Charger Fan
How can I make a Battery Charger using a small computer fan spinning backwards? A coin battery with wind.?
I am trying to use the wind to charge a small battery for an LED flashlight.
its pretty difficult
the computer fan motor is not like an ordinary motor
its a kind of stepper motor
it has circuitry which sends electric pulses alternatively to four( or three) set of windings
so if you rotate the fan, the coils will produce some voltage but the circuitry will prevent the voltage from coming out through the leads
but you can draw current directly from the windings
but for this you will have to break it apart
and you must use some rectification circuit to convert the AC voltage from the windings to DC voltage to charge the batteries
moreover the fan is not designed to work as a wind mill (its blade area is quite less)
better get a fan blade and attach it to a small dc motor ( you may need a small gear box)
Hitler the Chargers fan
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