Adaptive Motor Drive Pressure Control
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Solution Overview
Problem
Existing motor drive systems for fluid pumping systems face challenges in maintaining pressure control across a wide range of pump pressures and applications, often requiring complex calibration and multiple variants of motor drives, which increases costs and complexity.
Innovation Solution
A motor drive system that includes a controller to determine proportional and integral errors based on pressure setpoints, using a gain factor to calculate motor speed and generate control signals for an inverter to maintain pressure, allowing for adaptive control and reduced processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex calibration and multiple variants of motor drives are used to maintain pressure control across wide range of pump pressures, then pressure control precision is improved, but device complexity and cost increase
Solution Approach 1:
The system dynamically adjusts control parameters (proportional gain, integral gain, error bands) based on operating conditions such as pressure setpoint and pump head. This allows a single motor drive to adapt to wide ranges of pump pressures without requiring multiple variants or complex calibration procedures, resolving the contradiction between pressure control precision and device complexity
Solution Approach 2:
The control system transitions from static calibration to dynamic adaptation by continuously adjusting control parameters based on real-time operating conditions. The proportional and integral error bands are dynamically modified according to the pressure setpoint and system state, enabling precise pressure control across varying pump pressures while maintaining a standardized single-variant motor drive design
2Measurement precision
If complex calibration and multiple variants of motor drives are used to maintain pressure control across wide range of pump pressures, then pressure control precision is improved, but manufacturing cost increases
Solution Approach 1:
The motor drive is designed as a universal controller that can handle multiple applications and pressure ranges through dynamic parameter adjustment. By implementing adaptive control algorithms that modify proportional and integral gains based on operating conditions, a single standardized motor drive variant can replace multiple application-specific variants, reducing manufacturing costs and inventory requirements while maintaining precise pressure control
Solution Approach 2:
The system achieves precise pressure control across wide pump pressure ranges by dynamically changing control parameters rather than requiring hardware variations. This software-based adaptation eliminates the need for multiple calibrated variants, reducing manufacturing complexity and cost while maintaining high pressure control precision across different applications
3Measurement precision
If high processing capacity controllers are used to implement complex control algorithms, then control precision is improved, but device complexity and cost increase
Solution Approach 1:
The control algorithm implements selective processing by focusing computational resources on the most critical control functions. Rather than using excessively complex algorithms, the system applies proportional and integral control with dynamically adjusted parameters and error bands, achieving precise pressure control with moderate processing requirements and simpler controller hardware
Data Source
AI summary
A motor drive and method to control a motor in a fluid system. The method may comprise determining a pressure; determining a proportional error as a limited difference between the pressure and a pressure setpoint; determining an integral step as a limited proportional error; determining an integral error as a limited sum of the integral step and a preceding unbound integral error; determining an error as the product of the integral error, the proportional error, and a gain factor; and generating a control signal to cause the inverter to output a motor voltage to drive the motor and maintain the pressure about the pressure setpoint.