Barrier Leaf Position Sensing With Non-Integer Gear Feedback
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Solution Overview
Problem
Existing automatic gates with moving parts pose safety risks due to sharp edges and lack automatic interruption mechanisms for potential impacts, requiring manual intervention for safety, and existing detection systems like protective ribs and infrared sensors have limitations.
Innovation Solution
A system using two measuring devices on rotation shafts with a non-integer reduction ratio to detect the position and movement of a barrier leaf, allowing precise detection even in power outages, comprising magnets and sensors to measure angular positions and torque, and a control unit for managing movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic gates are actuated remotely from fixed stations, then ease of operation is improved, but safety deteriorates due to lack of automatic interruption mechanisms
Solution Approach 1:
The gate system performs self-diagnosis and self-protection by automatically detecting obstacles and interrupting motion without requiring manual intervention. The control unit continuously monitors motor current and encoder feedback to detect abnormal conditions and autonomously stops the gate, making the system self-protecting.
Solution Approach 2:
The system uses encoder feedback to continuously monitor gate position and motor current feedback to detect abnormal loads. This feedback mechanism enables the control unit to recognize obstacle detection conditions and automatically interrupt gate motion, resolving the safety issue while maintaining remote operation.
2Reliability
If protective ribs or infrared sensors are used for safety detection, then safety is improved, but device complexity increases
Solution Approach 1:
The existing motor and encoder components serve dual purposes: motor drive control and obstacle detection. The encoder that normally provides position feedback is also used to detect obstacles by monitoring unexpected position changes, eliminating the need for separate protective ribs or infrared sensors.
Solution Approach 2:
The obstacle detection function is merged with the existing motor control system. The control unit combines motor current monitoring and encoder position feedback into a unified obstacle detection algorithm, integrating safety functionality into the existing control architecture rather than adding separate systems.
3Device complexity
If manual intervention is required to interrupt gate motion, then device complexity is reduced, but response time deteriorates
Solution Approach 1:
The control unit continuously monitors motor current and encoder feedback throughout gate operation, maintaining constant surveillance for obstacle conditions. This continuous monitoring ensures immediate detection and automatic interruption upon obstacle contact, eliminating response delays associated with manual intervention.
4Measurement precision
If a non-integer reduction ratio is used in the transmission mechanism, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system changes the reduction ratio parameter from an integer to a non-integer value (e.g., 2.5:1) to optimize measurement precision. This parameter change allows the encoder to provide more precise position feedback by creating a more favorable resolution ratio between motor shaft rotations and gate leaf displacement, while the control unit compensates for the non-integer ratio through software calculations.
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 precise detection of the barrier's position and movement, providing safety by automatically interrupting motion upon impact, and ensuring accurate control even without power, reducing the risk of manual intervention.
Implementation Method 1
Both of these measuring devices comprise a magnet associated with the respective rotation shaft and a relative sensor adapted to intercept the variations in the magnetic field
Data Source
AI summary
A system for detecting the movement conditions of the leaf closing a barrier, the leaf being able to occlude a delimited opening or passage and in which the leaf itself is moved by a motor whose rotation shaft is associated with a motion transmission mechanism to the leaf. On the motor is present a first device for measuring the rotation of the rotation shaft, and a second measuring device is associated with a second rotation shaft being connected to the first shaft by a reduction gear with a reduction ratio that is non-integer.