Analysis of a wound rotor induction machine low frequency vibroacoustic emissions under stator winding fault conditions

This paper examines the wide-band vibroacoustic emissions of a medium power industrial wound rotor induction machine (WRIM) design operating with balanced windings and also with a stator winding fault. The aim of the presented study is to enable a clearer understanding of the possible spectral content of the WRIM vibration and acoustic emission signals in healthy and electrical fault conditions, with a view to assessing the possibility of vibroacoustic based electrical fault recognition. For this purpose, an experimental study is undertaken on a laboratory test rig in which the low frequency spectral content of the synchronously recorded vibration and acoustic emissions signals is mapped and correlated for healthy and faulty operating conditions. It is shown that the wide band winding fault induced changes can be clearly correlated and recognised in both the vibration and the acoustic emission signals of the investigated machine design.