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Building a POV, Propeller Clock motor

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Step 2: Working principle

The idea is to use one of the motors to make the pov circuit spin around and the parts of the other motor to work as a generator for electricity.

The driving motor part is basically untouched. The speed of a floppy disc drive is to slow. Therefore the motor driver need to be modified to make the motor turn faster.

Parts of the other motor can be used to build a generator. Using a dc brushless motor we get three phase current, see http://en.wikipedia.org/wiki/Three-phase_electric_power . The three phases are rectified with three diodes and the resulting voltage can be used to power the pov circuit.

The coils of the generator need to spin with the pov pcb. Therefore the magnets need to be mounted onto the static pcb of the motor and the star with the coils onto the spindle of the motor.
 
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cmonaco34 years ago
Hey, I know this may be a stupid question, but what are you grounding to here?
frickelkram (author)  cmonaco34 years ago
Ahhhhh, philosophic question ;-)
There is no ground in free air ... is it?

I use the sign that you see on the picture as a common signal. If I would have drawn a real ground, in terms of an "earth" connection, I would have used this symbol;
http://de.wikipedia.org/w/index.php?title=Datei:Symbol_Ground_%28common,_horizontal%29.svg&filetimestamp=20060626175918

Does a Wikipedia page for this, exist for the US also?
http://de.wikipedia.org/wiki/Liste_der_Schaltzeichen_%28Elektrik/Elektronik%29

Ok, so let me get this straight, in the physical system there is no "ground" ? I'm just wondering what the actual wire connects to. After powering the LED, the negative end goes where?
it connects just before the capacitor (ie to the common end of the coils)