Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including superconductivity
Patent
1987-09-03
1988-08-09
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including superconductivity
361 19, 335216, H02H 700
Patent
active
047632216
ABSTRACT:
A superconducting magnet apparatus comprises an emergency run down unit having a heater power source and a heater circuit switch, a superconducting coil, and a persistent current switch circuit, the persistent current switch connected in parallel to the superconducting coil and including a first persistent current switch connected in parallel to a first protective element of low resistance and a second persistent current switch connected in parallel to a second protective element of high resistance. The second persistent current switch has a persistent switch-heater connected to the heater power source through the heater circuit switch. Thus, when it becomes necessary to demagnetize the superconducting magnet apparatus being operated in a persistent current mode, the second persistent current switch parallel to the second protective element of high resistance is opened, whereby current flowing through the superconducting magnet decays rapidly.
REFERENCES:
patent: 3513421 (1970-05-01), Schindler et al.
patent: 4535291 (1985-08-01), Lee et al.
Gray David M.
Hix L. T,.
Mitsubishi Denki & Kabushiki Kaisha
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