Chemical Injection Pump Motor Control for Voltage Variation
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Solution Overview
Problem
The inconsistency in voltage supplied to electric motor-powered pumps results in varying chemical output rates, affecting the volume of chemicals injected into a process due to the proportional relationship between voltage and motor RPM.
Innovation Solution
A system and method that utilize a controller to monitor electrical measurements such as voltage, current, and frequency, adjusting the motor's output parameters like duty cycle to maintain consistent chemical injection by compensating for power variations, ensuring consistent chemical delivery regardless of changes in voltage or load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is allowed to vary naturally with battery charge state, then the system operates without additional control complexity, but the chemical injection rate becomes inconsistent
Solution Approach 1:
The system continuously monitors the actual chemical injection rate and compares it to the target rate, then adjusts the pump motor speed accordingly to maintain consistent injection despite voltage variations from battery charge state changes
Solution Approach 2:
The control system dynamically adjusts motor operating parameters (speed, power) based on detected voltage variations and measured injection rates, transforming the inconsistent voltage input into consistent chemical output through real-time parameter modification
2Quantity of substance
If the pump runs longer to compensate for low voltage, then more chemical is injected during low power periods, but the total injection volume becomes inconsistent
Solution Approach 1:
The system dynamically adjusts pump motor speed based on real-time voltage measurements and actual injection rate feedback, optimizing the balance between injection volume accuracy and process productivity by running faster when voltage is high and slower when voltage is low, rather than using fixed timing
3Reliability
If the pump runs shorter to avoid over-injection during high voltage, then injection consistency improves, but total chemical delivery may be insufficient
Solution Approach 1:
The system uses feedback from flow meters or injection rate sensors to continuously monitor actual chemical delivery and adjusts motor speed accordingly, ensuring both consistency and adequate total volume by compensating for high-voltage periods with adjusted speed rather than truncated runtime
Data Source
AI summary
A method and system for maintaining consistent output for a pump powered by an electric motor, is provided, including: sending electrical measurements regarding power applied to the motor to a controller; determining if the electrical measurements indicate a power variation; changing the parameters of output from the motor to compensate for the variation. The system uses a controller configured to receive electrical measurements regarding power input to the motor, to determine if the electrical measurements indicate a power variation; and to change the parameters of output from the motor to compensate for the variation.