Process for reducing eddy currents in a superconductor strip, an

Details Process for reducing eddy currents in a superconductor strip, an Process for reducing eddy currents in a superconductor strip, an

1990-06-13

1991-08-06

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

1741251, 505 1, H01F 722

Patent

active

050381270

ABSTRACT:
An arrangement of electrically anisotropic high-temperature superconductors (A1, A2) on a non-superconducting metal strip (1) for alternating-current applications, such as magnets and electrical machines, is specified in the case of which a relatively simple reduction of alternating-current losses is achieved in that at least one strip (A1, A2), deposited as a layer, made of a high-temperature superconductor, spirally surrounds this metal strip. The superconducting strip (A1, A2) has a preferred direction in which the critical current density is smaller than in all other directions. In this arrangement, a current (i) flowing through the superconductor flows periodically through regions of the superconductor (A1, A2) that are oriented in the preferred direction and twisted by 180.degree. thereto. These periodic regions limit the length of the eddy currents.
Instead of a spiral winding (A1, A2), it is also possible to use, especially for power cables, a two-layer conductor with grooves and webs arranged periodically along the current direction, in the case of which grooves and webs the current direction, in the case of which grooves and webs the current must alternate periodically from one into the other layer.

REFERENCES:
patent: 4851799 (1989-07-01), Hilal
patent: 4873503 (1989-10-01), Mansfield

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