The
F.L. Smidth Turbines
During World War II the Danish engineering company F.L. Smidth
(now a cement machinery maker) built a number of two- and three-bladed wind
turbines.
Yes, Danish wind turbine manufacturers have actually made two-bladed
wind turbines, although the so-called "Danish concept" is a three
bladed machine.
All of these machines (like their predecessors) generated DC (direct
current).
(43 K, JPEG)
(Photograph © F.L.Smidth & Co. A/S) |
This
three-bladed F.L. Smidth machine from the island of Bogø, built in
1942, looks more like a "Danish" machine. It was part of a wind-diesel
system which ran the electricity supply on the island. (22K, JPEG)
Today, we would probably argue about how the concrete tower looks, but
this machine actually played an important role in the 1950s wind energy
study programme in Denmark.
In 1951 the DC generator was replaced with a 35 kW asynchronous AC (alternating
current) generator, thus becoming the second wind turbine to generate AC.
(Photograph © F.L.Smidth & Co. A/S) |