NDLI: High-Frequency Tunneling Magnetic Loss in Soft Ferrites

Content Provider	IEEE Xplore Digital Library
Author	Roshen, W.A.
Copyright Year	1965
Abstract	This paper considers high-frequency (200 kHz-1.0 MHz) losses in MnZn power ferrites and shows that none of the three well-known magnetic loss mechanisms (namely, hysteresis, classical eddy-current loss, and excess eddy-current loss) can account for the experimentally observed dependence of the loss on the frequency and flux density. In order to investigate the origin of this discrepancy, the electric field that is induced in the typical core when the material is driven at high frequencies and flux densities was estimated. The estimates show that these electric fields can be quite large. The paper presents experimental data on the electrical conductivity for such large electric fields, which shows a highly nonlinear behavior that can give rise to a modified eddy-current loss mechanism. By a simple curve fit to the nonlinear conductivity, the experimentally observed flux density dependence of the high-frequency loss, which previously could not be explained, can be reproduced by using this modified eddy-current loss mechanism. A modified ferrite structure can eliminate most of these extra losses by reducing the electric field generated at the grain boundaries due to high frequencies and flux densities
Sponsorship	IEEE Magnetics Society
Starting Page	968
Ending Page	973
Page Count	6
File Size	490297
File Format	PDF
ISSN	00189464
Volume Number	43
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic tunneling Soft magnetic materials Magnetic losses Ferrites Magnetic flux Frequency estimation Conductivity Magnetic hysteresis Magnetic cores Conducting materials power transformers Eddy currents electric fields ferrite devices ferrites ferromagnetic materials granular materials inductors losses magnetic losses power conversion power electronics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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