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从鲁棒稳定性和抑制扰动的动态性能角度,分析了干扰观测器应用到轴向磁轴承时其有效带宽较低的问题,指出磁轴承易受到低频干扰并提出了一种抑制扰动鲁棒控制方法.基于动态分析建立了轴向磁轴承的名义模型,并设计了内环控制的干扰观测器,采用标准H∞问题的方法设计抑制扰动鲁棒控制器作为外环控制.仿真分析与实验说明了该方法能够提高干扰观测器的带宽,同时,实验验证了对于系统参数不确定性具有较强的鲁棒性能,对比单一的控制方法具有良好的抑制扰动能力.
From the perspective of robust stability and dynamic performance of disturbance rejection, the problem of low effective bandwidth when disturbance observer is applied to axial magnetic bearing is analyzed. It is pointed out that the magnetic bearing is susceptible to low frequency interference and a disturbance rejection robust control The nominal model of the axial magnetic bearing is established based on the dynamic analysis, and the disturbance observer of the inner loop control is designed. The standard disturbance suppression H∞ controller is designed as the outer loop control. Simulation and experiment The proposed method can improve the bandwidth of the disturbance observer. At the same time, the experimental results show that the proposed method is robust to the uncertainties of the system parameters. Compared with a single control method, the proposed method has a good ability of suppressing disturbance.