Noise and vibration reduction of switched reluctance motor with novel simplified current waveform to reduce force sum variation

In this paper, theoretical strategy and experimental results of a noise and vibration reduction of a switched reluctance motor are presented. The noise and vibration reduction is carried out with a principle to reduce the variation of the sum of radial forces. The variation of a sum of three-phase radial forces of A-phase tooth, B-phase tooth and C-phase tooth is a cause of vibration and acoustic noise. Thus, the variation of the sum of these forces is aimed to be minimized by current profiling. A simple current reference is proposed. In experiment, an improved current regulation method with better response is also introduced. It has been found that significant noise and vibration reductions can be achieved with the proposed current waveform.