Ferrite Shielding Seal for EMI Isolation and Voltage Breakdown Prevention
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Solution Overview
Problem
Existing seals in e-mobility applications fail to effectively shield against electromagnetic interfering waves with frequencies ≥30 MHz and do not adequately prevent voltage breakdowns between machine elements with different electrical potentials.
Innovation Solution
A seal comprising a sealing ring made of a conventional material and at least one shielding ring made of a soft magnetic material, such as ferrite, which is electrically non-conductive and designed to shield against electromagnetic interfering waves, combined with an optional electrically-conductive potential equalization ring to manage potential differences between machine elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically-conductive ballast seal is used for potential equalization, then voltage breakdowns are prevented, but electromagnetic interfering waves with frequency ≥30 MHz cannot be effectively shielded
Solution Approach 1:
The sealing system is divided into functionally separate components: an electrically-conductive ballast seal for potential equalization and a non-conductive sealing ring for electromagnetic shielding. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
A non-conductive sealing ring is introduced as an intermediary component between the electrically-conductive ballast seal and the medium to be sealed. This intermediary provides electromagnetic shielding while allowing the ballast seal to perform potential equalization without direct contact with the medium.
2Device complexity
If a single component performs both sealing and potential equalization, then device complexity is reduced, but electromagnetic shielding effectiveness is compromised
Solution Approach 1:
The sealing system is segmented into distinct components with specific functions: the sealing ring for electromagnetic shielding and the ballast seal for potential equalization. This segmentation resolves the contradiction by allowing each component to perform its optimized function.
Solution Approach 2:
While the components are functionally separated, they work together as an integrated sealing system that provides both electromagnetic shielding and potential equalization, achieving multi-functionality through coordinated operation of specialized components.
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 high-frequency electromagnetic interfering waves and prevents voltage breakdowns by ensuring strict functional separation between shielding and potential equalization, enhancing the reliability and durability of machine element seals in e-mobility applications.
Implementation Method 1
at least one shielding ring (2) made of a soft magnetic material for shielding against electromagnetic interfering waves
Implementation Method 2
at least one shielding ring (2) made of a soft magnetic material for shielding against electromagnetic interfering waves
Data Source
AI summary
A seal includes: a sealing ring made of a sealing material; and at least one shielding ring made a soft magnetic material for shielding against electromagnetic interfering waves. In an embodiment, the at least one shielding ring is formed by a ferrite ring. In an embodiment, the at least one shielding ring includes at least two shielding rings, the at least two shielding rings being arranged in a functional series connection.