DESIGN OF LINEAR INDUCTION MOTOR FOR STIRRER APPLICATION

Abstract

The idea of a LIM had been suggested in 1895 and was first developed by an English Electrical Engineer, Eric Laithwaite. He spent the rest of his career investigating these special machines. His colleagues are currently designing a launch system with linear motors, which is a more efficient alternative to the rockets used to launch spacecraft. Linear Induction Motor operates on the same principle as the conventional rotary motor. The rotary motor is cut out and laid flat to from the equivalent Linear Induction Motor. Nothing has changed only the direction of motion has changed. Now a day's Linear induction motors (LIM) . are used in many different applications, from slow moving sliding doors to high-speed trains around the world. Anything that requires linear motion will require a Linear Induction Motors. Linear Induction motor is a heart of Electromagnetic stirrer (EMS) which is also used in steel manufacturing plant for continuous casing process. Electromagnetic stirring is mostly used for continuous casting of steel in order to improve uniformity of casting structure. The quality of produced steel (casting structure) will depend on Stirrer design, number of poles and operating frequency of EMS. During this process of casting of steel, guided electromagnetic forces that are generated from in-mold electromagnetic stirrer (M-EMS) systems are commonly applied to reduce the time of production and it also reduce impurities. The nature of this force can further be improved by the two proposed designs in this dissertation and with Finite Element Analysis (FEA) the three dimensional (3-D) model for the proposed scheme is tested and significant improvement is found in the performance of EMS.