JP4356571B2 - Electric motor manufacturing method, electric motor, and compressor using the same - Google Patents

Description

  The present invention relates to a method of manufacturing an electric motor that is fixed to a metal frame by shrinkage or press fitting, and a compressor using the same.

Conventionally, this type of electric motor for shrinking and fixing to a metal frame has an electric motor stator having a predetermined fitting allowance inserted into a heated metal frame, the metal frame contracts by cooling, and the electric motor stator is It is firmly fixed to the metal frame. In this case, depending on the rigidity of the metal frame and the motor stator, or the fitting allowance for shrinkage, a large force is applied to the core of the motor stator, distortion accompanied by the deformation of the core occurs, and the motor mounting accuracy decreases, There is a risk that the performance will be affected by the efficiency reduction of the motor, and the quality may be affected by rare shorts. Therefore, using a structure in which all or most of the magnetic pole teeth of the motor stator core are not in contact with the frame, the gap between the motor rotor and the motor rotor is uneven due to the deformation of the motor stator. Some of them are prevented from becoming (for example, refer to Patent Document 1).

FIG. 4 shows a conventional electric motor described in Patent Document 1. In FIG. As shown in FIG. 4, the motor includes a motor stator 1, a motor rotor 4, a metal frame 5, and a crankshaft 6.
JP 2001-078375 A

  However, in the conventional configuration, when the electric motor is fixed in a closed container and used in a high-pressure gas atmosphere, the strength of the metallic frame is high, and the distortion applied to the electric motor stator cannot be ignored. . In particular, since the slot portion of the motor stator is deformed, the efficiency of the motor may be reduced and a rare short circuit may occur. In recent years, a compressor using carbon dioxide as a refrigerant has been required, and in order to increase the pressure-resistant design strength of the sealed container, the thickness of the metal frame has also increased. There is a problem that deformation due to distortion causes a reduction in accuracy of motor integration, an effect on performance accompanied by a reduction in efficiency of the motor, or an influence on quality such as a rare short.

  The present invention solves the above-mentioned conventional problems, and by fixing the electric motor to the metal frame by shrinkage fixing or press-fitting, the electric motor stator is deformed due to distortion, reducing the accuracy of electric motor assembly and lowering the efficiency of the electric motor. An object of the present invention is to provide an electric motor that can prevent the influence on the performance accompanying it or the influence on the quality such as a rare short.

  In order to solve the above-described conventional problems, the electric motor according to the present invention is configured such that the caulking fixing portions of the electric motor stator iron plates to be stacked are arranged close to fitting with the metal frame on the outer periphery of the electric motor stator.

  As a result, when the individual iron plates stacked by the motor stator are caulked and fixed, the outer periphery of the motor stator around the caulking portion swells in the radial direction, and the motor stator is closely fixed to the metal frame by the bulge. Therefore, it is possible to reduce the distortion accompanying the deformation of the electric motor stator by reducing shrinkage over the entire circumference of the stator, to improve the accuracy of the electric motor assembly, to prevent the performance of the electric motor from being lowered, and to prevent the occurrence of quality problems.

  The electric motor of the present invention reduces the distortion applied to the electric motor stator due to the shrinkage of the metal frame when the electric motor stator is fixed to the metal frame by shrinking or press-fitting, reducing the accuracy of motor integration and reducing the efficiency of the electric motor. It is possible to prevent the accompanying influence on the performance or the influence on the quality such as a rare short.

In the present invention, the individual iron plates stacked on the motor stator are caulked and fixed, and the caulking portion is disposed near the fitting portion with the metal frame on the outer periphery of the motor stator, and the metal plate on the outer periphery of the motor stator is disposed . Press the motor stator core by pressing one or more protrusions near the mating part with the frame, pressing it into the metal frame of the motor stator, and then pressing the protrusions. The outer diameter dimension of the iron plate near the portion that has been made is enlarged, and the press-fitting can be further strengthened by increasing the fitting allowance to the metal frame.

The second invention uses the motor of the present invention in a compressor to reduce distortion accompanying deformation of the motor stator due to shrinkage fixing or press-fitting, performance with reduced accuracy of motor integration, and reduced efficiency of the motor. It is possible to provide a compressor having high performance and high reliability by preventing the influence on the quality or the influence on the quality such as a rare short.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of an electric motor according to a first embodiment of the present invention, FIG. 2 is a top view of the electric motor stator core, and FIG. 3 is an upper surface and a detailed cross-sectional view of a caulking portion of the electric motor stator core. FIG.

  In FIG. 1, an electric motor stator 1 includes a core part 2 stacked by caulking and fixing core iron plates punched from electromagnetic steel sheets, and a winding part 3 fixed to a slot by an inserter method or a direct winding method. It is configured. As shown in FIG. 2, the caulking portion 7 of the core iron plate on which the motor stator 1 is laminated is disposed near the fitting portion with the metal frame 5 on the outer periphery of the electric motor stator and is caulked and fixed by caulking. The external dimensions of the peripheral motor stator 1 are enlarged. When the electric motor stator 1 is fixed to the metal frame 5 by shrinkage shrinkage, an allowance for shrinkage shrinkage is set in consideration of an increase in the outer diameter of the electric motor stator 1. In the present embodiment, the enlarged outer diameter dimension of the electric motor stator 1 is made equal to the size of the fitting allowance of the shrinkage, thereby minimizing the mating portion, and the distortion accompanying the deformation of the electric motor stator 1. It is possible to prevent the occurrence of an influence on the quality, such as a decrease in the accuracy of motor integration, a decrease in the efficiency of the motor, or a performance such as a rare short.

As shown in FIG. 3 , one or a plurality of convex portions 8 are provided in the vicinity of the caulking portion 7 of the core iron plate on which the electric motor stator 1 is laminated or near the fitting portion with another metal frame 5. After fixing the shrinkage of the electric motor stator 1 to the metal frame 5, the outer diameter dimension around the convex portion 8 of the electric motor stator 1 is expanded by pressing the convex portion 8. In the present embodiment, the outer diameter dimension of the electric motor stator 1 is increased after fixing the shrinkage, thereby increasing the fitting allowance of the electric motor stator 1 to the metal frame 5 and further strengthening the press-fitting. Can do.

(Embodiment 2 )
In the present embodiment, by applying the electric motor of the present invention to a compressor using , for example, carbon dioxide as a refrigerant, distortion accompanying deformation of the electric motor stator due to shrinkage fixing is reduced, and the accuracy of electric motor incorporation is reduced. Thus, it is possible to provide a compressor having high performance and high reliability by preventing the influence on the performance accompanying the reduction in efficiency or the influence on the quality such as rare shorts from occurring.

  As described above, the electric motor according to the present invention or the method for manufacturing the electric motor and the compressor using the electric motor can reduce distortion accompanying deformation of the electric motor stator that is fixed by shrinkage or press-fitting to the metal frame. Therefore, it can be applied not only to the compressor but also to various electric device fixing methods.

Cross section of electric motor according to Embodiment 1 of the present invention Top view of electric motor stator core in Embodiment 1 of the present invention FIG. 3 is a detailed view of a caulking portion of the electric motor stator core according to Embodiment 1 of the present invention. Top view of conventional motor

DESCRIPTION OF SYMBOLS 1 Motor stator 2 Core 3 Winding 4 Motor rotor 5 Metal frame 6 Crankshaft 7 Caulking part 8 Convex part

Claims (3)

A method of manufacturing an electric motor in which a stator of an electric motor is shrink-fitted or press-fitted and fixed to a metal frame, and the individual iron plates stacked by the electric motor stator are caulked and fixed, and the caulked portion is metal on the outer periphery of the electric motor stator. Place near the fitting part with the steel frame, provide a convex part near the fitting part with the metal frame on the outer periphery of the motor stator, and press the convex part after fixing by shrinkage or press fitting Thus, the method of manufacturing the electric motor is characterized in that the fit of the shrinkage fixing or press-fitting fixing is further strengthened. An electric motor manufactured by the manufacturing method according to claim 1. A compressor having the electric motor according to claim 2.

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