Muller Dynamo

[Scorch]

Ok; back to the drawing board for me.
If saturated coils, possibly resulting in acceleration under load, or, at least, no deceleration under load, is the goal; then the position of the sewing bobbin coils must be a lot closer together so the magnetic fields never completely leave the coils.
See image.

Based on other designs; here is the current direction I intend to take this:
Going to try six coils with six magnets spaced so that magnets always over-lap the coils.
Will be a compact, dual rotor, design with one 'motor' section and one 'alternator' section.
Will use the absolute cheapest, and simplest, methods in terms of air cores and basic switching such as brushes, commutators, and solid state relays to capture BEMF and sine wave peaks.

This will be a very compact design intended to be easy to transport and present in classrooms or meetings.
Dimensions will probably be that of a cube of approximately six inches and four inch rotors.

That is all for now.

}:>

[Lakes]

You can download that degree wheel from
http://www.machinerycleanery.com/DWUniversal.htm

I`ll modify it for 360 deg and print onto a (scrap) CD

[Scorch]

Was able to cut, and drill, 4 stator plates, and cut two rotors, in about one hour including mapping out template on grid paper.
Stator plates are 1/4" polycarbonate. Rotors are 1/2" polycarbonate.
Used hole saw, band saw, and drill press. No CNC.

This is going to be a pretty cool, 'pocket', sized dynamo.
Might be a challenge to fabricate other components to size.
Will have to fabricate small timing plates and switches as well as acquire other, smaller, components such as SSRs, rectifiers, and capacitors.

}:>

[shinz62]

Scortch,


Have you seen this?


http://www.youtube.com/watch?v=fJl0TO_aR6M


It looks very interesting.

[Magluvin]

Scortch,


Have you seen this?


http://www.youtube.com/watch?v=fJl0TO_aR6M


It looks very interesting.

Nice demonstration. ;]

But this is where things get sticky.  I would say that he needs to show the 12v motor driving the wheel, without 'any' pickup coils or cores near the rotor. The pickup coils, unloaded, the cores cause a drag on the wheel.

Soo, if the rpm goes up and amps in goes down if we remove the cores and the wheel is spinning alone, would those rpms and input amps be lower than what he has shown with the U shaped core pickup coils loaded?  If so, then that difference is where the energy comes from to run the loads, and there is no free lunch.

We have to remember that those cores, along with the ones on the bottom, all cause drag. Wasted energy if the coils are not loaded. In his test, while loading the U coils and showing speed up and input decline, if he removed the 2 bottom coils/cores, the speedup would be more and the input would decrease again!  His numbers would be better due to eliminating waste.

So the final approach would be, does the wheel running on the 12v motor 'alone', no cores/coils in place, spin faster along with less input than with the U coils mounted and loaded as shown. Simple. If so, then one could measure and calculate the power used in the loads to see if it all just adds up. And if it comes up even steven, that is pretty good efficiency for all the things going on there, and would be quite an accomplishment. 

Maybe the guy would be willing to do these things to come up with a stronger conclusion as to what is really happening.

Mags