Permanent magnet motor, refrigeration compressor and air conditioning unit

Abstract

A permanent magnet motor, a refrigeration compressor, and an air conditioning unit. A stator (20) and a rotor (30) are mounted in a housing (10) of the permanent magnet motor. An inner cavity of the housing (10) is partitioned to form a first inner cavity (10a) and a second inner cavity (10b). An axial ventilation hole (213) communicated with the first inner cavity (10a) and the second inner cavity (10b) is disposed on a tooth portion (212) of a stator core (21) of the stator (20), and the axial ventilation hole (213) is a taper hole extended along a height direction of the tooth portion (212). The width of one end, close to the head (212a) of the tooth portion, of the axial ventilation hole (213) is greater than the width of one end, close to the root (212b) of the tooth portion, of the axial ventilation hole (213). The taper hole can enable a fluid to fully exchange heat at the tooth portion (212) that generates heat most intensively, and can further enable residual paint in an immersion-painting process to be centralized to a narrow end of the ventilation hole under the action of surface tension, so that a wide end keeps clear.

Description

technical field [0001] The invention relates to a motor, in particular to a permanent magnet motor, a refrigeration compressor with the permanent magnet motor and an air conditioner with the compressor. Background technique [0002] The highest temperature heat during the operation of the permanent magnet motor mainly comes from the stator copper loss and the stator iron loss. The magnetic density of the stator teeth is the largest, and the loss is large, resulting in the highest temperature of the inner surface of the motor stator and the outer surface of the rotor. It is found through experiments and research that since the rotor is composed of permanent magnets, the heating of the rotor can be ignored, so the main reason for the temperature rise of the rotor during the operation of the motor is caused by heat transfer. For permanent magnet motors, there are hidden dangers such as high temperature demagnetization and motor insulation heat loss if the rotor temperature is ...

AI Technical Summary

Problems solved by technology

[0004] In view of the current state of the art above, the technical problem to be solved by the present invention is to provide a permanent magnet motor, which can increase the heat transfer ratio of the motor, so that the heat transfer fluid such as refrigerant can exchange heat at the stator teeth where the motor generates the most heat. In this way, the temperature of the motor can be stably controlled, and the problem of uneven cooling of the permanent magnet motor can be solved

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