Control and Dynamics of a 2-Degree Rigid Rotor - Magnetic Bearing System with Time Delay

The introduction of digital control into AMB systems brings us not only many benefits but also the time delay in computing control output, so called computing time delay. In this paper, a 2-degree rigid rotor magnetic system is employed and the negative effect of computing time delay on this system is discussed. Then an attempt to improve control strategies on compensation for time delay is made and a state predictive module is introduced into closed-loop control system. Simulation results show the control performance degrades owning to computing time delay, even causing instability when the value of time delay exceeds the upper bound as we discussed. And via the addition of time delay compensating module, the control performance is well improved, indicating the effectiveness of the proposed method. Index Terms– time delay, stability, control.