Troubleshooting

[kmh]

[sucahyo]

What is the impedance of your coil?

I read that people usually need 500mA at 12 V. This may translate to coil impedance between 12 to 1 ohm.

[kmh]

Not sure what you are asking honestly. Are you suggesting I should try a larger power source?


I went ahead and put it all together trying the 30 gauge as the trigger and got no results at all. I am attaching pictures of my thrown together setup to see if anyone might be able to point out what is wrong here.

Transistor is 3055, Diode is 4001, and Resistor is 100ohm
Power wire is 18 gauge and Trigger is 30 gauge.

[kmh]

[jonnydavro]

@Kmh.HiThanks for taking an interest in my Bedini experiments and once you get get your first working motor,there will be no stopping you .
Ok, a few things to try.First put an amp meter in series with the positive of your battery.This is needed in the debug stage to see if the transistor is triggering.
In the pics you posted,your variable resistor looks wired wrong as you are using the outside connections.The centre connection is the wiper arm so needs to be used with one outer connection.You have it wired across the full resistance.
Your coil should work as Lidmotor has shown that you don't need much wire to make a bedini,he used a sewing bobbin and i have just replicated this this week and found that it was hard to start with a sphere but easy with the cylinder with the steel ball bearing pivot so what i am saying is you may not be spinning the sphere fast enough,close enough for long enough.
I would spin the sphere on top of the coil and use aircore for now and you can experiment with cores later.
Try my suggestions and see if you can get a reading on the ampmeter when you spin the magnet and you could also replace the pot with a large one over 10k and see if the circuit goes into self oscillation.You may need to spin the magnet in front of the coil to start it.Let us know how you go.Jonny.
p.s Plenty of good info here http://www.energeticforum.com/renewa...ead.php?t=4026

[kmh]

Thank you very much for the advice. I will move the trigger wire over to the center connection on the pot and check the amp readings tomorrow and post my results. Thanks again for the help.

[kmh]

[citfta]

nicked wire

If you nicked a wire you would have had to nick both wires at the same place for there to be a connection from the trigger wire to the power wire. Did your buddy check the wiring with the coil still connected to the circuit? If he did then he is reading back through the circuit and not the wiring in the coil. If you do find a nick in the enamel of one of the wires you can always just put a coat of finger nail polish on the nick and let it dry then rewind the coil.

I just reread your post and realized you said you didn't show any current when you did the inline amp test. This indicates you do NOT have a short in the coils. Looking at your pictures it is not clear if you have the enamel completely cleaned off the ends of the trigger wires. The power wires look pretty good. You have got to get all the enamel off the wires before you solder them. Otherwise you will have a bad connection inside the solder joint. Your soldering actually looks very good. If you are sure you have good connections every where then the next thing to do would be to swap the ends of the trigger winding and see if it takes off then.

Good luck, Carroll

[kmh]

Yes I disconnected the coil completely from the circuit when he tested it just because of that fact. The only thing I can think of is I must have hit the edge of the spool when I was winding and took some of the enamel off. If you look in the pictures you can see I cut it so it would lay more evenly, I should have sanded the edges smooth. Lesson learned.

I to found it odd that there was no reading at all myself but, as stated in the beginning of this post I am fairly new to electronic circuits and etc so I was going off my buddies advice who sometimes has to fix wiring in cars (I work in a automotive shop). I double checked all the connections and the enamel is cleaned completely off about a half an inch back.

And thanks for the comment on the soldering I learned how to do it about 5 minutes prior to putting this together on YouTube lol.

Thanks

[kmh]

[jonnydavro]

Hi kmh.Can you just check the value of your pot as it says 1m in the pic and that is 1 mega ohm,you want a 1k ohm pot.
I think your problem may be you are not inducing enough voltage in your coil.This can because your coil has not enough windings or you are not spinning the magnet fast enough and close enough to induce the voltage to trigger the transistor.I can't emphasise enough how important a good spin is.If still no luck,reverse your trigger coil connections and repeat your tests.
You need to have your amp meter set on mA and it won't read anything until you spin the magnet or fixed rotor in front of the coil.
If you still can't get your circuit to work,have a look at this video by the daftman.He makes it very easy to get a runner.Let us know if you have any luck.Jonny.
YouTube - Bedini pulse motor, build and diagram video 1 of 3.(TheDaftman)

[kmh]

Would a 5k pot work in its place? It is the closes I can find at the local RadioShack. All they had in this style pot was 5k, 10k, 100k, and 1m. While I understand the general purpose of the pot, I do not fully grasp at the impact it has on the overall effectiveness of the motor.

[rave154]

a 5k pot will work ok.but will need to have it turned down low...also.need to have at least maybe a 100 Ohm resistor in series with the pot..so that if you turn the pot down to minimum...you still have 100 Ohm's as a base resistance...sort of safety guard