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standstill the anemometer sent a signal that changed the energising
current and reduce the velocity of the rotor to a non-critical rotation
speed. Today this principle is being developed on the advanced
multi-polar ring generator wind turbines, whereas the ordinary
types with asynchronous generators just stop when the winds are
really strong, over 25 m/s or so.
The Kramsbjerg windmill is an instance that shows that even
with a great personal involvement, technical quality and a sensible
price the market will not just descend to you from above. At that time
people were so engaged in what was going on within the established
windmill trade and export adventure that the Kramsbjerg and the
like were not given adequate commercial conditions.
Figure 16.11
The Kramsbjerg windmill (Photo: Flemming Hagensen).
16.8
The Ring Generator Turns Up
It is almost possible to repeat the story just told about the
Kramsbjerg windmill when we describe the Odder windmill. It
was at 18.5 kW with three blades, downwind. It did not become a
commercial success, either, when it was launched in 1983-1984,
but not because of lack of technical qualities. The necessary legal
and planning framework was absent, and as renewable energy is
dependent on such framework, the market did not emerge.
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