Rotor faults analysis of induction motors

The effects in the motors caused by faults occured in a bar or barss of an induction motor has been a research subject for many years. In this study, the modeling of fults caused by breaking of rotor bar in induction motors was done. The modeling was carried out as two and three dimensional. In a two dimensional analysis, stator current, electomagnetic torque, stator winding flux signals were obtained in time domain and frequency domain by FFT analysis method. Furthermore, by using finite elements method in two dimensional modeling, magnetic flux density and flux lines were obtained. In three dimensional modeling, by using finite elements method for the motors in faulty and active conditions, magnetic flux density was obtained. Results were evaluated and the faılts in rotor bar and bars were tried to be detected.