Dispensing Pump Stall Reset Using Current-Sensed Motor Reversal
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Solution Overview
Problem
Existing electronically keyed fluid dispensing systems face issues with stalled pumps due to improper installation of refill containers, which can lead to damage and excess fluid dispensing, and lack reliable methods for automatic reset.
Innovation Solution
The system detects a user's hand to initiate the pump actuator and uses a current sensor to monitor the motor's current, reversing the motor shaft to return the pump actuator to its starting position when a stall condition is detected, thereby automatically resetting the pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump actuator is manually reset by the user, then the pump can be returned to operation, but the system remains unreliable and may cause further damage
Solution Approach 1:
The system automatically detects pump stall conditions through current monitoring and performs self-reset by reversing the motor shaft direction, eliminating the need for manual user intervention and ensuring consistent, damage-free reset operations
Solution Approach 2:
The system continuously monitors motor current to detect stall conditions and uses this feedback to automatically trigger the reset sequence, creating a closed-loop control system that responds to actual pump status rather than requiring manual assessment
2Object-affected harmful factors
If the pump actuator stalls due to improper installation, then fluid dispensing stops, but damage to the motor assembly and excess fluid dispensing occurs
Solution Approach 1:
The system proactively detects stall conditions before they cause damage by monitoring motor current, and automatically reverses the motor shaft to prevent damage to the motor assembly and excess fluid dispensing by stopping the actuator at the appropriate position
3Reliability
If automatic detection and reset systems are implemented, then pump reset reliability improves, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical reset mechanisms with an electronic control system that uses current sensors and microcontroller logic to detect stalls and automatically reverse motor shaft direction, simplifying the overall system while improving reliability
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 method allows for reliable and automatic reset of stalled pumps without user intervention, preventing damage and excess fluid dispensing, and ensures proper installation of new refill containers.
Implementation Method 1
monitoring a current sensor associated with a motor that actuates the pump actuator
Data Source
AI summary
A system and related method is disclosed for resetting a stalled pump in a fluid dispensing system. In one embodiment, the presence of a user's hand is detected to start a pump actuator associated with a refill container. A controller associated with a motor actuates the pump actuator by rotating a motor shaft in a first direction. The current sensor is monitored and when the current sensor detects a predetermined level of current the motor shaft is reversed to a starting position.