Open AccessNonlinear Control of an Active Magnetic Bearing with Output Constraint
Author(s) -
Danh Huy Nguyen,
Tùng Lâm Nguyễn,
Manh Linh Nguyen,
Huy H. Nguyen
Publication year - 2018
Publication title -
international journal of electrical and computer engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.277
H-Index - 22
ISSN - 2088-8708
DOI - 10.11591/ijece.v8i5.pp3666-3677
Subject(s) - control theory (sociology) , magnetic bearing , computer science , nonlinear system , rotor (electric) , stator , observer (physics) , trajectory , lyapunov function , tracking error , control engineering , control (management) , engineering , physics , mechanical engineering , quantum mechanics , astronomy , artificial intelligence
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.