DETERMINATION OF TOTAL TRANSFORMER LOSSES RESULTING FROM SEMIROTATINGFLUX EXCITATION

Theoretical and experimental studies have shown that hysteresis losses in a magnetic material subject to an applied rotating field decreases considerably as the field amplitude drives the magnetization into sat uration. Recently, low core loss transformers operating with semirotat ing flux excitation have been proposed. The purpose of this paper is t o present an analytical investigation of the overall iron and copper l osses of such transformers. In this analysis, core magnetic properties are accurately represented and simulated using vector Preisach models . A sample design for a 110 V, 165 VA single-phase transformer with se mirotating flux excitation is given and quantitative analytical result s are used its a guide to determine its optimum operating conditions.