Bulb turbine-generator unit

摘要

Conventional bulb turbine-generator units usually provide an external cooling system, e.g. an internal air circulation system combined with an external heat exchanger to dissipate the heat generated by electrical losses in the generator and excitation windings. These cooling systems, however, are costly. The present invention describes now a bulb turbine-generator unit (1) which avoids the above disadvantages by using a synchronous generator (3) with a permanent magnetic excitation having permanent magnetic poles (13) which are arranged on the rotor (12) of the generator and by cooling the generator (3) only by the flow of the turbine driving media by the heat transfer from the exterior surface of the bulb (4) to the media. <IMAGE>