中文摘要：

以某电动车驱动用无刷直流电机为研究对象，在ANSYS中通过APDL语言建立了基于铁心内径、铁心外径等参数的定子结构参数化模型，通过模态仿真和计算，得到了相应的模态阵型及振动特性，同时为了获得电机的实际振动特性，在电机NVH测试台架上进行了电机声振测试，试验结果和仿真结果相符，验证了模型的正确性。进而对影响振动特性的因素进行灵敏度分析，以此为依据对定子进行了优化设计。优化后电机定子总成的模态频率整体上有了大幅度的升高，降低了电磁噪声频带范围内的模态密度，振动噪声特性得以改善，且定子体积与质量均减小，达到轻量化目的。

英文摘要：

In this paper, based on one driving permanent magnet brushless DC, the parameterized modal of the stator structure was established with ANSYS on the basis of the inside diameter and outside diameter of the magnet core. Through the model simulation and calculation, the modal shape and vibration characteristics were obtained, and the model was con- firmed by NVH experiment. The stator structure was optimized based on the results of the sensitivity analysis of the factors, which influence the vibration characteristics. According to the theory and simulation, the optimized model has a higher mo- dal frequency and lower modal density in the range of the electromagnetic noise frequency, hence the characteristics of noise and vibration are improved and the total mass is reduced.