Abstract：The electromagnetic output torque of a permanent magnet synchronous motor (PMSM) has inherent ripples due to rotor flux harmonics, current harmonics and so on. Driving torque ripple brings NVH problems of hub motor- driven vehicles. Torque ripple in a PMSM was qualitatively and quantitatively studied based on theoretical analysis and test data. The no-load back-electromotive force (EMF) of the motor was firstly measured through a drum towing test to determine rotor magnetic field distribution and rotor flux coefficient. 3-phase load current signals of the motor were measured through a motor driven drum test to find rich harmonics existing in current, and determine harmonics’ amplitudes and initial phases. Electromagnetic torque expression in analytical form was derived based on rotor flux harmonics and current ones. The order source of torque ripple was analyzed, and each order’s amplitude was predicted according to the law of current harmonics’ amplitudes and phases to determine contributions of rotor flux harmonics and current ones to torque ripple. Finally, the actually measured vibration acceleration signals were used to indirectly verify the correctness of torque ripple order analysis and amplitude prediction. The full view and source of hub motor’s torque ripple were analyzed with theory and tests here, the results provided a reference for optimal vibration control of hub motor driven vehicles.
毛钰 左曙光 邓文哲 曹佳楠. 基于实测相电流的永磁同步电机转矩波动阶次来源分析及幅值预测[J]. 振动与冲击, 2018, 37(15): 239-245.
MAO Yu, ZUO Shuguang, DENG Wenzhe, CAO Jianan. Order analysis and amplitude prediction of torque ripple in hub permanent magnet synchronous motors based on measured phase current. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(15): 239-245.
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