Compressor Speed Prediction Under Motor Current Limits
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Solution Overview
Problem
Compressor modules in compressed-air supply systems face challenges in providing sufficient compressed air under varying operating conditions while maintaining efficient and environmentally friendly operation, particularly in situations with high mechanical load that can exceed the maximum current consumption limits of the electric motor.
Innovation Solution
A compressed-air supply system with a controller that predicts and adjusts the operating mode and speed of the electric motor to prevent exceeding maximum current consumption by predicting the required power consumption and selecting appropriate speeds or operating modes, using input signals such as pressure and request signals to determine control signals for valves and motor speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operates at high speed to provide sufficient compressed air under high mechanical load, then the compressed air supply is adequate, but the current consumption exceeds the maximum current limit of the electric motor
Solution Approach 1:
The controller predicts the future power consumption of the compressor based on current operating parameters (speed, outlet pressure, ambient pressure) and提前 adjusts the operating mode or speed before the current limit is exceeded. This predictive control prevents excessive current draw while maintaining adequate compressed air supply.
Solution Approach 2:
The system dynamically switches between different operating modes (e.g., single-stage and two-stage compression) or adjusts the compressor speed based on predicted power consumption requirements. This dynamic adaptation allows the compressor to maintain productivity while staying within current consumption limits.
2Use of energy by moving object
If the compressor speed is reduced to limit current consumption, then the current draw stays within maximum limits, but the compressed air supply becomes insufficient
Solution Approach 1:
By predicting future power consumption based on current trends and operating conditions, the controller can提前 reduce speed or switch modes before compressed air supply becomes insufficient, maintaining both current limits and productivity.
Solution Approach 2:
The system changes operating parameters such as switching between single-stage and two-stage compression modes, or adjusting ambient pressure compensation, to maintain adequate compressed air supply while reducing current consumption to within acceptable limits.
3Productivity
If the compressor operates continuously at maximum speed to ensure adequate compressed air supply, then the compressed air availability is guaranteed, but the acoustic behavior deteriorates and energy efficiency decreases
Solution Approach 1:
The compressor operates dynamically at optimal speeds rather than continuously at maximum speed. The controller adjusts speed and operating mode based on actual compressed air demand and predicted power consumption, reducing acoustic noise while maintaining adequate supply.
Solution Approach 2:
The system uses feedback from pressure sensors and power consumption monitoring to continuously adjust compressor operation. This closed-loop control ensures adequate compressed air supply while minimizing acoustic noise and improving energy efficiency by avoiding unnecessary high-speed operation.
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
Ensures reliable and efficient operation by preventing excessive current draw, maintaining consistent performance without speed changes during the function cycle, improving acoustic behavior, and optimizing power consumption.
Implementation Method 1
the motor electronics system controls the current supply to the coils of the stator (also referred to as stator coils below) via circuit breakers such that the stator coils are in turn periodically supplied with current in such a way that a rotating magnetic field is produced, this causing synchronous rotation of the rotor fitted with permanent magnets due to magnetic forces
Implementation Method 2
compressors are required for generating compressed air
Data Source
AI summary
A compressed-air supply system includes a compressed-air consumer, compressed-air lines, electrically controllable valves, a controller for actuating the valves, a compressor or compressing device with an electric motor as a drive, and a pressure reservoir. The compressed-air consumer is pneumatically connectable to the compressor and/or the pressure reservoir via the lines and the valves such that the system is operable in an open or a closed operating mode. The controller is configured, in response to a request signal, to predict an output pressure at the output of the compressor for the time T at which a state of the pressure consumer corresponding to the request signal is reached. Depending on the predicted output pressure, the controller activates either the open or closed operating mode or specifies one of a plurality of specified target speeds for speed control of the motor or activates an operating mode and specifies a target speed.