Banknote Feed Rate Control Without Encoders
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Solution Overview
Problem
Conventional banknote discriminators face issues in maintaining a consistent banknote feed rate due to slippage or delay, despite maintaining a predetermined motor revolution rate, leading to inefficiencies and increased complexity and cost.
Innovation Solution
An apparatus and method that utilize a banknote sensing unit to detect and calculate the actual banknote feed rate, adjusting the motor revolution rate based on the calculated feed rate to maintain a target feed rate without relying on encoders and their peripheral circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motor revolution rate is maintained at a predetermined target rate using an encoder, then the motor speed control precision is improved, but the device complexity and cost increase due to encoders and peripheral circuits
Solution Approach 1:
The patent extracts and removes the encoder and its peripheral circuits from the motor speed control system. Instead of using an encoder to measure motor revolution rate, the system uses a banknote sensing unit to detect the actual feed rate of banknotes, thereby eliminating the complexity and cost associated with encoders while maintaining control capability.
Solution Approach 2:
The patent introduces a banknote sensing unit as an intermediary element to measure the actual feed rate. Rather than directly measuring motor speed with an encoder, the system uses the sensing unit to detect banknote passage, which indirectly provides feedback on the actual feed rate, simplifying the control system architecture.
2Stability of the object's composition
If the motor revolution rate is maintained at a predetermined target rate, then the motor operation stability is improved, but the actual banknote feed rate consistency deteriorates due to slippage or delay
Solution Approach 1:
The patent implements a feedback control mechanism where the banknote sensing unit continuously detects the actual feed rate by measuring the interval between successive banknotes. The controller compares this actual feed rate with the target feed rate and adjusts the motor revolution rate accordingly, ensuring that the actual banknote feed rate matches the target rate despite slippage or delay.
Solution Approach 2:
The patent replaces the mechanical feedback system (encoder measuring motor rotation) with a sensing-based system (banknote sensing unit detecting actual banknote passage). This substitution allows direct measurement of the output parameter (banknote feed rate) rather than inferring it from motor rotation, thereby improving reliability by accounting for slippage and delay.
3Measurement precision
If the encoder and peripheral circuits are used for motor control, then the motor speed control precision is improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the expensive encoder and its peripheral circuits from the system. By using the banknote sensing unit for feed rate detection instead, the system achieves the necessary measurement precision without the high manufacturing cost associated with encoders and their supporting electronics.
Solution Approach 2:
The patent employs a banknote sensing unit, which is a simpler and more cost-effective component compared to an encoder. The sensing unit provides the necessary measurement functionality at a lower cost, making the overall system more economical to manufacture while maintaining adequate precision for feed rate control.
Data Source
AI summary
An apparatus and method for controlling and/or maintaining a banknote feed rate are disclosed. The apparatus includes a motor configured to generate a driving force to feed or transfer a banknote, a banknote sensing unit configured to detect fed or transferred banknotes, and a controller configured to calculate a feed rate of the fed or transferred banknotes by analyzing a banknote sensing signal from the banknote sensing unit, and control the motor based on the calculated feed rate.