Research on Control Strategy of Magnetic Bearing Based on Linear Active Disturbance Rejection Control

For five-degree-of-freedom bearing control system, a linear auto-disturbance rejection control strategy is designed. By using the extended state observer to estimate the internal parameter uncertainty and the total disturbance of the external disturbance, and by using the designed PD control law to compensate the influence of the output of the disturbed object, a method to adjust the bandwidth parameters of the controller and the bandwidth parameters of the observer is proposed. By comparing the simulation curve and performance index with PD control strategy and PID control strategy, the results verify that the linear auto-disturbance rejection control strategy algorithm improves the dynamic and static performance of the system, improves the response speed and control accuracy. This algorithm has the feasibility, validity and superiority in the magnetic bearing control system.