Coated Magnetic Particle Core for Lower Eddy Current Loss
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Solution Overview
Problem
The miniaturization and thinning of magnetic components lead to challenges in maintaining equivalent characteristics, with increased magnetic material ratios causing insulation deterioration and eddy current loss, particularly when using magnetic metal particles.
Innovation Solution
A magnetic component design incorporating first and second magnetic particles with surface layers of Fe oxide and Si oxide, respectively, along with a third layer of phosphate or functional groups, enhances insulation and reduces eddy current loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ratio of magnetic material in the core is increased to meet miniaturization and thinning requirements, then the magnetic component characteristics are improved, but the insulation of the magnetic body deteriorates and eddy current loss occurs
Solution Approach 1:
The patent applies different surface treatments to different particle size categories: particles of 15-35 μm receive Fe oxide coating followed by Si oxide coating, while particles of 0.9-4.5 μm receive phosphate coating. This localized differentiation optimizes insulation properties for each particle size group, preventing eddy current loss while maintaining magnetic characteristics in the miniaturized core structure.
Solution Approach 2:
The patent uses composite coating structures combining multiple materials: Fe oxide and Si oxide layers on larger particles, and phosphate layers on smaller particles. These composite material systems provide both insulation properties to prevent eddy current loss and compatibility with the magnetic metal particles, resolving the contradiction between maintaining magnetic characteristics and preventing harmful eddy current effects.
2Reliability
If magnetic metal particles are used to increase particle content for permeability characteristics, then permeability is improved, but insulation deteriorates and eddy current loss occurs
Solution Approach 1:
The patent implements localized quality enhancement by applying specific coating compositions to different particle size ranges. Particles of 15-35 μm are coated with Fe oxide and Si oxide, while particles of 0.9-4.5 μm are coated with phosphate. This local differentiation maintains the magnetic metal particle composition for permeability while providing appropriate insulation for each size group.
Solution Approach 2:
The surface coatings (Fe oxide, Si oxide, and phosphate layers) act as intermediary substances between the magnetic metal particles and the surrounding environment. These intermediary layers preserve the magnetic metal particle composition needed for permeability characteristics while providing the insulation properties that prevent eddy current loss, thus mediating between the two conflicting requirements.
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 design improves structural stability and insulation, maintaining performance characteristics while allowing for smaller and thinner magnetic components.
Implementation Method 1
the first layer of the first magnetic particles includes Fe oxide
Implementation Method 2
the second layer of the first magnetic particles includes Si oxide
Implementation Method 3
the first layer of the second magnetic particles includes P oxide
Data Source
AI summary
A magnetic component includes a magnetic body, wherein the magnetic body includes a plurality of first magnetic particles including an Fe component and a plurality of second magnetic particles including an Fe component and having an average particle diameter smaller than an average particle diameter of the plurality of first magnetic particles, at least some of the plurality of first magnetic particles include a first layer formed on a surface and a second layer formed on a surface of the first layer, at least some of the plurality of second magnetic particles include a first layer formed on a surface, the first layer of the first magnetic particles includes Fe oxide, the second layer of the first magnetic particles includes Si oxide, and the first layer of the second magnetic particles includes P oxide.