Asymmetric Magnet Ring Array for Lightweight Uniform Fields
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Solution Overview
Problem
Existing magnet designs for generating strong and uniform magnetic fields are limited by their size and weight, making them unsuitable for applications requiring lightweight solutions, such as portable MRI systems.
Innovation Solution
The development of a lightweight magnet array comprising multiple magnet rings with rotational symmetry and finite magnetization components along azimuthal and longitudinal-radial planes, arranged with reflectional asymmetry to generate a uniform magnetic field along a longitudinal axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional permanent magnet assemblies are used to generate strong and uniform magnetic fields, then the magnetic field strength and uniformity are improved, but the size and weight of the system increase significantly
Solution Approach 1:
The magnet assembly is divided into multiple discrete magnet rings arranged along the longitudinal axis, with each ring contributing to the overall magnetic field. This segmentation allows for optimized field generation with reduced material usage compared to a solid magnet body.
Solution Approach 2:
The magnet rings are arranged with reflectional asymmetry about the transverse plane, meaning the configuration above and below the midplane is not identical. This asymmetric arrangement enables efficient magnetic field generation while minimizing the amount of magnetic material required, thereby reducing weight.
2Stability of the object's composition
If conventional permanent magnet assemblies are used to generate strong and uniform magnetic fields, then the magnetic field uniformity is improved, but the device size increases
Solution Approach 1:
The use of multiple discrete magnet rings allows for precise control of the magnetic field distribution along the longitudinal axis. By strategically positioning and orienting each ring, uniform field regions can be created within a compact overall length.
Solution Approach 2:
The magnet rings possess three-dimensional magnetization with finite components in both the azimuthal direction and the longitudinal-radial plane. This multi-dimensional magnetization approach enables efficient field generation in a compact configuration.
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 proposed magnet array achieves a strong and uniform magnetic field with minimal weight, suitable for applications like portable MRI systems, while also minimizing fringe fields outside the magnet array.
Implementation Method 1
at least one of the magnet rings possesses rotational symmetry and has both a finite component of magnetization along an azimuthal (θ) coordinate, and a finite magnetization in a longitudinal-radial plane. The multiple magnet rings configured to jointly generate a magnetic field along a direction parallel to the longitudinal axis.
Data Source
AI summary
A magnet array (700) includes multiple magnet rings (711-720) and a frame. The multiple magnet rings are positioned along a longitudinal axis and coaxially with the longitudinal axis, wherein at least one (712, 713, 719) of the magnet rings possesses rotational symmetry and has both a finite component of magnetization along an azimuthal (θ) coordinate, and a finite magnetization in a longitudinal-radial plane. The multiple magnet rings are configured to jointly generate a magnetic field along a direction parallel to the longitudinal axis. The frame is configured to fixedly hold the multiple magnet rings in place.