Composite Soft Magnetic Material for High-Current Power Inductors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Soft magnetic materials face challenges in high-frequency applications due to heat generation, low insulation, and voltage withstanding performance, as well as unstable permeability with temperature changes, which are exacerbated by low permeability and high temperature coefficients, necessitating a composite material with high magnetic permeability and temperature stability for automotive electronics.
Innovation Solution
A composite soft magnetic material comprising 67.9 to 95.54 wt % FeSiCr, 0.1 to 0.3 wt % TiO2, 0.15 to 0.75 wt % SiO2, 0.1 to 0.5 wt % Mn3O4, 0.1 to 0.5 wt % ZnO, 3.4 to 25.9 wt % BaO, 0.4 to 3 wt % B2O3, and 0.2 to 0.85 wt % CaO, prepared through a method involving dry mixing, pre-sintering, grinding, granulation, and sintering under controlled conditions to enhance permeability and insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If soft magnetic alloy is used, then saturation magnetic flux density is high, but resistivity is low causing heat generation and low insulation at high frequency
Solution Approach 1:
The patent creates a composite soft magnetic material by combining soft magnetic alloy particles with ferrite particles and binder resin. This composite structure allows the material to inherit high saturation magnetic flux density from the soft magnetic alloy while gaining high resistivity and insulation properties from the ferrite particles, thereby resolving the contradiction between magnetic performance and electrical insulation at high frequencies.
Solution Approach 2:
The patent applies local quality by creating regions with different compositions within the magnetic material. Soft magnetic alloy particles provide high saturation flux density in specific regions, while ferrite particles provide high resistivity in other regions. This spatial distribution of different material properties allows the overall material to achieve both high magnetic performance and good insulation characteristics simultaneously.
2Quantity of substance
If soft magnetic ferrite is used, then initial permeability and resistivity are high, but temperature coefficient is high causing unstable permeability with temperature changes
Solution Approach 1:
The patent combines soft magnetic alloy particles with ferrite particles in a composite structure. The soft magnetic alloy component has low temperature coefficient that compensates for the ferrite's high temperature coefficient, while the ferrite provides high initial permeability and resistivity. This composite approach allows the material to maintain stable permeability across temperature ranges while preserving high magnetic performance.
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 material achieves high initial permeability, high saturation magnetic flux density, and excellent temperature stability, meeting the requirements for miniaturization and high-current applications in power inductors with improved insulation and voltage withstanding performance.
Implementation Method 1
Soft magnetic alloy has the most obvious advantages of high saturation magnetic flux density (Bs)... soft magnetic ferrite has the most obvious advantages of high initial permeability
Implementation Method 2
soft magnetic ferrite has the most obvious advantages of high initial permeability and resistivity (102 to 106 Ω·cm)... improved insulation and voltage withstanding performance
Implementation Method 3
The method for preparing a composite soft magnetic material includes mixing, pre-sintering, grinding, pressing, and sintering
Data Source
AI summary
A composite soft magnetic material includes the following components: 67.9 to 95.54 wt % of FeSiCr, 0.1 to 0.3 wt % of TiO2, 0.15 to 0.75 wt % of SiO2, 0.1 to 0.5 wt % of Mn3O4, 0.1 to 0.5 wt % of ZnO, 3.4 to 25.9 wt % of BaO, 0.4 to 3 wt % of B2O3, 0.2 to 0.85 wt % of CaO, and 0.01 to 0.3 wt % of CuO. The composite soft magnetic material has high initial permeability and high Bs, excellent temperature stability, and low temperature coefficient.