Feedback Linearization and Robust Control for Whirl Mode With Operating Point Deviation in Active Magnetic Bearings-Rotor System

• Published in: IEEE transactions on industrial electronics (1982) Vol. 70; no. 8; pp. 7673 - 7682
• Main Authors: Liu, Ximing, Ma, Xin, Zheng, Shiqiang, Zhou, Jinxiang, Chen, Yulin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Control moment gyro (CMG); Control systems; Controllers; Deviation; Feedback linearization; Force; Magnetic bearings; Magnetic levitation; operating point deviation; Proportional integral derivative; Robust control; Rotors; Stability analysis; State space models; Stators; Torque; whirl mode
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2022.3210508

The whirl mode, seriously affecting the stability of active magnetic bearings (AMBs), is a hot issue in the AMBs-rotor system. This article stresses a whirl mode problem accompanied by the operating point deviation when the magnetically suspended control moment gyro outputs torque. A feedback linearization controller is proposed to decouple the whirl mode effects from the system state-space representation. A robust controller for uncertain systems is also used to solve the operating point deviation problem. First, the AMBs-rotor system's state-space representation containing the whirl mode terms is described. Next, a system uncertainty caused by the operating point deviation is discussed. Then, a feedback linearization controller combined with a robust controller for uncertain systems is designed. Finally, simulations and experiments for validity verification are presented, and comparative experiments with a PID controller and a robust controller are shown and compared in this article.