Mathematical Problems in Engineering
Volume 2007 (2007), Article ID 58410, 22 pages
Research Article

Field-Weakening Nonlinear Control of a Separately Excited DC Motor

Mohamed Zribi and Adel Al-Zamel

Department of Electrical Engineering, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait

Received 17 March 2006; Accepted 30 January 2007

Academic Editor: Giuseppe Rega

Copyright © 2007 Mohamed Zribi and Adel Al-Zamel. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper investigates the design and implementation of nonlinear control schemes for a separately excited DC motor operating in the field-weakening region. A feedback linearization controller, a Corless-Leitman-type controller, and two nonlinear controllers are designed and implemented for a DC motor system. The stability of the closed-loop system is proved using Lyapunov theory. A hardware testbed is constructed to experimentally verify the designed controllers. The hardware consists of a DC motor system, a DSP controller board, a power module, two current sensors, and a tachogenerator. The experimental results indicate that the developed controllers work well.