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If the main shaft and main bearings could be integrated into
the gearbox, everything would be much more compact and simple,
and thereby cheaper. At the gearbox manufacturer Kumera in
Finland, Preben from Nordic Folkecenter found an integrated
gear-box meant for an industrial mixer. By turning it 90 degrees,
replacing the electrical engine with a generator, and replacing
the mixer with the WTG rotor, the concept for a simple WTG
machinery was in place. The integrated gearbox system became
the foundation of the Vind-Syssel technique, together with the
hydraulic wing brakes in the tip. Everything else in the Vind-Syssel
WTG was more or less ordinary.
Figure 11.6
A Vind-Syssel 50 kW wind turbine (Photo: Arne Jaeger).
While working on the 50 kW documentation, I told Karstensen,
one of the Folkecenter engineers, that I did not like the extreme
loads on the disc brakes in emergency cases, and that I also did
not like the idea of having extra doors in the tower for manually
resetting the wing brakes after use. I claimed that the wing brakes
should be hydraulic, and be not only for emergency use, but also
for relieving the load on the disc brakes. However, people responded
with a word which I never understood: “impossible”. How would
you get the hydraulic pressure from the nacelle into the rotor?
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