Environmental Engineering Reference
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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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