ABSTRACT: Various control strategies of controlling inverter fed Induction Motor Drives have proved good steady state performance but poor dynamic performance. In order to achieve good dynamic performance and to meet the preferences set by DC drives variable speed AC Drives came into existence. This paper presents an intelligent speed controller for an indirect field oriented controlled induction motor drives. Here by separating the current produced by the stator into flux and torque producing components of an induction motor, indirect field oriented control is implemented. SVM based indirect vector controlled induction motor drive with PI controller is first developed and replaced by employing fuzzy controller via an intelligence-based Fuzzy PI controller in order to achieve better dynamic response. By considering the behaviour of the FLC the speed, torque and stator voltage responses were observed and compared with the PI controller using MATLAB/Simulink. KEYWORDS: PI controller, FLC, indirect vector control, modelling of induction motor I.INTRODUCTION Today's sophisticated industrial drives are the result of the far research and improvement during last decade. The hence so-called vector control or field oriented control (FOC) was one of the most important inventions in AC motor drives which opened the gate for the researchers to take the aim for ever enhancing control of performance. And by other aspects, there are many process control benefits that might be provided by adjustable speed drive such as smoother operation, acceleration control, different operating speeds, control of torque etc., In the past decades, Induction and synchronous machines were used for constant speed applications. This was mainly because of unavailability of variable frequency supply. The advancement in electric drive systems is related to the development of power semiconductor devices. The introduction of Silicon-controlled rectifier in 1957 initiated further more development in electrical drive systems. In early 1960's, the improvement in fabrication of BJT along with the PWM technique has significantly contributed to achieve improvement in AC drives. But required precise torque control is not obtained and was still dominated by DC drives. This high performance torque control was achieved with the invention of Field Oriented Control or Vector control in 1972', which was developed by Prof. Blashke in his publications. Vector control of induction motors allows the decouple analysis where the torque and flux components are independently controlled just as in Dc motor. In vector control scheme, the stator phaser currents are resolved into two components and with this individual torque and flux control is possibl
