High-speed switched reluctance machine: natural frequency calculation and acoustic noise prediction

Abstract

In this study, an analytical model is proposed for natural frequency calculation and acoustic noise predictionfor high speed switched reluctance machines. The developed natural frequency model results are compared with themechanical finite element analysis results in terms of 6 different mode shapes that cause the majority of the acousticnoise in switched reluctance machines. The results show that the analytical results are consistent with the numericalmethod results with minimum 90% matching. Based on the natural frequency calculation model, a new acoustic noiseprediction method is developed that only needs a radial force waveform as an input emerging on stator pole surfaces.The comparison of the developed and the numerical results clearly indicates that the acoustic noise level of the switchedreluctance machine can be effectively found during the design process without using time-consuming numerical methods.