Voltage signatures between two sub-windings in dual three-phase induction motor under static air-gap eccentricity

The present paper focuses on the analysis of a new diagnostic method based on frequency analysis of voltage between two sub-windings in dual three-phase induction motor. The possibility to extract diagnosis signatures of static eccentricity is investigated. The used model of squirrel cage induction machine takes into account the geometry and the winding layout in order to analyze the impact of the static eccentricity and to predict the related frequencies on the voltage between two sub-windings of the motor. The simulation results and analytical developpement show the effectiveness of the method. Experimental results are provided to underpin the theoretical considerations.