Siemens produces first 75-metre blades

DENMARK: Siemens has produced the first batch of 75-metre blades, the world's largest, to be used on a prototype at the Osterild plant in Denmark.

The blade is for Siemens upcoming 6MW turbine. Although the first prototype was built last year, the company announced in November that it was building a version with a 150-metre rotor.

Previously, the world's largest blade was produced by LM for Alstom's 6MW Haliade offshore turbine.

The 6MW direct-drive turbine was first launched in June 2011 with a 120-metre rotor. It will replace the company's popular 3.6MW offshore machine.

Siemens claims the 6MW turbine has only half as many moving parts as a geared turbine of the same class. Additionally all of the electrical components are stored in the nacelle.

Speaking to Windpower Monthly in June, Siemens chief technology officer Henrik Stiesdal said the turbine design was influenced by the SWT 3.0 101 design.

He said: "The prototype rotor blade and rotor hub are similar to those of an SWT-3.6-120. The water-cooled permanent magnet generator is based upon the same design principles but is longer, has more poles, and the outer diameter is 6.5m."

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