Relation of eddy current losses with domain wall movement of very thin 3%Si-Fe strip-wound cores

The authors discuss the relation of eddy current losses to dynamic domain behavior for very thin 3%Si-Fe strip-wound cores up to 5 kHz. The dynamic domain behavior was observed by using scanning electron microscope. The stripe domain structure B₈, and H_c were recovered after the strip was wound into a core and annealed above 800°C. The wall bowing was negligible up to 1 kHz if the strip thickness was below 59 μm. On the basis of these experiments, the measured domain wall numbers were compared with the calculated ones from Vm/He. The eddy current losses were calculated by applying the observed domain wall numbers to the modified Pry and Bean model and compared with the measured ones. The measured eddy current losses agreed comparatively well with the calculated ones above 500 Hz. The same tendency was obtained in the comparison of the observed domain wall numbers with the calculated ones