WO2018003424A1

WO2018003424A1 - Electric motor stator and method for manufacturing same

Info

Publication number: WO2018003424A1
Application number: PCT/JP2017/020946
Authority: WO
Inventors: 純石丸; 佐藤　純一
Original assignee: ダイキン工業株式会社
Priority date: 2016-07-01
Filing date: 2017-06-06
Publication date: 2018-01-04
Also published as: JP2018007413A

Abstract

First, third, and fifth coils (U1+, V1+, W1+) are wound in a first direction around first, third, and fifth teeth (1, 3, 5). Second, fourth, and sixth coils (U2-, V2-, W2-) are wound in a second direction around second, fourth, and sixth teeth (2, 4, 6). Seventh, ninth, and eleventh coils (U3-, V3-, W3-) are wound in the second direction around seventh, ninth, and eleventh teeth (7, 9, 11). Eighth, tenth, and twelfth coils (U4+, V4+, W4+) are wound in the first direction around eighth, tenth, and twelfth teeth (8, 10, 12).

Description

Electric motor stator and method of manufacturing the same

The present invention relates to an electric motor stator and a method for manufacturing the same.

Conventionally, as a stator of an electric motor, there is one shown in FIG. 29 of Japanese Patent No. 5047235 (Patent Document 1).

This conventional motor stator has first to twelfth teeth arranged in sequence. The W-phase wire connected from the power supply terminal to the neutral point is sequentially wound around the first, second, seventh and eighth teeth, and the wire wound around the first and eighth teeth is clockwise. The wire wound around the second and seventh teeth is wound counterclockwise (seen from the front end side of the teeth; hereinafter the same). Moreover, the V-phase wire connected to the neutral point from the power supply terminal is sequentially wound around the third, fourth, ninth and tenth teeth, and the wire wound around the third and tenth teeth is The wire is wound counterclockwise, and the wire wound around the fourth and ninth teeth is wound clockwise. Moreover, the U-phase wire connected to the neutral point from the power supply terminal is wound around the fifth, sixth, eleventh and twelfth teeth sequentially, and the wire wound around the fifth and twelfth teeth is The wire wound in the clockwise direction and the wire wound around the sixth and eleventh teeth are wound counterclockwise.

Japanese Patent No. 5047235

By the way, in the conventional stator of the electric motor, the W-phase coil wound around the first tooth connected to the power supply terminal is clockwise, and the V-phase coil wound around the third tooth connected to the power supply terminal is counterclockwise. This is a U-phase coil counterclockwise wound around the fifth tooth connected to the power supply terminal.

Thus, in the conventional stator of the electric motor, the winding directions of the first U-phase, V-phase, and W-phase coils connected to the power supply terminal are not the same, and the U-phase, V-phase, and W-phase coils connected to them The winding direction is not the same.

For this reason, the conventional stator of the electric motor has a problem that the winding cannot be wound quickly and the structure of the winding machine becomes complicated.

Therefore, an object of the present invention is to provide a stator for an electric motor that can rapidly wind the winding and simplify the structure of the winding machine.

In order to solve the above problems, the stator of the electric motor of the present invention is
In a stator of an electric motor comprising an iron core having first to twelfth teeth arranged in series and a three-phase Y-connected winding concentratedly wound on the first to twelfth teeth,
The first phase winding includes a first end of the first phase, a first coil wound around the first tooth, a second coil wound around the second tooth, and the seventh tooth. The seventh coil wound around the eighth coil, the eighth coil wound around the eighth tooth, and the second end of the first phase are sequentially connected,
The first and eighth coils are wound in the first direction when viewed from the front end side of the first to twelfth teeth, and the second and seventh coils are defined as the first direction. Wound in the opposite second direction,
The second phase winding includes a second phase first end, a tenth coil wound around the tenth tooth, a ninth coil wound around the ninth tooth, and the fourth tooth. A fourth coil wound around the third coil, a third coil wound around the third tooth, and a second end of the second phase are sequentially connected,
When viewed from the front end side of the first to twelfth teeth, the tenth and third coils are wound in the first direction, and the ninth and fourth coils are in the second direction. Is wound,
The third phase winding includes a third phase first end, a fifth coil wound around the fifth tooth, a sixth coil wound around the sixth tooth, and the eleventh tooth. The eleventh coil wound around the twelfth coil, the twelfth coil wound around the twelfth tooth, and the second end of the third phase are sequentially connected,
When viewed from the front end side of the first to twelfth teeth, the fifth and twelfth coils are wound in the first direction, and the sixth and eleventh coils are wound in the second direction. Is wound,
One of the first end and the second end is connected to a power source, and the other of the first end and the second end is connected to a neutral point.

In addition, in this specification, a wire means a magnet wire.

In the stator of the electric motor having the above configuration, the first, third, fifth, eighth, tenth, and tenth stators having three-phase Y-connected windings concentratedly wound around the first to twelfth teeth. The 12 coils are wound in the first direction, while the second, fourth, sixth, seventh, ninth, and eleventh coils are wound in the second direction. Further, the first phase winding is connected in the order of the first end, the first coil, the second coil, the seventh coil, the eighth coil, and the second end, and the third phase winding is The first end, the fifth coil, the sixth coil, the eleventh coil, the twelfth coil, and the second end are connected in this order, while the second phase winding is connected to the second end and the third coil. , The fourth coil, the ninth coil, the tenth coil, and the first end portion are connected in this order, and the first and third phase windings and the second phase winding, The arrangement with the second end is reversed.

Thus, by devising the winding direction of the coil of the three-phase winding, and by devising the arrangement of the first end and the second end of the three-phase winding, that is, the direction of current flow The magnetic field for driving the electric motor to the stator can be generated.

Further, in this way, the arrangement order of the first end and the second end of the first-phase and third-phase windings, and the arrangement order of the first end and the second end of the second-phase winding By reversing the above, it is possible to provide flexibility in the arrangement of windings when adjusting the wiring length.

Further, according to the stator of the electric motor having the above configuration, the first phase first coil wound around the first tooth, the second phase third coil wound around the third tooth, and the fifth tooth. The third coil wound around the third phase has the same spacing between the first, third and fifth teeth, and the winding direction of the first, third and fifth coils is the first. Because the three nozzles rotate in the same direction in the same direction, the three nozzles simultaneously rotate the first, third, and fifth coils in the first direction at the same time. It can be wound around the first, third and fifth teeth.

Next, the second coil of the first phase wound around the second tooth, the fourth coil of the second phase wound around the fourth tooth, and the third phase wound around the sixth tooth. The sixth coil has the same spacing between the second, fourth, and sixth teeth, and the winding directions of the second, fourth, and sixth coils are the same in the second direction. The three nozzles of the wire machine are simultaneously swung in a second direction opposite to the first direction, and the second, fourth, and sixth coils are simultaneously moved in the second direction to the second, fourth, and sixth teeth. Can be wound on.

Next, a first phase seventh coil wound around the seventh tooth, a second phase ninth coil wound around the ninth tooth, and a third phase wound around the eleventh tooth The eleventh coil has the same spacing between the seventh, ninth, and eleventh teeth, and the winding directions of the seventh, ninth, and eleventh coils are the same in the second direction. By rotating the three nozzles of the wire machine in the second direction at the same time, the seventh, ninth, and eleventh coils can be wound around the seventh, ninth, and eleventh teeth in the second direction at the same time. .

Next, the first-phase eighth coil wound around the eighth tooth, the second-phase tenth coil wound around the tenth tooth, and the third-phase wound around the twelfth tooth The twelfth coil has the same spacing between the eighth, tenth and twelfth teeth, and the winding directions of the eighth, tenth and twelfth coils are the same in the first direction. The three nozzles of the wire machine are simultaneously swung in a first direction opposite to the second direction, and the eighth, tenth, and twelfth coils are simultaneously moved in the first direction to the eighth, tenth, and twelfth directions. Can be wound on teeth.

Thus, the first, third, and fifth coils can be simultaneously wound around the first, third, and fifth teeth in the first direction, and the second, fourth, and sixth coils can be wound in the second, fourth, The sixth tooth can be wound in the second direction simultaneously, and the seventh, ninth, and eleventh coils can be simultaneously wound in the second direction on the seventh, ninth, and eleventh teeth, and the eighth, tenth, Since the twelfth coil can be wound around the eighth, tenth and twelfth teeth in the first direction at the same time, the three coils can be wound at the same time by using a winding machine with a simple and inexpensive structure in which the three nozzles can simultaneously rotate only in the same direction. Thus, the stator of the electric motor of the present invention can be manufactured quickly and inexpensively.

In one embodiment,
The first-phase, second-phase, and third-phase windings are each a single seamless wire.

According to the above embodiment, since the first phase, second phase, and third phase windings are each a single seamless wire, without interrupting the three-phase winding of the stator, It can be wound all at once.

Moreover, the method for manufacturing the stator of the electric motor of the present invention
The iron core having the first to twelfth teeth arranged in sequence and the first, second and third wires which are the windings of the first phase, the second phase and the third phase, respectively, and the three which can rotate in the same direction at the same time A winding machine having a single nozzle,
When viewed from the front end side of the first to twelfth teeth, the three nozzles are simultaneously swung in the first direction to move the first, third and fifth teeth to the first, second and fifth teeth, respectively. A third wire is concentratedly wound in the first direction, the first coil wound around the first tooth in the first direction, and the third tooth wound around the first tooth in the first direction. Forming a third coil and a fifth coil wound around the fifth tooth in the first direction,
Next, when viewed from the front end side of the first to twelfth teeth, the three nozzles are simultaneously turned in a second direction opposite to the first direction, so that the second, fourth and sixth A first coil, a second wire, and a third wire are concentratedly wound in the second direction on the teeth, respectively, and a second coil wound around the second teeth in the second direction; and the fourth coil Forming a fourth coil wound around the teeth in the second direction and a sixth coil wound around the sixth teeth in the second direction;
Next, when viewed from the front end side of the first to twelfth teeth, the three nozzles are simultaneously swung in the second direction, and the seventh, ninth, and eleventh teeth are respectively moved to the first. The seventh coil is wound around the seventh tooth in the second direction by concentrating the second and third wires in the second direction, and the second direction is wound around the ninth tooth. A ninth coil wound around the eleventh tooth and an eleventh coil wound around the eleventh tooth in the second direction,
Next, as viewed from the front end side of the first to twelfth teeth, the three nozzles are simultaneously swung in the first direction, so that the eighth, tenth and twelfth teeth are moved to the first, respectively. The second and third wires are concentratedly wound in the first direction, the eighth coil wound around the eighth tooth in the first direction, and the first direction around the tenth tooth. And a twelfth coil wound around the twelfth tooth in the first direction.

According to the method for manufacturing a stator of an electric motor of the present invention, three windings can be simultaneously and rapidly wound using a winding machine having a simple and inexpensive structure in which three nozzles can simultaneously rotate only in the same direction. The stator of the electric motor can be manufactured quickly and inexpensively.

The stator of the electric motor of the present invention can be manufactured quickly and inexpensively.

Further, according to the method of manufacturing the stator of the electric motor of the present invention, the stator of the electric motor can be manufactured quickly and inexpensively using a winding machine having a simple and inexpensive structure in which the three nozzles can simultaneously rotate in the same direction.

It is the model explanatory view which looked at the stator of the electric motor of one embodiment of this invention from the axial direction. FIG. 3 is an explanatory diagram showing a plurality of teeth aligned in a straight line in order to explain a winding direction of a coil of a stator of the motor and a direction in which a winding and a current flow. It is explanatory drawing explaining the manufacturing method of the stator of the said electric motor.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

As shown in FIG. 1, the stator of the electric motor of this embodiment is an outer rotor type electric motor stator, and an iron core 50 made of laminated electromagnetic steel plates has a radius from the base 51 at equal intervals in the circumferential direction. First, second, third,...,

Twelfth teeth

1, 2, 3,. The first, second, third,...,

Twelfth teeth

1, 2, 3,..., 12 are connected to the first coil U1 +, the second coil U1-, the second coil via the insulator 61, respectively. 3 coil V1 +, 4th coil V2-, 5th coil W1 +, 6th coil W2-, 7th coil U3-, 8th coil U4 +, 9th coil V3-, 10th coil V4 +, 11th coil W3-, 1st coil 12 coils W4 + are wound. In FIG. 1, the coils are represented by letters U1 +, U1-, V1 +,.

FIG. 2 is an explanatory diagram for explaining the winding direction of the stator coil of the motor and the direction of current flow through the winding. As shown in FIG. 2, three-phase Y-connected

windings

20, 30, 40 are provided on the first, second, third,...,

Twelfth teeth

1, 2, 3,. It is concentrated.

A winding 20 composed of a U-phase wire (magnet wire) as a first phase includes a first end 21 connected to a U-phase power terminal (not shown) and a first coil U + wound around the first tooth 1. A second coil U2- wound around the second tooth 2, a seventh coil U3- wound around the seventh tooth 7, and an eighth coil U4 + wound around the eighth tooth 8. And a U-phase second end portion 22 connected to a neutral point (not shown) are sequentially connected.

When viewed from the tip side of the first, second, third,...,

Twelfth teeth

1, 2, 3,..., 12, the first and eighth coils U1 +, U4 + The second and seventh coils U2- and U3- are wound in the counterclockwise direction as an example of the direction, and are wound in the clockwise direction as an example of the second direction.

The V-phase winding 30 as the second phase includes a first end 31 connected to a V-phase power supply terminal (not shown), a tenth coil V4 + wound around the tenth tooth, and the ninth tooth. A ninth coil V3- wound around 9, a fourth coil V2- wound around the fourth tooth 4, a third coil V1 + wound around the third tooth 3, and the neutral point. And the V-phase second end portion 32 connected to each other are sequentially connected.

When viewed from the tip side of the first, second, third,...,

Twelfth teeth

1, 2, 3,..., 12, the tenth and third coils V4 +, V1 + The ninth and fourth coils V3- and V2- are wound in the clockwise direction as the second direction.

The third-phase W-phase winding 40 includes a first end 41 connected to a W-phase power terminal (not shown), a fifth coil W1 + wound around the fifth tooth 5, and the sixth phase. A sixth coil W2- wound around the tooth 6, an eleventh coil W3- wound around the eleventh tooth 11, a twelfth coil W4 + wound around the twelfth tooth 12, and the neutral A W-phase second end 42 connected to the point is sequentially connected.

When viewed from the front end side of the first, second, third,...,

Twelfth teeth

1, 2, 3,..., 12, the fifth and twelfth coils W1 +, W4 + The sixth and eleventh coils W2- and W3- are wound in the clockwise direction as the second direction.

In the above description, the

first end portions

21, 31, and 41 are connected to the three-phase power terminals, and the

second end portions

22, 32, and 42 are connected to the neutral point. , 31, 41 may be connected to a neutral point, and the

second end portions

22, 32, 42 may be connected to a three-phase power supply terminal.

In the stator of the electric motor having the above configuration, in the three-phase Y-connection windings concentratedly wound on the first, second, third,...,

Twelfth teeth

1, 2, 3,. The first, third, fifth, eighth, tenth and twelfth coils U1 +, V1 +, W1 +, U4 +, V4 +, W4 + are wound in the counterclockwise direction as the first direction, while the second The fourth, sixth, seventh, ninth and eleventh coils U2-, V2-, W2-, U3-, V3-, W3- are wound in the clockwise direction as the second direction. Further, the U-phase winding 20 is connected in the order of the first end 21, the first coil U1 +, the second coil U2-, the seventh coil U3-, the eighth coil U4 +, and the second end 22. In addition, the W-phase winding 30 is connected in the order of the first end 41, the fifth coil W1 +, the sixth coil W2-, the eleventh coil W3-, the twelfth coil W4 +, and the second end 42. . On the other hand, the V-phase winding 30 is connected in the order of the second end 32, the third coil V1 +, the fourth coil V2-, the ninth coil V3-, the tenth coil V4 +, and the first end 31. . Therefore, in FIG. 2, the U-phase and W-

phase windings

20 and 40 are arranged from the right in the order of the

first end portions

21 and 41 and the

second end portions

22 and 42, whereas the V-phase In the winding 30, the second end portion 32 and the first end portion 31 are arranged in this order from the right.

Thus, the winding direction of the coils of the three-

phase windings

20, 30, 40 is devised in the counterclockwise direction and the clockwise direction, and the first end 21 of the three-

phase windings

20, 30, 40 is provided. , 31, 41 and the

second end portions

22, 32, 42, that is, by devising the direction of current flow, the direction of the current flowing in the coil becomes as shown in the upper part of FIG. A magnetic field for driving the electric motor can be generated.

Further, as shown in FIG. 2, the arrangement order of the

first end portions

21 and 41 and the

second end portions

22 and 42 of the U-phase and W-

phase windings

20 and 40, and the first phase of the V-phase winding 30. By reversing the arrangement order of the end portion 31 and the second end portion 32, it is possible to provide flexibility in the arrangement of the

windings

20, 30, 40 when adjusting the wiring length.

Moreover, the stator of the electric motor having the above configuration is manufactured as follows.

First, as shown in FIG. 3, the iron core 50 having the first, second, third,...,

Twelfth teeth

1, 2, 3,. And a W-

phase wire

20, 30, 40 and a winding machine having three nozzles N1, N2, N3 that can simultaneously rotate in the same direction (portions not related to the present invention are not shown).

The U-phase first coil U1 + wound around the first tooth 1, the V-phase third coil V1 + wound around the third tooth 3, and the W-phase wound around the fifth tooth 5. The fifth coil W1 + has the same spacing between the first, third and

fifth teeth

1, 3 and 5, and the winding directions of the first, third and fifth coils U1 +, V1 + and W1 + are the same. Since it is the same in the counterclockwise direction, as shown in FIG. 3, it is a winding machine with a simple structure in which the three nozzles N1, N2, and N3 simultaneously rotate in the same direction. 40 is fed out from the nozzles N1, N2, and N3, and simultaneously wound around the first, third, and

fifth teeth

1, 3, and 5 by concentrated winding, and the first, third, and fifth coils U1 +, V1 +, and W1 + Generate quickly at the same time.

Next, the U-phase second coil U2- wound around the second tooth 2, the V-phase fourth coil V2- wound around the fourth tooth 4, and the sixth tooth 6 are wound around. The W-phase sixth coil W2- has the same distance between the second, fourth,

sixth teeth

2, 4, 6, and the second, fourth, sixth coils U2-, V2-, Since the winding direction of W2- is the same in the clockwise direction, the three nozzles N1, N2, and N3 shown in FIG. 3 are shifted, and the

windings

20, 30, and 40 are fed from the nozzles N1, N2, and N3. The three nozzles N1, N2, and N3 are simultaneously turned clockwise and wound around the second, fourth, and

sixth teeth

2, 4, and 6 by concentrated winding, and the second, fourth, and sixth coils. U2-, V2-, W2- are generated quickly at the same time.

Next, the U-phase seventh coil U3- wound around the seventh tooth 7, the V-phase ninth coil V3- wound around the ninth tooth 9, and the eleventh tooth 11 are wound around. The W-phase eleventh coil W3- has the same distance between the seventh, ninth,

eleventh teeth

7, 9, 11, and the seventh, ninth, eleventh coils U3-, V3-, Since the winding direction of W3- is the same in the clockwise direction, the three nozzles N1, N2, N3 shown in FIG. 3 are shifted, and the

windings

20, 30, 40 are moved to the three nozzles N1, N2, While feeding from N3, the three nozzles N1, N2, and N3 are simultaneously turned clockwise, and wound on the seventh, ninth, and

eleventh teeth

7, 9, and 11 with concentrated winding, The ninth and eleventh coils U3-, V3-, W3- are simultaneously generated quickly.

Next, a U-phase eighth coil U4 + wound around the eighth tooth 8, a V-phase tenth coil V4 + wound around the tenth tooth 10, and a W wound around the twelfth tooth 12. The twelfth coil W4 + of the phase has the same interval between the eighth, tenth, and

twelfth teeth

8, 10, and 12, and the winding directions of the eighth, tenth, and twelfth coils U4 +, V4 +, and W4 + Are the same in the counterclockwise direction, the three nozzles N1, N2, and N3 shown in FIG. 3 are shifted, and the

windings

20, 30, and 40 are fed out from the three nozzles N1, N2, and N3. The three nozzles N1, N2, and N3 are simultaneously turned counterclockwise and wound around the eighth, tenth, and

twelfth teeth

8, 10, and 12 with concentrated winding, and the eighth, tenth, and tenth 12 coils U4 +, V4 +, W4 + are quickly generated simultaneously

According to the method for manufacturing a stator of an electric motor according to the above-described embodiment, three

windings

20, 20 are used by using a winding machine having a simple and inexpensive structure in which the three nozzles N 1, N 2, and N 3 can simultaneously rotate only in the same direction. 30 and 40 can be rapidly wound simultaneously, and the stator of the electric motor can be manufactured quickly and inexpensively.

In particular, since the winding machine rotates the three nozzles N1, N2, and N3 simultaneously in the same direction, the structure of the winding machine becomes simple and the winding machine becomes inexpensive.

Further, since the three-

phase windings

20, 30, and 40 are each a single seamless wire, the three-

phase windings

20, 30, and 40 of the stator are continuously raised without interruption. Can be wound on.

In the above embodiment, the stator is an outer rotor type stator, but the present invention can be similarly applied even if the stator is an inner rotor type stator.

In the above embodiment, the

first end portions

21, 31, and 41 are connected to the power source, and the

second end portions

22, 32, and 42 are connected to the neutral point. However, the first end portion is connected to the neutral point. The second end may be connected to the power source.

In the above embodiment, the first direction is the counterclockwise direction and the second direction is the clockwise direction. However, the first direction is the clockwise direction and the second direction is the counterclockwise direction. Also good.

In the description of the above embodiment, the case where the first to

twelfth teeth

1, 2, 3,..., 12 are arranged in a straight line and the coil is wound has been described, but the first to twelfth teeth are annular. It goes without saying that the coil can be wound even if it is still arranged.

Further, the number of teeth is not limited to 12, and the stator of the present invention can be applied to a stator including 12 teeth. For example, the stator can be applied to a stator having 24 teeth that is a multiple of 12. Needless to say.

Of course, the constituent elements described in the above embodiments and modifications may be combined as appropriate, and may be selected, replaced, or deleted as appropriate.

1 to 12 1st to 12th teeth U1 + 1st coil U2-2nd coil V1 + 3rd coil V2-4th coil W1 + 5th coil W2-6th coil U3-7th coil U4 + 8th coil V3-9th coil V4 + 10th coil W3- 11th coil W4 +

12th coil

20, 30, 40

Winding

21, 31, 41

First end

22, 32, 42 Second end N1, N2, N3 Nozzle 50 Iron core

Claims

An iron core (50) having first to twelfth teeth (1, 2, 3,..., 12) sequentially arranged, and the first to twelfth teeth (1, 2, 3,..., 12). In a stator of an electric motor having three-phase Y-connected windings (20, 30, 40) concentratedly wound on
The first phase winding (20) includes a first phase first end (21), a first coil (U1 +) wound around the first tooth (1), and the second tooth (2). ), The second coil (U2-) wound around the seventh tooth (7), the seventh coil (U3-) wound around the seventh tooth (7), and the eighth coil wound around the eighth tooth (8). The coil (U4 +) and the second end (22) of the first phase are sequentially connected,
The first and eighth coils (U1 +, U4 +) are wound in the first direction when viewed from the front end side of the first to twelfth teeth (1, 2, 3,..., 12). The second and seventh coils (U2-, U3-) are wound in a second direction opposite to the first direction,
The second phase winding (30) includes a second phase first end (31), a tenth coil (V4 +) wound around the tenth tooth (10), and the ninth tooth (9). ), A fourth coil (V2-) wound around the fourth tooth (4), and a third coil wound around the third tooth (3). The coil (V1 +) and the second end (32) of the second phase are sequentially connected,
The tenth and third coils (V4 +, V1 +) are wound in the first direction when viewed from the front end side of the first to twelfth teeth (1, 2, 3,..., 12). The ninth and fourth coils (V3-, V2-) are wound in the second direction,
The third phase winding (40) includes a third phase first end (41), a fifth coil (W1 +) wound around the fifth tooth (5), and the sixth tooth (6). ) Wound around the sixth coil (W2-), the eleventh coil (W3-) wound around the eleventh tooth (11), and the twelfth coil wound around the twelfth tooth (12). The coil (W4 +) and the third phase second end (42) are sequentially connected,
The fifth and twelfth coils (W1 +, W4 +) are wound in the first direction when viewed from the front end side of the first to twelfth teeth (1, 2, 3,..., 12). The sixth and eleventh coils (W2-, W3-) are wound in the second direction,
One of the first end (21, 31, 41) or the second end (22, 32, 42) is connected to a power source, and the first end (21, 31, 41) or the second end (22 , 32, 42), the other stator being connected to the neutral point.
In the stator of the electric motor according to claim 1,
Each of the first-phase, second-phase, and third-phase windings (20, 30, 40) is a single seamless wire.
The iron core (50) having the first to twelfth teeth (1, 2, 3,..., 12) sequentially arranged, and the first, second and third phase windings respectively. Prepare a winding machine having second and third wires (20, 30, 40) and three nozzles (N1, N2, N3) that can simultaneously rotate in the same direction;
The three nozzles (N1, N2, N3) are simultaneously swung in the first direction when viewed from the front end side of the first to twelfth teeth (1, 2, 3,..., 12), First, second and third wires (20, 30, 40) are concentratedly wound in the first direction on the first, third and fifth teeth (1, 3, 5), respectively. A first coil (U1 +) wound around the first tooth (1) in the first direction, and a third coil (V1 +) wound around the third tooth (3) in the first direction. And a fifth coil (W1 +) wound in the first direction on the fifth tooth (5),
Next, when viewed from the front end side of the first to twelfth teeth (1, 2, 3,..., 12), the three nozzles (N1, N2, N3) are simultaneously moved in the first direction. The first, second, and third wires (20, 30, 40) are turned to the second, fourth, and sixth teeth (2, 4, 6), respectively, by turning in the opposite second direction. Concentrated winding in the second direction, the second coil (U2-) wound in the second direction on the second tooth (2), and the second coil on the fourth tooth (4). A fourth coil (V2-) wound in the direction and a sixth coil (W2-) wound in the second direction on the sixth tooth (6),
Next, when viewed from the tip side of the first to twelfth teeth (1, 2, 3,..., 12), the three nozzles (N1, N2, N3) are simultaneously moved in the second direction. Turn to concentrate the first, second and third wires (20, 30, 40) in the second direction on the seventh, ninth and eleventh teeth (7, 9, 11), respectively. A seventh coil (U3-) wound around the seventh tooth (7) in the second direction, and a seventh coil (U3-) wound around the ninth tooth (9) in the second direction. Nine coils (V3-) and an eleventh coil (W3-) wound around the eleventh tooth (11) in the second direction,
Next, when viewed from the tip side of the first to twelfth teeth (1, 2, 3,..., 12), the three nozzles (N1, N2, N3) are simultaneously moved in the first direction. Rotate to concentrate the first, second and third wires (20, 30, 40) in the first direction on the eighth, tenth and twelfth teeth (8, 10, 12), respectively. An eighth coil (U4 +) wound around the eighth tooth (8) in the first direction and a tenth coil wound around the tenth tooth (10) in the first direction. A method for manufacturing a stator for an electric motor, comprising: forming a coil (V4 +) and a twelfth coil (W4 +) wound around the twelfth tooth (12) in the first direction.