Patent Number: 6,296,441

Title: Compressors

Abstract: An oil free high speed gas compressor driven by a high frequently electric motor with a soft magnetic armature which holds permanent magnets arranged peripherally and a centrifugal impeller overhung at one or at each end of the shaft of the armature of the motor, wherein the temperature of the armature is held within the characteristic temperature of its permanent magnets by a flow of cooling liquid through a central bore in the armature or by a flow of cooling liquid through a central drilling through a tie-bolt in thermal contact with a bore in the armature.

Inventors: Gozdawa; Richard Julius (Uxbridge, GB)

Assignee: Corac Group PLC

International Classification: F04D 25/06 (20060101); F04D 25/02 (20060101); F04D 29/58 (20060101); F04D 29/04 (20060101); F01D 025/08 ()

Expiration Date: 10/02/2018