http://www.outdoorlanternsonsale.com/led-dynamo/
Is it possible to use a DC motor as a dynamo to light a 6V tungsten bulb or a 3V LED?
Hi,as part of a small experiment,I tried generating electricity from a DC motor (Tape Recorder motor-12V DC 2000-3000 rpm) with a 6V DC tungsten bulb as load.I fixed a toy helicopter's fan on the motor's rotor and held it under a ceiling fan.The motor's rotor did rotate well but the bulb didn't glow.I tried the same with 3V LEDs and the result was the same.What current do I generate by this method-AC or DC?Will this procedure yield any result or should I use a rectifier in between and try the same?Any other suggestions are also welcome.
I rotated the motor using a 9V battery and found that when a particular terminal of the motor,say A,was connected to the +ve of the battery the motor rotated in anticlockwise direction.So if I give an anticlockwise rotation to the motor where will the positive terminal of my generated DC be?(to know how I should connect my LED)Or if an AC is generated how should I connect the LED?
You will be hard pressed to get an LED to light up from a DC motor. An LED requires a very precise range of voltages to produce light at all, below a certain voltage, and it will not generate any light at all, and above a certain voltage, you will destroy the LED.
As for ascertaining the polarity of the motor, simply attach a volt meter to it. Spin the shaft in one direction, and see if the voltage is positive or negative. If the voltage is positive, then the positive side of the LED should go to the side of the motor that is touching the red probe of your multimeter, otherwise, it should go to the black side.
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