Nonlinear Control of an Active Magnetic Bearing with Output Constraint

Danh Huy Nguyen (Hanoi University of Science and Technology)
Tung Lam Nguyen (Hanoi University of Science and Technology)
Manh Linh Nguyen (Hanoi University of Science and Technology)
Huy Phuong Nguyen (Hanoi University of Science and Technology)

International Journal of Electrical and Computer Engineering
Vol 8, No 5: October 2018

In this paper, an appropriate control strategy is proposed to handle the nonlinear dynamics ofan active magnetic bearing (AMB). The goal of the control design is to drive the AMB rotor to the origin with improved transient response. In order to achieve this task, back stepping control technique with a barrier Lyapunov function are employed to keep the tracking error trajectory inside a predefined zone to avoid possible mechanical contact between rotor and stator. Besides, a speed observer is also used since information about rotor speed is not always available. The stability of the closed-loop system is proven. The effectiveness of the proposed control strategy is verified by numerical simulations.