Composite Superconducting Tape Layout for Defect Bypassing
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Solution Overview
Problem
Existing superconducting tapes, particularly ReBCO tapes, face challenges in current distribution and sharing, especially in large-scale magnets, due to the high-resistance layer limiting current redistribution and distribution paths, and traditional joints cause mechanical property variations.
Innovation Solution
A composite superconducting tape structure with misaligned superconducting tapes and conductive tapes, allowing for a wide low-resistance current path and defect bypassing, and a method for joint connection that maintains mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-direction current sharing through high-conductivity layer is used, then current distribution is achieved in one direction, but current redistribution in other directions is limited
Solution Approach 1:
The patent transitions from single-direction current sharing to multi-directional current distribution by arranging superconducting tapes in a two-dimensional grid pattern with conductive tapes forming a network structure. This allows current to redistribute not only along the length of individual tapes but also laterally across the entire cable cross-section through the conductive tape network, effectively adding spatial dimensions to current distribution pathways.
Solution Approach 2:
The conductive tapes serve as intermediary elements that facilitate current transfer between adjacent superconducting tapes. These conductive tapes form a network structure that acts as a mediator, enabling current to flow laterally from high-current-density regions to low-current-density regions, thus achieving balanced current distribution across multiple directions without requiring changes to the superconducting tapes themselves.
2Ease of operation
If multiple superconducting tapes are stacked in twisted or wound configurations, then cable flexibility is improved, but current distribution becomes more difficult
Solution Approach 1:
The conductive tapes are pre-positioned and bonded to the superconducting tapes before the cable is twisted or wound into its final configuration. This preliminary arrangement of conductive pathways ensures that current distribution capability is established in advance, allowing the cable to maintain effective current sharing even when subsequently deformed into complex three-dimensional configurations such as twisted stacks or wound coils.
3Length of moving object
If joints are used to extend superconducting tape length, then continuous long tapes are achieved, but mechanical property variations occur at joint locations
Solution Approach 1:
Conductive tapes serve as intermediary connection elements at joint locations, providing a transition zone that bridges discontinuities in the superconducting tapes. These conductive intermediaries allow current to bypass defective or jointed sections while maintaining electrical continuity, and their flexible nature accommodates mechanical property variations without creating stress concentration points that would compromise overall cable integrity.
4Strength
If high-resistance insulating buffer layer is used to protect superconducting layer, then superconducting layer protection is improved, but current sharing between tapes is limited
Solution Approach 1:
The conductive tapes act as intermediary current pathways that bypass the high-resistance insulating buffer layers. By providing dedicated low-resistance conductive connections between adjacent superconducting tapes, the system overcomes the current isolation effect of the buffer layers, enabling effective current sharing while the buffer layers continue to provide their protective function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances current redistribution and mechanical stability, enabling longer continuous tapes and improved yield rates by providing a wide low-resistance path and defect bypassing without thickness or mechanical property variations.
Implementation Method 1
the rare-earth barium copper oxide (ReBCO) superconducting tape mainly includes a superconducting layer
Implementation Method 2
a high-conductivity metal protective layer made of copper/silver (high-conductivity layer)
Data Source
AI summary
A composite superconducting tape, a combination and preparation method thereof, and a defect bypassing or an end joint connection method. The composite superconducting tape includes a plurality of superconducting tapes, including a first superconducting tape and a second superconducting tape. The first superconducting tape includes a first superconducting layer, and the second superconducting tape includes a second superconducting layer. A side of the first superconducting tape close to the first superconducting layer is bonded with a side of the second superconducting tape close to the second superconducting layer along a length direction. The first superconducting tape is misaligned with the second superconducting tape along a width direction, such that the side of the first superconducting tape has a first vacant area for bonding with a second conductive tape, and the side of the second superconducting tape has a second vacant area for bonding with the first conductive tape.