Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG

In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) vibration characteristics of end windings. contrast previous studies, study focuses not only on winding EF/vibration under normal radial static air gap eccentricity (RSAGE) conditions, but also for cases dynamic (RDAGE) hybrid (RHAGE). Firstly, magnetic flux density (MFD) is derived (RAGE) faults, detailed EF expressions obtained before after RAGE fault. The experimental studies were performed a four-pole DFIG at speed 1500 rpm verify proposed analysis. It shown that RSAGE enlarges EF/end does introduce new frequency components. RDAGE increases introduces RHAGE can be seen as superimposed effect RDAGE.