To provide a totally-enclosed motor that produces less fan noise and is easy to cool.
The totally-enclosed motor includes: a stator core 1; a rotor core 7 disposed inside the stator core 1; a first bearing 4 and a second bearing 5 placed at both ends of the stator core 1 through brackets 20, 21, 22; a rotor shaft 6 on which the rotor core 7 is installed and which is rotatably supported in the first and second bearings 4, 5; an air duct 17b formed on the periphery of the stator core 1; a heat exchanger 23 provided in the air duct 17b; an outside air inlet 20a provided in part of the bracket 20; and a ventilation fan 29 having an outer fan blade 29a provided on a fan main plate 29d fit on the rotor shaft 6. The totally-enclosed motor is so constructed that the relation between the outside diameter ΦD of the outer fan blade 29a and the outside diameter Φd of the outside air inlet 20a is expressed as Φd/ΦD=0.5 to 0.8.
KOYAMA YASUHEI
HASHIMOTO MASATO
NAGAYAMA TAKASHI
Yoshiaki Inomata
Hiroko Inomata
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