NDLI: Accounting for resistivity and permittivity in high frequency permeability measurements: application to MnZn ferrites

Content Provider	IEEE Xplore Digital Library
Author	Keradec, J.P. Fouassier, P. Cogitore, B. Blache, F.
Copyright Year	2003
Description	Author affiliation: Lab. d'Electrotechnique de Grenoble, INPG/UJF, Saint-Martin-D'Heres, France (Keradec, J.P.)
Abstract	A careful look to methods used by manufacturers to measure the permeability of soft magnetic material let appears that these data are not reliable when induced currents flow in the magnetic material leading to a screening effect. This is obviously the case of bulk cast iron as soon as eddy currents flows inside. It is also applicable to MnZn ferrites because, beyond 100 kHz, they are gone through by both conduction currents due to their finite resistivity and displacement currents related to their very high permittivity. In both cases, flux density is not uniform on the core cross section. In this paper, we present an original method which allows, at every frequency, simultaneous evaluation of both complex permeability and permittivity (which accounts for resistivity). Completing the traditional inductance measurement by a capacitance one, enough experimental data are acquired, at every frequency, to deduce the two complex parameters. The material is assumed to behave linearly but, owing to special experimental care, no other hypothesis is needed. This method has proven to be reliable up to 10 MHz and, above some 100 kHz, obtained permeability shows significant differences with that measured traditionally. Contrary to traditional specifications, obtained parameters suit to design new core shapes intended to work in the 100 kHz-10 MHz range.
Sponsorship	IEEE Instrum. & Meas. Soc
Starting Page	1252
Ending Page	1256
File Size	311095
Page Count	5
File Format	PDF
ISBN	0780377052
ISSN	10915281
DOI	10.1109/IMTC.2003.1207952
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity Frequency Permeability measurement Ferrites Manufacturing Current measurement Permittivity measurement Fluid flow measurement Soft magnetic materials Materials reliability
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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