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Problems of loss separation for crystalline and consolidated amorphous soft magnetic materials

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5 Author(s)
Pfutzner, H. ; Inst. of Fundamentals & Theory of Electrotech., Univ. of Technol., Vienna, Austria ; Schonhuber, P. ; Erbil, B. ; Harasko, G.
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Losses were measured as a function of magnetization frequency fd for two advanced soft magnetic alloys: laser-scribed 0.23-mm HI-B steel ZDKH (designated HB) and consolidated amorphous Powercore (designated PC). Although domain observations on HB yielded distinct domain refinements due to the laser treatment, anomalous losses Wa still proved to be higher than the classical ones. A further refinement resulted from increasing f d. Thus, anomalous eddy current losses were reduced while hysteresis losses were increased. As a consequence, it is suggested to separate Wa into an eddy current component and a hysteresis component, which arises in addition to the classical hysteresis loss. With increasing fd, especially wide domains were refined. Results of loss measurements performed at high f after demagnetization with low f d indicated similar bar-type domain structures in HB and PC, the domain widths of the latter exceeding those of HB, however, by one order of magnitude. A Kerr-effect scanning technique confirmed the existence of an inner bar-type domain structure with domain widths of some millimeters

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 3 )