Motor-driven compressor

Abstract

A motor-driven compressor includes a housing made of a metal material, a compression portion, an electric motor, and a cover. The compression portion and the electric motor are accommodated in the housing, and the cover is attached to the housing. The cover is formed by a plastic portion and a shield made of a metal material that intercepts electromagnetic noise. A motor drive circuit for driving the electric motor is accommodated in an accommodation space defined by the housing and the cover. An elastic sealing member is located between the housing and the cover. The shield includes an extended portion that extends toward the housing and is arranged inside the sealing member. The extended portion is in contact with the housing.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a motor-driven compressor.[0002]A motor-driven compressor includes a housing made of a metal material, which accommodates a compression portion that compresses refrigerant and an electric motor that drives the compression portion. A cover is attached to the housing. The cover defines an accommodation space in which a motor drive circuit for driving the electric motor is accommodated. A sealing member is located between the housing and the cover. The sealing member prevents wastes or water from entering the accommodation space through an interface between the housing and the cover.[0003]When the cover is made of a metal material, the weight of the motor-driven compressor itself becomes heavy. In this regard, a cover made of plastic has been proposed to reduce the weight of the cover to reduce the weight of the motor-driven compressor itself. When a cover made of plastic is used, however, noise from the outside of the m...

AI Technical Summary

Benefits of technology

[0007]It is an object of the present invention to provide a motor-driven compressor that reduces noise leakage though a sealing member and has an excellent cooling performance for a motor drive circuit.

Problems solved by technology

When the cover is made of a metal material, the weight of the motor-driven compressor itself becomes heavy.

When a cover made of plastic is used, however, noise from the outside of the motor-driven compressor is likely to enter the motor drive circuit through the cover.

Also, the noise from the motor drive circuit is likely to leak outside through the cover.

In the compressor disclosed in the above publication, however, even if the inverter case (cover) with the body made of plastic in which the metal plating is performed on the inner side of the body is adopted, noise from the outside is likely to enter the accommodation space through the sealing member to flow through the motor drive circuit.

Also, the noise from the motor drive circuit is likely to leak outside through the sealing member.

As a result, cooling performance of the motor drive circuit accommodated in the accommodation space is reduced.

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