Effects of the PWM inverter parameters on the eddy current losses and thermal analysis of the flameproof induction motor

Pulse width modulation (PWM) inverters are widely applied to control motors. It will often increase the eddy current losses in the motors. In this paper, the authors deal with the effects of eddy current losses with amplitude modulation and switching frequency in an induction motor fed by PWM Inverter. The method is employed by a time-stepping finite element analysis (FEA). The FEA model of motor is coupled to an inverter circuit model, in order to analyze the effects of the inverter parameters on the eddy current losses. The temperature rise of flameproof induction motor are analyzed and computed by using finite element method. The temperature distribution of the motor is simulated and the result is analyzed in this paper. An experiment system is built and an experiment of rotor temperature is carried out. It is the foundation of flameproof induction motor for optimal design.