EFFECT OF SKEWING ON THE COGGING TORQUE IN INDUCTION MACHINES

ABSTRACT

This paper presents a simplified method to predict the cogging torque in induction machines including the skewing effect An equivalent circuit including die effect of both slot harmonics and rotor skewing is developed. A special attention is paid to study the skewing effect on the machine behaviour especially at starting instant. Moreover, the leakage reactance due to the skewing is calculated using the suggested method. Useful conclusions are given at the end of this paper which is thought of good use and valuable for both designers and users of squirrel cage induction motors.