EMI Damping Device with Cushion Insert for Gap-Free Ferrite Core
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Solution Overview
Problem
Existing devices for suppressing electromagnetic interference (EMI) on electrical conductors often fail to achieve effective interference reduction due to incomplete ferrite core circuits, either from resilient housings that do not close completely or from housing halves that are not under tension.
Innovation Solution
A device with a multi-part annular damping element and a housing comprising shell-shaped parts, where a cushion-shaped insert made of a softer material than the housing is used to ensure a gap-free enclosure of the damping element around the electrical conductor, utilizing elastic materials and arm-shaped support elements to maintain a tight seal and secure positioning of the damping parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a resilient housing lock is used to attach the housing parts, then the housing can be easily assembled and disassembled, but the housing parts do not close completely, resulting in inadequate interference suppression
Solution Approach 1:
The housing is divided into two separate shell-shaped housing parts that can be assembled around the conductor. This segmentation allows the damping element to be positioned correctly within the housing structure, enabling complete enclosure while maintaining ease of assembly through modular construction.
Solution Approach 2:
The housing parts are designed as shell-shaped structures that can flexibly conform to the conductor and damping element geometry. This flexible shell design allows complete closure of the housing parts around the damping element, ensuring gap-free enclosure and effective interference suppression while remaining easy to assemble.
2Device complexity
If the housing halves are not under tension, then the housing structure is simpler, but a closed ferrite core circuit is not guaranteed, resulting in inadequate interference suppression
Solution Approach 1:
The damping element is pre-positioned within the housing structure before final assembly. This preliminary positioning ensures that when the housing parts are closed, the damping element is already in the correct location to form a complete ferrite core circuit, guaranteeing effective interference suppression without requiring complex tensioning mechanisms.
Solution Approach 2:
The shell-shaped housing parts are designed to naturally conform and close completely around the damping element through their flexible geometry. This flexible shell design creates a closed ferrite core circuit without requiring additional tensioning elements or complex structural features, maintaining simplicity while ensuring reliability.
3Reliability
If multiple housing parts are used to enclose the damping element, then the damping element can be securely positioned, but the assembly becomes more complex
Solution Approach 1:
The housing is segmented into two shell-shaped parts that can be easily assembled around the damping element. This segmentation provides secure positioning of the damping element within the housing while maintaining simplicity of assembly through the modular two-part structure.
Solution Approach 2:
The two shell-shaped housing parts serve multiple functions: they enclose the damping element, provide structural support, and enable easy assembly and disassembly. This multi-functionality reduces the need for additional separate components, keeping the overall assembly simple while ensuring reliable damping element positioning.
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 ensures effective suppression of electromagnetic interference signals by creating a closed, gap-free ferrite core circuit, enhancing the resilience and secure attachment of the damping elements for improved EMI suppression.
Implementation Method 1
the cushion-shaped insert consists of an elastic material, in particular an elastic adhesive, with which a damping part of the damping element is attached to the housing
Implementation Method 2
a damping device which comprises a multi-part, in particular two-part, annular damping element made of a damping material which dampens electromagnetic interference signals
Data Source
Figure 1a~1c
Figure 2a~2c
Figure 3a~3b
AI summary
A device (1) for absorbing or reducing signal interference on an electrical conductor is proposed, comprising a feedthrough opening for the electrical conductor and a damping device comprising a multi-part damping element made of a damping material that dampens electromagnetic interference signals, a housing in which the damping element can be accommodated and which is provided for attaching the damping element to the electrical conductor, wherein the housing comprises several housing parts (2, 3), wherein in an assembled state of the device the damping element in the housing surrounds a conductor arranged in the feedthrough opening in a ring-like manner.According to the invention, a cushion-shaped insert is attached to an inner surface section of at least one of the housing parts (2, 3), which in the assembled state of the device (1) is arranged between the housing and the damping element, wherein the cushion-shaped insert presses on a damping part of the damping element and wherein the insert is made of a softer material than the housing shell.