Mobile QR Code QR CODE : Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
Title The Magnetic Shield Effect of a Close-Ended Shield Can
Authors Young-Hak Kim
DOI http://dx.doi.org/10.5207/JIEIE.2018.32.10.039
Page pp.39-45
ISSN 1225-1135
Keywords Magnetic Shield ; Shield Can ; Flat Cap ; Demagnetization ; Permalloy ; Permeability ; FEM
Abstract Permeabilities of 3,000 and 50,000 were experimentally obtained through inductance measurement for a butt-welded and a filltet-welded permalloy ring cores. And the value range of 3,000-50,000 was assigned as a material constant to calculate the inside axial magnetic fields in the FEM analysis of 4-layered magnetic shield cans. While open-ended shield can had the optimum length according to the assigned permeabilities, flat cap-ended shield can did not show the dependence on the length of the inside layers of shield can. And flat cap-ended shield can exhibited a good advantage as compared with open-ended shield can because demagnetization could be sufficiently weakened by using flat-caps. As permeability was high, the axial magnetic field was small in the flat cap-ended shield can. And flat cap-ended shield can could be easily designed without considering the optimum length and permeability variety of inside layers.