Abstract: When accelerating to 60~100 km/h, a high-frequency whine problem occur in an electric pickup truck. For motor excitation source, the structure and manufacturing process are deeply analyzed in this paper, and the influence of magnetic block flux tolerance, rotor thickness and rotor manufacturing technology on motor whine is studied. For the vehicle transmission path, the influence on motor whine of drive shaft mode and motor end cover mode is analyzed by finite element method and experimental modal method. Finally, by improving frequence of motor end cover mode, adding sound-absorbing paper to drive shaft tube and improving the manufacturing process of rotor, the 48th order motor noise in vehicle is optimized by 6~10 dB(A), which effectively solves the motor whine problem of the electric pickup truck.

Key words: Electric pickup truck; Permanent magnet synchronous motor; Motor whine; Drive shaft mode; Rotor manufacturing technology

摘要： 某电动皮卡车在加速至 60～100 km/h 时，车内存在高频啸叫问题。针对电机激励源， 文章深入分析电机结构及制造过程，采用台架试验法研究制造过程参数磁块磁通量公差、转 子叠压厚度、转子生产工艺对电机啸叫的影响。针对整车传递路径，采用有限元法分析传动 轴模态，模态试验法测试电机端盖模态，并确定其对电机啸叫的影响。最后，通过端盖模态 提升、传动轴轴管加吸音纸、改进电机转子生产工艺，将车内电机 48 阶啸叫噪声总体优化了 6～10 dB(A)，有效解决了电动皮卡电机啸叫问题。

关键词: 电动皮卡；永磁同步电机；电机啸叫；传动轴模态；转子生产工艺