HEAT TRANSFER ENHANCEMENT OF VENTILATION CHIMNEYS FOR DYNAMOELECTRIC MACHINE ROTORS

PURPOSE: A heat transfer enhancement of ventilation chimneys for dynamoelectric machine rotors are provided to obtain a chimney with an improved a heat transfer performance by agitating the surface of ventilation chimney. CONSTITUTION: In a heat transfer enhancement of ventilation chimneys for dynamoelectric machine rotors, a rotor(100) is included at the end ranges(172,174) of a dynamoelectric instrument. A plurality of radial direction slots prepares on the rotor, and a plurality of coils(130) respectively are locates at a plurality of radial direction slots. A plurality of coils comprises turn laminated to a plurality of radial directions. The ventilation chimney(150) is formed on a part or whole of turn in the radial direction, and more than one chimney slots are expanded in the radial direction.