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Product Information

Technological expertise on the inside

When it comes to choosing the right drive train technology for a wind power plant, high yield is only one aspect that has to be considered. Reliability and costs – which include transportation and logistics as well as service after the turbine is installed – play an equally important role. Siemens offers two different turbine types for different application: geared and direct drive wind turbines.

Geared wind turbines: tried-and-tested evergreens

The first wind turbine installed by Siemens was a geared one. So clearly, with an over 30-year track record of reliable operation, our geared turbines are proven technology that stand for high availability, low investment risk, and a long lifetime.


Their drive train marks the result of a long evolution. The gearboxes convert the massive torque of the main shaft into rotation speed. The fully enclosed asynchronous generator features a squirrel-cage rotor without slip rings, which helps to extract the maximum energy yield. This proven combination of gearbox and generator is an evolutionary design for high-energy yield – even at less than full loads – because the generator rotor construction and the stator winding are specifically designed for high efficiency at partial loads.


Drawing on our extensive experience, we have improved the efficiency and resilience of all components over the years. For maximum protection of the internals, a square steel canopy encloses the nacelle. Furthermore, to lower service costs and reduce work time, the nacelles are specifically designed to make the moving parts easier to access.

Take a look at the technical highlights of a geared wind turbine

After more than thirty years of reliable operation, our geared turbines are proven technology. All components have been improved and optimized over the decades to ensure high availability, low investment risk, and a long lifetime.

    drag to rotate



    Weather Station



    Rotor hub

    Main shaft

    Yaw ring


    Yaw drives

    0-year track record

    High efficiency at partial loads

    Low maintenance costs and reduced work time

    Direct drive turbines: performance and profitability go hand in hand

    In wind turbine design, it’s crucial to take a holistic view that incorporates the design and construction, materials, processes, manufacturing, and installation. Since the first prototypes were installed in 2009, our gearless direct drive solutions have carefully balanced all these factors in a compact system. Service personnel are directly involved in the development process, to ensure optimal working conditions and serviceability.


    Notwithstanding the reliable track record of gearboxes over the years, they remain the most complex components in wind turbines. It follows that eliminating the gearbox reduces complexity and can further increase reliability. Replacing the gearbox, the coupling, and the high-speed generator with a low-speed generator eliminates two-thirds of the conventional drive-train arrangement. As a result, the number of rotating and wear-prone parts is greatly reduced compared to a geared machine, and therefore maintenance is a lot easier.


    For optimum efficiency, we chose a permanent magnet generator. The main advantage of permanent magnet generators is their simple and robust design that requires no excitation power, slip rings, or excitation control systems. This leads to high efficiency even at low loads. The generator is positioned between the tower and the hub, producing a comfortably lean arrangement of the internals in the nacelle. This leaner nacelle, the removal of the gearbox, and other design simplifications result in lighter weight and smaller dimensions – which means lower costs for transportation and installation.


    The latest generation of these turbines are part of the OptimaFlex product offering. OptimaFlex represents an entirely fresh approach to wind power. Wind turbines can be precisely configured to turn deep insights about your business and site conditions into lower LCoE. This results in wind power solutions that are right for you on day one and every single day thereafter.


    Take a look at the technical highlights of a direct drive wind turbine

    With a low-speed permanent magnet generator that eliminates two-thirds of the conventional drive-train arrangement and removes the need for a gearbox, our direct drive turbines are simpler, lighter, and easier to maintain.

      drag to rotate

      Cooling exhaust

      Yaw system

      Cooling inlet with filter


      Meteorological sensors


      Swing arm

      Blade bearing cover



      Control panel

      High efficiency at low loads

      Compact and lightweight construction

      Low costs for transportation
      and installation

      Our technologies in action


      Get in touch with the future

      If you are interested in technological innovations and trends, take a look at our magazine, Pictures of the Future.
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