Wind Turbine Blade Balancing

The most used wind turbine nowadays has 3 blades. As the blades work in rotational motion, they cannot have different weights, so that there is no imbalance between the mechanical loads applied to the turbine.

The unbalance can cause vibration in the turbine, in addition to repetitive efforts that
cause fatigue in the turbine and reduce its useful life. So how is it done?

After the finishing step, the blades are weighed. From this analysis, groups of three blades of the same weight are formed. To adjust the weight of the blade, a high-density material is injected into the blade (there is a special space for this, called a balance box).

In the past, lead was used in the balance box, then iron, sand and, currently, a polymeric mass
(resin) is used.

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