Comparison between single phase and three phase of PWM inverters in Iron Loss measurement

Abstract

The authors have previously proposed two methods for evaluation of the iron loss of the AC filter inductor used in a pulse width modulation (PWM) inverter. The first is a loss map method based on a loss-map of the magnetic materials, which can be used to calculate and predict iron loss without an actual circuit. The other is the inductor loss analyzer (ILA) method, which can be used to directly measure and calculate iron loss for every one-switching in an actual circuit. Effectiveness of both methods was already verified on a single-phase PWM inverter, but has not yet been verified on a three-phase PWM inverter. In this paper, accuracy of the iron loss calculated by the loss map method is verified and it is found that calculation error arises especially in the inductor used in three-phase inverters. The calculation error, however, can be reduced by introducing a revised calculation process of the loss map method.