Analysis and reduction of vibration of switched reluctance motor drives in voltage pulse width modulation mode

This paper describes the results of an experimental investigation into the origin and reduction of stator radial vibration of switched reluctance motor (SRM) drives in voltage pulse width modulation (PWM) mode. The experimental results in time domain analysis combined with frequency domain analysis reveal the stator radial vibration of SRM in voltage PWM mode is initiated not only by the phase current turn-off at the commutation position but also by phase voltage PWM during chopping. The validation and limitation of existing two stage commutation method for the reduction of vibration in SRM with voltage PWM is analyzed based on experimental results. The vibration produced by SRM with voltage PWM during chopping can be reduced using the two stage commutation method, but it is not useful for higher chopping frequency or lower natural frequency. The paper examines the impact of operating parameters and current-reflowing means on the vibration of SRM in voltage PWM mode, several particular principles for restrain the vibration of SRM are outlined based on experimental research.