A Study on Simple Method of Iron Loss in Switched Reluctance Motor

Abstract

Shingo Inamura, Student Member, Hironori Shibayama, Non-member, Koichiro Sawa, Member (Keio University)With recent remarkable development of power electronic technology, a Switched Reluctance Motor (SRM) has been widely studied for practical use. There still remain some problems to improve, e.g. relatively high torque ripples, electromagnetic noise and iron loss.We have concentrated on iron loss and discussed simple method to estimate it. The analysis of iron loss enables us to know not only total loss but also its distribution, therefore it would be possible to calculate the temperature analysis. A proposed method is based on 2D static Finite Element Analysis(FEA) and loss data given by open circuit test. Eddy current loss is evaluated by the frequency analysis of flux density waveforms using Fourier transform, while hysteresis loss is evaluated by the classification of the waveforms in each position of the magnetic circuit. The total loss and loss distribution are obtained. The validity of this method is verified in comparison with measured values in two types of SRM with different material property.