Variable-Cross-Section Inductor Winding for Harmonic Filtering
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Solution Overview
Problem
Industrial power filtering systems face inefficiencies due to overheating in power cables when high-frequency signals are transmitted, as traditional inductors fail to effectively filter out harmonics, leading to increased AC resistance and overheating.
Innovation Solution
A distributed gap inductor with a powdered core is used, featuring a winding with varying cross-sectional areas and geometric shapes, which efficiently passes carrier frequencies while attenuating fundamental frequencies, reducing harmonic amplitudes and minimizing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional inductors are used in power filtering systems, then the system structure is simple, but the inductors fail to effectively filter out high-frequency harmonics, leading to increased AC resistance and overheating in power cables
Solution Approach 1:
The patent changes the physical and geometric parameters of the inductor winding, specifically creating a winding with varying cross-sectional areas along its length. This parameter change enables the inductor to effectively filter high-frequency harmonics while reducing AC resistance and preventing power cable overheating, thereby resolving the contradiction between filtering effectiveness and temperature control.
Solution Approach 2:
The patent employs asymmetric winding geometry where the cross-sectional area of the winding varies along its length, with different sections having different areas. This asymmetric design optimizes the magnetic field distribution and improves harmonic filtering performance at high frequencies while reducing losses and preventing overheating, thus addressing the technical contradiction.
2Speed
If high-frequency signals are transmitted through power cables, then power transmission capability is improved, but AC resistance increases severely causing overheating
Solution Approach 1:
The patent modifies the winding parameters by creating sections with varying cross-sectional areas. This parameter optimization reduces AC resistance losses at high frequencies while maintaining effective harmonic filtering, thereby enabling efficient high-frequency signal transmission without severe energy losses or overheating.
3Reliability
If inductor windings have uniform cross-sectional area, then manufacturing is simple, but filtering effectiveness at high frequencies is insufficient
Solution Approach 1:
The patent implements controlled variations in winding cross-sectional area parameters to achieve superior high-frequency harmonic filtering effectiveness. While this increases manufacturing complexity compared to uniform windings, the structured approach to parameter variation optimizes filtering performance where it is most needed.
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 effectively filters high-frequency harmonics, reducing amplitude by up to 99% and preventing overheating in power cables, enhancing energy processing efficiency and extending the lifespan of electrical components.
Implementation Method 1
A distributed gap inductor with a powdered core is used, featuring a winding with varying cross-sectional areas and geometric shapes, which efficiently passes carrier frequencies while attenuating fundamental frequencies
Implementation Method 2
The solution effectively filters high-frequency harmonics, reducing amplitude by up to 99% and preventing overheating in power cables
Data Source
AI summary
The invention comprises an apparatus, comprising: an inductor, comprising: an inductor core and a winding comprising a wound shape around the inductor core, where the winding comprises a first cross-sectional area at a first longitudinal position along the winding and a second cross-sectional area at a second longitudinal position along the winding, the second cross-sectional area at least twenty percent larger than the first cross-sectional area. Optionally and preferably, the winding includes a first set of cast elements sharing a first geometric shape and a second set of cast elements sharing a second geometric shape, where the alternating members of the first set of cast elements and the second set of cast elements are welded together to form the winding.