Analysis of Influence of Permanent Magnet Demagnetization on Motor Temperature Rise

Permanent magnet (PM) motors have high power density and difficult heat dissipation, especially when the PMs have demagnetization faults, which will increase the temperature rise of the motors. In this paper, the magneto-thermal coupling simulation analysis of the PM motor is carried out by the finite volume method, and the influence of different demagnetization degrees of PM demagnetization on the temperature rise of the motor is studied. The simulation results show that as the degree of demagnetization increases, the temperature rise of the motor increases significantly. If the temperature of the PM reaches the maximum working temperature, the demagnetization of the PM will continue all the time.