Superconductive Magnet Coil Assembly with Localized Strip Configurations
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Solution Overview
Problem
Existing superconductive magnet coil assemblies face limitations in generating a homogeneous magnetic field due to anisotropic superconductors, with current-carrying capacity being heavily dependent on magnetic field strength and direction, leading to inefficiencies and difficulties in soldering and insulation, especially in NMR applications.
Innovation Solution
A cylindrically symmetric magnet coil assembly with a rectangular cross-section, using multiple strip-like superconductors with varying current-carrying capacities wound in different regions, and electrically connected outside the winding stack, allowing for reduced radial field components and improved homogeneity, with the option of using wedges for precise winding and reduced material requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If strip-like HTS superconductors are used in a layer-wound coil, then energy efficiency is improved due to zero ohmic losses, but the current-carrying capacity is suppressed at axial ends where radial magnetic field components are greatest
Solution Approach 1:
The patent applies local quality by using different strip configurations in different axial regions of the coil. Specifically, a first strip-like HTS superconductor is used in a first axial region while a second strip-like HTS superconductor with different dimensions is used in a second axial region. This allows each region to be optimized for its local magnetic field conditions, maintaining high current-carrying capacity where radial field components are strongest while preserving the zero ohmic loss advantage throughout the coil.
2Stability of the object's composition
If the coil is designed to be cylindrically symmetric, then field homogeneity is improved, but the anisotropic nature of HTS superconductors causes current-carrying capacity to vary with magnetic field direction
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through region-specific strip configurations. In axial regions where the magnetic field has significant radial components, the coil uses strip-like HTS superconductors with dimensions and orientations optimized for radial field tolerance. In axial regions where axial field components dominate, different strip configurations are used. This localized optimization maintains overall field homogeneity while compensating for anisotropic effects in specific regions.
Solution Approach 2:
The patent applies segmentation by dividing the coil into multiple axial regions, each with its own optimized strip configuration. The coil is segmented along the axial direction into a first axial region and a second axial region, with each region containing strip-like HTS superconductors tailored to the magnetic field characteristics of that region. This segmentation allows the coil to maintain cylindrical symmetry and field homogeneity while addressing anisotropic limitations in specific zones.
3Reliability
If multiple strip-like superconductors are used in different axial regions, then current-carrying capacity is improved, but manufacturing complexity increases due to soldering and insulation requirements
Solution Approach 1:
The patent applies segmentation by dividing the coil into discrete axial regions, each with its own strip configuration. This segmentation into manageable sections (first axial region with first strip type, second axial region with second strip type) makes the manufacturing process more systematic and controllable, reducing the overall complexity compared to a fully customized continuous design.
4Object-affected harmful factors
If strip-like superconductors are guided into regions outside the rectangular coil cross-section, then radial field components are reduced, but the coil geometry becomes more complex
Solution Approach 1:
The patent applies the blessing in disguise principle by converting the harmful effect of strong radial magnetic field components at the axial ends into a beneficial design feature. Instead of simply accepting the radial field as an unavoidable constraint, the invention guides strip-like HTS superconductors into regions outside the rectangular coil cross-section, where they experience reduced radial field components. This transforms the geometric constraint into an opportunity to optimize superconductor placement and reduce anisotropic losses.
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 enhances the homogeneity and stability of the magnetic field, reduces material usage, and simplifies the soldering process, making it suitable for NMR applications by optimizing current density and conductor geometry.
Implementation Method 1
Superconducting magnet coils allow extremely energy-efficient generation of strong and temporally constant magnetic fields, since said coils can be operated entirely without, or at least with very small, ohmic losses
Implementation Method 2
the coil... is intended for generating an operating magnetic field in a working volume around the axis of symmetry
Data Source
AI summary
A superconductive magnet coil assembly includes a layer-wound coil that is cylindrically symmetric, wherein the rectangular coil cross section of the coil has a first rectangular portion (1; 1′; 1″; 1′″) within the coil cross section, and at least one second rectangular portion (2; 2′; 2″; 2′″) and third rectangular portion (3; 3′; 3″; 3′″) within the first portion which spans the first portion completely in the radial direction and in part in the axial direction, the second portion being completely wound with the first strip-like superconductor, and the third portion being completely wound with the second strip-like superconductor, and the strip-like superconductors being guided into a region outside the coil cross section and being electrically connected there, and wherein the second and the third rectangular portions are disjunct.