Affiliations: [a] School of Electrical Engineering, Shandong University, Jinan, China
Correspondence:
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Corresponding authors: Yunpeng Zhang, School of Electrical Engineering, Shandong University, Jinan 250061, China. E-mail: zhangyp@sdu.edu.cn. Shuqin Liu, School of Electrical Engineering, Shandong University, Jinan 250061, China. E-mail: lshuqin@sdu.edu.cn
Abstract: 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.
Keywords: Hybrid magnetic bearing, permanent magnet position, load capability, equivalent magnetic circuit, finite element method
