| 摘要 |
A first minute gap (18) is formed between the front end of a ventilation fan (16) and a first bracket (8) and a second minute gap (21) is formed between the front end of a partition member (19) and a second bracket (11); a first aperture (9a) is provided in a location at the inner periphery further inward than the vanes (16b) on the bearing bracket (9); a current of cooling air is formed by introduction of external air by the ventilation fan from this aperture; this current of cooling air is again discharged to the outside through a ventilation passage (8a) of the first bracket and a ventilation passage (1a) on the outer peripheral side of the stator core (1); in addition, a second aperture (11b) is provided in the second bracket (11), a current of cooling air is formed by introduction of external air by the ventilation fan from the second aperture (11b); and this current of cooling air is again discharged to the outside through the ventilation passage (3a) of the rotor core (3), the ventilation passage of the first bracket and the ventilation passage on the outer peripheral side of the stator core. |
