Flexible Magnetic Shielding Sheath for Vehicle Cables
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Solution Overview
Problem
Existing magnetic shielding solutions for electric cables in vehicles are not suitable due to their bulkiness and the use of expensive, non-modular materials like Mumetal or Permaloy, which are not flexible and cannot be easily adapted to confined spaces.
Innovation Solution
A flexible magnetic shielding sheath made of elongated elements with electrically conductive and magnetic properties, which can be wound or intertwined around the cable, providing a return path for current and mitigating the magnetic field emitted by the cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional magnetic shielding materials (Mumetal, Permaloy) are used to shield the cable, then magnetic field shielding effectiveness is improved, but flexibility and adaptability to confined spaces deteriorate
Solution Approach 1:
The shielding sheath is constructed from multiple elongated elements (wires, strips, or rods) rather than a solid block of magnetic material. These segmented elements are assembled in a grid-like pattern, allowing the structure to be flexible while maintaining magnetic shielding effectiveness through the collective arrangement of high-permeability material segments.
Solution Approach 2:
The invention uses thin-walled tubular structures and flexible assemblies of elongated elements that can conform to confined spaces and cable geometries. The sheath can be deformed and adapted to fit around cables in tight vehicle interiors while maintaining its magnetic shielding function through the distributed magnetic properties of the assembled elements.
2Object-affected harmful factors
If boxes are constructed for magnetic shielding, then magnetic field shielding is achieved, but space requirements and device complexity increase
Solution Approach 1:
The shielding sheath performs multiple functions simultaneously: it provides magnetic field shielding, acts as a return conductor for current, and serves as a protective covering for the cable. This multi-functionality eliminates the need for separate shielding boxes and return conductors, reducing overall space requirements and structural complexity in the vehicle installation.
Solution Approach 2:
The shielding sheath is designed to fit tightly around the cable in a nested configuration, with the elongated elements arranged in concentric or grid patterns that maximize shielding effectiveness within minimal radial space. This nested arrangement avoids the need for bulky external shielding boxes.
3Object-affected harmful factors
If materials with very high relative permeability are used, then magnetic shielding effectiveness is improved, but manufacturing difficulty and cost increase
Solution Approach 1:
By segmenting the high-permeability magnetic material into discrete elongated elements, the invention enables standard manufacturing processes for producing individual components, which can then be assembled using conventional techniques. This avoids the need for costly and complex molding operations required for solid blocks of high-permeability alloys like Mumetal or Permaloy.
Solution Approach 2:
The elongated elements can be made from more economical magnetic materials that, while having lower individual permeability than premium alloys, provide adequate shielding effectiveness when assembled in sufficient quantity and density. This approach uses cheaper, easier-to-manufacture materials in a distributed configuration to achieve the required shielding performance.
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 reduces the intensity of the magnetic field emitted by the cable, providing a flexible and adaptable shielding that can be easily installed in vehicles, while being cost-effective and modular.
Implementation Method 1
the sheath forms a return conductor for the current carried in the outgoing direction by the cable housed in the sheath. the current in the shielding sheath creates a magnetic field opposite to the disturbing magnetic field created by the current flowing in the cable
Implementation Method 2
the elongated elements made of material with magnetic properties provide shielding against the resulting magnetic field
Data Source
Figure 1
Figure 2~5
Figure 6~9
AI summary
The invention relates to a sheath (30) which forms, in the assembled state, a flexible tubular casing configured to receive the cable (20). The sheath (30) includes elongate elements (40, 41, 42) such as wires or straps, which comprise: - elongate elements (41) of a first type, made of at least one electrically conductive material; - elongate elements (42) of a second type, different from the first type, made of at least one material having magnetic properties sufficient for producing the shielding effect; said elongate elements being assembled in an interlaced manner and/or by forming an intertwining, and the sheath (30) being made in the form of a sheet that is initially substantially flat, capable of being wound around the cable (20).