低温余热磁悬浮发电机转子轴系振动机理研究

Vibration mechanism analysis of magnetic levitation rotor system for low temperature waste heat power generation

采用磁悬浮高速直驱发电设备能够显著地提高低温余热发电系统的效率。以磁悬浮高速永磁发电机为对象,研究磁悬浮转子受到的电磁不平衡拉力及其轴系的径向振动情况。文中综合考虑磁悬浮转子静、动态偏心,结合麦克斯韦应力法与等效磁路法推导了电机不平衡拉力的解析模型,并结合转子质量不平衡激励以及磁悬浮轴承的控制反力研究了转子的振动情况。文中通过计算、仿真及试验对影响不平衡拉力的主要因素进行了详细分析,得到了其与偏心量幅度、发电机转矩角以及转子磁动势与偏心角度的初始相差等多个因素的关系,所得研究结论为抑制磁悬浮发电机转子振动提供了理论依据。

By using high speed maglev generator,the efficiency of low temperature waste heat generation system were improved significantly.The unbalanced magnetic pull(UMP)in the maglev generator caused by dynamic and static eccentricity was calculated theoretically,and the analytical expression of the UMP was obtained based on Maxwell stress tensor method.Then,the vibration of a maglev rotor system under the action of the UMP and the mass unbalance force was analyzed by the numerical method.Lastly,the effects of different eccentricities,torque angles and loads on the rotor vibration were discussed in detail.The conclusions for the maglev rigid rotor system are useful for the future research.