Patent ID: 6450780
Filing Date: 2002-09-17
Classification: F04D,F16C,H02K

Abstract:
Method for generating over-pressure gas by means of a kinetic compressor which is coupled to a electric machine located on a shaft with the compressor and comprising a rotor with a first end and a second end whose rotational speed is greater than 20,000 rpm, in which method the shaft is provided with magnetic bearings, the electric machine is placed centrally on the shaft with respect to a first compressor stage and a second compressor stage of the compressor, the rotor is mounted on a magnetic bearing at least in an axial direction and the magnetic bearing is selected to be of the active type, characterized in that at least one of the first and the second compressor stages is selected as a mix-flow compressor, the first and second ends of the rotor are used at least partly as counter surfaces for the magnetic bearing, that a squirrel-cage induction motor equipped with a coated rotor is used as the electric machine, and that the electric machine is supplied with a necessary frequency generated by an inverter.