Magnetic Layer Inductor Structure for Inductance and Flat Mounting
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Solution Overview
Problem
Inductors with rectangular wire cross-sections face challenges in orienting anisotropic magnetic particles due to corners, leading to insufficient inductance and poor mountability due to surface unevenness, while circular wires improve inductance but result in poor mountability due to surface irregularities.
Innovation Solution
An inductor design featuring a wire with a conducting line and insulating layer, covered by a magnetic layer containing anisotropic magnetic particles, where the magnetic layer is oriented along the wire periphery and extends 1.5 times the wire's longest and shortest dimensions, ensuring flat surfaces for improved inductance and mountability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular wire cross-section is used, then the inductor structure is simple and easy to manufacture, but the anisotropic magnetic particles cannot be properly oriented due to corners, resulting in insufficient inductance
Solution Approach 1:
The wire cross-section is changed from rectangular to circular shape. This curvature eliminates the corner regions that prevent proper orientation of anisotropic magnetic particles, allowing the particles to align uniformly along the wire periphery and achieve the desired inductance enhancement.
Solution Approach 2:
The magnetic layer is designed with different properties in different regions: in the peripheral region (0.5-2.0 times the wire radius), the anisotropic magnetic particles are oriented along the wire periphery to maximize inductance, while in the inner region (0-0.5 times the wire radius), the particles have different orientation characteristics. This local differentiation optimizes both inductance and manufacturing.
2Reliability
If a circular wire cross-section is used with anisotropic magnetic particles oriented around the wire, then inductance is improved, but surface unevenness occurs resulting in poor mountability
Solution Approach 1:
The magnetic layer is designed with spatially varying properties: the peripheral region (0.5-2.0 times wire radius) contains oriented anisotropic magnetic particles for high inductance, while the thickness is controlled to ensure flat outer surfaces. This local differentiation allows the inductor to achieve both excellent inductance through particle orientation and good mountability through surface flatness.
Solution Approach 2:
The thickness of the magnetic layer is precisely controlled as a parameter. By limiting the magnetic layer thickness in the radial direction and ensuring the outer surfaces remain flat, the inductor maintains good mountability while the oriented particles in the peripheral region provide the necessary inductance enhancement.
3Reliability
If the magnetic layer thickness is increased to improve inductance, then more magnetic material is available, but the surface unevenness increases resulting in poor mountability
Solution Approach 1:
The magnetic layer thickness is differentiated by region: in the peripheral region where particle orientation provides high inductance contribution, the thickness is optimized to balance inductance enhancement with surface flatness. In the inner region, different thickness characteristics are allowed. This local optimization enables sufficient inductance without excessive surface unevenness.
Solution Approach 2:
The magnetic layer thickness is controlled as a critical parameter within specific ranges (0.5-2.0 times the wire radius for the peripheral region). By precisely controlling this parameter, the patent achieves optimal balance between inductance performance and surface flatness for mountability.
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 design achieves excellent inductance and mountability by ensuring proper orientation of anisotropic magnetic particles and flat surfaces, allowing reliable conveyance and mounting without tilting.
Implementation Method 1
the magnetic layer contains an anisotropic magnetic particle... in a peripheral region of the wire, the magnetic layer includes an orientated region in which the anisotropic magnetic particle is orientated along a periphery of the wire
Data Source
AI summary
An inductor includes a wire, and a magnetic layer covering the wire. The wire includes a conducting line, and an insulating layer. The magnetic layer contains an anisotropic magnetic particle and a binder. In a peripheral region of the wire, the magnetic layer includes an orientated region in which the anisotropic magnetic particle is orientated along the periphery of the wire. The peripheral region is, in a cross-sectional view, a region from an outer surface of the wire to an outward distance of 1.5 times an average of the longest length and the shortest length from the center of gravity of the wire to the outer surface of the wire. An upper surface and a lower surface of the inductor are flat.