Winding my first (bifilar) coil.

[synchro1]

@antimony,

Wrap it tight! Professionals hang weights between the spinning lathes and the wire skeins to insure uniform tautness.   

[antimony]

Your AWG 23 per 40 meters will give you a resistance of around 2.7 ohms,and 40 meters of your AWG 26 will give you about  5.3 ohms resistance. 5.3 ohms is good for a 12 volt pulse motor,but 2.7 may be a little low-->but if you use a 2n3055 transistor,it will handle the current without much trouble- if you go with the 40 meters of AWG 23 as your run coil.

I have found that winding the(what is called) trigger coil on your core first,and then the heavier run coil over the top of that,gives much better results and performance. So i would go with a core that is around 19mm in diameter,and around 65mm long. Then wind your 40 meters of AWG 26(your trigger coil) on the core,place one layer of insulation tape over that,then wind on your 40 meters of AWG 23(your run coil). Your magnets for the rotor would best have a diameter of 1/2 to 3/4s that of the coil core. Also alternate the poles of the magnets on your rotor-->do not use all north or south out,despite what you may have heard. This way,if you are going to use a soft iron wire for your core material,the core will not become magnetized after time.


Brad

Hej Brad, thanks for the info.  It really cleared out a lot of things.
I have made one spool out of 20 mm pvc tubing , and wooden ends. The visible tubing is 65 mm.

In schematic it say that the bifilar wire is going to be wind 850 turns. I dont think 40 meters is going to be enough for 850 turns,  so i have to join wires from another full spool.
Do i solder the ends together?

Sorry that i dont respond to all of you, i dont have access to my laptop now.

Ps.  I found your channel on YouTube, Tinman.  I will check it out tomorrow.

[tinman]

Hej Brad, thanks for the info.  It really cleared out a lot of things.
I have made one spool out of 20 mm pvc tubing , and wooden ends. The visible tubing is 65 mm.

In schematic it say that the bifilar wire is going to be wind 850 turns. I dont think 40 meters is going to be enough for 850 turns,  so i have to join wires from another full spool.
Do i solder the ends together?

Sorry that i dont respond to all of you, i dont have access to my laptop now.

Ps.  I found your channel on YouTube, Tinman.  I will check it out tomorrow.

Just wind on the 40 meters of each size wire-->it will be fine.
Saying to wind 85o turns means nothing at all--it is just something they put on paper because they need to. The original amount of turns for the SSG by Bedini stated that 450 turns was optimal--but optimal for what?. There are so many variations in pulse motors,so you just start with what you have,and work and learn from there on. Turns or raps on the coil come down to what current your transistor can handle,what voltage you will be using to run the motor,what size your rotor is,what magnets you are using--there are so many things that need to add up to make a good pulse motor,but the best way to learn is by trial and error.


Brad

[antimony]

Just wind on the 40 meters of each size wire-->it will be fine.
Saying to wind 85o turns means nothing at all--it is just something they put on paper because they need to. The original amount of turns for the SSG by Bedini stated that 450 turns was optimal--but optimal for what?. There are so many variations in pulse motors,so you just start with what you have,and work and learn from there on. Turns or raps on the coil come down to what current your transistor can handle,what voltage you will be using to run the motor,what size your rotor is,what magnets you are using--there are so many things that need to add up to make a good pulse motor,but the best way to learn is by trial and error.


Brad

Ok, i will do that then. If you didn´t notice, i am kind of new to electronics in whole, so if i read "wind the wire 850 turns" i will try to do that.
I am doing this project in hopes that i will gain some knowledge from it, and progress from there.

Thanks Brad. I appreciate you helping me.

[antimony]

Hey, Brad. I took your advice, and wound two coils with the whole spool of 0.40 mm until it was no more wire. Of course i had 0.57 mm wire too, but i didn´t use up the whole spool of that wire.
I counted the turns on the last one, and it came to 487 turns. The first one i lost track of, and didn´t bother to count that one.

I remember you wrote that there were some ohm resistance value that you usually are aiming for. Is that correct, and if so, can i just use my multimeter to get a reading of it?

Another thing i was wondering about is the rotor. I am using a hard drive rotor now, but its bearings are very bad and would like to change to something different.
I was thinking i would use plexi glass. Also, i have a few great ball bearings that i have worked for a while now.
How do you normally install a rotor with ball bearings?

Thanks in advance.