Abstract：A new permanent magnet biased radial magnetic bearing is proposed. The control flux passes through the second air gap. The magnetic bearing has four stator pole pieces compared to the heteropolar bearing which has eight stator pole pieces, so the new magnetic bearing can reduce the eddy loss three times. The radial magnetic bearing is analyzed and calculated by using equivalent magnetic circuit and 3D finite element method (FEM). The math expression and some equations are given for maximum carrying capacity, current stiffness and displacement stiffness. Some parameters design and calculation method are presented. The theory analysis and simulation show that this radial magnetic bearing is of little displacement stiffness produced by permanent magnet by means of designing the second air gap. It is useful to reduce perturbance, the stiction torque and improve control accuracy of reaction flywheels. It has wide application in bearingless motor, other flywheel systems, and so on.
孙津济, 房建成, 王曦, 杨磊, 王春娥. 一种新型结构的永磁偏置径向磁轴承[J]. 电工技术学报, 2009, 24(11): 53-60.
Sun Jinji, Fang Jiancheng, Wang Xi, Yang Lei, Wang Chun’e. A New Permanent Magnet Biased Radial Magnetic Bearing. Transactions of China Electrotechnical Society, 2009, 24(11): 53-60.
2009, Vol. 24 
