Design Method for the Magnetic Bearing Control System with Fuzzy-PID Approach

The five degree freedom magnetic bearing is researched and its structure and working principles are introduced also. Based on the fuzzy control technology, combining fuzzy algorithm and PID control method, identifying the transition process mode of the online system to get the PID parameters' self-adjusting, the magnetic bearing system's Fuzzy-PID nonlinear controller is designed by analyzing the system control demands. The Fuzzy-PID nonlinear controller can deal with the magnetic bearing system's open loop instability and strong nonlinearity, and the approach could improve the system's rapidity, adaptability, stability and dynamic characteristics. Comparative analysis and experiments are conducted between linear PID and nonlinear fuzzy-PID control methods, the results show that the fuzzy-PID controller is better, and the five-freedom magnetic bearing's rotary precision experiments are conducted by the fuzzy-PID controller, it satisfies the control rotary precision demands and realizes the bearing's steady floating and rotating.