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提出了一种5自由度混合磁轴承支承高速电机系统,由径向2自由度混合磁轴承、径向-轴向3自由度混合磁轴承和高速电机构成。2自由度磁轴承定子采用8极结构,4个是控制磁极,4个是嵌入永磁体的永磁磁极。3自由度混合磁轴承集成了径向和轴向轴承功能,采用径向充磁的环形永磁体提供径向和轴向磁轴承偏置磁场。文中介绍了混合磁轴承的结构和工作原理,导出了磁轴承的数学模型,给出了详细的参数设计方法,最后采用MAXWELL电磁场有限元分析软件对磁轴承的磁路和主轴受力情况进行了分析。理论研究和有限元分析表明:这种5自由度磁轴承系统结构参数设计合理。
A high-speed 5-DOF magnetic bearing system is proposed. It consists of a radial 2-DOF hybrid magnetic bearing, a radial-axial 3-DOF hybrid magnetic bearing and a high-speed motor. The two-degree-of-freedom magnetic bearing stator has an 8-pole structure, four control poles, and four permanent magnet poles embedded in a permanent magnet. The 3-DOF hybrid magnetic bearing incorporates radial and axial bearing functions. Radial and axial magnetic bearing bias magnetic fields are provided by radial magnetized toroidal permanent magnets. In this paper, the structure and working principle of the hybrid magnetic bearing are introduced. The mathematical model of the magnetic bearing is derived and the detailed parameter design method is given. Finally, the magnetic circuit and spindle stress of the magnetic bearing are analyzed using MAXWELL finite element analysis software analysis. Theoretical research and finite element analysis show that the structural parameters of this 5-DOF magnetic bearing system are well designed.