Environmental Engineering Reference
In-Depth Information
In the concept of the hub generator, the casing of the direct
driven permanent magnet generator is functioning as the hub itself.
Therefore it could also be called double direct drive (DDD), as it
cannot be more direct.
A robust 6 MW ofshore design by Alstom, which was erected
in 2012 as a prototype, is using a diferent bearing concept with the
rotor hub and the generator runner mounted on separate bearings
(Fig. 19.13). In order to prevent elastic deformation of the shaft
that is transferred to the air gap of the generator, clutch elements
are mounted in between (pure torque concept).
Figure 19.13
Alstom concept (Image: author).
19.5 
Direct Drive Pioneers
The DD concept was already proposed by Hermann Honnef in
1930-1940. He was planning huge wind power plants with DD and
three to five gigantic counter-rotating double rotors mounted on
steel lattice towers (Fig. 19.14).
The power plant was supposed to be 500 m high and the rotors,
of 160 m diameter, should produce 20 MW of electricity at a wind
Search WWH ::




Custom Search