A simplified method for the iron losses prediction in soft magnetic materials with arbitrary voltage supply

The aim of this work is to propose a new approach for the iron losses prediction, in soft magnetic materials with any voltage supply, starting from the knowledge of the iron losses with sinusoidal supply. The model is based on the separation of the loss contributions due to hysteresis, eddy currents and excess losses with sinusoidal supply. Since any contribution depends on the voltage supply characteristics, it is possible to find a direct mathematical relationship between the iron loss contribution and the voltage supply characteristics. As a consequence, an iron loss prediction can be obtained with any voltage supply, which does not produce hysteresis minor loop. The energetic model is based on coefficients that depend on the material characteristic. An accurate analysis of the model on eight magnetic materials, of different thickness and alloy, has been made, so the main coefficients for a large spread of magnetic materials, used for the electrical machines construction, have been found. The paper can be a useful support for electrical machine designers when the energetic performances of magnetic material, have to be predicted with the voltage supply different from the sinusoidal one