Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1994-07-27
1996-07-23
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
324318, 324320, 324319, 335216, H01F 300, G01V 300
Patent
active
055393667
ABSTRACT:
A magnet including spaced-apart first and second pole pieces with generally opposing first and second pole faces. The first pole face has an axis extending generally towards the second pole face and has a surface region which includes at least two frustoconical surfaces. The frustoconical surfaces are generally coaxially aligned about the axis, and radially-adjacent frustoconical surfaces abut each other. In a second embodiment, points on the surface region located an identical radial distance from the axis are also located a common axial distance along the axis, and a graph of axial distance along the axis versus radial distance from the axis for such points is a curve having a continuous slope with at least two sign reversals. Such contoured pole faces allow for a smoother magnetic field to better reduce axisymmetric magnetic field inhomogeneity.
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Concurrently filed patent application RD-23784, by Bizhan Dorri et al., entitled "Magnet Having Pole Faces With Trapezoidal-Shaped Shims".
U.S. Patent Application Docket No. RD-23769FW, filed on or about Jul. 11, 1994, (Ser. No. not yet received) by M. V. Chari, entitled "Open (Non-Enclosed) Magnets For Magnetic Resonance Imaging".
U.S. Patent Application Serial No. 08/067,183, filed May 26, 1993, by Dorri et al., entitled "Pole Face Design For A C-Shaped Superconducting Magnet".
Dorri Bizhan
Laskaris Evangelos T.
Ogle Michele D.
Xu Bu-Xin
Barrera Raymond M.
Freedman Irving M.
General Electric Company
Picard Leo P.
Pilarski John H.
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