
A permanent magnet wind turbine uses the rotational movement of turbine blades to produce electricity through the use of a magnetic field. These motors are typically designed to be direct current, which has some advantages of alternating current designs. DC power can be easily stored for later use, and they are also generally less expensive than AC motors.
Most DC motors can be turned into a permanent magnet wind turbine. A DC motor works by using electricity to power magnets which then turn the shaft of the motor. By using wind to turn the shaft in reverse, the shaft pushes the rotors through the magnetic field created by the magnets, and the result is the production of electricity.
Because of their simplicity, building your own permanent magnet wind turbine is not a hard thing to accomplish. The first trick is to find an appropriate DC motor. These can be found through most hardware stores, or if you're in a budget pinch, they can also be taken out of existing items such as treadmills.