Computation and modeling of eddy currents in tape-wound square-loop cores

Author

Nitzan, David

Author_Institution

Stanford Research Institute, Menlo Park, Calif.

Volume

Issue

fYear

1971

fDate

3/1/1971 12:00:00 AM

Firstpage

185

Lastpage

197

Abstract

Eddy currents in tape-wound cores are classified into microscopic and macroscopic eddy currents. The latter, denoted by ie, exists during mode II among three switching modes. Inherent peak $\\dot{\\phi}$ versus $F$ for a high $F = F_{D}$ drive is computed from measured $\\dot{\\phi}_{m}(F_{D})$ and $\\phi_{m}(F_{D})$ , the $\\dot{\\phi}$ and φ when $\\dot{\\phi}$ is maximum. The expected line density of reversed-domain nucleation centers is computed from $\\phi_{m}(F_{D})$ . A switching tape-wound core is equivalent to one with "ferrite-core" characteristics that is loaded by a resistance $R_{e} = \\dot{\\phi}/i_{e}$ . A special computer program was developed to compute $i_{e}(\\phi,F_{D})$ and $R_{e}(\\phi,F_{D})$ , the higher FD, the wider and lower the resulting U shaped $R_{e}(\\phi)$ . Domain-pattern models are proposed. Accordingly, $n_{p}(\\phi,F_{D})$ domains in which $\\phi \\cdot p(\\phi,F_{D})$ is generated are encircled by macroscopic eddy currents where $n_{p} \\geq 0$ and $1 \\geq p \\geq 0$ . The semiempirical model $R_{e}(\\phi,F_{D}) = R_{ez}(F_{D})/{1 - [\\phi/\\phi_{m}(F_{D})]}$ , where Rezis Reat $\\phi = 0$ , is proposed. The functions describing $\\phi_{m}(F_{D})$ and $R_{ez}(F_{D})$ include a total of five parameters besides.

Keywords

Eddy currents; Magnetic cores; Magnetic switching; Square-loop magnetic materials; Computational modeling; Eddy currents; Electrons; Magnetic analysis; Magnetic cores; Magnetic sensors; Magnetometers; Microscopy; Network address translation; Stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1971.1067001

Filename

1067001

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1045567