基于转子不平衡响应的磁轴承磁力参数辨识

针对磁轴承磁力参数理论设计值不精确的问题,提出了一种基于不平衡响应的磁力参数实验辨识方法.利用转子的质量不平衡在高速转动时的离心力效应,通过检测磁轴承在零电流控制状态下的同频位移响应和零位移控制状态下的同频电流响应,解算磁轴承磁力参数.设计了基于通用陷波器原理的零位移控制器和零电流控制器,并通过设置T矩阵保证闭环系统稳定.实验结果表明:基于不平衡响应的磁力参数辨识方法,辨识结果与理论设计值差别在20%之内,证明了该方法的正确性和改进磁轴承力学参数的有效性.

Parameter identification of magnetic bearing based on rotor unbalance responses

The force parameters of magnetic bearing obtained by theoretical design method were usually inaccurate. To solve this problem, an identification method based on rotor unbalance responses was proposed. Making the rotor rotate at high speed, the eccentric effect of the rotor imbalance can be used. The force parameters of magnetic bearing were calculated by measuring the synchronous currents when the rotor was in the null-displacement control mode and the synchronous displacements when the rotor was in the null-current control mode. The null-current controller and the null-displacement controller were designed based on the generalized notch filter theory, and the T matrix was set up to ensure the close loop was stable. The experimental results indicate that the difference rate between experiment identification result and the theoretical design result is within 20%. And it proves that the method is correct and effective to improve the identification precision for the force parameters of the magnetic bearing.