Two simplified methods for the iron losses prediction in soft magnetic materials supplied by PWM inverter

Abstract

The aim of this work is to propose a mathematical model for the iron losses prediction in soft magnetic materials with any supply voltage. The starting point for the analysis is the knowledge of the iron losses with sinusoidal supply. The model is based on the separation of the losses contributions due to hysteresis, eddy current and excess losses with sinusoidal supply. Since any contribution depends on the supply voltage characteristics, it is possible to find a direct mathematical relationship between the iron losses contribution and the supply voltage characteristics. As a consequence, an iron losses prediction can be obtained with any supply voltage applied to the magnetic material. Finally, the experimental proofs of the proposed methods are reported.