Wire Harness Magnetic Core Stress Isolation
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Solution Overview
Problem
Wire harnesses with magnetic cores made of materials whose magnetic properties change with stress application face issues of magnetic property alteration when electric wires are bent, leading to ineffective electromagnetic noise suppression.
Innovation Solution
A wire harness design featuring an electromagnetic wave suppression member with a restricting member and an annular magnetic core, where the restricting member is more rigid than the electric wires and covers their periphery, preventing contact and stress on the magnetic core, which is made of nanocrystalline soft magnetic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the magnetic core is formed of nanocrystalline soft magnetic material to improve electromagnetic noise suppression, then the electromagnetic noise reduction is enhanced, but the magnetic properties change when stress is applied during wire harness routing
Solution Approach 1:
A rigid restricting member is introduced as an intermediary component between the electric wires and the magnetic core. This restricting member covers the periphery of the electric wires and prevents them from contacting the magnetic core, thereby mediating the interaction and preventing stress transmission to the magnetic core while maintaining the electromagnetic noise suppression function
Solution Approach 2:
The restricting member is provided in advance to prevent potential contact between the electric wires and the magnetic core before stress can be applied to the magnetic core. This preemptive protection ensures that the magnetic core is cushioned against stress during wire harness routing and installation, maintaining its magnetic properties
2Ease of operation
If the electric wires are allowed to bend freely during routing, then the ease of installation is improved, but the bent wires contact the magnetic core causing magnetic property changes
Solution Approach 1:
The restricting member acts as a mediator that allows the electric wires to bend and move freely while preventing them from contacting the magnetic core. This intermediary structure maintains installation flexibility while protecting the magnetic core from stress-induced magnetic property changes
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 configuration maintains the magnetic properties of the magnetic core unchanged while effectively reducing electromagnetic noise, even when the wire harness is routed or bent, by preventing stress application to the core and ensuring compact and lightweight construction.
Implementation Method 1
an annular magnetic core, which is provided around the inner wall portion
Data Source
AI summary
A wire harness includes electric wires, and an electromagnetic wave suppression member that includes a restricting member and an annular magnetic core, the restricting member being provided to cover a periphery of the electric wires and including an inner wall portion more rigid than the electric wires, and the magnetic core being provided around the inner wall portion. The restricting member includes fixing portions formed to fix the electromagnetic wave suppression member to a fixing target.