Superconducting Wire Electrode Joining Structure
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Solution Overview
Problem
Superconducting coils experience normal conduction transitions and potential burning due to temperature increases near electrodes, caused by heat dissipation and external heat permeation, leading to instability and failure.
Innovation Solution
The electrode unit joining structure for superconducting wires includes a buffering member to fill the gap between the wire, cover tape, and electrode, with electrical connection through solder, and a superconducting cover tape that covers the electrode, reducing contact resistance and facilitating effective cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode is directly connected to the superconducting wire, then electrical connection is achieved, but temperature increases near the electrode cause normal conduction transitions
Solution Approach 1:
The electrode connection structure is divided into multiple segments: the electrode itself, the electroconductive layer for electrical connection, the insulating layer for electrical isolation, and the buffering member for mechanical stress absorption. This segmentation allows each component to perform its specific function while preventing temperature-induced normal conduction transitions in the superconducting wire.
Solution Approach 2:
The buffering member acts as an intermediary between the electrode and the superconducting wire, filling the gap and absorbing mechanical stresses. The insulating layer serves as an intermediary to prevent direct electrical contact while allowing thermal management. These intermediary components protect the superconducting wire from temperature increases caused by direct electrode connection.
2Reliability
If the electrode is made larger to reduce contact resistance, then electrical connection improves, but heat dissipation increases causing temperature rise
Solution Approach 1:
The electroconductive layer is applied locally to the electrode surface in contact with the superconducting wire, providing low contact resistance only where needed. The insulating layer is applied to other surfaces to prevent unwanted electrical contact and manage heat dissipation. This local differentiation of properties allows optimized electrical connection without excessive heat generation.
3Ease of manufacture
If mechanical stress is applied to the superconducting wire during coil winding, then coil formation is achieved, but the wire may transition to normal conduction state
Solution Approach 1:
The buffering member is pre-installed between the electrode and the superconducting wire to provide mechanical cushioning before coil winding begins. This beforehand cushioning protects the superconducting wire from excessive mechanical stresses during the coil formation process, preventing normal conduction transitions while allowing necessary deformation for coil winding.
Solution Approach 2:
The connection structure uses composite materials with different properties: the electroconductive layer for electrical conductivity, the insulating layer for electrical isolation and thermal management, and the buffering member for mechanical compliance. This composite structure allows the coil to be wound with appropriate mechanical stress while maintaining superconducting state stability.
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 configuration suppresses temperature increases near the electrodes, prevents normal conduction transitions, and enhances mechanical stability, thereby preventing burning and maintaining the superconducting state.
Implementation Method 1
the electrode, the superconducting wire, and the superconducting cover tape are electrically connected to each other
Implementation Method 2
heat dissipation at a connection portion
Implementation Method 3
heat permeating from the outside
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
An electrode unit joining structure for a superconducting wire includes: a superconducting wire comprising a first base member, a first superconducting layer provided on the first base member, and a first electroconductive layer provided on the first superconducting layer; an electrode provided on the first electroconductive layer at an end portion of the superconducting wire; and a superconducting cover tape comprising a second base member, a second superconducting layer provided on the second base member, and a second electroconductive layer provided on the second superconducting layer, the superconducting cover tape being provided so as to cover at least part of the electrode, wherein the second electroconductive layer of the superconducting cover tape is disposed on the electrode side, and the electrode, the superconducting wire, and the superconducting cover tape are electrically connected to each other.