This paper presents the design and experiment of a hybrid fuzzy control scheme for a high performance brushless DC motor drive system. Both the design of the fuzzy controller and its integration with the proportional integral (PI) in a global control scheme are discussed. The principle of the proposed control scheme is to use a PI controller, which performs satisfactorily in most cases, while keeping in the background, a fuzzy controller, which, is ready to take over the PI controller when severe perturbations occur. Performance of the hybrid fuzzy-PI controller is evaluated through a laboratory implementation. The laboratory implementation is based on a linguistic fuzzy controller whose design is derived from the expert knowledge during disturbed phases. Experimental results have shown excellent tracking performance of the hybrid control system, and have convincingly demonstrated the usefulness of the hybrid fuzzy controller in high performance drives with uncertainties.
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