交流混合型磁轴承磁场及悬浮力特性分析

Magnetic Field and Characteristic Analysis of Suspension Forces for Radial AC Hybrid Magnetic Bearing

对交流混合型磁轴承的组成结构和基本工作原理进行了介绍,并针对该交流混合型磁轴承的悬浮力进行了数学模型的建立,而且通过泰勒公式近似获得其线性模型。文中创建了该磁轴承的实体模型,利用Ansoft软件仿真并分析了该交流磁轴承的磁通分布状况(气隙及磁极内部);采用Ansoft分析软件与MATLAB软件对交流磁轴承悬浮力的非线性变化规律进行了计算分析。仿真结果表明:磁通密度的分布在磁轴承中,其仿真值和理论设计值几乎吻合,说明该磁轴承计算设计的参数有效;基于数学模型和有限元实体模型的交流混合型磁轴承特性分析结果一致,表明该磁轴承的数学模型建立正确,逼近磁轴承实际工作情况下的模型。

Configuration and operation principle of the radial AC hybrid magnetic bearing （AC HMB） were introduced, the mathematical models of suspension forces were deduced with the method of equivalent magnetic circuits, and the linearity models about the equilibrium position were obtained by using their Taylor expansions. Based on the establishment of finite element solid models of the magnetic bearing in Ansoft finite element analysis software, the magnetic field distributions in air gap and magnetic pole of the AC HMB were calculated. The nonlinear variation of suspension forces of the magnetic bearing was calculated with Ansoft finite element and MATLAB software respectively. The simulation results show that the magnetic field distribution in magnetic bearing is consistent with the theoretical design, and the designing of structural parameters is reasonable. Results also show that the characteristic analysis results based on the mathematical models and fi- nite element solid models of the AC HMB are consistent, and the mathematical model is proved correct, which is close to the model of the magnetic bearing under actual conditions.