Charts for estimating the axial shielding factors for triple-shell open-ended cylindrical shields

Eugene Paperno, Hiroyuki Koide, Ichiro Sasada

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


Describing the shields with the number of shells greater than two differs from the previously done work in having a significant increase in the number of charts needed. To limit the number of charts, only the shields were examined that have the most-used exterior aspect ratio, namely, equal to 5. It was also assumed that all the shielding shells are made of the same material with an equal and relatively small thickness, which is a practical case as well. Since the three-shell structure does not allow much freedom for variations in the air gaps between the shells, only the shields having air gaps of 5% and 10% of the diameter of the outermost shell were considered. Finally, a set of charts was computed with the help of a standard ANSYS® software employing an FEM method. The charts are represented as logarithmic contour plots where the ratio of the inner to outer shells' lengths and permeability normalized to the thickness-to-diameter ratio of the outermost shell are independent variables; and the air gaps and ratio of the middle to outer shells' lengths are fixed parameters. The charts calculated allow one to quickly estimate the axial shielding factor and to clearly observe the effect of the shield's parameters on the axial shielding.

Original languageEnglish
Pages (from-to)2881-2883
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 I
Publication statusPublished - Jul 2001
Event8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States
Duration: Jan 7 2001Jan 11 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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