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

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1 Author(s)
Nitzan, D. ; Stanford Research Institute, Menlo Park, Calif.

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.

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Magnetics, IEEE Transactions on  (Volume:7 ,  Issue: 1 )