Rotating Shaft Torque Measurement Body Balancing
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Solution Overview
Problem
Existing torque measurement devices for rotating shafts suffer from reduced measurement accuracy due to asymmetrical mass distribution in the measurement body, leading to interference torque and limited comparability of measurement signals across different shaft diameters, especially at high rotational speeds.
Innovation Solution
The device features a measurement body with a balanced design, where the principal axis of inertia lies on the longitudinal axis, minimizing static and dynamic imbalances, and utilizing wireless transmission of measurement signals from a telemetry unit to an evaluation unit, allowing for accurate torque measurement across varying shaft diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measurement body with heterogeneous structure (measuring flange, strain gauge, amplifier, telemetry unit) is used, then the device can measure torque, but the asymmetrical mass distribution causes static and dynamic imbalance leading to interference torque that falsifies measurements
Solution Approach 1:
Counterweights are integrated into the measurement body to compensate for the asymmetrical mass distribution caused by the heterogeneous components (strain gauge, amplifier, telemetry unit). The counterweights are positioned and dimensioned to balance both static and dynamic imbalances, eliminating interference torque and enabling accurate torque measurements.
2Adaptability or versatility
If multiple measurement bodies of different dimensions are provided for different shaft diameters, then the device can accommodate various shaft sizes, but the measurement accuracy and comparability of measurement signals are limited, especially at high rotational speeds
Solution Approach 1:
The measurement body is designed with a standardized interface and balanced configuration that enables it to be universally applied to shafts of different diameters. The balancing ensures that dynamic characteristics remain consistent across different applications, making measurement signals comparable regardless of shaft size or rotational speed.
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 enhances measurement accuracy by minimizing interference torque and standardizing measurement signals, enabling precise and comparable torque measurements across different shaft diameters, even at high rotational speeds.
Implementation Method 1
Under the effect of the torque to be measured, the strain gauge generates a measurement signal
Implementation Method 2
the telemetry unit digitizes the amplified measurement signal to obtain measurement data and sends the measurement data via the rotor antenna to the stator antenna from where the measurement data are forwarded to the evaluation unit
Data Source
AI summary
The invention relates to a device for measuring the torque of a shaft rotating about a longitudinal axis and includes a measurement body and an evaluation unit. The measurement body includes a measuring unit, a measuring amplifier unit and a telemetry unit and can be attached to the shaft to rotate with the shaft in the attached state. The measuring unit generates a measurement signal under the effect of the torque on the shaft in the attached state. The measuring amplifier unit amplifies the measurement signal, which the telemetry unit digitizes into a digitized amplified signal that is transmitted by the telemetry unit to the evaluation unit by wireless transmission. The principal axis of inertia of the measurement body lies on the shaft's longitudinal axis in the attached state.