Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1997-12-05
1999-08-10
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335300, H01F 500
Patent
active
059365021
ABSTRACT:
An MR imaging apparatus includes a magnet assembly having two generally opposed pole pieces. Current flowing in driver coils associated with each pole pieces generates a magnetic field in the imaging region. The driver coils include a conductor having beveled edges, the conductor being wound in a spiral fashion. A layer of electrical insulation is located between the conductor windings. A cooling member fabricated from bifilar wound tubing having a generally rectangular cross section is in thermal communication with each driver coil. Coolant flowing through the cooling member removes heat generated in the driver coils.
REFERENCES:
patent: 4667174 (1987-05-01), MacKinnon et al.
patent: 5173678 (1992-12-01), Bellows et al.
patent: 5554929 (1996-09-01), Doty et al.
Englund Rurik B.
Kinanen IImari V.
Lindholm Jan-Erik M.
Donovan Lincoln
Fry John J.
Gurin Timothy B.
Picker Nordstar Inc.
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