Investigation of electromagnetic vibration of permanent magnet brushless machines

In this paper, a method for predicting the electromagnetic vibration of PM brushless motors is presented. It has accounted for both PM blushless AC and DC motors. It calculates the electromagnetic force on individual stator teeth by the Maxwell stress method, based on 2-D finite element analysis of the electromagnetic field. The resulting radial force contour is then used in an analytical mechanical model to predict the stator vibration. The method gas been validated experimentally, and has been used to investigate the vibration in various PM brushless AC and DC motors.