| abstract |
PURPOSE:To uniformize core temperature by constructing the central portion of a stator core, a suction zone, with silicon steel plates, and constructing the end portions of the stator core, exhaust zones, with amorphous metal plates having less iron loss. CONSTITUTION:Cooling air from a cooling fan 7 passes through a ventilating tube 8, through a gap in the outer periphery of a stator core 11 which is a suction zone and an air duct 9 provided in the central portions toward the internal diameter direction, through an air gap 3 and an air ducts 10 at the end portions which are the exhaust zones toward the outer diameter direction, and it is exhausted from the outer periphery of the stator core 11. The central portion 11a of the stator core 11, the suction zone, is constructed with silicon steel plates, and the end portions 11b of the stator core 11, the exhaust zones, is constructed with amorphous metal plates having less iron loss. With this, temperature increase lowers in the stator core end portions which are the exhaust zones and have a higher temperature, whereby the stator core temperature can be uniformized. |