Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[verpies]

In the meantime I've enlarged the pics and added a few notes.

These notes are correct.
I will not elaborate now...still in Xmas mode

[synchro1]

Hi Brad

thanks for your additional posts and interest.
I'm away for a day but Monday afternoon I'll be back and can further test this.

In the meantime I've enlarged the pics and added a few notes.

Luc

@Verpies, Tinman and Milehigh:

Luc has a scope shot above labeled "Reverse direction Flyback". How does this equate with your "Same direction" theory for BEMF?

[gotoluc]

@Verpies, Tinman and Milehigh:

Luc has a scope shot above labeled "Reverse direction Flyback". How does this equate with your "Same direction" theory for BEMF?

Hi synchro1,

you are still under moderation but I will allow your posts as long as they conform to the rules I wrote in my first post of this topic.

It's true I've suggested a reverse flyback on the bucking E cores but with a question mark.  Let's allow the EE to think about it a little and see what they make of it.
I will be performing the test TinMan has suggested to see what other results come of it.

Kind regards

Luc

[verpies]

Luc has a scope shot above labeled "Reverse direction Flyback". How does this equate with your "Same direction" theory for BEMF?

It would be a violation with one coil, but with two coils one can push flux and current into the other coil.
Without seeing two gate waveforms (or d-s) on the same scopeshot, it is difficult to conclude much more.

Loosely coupled inductors ( a transformer with low k coupling coefficient ) are notoriously hard to analyze when they have capacitors across these inductors on both sides.  Without the diodes in series they behave like a tuned transformer.

[itsu]

I build the below verpies "C2 discharge" version (so with the MOSFET driver), and found the below screenshot signals.

As normal, blue is across CSR (point A to B)
Purple is across the Q1 MOSFET drain (point C to B)
Yellow is across the C2 cap (point D to B).

C2 cap is a 2.2uF one

2e screenshot is a zoomed in one.

Is this the kind of signal you would expect for the yellow one?

Regards Itsu