鼠笼转子端部扭振特性研究及其对结构可靠性影响

针对变频器驱动下牵引电机受到谐波转矩的影响,分析了谐波转矩对铜条式鼠笼转子结构的作用机理。采用试验与仿真相结合的方法识别鼠笼转子端部特性。首先,通过模态分析,获取了鼠笼转子的模态参数;然后,建立了基于模态试验的转子等效有限元模型,分析了其在12倍频特征电磁激励下的静强度及谐响应。最后,基于导条振动测试平台,研究了鼠笼转子端部扭振特性,并对载荷放大效应进行了验证,为提升铜条式鼠笼转子端部结构的可靠性提供了一定的理论支撑。

Research on Torsional Vibration Characteristics of Squirrel Cage Rotor End and Its Influence on Structural Reliability

In view of the impact of harmonic torque on traction motors driven by frequency converters, the mechanism of harmonic torque on the copper squirrel cage rotor structure is analyzed. A combination of experimental and simulation methods is used in order to identify the characteristics at the rotor end of the squirrel cage. Firstly, modal analysis is conducted to obtain the modal parameters of the squirrel cage rotor. Then, a finite element model of the squirrel cage rotor based on the modal tests is established, and its static strength and harmonic dynamic response under 12 times of frequency-induced electromagnetic excitation are simulated and analyzed. Finally, based on the guide bar vibration test platform, the torsional vibration characteristics of the squirrel cage rotor end are investigated and the load amplification effect is verified, which provides certain theoretical support for improving the structural reliability of the copper squirrel cage rotor end.