The axial and radial load capacity of axial hybrid magnetic bearing (HMB) is critical for the magnetic levitation system. In this paper, the effect of permanent magnet (PM) position on axial and radial magnetic force and stiffness in axial HMB is investigated. Six different configurations are considered and the equivalent magnetic circuits of HMBs for each configuration is built and studied based on the distribution of magnetic field and magnetic leakage. The dependence of axial and radial magnetic force and stiffness on the axial displacement, radial displacement and control current is calculated and investigated for different configurations. To validate the calculated results, the axial and radial magnetic forces for each configuration are simulated by finite element method. A good agreement between the calculated and simulated results validated the proposed magnetic circuit models.

中文翻译：

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永磁体位置对轴向混合磁轴承轴向和径向载荷能力的影响

轴向混合磁轴承（HMB）的轴向和径向负载能力对于磁悬浮系统至关重要。本文研究了永磁（PM）位置对轴向HMB中轴向和径向磁力以及刚度的影响。考虑了六个不同的配置，并根据磁场的分布和漏磁来构建和研究每种配置的HMB等效磁路。计算并研究了不同配置下轴向和径向磁力以及刚度对轴向位移，径向位移和控制电流的依赖性。为了验证计算结果，通过有限元方法模拟了每种配置的轴向和径向磁力。