Tapered Superconducting Wire Connection Structure
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Solution Overview
Problem
Conventional superconducting wire connection methods lead to current flow concentration due to the skin effect, causing heat and deterioration of the superconducting layer, and are impractical for on-site applications or wires with non-removable surface metal layers.
Innovation Solution
A superconducting wire connection structure where tape-shaped wires with uniform widths and a substrate-laminated superconductive layer are connected by a third wire that tapers and is narrower than the connecting wires, with a solder layer ensuring stable superconductivity and reduced heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection superconducting wire is used to join superconducting wires by soldering or spot welding, then electrical connection is achieved, but current flow concentration occurs around ends of the connection superconducting wire due to skin effect, causing heat and deterioration of the superconducting layer
Solution Approach 1:
The connection superconducting wire is designed with non-uniform width, being narrower at its ends and wider in its intermediate portion. This local variation in geometry distributes the current flow more evenly along the wire, preventing concentration at the ends where skin effect would otherwise cause excessive current density and heat generation.
Solution Approach 2:
The width parameter of the connection superconducting wire is changed along its length, creating a tapered profile at the ends. This parameter change optimizes the current distribution by reducing the cross-sectional area at the ends where current concentration occurs, thereby reducing current density and heat generation in those critical regions.
2Reliability
If a superconducting film is deposited on the connection portion or surface metal layer is removed and redeposited, then connection is achieved, but it is hard to bring a deposition apparatus to a work site when adopted to applied apparatus
Solution Approach 1:
The connection superconducting wire is pre-formed with the optimal non-uniform width profile and ready-to-use configuration before reaching the work site. This preliminary preparation eliminates the need for on-site deposition apparatus or complex processing steps, allowing workers to simply install the pre-fabricated connection wire at the connection location.
Solution Approach 2:
The complex deposition process and apparatus are extracted from the on-site operation and replaced with a pre-fabricated connection wire that has already undergone the necessary manufacturing processes in a controlled environment. This separates the complex manufacturing steps from the simple installation task performed on-site.
3Ease of manufacture
If surface metal layer is removed to join connection superconducting wire, then connection is achieved, but superconductivity may be lowered by removal of the surface metal layer
Solution Approach 1:
The connection superconducting wire is pre-prepared with its superconductive layer and surface metal layer already in place during manufacturing. This preliminary preparation ensures that the wire maintains its full superconducting capability throughout the connection process without requiring removal of protective or functional layers at the connection site.
Solution Approach 2:
The connection superconducting wire is designed to serve multiple functions simultaneously: it provides electrical connection, maintains superconductivity, and preserves its surface metal layer for protection and current carrying capability. This multi-functionality eliminates the need to compromise superconductivity for connection purposes.
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
This method allows for easy and stable superconductivity connections by reducing current density and heat generation at the connection points, preventing deterioration of the superconducting layer and enabling on-site applications with various wire types.
Implementation Method 1
a solder layer which connects the first superconducting wire, the second superconducting wire and the third superconducting wire
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A superconducting wire connection structure is adopted in which, in a section where the ends of a first superconducting wire (11) and a second superconducting wire (12) are spaced apart from and arranged across from each other, the third superconducting wire (13), which is narrower in at least one portion than the first superconducting wire (11) and the second superconducting wire (12), spans and connects the first superconducting wire (11) and the second superconducting wire (12) along the longitudinal direction of the first superconducting wire (11) and second superconducting wire (12) . Thereby, it is possible to reduce degradation of the superconducting layer (3) by suppressing generation of heat caused by current flow concentration at the section where the third superconducting wire (13) is connected, and stable superconducting performance can be achieved.