Title :
Feedback linearization and fuzzy control for conical magnetic bearings
Author :
Lin, Lih-Chang ; Gau, Tzyh-Biau
Author_Institution :
Dept. of Mech. Eng., Nat. Chung-Hsing Univ., Taichung, Taiwan
fDate :
7/1/1997 12:00:00 AM
Abstract :
Conical magnetic bearings with radial and thrust (axial) control using the input-output feedback linearization method are considered. By suitable selection of nine output variables, the nonlinear magnetic bearing system is transformed to nine linear decoupled subsystems with no internal dynamics using feedback linearization control. Furthermore, a hybrid approach integrating feedback linearization and fuzzy control is proposed for improving the transient performance and robustness of the nonlinear magnetic bearings. Computer simulations are shown to illustrate the effectiveness of the proposed control strategy for simultaneous rotor-shaft speed tracking control and gap deviations regulation
Keywords :
closed loop systems; feedback; fuzzy control; large-scale systems; linearisation techniques; machine bearings; magnetic devices; nonlinear control systems; position control; robust control; velocity control; conical magnetic bearings; feedback linearization; fuzzy control; gap deviations regulation; hybrid approach; linear decoupled subsystems; nonlinear magnetic bearing system; radial control; robustness; rotor-shaft speed tracking control; thrust control; transient performance; Control systems; Fuzzy control; Linear feedback control systems; Magnetic levitation; Magnetic variables control; Nonlinear control systems; Nonlinear dynamical systems; Nonlinear magnetics; Output feedback; Robust control;
Journal_Title :
Control Systems Technology, IEEE Transactions on
