Soft Magnetic Powder Core Insulation via Composition
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Solution Overview
Problem
Existing powder magnetic cores face challenges in achieving high insulating properties between particles, leading to reduced magnetic properties and increased loss due to the need for a large amount of insulating material, which decreases the proportion of magnetic powder and enhances eddy current loss.
Innovation Solution
A soft magnetic powder with a composition of Fe100-a-b-c-d-e-fCuaSibBcMdM′eXf, containing a crystalline structure with a particle diameter of 1 nm to 30 nm in 40 vol % or more and Vickers hardness between 1000 and 3000, which ensures high insulating properties when compacted, reducing the need for additional insulating material and enhancing magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating material is used to insulate magnetic powder particles, then insulating properties between particles are improved, but the proportion of magnetic powder decreases and magnetic properties deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the magnetic powder by adding specific elements (Cu: 0.1-3.0 at%, Si: 0.1-5.0 at%, B: 0.1-10.0 at%, M: 0.1-20.0 at%, M′: 0.1-10.0 at%, X: 0.1-5.0 at%) to inherently increase the volume resistivity of the magnetic powder particles themselves, eliminating the need for additional insulating materials while maintaining high magnetic powder proportion
Solution Approach 2:
The magnetic powder particles themselves provide the insulating function through their inherent high volume resistivity caused by the specific compositional parameters, rather than relying on external insulating materials. The particles serve both magnetic and insulating functions simultaneously
2Quantity of substance
If proportion of insulating material is decreased, then magnetic powder proportion is increased, but insulating properties between particles cannot be ensured and eddy current loss increases
Solution Approach 1:
By optimizing the compositional parameters (particularly Cu, Si, B, and other elements within specific ranges), the invention achieves volume resistivity of 1 kΩ·cm or more, which inherently suppresses eddy current loss while allowing high magnetic powder proportion without additional insulating materials
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 a powder magnetic core with low loss and excellent magnetic properties, achieving high reliability and efficiency by maximizing the proportion of soft magnetic powder and minimizing eddy current loss without the use of additional insulating materials.
Implementation Method 1
the volume resistivity of a green compact is 1 kΩ·cm or more and 500 kΩ·cm or less
Data Source
AI summary
A soft magnetic powder has a composition represented by Fe100-a-b-c-d-e-fCuaSibBcMdM′eXf (at %) (wherein M is Nb, W, Ta, Zr, Hf, Ti, or Mo, M′ is V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, or Re, X is C, P, Ge, Ga, Sb, In, Be, or As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1≤a≤3, 0<b≤30, 0<c≤25, 5≤b+c≤30, 0.1≤d≤30, 0≤e≤10, and 0≤f≤10), wherein a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less is contained in an amount of 40 vol % or more, and the Vickers hardness of the particles is 1000 or more and 3000 or less.