Analysis of the electromagnetic field of an induction motor with broken rotor bars

The paper presents studies on the determination of the induction motor broken rotor bars on the basis of the analysis of the electromotive forces signals in the measuring windings on the stator in the self-running-out mode. The analysis of the electromagnetic field of the induction motor with broken rotor bars has been performed. Using a chain mathematical model and a model based on the finite element method the induction motor electromagnetic field in the selfrunning-out mode has been calculated. The calculation resulted in obtaining the curves of the electromotive force in the stator windings. It has been shown that these curves contain information signs of broken bars. Using measuring windings has allowed the localized identification of broken rotor bars.