ATM Stacking and Dispensing Module with DC Motor Current Control
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Solution Overview
Problem
Conventional ATMs face challenges in efficiently handling cash, including high manual handling costs, extensive security issues, and inefficiencies in cash recycling, particularly in handling banknotes of different denominations and quality, leading to increased operational expenses and user intervention.
Innovation Solution
A compact stacking and dispensing module for banknote storage units, utilizing precise DC motor control, active stacking wheels, and intelligent pressure control to facilitate high-speed banknote stacking and dispensing with reduced sensor usage, lower weight, and power consumption, while adapting to various banknote thicknesses and qualities, and incorporating a drum storage unit for non-accepted banknotes to minimize user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional ATMs use manual handling and transportation for cash, then security issues are extensive and operational expenses are high, but automation capability is limited
Solution Approach 1:
The system enables self-service through automatic detection, sorting, and stacking of banknotes. The detection unit automatically identifies banknote properties, the sorting mechanism automatically directs notes to appropriate storage, and the stacking mechanism automatically organizes notes in cassettes, eliminating manual handling and its associated security risks
Solution Approach 2:
Manual mechanical handling is replaced with an automated system combining detection units, sorting mechanisms, and stacking mechanisms. The detection unit uses sensors to identify banknote characteristics, the sorting mechanism uses automated routing, and the stacking mechanism uses controlled mechanical arms or conveyors to organize notes, replacing all manual operations with automated mechanical and electronic systems
2Productivity
If ATMs handle banknotes of different denominations and quality manually, then operational efficiency is reduced, but handling flexibility is maintained
Solution Approach 1:
The detection unit continuously monitors banknote properties such as denomination, quality, and condition. This feedback information is used by the control system to automatically adjust sorting decisions and stacking positions, enabling the system to efficiently handle diverse banknote types while maintaining adaptability to different denominations and quality levels
Solution Approach 2:
The system is designed with universal handling capabilities that can process multiple denominations and quality levels of banknotes through a single integrated pathway. The detection unit identifies various note types, the sorting mechanism routes different denominations to appropriate cassettes, and the stacking mechanism adapts to different note characteristics, allowing one system to handle all banknote varieties efficiently
3Manufacturing precision
If DC motors are used to drive stacking and dispensing wheels, then precise control is achieved, but power consumption increases
Solution Approach 1:
The DC motors operate in periodic cycles rather than continuously. The stacking mechanism activates only when banknotes need to be stacked, and the dispensing mechanism activates only when notes need to be dispensed. This periodic operation maintains precise control capability while significantly reducing overall power consumption compared to continuous operation
Solution Approach 2:
The system uses dynamically controlled DC motors that adjust their speed and torque output based on real-time operational requirements. The motors operate at variable speeds rather than constant speed, matching power output to the actual loading conditions and operational demands, thereby reducing energy consumption while maintaining precise control during active operations
4Measurement precision
If multiple sensors are used for detection and control, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
Multiple detection functions are merged into a single integrated detection unit. The detection unit combines sensors that identify banknote denomination, quality, condition, and other characteristics into one consolidated system, maintaining comprehensive measurement precision while reducing the number of separate sensor assemblies and simplifying the overall device architecture
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
The solution achieves a robust, efficient, and cost-effective cash handling system with low failure rates, reduced manual intervention, and improved cash recycling capabilities, enhancing the overall efficiency and reliability of ATM operations.
Implementation Method 1
The rotation of the stacking wheel is configured to be controlled by a first direct current (DC) motor (20). The rotation of the dispensing wheel is configured to be controlled by a second DC motor (22)
Data Source
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Figure 6~7
AI summary
A stacking and dispensing module (2) for use in an automatic teller machine (4), the module is configured to be arranged in connection with a banknote storage unit (6) comprising a banknote tray (8) on which banknotes (10) are stacked, the stacking and dispensing module (2) is configured to be in a banknote stacking mode, when banknotes are stacked in said storage unit (6), and in a banknote dispensing mode, when banknotes are dispensed from said storage unit (6). A stacking wheel member (12) is active both during the banknote stacking mode and during the banknote dispensing mode, and that the rotation of the stacking wheel member (12) is configured to be controlled by a first direct current (DC) motor (20), and the rotation of a dispensing wheel member (16) is configured to be controlled by a second DC motor (22). The module further comprises: -a current measuring unit (24) configured to measure the currents applied to drive said first and second DC motors (20, 22) and to generate current signals (26, 28) in dependence thereto, -a control unit (30) configured to receive said current signals (26, 28), wherein the control unit (30) is configured to evaluate said current signals (26, 28) and to determine control signals (32, 34) for various functions of said module in dependence of said evaluation, and to apply said control signals for controlling said functions.