WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 15, 2016
Leakage Flux Analysis in Toroidal Core with Circular Cross Section Based on Analytic Calculation
Authors: , ,
Abstract: It is important to understand the leakage flux distributions of toroidal core under the condition of the coil is wound partially on the surface of the core, and the magnetic permeability is not very large. In this paper, formulas of the electrical field intensity and magnetic field intensity in toroidal core with circular cross section are derived, as the leakage fluxes to be considered. The formula of eddy-current power losses are also derived based on the electrical field intensity formula. The calculated results of the eddy-current power losses are in good agreement with the formula which is derived from the self impedance of coil. Effects of frequency, magnetic permeability and distribution of windings on leakage fluxes are analyzed. The results show the formulas accurately predicted the case when magnetic permeability of the core is very large or the coil is wound densely and uniformly on the surface of the core, the leakage fluxes are very small and can be neglected. Magnetic fluxes decreases with frequency increasing , while the proportion of leakage fluxes increase with frequency increasing. It has been shown that leakage fluxes limit the upper frequency of operation.
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Keywords: toroidal core, electromagnetic field distributions, leakage fluxes, eddy-current power losses
Pages: 1-8
WSEAS Transactions on Circuits and Systems, ISSN / E-ISSN: 1109-2734 / 2224-266X, Volume 15, 2016, Art. #1