The yawing mechanism also finds its place in the nacelle. This system consists of powerful electrical servo motors which are controlled by a proportional wind direction sensor. In order to keep the blades in the wind, the nacelle can be yawed around its vertical axis. Furthermore, a twist sensor registers the position of the nacelle.
The yaw bearing is an internally geared ring with a pre-stressed four point contact ball bearing. Electric planetary gear motors drive the yawing. The yaw brake is passive and is based on the friction of brake pads directly on the bearing ring, keeping the yaw system rigid under most loading conditions. In case of highly eccentric peak loads, the yaw brake will slide and the yaw motors will follow the motion passively, thereby unloading the system.