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Figure 3-9. Final assembly of the
100-kW Mod-0 HAWT test bed in
1975. It was located at the NASA-
Lewis Plum Brook Test Station near
Sandusky, Ohio. ( Courtesy of NASA
Lewis Research Center )
up gearbox was increased to the
1,800-rpm speed of the 100-kW syn-
chronous generator . At winds above
rated, power was held constant at 100
kW by full-blade pitch under compu-
ter control, with the blades positioned
by hydraulic actuators mounted on
the rigid hub . Wind direction was
sensed by a wind vane on top of the
nacelle and monitored by the auto-
matic yaw control system. When a
change in the nacelle azimuth was
needed, a pair of electric motors
operated through a worm-gear reduc-
tion drive and a pinion gear to drive
a bull gear attached to the bedplate .
Yawing speed was 1/6 rpm.
Figure 3-10. Power train and yaw drive equipment in the Mod-0 nacelle. The pulleys
and belts at the generator permitted changes in rotor speed, to study tip-speed effects and
avoid structural resonances. ( Courtesy of NASA Lewis Research Center )
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