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Three-Dimensional Analytical Modeling Technique of Electromagnetic Fields of Air-Cored Coils Surrounded by Different Ferromagnetic Boundaries

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4 Author(s)
Smeets, J.P.C. ; Eindhoven Univ. of Technol., Eindhoven, Netherlands ; Overboom, T.T. ; Jansen, J.W. ; Lomonova, E.A.

This paper presents a method for the calculation of the self- and mutual inductance of coils surrounded by air, positioned on top of a ferromagnetic plate and placed in a cavity inside a ferromagnetic plate. The magnetic fields around an array of air-cored coils are obtained by means of the three-dimensional magnetic vector potential using Fourier analysis. The current density distribution of a coil is modeled by four straight bars; three different configurations to position these bars against each other are presented as an alternative to model the round corners of a coil. An error of maximum 5% has been obtained in the analytically calculated flux density distribution compared to the values obtained from 3-D finite element simulations. Self- and mutual inductances are calculated for each current density description and compared with finite element simulations and measurements. A good agreement has been found for coils modeled by four overlapping or four trapezoidal bars.

Published in:

Magnetics, IEEE Transactions on  (Volume:49 ,  Issue: 12 )

Date of Publication:

Dec. 2013

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