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  1. gears of any sort do not increase power, they just change the ratio of speed to torque. So gearing up the speed will increase the speed but decrease the torque.

    But you need to match the RPM to the most efficient RPM of the generator/motor, so in that sense, you do increase power in the sense that you waste less power.

    To pick the gear ratio, you need to know most efficient RPM of the generator/motor, and the RPM of the wind turbine at your design speed, and use gears to match the two RPMs.

    .

  2. Well, your idea is good, but the practical side may not allow you to gear up.
    The problem you would probably have is the losses in the gearbox, if you are using a small DC motor.
    To compensate for the losses, you would need to increase the size of the blades, and quite markedly. The torque needs to increase, especially as output and load increase.

Epicyclic/planetary gears with wind turbine?

I have a motor and am using it to generate power with a small home built wind turbine — can I use planetary gears to increase the power and is there a limit to what gear ratio I can use?
Sorry – better explained, I want to increase the revs/min of the motor for a given angular speed of the blades, compared to having a 1:1 ratio without a gearbox. I know torque will decrease but I’m more interested in getting the motor turning, so greater speed.

Hope this makes more sense, and thank you for the help!