Which two components drive the pinion gear to rotate the nacelle yaw bearing?

• A. Yaw Motor and Yaw Drive
• B. Wind vane and Anemometer
• C. Pitch motor and Main motor
• D. Generator and Controller

Answer: (D)

The nacelle yaw system turns the whole nacelle to face the wind, and the pinion gear is driven by the yaw drive assembly. The yaw motor supplies the rotational power, and the yaw drive (a gearbox) translates that power into the right speed and torque to rotate the pinion and thus rotate the nacelle on its yaw bearing.

Wind vane and anemometer are sensors that detect wind direction and speed; they don’t move the nacelle. The pitch motor adjusts blade pitch, not yaw. The generator and controller handle electrical generation and overall control, not the physical rotation of the nacelle.