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介绍了一种新颖的三自由度双磁极面磁轴承的基本结构和悬浮力产生机理;用等效磁路法对该磁轴承的磁路进行了推算,导出了其径向、轴向悬浮力数学模型,并对数学模型进行了线性化处理,得出了其径向、轴向位移刚度和电流刚度。详细阐述了这种磁轴承气隙磁感应强度、磁极面积、控制线圈安匝数等参数设计方法以及计算过程,给出了实验样机参数。在有限元分析软件ANSOFT中建立了试验样机模型,并用三维有限元法对试验样机的结构和磁路进行了仿真分析;采用MATLAB软件和三维有限元参数化求解方法分别对样机各自由度之间的运动和电磁耦合性进行了分析。研究结果表明,这种磁轴承机械结构和磁路结构正确合理,参数设计方法可行,所设计的样机能够满足性能要求。
A novel three-DOF dual-pole surface magnetic bearing is introduced. The basic principle and the generation mechanism of the levitation force are introduced. The magnetic circuit of the magnetic bearing is deduced by the equivalent magnetic circuit method, and the radial and axial levitation force Mathematical model, and the mathematical model was linearized, and its radial, axial displacement stiffness and current stiffness. The design method and calculation process of parameters such as air-gap magnetic induction intensity, magnetic pole area, ampere-turns of control coil and so on are elaborated in detail, and the experimental prototype parameters are given. The finite element analysis software ANSOFT was used to establish a prototype model of the prototype. The structure and magnetic circuit of the prototype were simulated by three-dimensional finite element method. The MATLAB software and the three-dimensional finite element method were used respectively to analyze the degrees of freedom The movement and electromagnetic coupling were analyzed. The results show that the mechanical structure and the magnetic circuit structure of the magnetic bearing are correct and reasonable, and the parameter design method is feasible. The designed prototype can meet the performance requirements.