Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1988-03-25
1989-03-14
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
361141, 335216, H01F 500
Patent
active
048127965
ABSTRACT:
A quench propagation device for a superconducting magnet having at least one pair of superconducting coils operates so that in the event of a transition to normal-conductance (quench) of a first coil of the coil pair, which up to that point was superconducting, the second coil of this pair is also converted from the superconducting operating state to the normal-conducting state using heating arrangements thermally connected to the coils. This device is constructed so that in the event of a quench rapid magnet de-excitation and uniform current distribution and, consequently force relationships, are achieved. The heating arrangements include two auxiliary windings magnetically closely coupled with their particular assigned coils of the coil pair. The auxiliary winding material is a discrete normal-conducting conductor having a predetermined specific electrical resistance. The two auxiliary windings are short-circuited with each other so that the direction of current flow in one auxiliary winding is opposite to the direction of current flow in the second auxiliary winding.
REFERENCES:
patent: 4486800 (1984-12-01), Franksen
patent: 4559576 (1985-12-01), Ries
IEEE Trans. Magn, MAG-17, Sep., 1981, pp. 1815-1822.
Proc. MT-6, 1977, pp. 654-662.
Proc. ICEC 6, pp. 492-496.
Harris George
Siemens Aktiengesellschaft
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