摘要：介绍了无轴承电机轴向单自由度主动磁轴承结构和工作原理，阐述了其悬浮力产生原理，导出了轴向悬浮力方程，对轴向主动磁轴承进行了参数设计并给出了计算方法。利用Matlab软件对轴向悬浮力非线性特性进行了分析，给出了仿真图；利用有限元分析软件Ansoft建立了试验样机模型，采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，并进行三维有限元参数化分析得到了轴向力/电流关系曲线。理论研究和有限元分析结果表明：轴向悬浮力具有较好的线性和对称性，有利于控制器及功放电路的简化与设计；轴向磁轴承结构和参数设计合理，所设计的样机能够满足性能要求。
关键词：无轴承电机；单自由度主动磁轴承；参数设计；非线性；有限元分析

Abstract:Based on configuration and working principle of one-degree freedom active magnetic bearing used in the axial direction of bearingless motors，the principle of producing suspension force was expounded. The equation of attraction was also educed.The parameter design and calculating methods for axial magnetic bearing were derived. The nonlinearity relations among axial suspension forces were calculated and analyzed using Matlab software，the figures of simulation were given. The experiment prototype was designed in software Ansoft. The configuration and magnetic path of the experiment prototype were analyzed by using 3D-FEM. The axial force-current curves were derived by 3D parameterization analysis furtherly. The theory research and finite element analysis results have shown that the axial suspension forces have great linearity and symmetrical characteristic strenuously. It is beneficial to simplify and design the controller and the power amplifies. The mechanical structure of the experiment prototype is legitimacy. The methods on parameter design and calculating are operable. The designed axial magnetic bearing prototype satisfied performance requirements.
Key Words:Bearingless motors；One-degree freedom active magnetic bearing；Parameter design；Nonlinearity；FEM