JP2018157709A - Rotary electric machine and stator winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a rotary electric machine.SOLUTION: A rotary electric machine 10 includes: a three-phase stator winding 41 configured such that four coils are connected in parallel to form a wave winding system so as to have four parallel circuits Lu, Lv, Lw in a U phase, a V phase, and a W phase, respectively; and a stator core 32 including a plurality of slots 31 storing two each of four coils constituting an in-phase parallel circuit in two slots 31 arranged consecutively in the circumferential direction in correspondence to magnetic poles of a rotor 20.SELECTED DRAWING: Figure 4

Description

  The disclosed embodiment relates to a rotating electrical machine and a stator winding.

  Patent Document 1 discloses a vehicle in which a plurality of segments, which are U-shaped electric conductors, are inserted into slots of a stator core, and then the segments are joined in series to form a wave winding for one phase. AC generators are described.

JP-A-11-155270

  When the vehicle AC generator is to be reduced in size, further optimization of the device configuration is desired.

  The present invention has been made in view of such problems, and an object thereof is to provide a rotating electrical machine and a stator winding that can be reduced in size.

  In order to solve the above-described problem, according to one aspect of the present invention, a three-phase structure in which a plurality of coils are connected in parallel to form a wave winding system so as to have two or more parallel circuits in each phase. And a stator core having a plurality of slots each accommodating two or more coils constituting the parallel circuit of the same phase.

  According to still another aspect of the present invention, a stator winding mounted on a stator core of a rotating electrical machine, wherein a plurality of coils are connected in parallel so that each phase has two or more parallel circuits. The stator winding is configured so that the two or more coils constituting the parallel circuit of the same phase are accommodated in the slots of the stator core, respectively. Is done.

  According to the present invention, it is possible to reduce the size of a rotating electrical machine.

It is a longitudinal cross-sectional view showing an example of the whole structure of the rotary electric machine which concerns on embodiment. It is a cross-sectional view by the II-II cross section in FIG. It is a circuit diagram showing an example of a structure of the parallel circuit of a stator winding | coil. It is explanatory drawing showing the specific example of the arrangement configuration of a U-phase coil. It is explanatory drawing showing the specific example of the arrangement configuration of a V-phase coil. It is explanatory drawing showing the specific example of the arrangement configuration of a W-phase coil. It is explanatory drawing showing the specific example of the arrangement configuration of the U-phase coil of a 1st modification. It is explanatory drawing showing the specific example of the arrangement structure of the U-phase coil of a 2nd modification. It is explanatory drawing showing the specific example of the arrangement configuration of the U-phase coil of a 3rd modification. It is explanatory drawing showing the specific example of the arrangement structure of the U-phase coil of a 4th modification. It is explanatory drawing showing the specific example of the arrangement structure of the U-phase coil of a 5th modification. It is explanatory drawing showing the specific example of the arrangement structure of the U-phase coil of a 6th modification. It is explanatory drawing showing the specific example of the arrangement structure of the U-phase coil of a 7th modification.

  Hereinafter, embodiments will be described with reference to the drawings.

<1. Overall configuration of rotating electrical machine>
First, an example of the overall configuration of the rotating electrical machine 10 according to the present embodiment will be described with reference to FIGS. 1 and 2. The rotating electrical machine 10 is used as a motor or a generator.

  As shown in FIGS. 1 and 2, the rotating electrical machine 10 includes a rotor 20, a stator 30, a frame 11, a load side bracket 12, an antiload side bracket 14, a load side bearing 13, and an antiload. It has a side bearing 15 and an encoder 17.

  In the present specification, the “load side” refers to the direction in which the load is attached to the rotating electrical machine 10, that is, the direction in which the shaft 16 protrudes in this example (the right side in FIG. 1 and the front side in FIG. 2). “An anti-load side” refers to a direction opposite to the load side, that is, in this example, a direction in which the encoder 17 is arranged with respect to the rotating electrical machine 10 (left side in FIG. 1, back side in FIG. 2).

  The stator 30 is provided on the inner periphery of the cylindrical frame 11. The rotor 20 is disposed on the inner peripheral side of the stator 30. The rotor 20 includes a shaft 16.

  The load side bracket 12 is provided on the load side of the frame 11, and the anti-load side bracket 14 is provided on the anti-load side of the frame 11. A dust seal 18 is provided at the load side end of the load side bracket 12. The dust seal 18 suppresses entry of foreign matter into the rotating electrical machine 10.

  The load side bearing 13 is provided on the load side bracket 12, and the anti-load side bearing 15 is provided on the anti-load side bracket 14. The shaft 16 is supported by the load side bearing 13 and the anti-load side bearing 15 so as to be rotatable around the rotation axis AX.

  In the present specification, the “axial direction” refers to the direction along the rotational axis AX, the “circumferential direction” refers to the circumferential direction around the rotational axis AX, and the “radial direction” refers to the rotational axis AX as the center. It is the radial direction to do.

  A load side plate 8 is attached between the load side bearing 13 of the shaft 16 and the rotor 20, and an anti load side plate 9 is attached between the anti load side bearing 15 of the shaft 16 and the rotor 20. It has been. The load side plate 8 and the anti-load side plate 9 restrict the movement of the rotor 20 in the axial direction. A positioning side plate 7 is attached between the load side plate 8 and the load side bearing 13 of the shaft 16. The encoder 17 is provided at the end on the opposite side of the shaft 16. The encoder 17 detects the rotational position of the shaft 16.

  In this example, the rotating electrical machine 10 includes the encoder 17, but may include a rotational position detection unit (such as a resolver) other than the encoder, or may not include the encoder 17.

  As shown in FIG. 2, the rotor 20 includes a rotor core 22 and a plurality of permanent magnets 23. The rotor core 22 is attached to the outer peripheral surface of the shaft 16 and is disposed opposite to the inner peripheral surface of the stator 30 in the radial direction via a magnetic gap. A plurality (16 in this example) of permanent magnets 23 are embedded in the rotor core 22 in a V shape for each pole, and a plurality of poles (8 poles in this example) are formed in the circumferential direction of the rotor core 22. doing. A through hole 21 is formed in the rotor core 22, and the rotor core 22 is fixed to the outer peripheral surface of the shaft 16 by fitting the through hole 21 with the shaft 16.

  In this example, the rotor 20 is configured such that the permanent magnet 23 is embedded in the rotor core 22 in a V shape. However, the permanent magnet 23 is formed in an I shape along the radial direction in the rotor core 22. It is good also as an embedded structure. In this example, the rotor 20 has a so-called IPM (Internal Permanent Magnet) configuration in which the permanent magnet 23 is embedded in the rotor core 22, but the permanent magnet 23 is provided on the surface of the rotor core 22. A so-called SPM (Surface Permanent Magnet) type configuration may be used.

  As shown in FIG. 2, the stator 30 includes a substantially annular stator core 32 in which a plurality (48 in this example) of slots 31 are arranged over the entire circumference, and a plurality of slots 31 in a wave winding manner. And a mounted stator winding 41. As shown in FIG. 1, a connection portion 44 in which a plurality of coils constituting the stator winding 41 are connected is disposed on the end surface on the opposite side of the stator core 32. An external power supply (not shown) is connected to the connection portion 44 via a lead wire (not shown), and power is supplied from the external power supply to the stator winding 41 via the lead wire and the connection portion 44.

  The stator core 32 includes a plurality of teeth portions 34 having a substantially rectangular cross section on the inner peripheral side. The slot 31 is formed between adjacent tooth portions 34 and 34. The stator winding 41 is mounted in a plurality of slots 31 by a wave winding method, and is integrally molded and solidified with an appropriate molding resin. Note that resin molding may not be performed. The stator core 32 may be composed of a plurality of core pieces (so-called split cores).

  In addition, the structure of the rotary electric machine 10 demonstrated above is an example, and structures other than the above may be sufficient. For example, although the case where the slot combination of the rotating electrical machine has 8 poles and 48 slots has been described above as an example, other slot combinations may be used.

  <2. Configuration of parallel circuit of stator winding>

  Next, an example of the parallel circuit configuration of the stator winding 41 will be described with reference to FIG.

  As shown in FIG. 3, the stator winding 41 includes a plurality of coils so that each of U, V, and W has two or more (4 in the present embodiment) parallel circuits Lu, Lv, and Lw. It is configured to be connected in parallel. That is, the U-phase stator winding 41 has four coils U1, U2, U3, and U4 that constitute four parallel circuits Lu, respectively. The V-phase stator winding 41 has four coils V1, V2, V3, and V4 that constitute four parallel circuits Lv, respectively. The W-phase stator winding 41 has four coils W1, W2, W3, and W4 that respectively constitute four parallel circuits Lw. Each of the U-phase, V-phase, and W-phase coils has a winding start side connected to the connecting portion 44 and a winding end side connected to the neutral point N.

  In FIG. 3, the case where the circuit configuration is a Y connection is illustrated as an example, but a circuit configuration such as a Δ connection or a Y-Δ connection may be used.

  <3. Arrangement of coils constituting the stator winding>

  Next, an example of the arrangement configuration of the coils constituting the stator winding 41 will be described with reference to FIGS. In the following description, the number of slots 31 of each phase assigned corresponding to each magnetic pole of the rotor 20 is the number of pole slots q per phase, the number of parallel circuits of each phase is the number of parallel circuits z, and the constant n In the following description, half the number of magnetic poles of the rotor 20 (number of poles / 2) is defined as the number p of pole pairs. The constant n is an integer of 1 or more when z ≦ p and the number of pole slots per phase q or less (1 ≦ n ≦ q), and an integer of 1 or more and pq / z or less when z> p (1 ≦ 1). n ≦ pq / z).

  The stator winding 41 is configured so that the number of slots per pole per phase q is smaller than the number of parallel circuits z (q <z), in other words, the coils constituting the in-phase parallel circuit accommodated in one slot 31. The number is configured to be 2 or more (z / q). In addition, the winding start positions of two or more coils constituting the in-phase parallel circuit accommodated in one slot 31 are arranged at equal intervals in the circumferential direction. Specifically, the winding start positions of the two or more coils are arranged for each mechanical angle represented by 360 ° × (n / z) when z ≦ p, and 360 ° × when z> p. It arrange | positions for every mechanical angle represented by (n / p). Further, among the two or more coils constituting the in-phase parallel circuit accommodated in one slot 31, the coil constituting one parallel circuit is connected to the coil at the winding start position of the coil constituting the other parallel circuit. The layer (number of turns) is changed to overlap in the radial direction.

  In the stator winding 41, the number of pole slots q per phase is 2 or more, that is, two or more coils constituting a parallel circuit of the same phase are continuous in the circumferential direction corresponding to each magnetic pole of the rotor 20. Are configured to be accommodated in two or more slots 31, respectively. Furthermore, the stator winding 41 is configured such that two or more coils constituting the in-phase parallel circuit are accommodated in the slots 31 while being sequentially changed along the radial direction.

  As described above, the rotating electrical machine 10 has the number of magnetic poles of the rotor 20, the number of slots 31 of the stator 30 is 48, and has a slot combination of 8P48S. Becomes 2. The number of parallel circuits z is 4, and the number of pole pairs p is 4. Therefore, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 2 (z / q). Further, since z ≦ p and the constant n is 1 ≦ n ≦ q, for example, when the constant n is 2, the winding start positions of the two coils accommodated in one slot 31 are 180 mechanical angles. It arrange | positions for every (360 degrees x (n / z)). Therefore, the number of turns of each coil increases every 180 °, in other words, every time the stator core 32 is made a half turn (n / z turn) in the circumferential direction. Hereinafter, a specific example of the arrangement configuration of the coils of each phase when the number of slots per pole per phase q = 2, the number of parallel circuits z = 4, and the constant n = 2 will be described.

(3-1. Specific example of U-phase coil arrangement)
FIG. 4 is an explanatory diagram showing an example of the arrangement configuration of the U-phase coil, and schematically shows the arrangement configuration of the U-phase coil accommodated in the plurality of slots 31 of the stator core 32 in the circumferential direction. Yes. As described above, the U-phase stator winding 41 includes the four coils U1, U2, U3, and U4 that constitute the four parallel circuits Lu, respectively.

  In FIG. 4, the coil U1 is No. 1 in the first turn. No. 48 slot is the winding start position, and the accommodation direction is alternately changed from one side to the other side in the axial direction and from the other side to the one side. 7, no. 12, no. Each of the 19 slots is accommodated. No. which is the winding start position of the coil U3. The number of turns increases in 24 slots, and the accommodation direction is alternately changed in the second turn while No. 2 is changed. 24, no. 31, no. 36, no. It is accommodated in 43 slots. No. which is the winding start position of its own coil U1. The number of turns increases in 48 slots, and in the third turn, no. 48, no. 7, no. 12, no. Each of the 19 slots is accommodated. No. which is the winding start position of the coil U3. The number of turns increases in 24 slots. 24, no. 31, no. 36, no. It is accommodated in 43 slots. After that, they are similarly accommodated at the 5th, 6th, 7th and 8th turns. And No. which is the winding start position of own coil U1. The number of turns increases in 48 slots. 48, no. 7, no. No. 12 slots are accommodated in each slot. Nineteen slots are winding end positions.

  The coil U2 is accommodated in the slot 31 adjacent to the coil U1. The coil U2 is No. 1 in the first turn. No. 1 becomes the winding start position, and the accommodation direction is changed alternately from one side to the other side in the axial direction and from one side to the other side. 6, no. 13, no. Each is accommodated in 18 slots. No. which is the winding start position of the coil U4. The number of turns increases in the 25th slot, and the accommodation direction is alternately changed in the second turn while No. 2 is changed. 25, no. 30, no. 37, no. Each of the slots is accommodated in 42 slots. No. which is the winding start position of its own coil U2. The number of turns increases in slot 1, and No. 1 is the same in turn 3. 1, no. 6, no. 13, no. Each is accommodated in 18 slots. No. which is the winding start position of the coil U4. The number of turns increases in 25 slots. 25, no. 30, no. 37, no. Each of the slots is accommodated in 42 slots. After that, they are similarly accommodated at the 5th, 6th, 7th and 8th turns. And No. which is the winding start position of own coil U2. The number of turns increases in slot 1 and No. 9 turns. 1, no. 6, no. Each of the slots is accommodated in each of the 13 slots. Eighteen slots are the winding end position.

  The coil U3 is accommodated in the same slot 31 as the coil U1. The coil U3 is No. 1 in the first turn. No. 24 slot becomes the winding start position, and the accommodation direction is changed alternately from one side to the other side in the axial direction and from one side to the other side. 31, no. 36, no. It is accommodated in 43 slots. No. which is the winding start position of the coil U1. The number of turns increases in the 48 slots, and the accommodation direction is alternately changed in the second turn while No. 4 is changed. 48, no. 7, no. 12, no. Each of the 19 slots is accommodated. No. which is the winding start position of its own coil U3. The number of turns is increased in 24 slots, and in the third turn, the number is similarly changed. 24, no. 31, no. 36, no. It is accommodated in 43 slots. No. which is the winding start position of the coil U1. The number of turns increases in 48 slots. 48, no. 7, no. 12, no. Each of the 19 slots is accommodated. After that, they are similarly accommodated at the 5th, 6th, 7th and 8th turns. And No. which is the winding start position of own coil U3. The number of turns increases in 24 slots. 24, no. 31, no. Each of the 36 slots accommodates No. 36. 43 slots are the winding end position.

  The coil U4 is accommodated in the slot 31 adjacent to the coil U3, and is accommodated in the same slot 31 as the coil U2. Coil U4 has slot No. 1 in the first turn. No. 25 slot is the winding start position and the accommodation direction is changed alternately from one side to the other side in the axial direction and from the other side to the one side. 30, no. 37, no. Each of the slots is accommodated in 42 slots. No. which is the winding start position of the coil U2. The number of turns increases in the slot 1 and the accommodation direction is changed alternately in the second turn. 1, no. 6, no. 13, no. Each is accommodated in 18 slots. No. which is the winding start position of its own coil U4. The number of turns increases in the 25th slot. 25, no. 30, no. 37, no. Each of the slots is accommodated in 42 slots. No. which is the winding start position of the coil U2. The number of turns increases in slot 1, and No. 4 is the same in turn 4. 1, no. 6, no. 13, no. Each is accommodated in 18 slots. After that, they are similarly accommodated at the 5th, 6th, 7th and 8th turns. And No. which is the winding start position of own coil U3. The number of turns increases in 25 slots. 25, no. 30, no. No. 37, respectively. 42 slots are the winding end position.

  As described above, the four coils U1, U2, U3, and U4 constituting the four U-phase parallel circuits Lu are respectively disposed in the two slots 31 that are continuously arranged in the circumferential direction, and the coils U1 and U2 and the coils U3 and U4. It is housed in two sets. Further, the winding start positions of the two coils U1 and U3 accommodated in the same slot 31 are arranged at intervals of 180 ° in the circumferential direction, and each of the two coils U2 and U4 accommodated in the same slot 31 is similarly provided. The winding start positions of are arranged at intervals of 180 ° in the circumferential direction. Further, the two coils U1 and U3 accommodated in the same slot 31 are changed in layer so that the coil U1 overlaps in the radial direction at the winding start position of the coil U3, and the coil U3 is in the radial direction at the winding start position of the coil U1. The layer is changed to overlap. Similarly, the layers of the two coils U2 and U4 accommodated in the same slot 31 are changed so that the coil U2 overlaps in the radial direction at the winding start position of the coil U4, and the coil U4 has a diameter at the winding start position of the coil U2. The layers are changed to overlap in the direction. As a result, in the slots 31 (for example, No. 48, No. 24, etc.) in which the coils U1, U3 are accommodated, the coils U1, U3 are alternately accommodated in order along the radial direction, and the coils U2, U4 are accommodated. In the slots 31 to be accommodated (for example, No. 1 and No. 25), the coils U2 and U4 are alternately accommodated while being sequentially changed along the radial direction.

(3-2. Specific example of arrangement configuration of V-phase coil)
FIG. 5 is an explanatory diagram showing an example of the arrangement configuration of the V-phase coil, and schematically shows the arrangement configuration of the V-phase coil accommodated in the plurality of slots 31 of the stator core 32 in the circumferential direction. Yes. As described above, the V-phase stator winding 41 includes the four coils V1, V2, V3, and V4 that constitute the four parallel circuits Lv, respectively.

  In FIG. 5, the arrangement configuration of the coils V1, V2, V3, V4 is an arrangement configuration in which the arrangement configuration of the coils U1, U2, U3, U4 shown in FIG. 4 is moved by 16 slots in the circumferential direction. Since other than that is the same, description is abbreviate | omitted. As a result, the four coils V1, V2, V3, and V4 constituting the four parallel circuits Lv of the V phase are respectively arranged in the two slots 31 that are continuously arranged in the circumferential direction, and the coils V1, V2 and the coils V3, V4. It is housed in two sets. The winding start positions of the two coils V1 and V3 accommodated in the same slot 31 are arranged at intervals of 180 ° in the circumferential direction, and each of the two coils V2 and V4 similarly accommodated in the same slot 31 is provided. The winding start positions of are arranged at intervals of 180 ° in the circumferential direction. The two coils V1 and V3 accommodated in the same slot 31 are changed in layer so that the coil V1 overlaps in the radial direction at the winding start position of the coil V3, and the coil V3 is radially in the winding start position of the coil V1. The layer is changed to overlap. Similarly, the layers of the two coils V2 and V4 accommodated in the same slot 31 are changed so that the coil V2 overlaps in the radial direction at the winding start position of the coil V4, and the coil V4 has a diameter at the winding start position of the coil V2. The layers are changed to overlap in the direction. As a result, in the slots 31 (for example, No. 16, No. 40, etc.) in which the coils V1, V3 are accommodated, the coils V1, V3 are alternately accommodated in order along the radial direction, and the coils V2, V4 are accommodated. In the slot 31 to be accommodated (for example, No. 17, No. 41, etc.), the coils V2 and V4 are alternately accommodated while being sequentially changed along the radial direction.

(3-3. Specific example of arrangement configuration of W-phase coil)
FIG. 6 is an explanatory diagram showing an example of the arrangement configuration of the W-phase coil, and schematically shows the arrangement configuration of the W-phase coil housed in the plurality of slots 31 of the stator core 32 in the circumferential direction. Yes. As described above, the W-phase stator winding 41 includes the four coils W1, W2, W3, and W4 that constitute the four parallel circuits Lw, respectively.

  In FIG. 6, the arrangement configuration of the coils W1, W2, W3, and W4 is an arrangement configuration in which the arrangement configuration of the coils U1, U2, U3, and U4 shown in FIG. Since other than that is the same, description is abbreviate | omitted. As a result, the four coils W1, W2, W3, and W4 constituting the four parallel circuits Lw of the W phase are respectively disposed in the two slots 31 that are continuously arranged in the circumferential direction, and the coils W1, W2 and the coils W3, W4. It is housed in two sets. Further, the winding start positions of the two coils W1 and W3 accommodated in the same slot 31 are arranged at intervals of 180 ° in the circumferential direction, and each of the two coils W2 and W4 similarly accommodated in the same slot 31 is provided. The winding start positions of are arranged at intervals of 180 ° in the circumferential direction. The two coils W1 and W3 accommodated in the same slot 31 are changed in layer so that the coil W1 overlaps in the radial direction at the winding start position of the coil W3, and the coil W3 is in the radial direction at the winding start position of the coil W1. The layer is changed to overlap. Similarly, the layers of the two coils W2 and W4 accommodated in the same slot 31 are changed so that the coil W2 overlaps in the radial direction at the winding start position of the coil W4, and the coil W4 has a diameter at the winding start position of the coil W2. The layers are changed to overlap in the direction. As a result, in the slots 31 (for example, No. 8, No. 32, etc.) in which the coils W1, W3 are accommodated, the coils W1, W3 are alternately accommodated in order along the radial direction, and the coils W2, W4 are accommodated. In the slot 31 to be accommodated (for example, No. 9, No. 33, etc.), the coils W2, W4 are alternately accommodated while being sequentially changed along the radial direction.

  In addition, although the case where the number of turns of each coil is 9 was described above as an example, the number of turns is not limited to 9, and is set to an appropriate number of turns according to the required specifications, performance, etc. of the rotating electrical machine. Is done.

<4. Effects of First Embodiment>
As described above, the rotating electrical machine 10 according to the present embodiment has a three-phase fixed configuration in which a plurality of coils are connected in parallel so as to have two or more parallel circuits in each phase to be a wave winding system. And a stator core 32 having a plurality of slots 31 each accommodating two or more coils constituting a parallel circuit of the same phase. Thereby, there exists the following effect.

  That is, if the stator winding 41 is attached to the stator core 32 by the wave winding method, the coil end can be made smaller than other distributed winding methods. Further, when the stator winding 41 has two or more parallel circuits in each phase, the electric circuit configuration including external devices such as an inverter can be reduced in size as compared with the case of the series circuit. In the present embodiment, each of the plurality of slots 31 accommodates two or more coils constituting a parallel circuit of the same phase, whereby the stator winding 41 having the parallel circuit is formed into the stator core 32 by a wave winding method. The mounted rotating electrical machine 10 can be realized. Therefore, the rotating electrical machine 10 can be reduced in size.

  In the present embodiment, in particular, the stator windings 41 are arranged at equal intervals in the circumferential direction at the respective winding start positions of two or more coils that are housed in one slot 31 and constitute a parallel circuit of the same phase. It is comprised so that.

  Thereby, the winding amount (winding length) in each turn of each coil constituting each parallel circuit can be made substantially uniform. Therefore, it is possible to suppress the occurrence of constant unbalance (unbalance of inductance, impedance, current value, etc.) between the parallel circuits due to the difference in winding amount in each turn.

  Further, in the present embodiment, in particular, the stator winding 41 is configured such that one of the two or more coils constituting the in-phase parallel circuit accommodated in the one slot is a coil constituting one parallel circuit. The layer (the number of turns) is configured so as to overlap the coil in the radial direction at the winding start position of the coil constituting the circuit. Thereby, there exists the following effect.

  For example, when the stator winding 41 has a configuration in which the number of turns is changed for each magnetic pole, the selection of the number of parallel circuits is limited, or the radial direction in order to configure a parallel circuit depending on the number of turns and the number of slots. It may be necessary to provide a bypass circuit between the outermost periphery and the innermost periphery.

  According to the present embodiment, the coils constituting each parallel circuit can be configured to increase the number of turns for each winding start position of the other coils. Therefore, any bypass circuit is not provided as described above. The number of parallel circuits can be selected. Therefore, the degree of freedom in design can be improved and the coil end can be reduced in size.

  In this embodiment, in particular, the rotating electrical machine 10 includes the rotor 20 having a plurality of magnetic poles, and the stator winding 41 includes two or more coils constituting a parallel circuit of the same phase and the magnetic poles of the rotor 20. It is configured so as to be accommodated in two or more slots 31 arranged continuously in the circumferential direction corresponding to each.

  Thereby, since the number of parallel circuits can be increased, the further miniaturization of the rotary electric machine 10 can be achieved. Moreover, since the selection range of the number of turns of the stator winding 41 is widened, the degree of freedom in design can be further improved.

  Further, particularly in the present embodiment, the stator winding 41 is accommodated in each slot 31 while two or more coils constituting the in-phase parallel circuit are sequentially changed along the radial direction of the stator core 32. It is configured. Thereby, there exists the following effect.

  For example, when the coils constituting the two parallel circuits in the slot 31 (for example, the coils U1 and U2 and the coils U3 and U4) are stacked separately on the radially outer side and the inner side, the outer parallel circuit and the inner There is a possibility that constant imbalance (imbalance of inductance, impedance, current value, etc.) due to slot leakage magnetic flux may occur with the parallel circuit. The occurrence of such a constant imbalance can cause deterioration of the characteristics of the rotating electrical machine, vibration, and noise.

  According to the present embodiment, since the coils constituting the two parallel circuits are alternately stacked in the slot 31, the constant unbalance between the parallel circuits can be eliminated. Accordingly, it is possible to prevent the characteristics of the rotating electrical machine 10 from being deteriorated, vibration, noise, and the like.

  In the present embodiment, in particular, the stator winding 41 is configured by connecting a plurality of coils in parallel so as to have four parallel circuits Lu, Lv, and Lw in the U phase, the V phase, and the W phase, In the U phase (the same applies to the V phase and the W phase), four coils U1, U2, U3, and U4 that respectively constitute the four parallel circuits Lu are continuously arranged in the circumferential direction corresponding to each magnetic pole of the rotor 20. The two slots 31 are divided into coils U1 and U3 and coils U2 and U4, respectively, and each of the two coils U1 and U3 (coils U2 and U4) accommodated in the one slot 31 is wound. The starting positions are arranged at 180 ° intervals in the circumferential direction of the stator core 32, and one of the two coils U1 and U3 (coils U2 and U4) accommodated in the one slot 31 has one coil U1 (U2). The other Layer is changed so as to overlap radially winding start position of the coil U3 (U4), it is configured as. Thereby, there exists the following effect.

  That is, in general, as the number of parallel circuits increases, the rotating electrical machine 10 can be further reduced in size, and the selection range of the number of turns of the stator winding 41 can be widened to improve the degree of design freedom. On the other hand, if the number of parallel circuits is too large, it becomes difficult to integrate in the manufacturing process of the stator winding 41, and the manufacturability is lowered. In this embodiment, by setting the number of parallel circuits z in each phase to 4, while obtaining a certain effect on the above-described miniaturization and improvement in the degree of freedom of design, it is possible to avoid the number of parallel circuits z from becoming too large. It can also ensure manufacturability. Further, by setting the number of slots per pole per phase q to 2, the characteristics, strength, output (rotation speed and torque), etc., for example, characteristics that match the requirements for use as a rotating electric machine of an electric vehicle (EV) can be obtained. It is possible to have it. Therefore, the rotary electric machine suitable for the use of an electric vehicle (EV) is realizable.

<5. Modification Example of Coil Arrangement Configuration>
Note that the arrangement of the coils in the disclosed embodiment is not limited to the above-described configuration, and various modifications can be made without departing from the spirit and technical idea thereof. Hereinafter, such modifications will be described. In the following, the case where the number of turns of the coil is 9 will be described as an example. However, as described above, the number of turns is not limited to 9, and may be appropriately changed according to the required specifications and performance of the rotating electrical machine. The

(5-1. When q = 2, z = 8, n = 1, p = 4)
In this modification, the number of pole slots per phase q = 2, the number of parallel circuits of each phase z = 8, a constant n = 1 (because z> p, 1 ≦ n ≦ pq / z), and the number of pole pairs p = This is the case of 4. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 4 (z / q). The winding start positions of the four coils accommodated in one slot 31 are arranged every 90 ° (360 ° × (n / p)) in mechanical angle because z> p. Therefore, the number of turns of each coil increases every 90 °, in other words, every time the stator core 32 is turned 1/4 (n / p) in the circumferential direction.

  FIG. 7 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  In this modification, the U-phase stator winding 41 includes eight coils U1, U2, U3, U4, U5, U6, U7, and U8 that constitute eight parallel circuits Lu, respectively.

  As shown in FIG. 7, two coils U1, U2, U3, U4, U5, U6, U7, and U8 that respectively constitute eight U-phase parallel circuits Lu are arranged continuously in the circumferential direction. The slot 31 is divided into four sets of coils U1 and U2, coils U3 and U4, coils U5 and U6, and coils U7 and U8, and two sets are accommodated. Further, the winding start positions of the four coils U1, U3, U5, U7 accommodated in the same slot 31 are arranged at 90 ° intervals in the circumferential direction, and similarly, the four coils U2 accommodated in the same slot 31 are used. , U4, U6, U8 are arranged at 90 ° intervals in the circumferential direction. In addition, the four coils U1, U3, U5, U7 accommodated in the same slot 31 have their layers changed so that each coil overlaps in the radial direction at the winding start position of the other coil and the winding start position of its own coil. Is done. Similarly, the four coils U2, U4, U6, U8 accommodated in the same slot 31 have layers such that each coil overlaps in the radial direction at the winding start position of the other coil and the winding start position of its own coil. Be changed.

  As a result, in the slots 31 (for example, No. 48, No. 12, No. 24, No. 36, etc.) in which the coils U1, U3, U5, U7 are accommodated, the coils U1, U3, U5, U7 are in the radial direction. Are accommodated alternately while changing the order. For example, no. In the 48 slots, the coils U1, U7, U5, U3,... Also, for example, No. In the 12 slots, the number of turns is accommodated in the order of coils U3, U1, U7, U5. Also, for example, No. In the 24 slots, the coils U5, U3, U1, U7,... Also, for example, No. In the 36 slots, the coils U7, U5, U3, U1,...

  Moreover, in the slot 31 (for example, No.1, No.13, No.25, No.37 etc.) in which the coils U2, U4, U6, U8 are accommodated, the coils U2, U4, U6, U8 are along the radial direction. They are alternately accommodated in turn. For example, no. In one slot, the number of turns is accommodated in the order of coils U2, U8, U6, U4,. Also, for example, No. The thirteen slots accommodate the coils U4, U2, U8, U6,... In the order of the number of turns from small to large. Also, for example, No. In the 25 slots, the coils U6, U4, U2, U8,... Also, for example, No. In the 37 slots, the coils U8, U6, U4, U2...

  Also in this modification, the same effect as the above embodiment can be obtained. Further, by setting the number of parallel circuits to 8, the rotating electrical machine 10 can be further reduced in size, and the range of selection of the number of turns of the stator winding 41 can be widened to further improve the degree of design freedom.

(5-2. When q = 1, z = 4, n = 1, p = 8)
In this modification, the number of pole slots per phase q = 1, the number of parallel circuits z = 4 for each phase, a constant n = 1 (1 ≦ n ≦ q because z ≦ p), and the number of pole pairs p = 8 This is the case. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 4 (z / q). Further, the winding start positions of the four coils accommodated in one slot 31 are arranged every 90 ° (360 ° × (n / z)) in mechanical angle because z ≦ p. Therefore, the number of turns of each coil increases every 90 °, in other words, every time the stator core 32 is turned 1/4 (n / z) in the circumferential direction. In this modification, the rotary electric machine 10 has a slot combination of 16 poles and 48 slots.

  FIG. 8 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  As described above, the U-phase stator winding 41 includes the four coils U1, U2, U3, and U4 that constitute the four parallel circuits Lu, respectively.

  As shown in FIG. 8, the four coils U <b> 1, U <b> 2, U <b> 3, and U <b> 4 that respectively constitute the four U-phase parallel circuits Lu are accommodated in a single slot 31. Further, the winding start positions of the four coils U1, U2, U3, U4 accommodated in the same slot 31 are arranged at 90 ° intervals in the circumferential direction. Further, the four coils U1, U2, U3, U4 accommodated in the same slot 31 have their layers changed so that each coil overlaps in the radial direction at the winding start position of another coil and at the winding start position of its own coil. Is done. As a result, in the slot 31 (for example, No. 48, No. 12, No. 24, No. 36, etc.) in which U1, U2, U3, U4 are accommodated, U1, U2, U3, U4 are along the radial direction. Are accommodated in turn. For example, no. In the 48 slots, the coils U1, U4, U3, U2... Are accommodated in the order of the number of turns from small to large. Also, for example, No. In the 12 slots, the number of turns is accommodated in the order of coils U2, U1, U4, U3,. Also, for example, No. In the 24 slots, the coils U3, U2, U1, U4,... Are accommodated in the order of the number of turns from small to large. Also, for example, No. In the 36 slots, the coils U4, U3, U2, U1,...

  Also in this modification, the same effect as the above embodiment can be obtained.

(5-3. When q = 2, z = 6, n = 2, p = 6)
In this modification, the number of pole slots per phase q = 2, the number of parallel circuits z = 6 for each phase, a constant n = 2 (1 ≦ n ≦ q because z ≦ p), and the number of pole pairs p = 6 This is the case. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 3 (z / q). The winding start positions of the three coils accommodated in one slot 31 are arranged every 120 ° (360 ° × (n / z)) in mechanical angle because z ≦ p. Therefore, the number of turns of each coil increases every 120 °, in other words, every time the stator core 32 is turned 1/3 (n / z) in the circumferential direction. In this modification, the rotating electrical machine 10 has a slot combination of 12 poles and 72 slots.

  FIG. 9 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  The U-phase stator winding 41 includes four coils U1, U2, U3, U4, U5, and U6 that constitute six parallel circuits Lu, respectively. The same applies to the V phase and the W phase.

  As shown in FIG. 9, six coils U1, U2, U3, U4, U5, and U6 that respectively constitute six U-phase parallel circuits Lu are arranged in two slots 31 that are continuously arranged in the circumferential direction. It is divided into three sets of U1 and U2, coils U3 and U4, and coils U5 and U6, and is accommodated two by two. The winding start positions of the three coils U1, U3, U5 accommodated in the same slot 31 are arranged at 120 ° intervals in the circumferential direction, and the three coils U2, U4 similarly accommodated in the same slot 31 are also provided. , U6 are arranged at 120 ° intervals in the circumferential direction. Further, the layers of the three coils U1, U3, U5 accommodated in the same slot 31 are changed so that each coil overlaps in the radial direction at the winding start position of the other coil and the winding start position of its own coil. . Similarly, the layers of the three coils U2, U4, U6 accommodated in the same slot 31 are changed so that each coil overlaps in the radial direction at the winding start position of the other coil and the winding start position of its own coil. The

  As a result, in the slots 31 (for example, No. 72, No. 24, No. 48, etc.) in which the coils U1, U3, U5 are accommodated, the coils U1, U3, U5 are accommodated while being sequentially changed along the radial direction. The For example, no. In the 72 slots, the number of turns is accommodated in the order of coils U1, U5, U3,. No. In the 24 slots, the coils U3, U1, U5. No. In the 48 slots, the coils U5, U3, U1,.

  Further, in the slots 31 (for example, No. 1, No. 25, No. 49, etc.) in which the coils U2, U4, U6 are accommodated, the coils U2, U4, U6 are accommodated while being sequentially changed along the radial direction. For example, no. In one slot, the number of turns is accommodated in the order of coils U2, U6, U4,. No. In the 25 slots, the coils U4, U2, U6. No. In the 49 slots, the coils U6, U4, U2.

  Also in this modification, the same effect as the above embodiment can be obtained. Further, by setting the number of parallel circuits to 6, the rotating electrical machine 10 can be further reduced in size, and the selection range of the number of turns of the stator winding 41 can be widened to further improve the design freedom.

(5-4. When q = 1, z = 3, n = 1, p = 12.)
In this modification, the number of pole slots per phase q = 1, the number of parallel circuits z = 3 for each phase, a constant n = 1 (1 ≦ n ≦ q because z ≦ p), and the number of pole pairs p = 12. This is the case. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 3 (z / q). The winding start positions of the three coils accommodated in one slot 31 are arranged every 120 ° (360 ° × (n / z)) in mechanical angle because z ≦ p. Therefore, the number of turns of each coil increases every 120 °, in other words, every time the stator core 32 is turned 1/3 (n / z) in the circumferential direction. In this modification, the rotary electric machine 10 has a slot combination of 24 poles and 72 slots.

  FIG. 10 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  The U-phase stator winding 41 includes three coils U1, U2, and U3 that constitute three parallel circuits Lu, respectively. The same applies to the V phase and the W phase.

  As shown in FIG. 10, the three coils U <b> 1, U <b> 2, U <b> 3 constituting the three U-phase parallel circuits Lu are all accommodated in a single slot 31. Further, the winding start positions of the three coils U1, U2, U3 accommodated in the same slot 31 are arranged at 120 ° intervals in the circumferential direction. Further, the layers of the three coils U1, U2, U3 accommodated in the same slot 31 are changed so that each coil overlaps in the radial direction at the winding start position of another coil and the winding start position of its own coil. . As a result, in the slot 31 (for example, No. 72, No. 24, No. 48, etc.) in which U1, U2, and U3 are accommodated, U1, U2, and U3 are accommodated while being sequentially changed along the radial direction. For example, no. In the 72 slots, the number of turns is accommodated in the order of coils U1, U3, U2. Also, for example, No. In the 24 slots, the number of turns is accommodated in the order of coils U2, U1, U3,. Also, for example, No. In the 48 slots, the number of turns is accommodated in the order of coils U3, U2, U1,.

  Also in this modification, the same effect as the above embodiment can be obtained.

(5-5. When q = 1, z = 2, n = 1, p = 8)
In this modification, the number of pole slots per phase q = 1, the number of parallel circuits z = 2 for each phase, the constant n = 1 (1 ≦ n ≦ q because z ≦ p), and the number of pole pairs p = 8 This is the case. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 2 (z / q). In addition, the winding start positions of the two coils accommodated in one slot 31 are arranged every 180 ° (360 ° × (n / z)) in mechanical angle because z ≦ p. Therefore, the number of turns of each coil increases every 180 °, in other words, every time the stator core 32 is made a half turn (n / z turn) in the circumferential direction. In this modification, the rotary electric machine 10 has a slot combination of 16 poles and 48 slots.

  FIG. 11 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  The U-phase stator winding 41 includes two coils U1 and U2 that constitute two parallel circuits Lu, respectively. The same applies to the V phase and the W phase.

  As shown in FIG. 11, the two coils U <b> 1 and U <b> 2 constituting the two U-phase parallel circuits Lu are all accommodated in a single slot 31. Further, the winding start positions of the two coils U1 and U2 accommodated in the same slot 31 are arranged at intervals of 180 ° in the circumferential direction. Further, the layers of the two coils U1 and U2 accommodated in the same slot 31 are changed so that each coil overlaps in the radial direction at the winding start position of another coil and the winding start position of its own coil. As a result, in slots 31 (for example, No. 48, No. 24, etc.) in which U1 and U2 are accommodated, U1 and U2 are alternately accommodated while being sequentially changed along the radial direction.

  Also in this modification, the same effect as the above embodiment can be obtained.

(5-6. When q = 1, z = 6, n = 1, p = 12.)
In this modification, the number of pole slots per phase q = 1, the number of parallel circuits of each phase z = 6, a constant n = 1 (1 ≦ n ≦ q because z ≦ p), and the number of pole pairs p = 12. This is the case. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is 6 (z / q). Further, the winding start positions of the six coils accommodated in one slot 31 are arranged every 60 ° (360 ° × (n / z)) in mechanical angle because z ≦ p. Therefore, the number of turns of each coil increases every 60 °, in other words, every time the stator core 32 is turned 1/6 (n / z) in the circumferential direction. In this modification, the rotary electric machine 10 has a slot combination of 24 poles and 72 slots.

  FIG. 12 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  The U-phase stator winding 41 includes six coils U1, U2, U3, U4, U5, and U6 that constitute six parallel circuits Lu, respectively. The same applies to the V phase and the W phase.

  As shown in FIG. 12, the six coils U1, U2, U3, U4, U5, and U6 that constitute the six U-phase parallel circuits Lu are all accommodated in a single slot 31. In addition, the winding start positions of the six coils U1, U2, U3, U4, U5, and U6 accommodated in the same slot 31 are arranged at 60 ° intervals in the circumferential direction. The six coils U1, U2, U3, U4, U5, and U6 accommodated in the same slot 31 are arranged such that each coil overlaps in the radial direction at the winding start position of another coil and the winding start position of its own coil. The layer is changed.

  As a result, in the slots 31 (for example, No. 72, No. 12, No. 24, No. 36, No. 48, No. 60, etc.) in which the coils U1, U2, U3, U4, U5, U6 are accommodated. The coils U1, U2, U3, U4, U5 and U6 are accommodated while being sequentially changed along the radial direction. For example, no. In the 72 slots, the coils U1, U6, U5, U4, U3, U2... No. In the 12 slots, the coils U2, U1, U6, U5, U4, U3. No. In the 24 slots, coils U3, U2, U1, U6, U5, U4. No. In the 36 slots, coils U4, U3, U2, U1, U6, U5. No. In the 48 slots, coils U5, U4, U3, U2, U1, U6. No. In the 60 slots, coils U6, U5, U4, U3, U2, U1.

  Also in this modification, the same effect as the above embodiment can be obtained. Further, by setting the number of parallel circuits to 6, the rotating electrical machine 10 can be further reduced in size, and the selection range of the number of turns of the stator winding 41 can be widened to further improve the design freedom.

(5-7. When q = 3, z = 6, n = 2, p = 4)
In this modification, the number of pole slots per phase q = 3, the number of parallel circuits of each phase z = 6, a constant n = 2 (because z> p, 1 ≦ n ≦ pq / z), and the number of pole pairs p = This is the case of 4. In this case, the number of coils constituting the in-phase parallel circuit accommodated in one slot 31 is six. Further, the winding start position of each of the six coils accommodated in one slot 31 is a set of three coils, and the two coils have a mechanical angle of 180 ° (360 ° × ( n / p)). Therefore, the number of turns of each coil increases every 180 °, in other words, every time the stator core 32 is made a half turn (n / p turn) in the circumferential direction. In this modification, the rotating electrical machine 10 has a slot combination of 8 poles and 72 slots.

  FIG. 13 shows an example of the arrangement configuration of the U-phase coil of this modification. Regarding the V phase and the W phase, since the arrangement configuration of the U phase coil is moved by an appropriate number of slots in the circumferential direction, the description is omitted.

  The U-phase stator winding 41 includes six coils U1, U2, U3, U4, U5, and U6 that constitute six parallel circuits Lu, respectively. The same applies to the V phase and the W phase.

  As shown in FIG. 13, six coils U1, U2, U3, U4, U5, and U6 that respectively constitute six U-phase parallel circuits Lu are arranged in three slots 31 that are continuously arranged in the circumferential direction. It is divided into two sets of U1, U2, U3 and coils U4, U5, U6, and is housed three by three. Further, the winding start positions of the six coils U1, U2, U3, U4, U5, and U6 accommodated in the same slot 31 are divided into two sets of coils U1, U2, and U3 and coils U4, U5, and U6. , Are arranged at intervals of 180 ° in the circumferential direction. The six coils U1, U2, U3, U4, U5, and U6 accommodated in the same slot 31 are arranged such that each coil overlaps in the radial direction at the winding start position of another coil and the winding start position of its own coil. The layer is changed.

  As a result, in the slot 31 (for example, No. 72, No. 1, No. 2, No. 36, No. 37, No. 38, etc.) in which the coils U1, U2, U3, U4, U5, U6 are accommodated. The coils U1, U2, U3, U4, U5 and U6 are alternately accommodated while being sequentially changed along the radial direction. For example, no. In the 72 slots, the coils U1, U6, U2, U4, U3, U5... Also, for example, No. In one slot, the number of turns is accommodated in the order of coils U2, U4, U3, U5, U1, U6. Also, for example, No. In the slot 2, the number of turns is accommodated in the order of the coils U3, U5, U1, U6, U2, U4. For example, no. In the 36 slots, the coils U4, U3, U5, U1, U6, U2... Also, for example, No. In the slot of 37, the number of turns is accommodated in the order of coils U5, U1, U6, U2, U4, U3. Also, for example, No. In the 38 slots, the coils U6, U2, U4, U3, U5, U1,...

  Also in this modification, the same effect as the above embodiment can be obtained. Further, by setting the number of parallel circuits to 6, the rotating electrical machine 10 can be further reduced in size, and the selection range of the number of turns of the stator winding 41 can be widened to further improve the design freedom.

  In addition to the above, the methods according to the above embodiments may be used in appropriate combination. In addition, although not illustrated one by one, each above-mentioned embodiment is implemented by adding various changes without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 10 Rotating electric machine 20 Rotor 31 Slot 32 Stator iron core 41 Stator winding Lu Parallel circuit Lv Parallel circuit Lw Parallel circuit U1-U4 coil V1-V4 coil W1-W4 coil

Claims (7)

A three-phase stator winding configured to have a wave winding system in which a plurality of coils are connected in parallel so as to have two or more parallel circuits in each phase;
A rotating electrical machine comprising: a stator core having a plurality of slots each housing two or more coils constituting the parallel circuit of the same phase. The stator winding is
The winding start positions of the two or more coils constituting the parallel circuit of the same phase housed in one of the slots are arranged at equal intervals in the circumferential direction of the stator core. The rotating electrical machine according to claim 1. The stator winding is
Of the two or more coils constituting the parallel circuit of the same phase housed in the one slot, the coil constituting one of the parallel circuits constitutes the winding start of the coil constituting the other parallel circuit The rotating electrical machine according to claim 2, wherein the rotating electric machine is configured such that the layer is changed so as to overlap the coil and the stator core in a radial direction at a position. A rotor having a plurality of magnetic poles;
The stator winding is
Two or more coils constituting the parallel circuit of the same phase are respectively accommodated in two or more slots arranged continuously in the circumferential direction of the stator core corresponding to each magnetic pole of the rotor. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is configured as described above. The stator winding is
The two or more coils constituting the parallel circuit of the same phase are configured to be accommodated in the respective slots while being sequentially changed along the radial direction of the stator core. The rotating electrical machine according to any one of the above. The stator winding is
The plurality of coils are configured to be connected in parallel so as to have four parallel circuits in U phase, V phase, and W phase, respectively.
In each phase, two of the four coils constituting the parallel circuit of the same phase are accommodated in two slots arranged continuously in the circumferential direction of the stator core corresponding to each magnetic pole of the rotor. ,
Winding start positions of the two coils constituting the parallel circuit of the same phase housed in one of the slots are arranged at intervals of 180 ° in the circumferential direction of the stator core;
Of the two coils constituting the parallel circuit of the same phase housed in the one slot, the coil constituting one of the parallel circuits is the winding start position of the coil constituting the other parallel circuit 6. The rotating electrical machine according to claim 1, wherein the layer is changed so as to overlap in a radial direction of the coil and the stator core. A stator winding mounted on a stator core of a rotating electrical machine,
A plurality of coils are connected in parallel so as to have two or more parallel circuits in each phase to form a wave winding system, and the two or more coils constituting the parallel circuit of the same phase are formed of the stator core. A stator winding characterized by being configured to be accommodated in each slot.

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