Soft Magnetic Powdered Core Resin Particle Size Optimization
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Solution Overview
Problem
Soft magnetic powdered cores used in high-frequency applications suffer from insufficient electrical insulation, leading to increased eddy current loss and heat generation, which compromises durability and magnetic flux density, while increasing resin content to improve insulation reduces the amount of soft magnetic powder and magnetic flux density.
Innovation Solution
A method for producing soft magnetic powdered cores using resin powder with a median size of not more than 30 μm, a maximum particle size of not more than 100 μm, and a specific surface area of not less than 1.0 m2/cm3, which is achieved by crushing and classifying resin powders, allowing for uniform interposition of resin between soft magnetic powder particles, thereby enhancing electrical insulation and magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If resin amount is increased to improve electrical insulation, then specific electric resistivity value is increased and eddy current loss is decreased, but the amount of soft magnetic powder is decreased and magnetic flux density is decreased
Solution Approach 1:
The patent changes the particle size parameters of resin powder (median size of 5-30 μm, maximum size of 100 μm or less) and specific surface area (0.5-2.0 m2/cm3) to optimize the balance between electrical insulation and magnetic flux density. By controlling these parameters, the patent achieves adequate insulation with minimal resin content, preserving magnetic flux density while reducing eddy current loss.
2Reliability
If resin amount is increased to improve electrical insulation, then durability is improved, but the amount of soft magnetic powder is decreased
Solution Approach 1:
The patent optimizes resin powder parameters (particle size and specific surface area) to achieve the minimum effective resin content for durability. This allows maximum soft magnetic powder content while maintaining adequate electrical insulation and bonding, thereby preserving both durability and magnetic performance.
3Ease of manufacture
If conventional resin powder is used, then production is simple, but electrical insulation is insufficient and eddy current loss is increased
Solution Approach 1:
The patent specifies precise particle size ranges (median 5-30 μm, maximum 100 μm) and specific surface area (0.5-2.0 m2/cm3) for resin powder to achieve adequate electrical insulation. These controlled parameters enable effective insulation with minimal resin, reducing eddy current loss while maintaining production simplicity through direct mixing and compacting.
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 significantly reduces eddy current loss and heat generation, improving the durability and performance of soft magnetic cores by maintaining high magnetic flux density even at high frequencies, while minimizing the amount of resin used.
Implementation Method 1
the specific electric resistivity value ρ is increased, and the eddy current loss We can thereby be decreased
Implementation Method 2
compact the mixture into a predetermined shape so as to obtain a compact, and heating the compact
Data Source
AI summary
A method for producing a soft magnetic powdered core includes preparing a mixture of a soft magnetic powder and a resin powder, compacting the mixture into a predetermined shape so as to obtain a compact, and heating the compact. The resin powder has a median size of not more than 30 μm, a maximum particle size of not more than 100 μm, and a specific surface area of not less than 1.0 m2/cm3, and the additive amount thereof is 0.005 to 2 vol %.