Determination of losses' local distribution for transformer optimal designing

This paper presents the development of a procedure for the determination of the local magnetic loss distribution in transformer cores. An efficient id entification method of the parameters of the Jiles-Atherton model is first described This method uses nonlinear optimization techniques and several ex perimental loops with different magnitudes, or measurements obtained with a low frequency supply signal, for a precise determination of the hysteresis model parameters. It is validated by the identification of two different k inds of magnetic materials: a standard laminated material made of 1008 stee l and a soft magnetic composite Atomet-EM1. The implementation of the hyste resis Jiles-Atherton model in a 2D field calculation tool is detailed. The field calculation procedure is illustrated by two application examples invo lving single phase tranformers with cores made of the soft magnetic composi te Atomet-EM1.