Analysis of torque ripple reduction in a segmented-rotor synchronous reluctance machine by optimal currents

Abstract

The research about synchronous reluctance machine (SynRM) has been revived in the last decades because of its advantages. But the torque ripple limits the performances of SynRM. Based on the feature of SynRM, this paper proposes a new method in order to calculate the optimal currents which contain many harmonics. Based on the proposed torque function, this method does not use the specific stator inductances to reduce torque ripple. Then, the compensated torques by supplying different orders of optimal currents are compared and analyzed. Besides, the influence of magnetic saturation on the proposed method is also studied. Thirdly, the added current harmonics could increase the losses of the machine. Therefore, the copper losses of the machine are also analyzed. It has shown that the proposed approach can decrease torque ripple effectively.