Speed Control of Three Phase Squirrel Cage Induction Motor Using Fuzzy Logic Controller

摘要

This paper present the scalar speed control of three phase squirrel cage induction motor .In this scalar control method both input and output command are speed. PI and fuzzy logic controller are operated according to speed error to utilize the advantages of both controllers .In fuzzy logic controller two input and one output is used in control operation. Speed of the motor is adjusted by Fuzzy logic controller (FLC) with the help of predefined rules for input and output of fuzzy controller. Two inputs to the FLC are error and change in error. Its output is frequency of AC input of the motor. The control scheme keeps voltage and frequency ratio of induction motor constant. The voltage and frequency input to the induction motor are control in order to obtain desired speed response. This proposed fuzzy controller utilizes the advantages on PI controllers. The simulation results proved that the fuzzy controller performance is superior due to fast response under reference speed and load torque variations. They are comparing in terms of maximum overshoot and settling time with PI and fuzzy controllers.