磁悬浮轴承转子热弯曲振动特性研究

为了研究磁悬浮轴承-转子系统中由于轴颈铁损集中而出现的热弯曲振动现象,根据磁悬浮轴承的工作原理,总结出热弯曲振动的变化规律,并利用Bertotti铁损分离模型得到转子轴颈处的铁损耗,以铁损耗作为热源,结合磁悬浮轴承的支承特性,建立转子热-结构耦合振动方程,求解得到热弯曲振动响应.同时,为了研究转子工作时热弯曲振动的变化...

Characteristics of thermal-bow vibration in an active magnetic bearing supported rotor

The thermal-bow vibration induced by the concentration of the iron loss in an active magnetic bearing(AMB) supported rotor was studied. The changing principle of the thermal-bow vibration was studied according to the working principle of the AMB. The iron loss obtained by the Bertotii’s separation theory was set as the heat source. By combining the support characteristics of AMBs, the thermal-structural vibration equation was established to obtain the thermal-bow vibration. In addition, an iterative calculation method was employed to upgrade the calculation conditions and obtain the vibration response until the vibration converges or diverges. The calculation results show that the overall temperature of the rotor is strongly related to the rotation frequency. The temperature difference at journal circumference is mainly decided by the vibration amplitude. The location of the hot spot and the thermal bow direction are related to the vibration direction, and they determine the changing of the vibration.