Wireless Telemetry System for Rotating Shaft Torque Measurement
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Solution Overview
Problem
Existing systems face challenges in efficiently transferring data and power between moving and stationary devices without physical contact, particularly in applications involving rotating shafts, due to issues like cable sensitivity and reliability.
Innovation Solution
A wireless telemetry system using RF technology with air gap transformers and amplitude shift keying (ASK) digital signal modulation, combined with industrial Ethernet communication, to enable power supply and bidirectional data transfer between moving and stationary bodies, utilizing a rotor electronics module, caliper coupling module, and signal processing module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical connections (cables) are used to transfer data and power between moving and stationary bodies, then reliable power supply and data transfer are achieved, but cable sensitivity and reliability issues arise, particularly in rotating shaft applications
Solution Approach 1:
The patent replaces mechanical cable connections with wireless RF electromagnetic field-based power and data transfer. The rotor electronics module transmits power and telemetry data wirelessly to the stationary body, eliminating physical cables that cause sensitivity issues in rotating applications.
Solution Approach 2:
The patent introduces an RF electromagnetic field as an intermediary medium to transfer power and data between moving and stationary bodies. The air gap transformer and RF circuitry enable wireless coupling, allowing energy and information transfer without direct physical contact.
2Object-affected harmful factors
If wireless RF power and data transfer is implemented, then cable sensitivity issues are eliminated, but power transfer efficiency and reliability may be compromised
Solution Approach 1:
The patent combines multiple functions into the RF transmission system: power transfer, bidirectional data communication (telemetry), and feedback control all occur through the same wireless RF channel. This multi-functionality consolidates what would otherwise require separate systems into a unified reliable solution.
Solution Approach 2:
The patent implements feedback mechanisms where the stationary body receives telemetry data from the moving body via RF, processes it, and sends control signals back. This closed-loop feedback ensures reliable operation by continuously monitoring and adjusting power and data transfer parameters.
3Ease of operation
If air gap transformer techniques with RF modulation are used, then wireless power and data transfer is achieved, but system complexity increases
Solution Approach 1:
The patent integrates multiple functional components within nested structures: the rotor electronics module contains both power reception and data transmission circuitry; the air gap transformer is nested within the coupling assembly; RF modulation and demodulation functions are integrated into compact modules. This nesting reduces overall system complexity while maintaining wireless operation.
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 solution allows for reliable and efficient data capture and power transmission across the air gap, enhancing measurement capabilities in high-speed applications like torque measurement, while reducing the need for physical connections and improving system reliability.
Implementation Method 1
utilizing telemetry techniques combined with air gap transformer techniques
Implementation Method 2
an RF transformer operating at, for example, 66.78 MHz to transfer power across the stationary base-moving body gap
Implementation Method 3
use amplitude shift keying (ASK) digital signal modulation of the same RF carrier to transmit a limited number of codes to the moving body
Data Source
AI summary
A moving or rotating body and a stationary body having a wireless communication link with each other. The communication link may involve RF telemetry. The stationary body may provide power in a wireless manner to the rotating body. The moving body may be a rotation sensor for determining torque, speed of rotation, angular position, power and the like. The stationary body may also interact with a processing module via a communication medium. The communication medium may be an Ethernet or an equivalent.