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Magnetic field generating assembly

  • US 4,968,915 A
  • Filed: 06/15/1989
  • Issued: 11/06/1990
  • Est. Priority Date: 01/22/1987
  • Status: Expired due to Term
First Claim
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1. An assembly for generating a magnetic field within a volume, said assembly including a hollow substantially tubular ferro-magnetic shield with axial ends, a first magnetic field generating means, and second magnetic field generating means, said volume being defined by the ferro-magnetic material of the shield and the hollow space within the shield, said first magnetic field generating means positioned within said ferro-magnetic shield and positioned and adapted to generate substantially all of said magnetic field within said volume, said second magnetic field generating means comprising a first set of auxiliary coils mounted around and along said shield and connected in series with said first magnetic field generating means and a second set of auxiliary coils mounted at opposite axial ends of the shield, said second magnetic field generating means positioned substantially about and along said tubular shield and further positioned and adapted so as to guide magnetic flux of said magnetic field leaking from said volume back into said volume so as to optimize the quantity of flux from said first magnetic field generating means which is guided through said shield.

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