Robust stabilization and experimentation of a voltage-controlled three-pole active magnetic bearing system

The robust stabilization of a voltage-controlled 3-pole active magnetic bearing (AMB) system is considered in this study. The system could suffer both matched and mismatched uncertainties. A robust controller is designed using the backstepping technique to stabilize the system. The robust controller is composed of two stages of integral sliding mode control. The first stage is a robust controller for the current-controlled 3-pole AMB system, which is a nonaffine nonlinear system. It is designed by the feedback linearization approach incorporated with the integral sliding mode control. The overall robust stabilizing controller is verified experimentally.