Actuator Thermal Protection via Shaft Rotation Monitoring
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Solution Overview
Problem
Actuators used in hazardous areas or for regulating volatile materials face challenges in maintaining operating temperatures within safety thresholds, particularly when electric motors seize or lock, leading to excessive heat buildup.
Innovation Solution
Incorporating a safety device with a sensor and control processor that monitors the motor's shaft movement, detects fault conditions, and de-energizes the motor to prevent excessive heat buildup by modulating power based on detected anomalies in rotation speed or translation, ensuring the actuator operates within safe temperature limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor operates continuously to maintain actuator functionality, then productivity is improved, but temperature increases leading to thermal overload in hazardous areas
Solution Approach 1:
The control processor implements periodic monitoring of shaft rotation using the sensor, checking rotation status at defined intervals. This periodic detection enables continuous operation while maintaining temperature control through intermittent fault detection and motor shutdown when necessary.
2Reliability
If the motor operates at high power to ensure reliable actuator performance, then reliability is improved, but excessive heat is generated causing safety issues in hazardous environments
Solution Approach 1:
The sensor provides feedback signals to the control processor about shaft rotation status. This feedback mechanism enables real-time monitoring of motor operation, allowing the system to detect abnormal conditions (such as seized shafts) and automatically shutdown the motor to prevent thermal overload, thus ensuring safety in hazardous areas while maintaining reliable operation during normal conditions.
3Reliability
If a sensor and control processor are added to monitor shaft rotation and detect faults, then safety is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical temperature monitoring and control systems with an electrical sensing and control approach. The sensor detects shaft rotation position and the control processor analyzes rotation characteristics to infer thermal conditions, substituting direct thermal management complexity with electrical measurement and logical control.
4Temperature
If the motor is de-energized frequently to prevent thermal buildup, then temperature control is improved, but productivity decreases due to operational interruptions
Solution Approach 1:
The system performs preliminary detection of fault conditions through continuous shaft rotation monitoring before thermal overload occurs. By detecting abnormal rotation patterns early, the control processor can take preventive action (shutdown) before excessive heat builds up, avoiding the need for frequent reactive shutdowns and maintaining productivity during normal operation.
Data Source
AI summary
A safety device for an actuator that can modulate power to an electric motor in response to a fault condition (e.g., stall). In one embodiment, the actuator can include a motor with a shaft, a sensor disposed in proximity to the shaft, and a control processor coupled with the sensor and the motor. The control processor can be configured to receive a signal from the sensor that conveys operating data that relates to rotation of the shaft, use the operating data to identify a fault condition on the motor, and change the motor from an energized condition to a de-energized condition in response to the fault condition.