Analysis of Reducing Vibration and Noise on Switched Reluctance Motor by Slot on the Top of Stator

Due to the great vibration and noise of switched reluctance motor (SRM), its application in many fields is limited. In this paper, a rectangular slot is set on the top of the stator tooth of SRM to change the direction of magnetic distribution to reduce the peak value of radial electromagnetic force at the turn off time of the phase winding by reduce the radial flux density and increase the tangential flux density. Firstly, the air-gap magnetic field is divided into four regions. The method of relative permeance is used to calculate the air-gap permeability before and after slotting to analyzed principle of reducing the radial electromagnetic force. Secondly, the optimal size is obtained by optimizing the width and height of the slot, the results show that although the average torque is reduced by 3.2%, the radial electromagnetic force is reduced by 13.2%. Then vibration frequency response and sound pressure spectrum of two stator models are obtained by multi-physical field analysis, the results show that the vibration displacement, vibration velocity and vibration acceleration of slotted stator are obviously better than ordinary stator. Finally, it is proved by prototype vibration experiment that the slot at the top of stator tooth can reduce the vibration and noise of SRM.