In order to reduce the power loss of axial permanent magnet biased hybrid magnetic bearings (PMHMB) in Magnetically Suspended Control Moment Gyroscope ( MSCMG), a new low power loss control method is proposed based on integral positive feedback of current. Firstly, the mathematical model of the system is established, and then the increased power loss problem caused by load with the traditional fixed air gap control method is analyzed. The essence of the new method is to utilize the negative displacement stiffness to provide suspension forces, instead of the extra current. The reduction of the winding current is achieved by employing the presented method. The simulation and experimental results show that the new control strategy is able to stabilize the suspension of axial PMHMB successfully and to reduce its power loss more than 90% compared with the fixed air gap control method.%为了进一步降低MSCMG永磁偏置轴向磁轴承的悬浮功耗,在建立其数学模型的基础上,针对传统定气隙控制在承受负载时线圈电流增大的问题,提出了基于电流积分正反馈的轴向磁轴承变气隙控制方法.该方法利用永磁偏置混合磁轴承的位移负刚度提供悬浮力,通过电流反馈改变转子悬浮参考位置来减小磁轴承线圈电流.仿真分析和试验结果表明,该方法具有良好的稳定性,与定气隙控制方法相比,磁轴承静浮时的铜耗降低了90％以上.
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