Superconducting Coil Peel Force Management
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Solution Overview
Problem
Superconducting coils experience degradation of superconducting characteristics due to peel forces generated during cooling, caused by the anisotropy of the coefficient of linear expansion between the core and the superconducting tape wire, leading to instability as the diameter ratio of the coil increases, potentially exceeding the allowable stress of the tape wire.
Innovation Solution
A superconducting coil with a multilayer structure is designed, featuring concentric coil layers with reduced adhesive force at boundary portions, using a thin-film superconducting wire and insulating material, which are wound into non-circular or circular shapes to manage the peel force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the superconducting coil is wound with high adhesive force between layers, then the coil structure is strong, but the peel force exceeds the allowable stress of the superconducting tape wire during cooling
Solution Approach 1:
The patent applies different adhesive forces at different locations: strong adhesive force at the innermost turn (first coil layer) to prevent peeling during cooling, and weak adhesive force at boundary portions between concentric coil layers to allow controlled relative movement and reduce peel force. This local differentiation resolves the contradiction between structural strength and peel force reduction.
2Volume of moving object
If the diameter ratio of the superconducting coil is increased, then the coil size is larger for practical applications, but the peel force generated in the coil increases and may exceed allowable stress
Solution Approach 1:
The patent segments the coil structure into multiple concentric coil layers with controlled adhesive forces at their boundaries. This segmentation allows each layer to manage peel forces independently, enabling larger coil sizes without proportionally increasing the peel force on the superconducting tape wire.
3Stability of the object's composition
If the superconducting tape wire is bonded to the core, then the coil structure is stable, but distortion occurs due to difference in coefficient of linear expansion between core and tape wire
Solution Approach 1:
The patent applies strong adhesive force only at the innermost turn where the tape wire contacts the core, providing local stability. At boundary portions between layers, weak adhesive force allows controlled movement to accommodate thermal expansion differences, preventing distortion while maintaining overall structural 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 reduces the peel force within the superconducting coil, preventing degradation of superconducting characteristics and enhancing the stability of the coil by maintaining the superconducting state and thermal stability.
Implementation Method 1
adjacent to each other at boundary portions having adhesive force that are set to be less than that of other portions
Implementation Method 2
superconducting tape wires exhibit excellent mechanical properties, for instance, stress resistance, against a longitudinal force but are susceptible to a force applied in a peeling direction
Data Source
AI summary
A superconducting coil is provided with a superconducting coil portion having a plurality of concentric coil layer portions. The superconducting coil portion is formed by winding a thin-film superconducting wire and an insulating material with a multilayer structure, wherein the concentric coil layer portions are adjacent to each other at boundary portions having adhesive force that are set to be less than that of other portions. The concentric coil layer portions each has a non-circular shape or circular shape.