Magnetic Shield Winding Optimization for Field Accuracy
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Solution Overview
Problem
Optimizing active field cancellation or generation systems in the presence of passive magnetic shielding material is a long-standing challenge, particularly in applications like biomedical imaging, quantum sensing, and noise suppression, as existing methods fail to accurately account for the warping effects of high magnetic permeability materials on magnetic fields.
Innovation Solution
A method is developed to design a magnetic shield by optimizing the configuration of windings using boundary conditions that account for the presence of passive magnetic shielding material, involving the construction of a Green's function and implementing least squares minimization with penalty terms to determine optimal surface currents and winding parameters, ensuring accurate magnetic field generation or cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive magnetic shielding material is used to cancel magnetic fields, then magnetic field cancellation is achieved, but the material warps the magnetic fields produced by active cancellation coils
Solution Approach 1:
The invention applies preliminary action by pre-optimizing the winding configuration of active coils to account for the presence of passive magnetic shielding material. The optimization process calculates and applies compensation factors before the system operates, ensuring that the active coils generate the correct field distribution even when passive material is present. This preliminary optimization resolves the contradiction by preparing the system in advance to handle the warping effect.
Solution Approach 2:
The invention implements feedback by using an optimization loop that iteratively adjusts winding parameters based on calculated field distributions. The system computes the magnetic field with passive material present, evaluates the accuracy, and refines the winding configuration accordingly. This feedback mechanism ensures that the final winding design compensates for passive material effects, achieving both cancellation and accurate field distribution.
2Reliability
If a large amount of high magnetic permeability material is used for shielding, then magnetic field cancellation is improved, but the complexity and size of the magnetic shield system increases
Solution Approach 1:
The invention applies parameter changes by optimizing key parameters of the active winding system (such as turn density, coil geometry, and current distribution) to achieve effective magnetic shielding with reduced passive material. The optimization process adjusts these parameters to find the optimal balance between active and passive shielding components, maintaining shielding effectiveness while reducing overall system complexity.
Solution Approach 2:
The invention employs composite materials by combining active electromagnetic shielding (through optimized windings) with passive magnetic shielding material. The optimized configuration creates a composite shielding system where the active and passive components work synergistically, allowing for reduced amounts of passive material while maintaining or improving overall shielding effectiveness, thus reducing system complexity.
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 method improves the accuracy of magnetic field generation and cancellation, reducing errors and enhancing the performance of magnetic shields by optimizing winding configurations to compensate for the effects of passive magnetic shielding materials, resulting in more uniform and stable magnetic fields.
Implementation Method 1
a winding configured to produce a specified magnetic field within the structure when current is passed through the winding
Implementation Method 2
the presence of high magnetic permeability material warps the magnetic fields produced by the active cancellation coil system
Data Source
AI summary
A method of designing a magnetic shield comprising a structure enclosing a space, the structure comprising passive magnetic shielding material and a winding configured to produce a specified magnetic within the structure when current is passed through the winding, is disclosed. The method comprises determining an optimised configuration of the winding accounting for the presence of the passive magnetic shield material by implementing one or more boundary conditions at the surface of the passive magnetic shielding material.