WO2020188733A1

WO2020188733A1 - Stator, electric motor, compressor, air conditioner, and method for manufacturing stator

Info

Publication number: WO2020188733A1
Application number: PCT/JP2019/011395
Authority: WO
Inventors: 松岡　篤
Original assignee: 三菱電機株式会社
Priority date: 2019-03-19
Filing date: 2019-03-19
Publication date: 2020-09-24
Also published as: JPWO2020188733A1; JP7204887B2

Abstract

A stator (3) comprises: a stator core (31); a three-phase coil (32) attached to the stator core (31) in a distributed winding; a first lacing member (331) for holding a first-phase coil (321) and a second-phase coil (322); a second lacing member (332) for holding the second-phase coil (322) and a third-phase coil (323); and a third lacing member (333) for holding the third-phase coil (323) and the first-phase coil (321). At a coil end (32a) of the three-phase coil (32), the first-phase coil (321), second-phase coil (322), and third-phase coil (323) are arranged in that order in the circumferential direction of the stator core (31). At the coil end (32a), the third-phase coil (323) is positioned closer to the center of the stator core (31) than the first-phase coil (321). There are more second lacing members (332) wound around the three-phase coil (32) than there are of at least one of the first lacing member (331) and the third lacing member (333).

Description

Manufacturing method of stator, electric motor, compressor, air conditioner, and stator

The present invention relates to a stator of an electric motor.

Generally, a magnetizing method is known in which a permanent magnet of a rotor is magnetized using a three-phase coil attached to a stator core. In this magnetizing method, an electromagnetic force is generated when a magnetizing current flows through the three-phase coil, and this electromagnetic force may cause deformation of the three-phase coil. Therefore, in the stator described in Patent Document 1, a string is wound around the three-phase coil in order to prevent deformation of the three-phase coil.

Japanese Unexamined Patent Publication No. 03-118749

However, in the conventional technique, when the permanent magnet of the rotor is magnetized with the rotor placed inside the stator, the three-phase coil of the stator is significantly deformed depending on the connection state of the three-phase coil. It cannot be prevented.

An object of the present invention is that when the permanent magnet of the rotor is magnetized with the rotor placed inside the stator, the three-phase coil of the stator is significantly deformed regardless of the connection state of the three-phase coil. To prevent.

The stator according to one aspect of the present invention is
With the stator core
A three-phase coil, which is attached to the stator core in a distributed winding manner and has a first-phase coil, a second-phase coil, and a third-phase coil, and a first racing material wound around the three-phase coil.
The second racing material wound around the three-phase coil and
It is equipped with a third racing material wound around the three-phase coil.
At the coil end of the three-phase coil, the first-phase coil, the second-phase coil, and the third-phase coil are arranged in this order in the circumferential direction of the stator core.
At the coil end, the third phase coil is located closer to the center of the stator core than the first phase coil.
The first racing material holds the coil of the first phase and the coil of the second phase.
The second racing material holds the coil of the second phase and the coil of the third phase.
The third racing material holds the coil of the third phase and the coil of the first phase.
The second racing material is wound around the three-phase coil more than at least one of the first racing material and the third racing material.
The electric motor according to another aspect of the present invention
With the stator
It includes a rotor arranged inside the stator.
The compressor according to another aspect of the present invention
With a closed container
With the compression device arranged in the closed container,
The electric motor for driving the compression device is provided.
The air conditioner according to another aspect of the present invention is
With the compressor
Equipped with a heat exchanger.
The method for producing a stator according to another aspect of the present invention is
A method for manufacturing a stator having a stator core and a three-phase coil which is attached to the stator core in a distributed winding manner and has a first-phase coil, a second-phase coil, and a third-phase coil.
At the coil end of the three-phase coil, the first-phase coil, the second-phase coil, and the third-phase coil are arranged in this order in the circumferential direction of the stator core, and at the coil end. The three-phase coil is attached to the stator core so that the third-phase coil is located closer to the center of the stator core than the first-phase coil.
The first racing material, the second racing material, and the third racing material are wound around the three-phase coil.
At least one of the second racing material and the third racing material is wound around the three-phase coil in a larger amount than the first racing material.

According to the present invention, when the permanent magnet of the rotor is magnetized with the rotor placed inside the stator, it is possible to prevent significant deformation of the three-phase coil of the stator.

It is a top view which shows schematic structure of the stator which concerns on Embodiment 1 of this invention. It is a figure which shows schematic structure of a three-phase coil. It is a figure which shows another example of the structure of a three-phase coil. It is a schematic diagram which shows an example of the connection method in a three-phase coil. It is a schematic diagram which shows another example of the connection method in a three-phase coil. It is a flowchart which shows an example of the manufacturing process of a stator. It is a figure which shows the insertion process of the coil of the 1st phase in the manufacturing process of a stator. It is a figure which shows the insertion process of the coil of the 2nd phase in the manufacturing process of a stator. It is a figure which shows the insertion process of the 3rd phase coil in the manufacturing process of a stator. It is a top view which shows the example of the structure of the stator which concerns on the modification. It is a flowchart which shows an example of the magnetizing process of a permanent magnet of a rotor. It is a figure which shows an example of the connection state of the three-phase coil connected by the Y connection, and the power source for magnetism in the stator 3 shown in FIG. It is a figure which shows an example of the connection state of the three-phase coil connected by the delta connection, and the power source for magnetism in the stator 3 shown in FIG. It is a figure which shows an example of the connection state of the three-phase coil connected by the Y connection, and the power source for magnetism in the stator 3 shown in FIG. FIG. 5 is a diagram showing an example of a connection state between a three-phase coil connected by a delta connection and a power source for magnetization in the stator 3 shown in FIG. It is a figure which shows the example of the electromagnetic force in the radial direction generated at the coil end of a three-phase coil when the three-phase coil shown in FIG. 14 and FIG. 15 is energized in the magnetizing step of a permanent magnet. It is a figure which shows the example of the electromagnetic force in the axial direction generated at the coil end of a three-phase coil when the three-phase coil shown in FIGS. 14 and 15 is energized in the magnetizing process of a permanent magnet. It is a graph which shows the difference in the magnitude of the electromagnetic force in the radial direction for each connection pattern in a three-phase coil when magnetizing a permanent magnet of a rotor in an electric motor. It is a graph which shows the difference in the magnitude of the electromagnetic force in the axial direction for each connection pattern in a three-phase coil when magnetizing a permanent magnet of a rotor in an electric motor. It is a partial cross-sectional view which shows schematic structure of the electric motor which concerns on Embodiment 2 of this invention. It is sectional drawing which shows schematic structure of the compressor which concerns on Embodiment 3 of this invention. It is a figure which shows schematic structure of the refrigerating air-conditioning apparatus which concerns on Embodiment 4 of this invention.

Embodiment 1.
In the xyz orthogonal coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the electric motor 1 described later, and the x-axis direction (x-axis) is the z-axis direction (z-axis). Indicates a direction orthogonal to, and the y-axis direction (y-axis) indicates a direction orthogonal to both the z-axis direction and the x-axis direction. The axis Ax is the center of the stator 3 and also the center of rotation of the rotor 2, which will be described later. The direction parallel to the axis Ax is also referred to as "axial direction of rotor 2" or simply "axial direction". The radial direction is the radial direction of the rotor 2 or the stator 3 and is a direction orthogonal to the axis Ax. The xy plane is a plane orthogonal to the axial direction. The arrow D1 indicates the circumferential direction centered on the axis Ax. The circumferential direction of the rotor 2 or the stator 3 is also simply referred to as the "circumferential direction".

<Structure of stator 3>
FIG. 1 is a plan view schematically showing the structure of the stator 3 according to the first embodiment of the present invention.
The stator 3 is used in an electric motor (for example, an electric motor 1 described later).

The stator 3 includes a stator core 31, a three-phase coil 32, at least one first racing material 331, at least one second racing material 332, at least one third racing material 333, and a varnish 34. And have. In this embodiment, the three-phase coil 32 has six poles.

The stator core 31 has a plurality of slots 311 in which the three-phase coil 32 is arranged. In the example shown in FIG. 1, the stator core 31 has 18 slots 311. Therefore, the number of slots for each pole and each phase is 1.

FIG. 2 is a diagram schematically showing the structure of the three-phase coil 32.
The three-phase coil 32 is attached to the stator core 31 in a distributed winding manner. As shown in FIG. 2, the three-phase coil 32 has a coil side 32b arranged in the slot 311 and a coil end 32a not arranged in the slot 311. Each coil end 32a is an axial end of the three-phase coil 32.

In the present embodiment, the three-phase coil 32 has three first-phase coils 321, three second-phase coils 322, and three third-phase coils 323. However, the number of the first phase coil 321 and the number of the second phase coil 322 and the number of the third phase coil 323 are not limited to this embodiment. In this embodiment, the stator 3 has the structure shown in FIG. 1 at the two coil ends 32a. However, the stator 3 may have the structure shown in FIG. 1 at one of the two coil ends 32a.

FIG. 3 is a diagram showing another example of the structure of the three-phase coil 32.
The three-phase coil 32 shown in FIG. 3 has one first-phase coil 321 and one second-phase coil 322 and one third-phase coil 323. In this case, the three-phase coil 32 is attached to the stator core 31 by wave winding.

The three-phase coil 32 has a first phase, a second phase, and a third phase. For example, the first phase is the U phase, the second phase is the V phase, and the third phase is the W phase. In the present embodiment, when a current flows through the three-phase coil 32, the three-phase coil 32 forms six poles.

FIG. 4 is a schematic view showing an example of a wiring method for the three-phase coil 32.
The connection method for the three-phase coil 32 is, for example, Y connection. In other words, the three-phase coil 32 is connected by, for example, a Y connection. In this case, the first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a Y connection.

FIG. 5 is a schematic view showing another example of the wiring method in the three-phase coil 32.
The connection method for the three-phase coil 32 may be delta connection as shown in FIG. In other words, the three-phase coil 32 may be connected by, for example, a delta connection. In this case, the first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a delta connection.

As shown in FIG. 1, the three-phase coil 32 has a plurality of portions 321a corresponding to the first phase, a plurality of portions 322a corresponding to the second phase, and a plurality of portions 323a corresponding to the third phase.

In the example shown in FIG. 1, at each coil end 32a of the three-phase coil 32 (that is, in the xy plane), the portion 321a corresponding to the first phase and the portion corresponding to the second phase of the three-phase coil 32. The 322a and the portion 323a corresponding to the third phase are arranged in this order in the circumferential direction of the stator core 31. That is, at each coil end 32a of the three-phase coil 32, the first-phase coil 321 and the second-phase coil 322, and the third-phase coil 323 are arranged in this order in the circumferential direction of the stator core 31.

In each coil end 32a, the portion 321a corresponding to the first phase of the three-phase coil 32 is referred to as "first phase portion 321a". In each coil end 32a, the portion 322a corresponding to the second phase of the three-phase coil 32 is referred to as a "second phase portion 322a". In each coil end 32a, the portion 323a corresponding to the third phase of the three-phase coil 32 is referred to as a "third-phase portion 323a".

That is, the first-phase coil 321 has a plurality of first-phase portions 321a, the second-phase coil 322 has a plurality of second-phase portions 322a, and the third-phase coil 323 has a plurality of third phases. It has a phase portion 333a.

In other words, each first phase portion 321a is a part of the first phase coil 321 at the coil end 32a in the three phase coil 32, and each second phase portion 322a is the first at the coil end 32a in the three phase coil 32. It is a part of the two-phase coil 322, and each third-phase portion 323a is a part of the third-phase coil 323 at the coil end 32a of the three-phase coil 32.

That is, at each coil end 32a, the first phase portion 321a, the second phase portion 322a, and the third phase portion 323a of the three-phase coils 32 are arranged in this order in the circumferential direction of the stator core 31.

As shown in FIG. 1, at each coil end 32a of the three-phase coil 32 (ie, in the xy plane), the third-phase coil 323 is closer to the center of the stator core 31 than the first-phase coil 321. positioned. Specifically, at each coil end 32a of the three-phase coil 32, the portion corresponding to the third phase of the three-phase coil 32, that is, the third-phase portion 323a is the first phase of the three-phase coil 32. It is located closer to the center of the stator core 31 than the portion corresponding to, that is, the first phase portion 321a. In other words, at each coil end 32a of the three-phase coil 32, the third-phase coil 323 is located closer to the axis Ax than the first-phase coil 321.

At least one first racing material 331, at least one second racing material 332, and at least one third racing material 333 are wound around a three-phase coil 32.

The first racing material 331, the second racing material 332, and the third racing material 333 are, for example, strings.

The first racing material 331 holds the first phase portion 321a of the three-phase coil 32 and the second phase portion 322a of the three-phase coil 32. That is, the first racing material 331 holds the first phase coil 321 and the second phase coil 322. In other words, the first racing material 331 is wound around the first phase coil 321 and the second phase coil 322. As a result, the first phase coil 321 and the second phase coil 322 are fastened by the first racing material 331.

The second racing material 332 holds the second phase portion 322a of the three-phase coil 32 and the third phase portion 323a of the three-phase coil 32. That is, the second racing material 332 holds the second phase coil 322 and the third phase coil 323. In other words, the second racing material 332 is wound around the second phase coil 322 and the third phase coil 323. As a result, the second-phase coil 322 and the third-phase coil 323 are fastened by the second racing material 332.

The third racing material 333 holds the third phase portion 323a of the three-phase coil 32 and the first phase portion 321a of the three-phase coil 32. That is, the third racing material 333 holds the coil 323 of the third phase and the coil 321 of the first phase. In other words, the third racing material 333 is wound around the third phase coil 323 and the first phase coil 321. As a result, the third phase coil 323 and the first phase coil 321 are fastened by the third racing material 333.

Varnish 34 is attached to the first racing material 331. As a result, the first racing material 331 is fixed to the three-phase coil 32. Similarly, the varnish 34 is attached to the second racing material 332. As a result, the second racing material 332 is fixed to the three-phase coil 32. Similarly, the varnish 34 is attached to the third racing material 333. As a result, the third racing material 333 is fixed to the three-phase coil 32.

At least one of the second racing material 332 and the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. In other words, at least one of the number of turns of the second racing material 332 and the number of turns of the third racing material 333 is larger than the number of turns of the first racing material 331.

In the example shown in FIG. 1, the second racing material 332 is wound around the three-phase coil 32 more than at least one of the first racing material 331 and the third racing material 333. In other words, the number of turns of the second racing material 332 is greater than at least one of the number of turns of the first racing material 331 and the number of turns of the third racing material 333. In the example shown in FIG. 1, the second racing material 332 is wound around the three-phase coil 32 more than the third racing material 333. Specifically, the number of turns of the second racing material 332 is larger than the number of turns of the third racing material 333, and is the same as the number of turns of the first racing material 331.

However, the second racing material 332 may be wound around the three-phase coil 32 more than both the first racing material 331 and the third racing material 333. That is, the number of turns of the second racing material 332 may be larger than both the number of turns of the first racing material 331 and the number of turns of the third racing material 333.

The amount of varnish 34 adhering to the second racing material 332 is out of the amount of varnish 34 adhering to the first racing material 331 and the amount of varnish 34 adhering to the third racing material 333. More than at least one of them. In the example shown in FIG. 1, the amount of varnish 34 adhering to the second racing material 332 is larger than the amount of varnish 34 adhering to the third racing material 333, and the first racing material 331 It is the same as the amount of varnish 34 attached to. The amount of varnish 34 adhering to the second racing material 332 is both the amount of varnish 34 adhering to the first racing material 331 and the amount of varnish 34 adhering to the third racing material 333. May be more.

<Manufacturing method of stator 3>
An example of a method for manufacturing the stator 3 will be described.
FIG. 6 is a flowchart showing an example of the manufacturing process of the stator 3.

FIG. 7 is a diagram showing an insertion step of the first phase coil 321 in step S11.
In step S11, as shown in FIG. 7, the first phase coil 321 is attached to the prefabricated stator core 31 in a distributed winding manner. Specifically, the first phase coil 321 is inserted into the slot 311 of the stator core 31 with an insertion device.

FIG. 8 is a diagram showing an insertion step of the second phase coil 322 in step S12.
In step S12, as shown in FIG. 8, the second phase coil 322 is attached in a distributed winding manner. Specifically, the second phase coil 322 is inserted into the slot 311 of the stator core 31 with an insertion tool.

FIG. 9 is a diagram showing an insertion step of the third phase coil 323 in step S13.
In step S13, as shown in FIG. 9, the third phase coil 323 is attached in a distributed winding manner. Specifically, the third-phase coil 323 is inserted into the slot 311 of the stator core 31 with an insertion tool.

In steps S11 to S13, at each coil end 32a of the three-phase coil 32, the portion 321a of the three-phase coil 32 corresponding to the first phase, the portion 322a corresponding to the second phase, and the third phase are supported. The three-phase coil 32 is attached to the stator core 31 so that the portions 323a to be formed are arranged in this order in the circumferential direction of the stator core 31. That is, in steps S11 to S13, at each coil end 32a of the three-phase coil 32, the first-phase coil 321 and the second-phase coil 322, and the third-phase coil 323 are arranged in this order in the circumferential direction of the stator core 31. The three-phase coils 32 are attached to the stator core 31 so that they are arranged.

Further, in steps S11 to S13, at each coil end 32a of the three-phase coil 32, the portion corresponding to the third phase of the three-phase coil 32, that is, the third-phase portion 323a is of the three-phase coil 32. The three-phase coil 32 is attached to the stator core 31 so as to be located closer to the center of the stator core 31 than the portion corresponding to the first phase of the above, that is, the first phase portion 321a. That is, in steps S11 to S13, at each coil end 32a of the three-phase coil 32, the three-phase coil 323 is located closer to the center of the stator core 31 than the first-phase coil 321. The coil 32 is attached to the stator core 31.

In step S14, the first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected. For example, the first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by Y connection or delta connection.

In step S15, the first racing material 331, the second racing material 332, and the third racing material 333 are attached to the three-phase coil 32.

Specifically, the first racing material 331 is wound around the first phase coil 321 and the second phase coil 322. More specifically, the first racing material 331 is wound around the first phase portion 321a and the second phase portion 322a. As a result, the first phase coil 321 and the second phase coil 322 are fastened by the first racing material 331.

Similarly, the second racing material 332 is wound around the second phase coil 322 and the third phase coil 323. More specifically, the second racing material 332 is wound around the second phase portion 322a and the third phase portion 323a. As a result, the second phase coil 322 and the third phase coil 323 are fastened by the second racing material 332.

Similarly, the third racing material 333 is wound around the third phase coil 323 and the first phase coil 321. More specifically, the third racing material 333 is wound around the third phase portion 323a and the first phase portion 321a. As a result, the third-phase coil 323 and the first-phase coil 321 are fastened by the third racing material 333.

In step S15, at least one of the second racing material 332 and the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. In the present embodiment, the second racing material 332 is wound around the three-phase coil 32 more than at least one of the first racing material 331 and the third racing material 333. In other words, the number of turns of the second racing material 332 is greater than at least one of the number of turns of the first racing material 331 and the number of turns of the third racing material 333. Is wound around a three-phase coil 32 (specifically, a second phase portion 322a and a third phase portion 323a). For example, the second racing material 332 is wound around the three-phase coil 32 more than the third racing material 333. The second racing material 332 may be wound around the three-phase coil 32 more than both the first racing material 331 and the third racing material 333.

In step S16, the varnish 34 is attached to the first racing material 331, the second racing material 332, and the third racing material 333. For example, the varnish 34 is impregnated with the first racing material 331, the second racing material 332, and the third racing material 333.

Since the second racing material 332 is wound around the three-phase coil 32 more than at least one of the first racing material 331 and the third racing material 333, it adheres to the second racing material 332. The amount of varnish 34 present is greater than at least one of the amount of varnish 34 adhering to the first racing material 331 and the amount of varnish 34 adhering to the third racing material 333. As a result, the holding force of the second racing material 332 is strengthened. As a result, the second-phase coil 322 and the third-phase coil 323 can be firmly fixed, and the amount of varnish 34 in the stator 3 can be reduced.

In step S17, the varnish 34 adhered to the first racing material 331, the second racing material 332, and the third racing material 333 is cured. For example, when the varnish 34 attached to the first racing material 331, the second racing material 332, and the third racing material 333 is heated by a heater, the varnish 34 is cured. As a result, the three-phase coil 32 is fixed by the first racing material 331, the second racing material 332, and the third racing material 333, and the stator 3 shown in FIG. 1 is obtained.

Modification example.
FIG. 10 is a plan view schematically showing an example of the structure of the stator 3 according to the modified example.
The stator 3 according to the modified example has the structure shown in FIG. 10 at the two coil ends 32a. However, the stator 3 according to the modified example may have the structure shown in FIG. 10 at one of the two coil ends 32a.

Hereinafter, the points different from the stator 3 according to the first embodiment will be mainly described with respect to the stator 3 according to the modified example.

In the stator 3 according to the modified example, the third racing material 333 is wound around the three-phase coil 32 more than at least one of the first racing material 331 and the second racing material 332. In the example shown in FIG. 10, the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. More specifically, in the example shown in FIG. 10, each of the second racing material 332 and the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. The third racing material 333 may be wound around the three-phase coil 32 more than both the first racing material 331 and the second racing material 332.

In other words, the number of turns of the third racing material 333 is larger than at least one of the number of turns of the first racing material 331 and the number of turns of the second racing material 332. In the example shown in FIG. 10, each of the number of turns of the second racing material 332 and the number of turns of the third racing material 333 is larger than the number of turns of the first racing material 331. More specifically, in the example shown in FIG. 10, the number of turns of the third racing material 333 is larger than the number of turns of the first racing material 331 and is the same as the number of turns of the second racing material 332. is there. The number of turns of the third racing material 333 may be larger than both the number of turns of the first racing material 331 and the number of turns of the second racing material 332.

The amount of varnish 34 adhering to the third racing material 333 is out of the amount of varnish 34 adhering to the first racing material 331 and the amount of varnish 34 adhering to the second racing material 332. More than at least one of them. In the example shown in FIG. 10, the amount of the varnish 34 adhering to the second racing material 332 and the amount of the varnish 34 adhering to the third racing material 333 are each attached to the first racing material 331. More than the amount of varnish 34 attached. More specifically, in the example shown in FIG. 10, the amount of varnish 34 adhering to the third racing material 333 is larger than the amount of varnish 34 adhering to the first racing material 331. It is the same as the amount of varnish 34 adhering to the second racing material 332. The amount of varnish 34 adhering to the third racing material 333 is both the amount of varnish 34 adhering to the first racing material 331 and the amount of varnish 34 adhering to the second racing material 332. May be more.

The stator 3 according to the modified example can be manufactured by the same method as the method for manufacturing the stator 3 according to the first embodiment. That is, the stator 3 shown in FIG. 10 can be manufactured according to the same steps as the manufacturing steps from step S11 to step S17 shown in FIG.

However, in the modified example, the process in step S15 is different from the process in step S15 of the method for manufacturing the stator 3 according to the first embodiment.

Specifically, in step S15, the third racing material 333 is wound around the three-phase coil 32 more than at least one of the first racing material 331 and the second racing material 332. In other words, the number of turns of the third racing material 333 is greater than at least one of the number of turns of the first racing material 331 and the number of turns of the second racing material 332. Is wound around a three-phase coil 32 (specifically, a third-phase portion 323a and a first-phase portion 321a). For example, the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. The third racing material 333 may be wound around the three-phase coil 32 more than both the first racing material 331 and the second racing material 332.

<Method of magnetizing a permanent magnet of a rotor using a stator 3>
A method of magnetizing a permanent magnet of a rotor using a stator 3 will be described.
FIG. 11 is a flowchart showing an example of a magnetizing process of the permanent magnet of the rotor.

In step S21, the stator 3 is fixed. For example, the stator 3 is fixed in the compressor or the electric motor by a fixing method such as press fitting or shrink fitting.

In step S22, the rotor is arranged inside the stator 3. At least one permanent magnet is attached to this rotor.

In step S23, the three-phase coil 32 is connected to a magnetic power source (also simply referred to as a power source).
FIG. 12 shows an example of the connection state between the three-phase coil 32 connected by the Y connection and the power supply for magnetization in the stator 3 according to the first embodiment, that is, the stator 3 shown in FIG. It is a figure.
FIG. 13 shows an example of the connection state between the three-phase coil 32 connected by the delta connection and the power supply for magnetization in the stator 3 according to the first embodiment, that is, the stator 3 shown in FIG. It is a figure.

In the example shown in FIG. 12, the positive side of the power supply is connected to the coil 322 of the second phase, and the negative side of the power supply is connected to the coil 321 of the first phase and the coil 323 of the third phase. In the example shown in FIG. 13, the positive side of the power supply is connected to the coil 321 of the first phase and the coil 322 of the second phase, and the negative side of the power supply is connected to the coil 322 of the second phase and the coil 323 of the third phase. Has been done.

FIG. 14 is a diagram showing an example of a connection state between the three-phase coil 32 connected by the Y connection and the power supply for magnetization in the stator 3 according to the modified example, that is, the stator 3 shown in FIG. is there.
FIG. 15 is a diagram showing an example of a connection state between the three-phase coil 32 connected by the delta connection and the power supply for magnetization in the stator 3 according to the modified example, that is, the stator 3 shown in FIG. is there.

In the example shown in FIG. 14, the positive side of the power supply is connected to the coil 323 of the third phase, and the negative side of the power supply is connected to the coil 321 of the first phase and the coil 322 of the second phase. In the example shown in FIG. 15, the positive side of the power supply is connected to the second phase coil 322 and the third phase coil 323, and the negative side of the power supply is connected to the first phase coil 321 and the third phase coil 323. Has been done.

In step S24, the position of the rotor having at least one permanent magnet (specifically, the phase of the rotor) is fixed with a jig.

In step S25, the permanent magnet is magnetized. Specifically, a large current is supplied from the power source to the three-phase coil 32.

In the example shown in FIG. 12, a large current flows from the power supply to the coil 322 of the second phase, and the current from the coil 322 of the second phase branches into the coil 321 of the first phase and the coil 323 of the third phase. The current flowing through the second-phase coil 322 is larger than the current flowing through the first-phase coil 321 and the current flowing through the third-phase coil 323.

In the example shown in FIG. 13, a large current flows from the power supply to the second phase coil 322. In other words, the current flowing through the second phase coil 322 is larger than the current flowing through the first phase coil 321 and the current flowing through the third phase coil 323.

In the example shown in FIG. 14, a large current flows from the power supply to the coil 323 of the third phase, and the current from the coil 323 of the third phase branches into the coil 321 of the first phase and the coil 322 of the second phase. The current flowing through the coil 323 of the third phase is larger than the current flowing through the coil 321 of the first phase and the current flowing through the coil 322 of the second phase.

In the example shown in FIG. 15, a large current flows from the power supply to the coil 323 of the third phase. In other words, the current flowing through the coil 323 of the third phase is larger than the current flowing through the coil 321 of the first phase and the current flowing through the coil 322 of the second phase.

As shown in FIGS. 12 to 15, a magnetic field is generated by the current flowing from the power supply to the three-phase coil 32, and the permanent magnet of the rotor is magnetized.

In step S26, the jig used in step S24 is removed from the rotor.

<Advantages of stator 3>
The advantages of the stator 3 (including the modified example) according to the first embodiment will be described.

As described above, the stator 3 according to the first embodiment is applied to, for example, an electric motor having a rotor having a permanent magnet. For example, in the manufacturing process of an electric motor, specifically, in the magnetizing process of a permanent magnet, a large current is passed through the three-phase coil 32 of the stator 3 in a state where the rotor is arranged inside the stator 3 to rotate the stator 3. Magnetize the child's permanent magnet.

FIG. 16 shows the diameter generated at the coil end 32a of the three-phase coil 32 when the three-phase coil 32 shown in FIGS. 14 and 15 is energized in the manufacturing process of the electric motor, specifically, the magnetizing process of the permanent magnet. It is a figure which shows the example of the electromagnetic force F1 in a direction.
In the examples shown in FIGS. 14 and 15, when a current flows through the three-phase coil 32 from the magnetizing power source, as shown in FIG. 16, the second-phase coil 322 and the third-phase coil 323 A radial electromagnetic force F1 that repels each other is generated between them, and a radial electromagnetic force F1 that repels each other is generated between the first phase coil 321 and the third phase coil 323. This electromagnetic force F1 is also called Lorentz force.

FIG. 17 shows a shaft generated at the coil end 32a of the three-phase coil 32 when the three-phase coil 32 shown in FIGS. 14 and 15 is energized in the manufacturing process of the electric motor, specifically, the magnetizing process of the permanent magnet. It is a figure which shows the example of the electromagnetic force F2 in a direction.

Generally, when a current flows through a curved path such as a coil end, there is a difference in the magnetic flux density generated by the current between the inside and the outside in the curved portion, and a force is applied to the coil so that these magnetic flux densities are equal. Occurs. As a result, at the coil end, a force is generated in which the coil end tends to deform linearly. Since both ends of the coil end are fixed to the stator core, a force acts in the axial direction at the coil end. Therefore, when a current flows from the magnetizing power source to the three-phase coil 32, an electromagnetic force F2 in the axial direction is generated in the three-phase coil 32 as shown in FIG.

FIG. 18 is a graph showing the difference in the magnitude of the electromagnetic force F1 in the radial direction for each connection pattern in the three-phase coil 32 when the permanent magnet of the rotor in the electric motor is magnetized. The data shown in FIG. 18 is the result of analysis by electromagnetic field analysis.

In the connection pattern C1, a large current flows from the magnetizing power supply to the coil 321 of the first phase, and the current flowing through the coil 321 of the first phase is the current flowing through the coil 322 of the second phase and the coil 323 of the third phase. Greater than each of the currents flowing through.

In the connection pattern C2, a large current flows from the magnetizing power supply to the second phase coil 322, and the current flowing through the second phase coil 322 is the current flowing through the first phase coil 321 and the third phase coil 323. Greater than each of the currents flowing through. The connection pattern C2 corresponds to, for example, the connection state shown in FIGS. 12 and 13.

In the connection pattern C3, a large current flows from the magnetizing power supply to the coil 323 of the third phase, and the current flowing through the coil 323 of the third phase is the current flowing through the coil 321 of the first phase and the coil 322 of the second phase. Greater than each of the currents flowing through. The connection pattern C3 corresponds to, for example, the connection state shown in FIGS. 14 and 15.

At each coil end 32a of the three-phase coil 32, the third-phase coil 323 is located closer to the axis Ax than the first-phase coil 321. Therefore, when the permanent magnet of the rotor in the electric motor is magnetized, the coil 323 of the third phase may come off from the stator core 31. As shown in FIG. 18, particularly in the connection pattern C1, when the permanent magnet of the rotor in the electric motor is magnetized, the electromagnetic force F1 in the radial direction generated in the coil 321 of the first phase is very large. That is, since the coil 323 of the third phase is susceptible to the repulsive force generated between the coil 321 of the first phase and the coil 323 of the third phase, the coil 323 of the third phase is disengaged from the stator core 31 by this repulsive force. there is a possibility.

Therefore, in the present embodiment, at least one of the second racing material 332 and the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. That is, the third-phase coil 323 is firmly held by at least one of the second racing material 332 and the third racing material 333. As a result, the three-phase coil 32, particularly the third-phase coil 323, is firmly fixed to at least one of the second racing material 332 and the third racing material 333 regardless of the connection pattern in the three-phase coil 32. When the permanent magnet of the rotor is magnetized with the rotor placed inside the stator 3, the three-phase coil 32 of the stator 3 is significantly deformed regardless of the connection state of the three-phase coil. Can be prevented. As a result, the quality of the stator 3 can be improved.

Further, since at least one of the second racing material 332 and the third racing material 333 needs to be wound around the three-phase coil 32 more than the first racing material 331, the number of racing materials is reduced. The cost of the stator 3 can be reduced. This makes it possible to efficiently prevent significant deformation of the three-phase coil 32.

Further, the amount of the varnish 34 adhering to the second racing material 332 is the amount of the varnish 34 adhering to the first racing material 331 and the amount of the varnish 34 adhering to the third racing material 333. More than at least one of them. As a result, the holding force of the second racing material 332 is strengthened, and the second phase coil 322 and the third phase coil 323, particularly the third phase coil 323 can be firmly fixed. As a result, significant deformation of the three-phase coil 32 can be prevented.

The amount of varnish 34 adhering to the second racing material 332 may be larger than the amount of varnish 34 adhering to the third racing material 333. In this case, the amount of the varnish 34 in the stator 3 can be reduced, and the cost of the stator 3 can be reduced. This makes it possible to efficiently prevent significant deformation of the three-phase coil 32.

If each of the second racing material 332 and the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331, the third-phase coil 323 can be more firmly fixed. it can. As a result, significant deformation of the three-phase coil 32 can be prevented.

Further, each of the amount of the varnish 34 adhering to the second racing material 332 and the amount of the varnish 34 adhering to the third racing material 333 are attached to the first racing material 331. If the amount is greater than the amount of, the third phase coil 323 can be more firmly fixed. As a result, significant deformation of the three-phase coil 32 can be prevented.

FIG. 19 is a graph showing the difference in the magnitude of the electromagnetic force F2 in the axial direction for each connection pattern in the three-phase coil 32 when the permanent magnet of the rotor in the electric motor is magnetized. The data shown in FIG. 19 is the result of analysis by electromagnetic field analysis. In FIG. 19, the connection patterns C1, C2, and C3 correspond to the connection patterns C1, C2, and C3 in FIG. 18, respectively.

As shown in FIG. 19, with respect to the electromagnetic force F2 in the axial direction, a large electromagnetic force F2 in the axial direction is generated in one of the three-phase coils 32 regardless of the connection pattern. Specifically, in the connection pattern C1, a large current flows from the power supply to the coil 321 of the first phase, and a large electromagnetic force F2 in the axial direction is generated in the coil 321 of the first phase. In the connection pattern C2, a large current flows from the power source to the coil 322 of the second phase, and a large electromagnetic force F2 in the axial direction is generated in the coil 322 of the second phase. In the connection pattern C3, a large current flows from the power source to the coil 323 of the third phase, and a large electromagnetic force F2 in the axial direction is generated in the coil 323 of the third phase.

Therefore, in a desirable example of the stator 3, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet, the current supplied from the power supply flows through the second-phase coil 322 and the second-phase coil. The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a Y connection so that the current from 322 branches into the first phase coil 321 and the third phase coil 323. (Connection pattern C2). In this case, it is desirable that the second racing material 332 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the second phase coil 322 with respect to the axial electromagnetic force F2 generated in the second phase coil 322. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

In another desirable example of the stator 3, when a current is passed from the power supply to the 3-phase coil 32 to magnetize the permanent magnet, the current supplied from the power supply flows through the 3rd phase coil 323 and the 3rd phase coil. The first phase coil 321 and the second phase coil 322 and the third phase coil 323 are connected by a Y connection so that the current from 323 branches into the first phase coil 321 and the second phase coil 322. (Connection pattern C3). In this case, it is desirable that the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the third phase coil 323 with respect to the axial electromagnetic force F2 generated in the third phase coil 323. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

In yet another desirable example of the stator 3, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet, the current flowing from the power supply to the second-phase coil 322 is transferred to the first-phase coil 321. The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a delta connection so as to be larger than each of the flowing current and the current flowing through the third phase coil 323. .. In this case, it is desirable that the second racing material 332 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the second phase coil 322 with respect to the axial electromagnetic force F2 generated in the second phase coil 322. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

In yet another desirable example of the stator 3, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet, the current flowing from the power supply to the third-phase coil 32 is transferred to the first-phase coil 321. The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a delta connection so as to be larger than each of the flowing current and the current flowing through the second phase coil 322. .. In this case, it is desirable that the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the third phase coil 323 with respect to the axial electromagnetic force F2 generated in the third phase coil 323. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

Embodiment 2.
FIG. 20 is a partial cross-sectional view schematically showing the structure of the electric motor 1 according to the second embodiment of the present invention.

The electric motor 1 has a rotor 2, a stator 3 (including a modified example) according to the first embodiment,

bearings

14a and 14b, and a shaft 16 fixed to the rotor 2. As shown in FIG. 20, the electric motor 1 may further have a bracket 13 (also referred to as a frame). The electric motor 1 is, for example, a permanent magnet synchronous motor.

The rotor 2 is rotatably arranged inside the stator 3. The rotor 2 has at least one permanent magnet 21. There is an air gap between the rotor 2 and the stator 3. The rotor 2 rotates about the axis Ax.

Since the electric motor 1 according to the second embodiment has the stator 3 according to the first embodiment, it has the advantages described in the first embodiment.

For example, in a desirable example of the electric motor 1, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet 21, the current supplied from the power supply flows through the second-phase coil 322 and the second-phase coil The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a Y connection so that the current from 322 branches into the first phase coil 321 and the third phase coil 323. (Connection pattern C2). In this case, it is desirable that the second racing material 332 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the second phase coil 322 with respect to the axial electromagnetic force F2 generated in the second phase coil 322. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

In another desirable example of the motor 1, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet 21, the current supplied from the power supply flows through the third-phase coil 323 and the third-phase coil. The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a Y connection so that the current from 323 branches into the first phase coil 321 and the second phase coil 322. (Connection pattern C3). In this case, it is desirable that the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the third phase coil 323 with respect to the axial electromagnetic force F2 generated in the third phase coil 323. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

In yet another desirable example of the electric motor 1, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet 21, the current flowing from the power supply to the second-phase coil 322 is transferred to the first-phase coil 321. The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a delta connection so as to be larger than each of the flowing current and the current flowing through the third phase coil 323. .. In this case, it is desirable that the second racing material 332 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the second phase coil 322 with respect to the axial electromagnetic force F2 generated in the second phase coil 322. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

In yet another desirable example of the electric motor 1, when a current is passed from the power supply to the three-phase coil 32 to magnetize the permanent magnet 21, the current flowing from the power supply to the third-phase coil 32 is transferred to the first-phase coil 321. The first phase coil 321 and the second phase coil 322, and the third phase coil 323 are connected by a delta connection so as to be larger than each of the flowing current and the current flowing through the second phase coil 322. .. In this case, it is desirable that the third racing material 333 is wound around the three-phase coil 32 more than the first racing material 331. As a result, as described above, it is possible to increase the holding force for holding the third phase coil 323 with respect to the radial electromagnetic force F1 generated in the first phase coil 321. Further, it is possible to increase the holding force for holding the third phase coil 323 with respect to the axial electromagnetic force F2 generated in the third phase coil 323. As a result, the number of racing materials can be reduced, and significant deformation of the three-phase coil 32 can be efficiently prevented.

Since the electric motor 1 according to the second embodiment has the stator 3 according to the first embodiment, the cost of the electric motor 1 can be reduced and the quality of the electric motor 1 can be improved.

Further, the electric motor 1 according to the second embodiment can be manufactured by using the magnetizing process described in the first embodiment. As a result, the permanent magnet 21 of the rotor 2 can be magnetized inside the electric motor 1, so that the electric motor 1 can be easily assembled as compared with the method of magnetizing outside the electric motor 1.

Embodiment 3.
The compressor 6 according to the third embodiment of the present invention will be described.
FIG. 21 is a cross-sectional view schematically showing the structure of the compressor 6 according to the third embodiment.

The compressor 6 has an electric motor 1 as an electric element, a closed container 61 as a housing, and a compression mechanism 62 as a compression element (also referred to as a compression device). In the present embodiment, the compressor 6 is a rotary compressor. However, the compressor 6 is not limited to the rotary compressor.

The electric motor 1 in the compressor 6 is the electric motor 1 described in the second embodiment. The electric motor 1 drives the compression mechanism 62.

The closed container 61 covers the electric motor 1 and the compression mechanism 62. The closed container 61 is a cylindrical container. Refrigerating machine oil that lubricates the sliding portion of the compression mechanism 62 is stored in the bottom of the closed container 61.

The compressor 6 further has a glass terminal 63 fixed to the closed container 61, an accumulator 64, a suction pipe 65, and a discharge pipe 66.

The compression mechanism 62 is attached to the cylinder 62a, the piston 62b, the upper frame 62c (also referred to as the first frame), the lower frame 62d (also referred to as the second frame), and the upper frame 62c and the lower frame 62d. It has a plurality of mufflers 62e. The compression mechanism 62 further has a vane that divides the inside of the cylinder 62a into a suction side and a compression side. The compression mechanism 62 is arranged in the closed container 61. The compression mechanism 62 is driven by the electric motor 1.

The electric motor 1 is fixed in the closed container 61 by press fitting or shrink fitting. Instead of press fitting and shrink fitting, the motor 1 may be directly attached to the closed container 61 by welding.

Electric power is supplied to the coil of the electric motor 1 (for example, the three-phase coil 32 described in the first embodiment) through the glass terminal 63.

The rotor 2 (specifically, one side of the shaft 16) of the electric motor 1 is rotatably supported by bearings provided on each of the upper frame 62c and the lower frame 62d.

A shaft 16 is inserted through the piston 62b. A shaft 16 is rotatably inserted into the upper frame 62c and the lower frame 62d. The upper frame 62c and the lower frame 62d close the end faces of the cylinder 62a. The accumulator 64 supplies a refrigerant (for example, a refrigerant gas) to the cylinder 62a through the suction pipe 65.

Next, the operation of the compressor 6 will be described. The refrigerant supplied from the accumulator 64 is sucked into the cylinder 62a from the suction pipe 65 fixed to the closed container 61. As the electric motor 1 rotates, the piston 62b fitted to the shaft 16 rotates in the cylinder 62a. As a result, the refrigerant is compressed in the cylinder 62a.

The compressed refrigerant passes through the muffler 62e and rises in the closed container 61. In this way, the compressed refrigerant is supplied to the high pressure side of the refrigeration cycle through the discharge pipe 66.

R410A, R407C, R22, or the like can be used as the refrigerant of the compressor 6. However, the refrigerant of the compressor 6 is not limited to these types. As the refrigerant of the compressor 6, a refrigerant having a small GWP (global warming potential), for example, the following refrigerant can be used.

(1) A halogenated hydrocarbon having a carbon double bond in the composition, for example, HFO (Hydro-Fluoro-Orefin) -1234yf (CF3CF = CH2) can be used. The GWP of HFO-1234yf is 4.
(2) A hydrocarbon having a carbon double bond in the composition, for example, R1270 (propylene) may be used. The GWP of R1270 is 3, which is lower than HFO-1234yf but higher in flammability than HFO-1234yf.
(3) Using a mixture containing at least one of a halogenated hydrocarbon having a carbon double bond in the composition or a hydrocarbon having a carbon double bond in the composition, for example, a mixture of HFO-1234yf and R32. May be good. Since the above-mentioned HFO-1234yf is a low-pressure refrigerant, the pressure loss tends to be large, which may lead to deterioration of the performance of the refrigeration cycle (particularly the evaporator). Therefore, it is practically desirable to use a mixture with R32 or R41, which is a high-pressure refrigerant, rather than HFO-1234yf.

The compressor 6 according to the third embodiment has the advantages described in the first and second embodiments.

Further, since the compressor 6 according to the third embodiment has the electric motor 1 according to the second embodiment, the cost of the compressor can be reduced and the quality of the compressor 6 can be improved.

Further, the compressor 6 according to the third embodiment can be manufactured by using the magnetizing step described in the first embodiment. As a result, the permanent magnet 21 of the rotor 2 can be magnetized inside the compressor 6, so that the compressor 6 can be easily assembled as compared with the method of magnetizing outside the compressor 6.

Embodiment 4.
The refrigerating and air-conditioning apparatus 7 as an air conditioner having the compressor 6 according to the third embodiment will be described.
FIG. 22 is a diagram schematically showing the configuration of the refrigerating and air-conditioning apparatus 7 according to the fourth embodiment of the present invention.

The refrigerating and air-conditioning device 7 can be operated for heating and cooling, for example. The refrigerant circuit diagram shown in FIG. 22 is an example of a refrigerant circuit diagram of an air conditioner capable of cooling operation.

The refrigerating and air-conditioning device 7 according to the fourth embodiment has an outdoor unit 71, an indoor unit 72, and a refrigerant pipe 73 connecting the outdoor unit 71 and the indoor unit 72.

The outdoor unit 71 includes a compressor 6, a condenser 74 as a heat exchanger, a throttle device 75, and an outdoor blower 76 (first blower). The condenser 74 condenses the refrigerant compressed by the compressor 6. The drawing device 75 decompresses the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant. The diaphragm device 75 is also called a decompression device.

The indoor unit 72 has an evaporator 77 as a heat exchanger and an indoor blower 78 (second blower). The evaporator 77 evaporates the refrigerant decompressed by the throttle device 75 to cool the indoor air.

The basic operation of the cooling operation in the refrigerating air conditioner 7 will be described below. In the cooling operation, the refrigerant is compressed by the compressor 6 and flows into the condenser 74. The refrigerant is condensed by the condenser 74, and the condensed refrigerant flows into the drawing device 75. The refrigerant is decompressed by the throttle device 75, and the decompressed refrigerant flows into the evaporator 77. The refrigerant evaporates in the evaporator 77, and the refrigerant (specifically, the refrigerant gas) flows into the compressor 6 of the outdoor unit 71 again. Similarly, when air is sent to the condenser 74 by the outdoor blower 76, heat is transferred between the refrigerant and air, and similarly, when air is sent to the evaporator 77 by the indoor blower 78, heat is transferred between the refrigerant and air. Moving.

The configuration and operation of the refrigerating air conditioner 7 described above is an example, and is not limited to the above-mentioned example.

According to the refrigerating and air-conditioning apparatus 7 according to the fourth embodiment, it has the advantages described in the first to third embodiments.

Further, since the refrigerating air conditioner 7 according to the fourth embodiment has the compressor 6 according to the third embodiment, the cost of the refrigerating air conditioner 7 can be reduced and the quality of the refrigerating air conditioner 7 can be improved. Can be done.

As described above, the preferred embodiments have been specifically described, but it is obvious that those skilled in the art can adopt various modifications based on the basic technical idea and teaching of the present invention. ..

The features in each of the embodiments described above can be combined with each other as appropriate.

1 electric motor, 2 rotor, 3 stator, 6 compressor, 7 refrigeration air conditioner, 31 stator core, 32 3-phase coil, 32a coil end, 34 varnish, 61 closed container, 62 compression mechanism, 74 condenser, 77 evaporator , 321 1st phase coil, 322 2nd phase coil, 323 3rd phase coil, 331 1st racing material, 332 2nd racing material, 333 3rd racing material.

Claims

With the stator core
A three-phase coil, which is attached to the stator core in a distributed winding manner and has a first-phase coil, a second-phase coil, and a third-phase coil, and a first racing material wound around the three-phase coil.
The second racing material wound around the three-phase coil and
It is equipped with a third racing material wound around the three-phase coil.
At the coil end of the three-phase coil, the first-phase coil, the second-phase coil, and the third-phase coil are arranged in this order in the circumferential direction of the stator core.
At the coil end, the third phase coil is located closer to the center of the stator core than the first phase coil.
The first racing material holds the coil of the first phase and the coil of the second phase.
The second racing material holds the coil of the second phase and the coil of the third phase.
The third racing material holds the coil of the third phase and the coil of the first phase.
The second racing material is a stator wound around the three-phase coil more than at least one of the first racing material and the third racing material.
The stator according to claim 1, wherein the second racing material is wound around the three-phase coil in a larger amount than the third racing material.
The stator according to claim 1 or 2, wherein each of the second racing material and the third racing material is wound around the three-phase coil more than the first racing material.
Further comprising the first racing material, the second racing material, and the varnish adhering to the third racing material.
The amount of the varnish adhering to the second racing material is out of the amount of the varnish adhering to the first racing material and the amount of the varnish adhering to the third racing material. The stator according to any one of claims 1 to 3, which is more than at least one of the above.
The stator according to claim 4, wherein the amount of the varnish adhering to the second racing material is larger than the amount of the varnish adhering to the third racing material.
The amount of the varnish adhering to the second racing material and the amount of the varnish adhering to the third racing material are each the amount of the varnish adhering to the first racing material. More than the stator according to claim 4 or 5.
The stator according to any one of claims 1 to 6, wherein the three-phase coil is connected by a Y connection.
The stator according to any one of claims 1 to 6, wherein the three-phase coil is connected by a delta connection.
The stator according to any one of claims 1 to 6 and the stator.
An electric motor that is located inside the stator and includes a rotor with a permanent magnet.
When a current is passed from the power source to the three-phase coil to magnetize the permanent magnet, the current supplied from the power source flows through the second-phase coil, and the current from the second-phase coil is the first. According to claim 9, the first phase coil, the second phase coil, and the third phase coil are connected by a Y connection so as to branch into a one-phase coil and the third-phase coil. The electric motor described.
When a current is passed from the power source to the three-phase coil to magnetize the permanent magnet, the current supplied from the power source flows through the third-phase coil, and the current from the third-phase coil is the first. According to claim 9, the first phase coil, the second phase coil, and the third phase coil are connected by a Y connection so as to branch into a one-phase coil and the second-phase coil. The electric motor described.
When a current is passed from the power supply to the three-phase coil to magnetize the permanent magnet, the current flowing from the power supply to the second-phase coil is the current flowing through the first-phase coil and the third-phase coil. The electric motor according to claim 9, wherein the first phase coil, the second phase coil, and the third phase coil are connected by a delta connection so as to be larger than each of the currents flowing through the motor.
When a current is passed from the power supply to the three-phase coil to magnetize the permanent magnet, the current flowing from the power supply to the third-phase coil is the current flowing through the first-phase coil and the second-phase coil. The electric motor according to claim 9, wherein the first phase coil, the second phase coil, and the third phase coil are connected by a delta connection so as to be larger than each of the currents flowing through the motor.
With a closed container
With the compression device arranged in the closed container,
A compressor including the electric motor according to any one of claims 9 to 13, which drives the compressor.
The compressor according to claim 14,
An air conditioner equipped with a heat exchanger.
A method for manufacturing a stator having a stator core and a three-phase coil which is attached to the stator core in a distributed winding manner and has a first-phase coil, a second-phase coil, and a third-phase coil.
At the coil end of the three-phase coil, the first-phase coil, the second-phase coil, and the third-phase coil are arranged in this order in the circumferential direction of the stator core, and at the coil end. The three-phase coil is attached to the stator core so that the third-phase coil is located closer to the center of the stator core than the first-phase coil.
The first racing material, the second racing material, and the third racing material are wound around the three-phase coil.
A method for manufacturing a stator in which at least one of the second racing material and the third racing material is wound around the three-phase coil in a larger amount than the first racing material.