Stranded Wire Bend Radius Integer Multiple of Twist Pitch
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Solution Overview
Problem
Conventional coated wires experience shape abnormalities when bent, leading to impaired flexibility and bulging at the bent portion, especially when the end is fixed, due to uneven strand distribution and length differences on the inner and outer peripheral sides.
Innovation Solution
The wire is designed with strand conductors twisted at a predetermined twist pitch, ensuring that the section length of the bent portion is an integer multiple of the twist pitch, maintaining equal route lengths for all strands and preventing bulging, even when the end is fixed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the end of the stranded conductor is fixed to prevent irregularities, then the shape abnormality is corrected, but the flexibility of the wire is impaired
Solution Approach 1:
The patent applies parameter changes by precisely controlling the bend radius to be an integer multiple of the twist pitch. This specific parameter relationship ensures that strands complete full twist cycles at the bend, equalizing their lengths and eliminating the need for terminal fixation while preserving flexibility.
2Shape
If the end of the stranded conductor is fixed to prevent bulging, then the bent portion shape is corrected, but the inherent flexibility is impaired
Solution Approach 1:
The patent uses parameter changes by setting the bend radius to a specific value (integer multiple of twist pitch). This parameter control prevents strand length differences that cause bulging, eliminating the need for terminal fixation and preserving wire flexibility.
3Reliability
If a dedicated wire configuration is used to avoid shape abnormalities, then the bending resistance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent applies parameter changes by optimizing the bend radius to an integer multiple of the twist pitch. This simple parameter adjustment achieves excellent bending resistance and prevents shape abnormalities using the existing wire structure, avoiding the need for expensive dedicated wire configurations.
Data Source
AI summary
A wire W1 is a wire W1 in which a plurality of strand conductors 11 are twisted at a predetermined twist pitch P1 and which includes a bent portion 20 having a bent shape with a curvature K. A section length L1 of the bent portion 20 is an integer multiple of the twist pitch P1.