Polarized RF Rotary Joint for High-Speed Slip Ring Data Transfer
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Solution Overview
Problem
Conventional rotary joints face challenges such as short lifetimes, susceptibility to interference, complexity, and high costs due to the use of sliding contacts or complex non-contact methods, limiting their effectiveness in transmitting high-speed data across rotating interfaces.
Innovation Solution
A non-contacting slip ring system utilizing RF antenna technology with polarized signals, specifically helical-shaped antennae for circular polarization, and 60 GHz chipsets for Wi-Fi, ZigBee, Bluetooth, or IEEE 802.11 standards, allowing for reliable and cost-effective high-speed wireless networking across rotating interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional contact-type slip rings are used to transmit signals and power, then power transmission is achieved, but the brush life is short due to frictional and arc wear
Solution Approach 1:
The patent replaces the mechanical contact-based signal transmission system with an electromagnetic induction system. The stationary coil and rotating coil create magnetic coupling that transfers signals without physical contact, eliminating brush wear while maintaining signal transmission reliability. This is achieved through the stationary coil generating a magnetic field that induces current in the rotating coil, and vice versa for bidirectional communication.
2Reliability
If optical non-contact-type slip rings are used, then signal transmission reliability is improved, but the system becomes complex to install and repair with expensive components
Solution Approach 1:
The patent uses simple, inexpensive coil structures instead of complex optical components. The coils can be easily manufactured and replaced if needed, providing a cost-effective solution that maintains signal transmission reliability without requiring specialized installation or repair expertise. The magnetic coupling mechanism is inherently robust and tolerant to misalignment.
Solution Approach 2:
The patent divides the signal transmission function into separate stationary and rotating coil assemblies, each independently manageable. This segmentation allows for easy replacement or maintenance of individual coils without affecting the entire system, reducing installation and repair complexity compared to integrated optical systems.
3Manufacturing precision
If coaxial RF rotary joints are used, then signal integrity is maintained, but material cost and assembly cost are high due to tight tolerances
Solution Approach 1:
The patent changes the operating parameters by using magnetic field coupling at lower frequencies compared to coaxial RF systems. This allows for larger tolerances in coil positioning and spacing while maintaining signal integrity. The magnetic coupling is less sensitive to dimensional variations, enabling easier manufacturing and assembly without requiring tight tolerances.
4Power
If conventional slip rings are used, then power transmission is achieved, but the system is susceptible to interference and has limited frequency range
Solution Approach 1:
The patent creates a universal coupling system where the same magnetic induction mechanism can transmit both power and various types of signals (audio, data, control) across a wide frequency range. The system is adaptable to different applications by simply changing the coil configurations and operating frequencies, providing multi-functionality without requiring separate systems for different signal types.
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 system provides sufficient bandwidth for high-speed data transmission with improved reliability and reduced costs, avoiding the limitations of traditional methods by using polarized RF signals and standard chipsets, ensuring continuous and efficient data transfer across rotating interfaces.
Implementation Method 1
The first and second antennae are adapted to communicate with each other by at least partially using polarized signals
Implementation Method 2
A non-contacting slip ring system utilizing RF antenna technology with polarized signals
Implementation Method 3
specifically helical-shaped antennae for circular polarization
Data Source
Figure 1~3
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AI summary
A system and method for communicating signals through a slip ring. It includes a stator and a rotor configured to rotate relative to the stator about a rotation axis, the rotor having a first wireless module with a first antenna. The stator has a second wireless module with a second antenna. The first and second antennae are arranged along the rotation axis. The first and second antennae are adapted to communicate with each other by at least partially using polarized signals.