Analysis of Asynchronous Operating Conditions of Synchronous Machines Using Classical and Electromagnetic Models

Abstract

Analysis of asynchronous conditions in a synchronous machine was initially made by classical method following the generalized machine theory. Later on, it took a turn after the advent of solid iron rotor/solid iron pole-shoe. It was noted that there is a discrepancy between computed and actual quantities between results obtained by the classical and the non-classical model. It was gradually understood that the reason behind this discrepancy was the effect of distributed eddy currents in the solid metallic parts. Authors like B.J. Chalmer, B. Adkins, A. Canay, and others, contributed much to the analysis of asynchronous conditions by adopting new techniques. The paper presents the methodology for using these techniques to estimate the asynchronous variables under loss of excitation (LOE), also to find the same by classical method based on generalized machine theory.