Radial Bypass Superconducting Coil for Quench Suppression
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Solution Overview
Problem
Conventional superconducting coil devices require a separate blocking mechanism to prevent thermal runaway or quench, leading to increased complexity and size due to the need for a protective resistor to shut off the excitation power supply.
Innovation Solution
A superconducting coil with a bypass mechanism that electrically connects superconducting tape wires in the radial direction, allowing current to detour around normal conductive spots and reducing flux flow resistance, thereby preventing thermal runaway or quench.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective resistor and blocking mechanism are added to prevent thermal runaway or quench, then the reliability of the superconducting coil is improved, but the device complexity and size increase
Solution Approach 1:
The bypass conductor is integrated directly into the winding structure of the superconducting coil, merging the protective function with the coil's structural elements. This eliminates the need for separate blocking mechanisms and protective resistors, reducing device complexity while maintaining reliability
Solution Approach 2:
The superconducting coil structure itself provides the protective function through the bypass conductor that is part of its winding architecture. The coil's own structure serves the dual purpose of generating magnetic field and providing thermal protection, eliminating external protective components
2Reliability
If a bypass is provided on the side surface of the winding member, then the reliability against thermal runaway is improved, but the manufacturing complexity increases
Solution Approach 1:
The bypass conductor is positioned specifically on the side surface of the winding member where it can most effectively provide thermal protection. This localized placement optimizes the protective function while minimizing the amount of additional material and complexity required
Solution Approach 2:
The bypass conductor is arranged in the radial direction of the coil, utilizing the radial dimension of the winding structure. This dimensional arrangement allows the bypass to effectively connect superconducting tape wires across turns without interfering with the primary winding architecture
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 bypass mechanism effectively suppresses thermal runaway or quench by diverting current, reducing the risk of overheating and maintaining the superconducting state, while also reducing peeling stress and eddy current losses.
Implementation Method 1
a superconducting wire has a specific range of keeping its superconducting state in terms of current density, temperature, and magnetic field
Implementation Method 2
reducing flux flow resistance, thereby preventing thermal runaway or quench
Implementation Method 3
The joule heat of a normal conductive part due to normal conductive transition may cause thermal runaway of burning the superconducting wire or quench that instantaneously generates a large amount of heat
Data Source
AI summary
A superconducting coil includes: a winding member 12 that has a side surface 18 along a coil radial direction and is formed by laminating a superconducting tape wire 20 in the coil radial direction by winding; and a bypass 19 that is provided on the side surface 18 of the winding member 12 and electrically connects the superconducting tape wire 20 in the coil radial direction.