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The type of electric motor commonly used in ceiling fans does not make a good electrical generator. It is what is known as an AC (Alternating Current) Shaded-Pole Motor, a type of induction motor. An induction motor resembles a rotating transformer, because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. There are no brushes, and no direct electrical connection to the rotor windings.

More specifically, these motors are often referred to as "squirrel cage" motors. Squirrel-cage motors have a relatively heavy winding made up of solid bars, usually aluminum or copper, joined at the ends of the rotor. Currents induced into this winding provide the rotor magnetic field. The alternating electromagnetic fields created by the current flowing in the stator windings induce the current into the rotor windings. It is the interaction between the rotor and stator fields that cause the motor to turn.

Since power for the rotor is a result of the power fed to the stator, and there is no actual physical electrical connection between the two components, if no current is present when the motor is at rest, none will be produced if it is mechanically driven in an attempt to use it as a generator.

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Q: Is the reverse effect of converting rotation to electrical energy is possible when the power is turned off in the ceiling fan?
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The neatest way of doing it is to take the wire across the attic side of the ceiling. If there is a floor above, then there is a bit of carpentry involved. Determine which way the ceiling joists run and open a hole between them and fish the wire to the new location where it is needed. There is also in the market place a product called Wiremold. It is a surface conduit system.See Sources and related links below;


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