A New Method of Modeling Magnetic Saturation in Electrical Machines

Performance of any electrical machine is greatly influenced by the saturation in its ferromagnetic core. Significant reductions in the values of the magnetizing reactances in both direct and quadrature axes from their corresponding unsaturated values have been observed as a result of nonlinearities introduced by saturation. Thus, in the modeling of electrical machines, proper representation of saturation in both direct and quadrature axes is of great importance for an accurate performance analysis. In this paper, a new method of modelling magnetic saturation in electrical machines has been proposed. A single equation, based on the measured parameters, has been used in this model to fit the saturation characteristics. The proposed method has been applied to model both d- and q-axis saturation characteristics of electrical machines of varying types and designs