Active, Passive and Dynamic Shielding of Static and Low Frequency Magnetic Fields

Konferenz: ISTET 2009 - VXV International Symposium on Theoretical Engineering
22.06.2009 - 24.06.2009 in Lübeck, Germany

Tagungsband: ISTET 2009

Seiten: 5Sprache: EnglischTyp: PDF

Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt

Ziolkowski, Marcin; Gratkowski, Stanislaw (West Pomeranian University of Technology, Szczecin, Poland)

Three kinds of static and low-frequency magnetic fields shielding are known, namely, active, passive and dynamic. In this paper we discuss each of them, while a special emphasis is put on active shielding. Such a shielding uses coils with currents that generate magnetic fields of the same frequency and amplitude as the external field but in the opposite direction. From mathematical point of view these problems belong to ill posed nonlinear inverse problems and require special treatment. A method for designing a shape of the coils is given in the paper.