Multilayer Coil Magnetic Particle Layout for Inductance Under DC Bias
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer coils with Fe—Ni-based particles as magnetic elements have high inductance but low DC superimposition characteristics.
Innovation Solution
A coil-type electronic component with a magnetic element body comprising first and second soft magnetic metal particles, where the first particles have higher saturation magnetization than the second, and are arranged in specific regions to enhance inductance and DC superimposition characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If Fe—Ni-based particles are used as magnetic elements, then inductance is increased, but DC superimposition characteristic deteriorates
Solution Approach 1:
The patent applies local quality by using different soft magnetic metal particles in different regions of the magnetic element body. Specifically, Fe—Si-based particles with high saturation magnetization are used in the interlayer region between coil conductor layers to improve inductance, while Fe—Ni-based particles with lower saturation magnetization are used in the axis end regions to maintain DC superimposition characteristic. This spatial differentiation of material properties resolves the contradiction between achieving high inductance and maintaining good DC superimposition characteristic.
2Power
If average particle size of first soft magnetic metal particles is increased, then inductance is increased, but plating elongation and short circuits increase
Solution Approach 1:
The patent applies parameter changes by optimizing the average particle size of the first soft magnetic metal particles (Fe—Si-based) to be within 1 to 6 μm. This specific particle size range achieves an optimal balance: particles large enough to provide sufficient inductance (comparing to particles smaller than 1 μm) but small enough to prevent plating elongation and reduce short circuits (comparing to particles exceeding 6 μm).
3Power
If average particle size of second soft magnetic metal particles is increased, then inductance is increased, but DC superimposition characteristic deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the average particle size of the second soft magnetic metal particles (Fe—Ni-based) to be within 1 to 15 μm. This specific particle size range achieves an optimal balance: particles large enough to provide sufficient inductance (comparing to particles smaller than 1 μm) but small enough to maintain good DC superimposition characteristic (comparing to particles exceeding 15 μm).
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 configuration achieves a balance between high inductance and improved DC superimposition characteristics, reducing plating elongation and short circuits while optimizing particle sizes and proportions.
Implementation Method 1
the first soft magnetic metal particles have a saturation magnetization higher than that of the second soft magnetic metal particles
Implementation Method 2
a magnetic element body comprising first soft magnetic metal particles and second soft magnetic metal particles
Data Source
AI summary
A coil-type electronic component comprises an element including a magnetic element body and a coil conductor. A portion of the magnetic element body in between layers of the coil conductor adjacent to each other in an axis direction of the coil conductor includes first soft magnetic metal particles. A portion of the magnetic element body on an outer side along the axis includes second soft magnetic metal particles. The first soft magnetic metal particles have a saturation magnetization (Ms) higher than that of the second soft magnetic metal particles.