On Fuzzy PID Controller with Parameters Self-tuning in 2 Degrees of Freedom AC Magnetic Bearings

Based on introducing working principle of 2 degrees of freedom AC-HMB, the principle of producing suspension force is expounded and the mathematics models of suspension forces are set up. The fuzzy PID controller with parameters self-tuning for 2 DOF AC-HMB system is designed, and the fuzzy control rule is present. Within MATLAB7.0/SIMULINK environment, the system simulation model is constructed and dynamic simulation had been completed. Comparing with normal PID controller performance, the results have shown that this parameters self-tuning PID controller not only can improve the system dynamic performances, but also has good self-adjustability and robustness.