Detection of Broken Bars in Three Phase Squirrel Cage Induction Motor using Finite Element Method

This paper deals with detection of broken bars in three phase squirrel cage induction motor using finite element model of the induction machine. Finite element method is more precise than the winding function approach, as it is based on the actual geometry of the machine. The machine model can easily be modified to study the effect of faults on the machine‟s performance. Accurate models of the machine under healthy and faulty conditions are developed. The static two-dimensional analysis is done for broken bar fault. The machine parameters like flux linkage, flux density and stored magnetic energy are obtained for healthy and faulty motor. The results examined under various conditions are compared and the observations are presented.