Development of passive-controlled HUB (teetered brake & damper mechanism) of horizontal axis wind turbine
- Mie Univ. (Japan)
For the purpose of the improvement of reliability of the Mega-Watt wind turbine, this paper indicates the development of an original mechanism for the passive-controlled hub, which has the effects of braking and damping on aerodynamic forces. This mechanism is useful for variable speed control of the large wind turbine. The passive-controlled hub is the combination of two mechanisms. One is the passive-teetered and damping mechanism, and the other is the passive-variable-pitch mechanism. These mechanism are carried out by the combination of the teetering and feathering motions. When the wind speed exceeds the rated wind speed, the blade is passively teetered in a downwind direction and, simultaneously, a feathering mechanism, which is linked to the teetering mechanism through a connecting rods, is activated. Testing of the model horizontal axis wind turbine in a wind tunnel showed that the passive-controlled hub mechanism can suppress the over-rotational speed of the rotor. By the application of the passive-controlled hub mechanism, the maximum rotor speed is reduced to about 60%.
- Research Organization:
- American Wind Energy Association, Washington, DC (United States)
- OSTI ID:
- 570080
- Report Number(s):
- CONF-970608--PROC.; ON: DE98001975
- Country of Publication:
- United States
- Language:
- English
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