中文摘要：

研究了一种永磁偏置轴向磁轴承，分析了结构和工作原理；利用等效磁路法进行分析，提出了利用控制磁通漏磁系数来计算内外磁极面积的方法，得出了轴向悬浮力的数学模型，并对数学模型进行了线性化处理，得出其位移刚度和电流刚度。给出了主要参数的设计方法，给出了样机参数，用有限元对样机进行了电磁场仿真验算。理论研究和仿真分析表明：该永磁偏置轴向磁轴承结构紧凑，控制方便；参数设计方法合理准确，消除了该型磁轴承由于结构原因所导致的内外轴向气隙磁密的差异。

英文摘要：

A permanent magnet bias axial magnetic bearing （PMAB） was introduced, and the configuration and fundamental principle were analyzed. The way of designing inner -outer magnetic pole area by using control flux leakage coefficients was introduced based on equivalent magnetic circuit. The math expression of axial suspension force and some equations for carrying capacity, current stiffness and displacement stiffness were deduced. The parameters design of the innovated magnetic bearing were presented. The parameters of the proposed prototype were also given. The magnetic field simulation was performed by using the finite element software. The theory analysis and the simulation show that the axial radial magnetic bearing is compact in structure, easy to be controlled. The difference of inner-outer axial gap flux density are eliminated for its accurate and feasible parameters design methods.