How a Variable Speed Screw Compressor Works
some previous discussions about Screw Compressor, in the type of Screw Compressor with variable speed is also known as Variable Frequency Drive compressor (VFD).
In the type of Screw Compressor with variable speed, it is also known as a Variable Frequency Drive (VFD) compressor, which can adjust the speed of the motor as a means of driving the engine in the hope of being able to adjust to the air demand, so as to save energy. How Variable Speed Technology Works In accordance with its main role, a variable speed drive compressor can work to store and maintain constant air pressure. The variable speed compressor will adjust the motor speed to meet your production air requirements. A variable speed compressor can work at a flow that can fluctuate until there is less airflow. This process is called that Screw Compressor Variable speed can save energy. Variable Speed Inverter The inverter in a variable speed screw compressor can speed up or slow down the motor in the compressor. This inverter is different from traditional AC compressors. This is because the inverter provides the air screw compressor with a certain rotating power and voltage to save energy. SSource: https://www.alup.com/en/screw-compressors/learn-more-about-screw-air-compressors/what-is-variable-speed/how-variable-speed-works 
