Torque Ripple Analysis and Reduction of Interior Permanent Magnet Synchronous Motors

Interior permanent magnet synchronous motors (IPMSMs) have some inherent disadvantages, such as high torque ripple and difficulty in optimizing design due to the complex rotor structure. To address these issues, this paper proposes a method for optimizing the rotor structure of IPMSMs to reduce torque ripple. The flux barriers in the rotor are abstracted as virtual slots, and the effect of the position of the virtual slots on torque ripple is studied. Based on this analysis, a general method for optimizing the rotor structure to reduce torque ripple is proposed. To demonstrate the proposed method's effectiveness, the original prototype's rotor structure is optimized using the proposed method. The electromagnetic performance of the prototype before and after optimization is calculated. The results show that the optimization can reduce the torque ripple without affecting other electromagnetic performance. Finally, the theoretical analysis and simulation results are validated by conducting a prototype test, which provides support for the proposed method of torque ripple reduction.