Proceedings of international conference on modeling, optimizing and computing (ICMOC 2012) 1308 GAIN SCHEDULING CONTROLLER DESIGN FOR AN ELECTRIC DRIVE Prof.G.Glan Devadhas Head of department Dept. of Electronics and Instrumentation Noorul Islam Centre for Higher Education Thuckalay, Tamilnadu Email:glandeva@gmail.com LAKSHMI M NAIR Dept. of Electronics and Instrumentation Noorul Islam centre for higher education Thuckalay, Tamilnadu Email:lakshmiimnair@yahoo.com Abstact: Conventional PID controllers were used to control various industrial processes from many years due to their simplicity in operation. mathematical models are used to control the plant for different process control applications. In this paper a dynamic model of dc motor is developed A comparative study between the performance of PI controller and fuzzy logic controller is done. A gain scheduling PI FUZZY controller is designed and implemented and various performance parameters are compared with fuzzy logic controllers. The paper shows superior performance of gain scheduling controllers over conventional controllers. keywords-DCmotor.PIcontroller,Fuzzylogic controller, I-Fuzzy gain scheduling controller I INTRODUCTION Permanent magnet direct current motor (PMDC) have been commonly used in high-performance electrical drives and servo system. There are many difference DC motor types in the market some of which have good attribute and some have bad attribute.. Example of such bad attribute is the lag of efficiency. In order to overcome this lag of efficiency a controller is introduced to the system. There are also many types of controller used in the industry, such controller is PID controller. PID controller or proportional– integral–derivative controller is a generic control loop feedback mechanism widely used in industrial control systems. A PID controller tries to correct the error between a measured process variable and a desired set point by calculating and then outputting a corrective action that can adjust the process as per our needs.. So by integrating the PID controller to the DC motor were able to correct the error made by the DC motor and control the speed or the position of the motor to the desired point or speed. The objective is to control the speed of DC series wound motor.these type of motors which are used usually in electric trains, self starting of engines, elevators and complex industrial mixing process. The series wound motor is selected for this work because it provide excellent torque load properties to the system which other motor of this class cannot provide. if portable devices are yo be used and transported then the only option is to use DC motor as most portable devices. DC power source is available and it make less expensive to the device if DC to AC convertor not used. II PROPORTIONAL INTEGRAL CONTROLLER The PID controller is a feedback mechanism widely used in a variety of applications. The controller calculates an error that is the difference between a measured process variable and the desired set-point value needed by the application.PID controllers will attempt to minimize the process error by continually adjusting the inputs. • Proportional (often called the “gain”): determines the reaction to the current error