Simulation and detection of dynamic air-gap eccentricity in salient-pole synchronous machines

This paper presents the effect of dynamic air-gap eccentricity on the perfo rmance of a salient-pole synchronous machine. The modified winding function approach (MWFA) accounting for all space harmonics has been used for the c alculations of machine winding inductances. In addition, the winding induct ances have been calculated by the finite-element method to support those ca lculated by the MWFA. Relationships between stator-current-induced harmonic s and dynamic air-gap eccentricity were investigated. The coupled magnetic circuits approach has been used for modeling the synchronous machine perfor mance under the dynamic air-gap eccentricity. Finally, experimental results to substantiate the theoretical findings are presented.