EFFECT OF AIR GAP ON THE PERFORMANCE OF HIGH SPEED INDUCTION MOTOR

Abstract

In a high speed induction motor the solid rotor may be the best possible rotor construction. Unfortunately, the electromagnetic properties of a solid rotor motor are poorer than the properties of the traditional laminated rotor of an induction motor. The electromagnetic torque of the induction motor reduces when the motor is fed from high frequency source. This paper presents the methods for improving the electromagnetic torque of a 180 KW medium-speed solid-rotor induction machine using 2-Dimentional finite element method. The length of air gap in the motor is reduced and the effect of different air gap length is studied for electromagnetic torque, power factor and output power of induction motor. It is shown that torque is increased with low value of air gap length. An optimum value of air gap length is found for proper operation of induction motor.