Function
The pitch system uses geared electric motors to adjust pitch angle of the blades.
Who supplies them
MOOG and SSB Wind Systems.
Key facts
Electric actuation normally uses high-speed DC electric motors controlled by 4-quadrant drives.
These motors drive Blade bearings [T2.5] via speed-reducing gearboxes and pinions meshing with either internal or external gear teeth on the blade bearing.
Back-up energy to facilitate safety shutdown in the event of no grid power is provided by batteries used to drive the AC motors.
Blade pitch angle is measured through absolute encoders mounted on the pitch drive motors.
All electric pitch items are mounted in panels or directly on the hub casting.
The electric pitch system for a 15 MW turbine has total mass of about 10 t.
What’s in it
- Motors
- Gearboxes
- Electrical panels
- Batteries
- Battery chargers
- Position sensors