Dynamo-electric machine
AssigneeHitachi, Ltd.
InventorsKenichi Hattori, Kazumasa Ide, Akiyoshi Komura, Takashi Watanabe, Ryoichi Shiobara, Yasuomi Yagi, Kengo Iwashige, Keiji Kobashi
Life of this patent
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Abstract
An electric rotating machine capable of lowering the temperature of a rotor disposed, wherein at least one of closed ventilation loops for cooling is formed, one of the loops constituting a ventilation passage communicating with an exhaust side through a heat source of the end of the generator to a cooler, thereby to supply cooling wind to the rotor after it passes through the cooler.
Claims6
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.
Dependencies are inferred from the claim text.