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This article is presented by:
Hassan Baghgar Bostan Abad
Ali Yazdian Varjani
Taheri Asghar

Using Fuzzy Controller in Induction Motor
Speed Control with Constant Flux

ABSTRACT


Variable speed drives are growing and varying. Drives expanse depend on progress in different part of science like power system, microelectronic, control methods, and so on. Artificial intelligent contains hard computation and soft computation. Artificial intelligent has found high application in most nonlinear systems same as motors drive. Because it has intelligence like human but there are no sentimental against human like angriness and.... Artificial intelligent is used for various points like approximation, control, and monitoring. Because artificial intelligent techniques can use as controller for any system without requirement to system mathematical model, it has been used in electrical drive control. With this manner, efficiency and reliability of drives increase and volume, weight and cost of them decrease.

INTRODUCTION
ECAUSE induction motors require low maintenance and are robust ,have many applications in industry . Along with industry progress, it indicates requirement to progresses drive with high performance. DC motors are control abler than AC motors but they require much cost. In addition, in equal power, DC motors have higher volume and weight. Main variations in semiconductors, converters topology, analyze technique and simulation of electrical machines drive and newer control technique have had role in this progress. Usually classical control is used in motors drive . Design and implementation of Conventional controls have difficulties that nameable:
a) It is basis on mathematical accurate model of system that usual it is not known.
b) Drives are nonlinear systems and Classical control performance with this system decrease .
c) Variation of machine parameters (especially in vector control ) by load disturbance ,motor saturation or thermal variations do not cause expectation performance .
d) Classical linear control shows high performance only for one unique act point.
e) With choose improperly coefficient, classical control cannot receive acceptable result and suitable choose for constant coefficient in especial application condition with set point varying, necessarily is not optimum.

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