planetary gear wind turbine / variable-speed

Hyosungs HS90 2MW wind turbine is a three bladed, pitch regulated upwind wind turbine with active yaw system. The rotor has three-bladed pitch bearings with full span control. The rotor has a variable pitch system. It helps the blade to be operated in optimized angles at all times to maximize the power production.
Rotor
The rotor of HS90 consists of a hub made of cast iron, three blades and the pitch regulation system. The blade bearings connect hub and each blade.
Blades
The blades are 43.8 meter long and are equipped with a lightning receptor at the tip. The steel cable inside the lightning receptor protects the blade and the hub from lightning. The distance between the root of the blade and the center of the hub is 1.5 meter and, as a result, the diameter of the rotor is 90.6 meters
Gearbox
The main gear transmits torque and revolutions from the rotor to the generator. The gear unit is a combination of 2-stage planetary gear and 1-stage helical gear. The main shaft that is connected from the rotor is mounted into an input shaft of the gearbox with shrink disc. Two torque arms support the gearbox, and the hydraulic dampers that is positioned between the torque arm and main frame absorbs the torque and the oscillations. Finally torque is transmitted from the high speed shaft to the generator via a flexible composite coupling that is located between the high speed shaft and generator and behind the brake disc. The brake disc is mounted directly on the high-speed shaft. The gearbox lubrication system is a forced feed system with integrated oil pump.