Cable with Segmented Conductive Wires Reducing High-Frequency Resistance
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Solution Overview
Problem
Conventional high-frequency alternating-current power transmission cables with magnetic shields experience increased high-frequency resistance due to magnetic flux concentration between electric wires, leading to a smaller current-carrying cross-sectional area and higher resistance.
Innovation Solution
A cable design with a magnetic shield positioned between an outer and inner sheath, featuring alternately arranged first and second electric cords with conductive wires, each connected to terminals with parallel surfaces, and insulated to prevent magnetic flux leakage and concentration, thereby reducing high-frequency resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a magnetic shield is provided in a conventional cable configuration, then leakage flux is reduced, but magnetic flux concentrates between electric wires causing increased high-frequency resistance
Solution Approach 1:
The cable structure is segmented into multiple electric cords (first electric cord with first conductive wires, second electric cord with second conductive wires) arranged in specific patterns. This segmentation allows magnetic flux to be distributed across multiple interfaces rather than concentrating between two wires, reducing the proximity effect while maintaining shielding effectiveness.
Solution Approach 2:
The patent employs asymmetric arrangement where the number of first conductive wires and second conductive wires can differ, and their spatial distribution is optimized. This asymmetric configuration prevents symmetric magnetic flux concentration patterns that would otherwise occur in balanced configurations, thereby reducing high-frequency resistance.
2Reliability
If conductive wires are arranged to reduce proximity effect, then high-frequency resistance decreases, but cable cross-sectional area increases
Solution Approach 1:
The patent implements a nested structure where multiple conductive wires are bundled within electric cords, which are then bundled within the overall cable assembly. This nesting allows efficient space utilization while maintaining the wire arrangements necessary to reduce proximity effects and high-frequency resistance.
Solution Approach 2:
The conductive wires are arranged in three-dimensional space with specific spatial relationships, utilizing vertical and radial dimensions in addition to the horizontal plane. This multi-dimensional arrangement optimizes magnetic flux distribution while compacting the overall cable cross-section.
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 disperses magnetic flux, restricts proximity effects, and maintains a larger current-carrying cross-sectional area, reducing high-frequency resistance while allowing for a smaller cable diameter and simplified connections.
Implementation Method 1
an outside of a pair of electric wires having different phases from each other is covered with a magnetic shield to reduce leakage flux
Implementation Method 2
concentration of magnetic flux is prevented further, and a proximity effect is restricted further than in a configuration in which each of the conductive wires is adjacent to one conductive wire having the other phase
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
Provided is a cable enabling to reduce leakage flux and to restrict an increase of high-frequency resistance. A magnetic shield (6) is provided to enable to reduce leakage of magnetic flux (B) to an outside, and two first conductive wires (21) and two second conductive wires (31) having different phases from each other are adjacent to each other and arranged annularly to enable to disperse the magnetic flux (B), to restrict a proximity effect, and to restrict an increase of high-frequency resistance.