Permanent magnet synchronous motor and screw compressor equipped with the permanent magnet synchronous motor

Abstract

A permanent magnet synchronous motor and a screw rod compressor provided with the permanent magnet synchronous motor belong to the technical field of motor heat radiation. The permanent magnet synchronous motor comprises a motor shell, a motor rear cover, a motor stator, a motor rotor and a motor shaft, wherein the motor rear cover is mounted at the end part of one end of the motor shell along the length direction; the motor stator is arranged in the cavity of the motor shell; the motor rotor sleeves the motor shaft; the motor rotor is arranged in the cavity of the motor stator and a gap is kept between the motor rotor and the motor stator. The permanent magnet synchronous motor is characterized in that a stator heat radiation shell sleeves the wall body of the periphery of the motor stator; the stator heat radiation shell comprises a shell body and heat radiation sheets; the shell body is annular and the plurality of heat radiation sheets are arranged; the plurality of heat radiation sheets are distributed on the surface of the periphery of the shell body. The permanent magnet synchronous motor has the advantages that the problem that the heat radiation of the stator of the permanent magnet synchronous motor is not good is effectively solved, and power consumption of the motor can be reducedso that the work of the compressor is more stable and the efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of motor heat dissipation, and in particular relates to a permanent magnet synchronous motor, and also relates to a screw compressor equipped with the permanent magnet synchronous motor. Background technique [0002] Due to the advantages of small size, high power factor, large starting torque, good power index, low temperature rise and high overall operating efficiency, permanent magnet synchronous motors have also been widely used in the driving field of compressors in recent years. Compared with traditional motors, the biggest feature of permanent magnet synchronous motors is the use of permanent magnets for excitation on the rotor of the motor, thereby avoiding the excitation loss caused by the magnetic field generated by the excitation current, but this structure also has shortcomings in use: it is necessary to adopt Forced heat dissipation measures are used to take away the heat inside the permanent ma...

AI Technical Summary

Problems solved by technology

Compared with traditional motors, the biggest feature of permanent magnet synchronous motors is the use of permanent magnets for excitation on the rotor of the motor, thereby avoiding the excitation loss caused by the magnetic field generated by the excitation current, but this structure also has shortcomings in use: it is necessary to adopt Forced heat dissipation measures to take away the heat inside the permanent magnet synchronous motor, so as to avoid the demagnetization phenomenon caused by the permanent magnet being in a high temperature environment for a long time

However, for permanent magnet synchronous motors, the airflow noise and power consumption problems of the motor are becoming more and more serious when the frequency conversion operation is performed, especially at high frequency operation. The traditional forced air cooling method is no longer the best heat dissipation solution for permanent magnet motors.

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