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

[gyulasun]

....
When the I core is in between to two E cores with the same cardboard spacer but now one on each side (so two) the inductance is 16mH. So only a 3 mH increase as appose to E to E with one spacer.
....

Hi Luc,

I must have been in "Xmas mood" and overlooked the cardboard gap for the case when the I core was used, and this is why I did not notice what verpies mentioned, sorry for these mistakes.

Gyula

[tinman]

Thanks for your brave reply Brad
That's about how I understood it as far as the I core being there in place or not but you would think these Large MOT E cores could store up a little flux of this short pulse, no?   and where does the flux go?   does it just leaks in space?
Did you notice the voltage pretty much fell flat instantly and how can the current instantly go to maximum on an inductor?
What part of a bucking field is Chris suggesting to be used?

Luc

I was thinking the same thing at first,but have a look at your last scope shot's you posted
Only one of the four show's near 0 volts across the coil--just a small voltage pulse at the start.
And it just so happens that the one with near 0 volts across the coil is also the only one where the flux path is incomplete for the two coils-->that being E to E with power to both coils. This one with near 0 volts across the coil will be the one that consumes the least amount of power,yet the current tells us that it will also be the one that produces the greatest !!radiant!! magnetic field(field not contained within the core). If this field is used to produce work ,will it reflects on the P/in?-->will it raise the voltage seen across the two coils?. If it dose not raise the voltage,but increases the current-->what happens to the voltage across the coils when the current is increased?-my guess is that the voltage would actually go down as the current increases

I think Luc that you may be on the verge of seeing if what EMJ is saying is actually true.
I would like to see (if you still have them) what a secondary coil (a coil behind one of the primaries)shows across it in this bucking coil mode- E to E,both coils powered.

Brad

[tinman]

Thanks for your brave reply Brad
That's about how I understood it as far as the I core being there in place or not but you would think these Large MOT E cores could store up a little flux of this short pulse, no?   
Did you notice the voltage pretty much fell flat instantly and how can the current instantly go to maximum on an inductor?
What part of a bucking field is Chris suggesting to be used?

Luc

and where does the flux go?   does it just leaks in space?

In fact-yes.
But this space is the air gap between the two coils and the outer legs of the E cores that carry the opposite field,as the field must join/merge. It is this field you must tap into,although i dont think you would have the room between the two coils and outer legs of the E core's to place an air core coil.

Brad

[gotoluc]

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

[tinman]

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

Mmm-so the voltage drops to near zero,but the current is still strong right until switch off.

When you get back into it Luc,could you try the simple circuit below,so as we can see both the current and voltage across both coils when switch 1 is open and closed--just so as we remove all the caps and diodes. Use a mosfet,and not the transistor i have depicted. Dont take note of coil wind direction,as i just ghosted and flipped one drawing. Just make them bucking as you did before.

Enjoy your time away


Cheers
Brad