Composite Ballast Seal for EMI Shielding and Potential Equalization
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Solution Overview
Problem
Existing ballast seals, particularly in e-mobility applications, fail to effectively shield against electromagnetic interfering waves with frequencies ≥30 MHz and do not adequately prevent mechanical damage from electrostatic charges and voltage breakdowns between machine elements with differing potentials.
Innovation Solution
A ballast seal comprising a substantially annular potential equalization ring made of electrically-conductive material and at least one shielding ring made of soft magnetic material, which is electrically non-conductive, is used to achieve controlled electrical potential equalization and effective shielding against high-frequency electromagnetic interfering waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically-conductive material is used for potential equalization, then mechanical damage from voltage breakdown is prevented, but shielding against electromagnetic interfering waves with frequency ≥30 MHz is not effective
Solution Approach 1:
The ballast seal combines an electrically-conductive material (such as carbon-loaded PTFE or conductive rubber) with a soft magnetic material (such as ferrite or permeable rubber) to create a composite structure. This composite design allows the seal to simultaneously provide electrical potential equalization through the conductive component and effective shielding against high-frequency electromagnetic interference through the magnetic component, resolving the contradiction between these two previously mutually-exclusive functions.
2Ease of manufacture
If the ballast seal is made as a single integrated component, then assembly is simplified, but adaptability to different sealing and shielding requirements is reduced
Solution Approach 1:
The ballast seal is designed as a modular assembly comprising distinct components: an electrically-conductive sealing ring component and one or more soft magnetic shielding ring components. These segmented components can be independently manufactured, selected, and assembled in different configurations to meet specific application requirements, thereby maintaining ease of assembly while significantly improving adaptability to various sealing and electromagnetic shielding needs.
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 shields against electromagnetic interfering waves and prevents mechanical damage from electrostatic charges by ensuring controlled potential equalization between machine elements, maintaining constant electrical resistance and minimizing assembly errors through a modular, pre-assemblable design.
Implementation Method 1
at least one shielding ring (2) made of a soft magnetic material for shielding against electromagnetic interfering waves
Implementation Method 2
a substantially annular potential equalization ring (1) made of an electrically-conductive material
Data Source
AI summary
A ballast seal for a sealing ring includes: a substantially annular potential equalization ring made of an electrically-conductive material and which can be brought into contact in a sealing manner with a surface to be sealed of a machine element to be sealed; and at least one shielding ring made of a soft magnetic material so as to shield against electromagnetic interfering waves.