Measurement of losses in saturated solid magnetic cores

A new method of measuring the losses in saturated solid magnetic cores subjected to alternating magnetization is described. The method is based on the measurement of an alternative Poynting vector in the region between the surface of the iron core and the magnetizing winding. The two constituent components of this power-flow vector are the partial electric field and the magnetic field. A brief description of suitable probes for measuring these two field components and the associated measuring circuit is given. Loss measurements are made on two cores, a long rod, and a toroid; the results are compared with those calculated using analytical and numerical methods and also with those predicted by linear electromagnetic theory.