Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1994-10-17
1996-05-14
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335216, 324318, 324319, G01V 300
Patent
active
055171680
ABSTRACT:
A superconductive magnet with magnetic shielding has an annularly-cylindrical-shaped housing whose first end wall and outer cylindrical wall are magnetizable (e.g., iron) walls and whose inner cylindrical wall is a non-magnetizable wall. At least one main superconductive coil is positioned within the housing and carries an electric current in a first (e.g., clockwise) direction. A first resistive (e.g., copper) deflection coil is positioned outside the housing radially proximate the outer cylindrical wall and longitudinally closer to the first end wall than to a midpoint located between the two end walls. The first deflection coil carries an electric current in an opposite direction to the first direction so that its magnetic field longitudinally pushes the stray magnetic field of the superconductive coil(s), which leaves the magnet's bore, inward to be captured by the iron first end wall.
REFERENCES:
patent: 4724412 (1988-02-01), Kalafala
patent: 4924198 (1990-05-01), Laskaris
patent: 5237300 (1993-08-01), Ige et al.
patent: 5291169 (1994-03-01), Ige et al.
patent: 5309106 (1994-05-01), Miyajima et al.
"Open MRI Magnet with Superconductive Shielding", by E. T. Laskaris, U.S. Patent Application Ser. No. 08/260,433, filed Jun. 15, 1994.
See "Background of Invention" of present patent application.
Concurrently filed patent application RD-23587, "Superconducting Magnet with Magnetic Shielding", by E. T. Laskaris et al.
Dorri Bizhan
Laskaris Evangelos T.
Ogle Michele D.
Barrera Raymond M.
Erickson Douglas E.
General Electric Company
Picard Leo P.
Webb II Paul R.
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