RETRACTED: Dual-mode predictive flexible rotor control for active magnetic bearings with input constraints

Abstract

Active magnetic bearings (AMBs) are often used to mitigate vibrations in turbines, compressors, machining spindles, etc. However, rotor-AMBs are inherent open-loop unstable systems, and hence it is an urgent yet challenging task to stabilize rotor-AMBs with external disturbances. A dual-mode predictive flexible rotor controller is developed hereby for a rotor-AMB system with input constraints. The method is afterwards proved to be capable of enlarging the region of attraction, and hence can effectively mitigate more-intensive vibrations excited by external disturbances, which is desirable in real applications. Finally, experiments are conducted on the rotor-AMB system to show the effectiveness of the proposed dual-mode predictive controller.