Cross Current Losses in the Rotor of Induction Motors with Cage Bars

Abstract

When the cage bars of induction motor are skewed, the potential difference is induced between the cage bars and core. Therefore, the cross current losses occur as a result of cross currents flowed through cores and cause reducing the machine efficiency. In order to calculate the cross current losses, it is essential to evaluate the potential distribution on the cage bars and the actual cross resistances between the cage bars.
This paper states about method of computing the cross current losses taking account of not only the construction data of the armature and the rotor, but also the actual cross resistance between the cage bars.