Page 396 - Wind Energy Handbook

370 CONCEPTUAL DESIGN OF HORIZONTAL-AXIS TURBINES

Figure 6.19 Turbine Assembly in the Air (2). (View of low-speed shaft and front bearing after
installation on 1.5 MW NEG Micon turbine). (Reproduced by permission of NEG Micon)

the high-speed shaft via a bevel gear. An alternative solution to the problem of
heavy twisting cables, however, is to leave the generator in the nacelle and to
transform to a higher voltage there as well.

6.12 Drive-train Compliance

The rotational dynamics of the drive train can have a major effect on loading. The
effect is very different in fixed- and variable-speed turbines, but in each case the
consequence of ignoring drive-train dynamics at the design stage can be very
severe.