Patent ID: 6488486
Filing Date: 2002-12-03
Classification: F04D,H02K

Abstract:
A motor-operated fan for circulating a fluid in a heat exchange plant of large dimensions, the fan including a mobile part rotating about m axis of the motor-operated fan, the mobile part including at least one rotor of an electric moor driving the motor-operated fan and fan blades integral with the rotor, and a rotating fixed part comprising at least one stator of the electric motor, the fan comprising:a part at least of the electric motor that includes the stator is arranged in an enclosed chamber, and the motor-operated fan comprises means for guiding a first fluid passing through one at least of the mobile part and fixed part of the motor-operated fan between a first zone with a first pressure of the first fluid outside the enclosed chamber on a first side of the blades of the motor-operated fan in the al direction, and a second zone with a second pressure on a second side of the blades of the motor-operated fan outside the enclosed chamber, the second pressure being less than the fist pressure and means for circulating a second fluid contained in the enclosed chamber, in thermal contact with the guiding means for the first fluid, in such a way as to cool at least a part of the electric motor by circulation of the first and of the second fluids.