Hydraulic Pump Motor Speed Control for Demand-Based Flow
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Solution Overview
Problem
Existing motor control methods result in unnecessary energy consumption due to maintaining a steady state rotation speed, which delivers excess flow rate to hydraulic actuators, leading to recirculation and inefficiency.
Innovation Solution
A method for controlling motor rotation speed based on detecting control signals, calculating required flow rates, and adjusting motor speed to match actual demands, optimizing energy consumption by minimizing unnecessary rotation speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is maintained at a steady state rotation speed to guarantee maximum flow rate delivery to all actuators, then the actuators can operate at maximum capacity, but most of the flow rate is recirculated without useful work resulting in unnecessary energy consumption
Solution Approach 1:
The motor rotation speed is made dynamic rather than steady, allowing it to adapt to varying operational demands. The control system continuously adjusts the motor speed based on real-time detection of actuator control signals, ensuring the motor operates at the minimum necessary speed to satisfy current requirements rather than maintaining a constant high speed for all possible scenarios.
Solution Approach 2:
The system changes the operational parameters of the motor by adjusting its rotation speed based on detected control signals. By monitoring which actuators are active and calculating the required flow rate, the system modifies the motor speed parameter to match actual demands, preventing unnecessary energy consumption while maintaining actuator functionality.
2Use of energy by moving object
If the motor rotation speed is reduced to minimize energy consumption, then energy efficiency improves, but the pump may not deliver sufficient flow rate to meet actuator demands
Solution Approach 1:
The system implements feedback control by detecting control signals from actuators and using this information to adjust motor rotation speed. The control system receives feedback about which actuators are active and calculates the appropriate motor speed to deliver the required flow rate, ensuring both energy efficiency and sufficient productivity.
Solution Approach 2:
The control system performs preliminary calculation of the required flow rate based on detected control signals before adjusting the motor speed. This allows the system to proactively set the motor rotation speed to match the anticipated demand, preventing both under-delivery and excessive energy consumption.
Data Source
AI summary
A method for controlling the rotation speed of a motor that includes the steps of preparing a first function which puts in relation the flow rate delivered by a pump with the pump rotation speed, preparing a second function which puts in relation a flow rate delivered by a flow rate control valve with a level of the control signal received, detecting the presence of control signals and the level of each control signal, using the second function, calculating the flow rate delivered by each flow rate control valve as a function of the level of the control signal received, calculating a total required flow rate, as the sum of the flow rates delivered by each flow rate control valve, using the first function, calculating a required rotation speed of the pump and adjusting the speed of rotation of the motor.