New Transmission Concept for Wind Turbines: Higher Energy Yield With Torque Vectoring Gears
Wind turbines have a problem: Depending on the wind's force, the rotational speed of the turbine and thus of the generator changes. However, alternating current must be fed into the grid with precisely 50 (or 60) hertz. Typically the generated alternating current is first rectified and then transformed back to alternating current of the required frequency. Scientists have now developed an active transmission that makes this double transformation superfluous.
In their research, scientists from the Chair of Machine Elements at the TU Muenchen took a closer look at the gears and generator system. To attain the grid frequency of 50 hertz, a generator with the usual two poles pairs must operate at a synchronous speed of exactly 1500 revolutions per minute. To fulfill this requirement in spite of the variable input rotational speed, the researchers developed a novel active torque-vectoring gear analogous to a controlled differential in motor vehicles.
Lees verder: http://www.scienceda...10223122423.htm
Bron: Science Daily
New transmission concept for wind turbines: higher energy yield with torque vectoring gears
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