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Turbine blades for small-scale wind turbines are typically 1.5 to 3.5 metres (4 ft 11 in – 11 ft 6 in) in diameter and produce 0.5-10 kW at their optimal wind speed. [1] Most small wind turbines are horizontal-axis wind turbines , [ 2 ] but vertical axis wind turbines (VAWTs) may have benefits in maintenance and placement, although they are ...
Southwest Windpower’s latest turbine, the Skystream 3.7, has a rotor diameter of about 12 feet (3.7 m) and can generate up to half an average U.S. home's energy in optimal winds. It is the first residential-scale wind generator designed specifically for the grid-connected home or small business. [citation needed]
By the 1930s, use of wind turbines in rural areas was declining as the distribution system extended to those areas. [16] A forerunner of modern horizontal-axis wind generators was in service at Yalta, USSR, in 1931. This was a 100 kW generator on a 30-meter (98 ft) tower, connected to the local 6.3 kV distribution system.
The 845-megawatt Shepherds Flat Wind Farm in Oregon is the first windpark in the United States to utilize permanent magnet design in its primary wind turbine. Fântânele-Cogealac Wind Farm in Romania, constructed in 2008, uses 240 GE 2.5xl wind turbines capable of generating a total of 600 MW, powering a million Romanian households each year. [29]
An advantage of a gearbox is that generators are typically designed to have the rotor rotating at a high speed within the stator. Direct drive wind turbines do not exhibit this feature. A disadvantage of a gearbox is reliability and failure rates. [4] An example of a wind turbine without a gearbox is the Enercon E82. [5]
Generation by kite-energy systems may involve pumping, electricity generators flown in the upper flying system (flygen), electric generators situated on the land or sea or on board a vessel (groundgen), simple lifting of objects (lifting), pulling hulls or other objects , or transportation; systems generate energy to do special tasks. Systems ...
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