Ferrite Core and Bracket for EPS Wire Harness Noise
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Solution Overview
Problem
Electric power steering devices face challenges in suppressing noise and vibration of wire harnesses connected to electric motors, which can lead to radio interference and slight sliding abrasion due to vibrations.
Innovation Solution
Incorporating a ferrite core mounted on the wire harness and fixed to the vehicle's rack housing using a bracket to reduce noise and vibration, thereby preventing sliding abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire harness is connected to an electric motor, then electrical connection is achieved, but noise is generated that disturbs radio reception
Solution Approach 1:
A ferrite core is introduced as an intermediary component between the wire harness and the external environment. The ferrite core absorbs electromagnetic noise generated by the wire harness connected to the electric motor, preventing the noise from disturbing radio reception while maintaining the electrical connection functionality
2Reliability
If a wire harness is connected to an electric motor, then electrical connection is achieved, but vibration occurs causing sliding abrasion
Solution Approach 1:
A bracket is introduced as an intermediary component that fixes the ferrite core (and thereby the wire harness) to the vehicle body. This bracket suppresses the vibration of the wire harness, preventing sliding abrasion at the terminal connection while maintaining the electrical connection to the electric motor
3Object-generated harmful factors
If a ferrite core is mounted on a wire harness and fixed to the vehicle, then noise and vibration are suppressed, but device complexity increases
Solution Approach 1:
The ferrite core and bracket are combined into a single integrated component. The bracket serves dual functions: it fixes the ferrite core to the vehicle body and simultaneously provides vibration suppression for the wire harness. This merging approach reduces the number of separate components and simplifies the overall structure while maintaining effective noise and vibration suppression
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 suppresses noise and vibration of the wire harness, reducing the occurrence of sliding abrasion and maintaining low component and cost increases by utilizing the ferrite core to enhance the flexural rigidity and vibration isolation of the wire harness.
Implementation Method 1
a ferrite core mounted on a wire harness, the wire harness being connected to the electric motor
Implementation Method 2
a bracket configured to fix the ferrite core to a vehicle
Data Source
AI summary
An electric power steering device includes a ferrite core mounted on a wire harness connected to an electric motor and a bracket configured to fix the ferrite core to a vehicle.