What is the Difference between a Fixed Speed and Variable Speed Compressor

June 15, 2021


Variable Speed Rotary Screw Compressors

The variable speed compressors work to maintain a constant air pressure, while the motor speed is adjusted to meet the production of air required. In fact, variable speed machines can reduce engine revolutions and align with actual air demand, therefore saving energy.

Fixed Speed Rotary Screw Air Compressor

Unlike variable speed air compressors, fixed speed compressors are either running at 100% or are off. They are ideal in applications where a constant demand for compressed air is needed. The machine works with the same number of engine revolutions, unless it is switched off. Fixed speed air compressors always run at full capacity and therfore could produce more air than required with a wast of energy.

Advantages of Variable Speed

  • Reduced energy consumption by adapting the motor power to the air demand
  • The investment difference compared to a fixed speed compressor pays for itself with lower energy consumption
  • When the variable speed screw compressor works at a lower power speed it is quieter than a fixed speed machine
  • Constant system pressure, and lower system pressure reduces the risk of leaks
  • Longer component life
  • Low inrush current during motor starts

Original Parts


Ceccato Compressors


Oil-Free Compressors