Disturbance Rejection via Fuzzy Control with Disturbance Observer for Active Magnetic Bearing System

For the system parameter variations and external disturbance of active magnetic bearing system, a disturbance observer (DO) based fuzzy control (FC) method is proposed to achieve disturbance rejection. The capacity of fuzzy logic to comprehend the inaccuracies and uncertainties of the actual world makes it useful in many complex systems that cannot be covered by classical controllers. Since active magnetic bearing system full of uncertainty due to parameter variations and external disturbance, the fuzzy control (FC) could be applied. Combined with observer-based state feedback, the proposed control approach estimates and attenuates the disturbances. Finally, the availability of the proposed approach is testified by simulation. In order to make a comparison, the PID control and PID + DO control are realized. The consequence indicate that compared with PID and PID + DO control, this strategy has better interference rejection capabilities.