WO2017149934A1

WO2017149934A1 - Winding structure for rotary electric machine stator

Info

Publication number: WO2017149934A1
Application number: PCT/JP2017/000492
Authority: WO
Inventors: 敦誉小柴; 貞一郎千葉
Original assignee: 株式会社小松製作所
Priority date: 2016-02-29
Filing date: 2017-01-10
Publication date: 2017-09-08
Also published as: JP2017158255A; JP6649803B2; DE112017000116T5

Abstract

In order to provide a winding structure that is for a rotary electric machine stator and that can limit the height of coil ends, the present invention is configured such that: first two-loop continuous coils CA1-CA4 and first two-loop continuous coils CB1-CB4 are staggered at six slot pitches with respect to the rotational direction; output points a7, a5, a3 and input points a6, a4, a2 are respectively and sequentially connected; output points b8, b6, b4 and input points b5, b3, b1 are respectively and sequentially connected; an innermost output point a1 is a neutral point N1; an innermost input point b2 is a neutral point N2; an outermost input point a8 is a current input point U1in for a one-phase coil that is connected in parallel; and an outermost output point b7 is a current input point U2in for a one-phase coil. Neutral point N1 and neutral point N2, which are for respective phases, are each connected to a segment conductor that has a slot insertion part and are staggered by one layer in the radial direction.

Description

Winding structure of rotating electric machine stator

The present invention relates to a winding structure of a rotating electric machine stator that can suppress the height of a coil end.

In recent years, wave winding has been adopted in the automobile industry as a main winding method for square wires. A wave winding using a square wire is formed by connecting a plurality of pine needle-shaped segment conductors. A wave shape is formed by joining the tip ends of the segment conductors that are installed adjacent to each other in the circumferential direction. As the number of windings increases, the magnetomotive force can be increased and the current can be reduced within the voltage saturation range.

In Patent Document 1, the coils of each phase have two constituent coils connected in parallel, and the neutral ends, which are the ends on the neutral point side of the two constituent coils, are arranged side by side in the core radial direction. In each phase, two neutral ends arranged side by side in the core radial direction are respectively connected in a state in which the connection conductor is sandwiched from both sides in the core radial direction.

JP 2011-45165 A

However, as the number of turns of the wave winding increases, the number of connection points (welding points) increases, and the crossover increases in proportion to the increase in the number of turns. Originally, there is an aim to reduce the height of the coil end by using a square wire, but the increase in the connecting wire increases the coil end height. Furthermore, although the feeding point of each phase can be connected from the outer peripheral side of the stator, the neutral point needs to be extended and connected from the inner peripheral side of the stator to the outer peripheral side, resulting in a high coil end. Or if it connects so that a connection conductor may be pinched | interposed in each neutral point as described in patent document 1, a coil end will become high.

The present invention has been made in view of the above, and an object of the present invention is to provide a winding structure of a rotating electrical machine stator capable of suppressing the height of a coil end.

In order to solve the above-described problems and achieve the object, a winding structure of a rotating electrical machine stator according to the present invention has a predetermined slot in a stator core in which a plurality of teeth and a plurality of slots are alternately formed in the circumferential direction. A winding structure of a rotating electrical machine stator in which coils are wound at a pitch, and an input point and an output point are formed on the lead side, and two rows of coils are wound in a circumferential direction at a predetermined slot pitch in two rows The first two-continuous continuous coil and the first two-continuous continuous coil have the same structure and are arranged with a predetermined slot pitch shifted with respect to the circumferential direction with respect to the first two-continuous continuous coil. A plurality of two-layer wave winding coils composed of two two-round continuous coils are arranged in the radial direction, and the input points and the output points of the first two-round continuous coils are arranged in the same radial direction, and The input point and the output point of the second two-round continuous coil are arranged in the same radial direction, and the output point and the inner peripheral side of the first two-round continuous coil on the outer peripheral side adjacent in the radial direction are arranged. The input point of the first two-round continuous coil is sequentially connected to the input point of the second two-round continuous coil on the outer peripheral side adjacent in the radial direction and the second two-round continuous coil on the inner peripheral side. The output point is sequentially connected, and the output point of the first two-round continuous coil on the innermost circumference and the input point of the second two-round continuous coil located on the second outermost layer from the innermost circumference The first neutral point and the second neutral point of the double star connection, and the second outer point located on the innermost second layer from the outermost outermost input point and the outermost outermost continuous coil. The output point of the two-round continuous coil is the first current of two one-phase coils that are double-star connected. As a force point and a second current input point, at least the first neutral point of each phase and the second neutral point of each phase are connected to segment conductors each having a slot insertion portion, and one layer in the radial direction. It is characterized by being arranged at positions shifted by minutes.

Further, the winding structure of the rotating electrical machine stator according to the present invention is a rotating electrical machine stator in which a coil is wound in a predetermined slot pitch on a stator core in which a plurality of teeth and a plurality of slots are alternately formed in the circumferential direction. A first two-turn continuous coil having a winding structure, in which an input point and an output point are formed on the lead portion side, and two rows of coils are wound in a circumferential direction at a predetermined slot pitch, and the first A two-layer wave having the same structure as the two-turn continuous coil of FIG. 5 and comprising a second two-turn continuous coil arranged with the predetermined slot pitch shifted with respect to the circumferential direction with respect to the first two-turn continuous coil. A plurality of wound coils are arranged in the radial direction, the input points and the output points of the first two-round continuous coil are arranged in the same radial direction, and the input of the second two-round continuous coil point And the output points are arranged in the same radial direction, and the output point of the first two-round continuous coil on the outer peripheral side adjacent in the radial direction and the input point of the first two-round continuous coil on the inner peripheral side, Are sequentially connected, and the input point of the second continuous coil on the outer peripheral side adjacent to the radial direction and the output point of the second continuous coil on the inner peripheral side are sequentially connected, and the innermost peripheral The output point of the first two-round continuous coil and the input point of the second two-round continuous coil located in the second outermost layer from the innermost circumference of the two one-phase coils that are double-star connected The first current input point and the second current input point, and the second two-round continuation located in the second inner circumferential side layer from the input point and the outermost outermost circumference of the first two-round continuous coil The coil output points are the first neutral point and the second neutral point of the double star connection. In both cases, the first neutral point of each phase and the second neutral point of each phase are connected to segment conductors having slot insertion portions, and are arranged at positions shifted by one layer in the radial direction. It is characterized by.

Further, the winding structure of the rotating electrical machine stator according to the present invention is the above invention, wherein the first two-round continuous coil and the second two-round continuous coil are pine needle-shaped segments from the lead portion side to the slot. The conductor is inserted, the end of the segment conductor is welded on the side opposite to the lead portion, the output point of the first two-turn continuous coil on the outer peripheral side adjacent in the radial direction, and the first two turns on the inner peripheral side The connection with the input point of the continuous coil and the connection between the input point of the second two-round continuous coil on the outer peripheral side adjacent in the radial direction and the output point of the second two-round continuous coil on the inner peripheral side And connected by a pine needle-shaped segment conductor having a slot insertion portion.

Further, the winding structure of the rotating electrical machine stator according to the present invention is the above-described invention, wherein m is an integer of 1 or more, and the number of turns N in the radial direction is N = 2m + 2. Between the output point at the position of the number of turns (N− (2m−1)) and the input point at the position of the number of turns (N−2m), a pine needle-shaped segment conductor having a slot insertion portion is connected. In addition, between the plurality of the second two-round continuous coils, between the input point at the position of the number of turns (N−2 (m−1)) and the output point at the position of the number of turns (N− (2m + 1)), It is connected by a pine needle-shaped segment conductor having a slot insertion portion.

In the winding structure of the rotating electrical machine stator according to the present invention, in the above invention, the first two-round continuous coil and the second two-round continuous coil intersect each other at a predetermined slot pitch in the radial direction. It is characterized by being wound.

In the winding structure of the rotating electrical machine stator according to the present invention, the predetermined slot pitch is a value obtained by dividing the number of slots by the number of poles of the rotor.

Further, the winding structure of the rotating electrical machine stator according to the present invention is characterized in that, in the above invention, the slot has a semi-closed slot shape.

According to the present invention, the output point of the outer peripheral first continuous coil adjacent to the radial direction and the input point of the first peripheral continuous coil on the inner peripheral side are sequentially connected to be adjacent in the radial direction. The input point of the second continuous coil on the outer peripheral side and the output point of the second continuous coil on the inner peripheral side are sequentially connected to output the first continuous coil on the innermost side. The first neutral point and the second neutral point of the double star connection or the double star connection are made to the point and the input point of the second continuous coil located on the second outer peripheral side from the innermost periphery. The first input point and the second input point of the two one-phase coils, and the second input point of the first two-round continuous coil on the outermost circumference and the second inner circumference side from the outermost circumference. The output points of the two continuous coils of two are connected to the first input points of two one-phase coils that are double-star connected, and 2 input points, or the first neutral point and the second neutral point of a double star connection, and at least the first neutral point of each phase and the second neutral point of each phase are respectively inserted into slots. Segment conductors having a portion are connected and arranged at a position shifted by one layer in the radial direction. Thereby, the two conductors that connect the neutral points of the two one-phase coils in parallel can be arranged adjacent to each other in the radial direction and do not overlap. For this reason, even in the case of double star connection, the height of the coil end on the lead portion side can be suppressed.

FIG. 1 is a diagram illustrating a state in which wave windings are wound around a stator core when a rotating electrical machine stator used in a rotating electrical machine such as a permanent magnet type rotating electrical machine is configured. FIG. 2 is a perspective view showing a winding state of the first two-round continuous coil. FIG. 3 is a view of the first two-round continuous coil developed linearly as seen from the lead portion side. FIG. 4 is a perspective view showing a winding state when the first two-round continuous coil is arranged in the outer circumferential direction. FIG. 5 shows a linear development of a two-layer wave winding coil in which a second two-turn continuous coil having the same configuration as that of the first two-turn continuous coil is shifted in the rotational direction by 6 slot pitches. It is the figure seen from the lead part side. FIG. 6 is a perspective view showing a winding state of a two-layer wave winding coil in which a second two-turn continuous coil having the same configuration as that of the first two-turn continuous coil is shifted by six slot pitches in the rotational direction side. It is. FIG. 7 is a cross-sectional view showing a winding state of the wave winding coil for one phase. FIG. 8 is a diagram showing the connection between the first two continuous coils and between the second two continuous coils. FIG. 9 is a diagram showing a winding state when the connection shown in FIG. 8 and the connection at the neutral point are pine needle shaped segment conductors. 10 is a perspective view of the rotating electrical machine stator in the connected state shown in FIG. 9 as viewed from the lead portion side. FIG. 11 is a perspective view of another connection configuration of the rotating electric machine stator in the coupled state shown in FIG. 9 as seen from the lead portion side. FIG. 12 is a perspective view of the rotating electrical machine stator as viewed from the side opposite the lead portion. FIG. 13 is an explanatory diagram for explaining a connected state in the case of an eight-turn configuration using four two-layer wave winding coils. FIG. 14 is an explanatory diagram for explaining a connected state in the case of a four-turn configuration using two two-layer wave winding coils. FIG. 15 is an explanatory diagram for explaining a connected state in the case of a six-turn configuration using three two-layer wave winding coils. FIG. 16 is an explanatory diagram for explaining a connection state in a 10-turn configuration using five two-layer wave winding coils. FIG. 17 is an explanatory diagram for explaining a connection state in a 12-turn configuration using six two-layer wave winding coils. FIG. 18 is an explanatory diagram for explaining a connected state in a 14-turn configuration using seven two-layer wave winding coils. FIG. 19 is a generalized view of the connection relationship of the pine needle-shaped segment conductors for connecting the respective two-round continuous coils in the first two-round continuous coil and the second two-round continuous coil. FIG. 20 is a generalized view of another connection relationship of the pine needle-shaped segment conductors for connecting the respective two-round continuous coils in the first two-round continuous coil and the second two-round continuous coil. FIG. 21 is a cross-sectional view of the stator core in the case where the slot has a semi-closed slot shape.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing a state in which a wave winding is wound around a stator core when a rotating electrical machine stator used in a rotating electrical machine such as a permanent magnet type rotating electrical machine is configured. As shown in FIG. 1, the stator core 1 has a plurality of teeth 2 and a plurality of slots 3 in the circumferential direction RT, which are regularly formed in an annular shape on the inner peripheral side, which is the region E side where the rotor is inserted. Yes. In FIG. 1, 48 slots 3 are formed. Note that the number of poles of the rotor (not shown) is eight. The rotating electric machine has a function of an electric motor and / or a generator. The stator core 1 is configured by laminating a plurality of annular electromagnetic steel plates.

In the present embodiment, the winding wound around the stator core 1 is formed into a wave shape using a plurality of segment conductors 10. Both end portions of the pine needle-shaped segment conductor 10 are inserted into the slots 3 at a predetermined slot pitch in the direction of the central axis AX from the lead portion side (feeding portion side) 1a. The portion of the inserted segment conductor 10 that protrudes from the opposite lead side 1b, that is, the portion that protrudes from the slot insertion portion, is bent so as to spread in the circumferential direction RT, and the tip 10a of the segment conductor 10 is adjacent to another adjacent segment conductor. 10 is welded to the tip 10a. By this welding, a first two-turn continuous coil CA1 which is a wave winding composed of a plurality of segment conductors 10 is formed. In addition, in order to suppress the height of a coil end, it is preferable that a coil | winding is a square wire, especially a flat wire.

FIG. 2 is a perspective view showing a winding state of the first two-round continuous coil. FIG. 3A is a view of the first two-round continuous coil CA1 developed linearly as viewed from the lead portion side 1a. In the first two-turn continuous coil CA1, the tip ends 10a of the segment conductors 21 to 28 are connected in series by welding on the non-lead portion side 1b. Both end portions of the segment conductors 22 to 24 and 26 to 28 are inserted into the slot 3 at a pitch of 6 slots. The

segment conductors

22, 26, 23, 27, 24, and 28 are inserted with a shift of one slot pitch. The segment conductors 22 to 24 are arranged with a 6-slot pitch therebetween. Similarly, the segment conductors 26 to 28 are arranged at a 6-slot pitch from each other. The segment conductor 21 is arranged in the connection area EA, and the one inserted into the slot 3 at a 7-slot pitch is separated at the lead portion side 1a, and the segment conductor 21a having the input point a2 which is the separated end, It consists of the segment conductor 21b which has the output point a1 which is an edge part. The segment conductor 25 in the connection area EA has a role of connecting the first coil to the second coil, and both ends thereof are inserted into the slots 3 at a pitch of 5 slots. The segment conductors 25 disposed between the

segment conductors

24 and 26 are disposed at a 6-slot pitch with respect to each of the

segment conductors

24 and 26.

The welded portions T21 to T28 connect the tip ends of adjacent segment conductors on the side opposite to the lead portion 1b by welding. The weld T21 connects the

segment conductors

21a and 22 with each other. The weld T22 connects the

segment conductors

22 and 23. The welded portion T23 connects the

segment conductors

23 and 24 together. The weld T24 connects the

segment conductors

24 and 25. The welded portion T25 connects the

segment conductors

25 and 26. The weld T26 connects the

segment conductors

26 and 27. The weld T27 connects the

segment conductors

27 and 28. The weld T28 connects the

segment conductors

28 and 21b.

The current input from the input point a2 is sequentially, in the clockwise direction CW, segment conductor 21a, weld T21, segment conductor 22, weld T22, segment conductor 23, weld T23, segment conductor 24, weld T24, segment The conductor 25 flows through the first round, and the segment conductor 25, the welded portion T25, the segment conductor 26, the welded portion T26, the segment conductor 27, the welded portion T27, the segment conductor 28, the welded portion T28, It flows through the segment conductor 21b and the second round of wave winding ends and reaches the output point a1. As shown in FIG. 3A, the conductors arranged in the adjacent slots have the same current direction, for example, the conductors arranged at the slot position 6 and the slot position 7.

Here, the first two-turn continuous coil CA1 is wound in a zigzag manner in the slot 3 every six slot pitches, and is adjacent to the radially adjacent layer L1 on the inner peripheral side and the layer L2 on the outer peripheral side. It is wound alternately. The layer represents the winding position in the slot 3 and is shown as layers L1, L2,..., L8 sequentially from the inner periphery side to the outer periphery side. Further, since each segment conductor is arranged in an arc shape along the circumferential direction in the stator core 1, the first winding and the second winding intersect at the lead portion side 1a and the non-lead portion side 1b. To do.

For example, the segment conductor 27 extending from the layer L1 to the lead portion side 1a extends in the circumferential direction, shifts to the position of the layer L2 at a pinna shaped apex portion 27t (see FIG. 2), and further extends in the circumferential direction. Enter layer L2 of the eye slot. Similarly, the segment conductors 23 arranged with a one-slot pitch deviation extend from the layer L1 to the lead portion side 1a and extend in the circumferential direction, and shift to the position of the layer L2 at the pinna shaped vertex 23t and further extend in the circumferential direction. , Enters layer L2 of the slot of the sixth slot pitch. Here, the segment conductor 23 is disposed under the segment conductor 27 from the layer L1 to the lead portion side 1a until reaching the vertex portion 23t, and enters the layer L2 of the slot of the sixth slot pitch from the vertex portion 23t. Up to the segment conductor 27 is disposed. The

apex portions

27t and 23t have an upwardly convex chevron shape, and a one-slot pitch shift occurs according to the one-slot pitch shift of the

segment conductors

27 and 23. The

vertex portions

27t and 23t are shift points at which the

segment conductors

27 and 23 shift from the layer L1 to the layer L2, but are shifted by one slot pitch. For this reason, the intersection where the upper and lower sides of the

segment conductors

27 and 23 are interchanged is performed at the positions of the

vertex portions

27t and 23t. By performing this intersection, the height at each coil end can be suppressed without twisting the flat wire.

FIG. 4 is a perspective view showing a winding state when the first two-round continuous coils CA2 to CA4 having the same configuration as the first two-round continuous coil CA1 are sequentially arranged in the outer circumferential direction. As shown in FIG. 3, the first two-turn continuous coil CA2 is alternately wound between the layers L3 and L4. The first two-turn continuous coil CA3 is alternately wound between the layers L5 and L6. Further, the first two-turn continuous coil CA4 is alternately wound between the layers L7 and L8. In this case, the input points a2, a4, a6, a8 and the output points a1, a3, a5, a7 of the first two-turn continuous coil CA (CA1 to CA4) are gathered in the connection region EA and along the radial direction RCA. Each is arranged linearly.

Here, in FIG. 3B, the output point a7 and the input point a6, the output point a5 and the input point a4, and the output point a3 and the input point a2 are connected to reach the output point a1. One wave winding coil is formed. That is, the first two continuous coils CA1 to CA4 are connected in series by the connection in the connection area EA. Further, due to this connection, the conductors arranged in the same slot, for example, the conductors of the layers L1, L3, L5, and L7 at the slot position 7, have the same current direction.

Further, as shown in FIG. 5 (a), the second two-turn continuous coil CB1 having the same configuration as the first two-turn continuous coil CA1 is arranged shifted by 6 slot pitches in the clockwise direction CW side. With this arrangement, the two-layer wave winding in which the second two-turn continuous coil CB1 is wound around the empty layer of each slot in which the first two-turn continuous coil CA1 is wound across the two layers L1 and L2. A coil is formed. Here, since the conductors arranged in the same slot around which the coil is wound, for example, the conductors of the layer L1 and the layer L2 at the slot position 7, need to have the same current direction, the first 2 When the input point a2 of the continuous loop coil CA1 is a current input point, the input point b2 of the second continuous coil CB1 is a current output point, and the output point b1 is a current input point. As a result, as shown in FIG. 5A, the current directions of the coils in the same slot are the same. Note that the input point b2 and the output point b1 of the second two-turn continuous coil CB1 are arranged in a connection region EB shifted by 6 slot pitches from the connection region EA.

Then, as shown in FIG. 5B and FIG. 6, like the first two-round continuous coils CA1 to CA4, the second two-round continuous coils CB2˜ CB4 is sequentially arranged in the outer circumferential direction (radial direction RCB). That is, four two-layer wave winding coils are arranged in the outer peripheral direction. As a result, the input points b2, b4, b6, b8 and the output points b1, b3, b5, b7 of the second continuous coil CB (CB1 to CB4) are gathered in the connection region EB and along the radial direction RCB. Each is arranged linearly.

As shown in FIG. 7, by arranging the above-mentioned first two-round continuous coils CA1 to CA4 and second two-round continuous coils CB1 to CB4, eight layers (L1 to L8) are provided in two adjacent slots. The coils are densely arranged by shifting in the circumferential direction RT by 6 slot pitches.

In the present embodiment, as shown in FIG. 8, in the first two continuous coils CA1 to CA4, the output point a7 and the input point a6, the output point a5 and the input point a4, the output point a3 and the input point a2 are set. Each is connected to form one wave coil U1. Further, in the second two-round continuous coils CB1 to CB4, the input point b8 and the output point b5, the input point b6 and the output point b3, and the input point b4 and the output point b1 are respectively connected to form one wave coil U2. Form. These two wave winding coils U1 and U2 become the parallel wave winding coils U1 and U2 at the time of double star connection.

And, the output point a1 of the first two-turn continuous coil CA1 located in the innermost layer L1 is the neutral point N1 (U1out) of the wave winding coil U1. Further, the input point b2 of the second continuous coil CB1 located in the second layer L2 from the innermost circumference is a neutral point N2 (U2out) of the wave winding coil U2. Furthermore, the input point a8 of the first two-turn continuous coil CA4 located in the outermost layer L8 is the current input point U1in of the wave winding coil U1. Further, the output point b7 of the second two-round continuous coil CB4 located in the second layer L7 from the outermost circumference is the current input point U2in of the wave winding coil U2.

In this case, the current input points U1in and U2in are arranged on the outermost peripheral side. For example, when the two wave winding coils U1 and U2 are U-phase, the current input points U1in and U2in are arranged on the outermost peripheral side of each slot 3. The current input points U1in and U2in can be connected on the outermost peripheral side of the slot 3 to be a U-phase current input point Uin.

Similarly to the U-phase wave winding coils U1 and U2 shown in FIG. 7, the V-phase wave winding coils V1 and V2 and the W-phase wave winding coils W1 and W2 are arranged in two slots in the circumferential direction. A three-phase coil having a double star connection can be generated by arranging adjacently with a pitch shift. That is, as shown in FIG. 8 (b), U-phase wave coils U1, U2, V-phase wave coils V1, V2, and W-phase wave coils W1, W2 are doubled at neutral points N1, N2. A star connected coil can be generated. In FIG. 8B, current input points Uin, Vin, and Win are U-phase, V-phase, and W-phase feed points, respectively. Since the current input points U1in, U2in, V1in, V2in, W1in, W2in are arranged on the outermost peripheral side of each slot 3, each current input connected to the current input points U1in, U2in, V1in, V2in, W1in, W2in The points Uin, Vin, and Win can also be arranged on the outermost peripheral side of each slot 3.

In the present embodiment, as shown in FIG. 9, the neutral point N1 of each phase is connected by a trifurcated segment conductor LN1 having a slot insertion portion. Further, the neutral point N2 of each phase is connected by a trifurcated segment conductor LN2 having a slot insertion portion. In the description of the embodiments so far, the output points a1, a3, a5, a7, b1, b3, b5, b7 and the input points a2, a4, a6, a8, b2, b4, b6, b8 Although the output point and the input point, which are the tips of the conductors, are connected, a pine needle-shaped segment conductor similar to the segment conductor 10 is used for the actual connection.

That is, the wave winding coil U1 connects the output point a7 and the input point a6, the output point a5 and the input point a4, and the output point a3 and the input point a2 with the pine needle-shaped

segment conductors

41, 42, and 43, respectively. The wave winding coil U2 connects the input point b8 and the output point b5, the input point b6 and the output point b4, and the input point b5 and the output point b1 by pine needle-shaped

segment conductors

51, 52, and 53, respectively. Here, the segment conductor 10 is shifted to the outer peripheral layer by one layer at the apex portion while extending six pitches in the clockwise direction CW, whereas the

segment conductors

41, 42, and 43 are in the clockwise direction CW. Shifts to the inner circumference by one layer at the apex while extending 7 slots pitch, and the

segment conductors

51, 52, 53 extend by three layers at the apex while extending by 7 slots in the clockwise direction CW. Shift to. Similarly to the segment conductor 10, the

segment conductors

41, 42, 43, 51, 52, and 53 are bent so as to spread in the circumferential direction RT and their tips are welded. Therefore, welding on the lead portion side 1a is not necessary when connecting the first two-turn continuous coils CA1 to CA4 and the second two-turn continuous coils CB1 to CB4. As a result, the height of the coil end on the lead portion side 1a can be suppressed.

FIG. 10 is a perspective view of the rotating electrical machine stator as viewed from the lead portion side 1a. As shown in FIG. 10, at the coil end on the lead portion side 1a, the neutral point N1 is connected by the trifurcated segment conductor LN1 at the innermost circumference corresponding to the layer L1, and the second layer L2 from the innermost circumference is connected. At a corresponding position, the neutral point N2 is connected by a three-pronged segment conductor LN2. As a result, the two conductors connecting the neutral points N1 and N2 can be arranged adjacent to each other in the radial direction and do not overlap in the direction of the central axis AX. For this reason, the height of the coil end 5a on the lead portion 1a side can be minimized.

In addition, as shown in FIG. 11, the segment conductors LN1 and LN2 may bundle three segment conductors and connect the neutral points N1 and N2. In FIG. 11, the segment conductors of the current input points U1in and U2in are bundled to be the current input point Uin, the segment conductors of the current input points V1in and V2in are bundled to be the current input point Vin, and the segment conductors of the current input points W1in and W2in are The current input point Win is bundled.

In this embodiment, as shown in FIG. 10, the coil end 5a on the lead portion side 1a does not require welding, and the current input points U1in, U2in, V1in, V2in, W1in, W2in are arranged on the outermost periphery. Therefore, the height of the coil end 5a can be suppressed.

Further, the first two-round continuous coil CA and the second two-round continuous coil CB are connected by the shortest three-pronged segment conductors LN1, LN2 on the inner circumference side, and between the first two-round continuous coils CA1 to CA4, Also, since the second two-round continuous coils CB1 to CB4 are connected by the shortest segment conductors 41 to 43 and 51 to 53, the coil circumferential length is shortened, and the resistance value of the coil can be suppressed.

Furthermore, as shown in FIG. 12, since only the coil end 5b on the side opposite to the lead portion 1b is subjected to welding or insulation coating, the work process is simplified and the insulation quality can be improved.

Summarizing the connection of the U-phase wave winding coils described above, the first two-turn continuous coils CA1 to CA4 and the second two-turn continuous coils CB1 to CB4 are connected as shown in FIG. The U-phase wave winding coil U1 is connected to the input point a8 of the first two-round continuous coil CA4 in which the current input point U1in is arranged in the layer L8. The output point a7 of the first two-turn continuous coil CA4 arranged in the layer L7 and the input point a6 of the first two-turn continuous coil CA3 arranged in the layer L6 are connected by a pine needle-shaped segment conductor 41. An output point a5 of the first two-turn continuous coil CA3 arranged in the layer L5 and an input point a4 of the first two-turn continuous coil CA2 arranged in the layer L4 are connected by a pine needle-shaped segment conductor 42. An output point a3 of the first two-turn continuous coil CA2 arranged in the layer L3 and an input point a2 of the first two-turn continuous coil CA1 arranged in the layer L2 are connected by a pine needle-shaped segment conductor 43. The output point a1 of the first two-turn continuous coil CA1 arranged in the layer L1 is connected to the neutral point LN1 by a pine needle-shaped segment conductor.

Meanwhile, the U-phase wave winding coil U2 is connected to the output point b7 of the second two-round continuous coil CB4 in which the current input point U2in is arranged in the layer L7. An input point b8 of the second two-round continuous coil CB4 arranged in the layer L8 and an output point b5 of the second two-round continuous coil CB3 arranged in the layer L5 are connected by a pine needle-shaped segment conductor 51. An input point b6 of the second two-round continuous coil CB3 arranged in the layer L6 and an output point b3 of the second two-round continuous coil CB2 arranged in the layer L3 are connected by a pine needle-shaped segment conductor 52. An input point b4 of the second two-round continuous coil CB2 arranged in the layer L4 and an output point b1 of the second two-round continuous coil CB1 arranged in the layer L1 are connected by a pine needle-shaped segment conductor 53. The input point b2 of the second two-turn continuous coil CB1 arranged in the layer L2 is connected to the neutral point LN2 by a pine needle-shaped segment conductor.

The U-phase wave winding coils U1 and U2 described above are eight (8-turn) two-round continuous coils, which are the first two-round continuous coils CA1 to CA4 and the second two-round continuous coils CB1 to CB4. However, for example, as shown in FIGS. 14 to 18, the same applies to 4 turns, 6 turns, 10 turns, 12 turns, and 14 turns.

Here, FIG. 19 is a diagram that generalizes the connection relationship of the pine needle-shaped segment conductors for connecting the respective two-round continuous coils in the first two-round continuous coil CA and the second two-round continuous coil CB. is there. Here, two continuous coils wound over two adjacent layers by wave winding are each N / 2 in the radial direction with respect to the number of turns N (N also means the number of layers and the number of turns). Arranged adjacent to each other. The first two-turn continuous coil CA includes N / 2 first two-turn continuous coils CA1 to CA (N / 2) with respect to the number N of turns. The second two-round continuous coil CB includes N / 2 second two-round continuous coils CB1 to CB (N / 2) with respect to the number N of turns. Further, the first two-turn continuous coil CA and the second two-turn continuous coil CB are arranged with a 6-slot pitch shift.

Input points a2, a4,..., A (N-6), a (N-4), a (N-2), and a (N) corresponding to the input point a2 and the like of the first continuous coil CA are , Layers (N-2m), (N-2 (m-1)), ..., (N-6), (N-4), (N-2), (N), and the central axis It arrange | positions on the straight line extended radially from AX. Output points a1, a3,..., A (N-7), a (N-5), a (N-3), a (N-1) corresponding to the output point a1, etc. of the first two-turn continuous coil CA ) Are arranged in layers (N− (2m + 1)), (N− (2m−1)),..., (N−7), (N−5), (N−3), and (N−1). And arranged on a straight line extending radially from the central axis AX. Note that m is an integer equal to or greater than 1, and N is N = 2m + 2.

The first two-turn continuous coil CA has a layer (N−1) between the output point a (N−1) of the layer (N−1) and the input point a (N−2) of the layer (N−2). -3) between the output point a (N-3) and the input point a (N-4) of the layer (N-4), the output point a (N-5) of the layer (N-5) and the layer ( Between the input point a (N-6) of N-6), ..., the output point a (N- (2m-1)) = a3 of layer (N- (2m-1)) and layer (N-2m) ) Input points a (N−2m) = a2 are connected by pine needle-shaped segment conductors.

Similarly, input points b2, b4,..., B (N-6), b (N-4), b (N-2), b (corresponding to the input point b2 etc. of the second two-turn continuous coil CB N) are arranged in layers (N-2m), (N-2 (m-1)), ..., (N-6), (N-4), (N-2), (N), and Are arranged on a straight line extending radially from the central axis AX. Output points b1, b3,..., B (N-7), b (N-5), b (N-3), b (N−1) corresponding to the output point b1 of the second continuous coil CB, etc. ) Are arranged in layers (N− (2m + 1)), (N− (2m−1)),..., (N−7), (N−5), (N−3), and (N−1). And arranged on a straight line extending radially from the central axis AX.

The second continuous coil CB is between the input point b (N) of the layer (N) and the output point b (N-3) of the layer (N-3). Between the input point b (N-2) and the output point b (N-5) of the layer (N-5), the input point b (N-4) of the layer (N-4) and the layer (N-7) ... Between the output point b (N−7) and the input point b (N−2 (m−1)) = b4 of the layer (N−2 (m−1)) and the layer (N− (2m + 1)). ) Output point b (N− (2m + 1)) = b1 is connected by a pine needle segment conductor.

That is, m is an integer equal to or greater than 1, and the number of turns N in the radial direction is N = 2m + 2, and the first continuous coil CA has a layer (N−) at the position of the number of turns (N− (2m−1)). The pine needle is between the output point a (N- (2m-1)) of (2m-1)) and the input point a (N-2m) of the layer (N-2m) at the position of the number of turns (N-2m) Connected with segmented conductors. The second continuous coil CB has the input point b (N-2 (m−1) of the layer (N−2 (m−1)) at the position of the number of turns (N−2 (m−1)). )) And the output point b (N- (2m + 1)) of the layer (N- (2m + 1)) at the position of the number of turns (N- (2m + 1)) is connected by a pine needle-shaped segment conductor.

In any case, at the position corresponding to the innermost layer L1, the output point a1 of the first two-turn continuous coil CA becomes the neutral point N1 (U1out) and corresponds to the second layer L2 from the innermost circumference. The input point b2 of the second two-turn continuous coil CB becomes a neutral point N2 (U2out), and the neutral point N1 of each phase is connected by the segment conductor LN1 on the innermost peripheral side. The neutral point N2 is connected by the segment conductor LN2 on the innermost peripheral side.

In the connection relationship shown in FIG. 19, the neutral point N1 (U1out) and the neutral point N2 (U2out) are connected to the segment conductor LN1 and the segment conductor LN2 on the inner peripheral side, respectively, and the current input point U1in and the current input point U2in Are connected to the current input point Uin on the U-phase feeder line side on the outer peripheral side, but as shown in FIG. 20, the neutral point N1 (U1out) and the neutral point N2 (U2out) are arranged on the outer peripheral side, The current input point U1in and the current input point U2in may be arranged on the inner peripheral side. That is, the input point a (N) is connected to the neutral point N1 (U1out), the output point b (N-1) is connected to the neutral point N2 (U2out), and the output point a1 (= a (N− ( 2m + 1))) may be connected to the current input point U1in, and the input point b2 (= b (N−2m)) may be connected to the current input point U2in. In this case, an increase in coil end height due to the coupling of the neutral points N1 and N2 can be suppressed.

In the present embodiment, as shown in FIG. 21, the slot 3 has a semi-closed slot shape having a flange extending in the circumferential direction from the tip of the tooth 2. Thereby, magnetic flux leakage on the inner peripheral surface of the stator core 1 can be suppressed. In addition, in the case of an open slot shape that does not have a flange, it is necessary to provide a notch for holding the wedge inserted on the innermost peripheral side of the slot 3 at the tip end portion of the tooth 2, In the case of the semi-closed slot shape, the wedge is caught on the collar portion, so that it is not necessary to provide a notch.

In the above-described embodiment, 48 annular slots 3 are formed, the number of poles of the rotor is 8, and the first two-round continuous coil CA and the second two-round continuous coil CB are arranged at a six-slot pitch. In general, when the number of slots is Ns and the number of poles of the rotor is Np, the first two-round continuous coil CA and the second two-round continuous coil CB are (Ns / Np) What is necessary is just to shift the slot pitch of minutes.

Furthermore, in the above-described embodiment, a double star connection having two neutral points N1 and N2 is used. However, this double star connection includes two wave winding coils U1 and U2 arranged in parallel as one neutral point. It is preferable to connecting. This is because one neutral point causes a circulating current between the two wave winding coils U1 and U2.

1 Stator core 2 Teeth 3 Slot

1a Lead side

1b Non-lead side 5a,

5b Coil end

10, 21, 21a, 21b, 22-28, 41-43, 51-53, LN1,

LN2 Segment conductors

23t, 27t Vertex a1, a3, a5, a7, a9, a11, a13, b1, b3, b5, b7, b9, b11, b13 Output points a2, a4, a6, a8, a10, a12, a14, b2, b4, b6, b8 , B10, b12, b14 Input points CA, CA1 to CA4 First two-turn continuous coil CB, CB1 to CB4 Second two-turn continuous coil CW Clockwise direction EA, EB Connection region L1 to L14 Layer N1, N2 Neutral Point RT Circumferential direction RCA, RCB Radial direction T21 to T28 Welded part U1, U2, V1, V2, W1, W2 Wave winding coil

Claims

A winding structure of a rotating electrical machine stator in which a coil is wave-wound at a predetermined slot pitch on a stator core in which a plurality of teeth and a plurality of slots are alternately and annularly formed in a circumferential direction,
The same as the first two-round continuous coil and the first two-round continuous coil in which an input point and an output point are formed on the lead portion side, and two rows of coils are wound in a circumferential direction at a predetermined slot pitch. A plurality of two-layer wave winding coils having a structure and comprising a second two-round continuous coil arranged with a shift of the predetermined slot pitch with respect to the circumferential direction with respect to the first two-round continuous coil. And arranging the input point and the output point of the first two-round continuous coil in the same radial direction, and each of the input point and the output point of the second two-round continuous coil Are arranged in the same radial direction,
The output point of the first two-round continuous coil on the outer peripheral side adjacent in the radial direction and the input point of the first two-round continuous coil on the inner peripheral side are sequentially connected, and the outer peripheral side adjacent in the radial direction is connected. The input point of the second two-round continuous coil and the output point of the second two-round continuous coil on the inner circumference side are sequentially connected, and the output point of the first two-round continuous coil on the innermost circumference and the innermost point The first neutral point and the second neutral point of the double star connection are the input points of the second two-round continuous coil located in the second outer peripheral layer from the circumference, and the first outermost circumference is the first neutral point. The first current of the two one-phase coils that are double-star connected to the input point of the two-round continuous coil and the output point of the second two-round continuous coil located in the second inner circumferential side layer from the outermost circumference As an input point and a second current input point,
At least the first neutral point of each phase and the second neutral point of each phase are connected to segment conductors having slot insertion portions, and are arranged at positions shifted by one layer in the radial direction. A winding structure of a rotating electric machine stator characterized by the above.
A winding structure of a rotating electrical machine stator in which a coil is wave-wound at a predetermined slot pitch on a stator core in which a plurality of teeth and a plurality of slots are alternately and annularly formed in a circumferential direction,
The same as the first two-round continuous coil and the first two-round continuous coil in which an input point and an output point are formed on the lead portion side, and two rows of coils are wound in a circumferential direction at a predetermined slot pitch. A plurality of two-layer wave winding coils having a structure and comprising a second two-round continuous coil arranged with a shift of the predetermined slot pitch with respect to the circumferential direction with respect to the first two-round continuous coil. And arranging the input point and the output point of the first two-round continuous coil in the same radial direction, and each of the input point and the output point of the second two-round continuous coil Are arranged in the same radial direction,
The output point of the first two-round continuous coil on the outer peripheral side adjacent in the radial direction and the input point of the first two-round continuous coil on the inner peripheral side are sequentially connected, and the outer peripheral side adjacent in the radial direction is connected. The input point of the second two-round continuous coil and the output point of the second two-round continuous coil on the inner circumference side are sequentially connected, and the output point of the first two-round continuous coil on the innermost circumference and the innermost point The first current input point and the second current input point of two one-phase coils that are double-star connected are the input points of the second two-round continuous coil located in the second outer peripheral layer from the circumference. The input point of the first outermost continuous coil on the outermost periphery and the output point of the second continuous coil on the second innermost side from the outermost periphery are connected to the first center of the double star connection. The sex point and the second neutral point,
At least the first neutral point of each phase and the second neutral point of each phase are connected to segment conductors having slot insertion portions, and are arranged at positions shifted by one layer in the radial direction. A winding structure of a rotating electric machine stator characterized by the above.
The first two-round continuous coil and the second two-round continuous coil insert a pine needle-shaped segment conductor into the slot from the lead portion side, and weld the end of the segment conductor on the non-lead portion side,
The connection between the output point of the first two-round continuous coil on the outer peripheral side adjacent in the radial direction and the input point of the first two-round continuous coil on the inner peripheral side, and the outer peripheral side adjacent in the radial direction The connection point between the input point of the second two-round continuous coil and the output point of the second two-round continuous coil on the inner peripheral side is connected by a pine needle-shaped segment conductor having a slot insertion portion. The winding structure of the rotating electrical machine stator according to claim 1 or 2.
m is an integer greater than or equal to 1, and the number of turns N in the radial direction is N = 2m + 2. The input point at the position (N-2m) is connected by a pine needle-shaped segment conductor having a slot insertion portion, and the number of turns (N-2) The input point at the position (m−1)) and the output point at the position of the number of turns (N− (2m + 1)) are connected by a pine needle-shaped segment conductor having a slot insertion portion. The winding structure of the rotating electric machine stator according to any one of claims 1 to 3.
The first two-turn continuous coil and the second two-turn continuous coil are wound so as to intersect in the radial direction at predetermined slot pitches, respectively. Winding structure of the rotating electrical machine stator described in 1.
6. The winding structure of a rotating electrical machine stator according to claim 1, wherein the predetermined slot pitch is a value obtained by dividing the number of slots by the number of poles of the rotor.
The rotating electrical machine stator winding structure according to any one of claims 1 to 6, wherein the slot has a semi-closed slot shape.