P-Fuzzy-PID control in a machine tool magnetic suspension system

Magnetic suspension platform system (MSPS) is a typical non-linear and hysteresis system, so itpsilas difficult to obtain the precise mathematic model and to cater the requirement of rapidity, stability and robustness by applying traditional PID or fuzzy controller separately. Aimed at the characteristics of MSPS, a composite control model combining PID with fuzzy (P-fuzzy-PI) is introduced by applying P part to improve the systempsilas rapidity, applying fuzzy part to improve the systempsilas dynamic characteristics and applying PI part which can erase static error to improve the systempsilas steady characteristics. The result of simulation shows that the fuzzy-PID controller has a perfect effect in MSPS control.