Magneto-Elastic Torque Sensor for Turbo-Machine Overload Protection
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Solution Overview
Problem
Current overload protection mechanisms in turbomachines are static and inflexible, lacking effective methods for dynamic and non-contact measurement of torsional stress on rotating shafts, which limits their ability to prevent overload conditions.
Innovation Solution
Implementing a non-contact magneto-elastic torque sensor to measure and predict torsional stress on rotating shafts, allowing for real-time adjustment of operating parameters to prevent exceeding permissible torque limits, thereby providing flexible and effective overload protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static overload protection via starting current regulation is used, then the drive is protected from overload, but the method is inflexible and not adaptable to dynamic operating conditions
Solution Approach 1:
The patent implements dynamic overload protection by continuously measuring torque during operation and comparing it against time-dependent limit values. The system adapts the permissible torque limits based on operating conditions, time since startup, and thermal states, replacing static starting current regulation with a dynamic control strategy that adjusts protection thresholds in real-time based on actual machine state
Solution Approach 2:
The system employs feedback control by continuously monitoring torque measurements from the rotating shaft and using this information to adjust operating parameters. The measured torque feeds into a control algorithm that compares actual torque against predicted limit values and triggers protective actions when thresholds are approached, creating a closed-loop protection system that responds to actual operating conditions
2Ease of operation
If non-contact torque measurement is implemented, then flexibility and continuous monitoring are improved, but device complexity increases due to additional sensors
Solution Approach 1:
The patent uses magnetic field interactions as an intermediary to measure torque non-contactly. Magneto-elastic sensors detect changes in magnetic properties of the rotating shaft caused by torsional stress, allowing torque measurement without direct mechanical contact. This intermediary approach enables continuous monitoring while avoiding the complexity of direct mechanical coupling or multiple contact sensors
Solution Approach 2:
The system replaces traditional mechanical torque measurement methods (which require direct contact with the rotating shaft) with non-contact magneto-elastic sensing. This substitution eliminates mechanical wear, reduces sensor complexity, and enables continuous operation without interrupting the rotating shaft, achieving ease of operation through electromagnetic field-based measurement
3Reliability
If torque limit values are strictly enforced without prediction, then safety is maintained, but productivity is reduced due to frequent shutdowns
Solution Approach 1:
The system performs preliminary action by predicting future torque developments based on current measurements and operating conditions. Before torque actually exceeds safe limits, the control algorithm anticipates potential overloads and triggers preventive measures such as reducing power output or adjusting operating parameters. This predictive approach allows the system to maintain safety margins while avoiding unnecessary shutdowns by acting before critical thresholds are reached
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting torque limit values based on operating conditions, time-dependent thermal states, and predicted load patterns. Instead of using fixed conservative limits that cause frequent shutdowns, the system adapts permissible torque levels to match actual machine capabilities at different operating points, maintaining reliability while optimizing productivity through data-driven parameter adjustment
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
Enables early prediction and prevention of overload conditions, ensuring the turbomachine operates within safe torque limits by dynamically adjusting parameters such as rotational speed and volume flow, enhancing the reliability and efficiency of turbomachine operation.
Implementation Method 1
A non-contact measuring method is used to measure the torque of the rotary shaft. The method is characterized in that the non-contact measuring method is carried out using a magneto-elastic torque sensor
Data Source
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AI summary
The invention relates to a method for operating a turbo-machine having at least one turbo-machine stage, wherein overload protection of the rotating shaft is provided by the method and, to protect the rotating shaft against overload, a measurement of a torsional stress of the rotating shaft is carried out during operation of the rotating shaft. The torsional stress is measured via a measurement of the torque of the rotating shaft. The torque is preferably measured magneto-elastically. By using the measured torque of the rotating shaft, the development of the torque is forecast. On the basis of the forecast produced, the turbo-machine stage or operating parameters of the turbo-machine is/are regulated. The invention further relates to a turbo-machine comprising at least one turbo-machine stage which has at least one rotating shaft, wherein the turbo-machine has a device for carrying out the method. The turbo-machine is, for example, a turbo-compressor which has a plurality of compressor stages (turbo-machine stages). Each of the compressor stages can be regulated separately. By using the invention, efficient and simple overload protection for a turbo-machine is possible.