A Control Approach for Limiting Overshoot in Transient Response of an Active Magnetic Bearing ☆

A nonlinear controller design procedure for high performance 2DOF active magnetic bearings (AMB) with rotor response constrain is presented in the paper. The nonlinear dynamics of the AMB are derived. Based on the strictly feedback form of the AMB mathematical model, backstepping control is employed to design the the switching type controller that can steers the AMB rotor at the origin. The overshoot and undershoot of the rotor response are limited winthin expected value due to the selectrion of the Lyapunov candidate function in control design process. Stability of the whole system is proven properly. Simulations show the ability to stabilize the system of the proposed control.