The direct drive technology will be the future technology. No turbine technology is as reliable and long living as direct drive turbines. This thesis is confirmed by the current market situation in Germany. Further until now, most direct drive turbines are using an air cooling system either using ambient air or an internal air circulation system. This cooling method needs a high temperature difference between cooling medium and generator winding system to generate the needed heat flow. So the winding system is warmed up to 120 deg C and more and not very homogenous as the generator geometry mostly causes an inhomogeneous temperature allocation with some hot spots. The presentation deals with a new turbine design based on an active cooling system using carbon dioxide which absorbs the generator heat losses by evaporation. This cooling method opens new design possibilities as no air is led to the winding system and allows for a fully sealed generator which is ideal for the coming offshore application. At the same time, the generator is designed for replacing the hub and bearing the blades directly without an additional hub part. Therefore the number of parts to be lifted on site can be reduced from three to two which is also an important issue with regard to offshore turbine erection. Finally, tower head masses of direct drive turbines are compared. The result shows, these modern direct drive turbines are no longer heavier than modern gear turbines, some of them are even lighter and the new turbine design developed by the Research Group confirms this tendency.
New direct drive turbine design using advanced cooling with evaporating CO2
Design einer neuen Windturbine mit Direktantrieb unter Verwendung einer fortgeschrittenen Kühlung mit CO2-Verdampfung
2008
4 Seiten, 10 Bilder, 5 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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