转子故障对于感应电机来说，通常指断条故障，而对于永磁同步电机来说，一般

Rotor faults usually refer to broken bar faults for induction motors, and permanent magnet demagnetization faults for permanent magnet synchronous motors. The permanent magnet material used to make the permanent magnet synchronous motor has a low Curie temperature, poor temperature stability, and high temperature coefficient. Therefore, when the external magnetic field is switched, the permanent magnet will be demagnetized especially under the condition of excessive temperature. Since the magnetic circuit of the motor is symmetrical, the demagnetization magnetomotive force generated by the stator current will act on all the magnetic poles. Therefore, when a demagnetization fault occurs in a permanent magnet synchronous motor, it generally shows that all the magnetic poles are demagnetized. Problems such as the manufacturing process of the motor, motor overload, armature adverse reactions, and motor temperature are too high can cause such failures. Problems such as the instability of the motor speed and torque, the vibration generated during the operation, and the excessive operation noise are the failure phenomena of the demagnetization failure of the permanent magnet.

Rotor failure for induction motors, usually refers to the fault bar fault, and for permanent magnetic synchronous motor, generally refers to the permanent magnet de-magnetic failure. The permanent magnet material used to make permanent magnet synchronous motors is low in temperature, poor temperature constant and high temperature coefficient. Therefore, when the external magnetic field is converted, especially at high temperatures, the permanent magnet demagnetizes. Because the magnetic circuit of the motor is symmetrical, the demagnetization dynamic generated by the stator current will act on all the magnetic poles, so when the permanent magnetic synchronous motor has a demagnetization failure, it is generally shown as all the magnetic pole demagnetization. The production process of the motor, the overload of the motor, the adverse reaction son of the armature, and the high temperature of the motor can all cause such failures. The problems of motor speed, instability of torque, vibration in operation process and excessive running noise are the fault of permanent magnet demagnet de-magnetic failure.

Rotor fault is usually referred to as broken bar fault for induction motor and demagnetization fault for permanent magnet synchronous motor. The Curie temperature, temperature constancy and temperature coefficient of the permanent magnet used to make PMSM are low. Therefore, when the external magnetic field changes, especially when the temperature is too high, it will cause demagnetization of permanent magnet. Because the magnetic circuit of the motor is symmetrical, the demagnetization electromotive force generated by the stator current will act on all the poles, so when the demagnetization fault occurs in permanent magnet synchronous motor, the demagnetization of all the poles is generally manifested. Such faults can be caused by motor manufacturing process, motor overload, armature adverse reactions and high motor temperature. The instability of motor speed and torque, vibration during operation and excessive operation noise are the failure phenomena of permanent magnet demagnetization.<br>