Actuator Backlash Monitoring Using Endpoint Position Sensing
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Solution Overview
Problem
Actuators in electromechanical systems, such as aircraft and surgical robots, face challenges due to finite service life limited by backlash, which can lead to unnecessary replacement and increased operational costs, highlighting the need for accurate measurement and monitoring to ensure safe and reliable operation.
Innovation Solution
A method for measuring and monitoring actuator backlash using sensors and processors to determine backlash values and compare them against predetermined thresholds, generating signals for notification and displaying operational conditions, thereby optimizing maintenance and replacement schedules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actuators are replaced at regular intervals to ensure safety, then reliability is improved, but operational costs and time loss increase due to unnecessary replacements
Solution Approach 1:
The patent replaces mechanical replacement schedules with an electronic sensor-based monitoring system that continuously measures actuator backlash and compares it against threshold values to determine when replacement is actually needed
Solution Approach 2:
The system implements continuous feedback by measuring actuator backlash with sensors, comparing measurements to predetermined thresholds, and generating alerts only when backlash exceeds acceptable limits, enabling condition-based maintenance
2Loss of substance
If actuators are monitored continuously to prevent unnecessary replacement, then operational costs decrease, but device complexity increases due to additional sensors and monitoring systems
Solution Approach 1:
The patent extracts only the critical measurement function (backlash measurement) from a complex monitoring system, using simple position sensors and threshold comparisons rather than comprehensive continuous monitoring of all actuator parameters
Solution Approach 2:
The monitoring system uses the actuator's own position sensors to measure backlash, eliminating the need for separate dedicated sensors and reducing overall system complexity
3Reliability
If backlash measurement precision is increased to accurately determine actuator condition, then reliability improves, but measurement complexity and cost increase
Solution Approach 1:
The patent uses position sensors as intermediary devices that indirectly measure backlash through position differences rather than directly measuring the small backlash gap, simplifying the measurement approach
Solution Approach 2:
The system measures backlash by comparing positions at two different endpoints rather than directly measuring the small backlash dimension, transforming a difficult direct measurement into an easier differential measurement
Data Source
AI summary
Systems and methods for backlash measurement and monitoring are disclosed for an actuator having a motor end and an output end. The method may include: driving the motor end of the actuator to one endpoint; measuring, using a first sensor, a motor-end initial position value associated with the motor end; measuring, using a second sensor, an output-end initial position value associated with the output end; driving the motor end of the actuator to another endpoint; measuring a motor-end final position value using the first sensor and an output-end final position value using the second sensor; determining a backlash value based on the motor-end initial position value, output-end initial position value, motor-end final position value, and output-end final position value; generating a signal based on comparing the backlash value to a predetermined threshold; and displaying a notification indicative of an operational condition of the actuator based on the signal.