Core losses measurement technique for high frequency and flux density of switched reluctance machines

The accurate prediction of core loss play an important role in improving switched reluctance motor (SRM) performance. However, the calculation of iron losses in SRM is especially complex because the flux waveforms are non-sinusoidal. This paper describes a core loss measurement method which comprises core loss model based on finite-element analysis to determine flux waveforms and measurement technique to calculate core loss rates in high-speed switched-reluctance machines. The core loss density of different parts was compared with the loss data supplied by lamination steel manufacturers and evaluated in dynamic experiment. The method was applied to a 30 kW, three-phase 6/4 SRM, and the calculated results were compared with experimentally obtained measurements.