I looked at the some old PC Fans I have and thought that they can be used as Small Wind Turbines.
The concept is simple. You can skip this part and start directly with the conversion.
The BLDC motor used here has a stator winding and a Permanent Magnet Rotor. The motor is supplied by 12V DC. But the magnetic field rotation is generated by electronics ( Electronic Commutator ) . As the name implies , the electronics components convert DC into AC which makes the magnetic filed in the stator rotate.
The electronic commutation is achieved by a small IC.
To get the induced current from the motor used a generator , you must remove this IC .
This is what I 'll show you how.
All what you'll need is this tool
First remove sticker on the back of the fan.
Then you 'll find a small piece of plastic lock that holds Fan shaft secured , Don't brake it. Remove it with a crocodile clip .
You can see 4 poles of winding connected in series and have only 2 terminals. To get the induced current , connect supply wires to those terminals and let the fan rotate.
Remove this IC.
Assemble the fan in its place and lock it with the piece of plastic I told you about.
Put back the sticker.
Connect LED terminals to the Supply wires. Don't worry about +ve and -ve terminals , the LED will light if you connect it any way , trust me.
Roll the Fan
This video shows the fan in action.
Here is the project on instructables.com
You can read this article in Arabic
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