JEE_V3_N1_RP3 K. Naga Sujatha K. Vaisakh Journal on Electrical Engineering 2230 – 7176 3 1 20 26 Fuzzy Logic Controller, Induction Motor Drive, SCR Controllers This paper presents a speed control scheme using a new and simple structure of fuzzy logic controller (FLC) for a closedloop, variable speed induction motor (IM) drive. The drive makes use of thyristor on the secondary side as phasecontrolled ac switches operating at slipfrequency. Such phase-controlled thyristor allows the torque of the machine to be varied from zero to values bounded by the normal torque/speed characteristic of the basic motor. The various functional blocks of the system which govern the system behavior for small variations about the operating point are derived, and the transient responses are presented. The proposed FLC is developed to have less computational burden, which improves the dynamic behavior of the induction motor drive. July - September 2009 Copyright © 2009 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=997