Alternating Permeability Magnetic Cores for Thermal Loss Reduction
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Solution Overview
Problem
Existing magnetic cores face challenges in achieving efficient thermal behavior, reduced power loss, and compact design due to high thermal resistance and leakage fluxes, especially in miniaturized electronic components, which complicates heat dissipation and increases power loss.
Innovation Solution
A magnetic core comprising at least two materials with different magnetic permeabilities, alternately arranged along its longitudinal direction, fabricated using a method that involves filling a mold with these materials and applying pressure, followed by heat treatment to enhance sintering and stability, thereby reducing thermal losses and leakage fluxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic cores use traditional single-material construction, then manufacturing is simple, but thermal losses are high and heat dissipation is poor
Solution Approach 1:
The magnetic core is divided into multiple segments with different magnetic permeabilities arranged alternately along the longitudinal direction. This segmentation creates distinct regions that guide magnetic flux and reduce eddy currents, thereby reducing thermal losses while maintaining a manageable structural complexity through systematic arrangement.
Solution Approach 2:
The patent employs composite construction by combining materials with different magnetic permeabilities (first material with higher permeability and second material with lower permeability) in an alternating pattern. This composite approach optimizes both magnetic flux guidance and thermal loss reduction, achieving superior performance compared to single-material cores.
2Loss of energy
If magnetic cores use insulating films or magnetic insulators to reduce eddy currents, then power loss is reduced, but heat conduction is impaired
Solution Approach 1:
Instead of using insulating films with high thermal resistance, the patent changes the approach by using alternating magnetic permeability regions where the second material has lower permeability but maintains adequate thermal conductivity. This parameter optimization allows simultaneous reduction of eddy currents and maintenance of heat dissipation pathways.
3Volume of moving object
If magnetic cores are miniaturized for compact electronic circuits, then component size is reduced, but thermal management becomes more difficult
Solution Approach 1:
The segmented alternating-permeability structure creates multiple flux guidance paths within the miniaturized core volume. This segmentation efficiently guides magnetic flux through the compact structure while the alternating materials provide distributed thermal management, enabling effective heat dissipation despite the reduced overall size.
4Object-generated harmful factors
If magnetic cores use alternating materials with different permeabilities, then leakage fluxes are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of alternating permeability regions into a single integrated manufacturing process using a mold that receives first and second materials in alternating sequence. This combining of steps during one pressing operation reduces the overall manufacturing complexity despite the sophisticated internal structure required for leakage flux reduction.
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 results in magnetic cores with improved heat dissipation, reduced power loss, and compact design, enabling stable operation and extended service life with lower production costs.
Implementation Method 1
at least two connected regions (142, 144) alternately arranged along a longitudinal direction of the magnetic core (110) wherein the at least two connected regions (142, 144) comprise at least a first material (122) and a second material (124), which differ from each other and comprise different magnetic permeabilities
Implementation Method 2
wherein the first material (122) comprises a first ferrite material and the second material (124) comprises a second ferrite material and/or an oxide ceramic material
Data Source
AI summary
A method for fabricating magnetic cores, wherein the magnetic cores have at least two materials with different magnetic properties. The materials are selected from a ferrite material, an oxide ceramic material and a superparamagnetic material and are formed alternately in individual regions along the magnetic core.