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中文摘要：
采用3D有限元方法,计算磁力轴承转子系统临界转速并分析振动模态,利用磁悬浮转子系统自身悬浮特性进行激振实验,确定有限元模型中磁力轴承支承刚度,有限元法计算的临界转速与转子系统实际运行临界转速相一致。研究表明,磁力轴承刚度对转子临界转速影响很大,可以通过改变磁力轴承刚度和转子材料来调整临界转速;为了避免转子超越弯曲模态的临界转速,转子轴伸长度应控制在安全范围内。
英文摘要：
A 3D finite element analysis（FEA） is used to establish the critical speed and vibration mode of the magnetic bearing-rotor system of high-speed motor.Also,the bearing stiffness of 3D-FEA model was determined using vibration experiment according to the suspension characteristics of the magnetic bearing system.The critical speeds calculated using FEA are consistent with actual results of the rotor system.The study shows that the bearing stiffness has significant impact on the critical speed of rotor.The critical speed can be adjusted by changing bearing stiffness and material properties.The shaft extension should be maintained at a safe range in order to avoid critical speed at rotor bending modes.
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