Speed and pressure of the screw compactor
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Is there such a concept for screw compressors as increasing speed first and then pressure, or decreasing pressure first and then speed? Could someone provide the performance curve of a screw compressor?
In modern screw compressors, the control principle involves a star connection at the initial stage. The characteristic of this star connection is that it results in low voltage and low torque; as a result, the rotation speed increases gradually from 0 to the normal speed. This process usually takes only a short time, up to 10 seconds at most. During this time, the pressure does not rise at all. In my opinion, screw compressors are designed such that pressure begins to increase only after the screws reach their rated rotation speed
As for what you said about reducing pressure first and then reducing speed, that’s also correct; after all, a screw air compressor will first unload before shutting down when the stop button is pressed, which can be considered as reducing pressure first and then reducing speed