Non-Linear Fuzzy Logic Control for Magnetic Bearings in Large-Tip Clearance-Active Stall Control Approach

In this paper a prescribed large motion control using active magnetic bearings in a proposed active stall control test rig was developed A finite element method is employed to model and to synthesize the flexible shaft in a closed loop system. A linearized model of the stall rig using conventional PD controllers to 16 magnetic poles (4 opposing C-cores) yields stability and frequency responses. In the mean time the nonlinear model is studied to consider the Ampere's Law, Faraday's Law and the Maxwell stress tensor. A fuzzy logic control system is then designed to show the advantages over the conventional controllers with the fitly nonlinear model.