一种新型磁悬浮飞轮用永磁偏置径向磁轴承

Novel permanent-magnet bias radial magnetic bearing used in magnetical suspended flywheel

针对现有径向磁轴承结构电励磁磁路耦合的特点,分析了一种新型磁悬浮飞轮用永磁偏置径向磁轴承结构及其工作原理。采用等效磁路法对磁轴承的永磁磁路和电励磁磁路进行计算,得出了磁轴承的数学模型,并给出磁轴承主要参数的设计方法。最后,通过有限元法对该磁轴承进行仿真分析,从磁场分布以及x方向通电流时对力Fy的影响两方面验证了该结构电励磁回路在x、y方向间的解耦性,其中Fy<3%Fx。理论研究和仿真分析表明:这种径向磁轴承结构有效地避免了磁通在两个径向自由度间的耦合,从而能够扩大系统线性工作范围和稳定裕度,提高磁轴承系统的控制性能。

According to the defects of a radial hybrid magnetic bearing,the configuration and fundamental principle of a novel permanent-magnet bias radial magnetic bearing were introduced.By using a equivalent magnetic circuit,the flux path was analyzed to deduce the mathematical models of the magnetic bearing,and the parameter design methods were also presented.Finally,the radial magnetic bearing was simulated and calculated by a Finite Element Method(FEM) so as to check the decoupling characteristic of the excitati...