| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling structure for a rotary dynamo-electric machine, capable of improving a cooling fan efficiency by suppressing the generation of a swirling flow (vortex) on the suction side of the fan. SOLUTION: A cylindrical cooling air guide 27 for interrupting the vortex route of a cooling air generated at a suction side of a cooling fan 22 is provided on an outer periphery of a blade piece 23 of the fan. A rear end of the guide and a front end of the piece of the fan are superposed axially, and their superposed width d1 is set to about 30% of a width d1 of the piece of the fan. The cylindrical cooling air guide gradually enlarging from the front end toward the rear end in its bore is provided at the rear end of the guide, so that the cooling air duct of the fan discharge side is enlarged gradually.
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