Model for three-phase induction motors with stator core faults

A new dynamic model for an induction motor (IM) in abc machine variables is proposed in this work. This model is able to represent asymmetrical stator core faults (SCF) by modelling them as the variation of the equivalent core loss resistance per phase. One model in qd0 variables and another one in sequence components are deduced and used as tools to analyse and simulate SCF. It is demonstrated that there is a good correlation between SCF severity and the magnitude of the IM stator negative sequence current, impedance and power. The comparison of simulation and experimental results suggests the validity of the theoretical proposal.