Kaeser Compressors' new SFC 18 variable frequency drive was developed in partnership with Siemens and is a 25 hp unit with an advanced SynRM motor-drive combination designed to work with Kaeser's SFC models. The company says it delivers 31-156 cfm and boasts superior part-load efficiency, longer service life, and reduced maintenance costs. The SynRM motors are made of electrical steel and feature a special profile, which allow the motors to run cooler, resulting in lower bearing, winding temperatures, and increased motor life.