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The magnetic properties of permanent magnet in permanent magnet motor can directly affect the efficiency, safety and reliability of permanent magnet motor. If the motor design or improper use, in the high temperature, chemical corrosion, mechanical vibration and impact under the effects of the armature reaction factors such as current, the motor of the permanent magnet is easy to produce irreversible loss of magnetic motor performance fell sharply, and possibly lead to motor stalling or burned. Due to the air motor is facing a lot of poor working conditions, such as vibration and impact caused by mechanical overload, starting or reversal of current overload, and sophisticated atmosphere and temperature conditions, etc., while the air motor and requires a high degree of reliability, therefore permanent magnet motor to get extensive application in aviation, the first thing to solve the problem of loss of permanent magnet motor magnetic. Therefore, it is necessary to analyze the reason of the magnetism of permanent magnet and find out the way to improve the resistance to demagnetization.

Analysis of the cause of demagnetization of permanent magnet motor

The reasons for the loss of magneto in permanent magnet are summarized in the following three conditions:

Material itself causes of excitation-loss of permanent magnetic material thermal stability and time stability, chemical stability, resistance to vibration and stability of the external magnetic field performance is not up to standard is the main reason for the permanent magnet motor caused by loss of permanent magnet magnetic.