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

[verpies]

If so,then it is possible for Itsu to reduce the current flow time,

Yes, reducing current flow time increases the efficiency because of this effect but not because of saturation avoidance...at least in Itsu's current system.

Do you think that these results have anything to your theory you told me about in an Email some time back?

My theory had to do with moving (or vibrating) soft ferromagnets.  Do Itsu's results have anything like that in them - I don't know yet.

[verpies]

Once the current ramp flattens out, this is the point of core saturation - is it not?

No, the flattening out of current means hitting the V/R limit (usually caused by the current flowing too long).
On a scope, the saturation curves the coil's current up, that is in the opposite direction.

[tinman]

Not.
On a scope, the saturation curves the coil's current up, that is in the opposite direction.

Ah-ok,learn something new every day. I was of the belief that once the current trace had flattened out,then maximum current flow had been achieved,and the magnetic field would not get any stronger or greater. Or maybe that part is correct,and the core saturation curve would only be seen when the current being supplied to the coil is much higher than we are delivering at the moment ?.


Brad

[verpies]

Ah-ok,learn something new every day. I was of the belief that once the current trace had flattened out,then maximum current flow had been achieved,and the magnetic field would not get any stronger or greater. Or maybe that part is correct,

It is correct.
The magnetic field does not get any stronger or greater, because the circuit's resistance limits the current according to Ohm's Law  i=V/R ,...not because of any magnetic or core effects.

and the core saturation curve would only be seen when the current being supplied to the coil is much higher than we are delivering at the moment ?

Yes, but that can happen only if the V is high enough or the R is low enough, in the Ohm's equation i=V/R.

Bonus Rant:
What if both of these phenomena occur at the same time?
The V/R limit wins out eventually but for a while they can superimpose on each other and obscure each other.
The down curve (due to the V/R limit) usually has a different shape than the up curve (due to saturation) so they don't superimpose on each other perfectly and some intermediate current curve results for a short while.

[tinman]

Yes, reducing current flow time increases the efficiency because of this effect but not because of saturation avoidance...at least in Itsu's current system.
My theory had to do with moving (or vibrating) soft ferromagnets.  Do Itsu's results have anything like that in them - I don't know yet.

I was just thinking about what Itsu has used for a core--an odd combination at best.
If i am correct,those welding rods are black iron welding rods used for fusion welding with a naked flame or tig welder(hot arc). The dina bolt sleeves have a slit in them from one end to the other,and so no full turn is complete--dose not act as a shorted turn.

I have gone and brought some mosfets-IRF 954,and will wind a coil in the same fashion as Itsu has,although i am not sure if he has left all the rods hanging out the back of his coil,or has trimed them back to the former length. I will do this on my thread,as this thread(Luc's) is about sending the flyback to a second inductor,and increasing motor efficiency,where as i am sending the fly back to a battery--but the cap seems to be a better way to measure P/in to P/out.


Brad