Twelfth-order Vibration Suppression Strategy for Double-Star PMSM

This letter presents a control strategy to reduce both the 12th order radial force vibration and 12th order torque ripple for double-star permanent magnet synchronous motors. Feeding 12th order harmonic current to suppress the 12th order torque ripple increases the 12th order radial force. Therefore, the 12th order radial force is suppressed via superimposition of a 6th order harmonic current. Experiments were conducted to measure the torque and acceleration of a motor. The outcomes demonstrate the effectiveness of the proposed method. During the experiment, the radial acceleration of the motor was measured instead of the radial force. As a result, the 12th order torque ripple and 12th order radial acceleration are suppressed by 68.8% and 67.7%, respectively.