You can find rotary screw compressors in many shapes and sizes – from models for small workshops to massive machines that keep entire factories running. They can come with different types of drives (belt drive, gear drive or direct drive), and you have the option of choosing an oil-injected or an oil-free compressor. You would use the former when air quality is less important and the latter if your applications require very clean air.
You can find more information on all of these technologies in our rotary screw compressor ebook.
In this guide, however, we want to primarily focus on comparing fixed-speed compressors and those models with a variable speed drive (VSD).
