Wind energy

5. Turns the low-speed shaft at about 30-60 rpm
7. Drives the generator.
9. Orients upwind turbines to keep them facing the wind when the direction changes.
10. Produces 60-cycle AC electricity; it is usually an off-the-shelf induction generator.
11. Lifts and rotates when wind is blown over them, causing the rotor to spin. Most turbines have either two or three blades.
12. Supports the structure of the turbine.
13. Stops the rotor mechanically or electrically in emergencies.

1. Turns blades out of the wind to control the rotor speed.
2. Blades and hub together form the rotor.
3. Starts up the machine at wind speeds of about 8 to 16 miles per hour (mph) and shuts off the machine at about 55 mph.
4. Powers the yaw drive.
6. Connects the low-speed shaft to the high-speed shaft
8. Measures the wind speed and transmits wind speed data to the controller.