轴向磁化永磁轴承的刚度特性分析

Analysis on Stiffness of Permanent Magnetic Bearing

利用永磁体等效电流模型,以轴向磁化的永磁轴承为对象建立了刚度矩阵,通过无量纲化,分析了各个尺寸参数对刚度的影响规律,并绘制了相应的变化曲线图,分析结果表明:在轴向力和径向刚度分析中,当R/a>3时,磁环外径作为弱影响参数可以被省略;在倾斜刚度和耦合刚度分析中,外径的影响规律不能被忽略;当磁环的高度和厚度相等时,永磁轴承性能最优。

By using the equivalent electricity model and taking the permanent magnetic bearing in axial magnetizing as the object,the stiffness matrix has been built.Through the dimensionless method,the analysis of the law about the impact of various size parameters on the stiffness has been done and the corresponding graphs have been drawn.The results show that in the analysis of the axial and radial stiffness,when R/a3,the ring diameter as a weak effect parameter can be omitted;when analyzing tilt stiffness and coupling stiffness,the influencing law of the diameter can not be ignored;When the height and thickness of the ring are equal,the permanent magnet bearing has the optimum function.