基于在线动平衡的磁轴承参数辨识

针对磁悬浮刚性转子系统,提出了一种基于在线动平衡的磁轴承参数辨识方法。采用已知大小和相位的不平衡质量作为激振源,根据动平衡仪测得的转子不平衡响应,求得磁轴承位移刚度和电流刚度。利用某型磁悬浮控制力矩陀螺对该方法进行了试验验证,得到了一定转速范围内的磁轴承位移刚度和电流刚度,证明了该方法的正确性和实用性。试验结果表明外转子型磁轴承位移刚度和电流刚度随转速的增加而下降明显。

Parameter identification for magnetic bearingbased on online dynamic balancing

Based on online dynamic balancing, a novel parameter identification method is proposed for magnetic suspending rigid rotor system. Two unbalancing masses with given magnitude and phase are added to the rotor and used as vibration exciter. The displacement stiffness and current stiffness are identified from the unbalancing response detected by balancing monitor. The proposed method is experimentally validated with a magnetic suspending control moment gyroscope, and the displacement stiffness and current stiffness of its magnetic bearings are obtained for a certain rotational speed interval, which demonstrates the correctness and feasibility of the method. The experimental results show that the displacement stiffness and current stiffness decrease notably with the increased rotational speed for an outer rotor magnetic bearing.