三支承磁悬浮轴承的不对中特性

Researchon the Misalignment Properties of Three Magnetic Bearings System

应用多个磁悬浮轴承支承的转子系统,由于机械加工以及安装等方面的误差会导致各个磁悬浮轴承之间有一定的不对中量。提出了将转子偏离磁轴承中心悬浮,以减小各个支承悬浮位置的不对中量;结合单自由度磁轴承控制原理,分析了转子悬浮位置偏离中心对磁轴承悬浮性能的影响;从理论和试验两个方面对比研究了3个不对中磁悬浮轴承支承的转子悬浮在磁轴承中心和偏离中心后磁轴承的控制电流和抗扰动性能。研究结果表明一定程度的偏离磁轴承中心悬浮能够提高磁悬浮轴承系统的稳定性。

Due to the error of machining and installation,there will be a little misalignment among the active magnetic bearings（ AMBs） when a rotor supported by multi-magnetic bearings. In this paper,the levitation position of the rotor is adjusted to deviate from the center of the magnetic bearing to reduce the misalignment of the bearings. Based on the control principle of single-degree-of-freedom AMB,the influences of the position that the rotor suspended in the AMB on the performance of the AMB is analyzed. For the three misaligned AMB,the control current and the disturbance rejection ability of the AMBs are studied from the theoretical and experimental aspects in the situations of the rotor suspended in and deviate from the center of the AMB. The results show that the rotor levitated in the position which deviate from the center of magnetic bearing may improve the stability of the AMB system.