中文摘要：

介绍了一种新颖的交直流径向一轴向混合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，导出了其轴向、径向悬浮力数学模型，设计了实验样机参数。利用Matlab软件对磁轴承轴向、径向悬浮力非线性和各自由度之间在平衡位置附近运动、磁路之间的相关耦合特性进行了计算分析，给出了仿真图。研究结果表明：这种磁轴承结构合理紧凑，效率高；磁轴承轴向、径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，并获得良好的控制性能；各自由度运动和磁路几乎没有耦合，采用分散独立的PID控制器实现了磁轴承的稳定工作。

英文摘要：

The configuration and producing magnetic suspension forces of a novel AC-DC radial-axial hybrid magnetic bearing （HMB） are introduced. The flux path is calculated by using equivalent magnetic circuits, and the mathematic models of the axial and radial magnetic suspension forces are deduced. The experiment prototype of the novel bearing is designed. The nonlinearity relations among axial and radial suspension forces and the coupling characteristics of movement and magnetic circuits between axial and radial around balanceable position are calculated and analyzed by Matlab software. Also the figures of simulation are given. The research results have shown that the configuration of the magnetic bearing reduces overall system size, and has high efficiency. The axial and radial suspension forces have great linearity. The symmetrical characteristic strenuously, and movement of every degree of freedom around balanceable po- sition has no coupling and the control flux of every degree of freedom is independent. It is beneficial to simplify and design the controller and the circuit power amplifier. The magnetic bearings operate stably with decentralized PID controllers.