Kaeser Compressors
A new variable-frequency-drive compressor
With an advanced SynRM motor-drive combination, the new SFC 18 is a 25-hp variable frequency drive compressor that delivers 31–156 ft3 /min of compressed air with superior part-load efficiency, longer service life and reduced maintenance costs, says the manufacturer. Developed in partnership with Siemens and specifically designed to work with this company’s SFC models, the SynRM motor-drive combination achieves top-tier IES2 classification. This results in better specific performance, especially in the part-load conditions that call for variable-speed compressors. SynRM motors do not use aluminum, copper or expensive rare earth metals in the rotors. Instead, they are made of electrical steel and feature a special profile. With this unique rotor design, the motors run cooler, resulting in lower bearing and winding temperatures and increased motor life. And because there are no magnets in the rotor, motor service is safer and easier. — Kaeser Compressors, Inc., Fredericksburg, Va.