Superconducting system and method for controlling the same

Details Superconducting system and method for controlling the same Superconducting system and method for controlling the same

1986-07-17

1987-12-15

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including superconductivity

H01H 4700

Patent

active

047137223

ABSTRACT:
A superconducting system including a superconductive coil and a perpetual current switch connected in parallel therewith in a cryogenic vessel, wherein the perpetual current switch includes a superconductive lead and a heater that causes the superconductive lead to be normal-conductive; and a DC power source that can arbitrarily change the output thereof with respect to the superconductive coil and the perpetual current switch. The system circulates a current of a specified amount within a closed loop constituted by the superconductive coil and the superconductive lead so as to create a perpetual current loop. The system further includes a reference generator unit provided with a current reference value that has a first sweep gradient and changes the superconductive coil current, an established current value such that the superconductive coil current is caused to reach a specified target value, a current reference value that has a second sweep gradient and does not change the superconductive coil current after the arrival thereof at the target value but changes currents that respectively flow into the DC power source and the superconductive lead; and a timing control unit that switches with specified changeover timings the two current reference values and the heater-energizing periods.

REFERENCES:
patent: 3848162 (1974-11-01), Ichikawa et al.

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