Resistive loss identification of an inverter-fed deep-bar induction motor

This paper deals with the resistive losses in the deep-bar induction motor fed by a PWM inverter. The effect of harmonics from the inverter on the resistive losses of the induction motor is investigated by varying the amplitude or phase of the harmonics. The investigation is performed on 45 kW and 1250 kW induction motors. The equivalent circuit of the deep-bar induction motor is presented and used to calculate the resistive losses of motor. The data for estimating the equivalent circuit of the deep-bar induction motor 45 kW is produced by two-dimensional time-stepping finite element analysis (FEA) via an impulse test. The accurate equivalent circuit is suitable for calculating the resistive losses at different frequencies.