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为了分析牵引电机转子振动对车辆动力学性能的影响,建立了包括驱动系统的动车非线性动力学模型,模型中考虑了转子-轴承系统的非线性力。通过数值仿真,研究了转子-轴承系统非线性反力对牵引电机振动的影响,对比分析了考虑与不考虑转子轴承非线性反力时车辆在驱动、匀速和惰行工况下的动力学特性。结果表明,电机转子的振动是由轴承变刚度频率及其次谐波频率振动引起的。轴承反力对电机、构架和轮对的垂向与纵向高频振动影响较大,横向振动以及车体振动影响较小。转子具有结构偏心时,这种影响更加明显。
In order to analyze the influence of the rotor vibration of the traction motor on the dynamic performance of the vehicle, a nonlinear dynamic model of the vehicle including the drive system is established. The nonlinear force of the rotor-bearing system is taken into account in the model. The influence of the nonlinear reaction force of the rotor-bearing system on the vibration of the traction motor is studied by numerical simulation. The dynamic characteristics of the traction motor under driving, constant speed and idling conditions are compared with and without considering the nonlinear reaction force of the rotor bearing. The results show that the vibration of the motor rotor is caused by the variable stiffness of the bearing and the vibration of the second harmonic frequency. The bearing reaction force has a great influence on the vertical and longitudinal high-frequency vibration of the motor, the frame and the wheelset, and has little influence on the lateral vibration and the vehicle body vibration. Rotor with structural eccentricity, this effect is more obvious.