Superconducting Rectangular Wire Coating for Quench-Resistant Coils
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Solution Overview
Problem
Conventional superconducting coils experience quenching due to insufficient adhesion between superconducting wires, leading to heat generation and breakdown of the superconducting state, even at currents below the critical value, which results in the evaporation of liquid helium.
Innovation Solution
A superconducting rectangular wire with an NbTi-based or Nb3Sn-based wire coated with a copper-based material, featuring a fusible resin layer with a thermoplastic resin and an insulating resin layer, where the radius of curvature of the fusible resin layer is controlled to be equal to or less than that of the wire, reducing the void ratio and enhancing adhesion and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a superconducting wire carries large currents, then the current carrying capacity is improved, but electromagnetic forces cause vibration and heat generation leading to quenching
Solution Approach 1:
The patent applies beforehand cushioning by providing a resin layer on the superconducting wire before winding into the coil. This resin layer acts as a protective cushion that prevents direct contact between adjacent wires, thereby preventing heat transfer and maintaining the superconducting state even when large currents generate electromagnetic forces and vibration. The resin layer is applied in advance during wire preparation, ensuring protection is in place before the coil operates under high current conditions.
2Strength
If resin layers are added to prevent interfacial separation, then the adhesion between components is improved, but the adhesion between superconducting wires remains insufficient causing quenching
Solution Approach 1:
The patent applies local quality by treating the surface of the superconducting wire with a resin coating specifically at the locations where wire-to-wire contact occurs during coil operation. Rather than uniformly thickening all resin layers, the invention focuses the adhesion enhancement on the critical contact points between adjacent superconducting wires. This localized approach ensures sufficient adhesion where needed most to prevent quenching, while maintaining the overall structural integrity provided by the multi-layer resin system.
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
The solution effectively suppresses quenching in superconducting coils by reducing the void ratio and improving adhesion between wires, thereby maintaining the superconducting state and preventing heat generation, even at high currents.
Implementation Method 1
a fusible resin layer including a thermoplastic fusible resin and coating an outer peripheral surface of the wire... enhancing adhesion between wires
Implementation Method 2
a fusible resin layer including a thermoplastic fusible resin... fusible resin layer has an average thickness of 0.005 mm or more and 0.100 mm or less
Data Source
AI summary
The superconducting rectangular wire for a superconducting coil, comprises: an NbTi-based or Nb3Sn-based wire having a surface coated with a copper-based material; and a fusible resin layer including a thermoplastic fusible resin and coating an outer peripheral surface of the wire, in which in a cross section of the superconducting rectangular wire for a superconducting coil, a radius of curvature (R2) of a corner portion of the fusible resin layer is equal to or less than a radius of curvature (R1) of a corner portion of the wire.