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In this paper an accurate modeling of air-gap length function in polar and interpolar regions of non- isotropic synchronous generators is presented, for use in the MWFA (modified winding function approach), to obtain accurate machine simulations with eccentricities. Air-gap in interpolar regions is usually poorly modeled in current literature. Inductances obtained by the improved MWFA have been compared...
Experimental work is presented in this paper, that clearly indicates the good behavior of some novel rotor bar fault indicators for converter-fed squirrel cage induction motors. The ratio of the fifth harmonic upper sideband on the seventh harmonic and the ratio of the seventh harmonic lower sideband on the fifth harmonic seem to be good broken bar indicators, largely independent on load conditions...
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