Quote from: Ufopolitics on April 06, 2022, 11:00:09 AM

@Pix,


Thanks, I do understand what you and Bistander are explaining, believe me, very clear...


But "reversing this process" brings more complications, as I do not want to involve (for now) any input from main 3 phase ...can you understand my point?
For me it is way easier, to start demonstration with a DC Constant Rotating Field...just one input, plus and minus, and just two poles, North and South, simple.


As for those that want to try using electronics to do their switching, it is also easier, much more easier, to start with simple DC Input, that could be switched easier and cheaper, than trying to make a Three, out of phase, smooth sinusoidal signals...


It is about to "prove a concept"...and to make it as simple as posible...for sake of understanding by all audiences.




Thanks again




Ufopolitics

Ufo,
I, and I assume Mr. Pix, have no issue with you doing it your way. But please stop stating that it "can't" be done with Alternating Currents.

And with the availability of motor speed controllers, 3-phase is easily, and cheaply, synthesized from DC.

Good luck with your project.
bi

bi, alternating currents will not work for this thing....well, not sure if cc will do but there is big difference between how they work.
as i remember from school, current into a coil increase from the time is connected till reach a limit. into a capacitor is maximum at beginning then decrease.
on this particular experiment should not be interrupt the supply, so a almost steady current will flow. only rotate brushes without breaking contact.

for those that also follow...
attached some of my  work, old rotor re-winded and collector coils on iron core

Quote from: bistander on April 06, 2022, 12:30:40 PM
Ufo,
I, and I assume Mr. Pix, have no issue with you doing it your way. But stop stating that it "can't" be done with Alternating Currents.

And with the availability of motor speed controllers, 3-phase is easily, and cheaply, synthesized from DC.

Good luck with your project.
bi

Thxs Bistander,


But of course, however, now on your last statement (bold out by me) you are talking about DC Three Phase, as use on BLDC Motors...Now, that is something else, as they do have a flat side and not a curve sine...however, they constantly collapse the Field, and It is a big "No,No" on this setup, if we want it successfully done.


That is my reason to reject AC.


Not that I am saying AC does not generates a rotating field...pls, do not take me wrong.




Regards




Ufopolitics

Ufo,
See article: https://en.m.wikipedia.org/wiki/Variable-frequency_drive

Simply connect DC source to the "DC link", between the rectifier and inverter bridge. I've done it a hundred, or more, times. And the windings on the outputs smooth the current waveforms and the resultant signal (power) is close to that of an AC mains.

These "AC Drives", as they are called, can be found, used, or surplus, fractional kW, in good working condition for like $100. A suitable used motor probably for less.

While it might work, I'd stay away from BLDC drives.
bi

Quote from: marcosbk on April 06, 2022, 12:45:05 PM
bi, alternating currents will not work for this thing....well, not sure if cc will do but there is big difference between how they work.
as i remember from school, current into a coil increase from the time is connected till reach a limit. into a capacitor is maximum at beginning then decrease.
on this particular experiment should not be interrupt the supply, so a almost steady current will flow. only rotate brushes without breaking contact.

for those that also follow...
attached some of my  work, old rotor re-winded and collector coils on iron core

marcosbk,
I am not saying AC will work on any particular experiment.

Just stating the fact that a constant traveling magnetic field can be formed from polyphase AC. It's done all the time.
bi