Permanent Magnet Geometry for Uniform Magnetocaloric Fields
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Solution Overview
Problem
Magnetic refrigeration devices face inefficiencies due to non-uniform magnetic field distribution across magnetocaloric materials, leading to suboptimal heat transfer and cooling performance.
Innovation Solution
A magnet arrangement featuring congruent permanent magnets with trapezoidal cross-sections and arcuate shapes, where magnetic field lines converge and diverge, creating a stronger and more uniform magnetic field through the magnetocaloric elements, enhancing heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional magnets with uniform cross-section are used, then the device structure is simple, but the magnetic field distribution is non-uniform leading to suboptimal heat transfer
Solution Approach 1:
The patent applies asymmetry by designing magnets with non-uniform cross-sections, specifically trapezoidal and wedge-shaped configurations. These asymmetric shapes create converging and diverging magnetic field patterns that improve heat transfer efficiency by ensuring more uniform magnetic field distribution across the magnetocaloric material, resolving the contradiction between energy efficiency and structural simplicity.
Solution Approach 2:
The patent employs curved surfaces in the magnet design, including arcuate shapes and rounded edges, to optimize magnetic field distribution. The curved geometries help create more uniform magnetic field patterns compared to straight-edged conventional magnets, improving heat transfer while maintaining reasonable structural complexity.
2Temperature
If magnet size is increased to strengthen magnetic field, then magnetic field strength improves, but the volume of magnet material increases
Solution Approach 1:
The patent applies local quality by varying the cross-sectional dimensions of magnets at different locations. The trapezoidal and wedge-shaped magnets have different thicknesses at different positions, creating locally optimized magnetic field strength. This allows achieving high magnetic field strength in critical areas without proportionally increasing the overall magnet volume, resolving the contradiction between field strength and material volume.
Solution Approach 2:
The patent changes geometric parameters of the magnets, specifically the cross-sectional dimensions and shapes, to optimize magnetic field characteristics. By adjusting parameters like thickness, width, and curvature radius of the trapezoidal and wedge-shaped magnets, the patent achieves enhanced magnetic field strength with reduced material volume compared to conventional uniform-crosssection magnets.
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 achieves a more efficient magnetic refrigeration process by maintaining high magnetic field strength uniformly across the magnetocaloric elements, reducing the required magnet material volume and improving cooling performance.
Implementation Method 1
The magnets are typically moved in an alternating fashion relative to the magnetocaloric material such that the magnetocaloric material experiences an increasing magnetic field when the magnets move closer, heating up the magnetocaloric material, and a decreasing magnetic field when the magnets move farther away, cooling the magnetocaloric material.
Data Source
AI summary
A magnet arrangement for creating a magnetic field. The magnet arrangement includes a first magnet having a first surface defining a first pole and a second surface defining a second pole opposite the first pole, and a second magnet having a third surface defining a third pole and a fourth surface defining a fourth pole opposite the third pole. The second surface has a higher magnetic flux density than the first surface. The third surface has a higher magnetic flux density than the fourth surface. The second magnet is spaced from the first magnet to define a first gap between the second surface and the third surface. Magnetic field lines of the magnetic field run from the first surface to the second surface, from the second surface to the third surface through the first gap, and from the third surface to the fourth surface.