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[lost66]

i dont have a COP2 yet, but working on it
i still think i should wind another trigger and use this winding in some other configuration

-it seams such a wast 2 have a whole winding of that size, just 2 trigger (if i could tap off the extra power from it, it might b ok?)

-i am thinking of joining the 2 windings on both sides and run them in parallel a1+b1 start and a2+b2 end?

-or a1 start, join a2 & b1 and have b2 as the end (then it will be in series, and go around the rotor twice)?

-or join both windings in series on each pole to make 1 winding per pole (a bit more work, but can be done)?

-or double up on the circuit, using the 2 windings with 2 circuits in parallel?

after i have done one of the above, then i must add a thinner trigger winding?
or glue a small pc fan on top and use that for triggering?

i really like the light bulb in the circuit thanx, the only 1 i could find was a 3watt so i used it. i will go get a smaller 1 if it will b better. BUT i fried another pot!
the winding must b 2 strong 2 b a trigger! and should be better used as a drive/charge winding

please have a look @ the option above and help me decide on the next steps 2 take

[blackchisel97]

From your description it seems like trigger coil has low impedance and it will draw more current than your pot can handle. From the tag on your fan looks like was wired to draw 5W - if I can read it well. Your option would be hd pot (couple watts) at leat until you tune it. After you can measure your pot and replace with resistor. Again, your resistor has to be 5W wirewound, not small 1/2 or 1/4W carbon. Those will go up in smoke, just like your pots. Another option would be to rewind trigger coil with more turns of thinner wire. This will reduce your input current and still be sufficient to trigger your transistor.


Vtech

[lost66]

From your description it seems like trigger coil has low impedance and it will draw more current than your pot can handle. From the tag on your fan looks like was wired to draw 5W - if I can read it well. Your option would be hd pot (couple watts) at leat until you tune it. After you can measure your pot and replace with resistor. Again, your resistor has to be 5W wirewound, not small 1/2 or 1/4W carbon. Those will go up in smoke, just like your pots. Another option would be to rewind trigger coil with more turns of thinner wire. This will reduce your input current and still be sufficient to trigger your transistor.


Vtech

just had a look on the tag, it i more in the line of 14w or 16w
i do like the idea of wind a trigger coil with thinner wire. then i can use the original to increase the COP.

[Sephiroth]

Blackchisel97 has offered good advice

If your pot is burning out then it would help if you add another resistor (or bulb, or relay coil) in series with the pot. I would recommend just a resistor to begin with.

Find out what value (in ohms) the pot is set at when it is operating well... let's say for example it is 150 ohms. Choose a resistor that has a lower value... perhaps half.

You don't want to tap power from the trigger winding... it will just mess up the triggering and you won't gain that much from it anyway since the charging battery is a much lower impedance than your trigger circuit.

It may be worth while rewinding your coils with a much finer gauge for the trigger winding... this will let you have more turns on your primary winding AND trigger winding, and make the turns closer together, increasing the coil's inductance. Make sure you wind them the same way as the original windings

What's your current draw when the fan is operating normally?

[lost66]

Blackchisel97 has offered good advice

If your pot is burning out then it would help if you add another resistor (or bulb, or relay coil) in series with the pot. I would recommend just a resistor to begin with.

Find out what value (in ohms) the pot is set at when it is operating well... let's say for example it is 150 ohms. Choose a resistor that has a lower value... perhaps half.

You don't want to tap power from the trigger winding... it will just mess up the triggering and you won't gain that much from it anyway since the charging battery is a much lower impedance than your trigger circuit.

It may be worth while rewinding your coils with a much finer gauge for the trigger winding... this will let you have more turns on your primary winding AND trigger winding, and make the turns closer together, increasing the coil's inductance. Make sure you wind them the same way as the original windings

What's your current draw when the fan is operating normally?

that sounds good, but i dont want to take out the old trigger winding, i would like to incorporate it in the primary winding somehow. there is enough space to add a new triger winding

[lost66]

using a clamp meter, it is about 1 or 1.2 amps with the fan running at about full tilt. the casing sed it about 15watts

[Sephiroth]

that sounds good, but i dont want to take out the old trigger winding, i would like to incorporate it in the primary winding somehow. there is enough space to add a new triger winding

That's fine... I agree, there is plenty of space on your coils to add another (thinner) winding for the trigger.

Judging by the fried pots, I'm pretty sure that wiring them in series would be better.

[Sephiroth]

using a clamp meter, it is about 1 or 1.2 amps with the fan running at about full tilt. the casing sed it about 15watts

That sound's about right wiring the coils in series may slow the fan down, but it will also reduce your amp draw, and the circuit will (probably) operate more efficiently.

[lost66]

That sound's about right wiring the coils in series may slow the fan down, but it will also reduce your amp draw, and the circuit will (probably) operate more efficiently.

if u say in series would it be,
a1 start, join a2 & b1 and have b2 as the end (then it will be in series, and go around the rotor twice)?

[Sephiroth]

if u say in series would it be,
a1 start, join a2 & b1 and have b2 as the end (then it will be in series, and go around the rotor twice)?

That's right

[lost66]

That's right

ok cool i will get on2 it
would some thing like alarm wire b ok. amount of turns??

[Joit]

ok cool i will get on2 it
would some thing like alarm wire b ok. amount of turns??

It should be ok.
Maybe better, you look for same Ohms like your Power coil,
so actually not much.
But still a few Windings, that each Post can got some healthy induction.

_Edit_
Btw, my Comment about the Magnetfield from the Triggercoil and the Power coil field.
It will create a own Field also, when there is a resistance at the Coil,
and this Field interacts with the Field from the Powercoil.
Thats depends at the size from the Triggercoil too.
But that is kinda advanced and unprooven Thinking from me,
for now, better, you only build it easy and simple

[lost66]

It should be ok.
Maybe better, you look for same Ohms like your Power coil,
so actually not much.
But still a few Windings, that each Post can got some healthy induction.

_Edit_
Btw, my Comment about the Magnetfield from the Triggercoil and the Power coil field.
It will create a own Field also, when there is a resistance at the Coil,
and this Field interacts with the Field from the Powercoil.
Thats depends at the size from the Triggercoil too.
But that is kinda advanced and unprooven Thinking from me,
for now, better, you only build it easy and simple

cool thanx, i just striper a 24v contacter it reads out 15.5 ohms.
the current windings are about 1 ohm each, so if i join them into series, then that should give me a winding of 2 ohms,
so that means i should only use a 7th of the contacters wire?

[Sephiroth]

cool thanx, i just striper a 24v contacter it reads out 15.5 ohms.
the current windings are about 1 ohm each, so if i join them into series, then that should give me a winding of 2 ohms,
so that means i should only use a 7th of the contacters wire?

Sorry Joit, but where did you get the idea that the trigger winding should be the same resistance as the power windings???

lost66 - the trigger winding's resistance hardly matters at all as long as it isn't so high it can't pass enough current to trigger the transistor. 15 ohms is fine. You want the turns on the trigger wire to be the same as your power winding and they must be wound in parallel, so you will need to take the windings off that are already on there then rewind the coil with the trigger winding at the same time.

[Joit]

Seph,
i got the Idea from,
as i did make a Trigger Coil at a Bedini with Coils attached with to much different at Ohms,
one Coil did heat up, so i had to align them to eachother,
i did only put some more Windings at one from them.
then they been Equal, +-10 Ohms and they both stayed cool.
Size was about #24/0,4mm, so 1 Ohm is anyway a lot of Wire.

But i wont say, it is all time the case, just at mine it was.
Not sure, how it does looks like, when you have a Fan, and just put some small Wire for the Trigger on it.