Extended analytic approach to acoustic noise in switched reluctance drives

Frequency domain analysis of the phase voltage waveform of switched reluctance machines operating in single-pulse operation is performed with the aim to reduce acoustic noise. A method to influence the harmonic content of this waveform is derived. As a result pulse patterns optimized for minimal excitation of natural frequencies can be calculated a priori. These pulse patterns are composed of fixed dwell angles and free wheeling angles rather than turn-on or turnoff angles and freewheeling times, as presented in recent other publications. The derived theory is validated by experiments