High-temperature AC superconducting magnets for a magnetic levitation system
AssigneeGrumman Aerospace Corporation
InventorSwarn S. Kalsi
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Abstract
An electromagnet for a MAGLEV system incorporates at least one superconducting coil, operating in AC mode, which surrounds a multiple-pole iron core and is constructed from a layer of epoxy-impregnated pancake coils assembled together along a common axis within a cryostat. The windings of each pancake coil may be constructed from predetermined lengths of Bi(2223) superconductor tape. The coil preferably operates at 77 K. but any temperature lying in a range of 5 K. to 80 K. may be used. Two- and six-pole/coil magnets operating in either AC or DC mode are specifically disclosed.
Claims18
An electromagnet, comprising:
- a magnetically-permeable core having a plurality of magnetic poles;
- and
- a plurality of superconducting coils made of a material capable of operating in AC mode, each of said coils surrounding a different one of said poles for inducing a magnetic field in said poles when current is supplied to said coils,
- wherein said superconducting coils operate in both AC and DC modes.
A superconducting coil made of a material capable of operating in AC mode, comprising;
- a winding pack including a predetermined number of pancake coils assembled together along a common axis, each of said pancake-coils having windings constructed from a preselected superconductor tape, said tape being of a type which demonstrates approximately zero AC losses at frequencies lying in a range between 0 HZ and 20 Hz,
- wherein said coil operates in both AC and DC modes.
Dependencies are inferred from the claim text.