Md Shah Faisal Int. Journal of Engineering Research and Application www.ijera.com ISSN : 2248-9622, Vol. 8, Issue5 (Part -IV) May 2018, pp 03-07 www.ijera.com DOI: 10.9790/9622-0805040307 3 | Page Speed Control of Three Phase Squirrel Cage Induction Motor Using Fuzzy Logic Controller. Md Shah Faisal *, Sankalp Paliwal** *(Department of Electrical Engineering, BBD University, Lucknow, ** Assistant Professor, Department of Electrical Engineering, BBD University Corresponding Auther : Md Shah Faisal ABSTRACT- 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. KEYWORDS –Induction motor, PI controller, and fuzzy logic controller, scalar control Method V/F Control, MATLAB/ SIMULINK --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 03-05-2018 Date of acceptance: 19-05-2018 --------------------------------------------------------------------------------------------------------------------------------------- I INTRODUCTION An induction or asynchronous motor is a type of AC motor where power is supplied to the rotor by means of electromagnetic induction, rather than a commutator or slip rings as in other types of motor. The distinguishing feature of an induction motor is that no DC field current is required to run the machine [1-3]. These motors are widely used in industrial drives, particularly polyphase induction motors, because they are rugged and have no brushes. Their speed is determined by the frequency of the supply voltage, so they are most widely used in constant-speed application. The use of induction motor has increased tremendously since the day of its invention. They are used as actuators in various industrial process, robotics, and house appliances. The use of this motor is associated with its simple and rugged construction, low cost, minimum maintenance, and sufficiently high speed. Speed control is one of the various imposed constraints for the choice of a motor. Hence, in the last few year it has been studied by many, and various method for the same have been developed. Various types of adjustable speed AC motor drives have been developed over the years depending upon control principal, drive can be classified as scalar controlled or vector controlled[4][5]. Several studies are going on in the field of vector control due to better dynamic response. However, Scalar control is widely used in industries because of its simple structure characterized by low steady-state error. Vector control method is very complex. However scalar control method is very simple and can achieve low steady state error. Therefore, scalar control based on constant V/F ratio is used in this work. The field of power electronics has contributed immensely in the form of voltage frequency converts which has made it possible to vary the speed over a wide range [6][7]. However, the highly non –linear nature of induction motor control dynamics demand strenuous control algorithm for the control of speed. The controllers types that are used are: proportional integral (PI), fuzzy logic controller (FLC) or a blend between them.FLCs have the ability to adapt with nonlinearity. Also, the control performance is less affected by plant parameter variations. FLCs are based on certain well defined linguistic rules Fuzzy logic controller can work under non-linear condition. Performance of fuzzy controller is analyzed and explains with the rule. This paper starts with introduction which describes about three phase induction motor, the control technique and the two controllers PI and FLC which is used for motor controlling. The 2 RESEARCH ARTICLE OPEN ACCESS