Research Of Iron Loss And Heat Analysis For Switched Reluctance Motor

Switched reluctance motor (SRM) has a double salient construction and its working principle is different from traditional AC electrical machines. Analysis for magnetic field of SRM is very complicated since the flux waveforms in different parts of the motor vary with motor phase, stator pole and rotor number, also with the winding connections, etc, which results in the SRM losses, especially iron loss calculation difficult.The temperature analysis due to the losses has become a study hot spot. However, research on iron loss and heat analysis for SRM is not in-depth.The conventional iron loss calculation is based on empirical formula and the work about temperature analysis especially transient heat analysis is not enough domestic. So this paper aims at academic research and practice of SRM losses and temperature rise.Firstly, SRM magnetic field analysis is performed to get the flux density waveforms in motor core. Based on the magnetic field data, this paper presents a double-frequency method to separate eddy current lossand hysteresis loss from iron loss, then different methods are used to calculate the two losses separately. Finally, after calculating iron loss and copper loss with the magnetic field analysis, use it as a heat source, and conduct a non-stationary analysis independently with the three dimensional thermal analysis which concentrates on the effect of the heat transfer coefficient on the temperature rise.In this paper, a bipolar switched reluctance machine system model is also established with an H bridge converter as its power circuit topology.