Current limiting device for electromagnetic coil employing gap c

Details Current limiting device for electromagnetic coil employing gap c Current limiting device for electromagnetic coil employing gap c

1991-12-20

1994-10-11

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including superconductivity

307306, 323360, 336DIG1, 361 19, 361 58, H03K 1792

Patent

active

053552750

ABSTRACT:
A variable impedance device comprises a coil (10) and an associated magnetic circuit (16) having a gap receiving a plate (20) of superconducting material which acts as a shield or barrier so that, while the plate (20) is in its superconducting state, magnetic flux is caused to traverse the gap via pathways substantially greater in length than the width of the gap. If a large current is passed through the coil (10), the plate (20) becomes resistive thereby presenting a substantially increased impedance to the current. The device may be used in current limiting applications, or other applications where a variable impedance is required.

REFERENCES:
patent: 3091702 (1963-05-01), Slade
patent: 4942378 (1990-07-01), Barber
patent: 5023230 (1991-06-01), Cheng
patent: 5250508 (1993-10-01), Pham
Patent Abstracts of Japan, vol. 13, No. 421 (E-822)(3769) Sep. 19, 1989 & JP-A-1157227 (Matsushita Elec. Works).
Patent Abstracts of Japan, vol. 13, No. 513 (E-847)(3861) Nov. 16, 1989 & JP-A-1206831 (Mitsubishi Cable Ind).
Patent Abstracts of Japan, vol. 13, No. 271 (P-889) Jun. 22, 1989 & JP-A-1062809 (Furukawa Elec. Co.).

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