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http://www.powergenworldwide.com/index/display/...lay/1438039132.htmlDirect drive
Nordex has chosen the direct drive route, for maximum reliability. The company therefore takes the opposite view to that of Vestas, which has opted for a geared drive for the same reason. The Nordex view is that failures in a direct-drive system's electrical components may happen more often but that repairing heavyweight mechanical components causes more lost days overall, especially in the case of a gearbox breakdown which most often involves bringing out a jack-up vessel.
'Our point of view is that with the direct-drive you have mechanically fewer components, which means fewer components to fail,' says Thomas Karst, chief executive of the newly-formed Nordex Offshore GmbH. 'If you look at the statistics, the gearbox still represents a large proportion of the problems that arise.'
'Out at sea in particular, we must do everything we can to optimise the technical reliability of the turbine. With cost structures differing to those in the onshore market, we are able to implement a more complex drive system, namely a direct drive,' says Thomas Richterich. To partner the direct drive train Nordex has opted for a permanent magnet generator coupled with a full power converter, the whole designed to harness wind speeds of around 10 m/s, and substantially lighter than formerly used. Nordex is engineering this drive design in conjunction with experienced suppliers and is therefore placing its reliance in proven technology.
Nordex has not yet settled on any maker for the PMG for the new machine, but says it is currently working with various suppliers to deliver the entire generator-converter system as it further develops the turbine design. Only system suppliers able to deliver the entire generator/converter system and who are already market leaders in this area, says Nordex, are being considered.