Composite Magnetic Core Coating for Low Core Loss and DC Bias
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Solution Overview
Problem
Existing magnetic components face challenges in achieving low core loss and good DC bias characteristics simultaneously, particularly in reducing size and improving efficiency while maintaining energy savings.
Innovation Solution
A magnetic core with a specific composition and structure, including metal magnetic particles with a total area ratio of 75% to 90% on its cross-section, comprising large particles with a crystalline structure and nanocrystal or amorphous structure, and small particles with different insulation coatings, optimized to balance core loss and DC bias characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal magnetic powder is used to improve magnetic permeability, then magnetic permeability is improved, but core loss increases
Solution Approach 1:
The patent applies different insulation coating thicknesses to different particle sizes: larger particles (≥3μm) receive thicker insulation coatings while smaller particles receive thinner coatings. This local differentiation optimizes both magnetic permeability and core loss by balancing magnetic coupling and eddy current suppression in different particle regions
Solution Approach 2:
The patent uses a composite particle system combining crystalline metal magnetic material particles with nanocrystal or amorphous structure particles. This composite approach leverages the high magnetic permeability of crystalline structures while the nanocrystal/amorphous particles contribute to reduced core loss, achieving both improved reliability and reduced energy loss
2Quantity of substance
If particle size is reduced to improve packing density, then packing rate is improved, but DC bias characteristics deteriorate
Solution Approach 1:
The patent differentiates insulation coating thickness based on particle size: larger particles (≥3μm) receive thicker coatings to maintain DC bias characteristics, while smaller particles receive thinner coatings to maintain packing density. This local quality approach resolves the contradiction between packing rate and DC bias performance
Solution Approach 2:
The patent optimizes the particle size distribution parameters, specifically controlling the ratio of large particles (≥3μm) to small particles, and adjusts insulation coating thickness parameters (T1/T2 ratio of 1.3 to 50) to simultaneously achieve high packing rates and good DC bias characteristics
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 magnetic core achieves compatible low core loss and excellent DC bias characteristics, enhancing magnetic permeability and reducing core loss while maintaining high efficiency and energy savings.
Implementation Method 1
an insulation coating of the first large particles is thicker than an insulation coating of the second large particles
Implementation Method 2
a magnetic core containing a metal magnetic powder
Data Source
AI summary
Provided is a magnetic core in which metal magnetic particles occupy an area of 75% to 90% on a cross-section. The metal magnetic particles include first large particles having a crystalline metal material and having a Heywood diameter of 3 μm or more on the cross-section of the magnetic core, and second large particles having a nanocrystal structure or an amorphous structure and having a Heywood diameter of 3 μm or more, and an insulation coating of the first large particles is thicker than an insulation coating of the second large particles.