Systems and processes are provided for gas separation using high-speed permanent magnet variable-speed motors to accelerate and decelerate centrifugal compressors suitable for use in pressure swing adsorption (PSA) or vacuum pressure swing adsorption (VPSA) processes....http://www.google.com.au/patents/US7785405?utm_source=gb-gplus-sharePatent US7785405 - Systems and methods for gas separation using high-speed permanent magnet motors with centrifugal compressors
