基于干扰观测器的磁轴承转子系统振动抑制

Vibration Suppression of Rotor System of Magnetic Bearing Based on Disturbance Observer

为解决磁轴承转子系统中因质量不平衡带来的同频干扰问题,提出了复合控制算法,实现对转子系统的稳定控制。将比例微分(PD)和干扰观测器(DOB)相结合,使得控制输入中的扰动信号被观测并抵消掉。通过劳斯判据法证明了系统的稳定性,然后建立转子系统动力学模型;干扰观测器的结构以及控制器的设计,最后,通过仿真验证表明,上述算法比传统比例微分控制算法更有效,且所提方法具有在变转速情况下振动抑制效果好,同时具有良好的控制性能与鲁棒性。

In order to solve the problem of co-channel interference caused by mass imbalance in the magnetic bearing rotor system,a composite control algorithm is proposed to achieve stable control of the rotor system.The proportional derivative(PD)and the disturbance observer(DOB)are combined such that the disturbance signal in the control input is observed and cancelled out.The stability of the system is proved by the Rolls criterion.Then the dynamic model of the rotor system is established.The structure of the disturbance observer and the design of the controller.Finally,the simulation results show that the algorithm is more effective than the traditional proportional differential control algorithm.The method has good vibration suppression effect under variable speed,and has good control performance and robustness.