AC electric motors use do not use permanent magnets. AC motors are usually an induction or asynchronous motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Because of this, they do not readily work in reverse like a traditional DC motor containing magnets. Replacing or modifying the rotor with the addition of Neodymium Magnets (also know as rare earth magnets) allows for electron flow through the stator wires when the rotor is turned. This produces low voltage alternating current that is not directly usable. Connecting the hot and neutral wire from the modified AC motor to a bridge rectifier changes the output to DC which can be regulated and stored in DC batteries. This requires a bit of skill and once modified, the motor should be clearly marked "Not for AC usage" to prevent a possible short.
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Ceiling fan motors have a different internal arrangement with the stator windings and require a different approach.
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