Patent ID: 7294943

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 first cooler, a second cooler disposed on the axial line extending in the first cooler to the rotating shaft, a rotor ventilation duct disposed in the rotor, a stator ventilation duct disposed in the stator, and an entrance port communicated with the rotor ventilation duct, wherein gas that has passed through the rotor ventilation duct is guided to the stator ventilation duct; the gas that has passed through the stator ventilation duct is guided to the first cooler; the air that has passed through the first cooler is guided to the second cooler by way of the end portion of the stator; and part of the air that has passed through the second cooler is guided to the entrance port of the rotor ventilation duct, without passing through the fan.