Banknote Storage Reel Speed Control via Radius Feedback
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Solution Overview
Problem
Existing banknote temporary storage modules in automated teller machines face issues with maintaining consistent linear speeds of large and small reels, leading to slack or tightened tape coiling, which causes device malfunctions, increased manual maintenance, and motor load damage due to inaccurate radius calculations and empirical value estimations.
Innovation Solution
A method for controlling the rotation speed of the reels by using encoding disks and sensors to monitor rotation angles, calculate the current radius of the large reel, and adjust angular speeds to match the linear speed of the small reel, ensuring consistent operation and preventing faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the linear speed of the small reel is greater than the linear speed of the large reel, then the small reel releases the tape coiling faster, but the tape coiling becomes slack and causes banknote jam
Solution Approach 1:
The patent employs feedback control by continuously monitoring the rotation angles of both reels through encoding disks and sensors, calculating the actual linear speeds based on real-time radius measurements, and dynamically adjusting motor speeds to maintain consistent linear velocities, thereby preventing tape coiling from becoming slack or overly tight
Solution Approach 2:
The system dynamically changes the operating parameters (angular speeds) of both motors based on real-time calculations of reel radii and required linear speeds, adjusting the speed parameters to ensure that the linear speeds of both reels remain consistent throughout the banknote delivery process
2Speed
If the linear speed of the large reel is greater than the linear speed of the small reel, then the large reel retracts the tape coiling faster, but the tape coiling becomes tightened and increases motor load
Solution Approach 1:
The feedback control system continuously monitors the rotation angles and calculates the actual linear speeds of both reels, comparing them against the target speed, and dynamically adjusts the motor speeds to prevent the tape coiling from becoming tightened and overloading the motors
Solution Approach 2:
The system dynamically adjusts the speed parameters of both motors based on real-time calculations, changing the angular speed parameters to maintain optimal linear speed consistency and prevent excessive motor load
3Device complexity
If the radius of the large reel is estimated using empirical values, then the control method is simple, but the linear speed consistency cannot be ensured
Solution Approach 1:
The patent replaces the empirical estimation method with a precise measurement and calculation system using encoding disks, sensors, and microcontroller-based computation to determine actual reel radii and linear speeds, substituting mechanical estimation with electronic measurement and mathematical calculation
Solution Approach 2:
The system performs self-measurement and self-adjustment by using the encoding disks and sensors to automatically detect reel rotation angles, calculate current radii, determine required linear speeds, and adjust motor speeds without external intervention, achieving both precision and automation
4Speed
If the angular speeds of the first motor and the second motor are continuously adjusted based on estimated radius change, then the linear speeds are close to the path speed, but the tape coiling may still become slack or tightened
Solution Approach 1:
The system uses feedback control to continuously monitor the actual linear speeds calculated from real-time radius measurements and rotation angles, comparing them against the target path speed, and dynamically adjusting motor speeds to maintain precise consistency, thereby ensuring stable tape coiling tension
Solution Approach 2:
The patent implements dynamic speed adjustment by continuously changing the angular speeds of both motors based on real-time calculations of reel radii and required linear speeds, making the system adaptive to changing conditions and ensuring consistent linear speeds throughout operation
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 solution maintains consistent linear speeds of the reels, preventing banknote jams, reducing motor load, and enhancing the reliability and stability of the temporary storage module by accurately adjusting angular speeds based on real-time radius changes.
Implementation Method 1
a first sensor arranged corresponding to the first encoding disk and configured to monitor a rotation angle of the large reel, a second sensor arranged corresponding to the second encoding disk and configured to monitor a rotation angle of the small reel
Data Source
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Figure 3~5
Figure 6
AI summary
A banknote temporary storage module and a reel rotating speed control method thereof. The banknote temporary storage module comprises a large reel (201) driven by a first power motor, a small reel (202) driven by a second power motor, a coiling tape (208), a first coded disc (203), a second coded disc (204), a first sensor (205), a second sensor (206) and a microcontroller. Two ends of the coiling tape are separately fixed on the large reel and the small reel and the coiling tape is retracted and wound between the large reel and the small reel. The first coded disc is fixed on a rotating shaft of the large reel. The second coded disc is fixed on a rotating shaft of the small reel. The first sensor is arranged corresponding to the first coded disc and is used for monitoring the rotating angle of the large reel. The second sensor is arranged corresponding to the second coded disc and is used for monitoring the rotating angle of the small reel. The microcontroller is used for calculating, according to output signals of the first sensor and the second sensor, the length of the coil tape released by the small reel each time the large reel rotates for one circle, and further calculating the current radius of the large reel, and thus angular velocities of the large reel and the small reel are controlled and the linear velocity of the large reel is enabled to be consistent with that of the small reel.