Pump Motor Back-EMF Control for Precise Beverage Flow
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Solution Overview
Problem
Standard beverage dispensing systems rely on complex and expensive mechanical flow control devices to achieve precise fluid flow, which are bulky, require frequent recalibration, and lack accurate feedback, leading to fluctuations in flow rate and quality due to variables like vacuum, head height, and product depletion, resulting in inefficiencies and waste.
Innovation Solution
A closed-loop flow control system using an electric motor and Back Electro-Motive Force (BEMF) measuring control system that monitors and adjusts the motor's operation to maintain consistent fluid flow, eliminating the need for external flow control components and solenoid valves, and accounts for changes in fluid depletion and operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical flow control devices are used to achieve precise fluid flow, then flow precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical flow control devices with an electrical control system that uses pulse width modulation (PWM) to control the motor driving the pump. This substitution eliminates complex mechanical components like pistons, sleeves, springs, and adjustment screws while achieving precise flow control through electronic means. The motor controller adjusts the duty cycle of PWM signals to regulate motor speed and thereby control fluid flow rate precisely.
Solution Approach 2:
The patent implements a feedback mechanism using a flow sensor to monitor actual fluid flow and a controller to compare it with the desired flow rate. The controller adjusts the PWM duty cycle based on this feedback to maintain precise flow control. This closed-loop feedback system replaces the need for complex mechanical adjustment mechanisms while achieving and maintaining flow precision.
2Manufacturing precision
If mechanical flow control devices are used to achieve precise fluid flow, then flow precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive mechanical flow control devices with a more cost-effective electrical control system using PWM motor control and electronic flow sensing. This substitution reduces manufacturing costs by eliminating the need for precision-machined mechanical components, expensive materials, and complex assembly processes while maintaining flow precision through electronic control.
Solution Approach 2:
The patent employs cost-effective electronic components such as PWM controllers, flow sensors, and microcontrollers that are inexpensive to manufacture and replace if needed. These electronic components are generally cheaper than precision mechanical flow control devices and can be easily replaced or upgraded without specialized tooling or machining operations.
3Manufacturing precision
If mechanical flow control devices are used to achieve precise fluid flow, then flow precision is improved, but the system requires frequent recalibration
Solution Approach 1:
The patent implements continuous feedback from the flow sensor to the controller, which automatically adjusts the PWM duty cycle to maintain the desired flow rate. This real-time feedback and automatic adjustment eliminate the need for manual recalibration that would be required with mechanical flow control devices, as the system self-corrects for any deviations in flow rate automatically.
Solution Approach 2:
The system performs self-regulation and self-adjustment through the feedback control loop, automatically compensating for changes in system conditions without requiring external intervention or recalibration. The controller continuously monitors flow and adjusts motor speed accordingly, making the system self-sufficient and eliminating time-consuming manual recalibration procedures.
4Ease of operation
If BIB pumps operate under constant pressure, then pump operation is simplified, but flow rate control accuracy deteriorates
Solution Approach 1:
The patent transitions from static constant-pressure operation to dynamic variable-speed operation. The motor controller dynamically adjusts the pump speed based on feedback from the flow sensor, allowing the system to maintain accurate flow rate control while simplifying operation. The pump operates at varying speeds rather than constant pressure, with the controller automatically adjusting speed to achieve the desired flow rate.
Solution Approach 2:
The patent uses feedback from the flow sensor to continuously monitor actual flow rate and adjust motor speed accordingly. This feedback control allows the pump to operate simply through automatic control while maintaining high flow rate accuracy, as the system self-adjusts to compensate for pressure variations and other affecting factors.
5Manufacturing precision
If standard dispensing valves are used to control flow, then initial flow precision is achieved, but flow precision deteriorates over time
Solution Approach 1:
The patent implements continuous feedback from the flow sensor to the controller, which automatically adjusts motor speed to maintain the desired flow rate. This real-time feedback compensates for changes in system conditions such as product depletion, viscosity changes, and temperature variations, maintaining flow precision stability over time without the deterioration experienced with mechanical flow control devices.
Solution Approach 2:
The system continuously self-adjusts through the feedback control loop, automatically compensating for drift and changes in operating conditions. This self-correction capability maintains reliable flow precision over extended periods without requiring manual recalibration or intervention, unlike mechanical flow control devices that drift over time.
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 system provides precise, self-adjusting flow control, reduces component costs and complexity, and minimizes waste by maintaining consistent flow rates and beverage quality over time, even as product levels decrease, without the need for frequent recalibration.
Implementation Method 1
A closed-loop flow control system using an electric motor and Back Electro-Motive Force (BEMF) measuring control system that monitors and adjusts the motor's operation
Implementation Method 2
A closed-loop flow control system using an electric motor and Back Electro-Motive Force (BEMF) measuring control system
Data Source
AI summary
The present system generally relates to a fluid flow system where a controller and motor pump assemblies are used to optimize the control of fluid flow through the system. The controller samples the back electromotive force of the motor and pump assemblies and is able to utilize the sampled back electromotive force in conjunction with predefined target back electromotive force values, preferably empirically determined and tuned to an individual motor and for a select fluid, to tune the voltage applied to the system, control the back electromotive force of the system and, by extension, control the flow of fluid.