WO2021024606A1 - Stator and motor - Google Patents

Abstract

This stator includes a stator core (13) having a plurality of teeth (16) that are provided in a circumferential direction, and coils (U1 to U6, V1 to V6, W1 to W6, U11 to U14, V11 to V14, and W11 to W14) which are wound in a concentrated manner onto each of the plurality of teeth. Each coil comprises an electric wire having an insulating coating (14a) on the surface thereof. The stator generates a rotating magnetic field on the basis of the supply of a three-phase alternating current to the coils. No insulation member other than the insulating coating is interposed between coils that are adjacent to one another in the circumferential direction and that are in phase with one another. An insulating member (50) that is separate from the insulating coating is interposed between coils that are adjacent to one another in the circumferential direction and that are out of phase with one another.

Description

Stator and motor Cross-reference of related applications

This application is based on Japanese Application No. 2019-143040 filed on August 2, 2019, and the contents of the description are incorporated herein by reference.

This disclosure relates to a stator and a motor.

For example, in the stator of Patent Document 1, coils are centrally wound around each tooth of the stator core, and an insulating member different from the insulating coating of the electric wire of the coil is interposed between the coils adjacent to each other in the circumferential direction. There is.

Japanese Patent No. 5293436

In the stator of Patent Document 1, since an insulating member is provided between each coil, there is a problem that the number of parts constituting the stator increases. This problem becomes more remarkable in the case of a configuration in which the number of coils of the stator is increased, because the number of insulating members is also increased accordingly.

An object of the present disclosure is to provide a stator and a motor capable of reducing the number of parts.

In the first aspect of the present disclosure, the stator includes a stator core having a plurality of teeth provided in the circumferential direction and a coil centrally wound around the plurality of teeth, and each of the coils is insulated from the surface. A stator composed of an electric wire having a coating film and generating a rotating magnetic field based on the supply of a three-phase alternating current to the coil, and between the coils that are adjacent to each other in the circumferential direction and are in phase with each other. An insulating member other than the insulating coating is not interposed, and an insulating member different from the insulating coating is interposed between the coils which are adjacent to each other in the circumferential direction and are out of phase with each other.

In a second aspect of the present disclosure, the motor comprises an annular stator and a rotor provided inside the stator, wherein the stator comprises a stator core having a plurality of teeth provided in the circumferential direction and said. Each of the coils comprises a coil that is centrally wound around a plurality of teeth, and each of the coils is composed of an electric wire having an insulating coating on the surface, and a rotating magnetic field generated in the stator based on the supply of a three-phase AC current to the coil. A motor that rotates the rotor in the circumferential direction, and the coils that are adjacent to each other in the circumferential direction and are in phase with each other are adjacent to each other in the circumferential direction without any insulating member other than the insulating coating. In addition, an insulating member different from the insulating coating is interposed between the coils having different phases from each other.

According to the above-mentioned stator and motor, the insulating member is arranged only between the coils having different phases in which the potential difference tends to be large among the coils adjacent to each other in the circumferential direction. As a result, it is possible to suppress the occurrence of dielectric breakdown in the insulating coating of the electric wire of the coil while suppressing the number of insulating members provided between the coils. As a result, it is possible to contribute to reducing the number of parts of the stator and, by extension, reducing the manufacturing cost.

The above objectives and other objectives, features and advantages of the present disclosure will be clarified by the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is a schematic configuration diagram of the motor of the embodiment. FIG. 2 is an explanatory diagram for explaining the electrical configuration of the motor of the same embodiment. FIG. 3 is a schematic configuration diagram of the motor of the modified example. FIG. 4 is a schematic configuration diagram of the motor of the modified example. FIG. 5 is an explanatory diagram for explaining the electrical configuration of the motor of the modified example.

Hereinafter, an embodiment of the stator and the motor will be described.

As shown in FIG. 1, the motor 10 of the present embodiment includes an annular stator 11 and a rotor 12 rotatably provided inside the stator 11.

The stator 11 includes a stator core 13 and a stator winding 14 wound around the stator core 13. The stator core 13 is made of a magnetic material. In the present embodiment, the stator core 13 has a configuration in which a plurality of core sheets formed by press working from a metal plate are laminated in the axial direction.

The stator core 13 includes a substantially annular annular portion 15 in the axial direction and a plurality of teeth 16 extending radially inward from the annular portion 15. The plurality of teeth 16 are provided at equal angular intervals with each other in the circumferential direction. Further, the stator 11 of the present embodiment is composed of 18 teeth 16. That is, in the teeth 16, the number of slots which are the placement spaces of the stator windings 14 between the adjacent teeth is 18. The number of poles of the rotor 12 of this embodiment is 16 poles.

The stator winding 14 is composed of 18 coils, which will be described later, which are centrally wound around a plurality of teeth 16. Each coil is composed of an electric wire having an insulating coating 14a formed on its surface.

As shown in FIG. 2, the stator winding 14 is composed of a first three-phase coil 20 and a second three-phase coil 30. The first three-phase coil 20 and the second three-phase coil 30 are each composed of star connections.

The first three-phase coil 20 and the second three-phase coil 30 are connected to the inverter 40. The inverter 40 supplies three-phase alternating currents 120 degrees out of phase with each other to the first three-phase coil 20 and the second three-phase coil 30. Specifically, the inverter 40 outputs the U-phase current of the three-phase AC current from the U-phase output terminal 40u, outputs the V-phase current of the three-phase AC current from the V-phase output terminal 40v, and outputs the V-phase current of the three-phase AC current, and the W-phase output terminal 40w. Outputs the W-phase current of the three-phase AC current from.

The first three-phase coil 20 includes three U-phase coils U1, U2, U3, three V-phase coils V1, V2, V3, and three W-phase coils W1, W2, W3. The three U-phase coils include a first U-phase coil U1, a second U-phase coil U2, and a third U-phase coil U3. Further, the three V-phase coils include a first V-phase coil V1, a second V-phase coil V2, and a third V-phase coil V3. Further, the three W-phase coils include a first W-phase coil W1, a second W-phase coil W2, and a third W-phase coil W3.

The first U-phase coil U1, the second U-phase coil U2, and the third U-phase coil U3 are connected in series with each other. Specifically, one end of the first U-phase coil U1 is connected to the U-phase output terminal 40u of the inverter 40, and the other end of the first U-phase coil U1 is connected to one end of the second U-phase coil U2. One end of the third U-phase coil U3 is connected to the other end of the second U-phase coil U2, and the other end of the third U-phase coil U3 is connected to the neutral point 21. That is, the first U-phase coil U1, the second U-phase coil U2, and the third U-phase coil U3 are connected in series from the inverter 40 toward the neutral point 21 in this order.

Similarly, the first V-phase coil V1, the second V-phase coil V2, and the third V-phase coil V3 are connected in series with each other. Specifically, one end of the first V-phase coil V1 is connected to the V-phase output terminal 40v of the inverter 40, and the other end of the first V-phase coil V1 is connected to one end of the second V-phase coil V2. One end of the third V-phase coil V3 is connected to the other end of the second V-phase coil V2, and the other end of the third V-phase coil V3 is connected to the neutral point 21. That is, the first V-phase coil V1, the second V-phase coil V2, and the third V-phase coil V3 are connected in series from the inverter 40 toward the neutral point 21 in this order.

Similarly, the first W phase coil W1, the second W phase coil W2, and the third W phase coil W3 are connected in series with each other. Specifically, one end of the first W-phase coil W1 is connected to the W-phase output terminal 40w of the inverter 40, and the other end of the first W-phase coil W1 is connected to one end of the second W-phase coil W2. One end of the third W phase coil W3 is connected to the other end of the second W phase coil W2, and the other end of the third W phase coil W3 is connected to the neutral point 21. That is, the first W phase coil W1, the second W phase coil W2, and the third W phase coil W3 are connected in series from the inverter 40 toward the neutral point 21 in this order.

The second three-phase coil 30 has the same configuration as the first three-phase coil 20 described above.

That is, the second three-phase coil 30 includes fourth to sixth U-phase coils U4, U5, U6 corresponding to the first to third U-phase coils U1, U2, U3, respectively. The second three-phase coil 30 includes fourth to sixth V-phase coils V4, V5, and V6 corresponding to the first to third V-phase coils V1, V2, and V3, respectively. The second three-phase coil 30 includes fourth to sixth W phase coils W4, W5, and W6 corresponding to the first to third W phase coils W1, W2, and W3, respectively.

The 4th U-phase coil U4, the 5th U-phase coil U5, and the 6th U-phase coil U6 are connected in series with each other. Specifically, one end of the 4th U-phase coil U4 is connected to the U-phase output terminal 40u of the inverter 40, and the other end of the 4th U-phase coil U4 is connected to one end of the 5th U-phase coil U5. One end of the 6th U-phase coil U6 is connected to the other end of the 5th U-phase coil U5, and the other end of the 6th U-phase coil U6 is connected to the neutral point 31. That is, the 4th U-phase coil U4, the 5th U-phase coil U5, and the 6th U-phase coil U6 are connected in series from the inverter 40 toward the neutral point 31 in this order.

Similarly, the 4th V-phase coil V4, the 5th V-phase coil V5, and the 6th V-phase coil V6 are connected in series with each other. Specifically, one end of the 4th V-phase coil V4 is connected to the V-phase output terminal 40v of the inverter 40, and the other end of the 4th V-phase coil V4 is connected to one end of the 5th V-phase coil V5. One end of the 6th V-phase coil V6 is connected to the other end of the 5th V-phase coil V5, and the other end of the 6th V-phase coil V6 is connected to the neutral point 31. That is, the fourth V-phase coil V4, the fifth V-phase coil V5, and the sixth V-phase coil V6 are connected in series from the inverter 40 toward the neutral point 31 in this order.

Similarly, the 4th W phase coil W4, the 5th W phase coil W5, and the 6th W phase coil W6 are connected in series with each other. Specifically, one end of the 4th W phase coil W4 is connected to the W phase output terminal 40w of the inverter 40, and the other end of the 4th W phase coil W4 is connected to one end of the 5th W phase coil W5. One end of the 6th W phase coil W6 is connected to the other end of the 5th W phase coil W5, and the other end of the 6th W phase coil W6 is connected to the neutral point 31. That is, the 4th W phase coil W4, the 5th W phase coil W5, and the 6th W phase coil W6 are connected in series from the inverter 40 toward the neutral point 31 in this order.

Next, the arrangement of each of the above coils with respect to the plurality of teeth 16 of the stator core 13 will be described.

As shown in FIG. 1, the coil has a first U-phase coil U1, a second U-phase coil U2, and a third U-phase coil U3 in one of the circumferential directions (clockwise in FIG. 1) with respect to the 18 teeth 16. 3rd V-phase coil V3, 2nd V-phase coil V2, 1st V-phase coil V1, 4th W-phase coil W4, 5th W-phase coil W5, 6th W-phase coil W6, 6th U-phase coil U6, 5th U-phase coil U5, 4th U A phase coil U4, a fourth V phase coil V4, a fifth V phase coil V5, a sixth V phase coil V6, a third W phase coil W3, a second W phase coil W2, and a first W phase coil W1 are provided in this order.

That is, the first to third U-phase coils U1, U2, and U3 are wound around three teeth 16 that are continuously arranged in the circumferential direction. Further, the 4th to 6th U-phase coils U4, U5 and U6 are continuous in the circumferential direction at 180-degree facing positions of the three teeth 16 in which the 1st to 3rd U-phase coils U1, U2 and U3 are wound respectively. It is wound around three teeth 16 that are lined up in a row. Specifically, the first U-phase coil U1 and the sixth U-phase coil U6 are arranged at positions facing each other by 180 degrees. Further, the second U-phase coil U2 and the fifth U-phase coil U5 are arranged at positions facing each other by 180 degrees. The third U-phase coil U3 and the fourth U-phase coil U4 are arranged at positions facing each other by 180 degrees. The 1st U-phase coil U1, the 3rd U-phase coil U3, the 4th U-phase coil U4, and the 6th U-phase coil U6 are concentratedly wound in a forward winding manner, and the 2nd U-phase coil U2 and the 5th U-phase coil U5 are wound in a forward-winding manner. It is wound intensively in the opposite reverse winding.

The same applies to the V phase, and the first to third V phase coils V1, V2, and V3 are wound around three teeth 16 that are continuously arranged in the circumferential direction. The 4th to 6th V-phase coils V4, V5, and V6 are continuously located in the circumferential direction at 180-degree facing positions of the three teeth 16 in which the 1st to 3rd V-phase coils V1, V2, and V3 are wound. It is wound around three teeth 16 that are lined up. Specifically, the first V-phase coil V1 and the sixth V-phase coil V6 are arranged at positions facing each other by 180 degrees. Further, the second V-phase coil V2 and the fifth V-phase coil V5 are arranged at positions facing each other by 180 degrees. The third V-phase coil V3 and the fourth V-phase coil V4 are arranged at positions facing each other by 180 degrees. The 1st V-phase coil V1, the 3rd V-phase coil V3, the 4th V-phase coil V4, and the 6th V-phase coil V6 are concentratedly wound in a forward winding manner, and the 2nd V-phase coil V2 and the 5th V-phase coil V5 are wound in a forward-winding manner. It is wound intensively in the opposite reverse winding. Further, the third V-phase coil V3 is arranged next to the third U-phase coil U3. Further, the 4th V-phase coil V4 is arranged next to the 4th U-phase coil U4.

The same applies to the W phase, and the first to third W phase coils W1, W2, and W3 are wound around three teeth 16 that are continuously arranged in the circumferential direction. The fourth to sixth W-phase coils W4, W5, and W6 are continuously located in the circumferential direction at 180-degree facing positions of the three teeth 16 in which the first to third W-phase coils W1, W2, and W3 are wound, respectively. It is wound around three teeth 16 that are lined up. Specifically, the first W-phase coil W1 and the sixth W-phase coil W6 are arranged at positions facing each other by 180 degrees. Further, the second W phase coil W2 and the fifth W phase coil W5 are arranged at positions facing each other by 180 degrees. The third W-phase coil W3 and the fourth W-phase coil W4 are arranged at positions facing each other by 180 degrees. The 1st W phase coil W1, the 3rd W phase coil W3, the 4th W phase coil W4 and the 6th W phase coil W6 are wound in a forward winding manner, and the 2nd W phase coil W2 and the 5th W phase coil W5 are wound in a forward winding manner. It is wound intensively in the opposite reverse winding. Further, the first W phase coil W1 is arranged next to the first U phase coil U1. Further, the third W phase coil W3 is arranged next to the sixth V phase coil V6. Further, the 4th W phase coil W4 is arranged next to the 1st V phase coil V1. The 6th W phase coil W6 is arranged next to the 6th U phase coil U6.

Here, an insulating member 50 is interposed between the first U-phase coil U1 and the first W-phase coil W1 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the first V-phase coil V1 and the fourth W-phase coil W4 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the 4th U-phase coil U4 and the 4th V-phase coil V4 that are adjacent to each other in the circumferential direction.

Each insulating member 50 is made of a material (for example, a synthetic resin material) capable of electrically insulating the coils. Each insulating member 50 may be a sheet-shaped member inserted between the coils, or may be formed by filling the coil with an insulating material such as synthetic resin.

Further, in the present embodiment, the insulating member such as the insulating member 50 is not interposed between the coils other than the above three locations, and the coils at the locations where the insulating member is not interposed are circumferentially interposed through the gap. The coils are opposed to each other or the coils are in contact with each other. Specifically, as the places where the insulating member is not interposed, there are five coils between the first U-phase coil U1 to the first V-phase coil V1 and five coils from the fourth W-phase coil W4 to the fourth U-phase coil U4. Between, and between the five coils from the 4th V-phase coil V4 to the 1st W-phase coil W1.

The operation of this embodiment will be described.

By supplying the three-phase AC current from the inverter 40 to the first three-phase coil 20 and the second three-phase coil 30, each of the above-mentioned coils of the first three-phase coil 20 and the second three-phase coil 30 Is excited and the rotor 12 rotates.

At this time, in the first three-phase coil 20, the potential differences between the three-phase coils located closer to the inverter 40, that is, the first U-phase coil U1, the first V-phase coil V1, and the first W-phase coil W1 are large. On the other hand, the potential differences between the three-phase coils located closer to the neutral point 21, that is, the third U-phase coil U3, the third V-phase coil V3, and the third W-phase coil W3 are small.

Similarly, in the second three-phase coil 30, the potential differences between the three-phase coils located closer to the inverter 40, that is, the fourth U-phase coil U4, the fourth V-phase coil V4, and the fourth W-phase coil W4 are large. On the other hand, the potential differences between the three-phase coils located closer to the neutral point 31, that is, the sixth U-phase coil U6, the sixth V-phase coil V6, and the sixth W-phase coil W6 are small.

Further, in the first three-phase coil 20 and the second three-phase coil 30 connected in parallel to each other, the corresponding coils have substantially the same potential. That is, the 1st U phase coil U1 and the 4th U phase coil U4 have substantially the same potential, the 1st V phase coil V1 and the 4th V phase coil V4 have substantially the same potential, and the 1st W phase coil W1 and the 4th W phase coil. It has substantially the same potential as W4. Further, the 3rd U-phase coil U3 and the 6th U-phase coil U6 have substantially the same potential, the 3rd V-phase coil V3 and the 6th V-phase coil V6 have substantially the same potential, and the 3rd W-phase coil W3 and the 6th W-phase coil have substantially the same potential. It has substantially the same potential as W6.

Here, in the present embodiment, the coils having a large potential difference are arranged adjacent to each other in the circumferential direction. That is, the first U-phase coil U1 and the first W-phase coil W1 are adjacent to each other, the first V-phase coil V1 and the fourth W-phase coil W4 are adjacent to each other, and the fourth U-phase coil U4 and the fourth V-phase coil V4 are adjacent to each other.

Then, the insulating member 50 is interposed only between the coils having different phases adjacent to each other and having a large potential difference. That is, the insulating member 50 is arranged only between the coils having a large potential difference that may cause dielectric breakdown of the insulating coating of the electric wire. This makes it possible to minimize the number of insulating members 50.

The advantages of this embodiment will be described.

(1) By minimizing the number of insulating members 50 arranged between the coils, it is possible to contribute to the reduction of the number of parts and the manufacturing cost. Further, the number of turns of the coil not adjacent to the insulating member 50 can be increased, which can contribute to the improvement of the output.

(2) The first three-phase coil 20 is connected in series with the first to third U-phase coils U1 to U3 connected in series and the first to third V-phase coils V1 to V3 connected in series. The first to third W phase coils W1 to W3 are included. The first to third U phase coils U1 to U3, the first to third V phase coils V1 to V3, and the first to third W phase coils W1 to W3 are connected by a star connection. Similarly, the second three-phase coil 30 is connected in series with the fourth to sixth U-phase coils U4 to U6 connected in series and the fourth to sixth V-phase coils V4 to V6 connected in series. Also included are the 4th to 6th W phase coils W4 to W6. The 4th to 6th U-phase coils U4 to U6, the 4th to 6th V-phase coils V4 to V6, and the 4th to 6th W-phase coils W4 to W6 are connected by a star connection. According to this configuration, a potential difference is likely to occur between the coils having different phases, so that the effect of suppressing dielectric breakdown by the insulating member 50 can be remarkably obtained.

(3) Of the U-phase coils U1 to U6, the V-phase coils V1 to V6, and the W-phase coils W1 to W6, the coils farthest from the neutral points 21 and 31 in each phase are arranged next to each other, and the adjacent coils are arranged next to each other. Is an out-of-phase coil. Specifically, the combination of the adjacent different-phase coils is a combination of the first U-phase coil U1 and the first W-phase coil W1, a combination of the first V-phase coil V1 and the fourth W-phase coil W4, and a fourth U-phase coil U4. And the 4th V-phase coil V4. Since the potential difference is maximized in each combination of the coils having different phases, the dielectric breakdown of the insulating coating of the coils is effectively suppressed by interposing the insulating member 50 between the adjacent coils having different phases. be able to.

Further, among the U-phase coils U1 to U6, the V-phase coils V1 to V6, and the W-phase coils W1 to W6, the coils connected to the neutral points 21 and 31 of the star connection are arranged next to each other, and the adjacent coils are arranged next to each other. Is an out-of-phase coil. Specifically, the combination of the adjacent different-phase coils is a combination of the 3rd U-phase coil U3 and the 3rd V-phase coil V3, a combination of the 6th U-phase coil U6 and the 6th W-phase coil W6, and a 6th V-phase coil V6. And the third W phase coil W3. Then, an insulating member other than the insulating coating is not interposed between the adjacent coils having different phases. Since the potential difference is minimized in each combination of the coils having different phases, it is possible to eliminate the need for an insulating member between the adjacent coils having different phases, and as a result, the number of parts can be further reduced. It will be possible.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range. In the following description, the same reference numerals as those in the above embodiment indicate the same configuration, and the preceding description will be referred to.

The arrangement of each coil of the stator winding 14 and the insulating member 50 is not limited to the above embodiment, and can be changed as appropriate.

For example, the configuration shown in FIG. 1 may be changed to the configuration shown in FIG. In the configuration shown in the figure, the coil of the stator winding 14 has the first U-phase coil U1, the second U-phase coil U2, and the third U in the circumferential direction (clockwise direction in FIG. 3) with respect to the 18 teeth 16. Phase coil U3, 1st V phase coil V1, 2nd V phase coil V2, 3rd V phase coil V3, 1st W phase coil W1, 2nd W phase coil W2, 3rd W phase coil W3, 4th U phase coil U4, 5th U phase coil U5, 6th U phase coil U6, 4th V phase coil V4, 5th V phase coil V5, 6th V phase coil V6, 4th W phase coil W4, 5th W phase coil W5, 6th W phase coil W6 are provided in this order. ..

The star connection of the U-phase coils U1 to U6, the V-phase coils V1 to V6, and the W-phase coils W1 to W6 having the configuration shown in FIG. 3 is the same as that of the above embodiment. That is, the 1st U phase coil U1 and the 4th U phase coil U4 have substantially the same potential, the 1st V phase coil V1 and the 4th V phase coil V4 have substantially the same potential, and the 1st W phase coil W1 and the 4th W phase coil. It has substantially the same potential as W4. Further, the 3rd U-phase coil U3 and the 6th U-phase coil U6 have substantially the same potential, the 3rd V-phase coil V3 and the 6th V-phase coil V6 have substantially the same potential, and the 3rd W-phase coil W3 and the 6th W-phase coil have substantially the same potential. It has substantially the same potential as W6.

In the configuration shown in FIG. 3, the first to third U-phase coils U1, U2, and U3 are wound around three teeth 16 that are continuously arranged in the circumferential direction. Further, the 4th to 6th U-phase coils U4, U5 and U6 are continuous in the circumferential direction at 180-degree facing positions of the three teeth 16 in which the 1st to 3rd U-phase coils U1, U2 and U3 are wound respectively. It is wound around three teeth 16 that are lined up in a row. Specifically, the first U-phase coil U1 and the fourth U-phase coil U4 are arranged at positions facing each other by 180 degrees. Further, the second U-phase coil U2 and the fifth U-phase coil U5 are arranged at positions facing each other by 180 degrees. The third U-phase coil U3 and the sixth U-phase coil U6 are arranged at positions facing each other by 180 degrees.

The same applies to the V phase, and the first to third V phase coils V1, V2, and V3 are wound around three teeth 16 that are continuously arranged in the circumferential direction. The 4th to 6th V-phase coils V4, V5, and V6 are continuously located in the circumferential direction at 180-degree facing positions of the three teeth 16 in which the 1st to 3rd V-phase coils V1, V2, and V3 are wound. It is wound around three teeth 16 that are lined up. Specifically, the first V-phase coil V1 and the fourth V-phase coil V4 are arranged at positions facing each other by 180 degrees. Further, the second V-phase coil V2 and the fifth V-phase coil V5 are arranged at positions facing each other by 180 degrees. The third V-phase coil V3 and the sixth V-phase coil V6 are arranged at positions facing each other by 180 degrees. Further, the first V-phase coil V1 is arranged next to the third U-phase coil U3. Further, the 4th V-phase coil V4 is arranged next to the 6th U-phase coil U6.

The same applies to the W phase, and the first to third W phase coils W1, W2, and W3 are wound around three teeth 16 that are continuously arranged in the circumferential direction. The fourth to sixth W-phase coils W4, W5, and W6 are continuously located in the circumferential direction at 180-degree facing positions of the three teeth 16 in which the first to third W-phase coils W1, W2, and W3 are wound, respectively. It is wound around three teeth 16 that are lined up. Specifically, the first W-phase coil W1 and the fourth W-phase coil W4 are arranged at positions facing each other by 180 degrees. Further, the second W phase coil W2 and the fifth W phase coil W5 are arranged at positions facing each other by 180 degrees. The third W-phase coil W3 and the sixth W-phase coil W6 are arranged 180 degrees opposite to each other. The first W-phase coil W1 is arranged next to the third V-phase coil V3. Further, the third W phase coil W3 is arranged next to the fourth U phase coil U4. Further, the 4th W phase coil W4 is arranged next to the 6th V phase coil V6. The 6th W phase coil W6 is arranged next to the 1st U phase coil U1.

Here, in the configuration shown in FIG. 3, an insulating member 50 substantially similar to the above embodiment is interposed between the different-phase coils adjacent to each other in the circumferential direction. Specifically, an insulating member 50 is interposed between the first U-phase coil U1 and the sixth W-phase coil W6 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the third U-phase coil U3 and the first V-phase coil V1 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the third V-phase coil V3 and the first W-phase coil W1 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the third W phase coil W3 and the fourth U phase coil U4 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the 6th U-phase coil U6 and the 4th V-phase coil V4 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the 6th V-phase coil V6 and the 4th W-phase coil W4 that are adjacent to each other in the circumferential direction.

Further, in the configuration shown in FIG. 3, an insulating member such as the insulating member 50 is not interposed between the coils other than the above six locations, and the coils at the locations where the insulating member is not interposed are interposed between the coils. The coils are opposed to each other in the circumferential direction, or the coils are in contact with each other. Specifically, the places where the insulating member is not interposed are between the coils of the same phase, between the two coils of the first U phase coil U1 to the third U phase coil U3, and between the first V phase coil V1 to the third V phase coil V3. Between two coils, between two coils of the first W phase coil W1 to the third W phase coil W3, between the two coils of the fourth U phase coil U4 to the sixth U phase coil U6, between the two coils of the fourth V phase coil V4 to the sixth V. It is between the two coils of the phase coil V6 and between the two coils of the fourth W phase coil W4 to the sixth W phase coil W6.

According to the above configuration, of the U-phase coils U1 to U6, the V-phase coils V1 to V6, and the W-phase coils W1 to W6, the coil farthest from the neutral points 21 and 31 of the star connection in each phase and the star connection The coils connected to the neutral points 21 and 31 are arranged next to each other in different phases. Specifically, the combinations of the adjacent different-phase coils are the combination of the first U-phase coil U1 and the sixth W-phase coil W6, the combination of the third U-phase coil U3 and the first V-phase coil V1, and the third V-phase coil V3 and the first. Combination of 1W phase coil W1, combination of 3rd W phase coil W3 and 4U phase coil U4, combination of 6th U phase coil U6 and 4V phase coil V4, and combination of 6th V phase coil V6 and 4W phase coil W4 Is. An insulating member 50 is interposed between the coils of each combination.

Even with the configuration shown in FIG. 3, since the insulating member 50 is arranged only between the out-of-phase coils instead of providing the insulating member between all the coils adjacent to each other in the circumferential direction, the number of insulating members provided between the coils Can be suppressed. Further, in the configuration shown in FIG. 3, the coils having the maximum potential difference (for example, the first U-phase coil U1 and the first W-phase coil W1) are not adjacent to each other in the circumferential direction. Along with this, the different-phase coils (for example, the third U-phase coil U3 and the third V-phase coil V3) close to the neutral points 21 and 31 are not adjacent to each other in the circumferential direction. Therefore, although it is necessary to interpose the insulating member 50 between the different phase coils, the maximum potential difference between the adjacent different phase coils can be suppressed to be smaller than that of the above embodiment, so that the insulation performance required for the insulating member 50 is lowered. Can be made to.

-In the above embodiment, the number of the plurality of teeth 16 and the number of coils centrally wound around the plurality of teeth 16 is 18, but the number is not limited to this and can be changed as appropriate. For example, in the above embodiment, the second three-phase coil 30 may be omitted and the number of coils may be halved.

Further, the configuration as shown in FIGS. 4 and 5 may be used. In the configuration shown in FIG. 4, the plurality of teeth 16 and the stator winding 14 have 12 coils.

As shown in FIG. 5, the first three-phase coil 20 includes two U-phase coils U11 and U12, two V-phase coils V11 and V12, and two W-phase coils W11 and W12.

The first U-phase coil U11 and the second U-phase coil U12 are connected in series with each other. Specifically, one end of the first U-phase coil U11 is connected to the U-phase output terminal 40u of the inverter 40, and the other end of the first U-phase coil U11 is connected to one end of the second U-phase coil U12. The other end of the second U-phase coil U12 is connected to the neutral point 21. That is, the first U-phase coil U11 and the second U-phase coil U12 are connected in series from the inverter 40 toward the neutral point 21 in this order.

Similarly, the first V-phase coil V11 and the second V-phase coil V12 are connected in series with each other. Specifically, one end of the first V-phase coil V11 is connected to the V-phase output terminal 40v of the inverter 40, and the other end of the first V-phase coil V11 is connected to one end of the second V-phase coil V12. The other end of the second V-phase coil V12 is connected to the neutral point 21. That is, the first V-phase coil V11 and the second V-phase coil V12 are connected in series from the inverter 40 toward the neutral point 21 in this order.

Similarly, the first W phase coil W11 and the second W phase coil W12 are connected in series with each other. Specifically, one end of the first W-phase coil W11 is connected to the W-phase output terminal 40w of the inverter 40, and the other end of the first W-phase coil W11 is connected to one end of the second W-phase coil W12. The other end of the second W phase coil W12 is connected to the neutral point 21. That is, the first W-phase coil W11 and the second W-phase coil W12 are connected in series from the inverter 40 toward the neutral point 21 in this order.

The second three-phase coil 30 includes third and fourth U-phase coils U13 and U14 corresponding to the first and second U-phase coils U11 and U12, respectively. The second three-phase coil 30 includes third and fourth V-phase coils V13 and V14 corresponding to the first and second V-phase coils V11 and V12, respectively. The second three-phase coil 30 includes third and fourth W-phase coils W13 and W14 corresponding to the first and second W-phase coils W11 and W12, respectively.

The 3rd U-phase coil U13 and the 4th U-phase coil U14 are connected in series with each other. Specifically, one end of the third U-phase coil U13 is connected to the U-phase output terminal 40u of the inverter 40, and the other end of the third U-phase coil U13 is connected to one end of the fourth U-phase coil U14. The other end of the fourth U-phase coil U14 is connected to the neutral point 31. That is, the third U-phase coil U13 and the fourth U-phase coil U14 are connected in series from the inverter 40 toward the neutral point 31 in this order.

Similarly, the 3rd V-phase coil V13 and the 4th V-phase coil V14 are connected in series with each other. Specifically, one end of the third V-phase coil V13 is connected to the V-phase output terminal 40v of the inverter 40, and the other end of the third V-phase coil V13 is connected to one end of the fourth V-phase coil V14. The other end of the fourth V-phase coil V14 is connected to the neutral point 31. That is, the third V-phase coil V13 and the fourth V-phase coil V14 are connected in series from the inverter 40 toward the neutral point 31 in this order.

Similarly, the 3rd W phase coil W13 and the 4th W phase coil W14 are connected in series with each other. Specifically, one end of the third W phase coil W13 is connected to the W phase output terminal 40w of the inverter 40, and the other end of the third W phase coil W13 is connected to one end of the fourth W phase coil W14. The other end of the 4th W phase coil W14 is connected to the neutral point 31. That is, the third W phase coil W13 and the fourth W phase coil W14 are connected in series from the inverter 40 toward the neutral point 31 in this order.

Next, the arrangement of the above coils will be described.

As shown in FIG. 4, the coil has a first U-phase coil U11, a second U-phase coil U12, a second V-phase coil V12, in one of the circumferential directions (clockwise in FIG. 4) with respect to the 12 teeth 16. 1st V-phase coil V11, 1st W-phase coil W11, 2nd W-phase coil W12, 4th U-phase coil U14, 3rd U-phase coil U13, 3rd V-phase coil V13, 4th V-phase coil V14, 4th W-phase coil W14, 3rd W The phase coils W13 are provided in this order.

That is, the first and second U-phase coils U11 and U12 are wound around two teeth 16 that are continuously arranged in the circumferential direction. Further, the third and fourth U-phase coils U13 and U14 are arranged continuously in the circumferential direction at 180-degree facing positions of the two teeth 16 in which the first and second U-phase coils U11 and U12 are wound, respectively. It is wound around one tooth 16. Specifically, the first U-phase coil U11 and the fourth U-phase coil U14 are arranged at positions facing each other by 180 degrees. Further, the second U-phase coil U12 and the third W-phase coil W13 are arranged at positions facing each other by 180 degrees. The second U-phase coil U12 and the fourth U-phase coil U14 are concentratedly wound in a forward winding manner, and the first U-phase coil U11 and the third U-phase coil U13 are concentratedly wound in a reverse winding opposite to the forward winding.

The same applies to the V phase, and the first and second V phase coils V11 and V12 are wound around two teeth 16 that are continuously arranged in the circumferential direction. Further, the 3rd and 4th V-phase coils V13 and V14 are continuously arranged in the circumferential direction at 180-degree facing positions of the two teeth 16 in which the 1st and 2nd V-phase coils V11 and V12 are wound, respectively. It is wound around one tooth 16. Specifically, the first V-phase coil V11 and the fourth V-phase coil V14 are arranged at positions facing each other by 180 degrees. Further, the second V-phase coil V12 and the third W-phase coil W13 are arranged at positions facing each other by 180 degrees. The second V-phase coil V12 and the fourth V-phase coil V14 are concentratedly wound in a forward winding manner, and the first V-phase coil V11 and the third V-phase coil V13 are concentratedly wound in a reverse winding opposite to the forward winding. Further, the second V-phase coil V12 is arranged next to the second U-phase coil U12. Further, the 4th V-phase coil V14 is arranged next to the 4th W-phase coil W14.

The same applies to the W phase, and the first and second W phase coils W11 and W12 are wound around two teeth 16 that are continuously arranged in the circumferential direction. Further, the 3rd and 4th W phase coils W13 and W14 are continuously arranged in the circumferential direction at 180 degree facing positions of the two teeth 16 in which the 1st and 2nd W phase coils W11 and W12 are wound, respectively. It is wound around one tooth 16. Specifically, the first W-phase coil W11 and the fourth W-phase coil W14 are arranged at positions facing each other by 180 degrees. Further, the second W-phase coil W12 and the third W-phase coil W13 are arranged at positions facing each other by 180 degrees. The second W-phase coil W12 and the fourth W-phase coil W14 are concentratedly wound in a forward winding manner, and the first W-phase coil W11 and the third W-phase coil W13 are concentratedly wound in a reverse winding opposite to the forward winding. Further, the first W phase coil W11 is arranged next to the first V phase coil V11. The second W-phase coil W12 is arranged next to the fourth U-phase coil U14. The third W phase coil W13 is arranged next to the first U phase coil U11. The 4th W phase coil W14 is arranged next to the 4th V phase coil V14.

Here, the insulating member 50 is interposed between the first U-phase coil U11 and the third W-phase coil W13 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the first V-phase coil V11 and the first W-phase coil W11 that are adjacent to each other in the circumferential direction. Further, an insulating member 50 is interposed between the third U-phase coil U13 and the third V-phase coil V13, which are adjacent to each other in the circumferential direction.

Further, an insulating member such as the insulating member 50 is not interposed between the coils other than the above three locations, and the coils at the locations where the insulating member is not interposed are opposed to each other in the circumferential direction through a gap, or The coils are in contact with each other. Specifically, as the places where the insulating member is not interposed in the same configuration, there are 3 places between the 1st U phase coil U11 to the 1st V phase coil V11 and 3 places from the 1st W phase coil W11 to the 3rd U phase coil U13. Between the coils at the locations, and between the three coils from the third V-phase coil V13 to the third W-phase coil W13.

The operation of the configurations shown in FIGS. 4 and 5 will be described.

In the first three-phase coil 20, the potential difference between the coils of each phase located closer to the inverter 40, that is, the first U-phase coil U11, the first V-phase coil V11, and the first W-phase coil W11 is large. On the other hand, the potential differences between the coils of each phase located closer to the neutral point 21, that is, the second U-phase coil U12, the second V-phase coil V12, and the second W-phase coil W12 are small.

Similarly, in the second three-phase coil 30, the potential differences between the coils of each phase located closer to the inverter 40, that is, the third U-phase coil U13, the third V-phase coil V13, and the third W-phase coil W13 are large. On the other hand, the potential differences between the coils of each phase located closer to the neutral point 31, that is, the 4th U phase coil U14, the 4th V phase coil V14, and the 4th W phase coil W14 are small from each other.

Further, in the first three-phase coil 20 and the second three-phase coil 30 connected in parallel to each other, the corresponding coils have substantially the same potential. That is, the first U-phase coil U11 and the third U-phase coil U13 have substantially the same potential, the first V-phase coil V11 and the third V-phase coil V13 have substantially the same potential, and the first W-phase coil W11 and the third W-phase coil have substantially the same potential. It has substantially the same potential as W13. Further, the second U-phase coil U12 and the fourth U-phase coil U14 have substantially the same potential, the second V-phase coil V12 and the fourth V-phase coil V14 have substantially the same potential, and the second W-phase coil W12 and the fourth W-phase coil have substantially the same potential. It has substantially the same potential as W14.

Here, in the configurations shown in FIGS. 4 and 5, the coils having a large potential difference are arranged adjacent to each other in the circumferential direction. That is, the first U-phase coil U11 and the third W-phase coil W13 are adjacent to each other, the first V-phase coil V11 and the first W-phase coil W11 are adjacent to each other, and the third U-phase coil U13 and the third V-phase coil V13 are adjacent to each other. The insulating member 50 is interposed only between the coils having different phases adjacent to each other and having a large potential difference. That is, the insulating member 50 is arranged only between the coils having a large potential difference that may cause dielectric breakdown of the insulating coating of the electric wire. This makes it possible to minimize the number of insulating members 50. That is, even with the configurations shown in FIGS. 4 and 5, substantially the same effect as that of the above embodiment can be obtained.

-Although this disclosure has been described in accordance with the examples, it is understood that the disclosure is not limited to the examples and structures. The present disclosure also includes various modifications and modifications within an equal range. In addition, various combinations and forms, as well as other combinations and forms that include only one element, more, or less, are also within the scope of the present disclosure.

Claims (5)

1. A stator core (13) having a plurality of teeth (16) provided in the circumferential direction and a coil (U1 to U6, V1 to V6, W1 to W6, U11 to U14, V11 to each) centrally wound around the plurality of teeth. V14, W11 to W14),
   Each of the coils consists of an electric wire having an insulating coating (14a) on its surface.
   A stator that generates a rotating magnetic field based on the supply of three-phase alternating current to the coil.
   Insulating members other than the insulating coating are not interposed between the coils that are adjacent to each other in the circumferential direction and are in phase with each other.
   A stator in which an insulating member (50) different from the insulating coating is interposed between the coils that are adjacent to each other in the circumferential direction and are out of phase with each other.
2. The coil is connected in series with a plurality of U-phase coils (U1 to U6, U11 to U14) connected in series and a plurality of V-phase coils (V1 to V6, V11 to V14) connected in series. Including a plurality of W-phase coils (W1 to W6, W11 to W14)
   The stator according to claim 1, wherein the plurality of U-phase coils, the plurality of V-phase coils, and the plurality of W-phase coils are connected by a star connection.
3. Of the plurality of U-phase coils, the plurality of V-phase coils, and the plurality of W-phase coils, the coils connected to the neutral points of the star connection are arranged next to each other, and the adjacent coils are out-of-phase coils. Therefore, no insulating member other than the insulating coating is interposed between the adjacent coils having different phases.
   Of the plurality of U-phase coils, the plurality of V-phase coils, and the plurality of W-phase coils, the coils farthest from the neutral point in each phase are arranged next to each other, and the adjacent coils are out-of-phase coils. The stator according to claim 2, wherein the insulating member is interposed between adjacent coils having different phases.
4. Among the plurality of U-phase coils, the plurality of V-phase coils, and the plurality of W-phase coils, the coil farthest from the neutral point of the star connection and the coil connected to the neutral point of the star connection are The stator according to claim 2, wherein the stators are arranged next to each other, the adjacent coils are coils of different phases, and the insulating member is interposed between the adjacent coils of different phases.
5. An annular stator (11) and
   A rotor (12) provided inside the stator is provided.
   The stator includes a stator core (13) having a plurality of teeth (16) provided in the circumferential direction, and coils (U1 to U6, V1 to V6, W1 to W6, U11 to each) that are centrally wound around the plurality of teeth. U14, V11 to V14, W11 to W14)
   Each of the coils consists of an electric wire having an insulating coating (14a) on its surface.
   A motor that rotates the rotor by a rotating magnetic field generated in the stator based on the supply of three-phase alternating current to the coil.
   Insulating members other than the insulating coating are not interposed between the coils that are adjacent to each other in the circumferential direction and are in phase with each other.
   A motor in which an insulating member (50) different from the insulating coating is interposed between the coils that are adjacent to each other in the circumferential direction and are out of phase with each other.

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