Nonlinear Position-Flux Zero-Bias Control for AMB System with Disturbance

This study presents two novel nonlinear controllers for a single one-degree-of-freedom (1–DOF) active magnetic bearing (AMB) system operated in zero-bias mode with externally bounded disturbance. Recently developed controllers are complicated and inherently difficult to implement. The simple and low-order controllers proposed in this paper are designed using nonlinear feedback tools, including Lyapunov-based techniques and control Lyapunov functions (CLFs). The control objective is to globally stabilize the mass position of the nonlinear flux-controlled AMB system with control voltage saturation. The zero-bias AMB control model is derived from the voltage switching strategy. The developed CLF-based controllers are verified by numerical calculations.