Factors affecting the accuracy of determining the saturated synchronous machines cross-magnetizing parameters by the Finite Element Method

The cross-magnetizing phenomenon of saturated synchronous machines plays an important role in their analysis using the two-axis frame models. To determine the parameters representing this phenomenon by the finite element method (FEM), the analysis has to be performed for excitations in the direct, quadrature and intermediate axes of the synchronous machines. This paper presents some investigations of the effect of some of the factors which may affect the accuracy of the analysis. To verify the accuracy of the calculated cross-magnetizing parameters, a specially-designed synchronous machine that can be excited from both its direct and quadrature axes is used to measure these parameters experimentally. The results of these studies have shown that the calculated parameters representing the cross-magnetizing phenomenon using the finite element method are in a good agreement with the measured values.