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Advances in Fuzzy Systems
Volume 2011, Article ID 354980, 9 pages
Research Article

Simplified Fuzzy Control for Flux-Weakening Speed Control of IPMSM Drive

1School of ITEE, The University of Queensland, Brisbane, QLD 4072, Australia
2Islamic University of Technology, Dhaka, Gazipur 1704, Bangladesh

Received 28 April 2011; Accepted 10 May 2011

Academic Editor: Salvatore Sessa

Copyright © 2011 M. J. Hossain et al. 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 presents a simplified fuzzy logic-based speed control scheme of an interior permanent magnet synchronous motor (IPMSM) above the base speed using a flux-weakening method. In this work, nonlinear expressions of 𝑑-axis and 𝑞-axis currents of the IPMSM have been derived and subsequently incorporated in the control algorithm for the practical purpose in order to implement fuzzy-based flux-weakening strategy to operate the motor above the base speed. The fundamentals of fuzzy logic algorithms as related to motor control applications are also illustrated. A simplified fuzzy speed controller (FLC) for the IPMSM drive has been designed and incorporated in the drive system to maintain high performance standards. The efficacy of the proposed simplified FLC-based IPMSM drive is verified by simulation at various dynamic operating conditions. The simplified FLC is found to be robust and efficient. Laboratory test results of proportional integral (PI) controller-based IPMSM drive have been compared with the simulated results of fuzzy controller-based flux-weakening IPMSM drive system.