A Method for Vibration Alleviation of SRM When Demagnetization Voltage is Boosted

This paper concentrates on vibration reduction of switched reluctance motor while phases are demagnetized by a boosted voltage compared to magnetization voltage. Three different methods are investigated in this paper, first method is the conventional method based on Asymmetrical H-Bridge converter providing fixed voltage in both magnetization and demagnetization instances. Second method is when demagnetization voltage is boosted compared to magnetization voltage but conventional control algorithm is used and it is shown that in this condition, the vibration intensity is too high. Third method uses a control algorithm to impose the boosted demagnetization voltage in a way that reduces vibrartion intensity of stator's frame. For all three methods firstly an electromagnetic finite element analysis is used to obtain radial forces and these forces are passed through motor's vibration transfer function and vibration waveforms are obtained. Finally a comparison between vibration response of these three methods is done.