在集中驱动的电动汽车中，电机是电动汽车振动和车内外噪声的主要源头之一。因此，设计人员都期望于在设计阶段能对电机的振动噪声性能进行分析。本文基于电磁场分析理论对电动汽车驱动用永磁直流无刷电机径向力波进行了有限元仿真计算，进而对电机定子进行了动力学建模与仿真研究，实现了车用定子振动动力学特性分析。仿真结果与电机振动试验结果相符，验证了分析的正确性，为进一步实现低噪声驱动电机的优化设计打下了基础。

Motor is one of the main sources of vibration and internal and external noise in the electric vehicles（EV）. Therefore, designers are expected to can predict vibration and noise performance in the design stage of motor. Based on the finite element analysis of electromagnetic field theory, the radial force wave of permanent magnet brushless dc motor used in vehicle is studied by simulation and calculation；Then a dynamics model of motor stator is discussed by stimulation, which achieves the goals to analysis the vibration of motor stator. The simulation results are proved by motor vibration experiment results, which verify the correctness of the analysis and lay a foundation for optimization design of the low noise motor in the future.