of the stator core (21) and is accommodated in a slot (21c) between the adjacent teeth. The stator according to any one of claims 4. The stator according to any one of claims 1 to 5, wherein the three-phase coil is composed of first and second coils that are in phase and connected in parallel. A three-phase coil (22) in which a lead wire (22x) is wound by distributed winding is provided, and a plurality of coils are connected in parallel in the same phase, based on the supply of a three-phase drive current to the three-phase coil. A stator (11, 11a) that generates a rotating magnetic field and
A rotary electric machine (10, 10a) including a rotor (12) that rotates based on a rotating magnetic field generated by the stator.
A plurality of coils (22u1,22u2,22v1,22v2,22w1,22w2,22u3,22u4) of the same phase and parallel connection in the stator are equivalent for each coil connected in parallel and separated in the circumferential direction of the stator. In each set winding range, the coil is wound with the reciprocating distribution winding with respect to the arrangement position (21c) assigned to the same phase, and the boundary portion of each winding range is the reciprocating folding portion of the distribution winding. When (22ua, 22ub, 22va, 22vb, 22wa, 22wb, 22uc, 22ud) is set, the conductors of adjacent coils are mixed in the folded portion, and each winding range other than the folded portion corresponds to each winding range. A rotary electric machine configured in such a manner that only the coil conductors are not mixed.