Superconducting Wire Bobbin Structure With Curved Cooling Channels
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Solution Overview
Problem
Conventional bobbin structures for winding superconducting wire rods suffer from deterioration of mechanical properties and uniformity of electromagnetic force distribution due to shrinkage and expansion during quenching, and lack effective temperature uniformity and cooling channels, which are critical for maintaining the performance of superconducting fault current limiters.
Innovation Solution
A bobbin structure with a base plate and protruding structures that provide a minimum radius of curvature for mechanical stability and uniformity, along with a cooling channel system using arc-shaped extensions and concavo-convex portions to ensure optimal cooling efficiency, allowing for the secure winding of superconducting wire rods and efficient cryogenic fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the superconducting wire rod is wound on an elliptical bobbin to achieve compact size, then the bobbin occupies less space, but the wire rod experiences shrinkage and expansion during quenching that deteriorates mechanical properties and electromagnetic force distribution uniformity
Solution Approach 1:
The patent employs a circular bobbin geometry instead of an elliptical one, ensuring that the superconducting wire rod maintains a constant radius of curvature throughout the winding. This circular configuration prevents localized stress concentrations that occur in elliptical designs, thereby preserving mechanical properties and electromagnetic force distribution uniformity during quenching while achieving compact size through optimized circular geometry.
2Volume of moving object
If the superconducting wire rod is wound on an elliptical bobbin to achieve compact size, then the bobbin occupies less space, but the electromagnetic force distribution uniformity deteriorates due to shrinkage and expansion
Solution Approach 1:
The circular bobbin design ensures uniform radius of curvature for the superconducting wire rod, which maintains consistent electromagnetic force distribution during quenching. The circular geometry prevents the shrinkage and expansion effects that occur in elliptical designs, thereby preserving electromagnetic force distribution uniformity while achieving compact dimensions through optimized circular geometry.
3Reliability
If insulating tape is wrapped around the superconducting wire rod to maintain insulation between rods, then insulation is maintained, but the core condition of maintaining constant temperature in the longitudinal direction cannot be satisfied
Solution Approach 1:
The patent removes the insulating tape from the superconducting wire rod surface, eliminating the thermal barrier that prevents effective cooling. Instead, insulation is maintained through alternative means (such as insulation between turns or using insulated support structures) that do not interfere with thermal contact to the bobbin cooling channels, thereby preserving both insulation reliability and temperature uniformity.
Solution Approach 2:
The patent introduces a thermal coupling mechanism between the wire rod and bobbin cooling channels that acts as an intermediary for heat transfer. This allows efficient thermal conduction along the longitudinal direction while maintaining electrical insulation through the bobbin structure itself or supporting insulation structures that conduct heat effectively.
4Loss of energy
If the superconducting wire rod is wound in a bifilar form to minimize AC loss, then AC loss is reduced, but the cooling channel configuration becomes critical for maintaining temperature uniformity
Solution Approach 1:
The circular bobbin geometry ensures that bifilar-wound superconducting wire rods maintain uniform radius of curvature and consistent spacing between adjacent turns. This uniform configuration optimizes the cooling channel effectiveness by ensuring even heat distribution to all parts of the wire rod, thereby maintaining temperature uniformity while preserving the AC loss reduction benefits of bifilar winding.
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 proposed bobbin structure minimizes mechanical property deterioration and ensures uniform electromagnetic force distribution, while providing enhanced cooling efficiency and weight reduction, thereby optimizing the performance of superconducting fault current limiters by maintaining temperature uniformity and reducing cooling loads.
Implementation Method 1
securing a cooling channel required for cooling the superconducting wire rod
Implementation Method 2
efficient cryogenic fluid flow
Implementation Method 3
shrinkage and expansion during quenching of the wound superconducting wire rod
Implementation Method 4
nonlinear voltage-current characteristics of this new element has emerged
Data Source
AI summary
Disclosed is a bobbin structure for winding a superconducting wired rod, which can secure a minimum radius of curvature that can prevent a deterioration in mechanical properties and a decrease in the uniformity of electromagnetic force distribution, due to contraction and expansion acting on the wire rod during quenching of the superconducting wire rod, and which also can ensure uniformity of temperature over all portions of the superconducting wire rod by securing a cooling channel required for cooling of the superconducting wire rod.