Reduced AC losses in HTS coated conductors
AssigneeThe Regents of the University of California
InventorStephen P. Ashworth
Life of this patent
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Abstract
Methods for reducing hysteresis losses in superconductor coated ribbons where a flux distribution is set into the superconductor coated ribbon prior to the application of alternating current.
Claims15
A method of reducing hysteresis losses in a superconductor coated ribbon having a critical current comprising the steps of:
- establishing a transport electrical current greater than said critical current in said superconductor coated ribbon for a period of time sufficient to establish pinning of flux lines within said superconductor coated ribbon;
- whereby hysteresis losses in said superconductor coated ribbon are reduced.
A method of reducing hysteresis losses in a superconductor coated ribbon having a face and a critical temperature comprising the steps of:
- applying a magnetic field to said superconductor coated ribbon in a direction perpendicular to said face;
- and
- cooling said superconductor coated ribbbon to a temperature below said critical temperature;
- whereby a magnetic flux distribution is established inside said superconductor coated ribbon reducing said hysteresis losses in said superconductor coated ribbon.
A method of reducing hysteresis losses in a superconductor coated ribbon having a face and a critical temperature comprising the steps of:
- cooling said superconductor coated ribbon to a temperature lower than said critical temperature;
- and
- applying a magnetic field to said superconductor coated ribbon in a direction perpendicular to said face;
- whereby a magnetic flux distribution is established inside said superconductor coated ribbons and said hysteresis losses in said superconductor coated ribbon are reduced.
A method of reducing hysteresis losses in a superconductor coated ribbon deposited onto a metallic substrate and having a critical temperature comprising the steps of:
- applying a direct current magnetic field to said superconductor coated superconductor ribbon;
- and
- cooling said superconductor coated ribbon to a temperature below said critical temperature;
- whereby a magnetic field distribution is established inside said superconductor coated ribbon and said hysteresis losses in said superconductor coated ribbon are reduced.
A method of reducing hysteresis losses in superconductor coated ribbon having a transition temperature comprising the steps of:
- winding an electrical conductor around said superconductor coated ribbon;
- passing a direct current through said electrical conductor;
- and
- cooling said superconductor coated ribbon to below said critical temperature;
- whereby a magnetic field distribution is established inside said superconductor coated ribbon and said hysteresis losses in said superconductor coated ribbon is reduced.
Dependencies are inferred from the claim text.