Multicore Cable Oval Insulation Drain Wire Groove Torsion Stability
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Solution Overview
Problem
Multicore cables with two-core parallel electric wires face challenges in enhancing electrical characteristics, particularly in maintaining stability and resistance to torsion during twisting.
Innovation Solution
A multicore cable configuration featuring two-core parallel electric wires with an insulating layer of oval cross-section, a drain wire in a groove, a first shield tape, and a jacket, where the twist pitch is shorter than 250 mm, ensuring stability and resistance to torsion while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the twist pitch of the multicore cable is reduced to improve electrical characteristics and resistance to torsion, then the electrical characteristics and torsion resistance are enhanced, but the cable flexibility and ease of installation are reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the twist pitch within a specific range (100-250 mm) to optimize electrical characteristics while maintaining cable flexibility. This quantitative parameter optimization resolves the contradiction between improved reliability and operational ease.
2Reliability
If the insulating layer cross-section is made oval with specific axis ratio to improve electrical characteristics, then the electrical performance is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The patent transforms the insulating layer from a conventional circular cross-section to an oval cross-section with a specific axis ratio (1.5-2.0). This geometric parameter change optimizes electrical characteristics by improving conductor spacing and signal isolation, while the standardized oval shape keeps manufacturing feasible through modified extrusion processes.
3Reliability
If the groove depth in the insulating layer is increased to improve drain wire contact with shield tape, then the electrical shielding performance is enhanced, but the risk of insulating layer damage increases
Solution Approach 1:
The patent optimizes the groove depth as a critical parameter, setting it to 0.5-1.0 mm to achieve sufficient drain wire contact with the shield tape for effective shielding, while maintaining enough insulating material thickness to prevent layer damage and maintain structural integrity.
4Reliability
If the major axis to minor axis ratio of the oval insulating layer is increased to improve electrical characteristics, then the electrical performance is enhanced, but the cable outer diameter increases
Solution Approach 1:
The patent balances the oval insulating layer dimensions by controlling the major axis to minor axis ratio within 1.5-2.0, which optimizes electrical characteristics through improved conductor geometry while limiting the overall cable outer diameter increase to acceptable levels for practical installation.
Data Source
AI summary
A multicore cable includes two-core parallel electric wires, wherein the two-core parallel electric wires each includes two conductors; an insulating layer that covers a periphery of the two conductors and having first and second flat portions and first and second semicircular portions; a first shield tape that covers a periphery of the insulating layer; a drain wire arranged inside the first shield tape; and a jacket that covers the first shield tape, wherein a cross-section of the insulating layer is an oval shape and has a groove at a portion at the first flat portion, wherein the drain wire is retained in the groove such that a portion of the drain wire protrudes toward the first shield tape with respect to the insulating layer, and wherein a twist pitch of twisting together the two-core parallel electric wires is shorter than 250 mm.