sin αst

Figure 6.16: Balancing of the assembled rotor
This project does not go into details regarding the imbalance limit states, e.g. determining
when a blade is considered in balance and when it is not. Some guidance for determining
these may be found in the load cases of appendix A.3, which states several loads of rotor
eccentricity. Practical rotor balancing is described in [20], which makes suggestions of
adding small weights on the rotor as a mean of balancing ii with regard to its centre of
rotation.
6.2.4 Blade attachment
The blades are mounted directly on the front disc of the generator, which therefore also
works as a hub. Each blade is mounted using 3 pcs. M12x60 bolts and a large washer,
which distributes the contact forces of the bolts, is used to secure the entire rotor in place,
as shown on figure 6.17.
ROTOR
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