Superconducting Coil Insulation Structure for Peeling and Quench Suppression
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Solution Overview
Problem
The generation of cooling and electromagnetic stress in superconducting coils leads to cracking and peeling at the interface between the adhesive resin and insulating sheet, potentially causing heat transfer to the superconducting wire and quenching.
Innovation Solution
A superconducting coil design featuring an insulating sheet composed of multiple layers of resin sheets and semi-cured resin fiber sheets, with adjacent layers bonded only at their ends, and a bonding method that suppresses adhesive entry between these layers, allowing easy peeling to release strain energy and prevent heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the superconducting coil is cooled and excited, then the superconducting coil generates cooling stress and electromagnetic stress, but this causes cracking and peeling at the interface between the adhesive resin and the insulating sheet
Solution Approach 1:
The insulating sheet is divided into multiple layers (first insulating sheet, second insulating sheet, third insulating sheet) with different material properties. Each layer serves a specific function: the first layer provides electrical insulation, the second layer (resin fiber sheet) suppresses peeling through its fiber structure, and the third layer provides additional insulation. This segmentation allows the system to handle both cooling stress and electromagnetic stress without interface failure.
Solution Approach 2:
The insulating sheet uses a composite structure combining different materials: plastic sheets for electrical insulation and resin fiber sheets for mechanical strength and peeling suppression. The resin fiber sheet, in particular, combines the flexibility of fibers with the bonding properties of resin, creating a material that can accommodate stress while preventing interface separation.
2Strength
If the adhesive resin bonds the superconducting wire and insulating sheet, then the interface strength is improved, but heat transfer to the superconducting wire may be caused when cracking or peeling occurs
Solution Approach 1:
The resin fiber sheet acts as an intermediary layer between the adhesive resin and the insulating sheet. Its fiber structure creates a tortuous path for heat transfer, reducing thermal conductivity while maintaining mechanical bonding. This intermediary layer prevents direct heat transfer from the adhesive resin to the superconducting wire, even when stress causes some interface separation.
3Reliability
If the insulating sheet uses multiple layers of resin sheets and semi-cured resin fiber sheets, then peeling and cracking are suppressed, but the device complexity increases
Solution Approach 1:
Multiple insulating sheets are merged into a single integrated insulating sheet structure. The first, second, and third insulating sheets are bonded together to form one continuous component that performs multiple functions simultaneously: electrical insulation, stress distribution, and peeling suppression. This merging reduces assembly complexity while maintaining the benefits of multiple layers.
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 design effectively suppresses peeling and cracking, preventing heat transfer to the superconducting wire and thereby reducing the risk of quenching, while maintaining low adhesive strength and facilitating strain release.
Implementation Method 1
The plurality of resin sheets and the two semi-cured resin fiber sheets have mutually adjacent resin and semi-cured resin fiber sheets bonded together
Implementation Method 2
The adhesive resin is introduced between the superconducting wire and the insulating sheet
Implementation Method 3
prevent easy transfer of heat to the superconducting wire
Data Source
AI summary
A superconducting coil comprises a superconducting wire, an insulating sheet, and an adhesive resin. The insulating sheet includes a plurality of resin sheets and two semi-cured resin fiber sheets. The plurality of resin sheets have electrical insulation and are disposed in at least two layers. The two semi-cured resin fiber sheets are disposed in layers with the plurality of resin sheets disposed therebetween. The plurality of resin sheets and the two semi-cured resin fiber sheets have mutually adjacent resin and semi-cured resin fiber sheets bonded together.