Magnetic Core Powder Distribution for DC Bias Stability
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Solution Overview
Problem
Increasing the packing density of soft magnetic powders in magnetic cores to improve magnetic properties leads to local magnetic saturation, which reduces DC superimposition characteristics.
Innovation Solution
A magnetic core with a soft magnetic powder that accounts for 75% to 90% of its section area, featuring a skewness of 0.01 or more in the distribution of area ratios within regular-interval grid square regions, which helps maintain high permeability and excellent DC superimposition characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the packing density of soft magnetic powder is increased to improve magnetic properties, then permeability is improved, but local magnetic saturation occurs which reduces DC superimposition characteristics
Solution Approach 1:
The patent applies local quality by creating non-uniform distribution of soft magnetic powder within the magnetic core. Specifically, the soft magnetic powder concentration varies between the inner region (surrounding the coil) and the outer region, with the inner region having optimized powder density to prevent local magnetic saturation while maintaining high permeability. This localized variation in powder density resolves the contradiction by allowing different regions to have optimal properties for their specific functions.
Solution Approach 2:
The patent changes the parameter of soft magnetic powder concentration/density as a function of position within the core. By adjusting the powder density parameter differently in the inner region compared to the outer region, the patent achieves both high permeability (through sufficient powder density) and good DC superimposition characteristics (by preventing local saturation through controlled density distribution).
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 allows for improved DC superimposition characteristics and higher permeability while reducing the required packing density, preventing local magnetic saturation and enhancing the performance of magnetic components like inductors and transformers.
Implementation Method 1
a soft magnetic powder included in magnetic cores of the magnetic components. For improvement of magnetic properties, attempts have been made to increase the packing density of a soft magnetic powder
Data Source
AI summary
A magnetic core includes a soft magnetic powder. The soft magnetic powder accounts for an area ratio of 75% or more and 90% or less of a section of the magnetic core on average. The area ratio of the soft magnetic powder has a distribution with a skewness of 0.01 or more in absolute value. The distribution of the area ratio of the soft magnetic powder is identified by calculating area ratios of the soft magnetic powder in respective square regions defined by dividing the section of the magnetic core using a regular-interval grid.