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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Duc Chinh Hoang
Hanoi University of Science and Technology
Control & Systems Engineering Electrical & Electronics Engineering

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A non-linear control method for active magnetic bearings with bounded input and output Danh Huy Nguyen; Lam Tung Nguyen; Duc Chinh Hoang
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 4: December 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v11.i4.pp2154-2163

Abstract

Magnetic bearing is well-known for its advantage of reducing friction in rotary machines and is placing conventional bearings where high-speed operations and cleanliness are essential. It can be shown that the AM is a nonlinear system due to the relation between the magnetic force and current/rotor displacement. In this paper, a mathematical model of a 4-DOF AMB supported by four dual electric magnets is presented. The control objective is placed in a view of control input saturation and output limitation that are meaningful aspect in practical applications. Backstepping algorithm based control strategy is then adopted in order to achieve the high dynamic performance of the bearing. The control is designed in such a way that it takes input and output constraints into account by flexibly using hyperbolic tangent and barrier Lyapunov functions. Informative simulation studies are carried out to understand the operations of the machine and evaluate the controller quality.
Co-Authors Danh Huy Nguyen Lam Tung Nguyen