about charging batteries

[Ren]

I twisted (litzed) my windings together, although I havent anything to compare it to to see if it makes a difference. In actual fact it can wreak havoc with impedances if not done perfectly, and I will be winding without litzing in the future. Its nearly impossible to get your twists per inch uniform by hand.

I wound my first coils by hand, a mistake I will not be making again! It took forever. Subsequent coils were wound with a battery drill. You can get it pretty neat if you take your time.

If you havent made your rotor yet I can offer you some other advice regarding construction. Try to match and space magnets equally around the perimeter. It can be time consuming but by far one of the most important parts of construction. A uniform air gap between the magnet and coil will improve your performance. If one magnet is further away from the coil than others it will induce less voltage and the triggering of the base will be different to that of other passing magnets. This can make your pulses uneven in strength and frequency somewhat.

Most of all take your time, clean and solder joints and dont rush, you'll be much happier with the finished product in the end.

And show us some pics!

[prometei]

@Ren, cool, I've seen your videos b4. The one motor that you have outdoors, with the Acryl or Plexiglass disk, did you buy the disk or made it yourself?

@prometei, Ren

Did you guys drill your trifilar windings?  I am building a Bedini motor this weekend.   

My coil is bifilar wound and sloppy. I'm still brainstorming on how to build a decent coil winder. BTW, read this http://www.overunity.com/index.php/topic,4367.msg86830.html#msg86830 and maybe the whole thread, some interesting info on litz wires.

[Ren]

The rotor I got laser cut and the center hole tapped for precision. I had to recess the magnets in myself, made a template on the pc and went from there. Its very easy stuff to cut and shape, but rather expensive to make mistakes on! Rotates on a modified vcr hub, silky smooth and super fast!

[Pirate88179]

@ Ren:

That is what I am attempting to use, modified vcr hub.  Like you said, smooth, balanced and nice low friction bearings.  I kept the original diameter for the rotor and was planning to use 4 magnets equally spaced on the circumference.  Do you think this is enough?  I have it mounted on a nice piece of aluminum I salvaged from an old monitor where I have enough room to mount heat sinks and circuit.  I enjoyed your videos too.

Bill

[Ren]

Hi Pirate,

You can build as small as you like, you wont get much flywheel effect, but you will get some high speeds! Make sure you glue the magnets on real good, rough up the surface a bit and use a two part epoxy. Also put a little shield around it until you know they arent gonna fly off!

Make sure the magnets are spaced far enough apart, at least 1-2 magnet widths, your gonna need small magnets for that. Smaller rotors can be a little harder to start and adjust, but when they get going they really sing.

Sorry to burst your bubble but aluminum is not the best choice for supporting structures as it can slow rotation if it is near the magnets due to it being paramagnetic. A piece of wood would work better or some plexi. Aluminum as the rotor is fine however because it rotates with the magnetic field.

I made a high speed rotor that had four neos embedded into the vcr rotor with resin, worked quite well and was safe. Had to have it sit ontop of the coils though as the north faces werent around the circumference. Many options to play around with.