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

[verpies]

Rather than say both coil's,lets just see it as one coil where a 1 ohm CVR is tapped into the mid point of the turn number. Anyway,lets say the DUT is my circuit on the other thread-the SSG circuit. In this case,the CVR that is in the center of the coil windings should read a higher average current flowing through the coil than that which is flowing into the coil--where that current is also viewed by way of another 1 ohm CVR.
Correct?.

No, unless the wavelength of the driving waveform is close to the length of the coil as described in this article.
Kirchhoff's Current Law is the one that describes the conservation of currents in circuit branches, unless significant EM radiation occurs according to Maxwell at higher frequencies.  That's how radio antennas work.

[itsu]

If you have four of these cheap HEF4047B  chips (CD4047) then a universal motor sequencer can be built that will have the capability of positioning the ON-pulse anywhere and have an additional output for emptying C2 before each "flyback" pulse, for accurate recovered energy measurement..
Yup, you have to compensate lower pulse width with higher amplitude (supply voltage).
Was that current waveform obtained from this trivial circuit?
It is the induced current  waveform shape that matters the most anyway - with alternating N, S magnet poles (like Gotoluc suggests) this waveform will appear significantly different.

No 4047's here.

Yes, that current waveform was obtained by that trivial circuit.

Itsu

[gotoluc]

...but you can try a low value resistor (or even a 0Ω short) to see that the noise at switch-OFF really disappears.  If it does, then emptying C2 will accomplish the same feat and more.

I tried it with a 1 Ohm and a 0.1 Ohm on C2 (see shots) and there is a difference but it does not fix it. Even a short does no fix it.
I found this gets worse as I raise the voltage. I'll scope the opto and gate of the switch to see what is going on there.

Luc

[MileHigh]

There is no spiking noise on your waveform for the current - that's impossible.  It's just spiking noise on the voltage waveform channel cross-coupling to the current waveform channel.  The way you have the probe cables arranged may have something to do with it.

[verpies]

I tried it with a 1 Ohm and a 0.1 Ohm on C2 (see shots) and there is a difference but it does not fix it. Even a short does no fix it.

So there is something seriously wrong.
Are you sure that you have the point A connected to the negative terminal of C2 and the CSR ?