A Method for Solving the Time-Periodic Electromagnetic Field Problem in Ferromagnetic Shielding

Autor: Iosif Nemoianu, Florea Ioan Hantila, Mihai Maricaru, Dan Rucinschi, Teodor Leuca
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Zdroj: Journal of Electrical and Electronics Engineering, Vol 2, Iss 1, Pp 83-86 (2009)
Druh dokumentu: article
ISSN: 1844-6035
Popis: Ferromagnetic shield is an efficient solution for shielding the static and periodic electromagnetic field. Therefore, it is also a shilding solution for an electromagnetic field having a rich contain of harmonics. Using the polarization fixed point method, the nonlinear media is replaced by a linear one having the vacuum permeability and a magnetization that is iteratively corrected by the flux density. For each harmonic of the magnetization, the electromagnetic field may be obtained by solving the sinusoidal steady-state eddy-current equation in the shield. The solution process can be started by retaining a small number of harmonics and, finaly, the acuracy of the solution may be improved with adding some more. The proposed method always yields to stable results, even when the characteristic B-H is strongly nonlinear, and has a superior computational efficiency with respect to various time-stepping techniques and to the “harmonic balance method”.
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