Rotary Connector EMI Shielding via Spring Contact
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Solution Overview
Problem
Electromagnetic interference (EMI) disrupts electrical systems in environments like naval vessels, and existing EMI shielding methods, such as Faraday cages, are inefficient when applied to rotating components like antenna pedestals, as they limit access for maintenance and do not accommodate the necessary movement of cables.
Innovation Solution
A rotary connector with a groove and a spring mechanism provides continuous metal contact for EMI shielding, allowing rotation of one portion while keeping the other fixed, ensuring EMI protection and easy access for maintenance by using portal structures with threaded covers that form a continuous metal barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a continuous metal enclosure (Faraday cage) is used for EMI shielding, then EMI protection is improved, but access for maintenance and cable movement are restricted
Solution Approach 1:
The rotary connector divides the continuous metal enclosure into segmented metal portions (stationary and rotating) that can independently move while maintaining EMI shielding. The shield is segmented into a first metal portion attached to the rotating element and a second metal portion attached to the housing, allowing rotation without compromising the continuous shielding barrier.
Solution Approach 2:
The EMI shield transitions from a static continuous enclosure to a dynamic system where metal portions can rotate relative to each other. The spring mechanism enables dynamic movement while maintaining continuous metal contact, allowing the shield to adapt to rotational motion requirements while preserving EMI protection.
2Object-affected harmful factors
If a continuous metal contact is provided for EMI shielding, then EMI protection is improved, but rotation capability is limited
Solution Approach 1:
A spring acts as an intermediary element between the first and second metal portions, enabling rotational movement while maintaining continuous metal contact for EMI shielding. The spring flexes to accommodate rotation and uses its own metal structure to bridge the gap between stationary and rotating metal portions, preserving the shielding continuity during rotation.
Solution Approach 2:
The spring functions as a flexible metallic element that can deform elastically to accommodate rotational movement. This flexible metal component maintains continuous electrical and physical contact between the stationary and rotating metal portions, enabling rotation while preserving the EMI shielding barrier.
3Ease of operation
If a rotary connector with spring mechanism is used, then rotation and maintenance access are improved, but device complexity increases
Solution Approach 1:
The design merges multiple functions into a single integrated structure: the spring simultaneously provides mechanical flexibility for rotation, maintains continuous metal contact for EMI shielding, and enables maintenance access. The metal portions are integrated with both the rotating element and housing, combining structural support, rotation capability, and EMI shielding in one unified system.
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 EMI, allowing for easy maintenance and repair of rotating antenna pedestals by maintaining continuous metal contact and reducing the complexity of access, thus minimizing downtime and preventing EMI disruption.
Implementation Method 1
a spring disposed in the groove and having metal contact with the first metal portion and the second metal portion
Data Source
AI summary
In one aspect, a rotary connector having a longitudinal axis includes a first metal portion including a groove about the longitudinal axis. The rotary connector also includes a second metal portion and a spring disposed in the groove and having metal contact with the first portion and the second portion. One of the first metal portion or the second metal portion is configured to rotate about the longitudinal axis and the other of the first metal portion or the second metal portion is configured to remain substantially rotationally fixed with respect to the longitudinal axis. The rotary connector may be used for electromagnetic interference (EMI) shielding with antenna pedestals.