Sealed type electric compressor

Abstract

The present invention provides a sealed type electric compressor capable of ensuring the magnetic force of the motor and improving the magnetic flux force of the Nd-Fe-B type sintered magnet and improving the durability against the high temperature demagnetization. A sealing type electric compressor according to the present invention includes a compression mechanism portion of an R32 refrigerant, and a motor for driving the compression mechanism portion, wherein the rotor of the motor has a permanent magnet and the magnetic force of the permanent magnet is 98.5% or more. The permanent magnet is a permanent magnet that performs an external magnetism, and improves the magnetic force as compared with the conventional permanent magnet. According to the sealed type electric compressor provided with the motor using the permanent magnet, the demagnetization starting current can be raised to a control current or higher, and the thermal durability is excellent.

Description

technical field [0001] The present invention relates to a sealed electric compressor. Background technique [0002] Conventionally, R134a, R410A, R407C, etc. have been used as refrigerants for refrigerators, air conditioners, refrigerators, and the like. These refrigerants have a small impact on the ozone layer, but have a large global warming coefficient. On the other hand, when R32 is compared with R410A, the global warming coefficient is about one-third. However, compared with R134a, R410A, R407C, etc., R32 has a higher discharge temperature in the compressor and may demagnetize the permanent magnet used in the motor. [0003] Patent Document 1 describes a motor in which durability against high-temperature demagnetization is improved by increasing the thickness of a rare-earth magnet compared to normal. [0004] In addition, Patent Document 2 describes a motor in which heat resistance is improved by substituting Dy for a part of Nd in an Nd—Fe—B based sintered magnet. ...

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Problems solved by technology

[0008] However, in the motor of Patent Document 1, since the thickness of the rare-earth magnet is increased, the size of the iron core made of the electromagnetic steel sheet is correspondingly restricted.

Due to the increase of rare-earth magnets in this motor, the volume of the iron core is reduced accordingly, so sufficient magnetic force cannot be ensured.

[0009] In addition, in the motor of Patent Document 2, the saturation magnetic pole of the magnet is reduced, and the necessary residual magnetic flux density cannot be obtained, so sufficient magnetic force cannot be secured.

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