Linear Actuator Amplitude Monitoring for Early Abnormality Detection
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Solution Overview
Problem
Existing linear actuators lack an effective method for early detection of abnormalities, relying on predetermined detection values that are influenced by component variations, making early detection unreliable.
Innovation Solution
The method involves detecting temporal changes in the amplitude of the movable element by analyzing induced voltage during non-conductive periods and adjusting loop gain and target amplitude values based on these changes, allowing for early detection of abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined detection value is used to detect abnormalities, then the detection method is simple, but early detection of abnormalities cannot be realized due to component variations
Solution Approach 1:
The system performs preliminary action by detecting temporal changes in amplitude before abnormalities reach critical levels. By continuously monitoring amplitude variations over time and comparing them against reference values, the system can identify trends indicating potential failures before they occur, enabling preventive maintenance rather than waiting for threshold-based anomaly detection.
Solution Approach 2:
The system implements feedback by continuously measuring the amplitude of the movable element, comparing it against reference amplitude values, and using this information to detect abnormalities. The control unit receives feedback about amplitude changes and adjusts its detection strategy accordingly, allowing for early abnormality detection while maintaining systematic simplicity.
2Reliability
If the predetermined detection value is set low for early detection, then early detection is improved, but false detection increases due to component variations
Solution Approach 1:
The system detects temporal changes in amplitude as a preliminary indicator of potential abnormalities. By monitoring the trend of amplitude changes over time rather than relying on a single threshold value, the system can identify early signs of failure without triggering false detections from normal component variations.
Solution Approach 2:
The detection approach transitions from a static predetermined threshold to a dynamic reference value that adapts to normal operational variations. The control unit compares measured amplitude against a reference value that accounts for component variations, allowing the system to maintain high detection sensitivity while reducing false positives through adaptive thresholding.
3Reliability
If continuous monitoring of amplitude is performed, then early detection is improved, but energy consumption increases
Solution Approach 1:
The system uses the existing induced voltage signal that is already present during non-conductive periods to detect amplitude changes. By utilizing this naturally occurring signal rather than requiring separate active sensing operations, the system achieves continuous monitoring capability without additional energy consumption for dedicated detection operations.
Solution Approach 2:
The system performs amplitude detection periodically during non-conductive periods when the actuator is naturally not driving current through the coil. By utilizing these existing idle periods for measurement purposes, the system achieves continuous monitoring functionality without requiring additional active measurement phases, thereby avoiding extra energy consumption.
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 approach enables the early detection of abnormalities with higher accuracy by monitoring temporal changes in load conditions, allowing for timely measures such as warning or stopping the drive, and optimizing control methods based on load change likelihood.
Implementation Method 1
a method for detecting movement (displacement, speed, or acceleration) of the movable element by detecting the induced voltage generated at the coil of the electromagnet
Data Source
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AI summary
An amplitude control unit (40) detects the amplitude of a movable element (12) that reciprocates relative to a stator (11), detects fluctuations in a load over time according to detected fluctuations over time in the amplitude, and detects an abnormality on the basis of the detected fluctuations over time in the load. The amplitude control unit (40) outputs the detected amplitudes to a control output unit (50). The control output unit (50) controls a drive current (Id) for reciprocating the movable element (12) on the basis of the amplitude information supplied from the amplitude control unit (40).