Siemens: a generator without transmission mechanism for wind turbines installations

The company Siemens has developed a new synchronous generator without transmission mechanism for a wind turbine installation on the Norwegian coast, which has an extremely high degree of efficiency of 98%.

The generator transforms the wind energy from the rotor into electric current using permanent magnets. Generators are important components of wind power installations.

With standard generators, which convert wind energy using a gear between the very slow rotor and the faster generator, there is a loss of energy due to friction and heating.

The generator without transmission mechanism developed by Siemens avoids these losses, and in this way the installation can operate even at low wind speeds or short gusts.

In addition, this new type of generator requires much less maintenance than traditional generators, which is an important aspect to take into account for wind turbines installed in difficult to access areas (for example on the high seas).

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The Hundhammerfjell installation (Norwegian coast) is, with a rotor diameter of 87m and a height of 80m, the largest installation in the world equipped with a synchronous generator without transmission mechanism.

It delivers three megawatts of power, which enables the Scandinavian operating company ScanWind to supply electricity to around 3000 Norwegian homes each year.

Contacts: Dr. Norbert Aschenbrenner - Siemens Technikkommunikation, tel: +49 89 636 33438, e-mail:,
Depeche IDW, Siemens Press Release, 15 / 09 / 2004. Editor: Nicolas Condette

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