There is a Vestas V15 at my school now to look at and work on. We are enjoying opportunities to discuss how it works, and look at a real-life example. On this trip to see it we were discussing how to possibly build an adjustable bracket for the Generator to sit on so that its alignment could be checked and adjusted easily.

This is the hub and the forward shaft. This assembly is sometimes simply called the Rotor.

The gearbox (yellow part) increases the rotor's initial slow shaft speed to 1800 RPM's required by the generator to make A/C power.

This is the high-speed shaft and generator. The second smaller generator is used at off-peak times when the rotor speed is not enough to operate the main generator.