Magnetic Powder Particle Coverage for Inductor Permeability
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Solution Overview
Problem
Existing magnetic powders with blended particle groups of different sizes suffer from reduced dispersibility and fluidity, leading to low filling factors and permeability in magnetic compacts and inductors.
Innovation Solution
A magnetic powder composition with first and second magnetic particles of varying sizes, where at least part of the second particles are covered by the first particles, achieving a coverage ratio of L1/L2 ≥ 0.42, and a magnetic compact with a similar configuration where second particles are surrounded by first particles with a coverage ratio of L1/L2 ≥ 0.95, enhancing permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If two particle groups with different average particle sizes are blended by usual known technique, then particle size distribution is achieved, but dispersibility and fluidity of particles are reduced
Solution Approach 1:
The patent applies the nesting principle by having smaller first magnetic particles adhere to and cover the surfaces of larger second magnetic particles. This creates a hierarchical structure where small particles are 'nested' on large particles, achieving effective particle size distribution while maintaining good dispersibility and fluidity because the coated structure prevents particle aggregation.
Solution Approach 2:
The patent creates a composite particle structure where first magnetic particles and second magnetic particles form a combined coating layer on the larger particles. This composite approach allows the mixture to exhibit improved dispersibility and fluidity compared to simple blending, as the composite structure optimizes inter-particle interactions.
2Quantity of substance
If two particle groups with different average particle sizes are blended by usual known technique, then particle size distribution is achieved, but permeability is difficult to enhance
Solution Approach 1:
The nested structure of small particles on large particles creates continuous magnetic pathways while minimizing air gaps. The small first particles bridge and connect magnetic flux paths between large second particles, significantly enhancing the overall permeability of the magnetic compact.
Solution Approach 2:
By concentrating small magnetic particles at the interfaces and cavity regions between large particles, the patent optimizes magnetic flux continuity at critical locations. This local quality enhancement ensures efficient magnetic coupling and maximizes permeability.
Data Source
AI summary
A magnetic powder contains first magnetic particles, second magnetic particles having a particle size larger than a particle size of the first magnetic particles, and resin. At least one portion of each of the second magnetic particles is covered by the resin and the first magnetic particles. Coverage (L1/L2)≥0.42 holds, where L1 is a sum of particle sizes of the first magnetic particles covering the second magnetic particle and L2 is a perimeter of the second magnetic particle.