Study of Distinct Approach of Speed Control Methods of Induction Motor

This paper gives the comparative study among various techniques used to control the speed of three phase induction motor .In Industry, more than half of the total electrical energy produced is consumed by electric motor. Among several types of electric motors, three phase induction machines occupy a prominent place. Indeed, at least 80% of industrial control system uses induction motors, which have gradually taken the place of DC machines because of their good performance reliability, simple construction, lower cost and simple maintenance. In the past they have been used as constant speed motors as traditional speed control methods have been less efficient than speed control methods for DC motor. However, DC motors require commutator and brushes which are hazardous and require maintenance. In order to achieve maximum torque and efficiency speed control of induction motor is important. So this paper presents the analysis of some of the advance speed control methods of induction motor.