JP2017050964A - Stator of electric motor, electric motor and air-conditioning equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of an electric motor capable of alleviating stress generated in a root portion of an inner wall of an insulator even when the electric motor becomes a high temperature and a coil is thermally expanded, and also to provide the electric motor and air-conditioning equipment.SOLUTION: A stator 10 of an electric motor includes: a substantially cylindrical stator core 1; a substantially cylindrical insulator 2 which is provided at least at one opening end 1a of the stator core 1 and equipped with a winding drum part 2c around which a winding 4 is wound; and an insulator cover 3 fixed to the opening end 2f of the insulator 2. A thermal expansion coefficient Tc of the insulator cover 3 is made higher than a thermal expansion coefficient Tg of the insulator.SELECTED DRAWING: Figure 6A

Description

  The present invention relates to an electric motor stator, an electric motor, and an air conditioner.

  A concentrated winding method is known as a winding method of a coil in a multi-pole, multi-phase motor used as power for various applications. The concentrated winding method is a method in which the winding of the stator (stator) is wound around the teeth (winding body) of the stator via an insulator called an insulator. For example, Patent Document 1 proposes an invention related to a concentrated winding type electric motor.

  As shown in FIGS. 9 to 11, this Patent Document 1 includes HFC as a refrigerant of a hermetic compressor, and a bobbin 108 integrally formed in a slot of a stator core 101 of the electric motor. The teeth of the core iron core 101 are provided with a winding 102 by concentrated winding through the bobbin 108, so that the winding 102 by the concentrated winding, the lead wire 105, the connection point 106 and the like are not scattered to prevent scattering. The anti-scattering insulating cover 109 has a fixing method for fixing the air hole 110 and the lead wire 105 through which the mist-like mixed oil of the refrigerant and refrigerating machine oil flows, A stator for an electric motor characterized in that the material of the bobbin 108 and the insulating cover 109 for preventing scattering is super engineering plastic (super engineering plastic) has been proposed. . As the above-described fixing method, as shown in FIG. 11, the anti-scattering insulating cover 109 is provided with a concave cutout groove 123 for drawing out and fixing the lead wire 105.

In Patent Document 1, in the stator of the electric motor having such a configuration, in order to prevent scattering of the connection points 106 and the windings 102, as shown in FIG. 9, at least one of the bobbin 108 or the scattering prevention insulating cover 109 is provided. It is described that a claw 112 that can be hooked is provided.
Specifically, in FIG. 9, the bobbin 108 has an outer diameter side resin wall (outer wall) 113 and an inner diameter side resin wall (inner wall) 114, and the winding 102 is interposed between the outer wall 113 and the inner wall 114. It is shown that it is wound. A claw 112 is provided on the upper end of the outer wall 113, and a claw 112 is also provided on the insulating cover 109 for scattering prevention.

JP 2002-44896 A

In the invention proposed in Patent Document 1, as described above, the bobbin 108 is firmly fixed by the anti-scattering insulating cover 109 by engaging the nail 112 of the outer wall 113 and the nail 112 of the anti-scattering insulating cover 109. Has been.
However, in the invention proposed in Patent Document 1, as described above, both the bobbin 108 and the anti-scattering insulating cover 109 are made of super engineering plastic. The super engineering plastic is characterized by a low coefficient of thermal expansion compared to copper (Cu), Cu alloy, aluminum (Al), Al alloy and the like used as the winding 102. For this reason, when the electric motor becomes hot while the electric motor is operating, the bobbin 108 and the anti-scattering insulating cover 109 do not expand much, whereas the winding 102 expands greatly. Since the winding 102 is wound between the outer wall 113 and the inner wall 114 of the bobbin 108, when it is thermally expanded, there is a pressing force toward the outside so as to spread the outer wall 113 and the inner wall 114 of the bobbin 108 from the inside. Works.

  As described above, the bobbin 108 described in Patent Document 1 is firmly fixed by the scattering-preventing insulating cover 109, and the outer wall 113 of the bobbin 108 cannot be bent outward in terms of configuration. Accordingly, the pressing force generated by the thermal expansion of the winding 102 acts strongly on the inner wall 114 of the bobbin 108, and an excessive stress is generated in the root portion 114e. As a result, the root portion 114e may be plastically deformed, and there is a concern that the reliability of the electric motor may be reduced.

  The bobbin is often called an insulator bobbin or an insulator, and the anti-scattering insulating cover is often called an insulator cover. Accordingly, in the present invention, the bobbin is referred to as “insulator”, and the anti-scattering insulating cover is referred to as “insulator cover”.

  The present invention has been made in view of the above-described situation, and even when the motor is hot and the windings are thermally expanded, the stator of the motor that can relieve the stress generated at the root portion of the inner wall of the insulator. An object is to provide an electric motor and an air conditioner.

  A stator of an electric motor according to the present invention includes a substantially cylindrical stator core, and a substantially cylindrical insulator provided at at least one opening end of the stator core and having a winding body around which a winding is wound. And an insulator cover fixed to the opening end of the insulator, and the thermal expansion coefficient of the insulator cover is higher than the thermal expansion coefficient of the insulator.

  An electric motor according to the present invention includes a substantially cylindrical stator core, a substantially cylindrical insulator provided at at least one open end of the stator core, and a winding body portion around which a winding is wound, and the insulator An insulator cover fixed to the open end of the stator, a stator having a thermal expansion coefficient higher than that of the insulator, and a rotor that rotates inside or outside the stator. It was set as the structure provided with.

  An air conditioner according to the present invention includes a substantially cylindrical stator core, a substantially cylindrical insulator provided at an opening end of at least one of the stator cores, and having a winding body portion around which a winding is wound, An insulator cover fixed to an opening end of the insulator, a stator having a thermal expansion coefficient higher than that of the insulator, and a rotor rotating inside or outside the stator. And an electric motor equipped with the above.

  The stator, the motor, and the air conditioner of the electric motor according to the present invention can relieve the stress generated at the root portion of the inner wall of the insulator even when the electric motor becomes hot and the windings are thermally expanded.

It is a perspective view of the stator of the electric motor which concerns on one Embodiment of this invention. It is a top view of the stator of the electric motor which concerns on one Embodiment of this invention, and has shown the state in the middle of winding the winding to the winding trunk | drum part of an insulator. It is a schematic diagram which shows an example of a winding system. It is a top view of the stator by which the coil | winding was wound by the winding drum part. It is sectional drawing which shows the one aspect | mode of an insulator and an insulator cover. It is sectional drawing which shows the other aspect of an insulator and an insulator cover. The behavior of the insulator is shown when the thermal expansion coefficient Tc of the insulator cover and the thermal expansion coefficient Tg of the insulator satisfy Tc> Tg. The behavior of the insulator is shown when the thermal expansion coefficient Tc of the insulator cover and the thermal expansion coefficient Tg of the insulator satisfy Tc ≦ Tg. It is a disassembled perspective view which shows an example of the electric motor which concerns on this invention. It is a disassembled perspective view which shows another example of the electric motor which concerns on this invention. It is a partially cutaway view showing an example of an air conditioner according to the present invention. It is principal part sectional drawing of the bobbin by which the coil | winding which concerns on a prior art example was wound. It is a top view which shows a mode that the insulation cover for scattering prevention was removed about the stator of the electric motor which concerns on a prior art example. It is an expansion perspective view of the stator of the electric motor which concerns on a prior art example.

  Hereinafter, a stator (hereinafter simply referred to as “stator”), an electric motor, and an air conditioner according to the present invention will be described in detail with reference to the drawings as appropriate.

[stator]
(Structure of stator)
First, the configuration of the stator will be described. FIG. 1 is a perspective view of a stator 10 according to an embodiment of the present invention.
As shown in FIG. 1, a stator 10 according to the present invention includes a substantially cylindrical stator core 1, a substantially cylindrical insulator 2, and an insulator cover 3.
In the present invention, the insulator 2 is provided with at least one open end 1a of the stator core 1, and includes a winding body 2c (see FIG. 2) around which the winding 4 is wound. FIG. 1 shows a state in which an insulator 2 is also installed at the other opening end 1b of the stator core 1.
The insulator cover 3 is fixed to the opening end 2 f of the insulator 2.

Here, FIG. 2 is a plan view of the stator 10 of the electric motor according to the embodiment of the present invention, and shows a state in the middle of winding the winding 4 around the winding body 2c.
Here, FIG. 2 exemplifies a stator used in a so-called 9-slot concentrated winding motor in which the winding 4 is divided into nine winding body portions 2c and concentratedly wound. In this case, as shown in FIG. 3, the winding 4 is divided into three phases called U-phase, V-phase, and W-phase in terms of characteristics, and a point 12 that connects one end of the winding 4 of that phase is It is called a neutral point (hereinafter referred to as neutral point 12). FIG. 3 is a schematic diagram showing an example of a winding method.

  That is, as shown in FIG. 3, the winding 4 has three U-phase, three V-phases, and three W-phases wound in parallel with respect to the slot 1 d divided into nine, and the neutral point 12 is 3 The structure is generated in several places. The terminal (lead wire 6 (see FIG. 4)) on the opposite side to the neutral point 12 is connected to the power input section.

  Returning to FIG. 2, the description will be continued. As shown in FIG. 2, a slot 1d is called between the adjacent winding drum portions 2c and the winding drum portions 2c, and a slot insulating paper 7 is provided along the shape of the slot 1d. The stator core 1 and the insulator 2 are provided with a coil nozzle passage 9 for passing a coil nozzle 8 that is a part of a winding device that winds the winding 4 around the winding body 2c.

The coil nozzle 8 passes through the coil nozzle passage 9 while guiding the winding 4, and the winding body portion 2 c of the insulator 2 and the slot insulation installed at the open ends 1 a and 1 b (see FIG. 1) of the stator core 1. Circulate around the paper 7 and continue to supply the winding 4. Thereby, the winding 4 can be wound several times on the winding drum portion 2 c and the slot insulating paper 7. One of the winding start terminal and the winding end terminal of the winding 4 is connected to the power input unit as the lead wire 6 (see FIG. 4), and the other is the connection point 5 of each phase.
When the winding 4 has been wound around all nine winding drums 2c, and three U-phase, three V-phases, and three W-phases are formed, as shown in FIG. 2 and FIG. A slight gap is formed. Interphase insulating paper 23 is inserted into the gap to ensure insulation.

  Here, FIG. 5A is a cross-sectional view showing one embodiment of the insulator 2 and the insulator cover 3. As shown in FIG. 5A, the insulator 2 has an inner wall 2a that is equal to or higher than the winding height of the winding 4 on the inner diameter side than the winding drum portion 2c, and is wound on the outer diameter side from the winding drum portion 2c. 4 has an outer wall 2b having a wrapping height of 4 or more. Thereby, the insulator 2 prevents the winding 4 wound around the winding body portion 2c from being collapsed.

  When winding the winding 4 around the winding body 2c, a certain amount of tension is applied to prevent loosening. Therefore, not only the winding body 2c of the insulator 2 but also the inner wall 2a and the outer wall 2b of the insulator 2 (both see FIG. 2 and FIG. 5) are directed outward such that they are spread from the inside to the outside. A pressing force acts.

  As shown in FIG. 4, the winding 4 wound around the winding body portion 2 c is inserted into the lead wire protection tube 41 in order to connect one end of the winding 4 to the external power supply input portion. Insulation is secured. 4 and 5A, the winding 4 inserted into the lead wire protection tube 41 is disposed in the circumferential direction in the space sandwiched between the winding 4 and the insulator cover 3, and the lead wire It is drawn from the line summarizing unit 42 to the power input unit side. On the other hand, the other end of the winding 4 constitutes the neutral point 12 as described above.

  In the present invention, as shown in FIGS. 4 and 5A, a claw portion 2d for fixing the insulator cover 3 is provided on the opening end 2f of the insulator 2, specifically on the outer periphery of the outer wall 2b. Moreover, the insulator cover 3 has the nail | claw fixing | fixed part 31 which fixes the claw part 2d, as shown to FIG. 5A. As shown in FIG. 5A, the claw fixing portion 31 can be a through hole 31a that penetrates and engages the claw portion 2d, but is not limited thereto. For example, an aspect as shown in FIG. 5B can be adopted. FIG. 5B is a cross-sectional view showing another aspect of the insulator 2 and the insulator cover 3. That is, it can also be set as the nail-shaped convex part 31b which can be engaged with the nail | claw part 2d. The insulator cover 3 can be easily and firmly fixed by engaging the claw portion 2d of the insulator 2 with either the through hole 31a or the convex portion 31b.

(The coefficient of thermal expansion of the insulator cover and the coefficient of thermal expansion of the insulator)
Next, the thermal expansion coefficient Tc of the insulator cover 3 and the thermal expansion coefficient Tg of the insulator 2 will be described.
Before describing these thermal expansion coefficients Tc and Tg, the thermal expansion coefficients of the windings, insulators, and insulator covers used in general stators will be described. Many of the windings used for general stators are made of Cu. When the winding is made of Cu, the coefficient of thermal expansion is 1.7 × 10 ⁻⁵ m / ° C. Insulators and insulator covers used for general stators are often made of super engineering plastic (super engineering plastic) in consideration of material strength and insulation. When the insulator and the insulator cover are made of super engineering plastics, the thermal expansion coefficient is, for example, 0.5 × 10 ⁻⁵ m / ° C., although it varies depending on the type of super engineering plastic.

  Therefore, in the case of an electric motor using a general stator, each member of the stator is thermally expanded when the temperature becomes high during actual operation, but the relationship between the winding and the insulator and the insulator cover shows that the insulator and the insulator cover The thermal expansion coefficient of the winding becomes larger than the thermal expansion coefficient. That is, the winding is more likely to thermally expand.

In the present invention, in the stator 10 according to the above-described configuration, the thermal expansion coefficient Tc of the insulator cover 3 is higher than the thermal expansion coefficient Tg of the insulator 2 (Tc> Tg). In the present invention, by doing so, the insulator cover 3 is more easily thermally expanded than the insulator 2 when the electric motor becomes hot. That is, when the electric motor reaches a high temperature, as shown in FIG. 6A, the displacement amount Xc of the insulator cover 3 becomes larger than the displacement amount Xg of the outer wall 2b (Xc> Xg). Therefore, the claw fixing portion 31 of the insulator cover 3 is thermally expanded larger than the outer wall 2b, and the gap 32 can be generated between the through hole 31a of the outer wall 2b. Therefore, even when the winding 4 is thermally expanded, the outer wall 2b can be bent (deformed) to the outside (outward direction of the insulator 2) by the generated gap 32. As a result, the pressing force Fn1 generated by the thermal expansion of the winding 4 is distributed to the inner wall 2a and the outer wall 2b, and the stress acting on the root portion 2e can be reduced, so that plastic deformation and the like can be prevented. It becomes possible. Therefore, the reliability as an electric motor can be improved. The effect of the present invention can be obtained if the difference between the thermal expansion coefficient Tc of the insulator cover 3 and the thermal expansion coefficient Tg of the insulator 2 is 0.1 × 10 ⁻⁵ m / ° C.

  On the other hand, as shown in FIG. 6B, when the thermal expansion coefficient Tc of the insulator cover 3 is the same as or lower than the thermal expansion coefficient Tg of the insulator 2 (Tc ≦ Tg), the displacement amount Xc of the insulator cover 3 and the outer wall 2b The displacement amount Xg is Xc ≦ Tg. Since the insulator 2 has the claw portion 2d fixed to the through hole 31a of the insulator cover 3, the outer wall 2b of the insulator 2 is outside (the outside direction of the insulator 2) even when the electric motor becomes hot and the winding 4 is greatly expanded. ) Can not be bent. Therefore, the pressing force Fn2 generated by the thermal expansion acts on the inner wall 2a that is not fixed to the insulator cover 3. Therefore, the inner wall 2a of the insulator 2 is bent outward (inward direction of the insulator 2), and the stress acting on the root portion 2e is increased, which may cause plastic deformation. Since the pressing force Fn1 shown in FIG. 6A is distributed to the winding drum portion 2c, the inner wall 2a, and the outer wall 2b, the pressing force Fn2 shown in FIG. 6B has a relationship of Fn2> Fn1.

(Modified example of insulator cover and insulator)
The insulator cover 3 and the insulator 2 can exhibit the effects of the present invention as long as the coefficient of thermal expansion is the relationship (Tc> Tg) described above. Therefore, the insulator cover 3 and the insulator 2 may be made of any material as long as the relationship (Tc> Tg) is satisfied. For example, the insulator cover 3 and the insulator 2 can be made of super engineering plastics, respectively. In this case, since the material to be used is appropriate, the stress generated in the root portion 2e of the inner wall 2a of the insulator 2 can be reliably relieved even when the electric motor becomes hot and the winding 4 is thermally expanded. it can.

  Examples of super engineering plastics include polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), liquid crystal polymer resin (LCP), fluororesin, polyether ether ketone (PEEK), amorphous polyarylate (PAR), polysulfone ( PSF), polyethersulfone (PES), polyimide (PI), or the like can be used.

  Even if these super engineering plastics are the same kind of resin, the thermal expansion coefficient can be changed or selected depending on the product grade, the crosslinking rate, the difference in the crosslinking agent, and the like. Therefore, an appropriate resin may be selected from those described above, and the product grade may be variously changed as necessary so that the thermal expansion coefficient satisfies the relationship (Tc> Tg).

(Other variations of insulator cover and insulator)
In the present invention, the insulator cover 3 and the insulator 2 can be configured as follows. That is, the insulator 2 can be made of super engineering plastic, and the insulator cover 3 can be made of general engineering plastic (general engineering plastic). In this case as well, the effects of the present invention can be achieved if the thermal expansion coefficients of the insulator cover 3 and the insulator 2 satisfy the above-described relationship (Tc> Tg). In the case of this aspect, since the insulator cover 3 is made of a general engineering plastic, it can be made cheaper than the case where it is made of a super engineering plastic.

As the super engineering plastic, those described above can be used.
As general-purpose engineering plastics, for example, polybutylene terephthalate (PBT), polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), GF-reinforced polyethylene terephthalate (GF-PET), ultra-high Molecular weight polyethylene (UHPE), syndiotactic polystyrene (SPS), etc. can be used.

  The general-purpose engineering plastics can be changed or selected in accordance with the product grade, the crosslinking rate, the crosslinking agent, etc., even if they are the same type of resin as the above-mentioned super engineering plastics. Therefore, an appropriate resin may be selected from those described above, and the product grade may be variously changed as necessary so that the thermal expansion coefficient satisfies the relationship (Tc> Tg).

(Air conditioning equipment using R32 refrigerant)
The stator 10 according to the present invention described above can be suitably used for a compressor of an air conditioner using an R32 refrigerant. Note that the R32 refrigerant has a higher gas temperature due to the physical properties of the refrigerant, particularly compared to the R410A refrigerant. For this reason, the temperature of the electric motor also increases, and the thermal expansion of each member tends to increase. However, by using the stator 10 according to the present invention, the stress generated in the root portion 2e of the inner wall 2a of the insulator 2 can be relieved even when the electric motor becomes hot and the windings are thermally expanded. Therefore, the reliability as an electric motor can be improved.

[Electric motor]
Next, the electric motor according to the present invention will be described.
FIG. 7A is an exploded perspective view showing an example of an electric motor according to the present invention. FIG. 7B is an exploded perspective view showing another example of the electric motor according to the present invention.

As shown in FIG. 7A, the electric motor 20 </ b> A according to an example of the present invention includes the stator 10, the rotor 21 </ b> A, the first housing 22, and the second housing 23.
Since the stator 10 has already been described, description thereof is omitted here.

  The rotor 21A is provided inside the substantially cylindrical stator 10, and includes a permanent magnet that generates magnetic flux. The rotor 21 </ b> A is supported by bearings provided in the first housing 22 and the second housing 23 so as to be rotatable inside the stator 10.

  The first housing 22 and the second housing 23 are each formed of a metal (preferably a nonmagnetic metal) in a bottomed cylindrical shape. The first housing 22 and the second housing 23 are provided with a stator 10 and a rotor 21A on the inner side of a cylinder, and are coupled by welding, screws, an arbitrary fitting structure, or the like.

  Note that the electric motor 20A having the rotor 21A inside the stator 10 is generally called an inner rotor type electric motor. Since this electric motor 20A has the stator 10, even if the winding 4 is thermally expanded due to actual operation, the stress generated in the root portion 2e of the inner wall 2a of the insulator 2 can be relieved. Can do. Therefore, the reliability as an electric motor can be improved. Further, the electric motor 20A having such a configuration has a feature that the responsiveness is good because the rotor 21A is provided inside the stator 10, and the heat dissipation is good because the coil is on the outside.

Further, as shown in FIG. 7B, an electric motor 20B according to another example of the present invention includes the stator 10, the rotor 21B, the first housing 22, and the second housing 23 described above. ing.
Since the stator 10, the first housing 22 and the second housing 23 have already been described, description thereof will be omitted and the rotor 21B will be mainly described.

  The rotor 21B is provided outside the substantially cylindrical stator 10, and includes a permanent magnet that generates magnetic flux. The rotor 21 </ b> B is supported by bearings provided in the first housing 22 and the second housing 23 so as to be rotatable outside the stator 10.

  The electric motor 20B having the rotor 21B outside the stator 10 is generally called an outer rotor type electric motor. Since this electric motor 20B has the stator 10, even if the winding 4 is thermally expanded due to actual operation, the stress generated in the root portion 2e of the inner wall 2a of the insulator 2 can be relieved. Can do. Therefore, the reliability as an electric motor can be improved. In addition, since the electric motor 20B having such a configuration has the rotor 21B outside the stator 10, a large torque can be easily obtained, and the rotation is stable in the case of constant rotation. Have.

[Air conditioning equipment]
Next, an air conditioner according to the present invention will be described.
FIG. 8 is a partially cutaway view showing an example of an air conditioner (specifically, an outdoor unit) according to the present invention.
As shown in FIG. 8, the air conditioner 30 according to the present invention includes a compressor 25. The compressor 25 includes the above-described electric motor 20A or electric motor 20B. The electric motor 20A and the electric motor 20B include the stator 10 described above. Since the stator 10 has already been described, a description thereof is omitted here.

  The compressor 25 has a function of compressing a gaseous refrigerant during cooling and heating. An example of the refrigerant is the R32 refrigerant described above.

  As described above, the air conditioner 30 includes the electric motor 20 </ b> A or the electric motor 20 </ b> B including the stator 10. For this reason, even when the electric motor becomes hot due to actual operation and the winding 4 is thermally expanded, the stress generated in the root portion 2e of the inner wall 2a of the insulator 2 can be relaxed. Therefore, the reliability as the electric motors 20A and 20B and the air conditioning equipment 30 can be improved.

  As mentioned above, although the stator of the electric motor, the electric motor, and the air conditioner which concern on one Embodiment of this invention were demonstrated in detail, the summary of this invention is not limited to this, Various modifications are included.

  The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  Each of the above-described configurations, functions, processing units, processing means, control means, and the like may be realized by hardware by designing a part or all of them, for example, with an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files that realize each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  Furthermore, the control lines and information lines are those that are considered necessary for the explanation, and not all control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 10 Stator 1 Stator iron core 1a Open end 2 Insulator 2c Winding drum part 2f Open end 3 Insulator cover 4 Winding Tc, Tg Thermal expansion coefficient

Claims (7)

A substantially cylindrical stator core;
A substantially cylindrical insulator provided at at least one opening end of the stator core and provided with a winding drum portion around which a winding is wound;
An insulator cover fixed to the opening end of the insulator, and
The stator of an electric motor, wherein a thermal expansion coefficient of the insulator cover is higher than a thermal expansion coefficient of the insulator. In claim 1,
A stator for an electric motor, wherein the insulator and the insulator cover are made of super engineering plastic. In claim 1,
The insulator is made of super engineering plastic;
A stator for an electric motor, wherein the insulator cover is made of general-purpose engineering plastic. In claim 1,
The opening end of the insulator has a claw for fixing the insulator cover;
The insulator cover includes a claw fixing portion that fixes the claw portion. In any one of Claims 1-3,
A stator for an electric motor, which is used for a compressor of an air conditioner using an R32 refrigerant. A substantially cylindrical stator core;
A substantially cylindrical insulator provided at at least one opening end of the stator core and provided with a winding drum portion around which a winding is wound;
An insulator cover fixed to the opening end of the insulator, and
A stator whose thermal expansion coefficient of the insulator cover is higher than the thermal expansion coefficient of the insulator;
A rotor that rotates inside or outside the stator;
An electric motor comprising: A substantially cylindrical stator core;
A substantially cylindrical insulator provided at at least one opening end of the stator core and provided with a winding drum portion around which a winding is wound;
An insulator cover fixed to the opening end of the insulator, and
A stator whose thermal expansion coefficient of the insulator cover is higher than the thermal expansion coefficient of the insulator;
A rotor that rotates inside or outside the stator;
An air conditioner characterized by having an electric motor equipped with

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