A centrifugal compressor is a type of dynamic compressor, or turbocompressor, and is often used in industries where continuous performance and reliability are of the utmost importance.
In modern configurations of centrifugal air compressors, ultra-high speed electric motors are used to drive the rotating impeller, which draws in the air. The use of an electric motor results in a compact compressor without a gearbox and an associated oil-lubrication system. Without an oil-lubrication system, the compressor is appropriate for applications that require 100 percent oil-free air.
Industries that rely on oil-free, high-speed centrifugal compressors include industrial manufacturing, electronics, pharmaceuticals and the automotive industry, among others. In addition to oil-free air considerations, the following design features affect energy efficiency and reliability in oil-free, high-speed drive centrifugal compressors:
- Three-stage compression results in 4-9% more air flow per unit of power, making it the most efficient design for centrifugal compressors.
- Titanium impellers have superior fatigue properties resulting in faster load-unload cycles. When transition time between load and unload is reduced, power consumption is also reduced.
- A permanent magnet motor reduces energy losses and cooling requirements and maintains consistent motor efficiency at full load and partial load.
- Optimally-sized coolers depressurize the compressor’s internal air volume between compression stages; this ensures minimal loss of compressed air.
- Stable internal cooling temperatures extend the life of the electronic power components such as the frequency inverter and the motor, and increases drive efficiency.
Learn more about Atlas Copco oil-free, high-speed centrifugal compressors by following the links or download a copy of our free air compression manual.
5 min
