Online Stator Fault Diagnostics and Performance Comparison of Stator Winding Configurations in Symmetrical Six-Phase Induction Motors

Multiphase machines provide various significant benefits when compared to three-phase ones. Their most alluring quality is frequently thought to be their innate forgiveness of flaws. The Inter-Turn Short Circuit Fault (ITSCF) is among the potential failure types that are particularly frequent. As opposed to this, multiphase machines with symmetrical winding arrangements provide a variety of options for stator winding configurations. In this study, the symmetrical six-phase induction motor (6SPIM) was controlled by a model predictive control (MPC) algorithm, an attractive control scheme for the regulation of multiphase electric drives since it easily exploits their inherent advantages. The proposed indicators, which are based on the stator’s voltages and currents’ symmetrical components ratio, offer reduced calculations, are non-invasive, and are a relatively affordable budget solution. Using the stator’s windings, impedances are estimated from the magnitudes of the fundamental spectrum component of both current and voltage signals measured using the Short Time Least Square Prony’s (STLSP) method. The work was validated using experimental results, taking into consideration different operating conditions and the different types of stator winding configurations (double star, double delta, and hexagon connection).