FANCOOLED ELECTRICAL MACHINE WITH AXIAL THRUST COMPENSATION

摘要

A rotating machinery equipment is disclosed, comprising a rotating electrical machine having a stator and a rotating shaft, whereon a rotor is mounted. The machinery equipment further comprises a cooling fan comprised of a rotating impeller mounted on the rotating shaft for co-rotation therewith. Cooling gas passages are provided for delivering compressed cooling gas through the stator and rotor. The cooling gas is delivered by the impeller into a cooling-gas distribution chamber. 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.

主权项

1. A rotating machinery equipment comprising a rotating electrical machine comprising:
a stator; a rotating shaft; a rotor mounted on the rotating shaft and rotating therewith; a cooling fan comprised of a rotating impeller having a gas inlet and a gas outlet and mounted at a first end of the rotating shaft and rotating therewith; and cooling gas passages for delivering compressed cooling gas through the stator and rotor;wherein a cooling-gas distribution chamber is provided between the cooling fan and the stator and rotor, in fluid communication with the cooling fan and the cooling gas passages, compressed cooling gas delivered by the cooling fan being received in the cooling-gas distribution chamber and distributed therefrom to the cooling gas passages; andwherein the cooling fan is provided with a thrust surface facing the stator and rotor, gas pressure in the cooling-gas distribution chamber acting on the thrust surface, generating an axial force (AT) on the rotating shaft, the axial force being oriented in a direction opposite the cooling gas flow through the stator and rotor.