Superconducting Coil Module Screening Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods to address screening currents in superconducting magnets lead to increased system complexity, size, and cost, while methods to reduce screening currents, such as current over-shooting, compromise system efficiency and rated performance.
Innovation Solution
A superconducting coil module with a heating device that controls the threshold current by optimizing the temperature distribution across the coil, using customized heating patterns to minimize screening currents and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods such as current over-shooting or field shaking are used to compensate for screening current effects, then the central magnetic field reduction and spatial magnetic field uniformity distortion are improved, but the system complexity increases
Solution Approach 1:
The heating device is divided into multiple independent heating patterns (first heating patterns and second heating patterns) that can be independently controlled. Each heating pattern targets specific regions of the superconducting coil to locally adjust threshold currents, thereby reducing screening currents in specific areas without requiring complex supplementary external devices.
Solution Approach 2:
The patent replaces mechanical or external supplementary devices with a thermal field control system. By using heating patterns to thermally modulate the superconducting coil's threshold current distribution, the system eliminates the need for mechanical supporters or external compensation devices, thus reducing system complexity while maintaining magnetic field uniformity.
2Reliability
If supplementary devices are installed outside the system to solve screening current problems, then the mechanical deformation is compensated, but the system size increases
Solution Approach 1:
The heating device is integrated directly with the superconducting coil structure, merging the threshold current control function into the coil assembly itself. This eliminates the need for separate external supplementary devices or mechanical supporters, thereby reducing system size while maintaining mechanical stability through reduced screening currents.
3Object-generated harmful factors
If current over-shooting method is used to reduce screening current, then the screening current amount is reduced, but the system cannot operate with inherent efficiency and rated performance
Solution Approach 1:
The heating device applies localized thermal treatment through specifically positioned heating patterns that target regions with highest threshold currents. This locally reduces screening currents without requiring global current over-shooting, allowing the system to operate at rated performance and inherent efficiency while still reducing harmful screening current effects.
4Object-generated harmful factors
If heating patterns are optimized to control threshold current distribution, then the screening current is reduced, but the manufacturing complexity increases
Solution Approach 1:
The heating patterns are designed with asymmetric distributions that match the asymmetric threshold current profile of the superconducting coil. By positioning heating patterns at specific radial distances (e.g., 0.3-0.7 times the outer radius) and using different heating densities in different regions, the system effectively reduces screening currents while maintaining manufacturability through straightforward pattern fabrication.
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 reduces the absolute amount of screening current, preventing mechanical deformation and system complexity, while maintaining efficient operation and performance.
Implementation Method 1
a first heating device coupled to one surface of the first coil and including at least one first heating pattern controlling a threshold current for each turn of the first coil
Implementation Method 2
an induced current is generated by a magnetic flux density created by a conducting current when charging an operation current, which is called a screening current
Implementation Method 3
the density of the screening current corresponds to the superconducting threshold current density called critical current density
Data Source
AI summary
A superconducting coil module includes: a first coil composed of a superconducting wire material wound multiple times; and a first heating device coupled to one surface of the first coil and including at least one first heating pattern controlling a threshold current for each turn of the first coil as a minimum threshold current, wherein at least one first heating pattern is disposed on a path according to a predetermined ratio between the inner and outer boundaries of the first coil.