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Robust control of multi‐axis magnetic bearing systems
Author(s) -
Yeh T.J.,
Chung YingJer,
Wu WeiChung
Publication year - 2001
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.608
Subject(s) - control theory (sociology) , backstepping , robust control , magnetic bearing , robustness (evolution) , nonlinear system , sliding mode control , controller (irrigation) , feedback linearization , linearization , computer science , control system , engineering , control engineering , control (management) , adaptive control , physics , magnet , artificial intelligence , mechanical engineering , agronomy , biochemistry , chemistry , biology , gene , electrical engineering , quantum mechanics
This paper proposes robust control schemes for multi‐axis magnetic bearing systems under current control and voltage control. The control schemes are based on a model which characterizes not only the electromagnetic interaction but also secondary effects such as flux leakage, fringing fluxes, and finite core permeance in the magnetic bearing. In the current control case, a sliding‐mode‐based robust controller, whose control parameters have to be deliberately chosen to account for the uni‐directionality of magnetic forces, is proposed to provide robust performance against uncertain dynamics. In the voltage control case, a control scheme that combines the sliding methodology and the backstepping technique is used to provide robust performance under the influence of the electrical dynamics. It is demonstrated through simulations and experiments that, because the nonlinearity and the uncertainty inherently residing in the system behaviour are directly tackled, the proposed controllers achieve superior tracking performances compared to control lers based on linearization. Copyright © 2001 John Wiley & Sons, Ltd.