Fan-cooled electrical machine with axial thrust compensation

摘要

A rotating machinery equipment is disclosed, comprising a rotating electrical machine having a stator (1) and a rotating shaft (7), whereon a rotor (11) is mounted. The machinery equipment further comprises a cooling fan (23) comprised of a rotating impeller (33) mounted on the rotating shaft (7) for co-rotation therewith. Cooling gas passages (45, 47) are provided for delivering compressed cooling gas through the stator and rotor. The cooling gas is delivered by the impeller (33) into a cooling-gas distribution chamber (31). The pressure of the cooling gas in the cooling-gas distribution chamber generates an axial force balancing the axial thrust generated on the electrical machine by the cooling gas flow.