Why use the gear box? Why we can not directly drive shaft wind generator?
If we use the common generators and use two, four or six electrodes directly connected to the three-phase 50 Hz AC power line, we will have to use speed to 1000-3000 rpm in the wind turbine. The 43 m rotor diameter wind turbine, which means the end of the rotor faster than twice the speed of sound is even higher. Another possibility is to build a alternator with a number of electrodes. But if you want to generator directly connected to the power line, you need to use electrodes of the wind  generator 200 to obtain the speed of 30 revolutions per minute. Another problem is that the quality of rotor is proportional to the size and torque required. Therefore, direct driven generators will be very important. Use gear box, you can lower small wind turbine rotor speed, high torque, converted for use in generating the high speed, low torque. Wind turbine on the gear box, usually between the rotor and wind power  generator speed single gear ratio. For the 600kW or 750kW machine, gear ratio of about 1 to 50.

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