Gort Newton: Very nice. Love the simple arrangement, and it is very effective. What do you use the trifilar windings for?
Also, a spring-loaded tensioner between the lower coils (the feed coils) and the take-up spool can make the winding neater.
Matei Bogdan: it's like the gear wheeles the little one is spinning faster and the big one is spinning slower . same is the principle at bycycle the report is 1 turn at the foot wheel and 5 turns at the drive wheel. To pedal slow and go faster. Excuse my bad english!
electrofly23: for a counter I used a digital pedometer from the dollar store - I wired in a reed switch and put a small magnet on the motor shaft. For speed control I used a footswitch from a sewing machine - it works like a gas pedal from off to full speed - no need to use a dimmer.
rockethead555: Hello!, good design . . i was coming up with something similar but never thought about the three coils mounted in a circle like that. . haha smart trick. Anyway talking about number of turns for a given Inductance and a given wire length for a predetermined "dc resistance", i see it would be hard to determine with the twisted wires approach say for a bifilar or trifilar because that design uses more feet of wire versus straight turns of wire.. so how would you calculate the L for this ? thanks
Helmy Yehia: good clip
Ben Silva: this is pretty freaking awesome
Both diameters are fixed on the same shaft. 360 degrees of rotation on both diameters per turn equals one turn per rotation on both. Think about it ; )
KaleemNiz: calculator can not calculating the actucal number of trun because the diameter of ur dril which is pressing the button of calculater is less then the cap of coil which ur using for wind....
Sutthi Rungsrirattanawong: Try using smaller hole less then 1cm on the feeding side & increasing distance between winding spool & the feeding spool further apart (50cm++) once the first layer is done nicely, by controlling the right speed the following layers will be auto arrange
Sutthi Rungsrirattanawong: Nice! When i put together mine, it took me sometime to figure out what to use for counting,after squishing 1calculator & 1keyboard i ended up using a "thumb pressing" counter. together with a few bigger hole washers (place them off-center) as trigger. it can count up to pretty high RPM without miscount, and can withstand harder beating from the drill's torque.
kurdishmob: kholy crapz. ur da man.
Marneus Calgar: Very well done sir :)
GHOSTTOYS: ingenius hahaha
77GSlinger: freaking brilliant! Thank you!
I would agree with that if you are running the filars in series. But when using each filar individually I would say it can help ensure each wire has identical L and C characteristics. I would also agree that you could make a coil smaller without the twisting, but in practice ive found I usually end up with a rats nest when dealing with untwisted multiple wires, but sure it could be done. Ive never had any problem with short circuiting. I would say do what ever works for you.
JRBeaman: @codygillespie I would expect that twisted windings would actually take up more space than conformal windings. The purpose of winding layers in bifilar or trifilar method is to reduce self inductance characteristics and actually increases the capacitance to help compensate for back-emf characteristics which could damage semiconductors. The twisting has me baffeld as I see no advantage & could cause potential concentrated mechanical stress points for potential short circuiting in the windings.
Well as far as function its not something that would always be required. Mainly it helps keep distributed winding capacitance even. Also for practical reasons it helps keep the coil compact and tidy.