Patent ID: 7071586

Claim:
An electric rotating machine comprising a stator, a rotor rotating in opposite relation with the stator, a rotating shaft rotating with the rotor, a fan disposed in the vicinity of the end portion of the rotating shaft, a stator ventilation duct disposed in the stator, a rotor ventilation duct disposed in the rotor, and an entrance port communicated with the rotor ventilation duct, wherein: gas that has passed through the a rotor ventilation duct and the stator ventilation duct is guided to a first cooler, then compressed by a fan is guided to a second cooler after it is passed through the end portion of the stator; a first ventilation passage guides the gas that has passed through the second cooler to the entrance port, without passing through the fan; the second cooler, different from the first cooler, is disposed on the ventilation passage between the rotor and the fan or between the stator and the fan; part of the air that has passed through the second cooler is guided to the stator ventilation duct; and part of the air that has passed through the first cooler is guided to a gap between the rotor and stator.