Accession Number : AD1036080


Title :   Using Ferromagnetic Material to Extend and Shield the Magnetic Field of a Coil


Descriptive Note : Technical Report,07 Jan 2013,30 Jan 2014


Corporate Author : U.S. Army Research Laboratory Aberdeen Proving Ground United States


Personal Author(s) : Uhlig,W C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1036080.pdf


Report Date : 14 Jun 2017


Pagination or Media Count : 16


Abstract : This report proposes to extend the magnetic field generated by a coil along its axial direction while simultaneously shielding (or reducing) the field in the lateral direction by the application of ferromagnetic cladding on the coil. Calculations were performed for an infinitely long wire with a 2.5- x 5.0-cm rectangular cross section carrying 607,000 A as well as a magnetically saturated 2.5- x 5.0-cm rectangular piece of iron with a length much greater than the cross-sectional dimensions. These fields were combined as a baseline representative value. Two-dimensional calculations were then performed for a single-turn coil with a 20-cm diameter, metal cladding of varying permeability of mu(sub o), 10 mu(sub o), and 50 mu(sub o), and cross sections identical to the previous infinite wire and iron calculations. The field at the coil edge along the axial direction was extended up to 10 percent, while the field outside the coil in the radial direction was reduced by an order of magnitude, particularly within close proximity of the cladding.


Descriptors :   magnetic fields , ferromagnetic materials , MAGNET COILS


Subject Categories : Properties of Metals and Alloys
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE