Split Conductor Cable Geometry for Magnetic Interference Immunity
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Solution Overview
Problem
Conventional electric cables are vulnerable to external magnetic fields, leading to interference-induced voltages and currents that can endanger equipment, and existing shielding methods increase costs and complexity.
Innovation Solution
The cables are designed with conductors split into sub-conductors arranged in specific geometries to reduce self-inductance and magnetic field sensitivity, eliminating the need for traditional shielding structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal shielding is used to block electromagnetic interferences, then protection against external fields is improved, but cable price and installation costs significantly increase
Solution Approach 1:
The cable conductors are divided into multiple sub-conductors (e.g., splitting a single conductor into two or more parallel sub-conductors). This segmentation allows the magnetic field interference to be distributed across multiple smaller conductors, reducing the induced voltage in each sub-conductor and thereby providing protection without requiring external metal shielding.
Solution Approach 2:
The invention utilizes the principle of electromagnetic induction in reverse by arranging sub-conductors such that the induced voltages from external magnetic fields cancel each other out. The harmful magnetic field interference is converted into a beneficial cancellation effect through proper geometric arrangement of the sub-conductors, eliminating the need for additional shielding materials.
2Object-affected harmful factors
If conductors are twisted to reduce external magnetic field influence, then magnetic field attenuation is improved, but cable length increases and active resistance increases
Solution Approach 1:
Instead of twisting conductors along the cable length (one-dimensional approach), the invention arranges sub-conductors in specific geometric patterns in the cross-sectional plane (two-dimensional arrangement). The sub-conductors are positioned at specific distances and angles from each other, creating a multi-dimensional spatial configuration that reduces magnetic field sensitivity without extending the cable length or increasing conductor length.
3Ease of manufacture
If conventional cable designs are used, then manufacturing simplicity is maintained, but immunity to external magnetic fields is insufficient
Solution Approach 1:
The conductors are segmented into multiple sub-conductors that can be manufactured using standard extrusion processes. Each sub-conductor is independently formed and then assembled into the final cable structure, maintaining manufacturing simplicity while achieving improved magnetic field immunity through the segmented configuration.
Solution Approach 2:
The invention changes the geometric parameters of the conductor arrangement (number of sub-conductors, their diameters, spacing distances, and angular positions) to optimize magnetic field attenuation. These parameter changes are achieved through standard manufacturing processes, maintaining ease of manufacture while significantly improving reliability against magnetic interferences.
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
This design significantly enhances the attenuation of external magnetic fields, reducing interference and costs while maintaining or reducing material usage, resulting in more robust and cost-effective self-protected cables.
Implementation Method 1
The cables are designed with conductors split into sub-conductors arranged in specific geometries to reduce self-inductance and magnetic field sensitivity
Data Source
AI summary
The present invention provides electric cable having substantial immunity to external magnetic fields. The cables may be prepared by splitting one or more conductors of an original cable design into two or more sub-conductors, determining a crosssectional area for each one of the sub-conductors to obtain a desirable electrical current density therethrough, arranging the sub-conductors in said cable in an intervening fashion such that each sub-conductor is placed adjacent and alongside at least one neighboring conductor or sub-conductor associated with either a different electrical phase or electric current direction, and electrically connecting the sub-conductors of each split conductor in parallel.