被动永磁悬浮轴承在立式高速离心鼓风机中的应用研究

Applied Research on Passive Oermanent Magnetic Suspension Bearings in Vertical High-speed Centrifugal Blowers

以110kW/24000rpm被动磁悬浮高速离心鼓风机为研究对象,对永磁轴承的磁环尺寸进行优化,设计出一种永磁悬浮轴承的结构。而后对转子系统进行稳定性分析,利用有限元分析法对转子系统的固有频率和振型进行求解。搭建整机试验台,对样机进行空载和负载试验,结合两次案例总结永磁轴承损坏的可能原因,对永磁轴承涡流损耗和空气摩擦损耗分别进行求解分析,得出永磁轴承在高转速下空气摩擦产生了较高的温升使永磁环退磁失效的结论,基于此提出改进方案改善永磁轴承的冷却性能,永磁悬浮轴承有望完全替代主动磁悬浮轴承,为被动磁轴承的产业化提供一些有益的理论支撑。

Taking the 110 kW/24000 rpm passive magnetic suspension high-speed centrifugal blower as the research object,the size of the magnetic ring of the permanent magnetic bearing is optimized,and a structure of the permanent magnetic bearing is designed.Then the stability of the rotor system is analyzed,and the natural frequency and vibration mode of the rotor system are solved by the finite element analysis method.Set up a complete machine test bench,conduct no-load and load tests on the prototype,combine the two cases to summarize the possible causes of permanent magnetic bearing damage,and analyze and analyze the eddy current loss and air friction loss of the permanent magnetic bearing.It is concluded that the high temperature rise caused by the air friction at the rotating speed makes the permanent magnet ring demagnetization failure.Based on this,an improvement plan is proposed to improve the cooling performance of the permanent magnet bearing.The permanent magnet suspension bearing is expected to completely replace the active magnetic suspension bearing,which is the industrialization of passive magnetic bearings Provide some useful theoretical support.