Rotating electric machine

Abstract

To provide a rotary electric machine in which insulating retention of copper wires is high and wiring work can be easily performed during manufacturing.SOLUTION: A rotary electric machine includes:a stator having a plurality of iron cores arranged along a circumferential direction and wirings wound around each of the plurality of iron cores; and a rotor having permanent magnets arranged so as to have different magnetism in the circumferential direction. The winding includes a first-phase winding, a second-phase winding, and a third-phase winding, which are respectively connected in series with crossover wires, and are connected in a delta connection, the winding direction of the first-phase winding and the third-phase winding is a first winding direction, the winding direction of the second-phase winding is a second winding direction opposite to the first winding direction, the crossover wire for connecting the first-phase winding and the crossover wire for connecting the third-phase wiring are arranged on a first side surface of the stator, and the crossover wire for connecting the second-phase wiring is arranged on a second surface opposite to the first side surface.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a rotating electric machine, and more particularly to a three-phase rotating electric machine adopting a delta connection as a connection method.

Background Art

[0002] Conventionally, a three-phase rotating electric machine includes a rotor having permanent magnets arranged so as to have alternately different magnetic polarities of S and N in the circumferential direction and a corresponding stator, and a plurality of iron cores arranged along the circumferential direction on the stator are wound with three-phase coils to be configured.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is known that there are two connection methods for three-phase coils, namely star connection and delta connection. Consider the wiring of the stator coils in the delta connection method.

[0005] In the stator of the delta connection method used in a conventional three-phase rotating electric machine, as shown in FIG. 6, for the iron cores arranged along the circumference, three-phase coils are wound in the order shown in FIG. 7. The coils A, B, and C of each phase are each connected in series with a plurality of coils by jumper wires. First, the coil A of the U phase is wound in the order of A1 - A2 - A3 - A4 - A5 - A6, then the coil B of the V phase is wound in the order of B1 - B2 - B3 - B4 - B5 - B6, and the coil C of the W phase is wound in the order of C1 - C2 - C3 - C4 - C5 - C6. In the order shown in FIG. 7, the coils of all phases are wound in the same direction. The terminal processing at this time is that A1 and C6 are connected at the contact point X, A6 and B1 are connected at the contact point Y, and B6 and C1 are connected at the contact point Z.

[0006] However, if all coils are wound in the same direction, contact X will be close to A1 and C6, but contact Y will be physically separated from A6 and B1, and contact Z from B6 and C1. This makes assembly difficult and is also disadvantageous for maintaining insulation. For example, the separation of contacts can cause the wiring to lift, requiring adhesive impregnation, and it also makes it easy to make mistakes in wiring.

[0007] Figure 8 shows the external appearance of a conventional delta-connected stator with coils wound around it. Figure 8(b) is a magnified view of the external appearance from one side. In a conventional delta-connected stator, as shown in Figure 8, the jumper wires connecting each coil are routed on the same plane. Because the jumper wires are arranged on the same plane, the thickness increases due to the overlapping of wiring where three jumper wires are densely packed. This increase in thickness is not in line with the recent demand for miniaturization of devices. For example, if the stator in Figure 8 is configured as a device with thickness limitations, careful wiring work is required during manufacturing in areas where the jumper wires are densely packed, making the wiring work difficult.

[0008] Patent Document 1 proposes a wiring method in which, unlike conventional wiring methods, only one of the three-phase coils is wound in the opposite direction. However, the method described in this document has the following problems because the jumper wires are still routed on the same plane.

[0009] Figure 9 shows (a) the configuration of jumper wires in a conventional delta-connected stator and (b) the configuration of jumper wires in Patent Document 1. In the conventional configuration, as shown in Figure 9(a), the winding direction of all phases was the same, so the jumper wires were wired similarly in all cores. However, in the configuration of Patent Document 1, as shown in Figure 9(b), the winding direction of only one of the three phase coils is reversed, so the jumper wires of the reverse-wound coil become diagonal.

[0010] In the configuration of Patent Document 1, firstly, the diagonally positioned jumper wires interfere with the winding work of winding coils around adjacent iron cores. Winding work must be performed for each phase, but in the configuration of Patent Document 1, the second phase to be wound is wound in the opposite direction, so the diagonally positioned jumper wires interfere with the winding work of winding the coil of the last phase to be wound.

[0011] Furthermore, in the configuration of Patent Document 1, as shown in Figure 9(b), the angled jumper wire comes into contact with the jumper wire of the other phase. Because the angled jumper wire is pulled to the opposite side while in contact with the jumper wire of the other phase, friction occurs due to the tension applied to the contact point, which may cause damage to the enamel coating of the copper wire. If the coating of the copper wire is damaged, it may become impossible to maintain insulation. In this case, a short circuit may occur at the contact point.

[0012] Therefore, the present invention has been made in view of the above problems, and aims to provide a rotating electric machine that has high insulation retention properties for copper wires and allows for easy wiring work during manufacturing. [Means for solving the problem]

[0013] [1] In order to solve the above problems, the rotating electric machine according to the present invention comprises a stator having a plurality of iron cores arranged along the circumferential direction and windings wound around each of the plurality of iron cores, and a rotor having permanent magnets arranged to have different magnetic properties in the circumferential direction, wherein the windings are connected in a delta connection to a first phase winding, a second phase winding, and a third phase winding, each connected in series by a jumper wire, the winding direction of the first phase winding and the third phase winding is the first winding direction, the winding direction of the second phase winding is the second winding direction opposite to the first winding direction, the jumper wires connecting the first phase winding and the jumper wires connecting the third phase winding are arranged on the first side surface of the stator, and the jumper wires connecting the second phase winding are arranged on the second side surface opposite to the first side surface.

[0014] According to this embodiment, it is possible to provide a rotating electric machine that has high insulation retention properties for copper wires and allows for easy wiring work during manufacturing.

[0015] [2] In the rotating electric machine described in [1] above, the first end of the first phase winding connected in series is connected to the second end of the third phase winding connected in series, the second end of the second phase winding connected in series is connected to the second end of the first phase winding connected in series, and the first end of the third phase winding connected in series is connected to the first end of the second phase winding connected in series.

[0016] According to this embodiment, even if the winding direction is reversed, it can be treated electrically as the same rotating electric machine as in the conventional model.

[0017] [3] In the rotating electric machine described in [2] above, the first side surface may have a connection area between the contacts to which the two ends of the first phase winding, the two ends of the second phase winding, and the two ends of the third phase winding are connected and the lead wires to the outside.

[0018] According to this embodiment, the amount of conductors used when crossing to adjacent iron cores and when heading towards connection points can be reduced.

[0019] [4] In the rotating electric machine described in any of [1] to [3] above, the rotating electric machine may be configured as a generator in which an electromotive force is generated in the winding as the rotor rotates.

[0020] According to this embodiment, a generator can be provided that has high insulation retention of copper wire and allows for easy wiring work during manufacturing.

[0021] 〔5〕In order to solve the above problems, the stator according to the present invention is a stator having a plurality of iron cores arranged along the circumferential direction and windings wound around each of the plurality of iron cores, wherein the windings are delta-connected such that the windings of the first phase, the windings of the second phase, and the windings of the third phase, which are respectively connected in series by jumper wires, are connected. The winding directions of the windings of the first phase and the second phase are the first winding direction, the winding direction of the windings of the third phase is the second winding direction opposite to the first winding direction, the jumper wires connecting the windings of the first phase are arranged on the first side surface of the stator, and the jumper wires connecting the windings of the third phase are arranged on the second surface opposite to the first side surface.

[0022] According to this aspect, it is possible to provide a stator that can be used in a rotating electric machine with high insulation retention of copper wires and easy wiring work during manufacturing.

Brief Description of the Drawings

[0023] [Figure 1] It is a diagram showing a schematic configuration of a generator according to this embodiment. [Figure 2] It is a diagram showing a stator before winding coils. [Figure 3] It is a diagram showing the configuration of coils wound around a stator. [Figure 4] S It is a diagram showing an example of the arrangement of jumper wires of coils in the stator according to this embodiment. [Figure 5] It is a diagram showing the winding structure of coils in the stator of the generator according to this embodiment. [Figure 6] It is a diagram showing a stator before winding coils in a conventional stator. [Figure 7] It is a diagram showing the configuration of coils wound around a stator in a conventional stator. [Figure 8] It is a diagram showing the jumper wires of coils in a stator used in a conventional generator. <## [Figure 9]This diagram shows the winding structure of a stator used in conventional generators. [Modes for carrying out the invention]

[0024] Hereinafter, specific examples of embodiments of the present invention will be described with reference to the figures. In the following description, common components in each embodiment will be denoted by the same reference numerals, and repeated descriptions will be omitted. In the following embodiments, a generator will be given as an example of a rotating electric machine.

[0025] Figure 1 is a diagram showing the schematic configuration of a generator according to this embodiment. In Figure 1, (a) is a diagram showing the generator as seen from the front, and (b) is a diagram showing a cross-section of the generator in (a).

[0026] As shown in Figure 1, the generator 1 comprises a rotor 10 and a stator 20 arranged coaxially. The generator 1 in this embodiment is an outer rotor type generator, and the rotor 10 is configured to surround the stator 20 at its ends.

[0027] The rotor 10 comprises a rotor body 11, a magnet 12, and a magnet case 13. The rotor body 11 is configured so that the rotor 10 can rotate around a rotation axis R into which a rotating body such as a crankshaft is inserted. That is, when the crankshaft rotates, the rotor 10 can rotate in conjunction with it around the rotation axis R. The rotor body 11 is further provided with cooling holes h1.

[0028] The magnets 12 are held in the magnet case 13 and arranged circumferentially at the end of the rotor body 11. The magnets 12 are permanent magnets arranged so that they have different magnetic properties in the circumferential direction. For example, the magnets 12 are arranged circumferentially before magnetization, and then magnetized so that north poles and south poles are alternately arranged at regular intervals.

[0029] The stator 20 comprises a stator body 21, an iron core 22, and a coil (winding) 23. The coil 23 can be made of a conductive material covered with an insulating coating. The iron core 22 is provided to protrude from the outer circumference of the stator body 21, and the coil 23 is wound around the iron core 22. The stator body 21 is provided with holes h2 into which fixing screws or the like for fixing the generator 1 are inserted.

[0030] In the generator 1, the magnet 12 of the rotor 10 and the iron core 22 around which the coil 23 of the stator 20 is wound are configured to face each other. In the generator 1 with this configuration, when the rotor 10 is rotated around the rotation axis R by a rotating body such as a crankshaft, the magnet 12, which is magnetized alternately to the north and south poles in the circumferential direction, rotates. As a result of the rotation of the rotor 10, the magnetic field formed between the magnet 12 and the iron core 22 of the stator 20 changes, and electricity can be generated by the electromotive force generated in the coil 23 wound around the iron core 22 by electromagnetic induction, which causes an induced current to flow.

[0031] In the generator according to this embodiment, the configuration of the coils wound around the stator provides high insulation retention for the copper wires and facilitates wiring work during manufacturing. The configuration of the coils wound around the stator will be further explained.

[0032] In the generator according to this embodiment, the stator 20 has three-phase coils 23 wound around an iron core 22 in a delta connection. In this embodiment, for illustrative purposes, a stator with 18 poles in three phases will be used as an example, but the number of poles is not particularly limited.

[0033] Figure 2 shows the stator before winding the coils of this embodiment. Figure 3 shows the configuration of the coils wound in the stator of this embodiment.

[0034] Figure 2 shows the 18-pole iron cores 22_1, 22_2, 22_3, 22_4, 22_5, 22_6, 22_7, 22_8, 22_9, 22_10, 22_11, 22_12, 22_13, 22_14, 22_15, 22_16, 22_17, and 22_18. Note that when the individual iron cores 22_1 to 22_18 are not distinguished, they may simply be referred to as "iron core 22".

[0035] Figure 3 shows coils 23_1(U1), 23_2(U2), 23_3(U3), 23_4(U4), 23_5(U5), and 23_6(U6) connected in series by jumper wire 24a, coils 23_7(V1), 23_8(V2), 23_9(V3), 23_10(V4), 23_11(V5), and 23_12(V6) connected in series by jumper wire 24b, and coils 23_13(W1), 23_14(W2), 23_15(W3), 23_16(W4), 23_17(W5), and 23_18(W6) connected in series by jumper wire 24c. Note that when coils 23_1 to 23_18 are not distinguished, they may simply be referred to as "coil 23". Similarly, when crossovers 24a, 24b, and 24c are not distinguished, they may simply be referred to as "crossover 24".

[0036] In the coil configuration shown in Figure 3, coils 23_1 (U1), 23_2 (U2), 23_3 (U3), 23_4 (U4), 23_5 (U5), and 23_6 (U6) are coils 23U wound around the U phase (first phase), coils 23_7 (V1), 23_8 (V2), 23_9 (V3), 23_10 (V4), 23_11 (V5), and 23_12 (V6) are coils 23V wound around the V phase (second phase), and coils 23_13 (W1), 23_14 (W2), 23_15 (W3), 23_16 (W4), 23_17 (W5), and 23_18 (W6) are coils 23W wound around the W phase (third phase). Note that U1-U6, V1-V6, and W-W6 in 23U, 23V, and 23W are used for convenience to identify each phase.

[0037] In the configuration shown in Figures 2 and 3, there are 18 poles for the 18 iron cores 22_1(U1), 22_2(V1), 22_3(W1), 22_4(U2), 22_5(V2), 22_6(W2), 22_7(U3), 22_8(V3), 22_9(W3), 22_10(U4), 22_11(V4), 22_12(W4), 22_13(U5), 22_14(V5), 22_15(W5), 22_16(U6), 22_17(V6), and 22_18(W6). Coils 23_1(U1), 23_2(U2), 23_3(U3), 23_4(U4), 23_5(U5), 23_6(U6), 23_7(V1), 23_8(V2), 23_9(V3), 23_10(V4), 23_11(V5), 23_12(V6), coils 23_13(W1), 23_14(W2), 23_15(W3), 23_16(W4), 23_17(W5), and 23_18(W6) can be wound around their respective positions.

[0038] Specifically, for the U phase, coil 23_1(U1) is wound around core 22_1(U1), coil 23_2(U2) is wound around core 22_4(U2), coil 23_3(U3) is wound around core 22_7(U3), coil 23_4(U4) is wound around core 22_10(U4), coil 23_5(U5) is wound around core 22_13(U5), and coil 23_6(U6) is wound around core 22_16(U6).

[0039] For the V phase, coil 23_7(V1) is wound around core 22_2(V1), coil 23_8(V2) is wound around core 22_5(V2), coil 23_9(V3) is wound around core 22_8(V3), coil 23_10(V4) is wound around core 22_11(V4), coil 23_11(V5) is wound around core 22_14(V5), and coil 23_12(V6) is wound around core 22_17(V6).

[0040] For the W phase, coil 23_13(W1) is wound around core 22_3(W1), coil 23_14(W2) is wound around core 22_6(W2), coil 23_15(W3) is wound around core 22_9(W3), coil 23_16(W4) is wound around core 22_12(W4), coil 23_17(W5) is wound around core 22_15(W5), and coil 23_18(W6) is wound around core 22_18(W6).

[0041] Thus, the winding positions of the U-phase, V-phase, and W-phase coils 23 around the iron core 22 differ only in the middle phase, the V-phase. With this configuration, even if the winding direction of the middle phase, the V-phase coil, is reversed, the electrical properties at the ends of the U-phase, V-phase, and W-phase coils 23U, 23V, and 23W will be the same as those of the conventional stator 20 shown in Figures 6 and 7.

[0042] In the coil configuration shown in Figure 3, the U-phase (first phase) coil 23U and the W-phase (third phase) coil 23W are wound in the same winding direction, while only the V-phase (second phase) coil 23V is wound in the opposite winding direction. Furthermore, the three phase coils 23U, 23V, and 23W are connected by a delta connection. Specifically, the end U1 (first end) of coil 23U wound around the U phase (first phase) and the end W6 (second end) of coil 23W wound around the W phase (third phase) are connected at contact X, the end V6 (second end) of coil 23V wound around the V phase (second phase) and the end U6 (second end) of coil 23U wound around the U phase (first phase) are connected at contact Y, and the end W1 (first end) of coil 23W wound around the W phase and the end V1 (first end) of coil 23V wound around the V phase are connected at contact Z.

[0043] In the stator 20 of this embodiment, only the V-phase coil 23V, which is the middle phase of the three phases, is wound in the opposite winding direction, so the V-phase coil 23V is arranged in the opposite direction to the contacts. That is, the U-phase coil 23U and the V-phase coil 23V are connected at the end of coil 23_6 (U6) (second end) and the end of coil 23_12 (V6) (second end), and the V-phase coil 23V and the W-phase coil 23W are connected at the end of coil 23_7 (V1) (first end) and the end of coil 23_13 (W1) (first end). Furthermore, the W-phase coil 23W and the U-phase coil 23U are connected at the end of coil 23_18 (W6) (second end) and the end of coil 23_1 (U1) (first end).

[0044] Thus, because only the V-phase coil 23V is wound in the opposite winding direction, the ends of the coils wound around adjacent cores are connected at each contact X, Y, and Z. Specifically, at contact X, the ends of the coils wound around adjacent cores W6 and U1 are connected; at contact Y, the ends of the coils wound around adjacent cores U6 and V6 are connected; and at contact Z, the ends of the coils wound around adjacent cores V1 and W1 are connected. This configuration brings the ends of the connected coils into physical proximity, making assembly easier and also advantageous for maintaining insulation.

[0045] Furthermore, in the stator 20 of this embodiment, the jumper wires 24a and 24c for the U-phase and W-phase coils 23U and 23W are arranged on the same plane, while only the jumper wire 24b for the V-phase coil 23V is arranged on the opposite plane.

[0046] Figure 4 shows an example of the arrangement of coil jumper wires in a stator according to this embodiment.

[0047] Figure 4 shows the connecting wires 24a for the U-phase coils 23_1 (U1) and 23_2 (U2), the connecting wires 24b for the V-phase coils 23_7 (V1) and 23_8 (V2), and the connecting wires 24c for the W-phase coils 23_13 (W1) and 23_14 (W2). In the stator 20 according to this embodiment, as shown in Figure 4, the connecting wires 24a for the U-phase coil 23U and the connecting wires 24c for the W-phase coil 23W are arranged on the A-side, while only the connecting wire 24b for the V-phase coil 23V is arranged on the B-side, which is opposite to the A-side. With this configuration, even if only the V-phase coil 23V is wound in the opposite direction to the other phase coils 23U and 23W, diagonal connecting wires are not formed. Therefore, the jumper wire 24 is less likely to interfere with the winding work of the coil 23 of the other phase, and damage to the insulating coating at the point of contact between the coil 23 of the other phase and the jumper wire 24 is less likely to occur.

[0048] Furthermore, in the generator according to this embodiment, instead of separately preparing three 3-phase coils 23 to be wound around the stator and then winding the coils 23 around the iron core 22 and connecting them at contacts X, Y, and Z, a 3-phase coil 23 that is pre-connected at contacts X, Y, and Z may be wound around the iron core 22.

[0049] In this case, the U-phase coil 23U can be wound first in the order U1-U2-U3-U4-U5-U6, then the V-phase coil 23V can be wound in the order V6-V5-V4-V3-V2-V1, and the W-phase coil 23W can be wound in the order W1-W2-W3-W4-W5-W6. Winding the coils 23 in this order makes the winding work easier. For example, a needle-type winding machine can be used for the winding work.

[0050] Figure 5 shows the winding structure in the stator of the generator according to this embodiment. In Figure 5, (a) shows the external appearance of the stator around which the coils are wound, (b) is an enlarged view of a part of the external appearance on surface A, and (c) is an enlarged view of a part of the external appearance on surface B.

[0051] As shown in Figure 5, in the stator 20 of the generator according to this embodiment, the jumper wires 24a for the U-phase coil 23U and 24c for the W-phase coil 23W are arranged on side A, while the jumper wires 24b for the V-phase coil 23V are arranged on side B. Therefore, the overlap of the jumper wires 24 is at most two, eliminating the need to push the wires in or impregnate them with adhesive in manufacturing processes where thickness is a constraint, thus simplifying the winding process.

[0052] Furthermore, in the embodiment shown in Figure 5(a), the connection area between the contacts X, Y, and Z, to which the two ends of the U-phase coil 23U, the two ends of the V-phase coil 23V, and the two ends of the W-phase coil 23W are connected, is on surface A. By arranging the connection area between the contacts X, Y, and Z and the external lead wires on surface A, which is the surface where the two jumper wires 24a and 24c are located, the amount of conductors used when crossing to adjacent cores and when heading towards connection points can be reduced. However, this configuration is not essential, and the connection area may be located on surface B. (Extension of the embodiment) Although the present inventors have described the invention in detail based on embodiments, it goes without saying that the present invention is not limited thereto and can be modified in various ways without departing from its essence.

[0053] In the embodiments described above, a generator was used as an example of a rotating electric machine, but it is not limited to this, and other rotating electric machines such as motors may also be used. When configured as a motor, by passing an electric current through the coil 23, the iron core 22 is magnetized by electromagnetic induction, and the rotor 10 rotates as it repels or attracts the magnet 12.

[0054] In the embodiments described above, the first phase of the winding is the U phase, the second phase is the V phase, and the third phase is the W phase were used as examples, but the invention is not limited to these cases. Furthermore, the order in which the windings are wound is not limited to the order of the first phase, the second phase, and the third phase. [Explanation of Symbols]

[0055] 1...Generator, 10...Rotor, 11...Rotor body, 12...Magnet, 13...Magnet case, 20...Stator, 21...Stator body, 22 (22_1, 22_2, 22_3, 22_4, 22_5, 22_6, 22_7, 22_8, 22_9, 22_10, 22_11, 22_12, 22_13, 22_14, 22_15, 22_16, 22_17, 22_18)... Iron core, 23 (23_1 (U1), 23_2 (U2), 23_3 (U3), 23_4 (U4), 23_5 (U5), 23_6 (U6), 23_7 (V1), 23_8 (V2), 23_9 (V3), 23_10 (V4), 23_11 (V5), 23_12 (V6), coil 23_13 (W1), 23_14 (W2), 23_15 (W3), 23_16 (W4), 23_17 (W5), 23_18 (W6))... Coil (winding), h1, h2... Hole, 24 (24a, 24b, 24c)... Jumper wire

Claims

1. A stator having a plurality of iron cores arranged along the circumferential direction and windings wound around each of the plurality of iron cores, A rotating electric machine comprising a rotor having permanent magnets arranged to have different magnetic properties in the circumferential direction, The windings are connected in a delta configuration, with a first phase winding, a second phase winding, and a third phase winding connected in series by jumper wires, the winding direction of the first phase winding and the third phase winding being the first winding direction, the winding direction of the second phase winding being the second winding direction opposite to the first winding direction, the jumper wires connecting the first phase winding and the jumper wires connecting the third phase winding are located on a first side surface which is one end face in the axial direction of the stator, and the jumper wires connecting the second phase winding are located on a second side surface opposite to the first side surface. The first phase winding, the second phase winding, and the third phase winding each have a first end and a second end, The first end of the series-connected first phase winding and the second end of the series-connected third phase winding are connected at a first contact. The second end of the series-connected second phase winding and the second end of the series-connected first phase winding are connected by a second contact. The first end of the third phase winding connected in series and the first end of the second phase winding connected in series are connected at a third contact. The first contact, the second contact, and the third contact are arranged on the first side surface of the stator. The connection area between the first contact, the second contact, the third contact, and the lead wire to the outside is located on either the first side or the second side within the area of ​​two adjacent cores among the plurality of cores arranged along the circumferential direction. Rotating electric machine.

2. A rotating electric machine according to claim 1, The first end of the series-connected first phase winding and the second end of the series-connected third phase winding are connected. The second end of the series-connected second phase winding and the second end of the series-connected first phase winding are connected. The first end of the third phase winding connected in series and the first end of the second phase winding connected in series are connected. Rotating electric machine.

3. A rotating electric machine according to claim 2, The first side surface has a connection area between the contacts to which the two ends of the first phase winding, the two ends of the second phase winding, and the two ends of the third phase winding are connected, and the lead wires to the outside. Rotating electric machine.

4. A rotating electric machine according to any one of claims 1 to 3, The aforementioned rotating electric machine is configured as a generator in which an electromotive force is generated in the windings by the rotation of the rotor. Rotating electric machine.

5. A stator having a plurality of iron cores arranged along the circumferential direction and windings wound around each of the plurality of iron cores, The windings are connected in a delta configuration, with a first phase winding, a second phase winding, and a third phase winding connected in series by jumper wires, the winding direction of the first phase winding and the third phase winding being the first winding direction, the winding direction of the second phase winding being the second winding direction opposite to the first winding direction, the jumper wires connecting the first phase winding and the jumper wires connecting the third phase winding are located on a first side surface which is one end face in the axial direction of the stator, and the jumper wires connecting the second phase winding are located on a second side surface opposite to the first side surface. The first phase winding, the second phase winding, and the third phase winding each have a first end and a second end, The first end of the series-connected first phase winding and the second end of the series-connected third phase winding are connected at a first contact. The second end of the series-connected second phase winding and the second end of the series-connected first phase winding are connected by a second contact. The first end of the third phase winding connected in series and the first end of the second phase winding connected in series are connected at a third contact. The first contact, the second contact, and the third contact are arranged on the first side surface of the stator. The connection area between the first contact, the second contact, the third contact, and the lead wire to the outside is located on either the first side or the second side within the area of ​​two adjacent cores among the plurality of cores arranged along the circumferential direction. stata.

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