A New Structure for Permanent-Magnet-Biased Axial Hybrid Magnetic Bearings

作者：Jiancheng Fang; Jinji Sun^*; Yanliang Xu; Xi Wang

来源：IEEE Transactions on Magnetics, 2009, 45(12): 5319-5325.

DOI：10.1109/TMAG.2009.2024687

• Axial hybrid magnetic bearing
• equivalent magnetic circuit
• FEM analysis
• permanent magnet biased
• reaction flywheel

We propose a new structure for a permanent-magnet-biased axial hybrid magnetic bearing. Starting with the inner air gap and the outer air gap of conventional axial magnetic bearings, we first construct a novel air gap between the permanent magnet and the outer housing, which we call the second air gap, separating the bias flux paths from the control flux paths. As a result, the control flux paths will have lower reluctance, and the power loss of the axial magnetic bearing will be lower. Next, we modeled this axial hybrid magnetic bearing and analyzed it using the equivalent magnetic circuit method, 2-D finite element method (FEM), and 3-D FEM. We have designed and assembled an axial hybrid magnetic bearing prototype for a reaction flywheel system with angular momentum of 15 N.m.s at a speed of 5000 r/min. The theoretical analysis and the prototype experiments show such advantages as simple structure, good force current and force displacement, and high operating reliability.

• 出版日期2009-12
• 单位北京航空航天大学; 山东大学