Optimization Design of Electromagnetic Vibration of Permanent Magnet Synchronous Motor Considering Force Modulation

In this paper, the fundamental reason for the influence of stator slot opening width on the amplitude of the equivalent concentrated force (ECF) on the stator teeth is discussed. And the structure parameters of motor are optimized to achieve low electromagnetic vibration by considering the force modulation effect. Firstly, a quantitative analysis is conducted on the higher-order and lower-order electromagnetic force amplitudes with different slot opening widths for a 12slot-l0pole permanent magnet synchronous motor (PMSM). The results show that the increasing opening width leads to an increase in both the higher-order and lower-order electromagnetic force amplitudes. Due to the opposite phase, there is a maximum value of the ECF amplitude on the stator teeth. In addition, structure parameters are optimized to reduce the higher-order electromagnetic force amplitude and increase the lower-order electromagnetic force amplitude, resulting in a decrease in the vibration acceleration amplitude at 2fe. Finally, the modal analysis experiment and vibration acceleration test are conducted on the original prototype. The simulation results have a good agreement with the experiment results, demonstrating the accuracy of the simulation model and the effectiveness of the calculation method.