How to Build a Bedini Motor ... Part 2

I also tried this and failed. Is it the coil? Is it the transistors? I have replaced parts and still no automatic spin. Any pointers as what to try next. I tried doing a School Girl Design and I have tried all the transistors suggested would work. So far, I am suspecting that the pot is the problem, which is the only part I have not replaced. I am using a 1 ohm pot.

How do you test the pot to see if it's working?

The motor doesn't self start... have you tried giving the rotor a spin by hand to see if it gets going.

and a 1 ohm pot is far too small... you really need a 1k pot. the pot might be fried and the only way to test it really is with a multimeter.

if anyone here has build a motor like this one can anyone tell me if is important the number of turns on coil and other parameters? I also try to build one my self.

Well presented, idiotproof. That means even I will give it a try. Thanks!

Good video - I built this, but found that I was only getting a few millivolts from the trigger coil. Not really enough to fire the switching function.

I might give it another go with stronger magnets and see if I can get enough voltage to switch.

A few millivolts is all you need. Once the voltage induced by the trigger winding *slightly* activates the transistor, then the coil acts as a transformer and really activates the transistor. Is your motor running at all?

No it's not spinning at the moment - I've double checked the connections and they are all correct.

My winding got a bit sloppy towards the end, maybe this is harming the trigger voltage.

Is the problem I am having due to the fact that I am using neodynium magnets? What are the weaker magnets that you talk about called?

Hi! Nice video.
But your wire that goes out from potentiometer is in the center pin and not both are on outside. If you wire them up like this, then your potentiometer works as a resistor of constant 1kOhm.