A study on the reduction of vibration and acoustic noise for switched reluctance motor

A method for reducing the vibration and acoustic noise of switched reluctance motors is proposed. The dominant source of the vibration and acoustic noise is the rapid change of the radial force during commutation, and it is caused by a rapid change of current. When the excitation current is cut off, the radial force suddenly reduces to 0. If the change of current is slow, the vibration and acoustic noise can be reduced. When the current is gradually decreased from a proper angle before the aligned position, the change of current can be controlled. By using this method, it is possible to reduce the vibration and noise. Experimental results show the validity of the proposed method in this paper.