Superconducting compound stranded cable
AssigneeFurukawa Electric Co., Ltd.
InventorsYasuzo Tanaka, Yoshio Furuto
Life of this patent
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Abstract
A superconducting compound cable which comprises a plurality of strands each having therein at least one filament of a superconducting compound material in the lengthwise direction of the strand, said strands being of an elliptical or flat shape in cross section, arranged in layers and stranded at a predetermined pitch in the axial direction of the cable, and the total cross-sectional area of all the strands in the cable being more than 50 percent of that of the rectangle or trapezoid circumscribed about the periphery in a cross section of the cable.
Claims15
A superconducting compound cable, comprising a plurality of strands, at least one of said strands containing at least one filament of a brittle superconducting compound material extending longitudinally along the strand, each of said strands having two cross sectional dimensions transverse to the direction of the strand and transverse to each other, said strands being arranged in layers and stranded at a predetermined pitch in the axial direction of the cable, the total cross sectional area of all the strands of the cable accounting for more than 50 percent of that of a quadrilateral circumscribed about the periphery of the cross section of the cable, the stranding pitch P of the cable being in the range of 2 to 20 times the width W of the cable, the ratio of the width of the cable to the thickness t.sub.0 of the cable being in the range of 1 to 100, and the cable being constructed with the following relationship:
- t.sub.0 =2R.sub.0 .times..epsilon..sub.0 .times.(1+rW.sup.2 /P.sup.2)
- where R.sub.0 is the allowable bending radius of the cable which is a radius of curvature of the cable measured from the center of the curvature to a neutral interface of the cable, and .epsilon..sub.0 is the upper strain limit of the superconducting compound material within which the superconducting compound material does not degrade in superconducting characteristics.
A cable as in 1, wherein at least one of said strands includes a stabilizing metal or a reinforcing material or both.
A superconducting compound cable, comprising a plurality of strands, at least one of said strands containing at least one filament of a brittle superconducting compound material extending longitudinally along the strand, said strands being arranged in layers and stranded at a stranding pitch P in the range of 2 to 20 times the width W of the cable in the axial direction of the cable, the ratio of the width of the cable to the thickness t.sub.0 of the cable being in the range of 1 to 100, the cable being constructed with the following relationship:
- t.sub.0 =2R.sub.0 .times..epsilon..sub.0 .times.(1+4w.sup.2 /P.sup.2)
- where R.sub.0 is the allowable bending radius of the cable which is a radius of curvature of the cable measured from the center of the curvature to a neutral interface of the cable, and .epsilon..sub.0 is the upper strain limit of the superconducting compound material within which limit the superconducting compound material does not degrade in superconducting characteristics and the total cross sectional area of all the strands of the cable accounting for more than 50 percent of that of a quadrilateral circumscribed about the periphery of the cross section of the cable.
Dependencies are inferred from the claim text.