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

[tinman]

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.
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.

OK-Thanks

[verpies]

I have gone and brought some mosfets-IRF 954,and will wind a coil in the same fashion as Itsu has,

Do you know how he has wound his coil and with what wire ?

[itsu]

I agree MH
There are two very bright people working on this, and yes-if there are errors, they will find them.

Itsu
Are these results still with the rotor in play within the system?
If so, what are the results without it in play?

Brad

Brad,

i think so,   but i will check that later.


The core can be seen here:
http://overunity.com/16167/sharing-ideas-on-how-to-make-a-more-efficent-motor-using-flyback-moderated/msg469253/#msg469253
so the sleeve and the welding rods (genuine bedini) are sticking out of the coil as can be seen there.
The coil is 37.8mH and 10 Ohm, wire is AWG 24 (0.5mm diameter) it was made some years ago for an Adams motor, see specs in the
earlier supplied link.

Its series bifilar, at least 4 wires where sticking out and i connected in to out getting the 10 Ohm.
I think the coil dimension should be as wide as thick.

But i don't think the core / coil is what is causing this effect, more likely some measuring error/ component screwup.
MOSFET in use is an IRF530

Will do some re-checking / tests later today.


Itsu

[verpies]

But i don't think the core / coil is what is causing this effect, ...

You can confirm that by connecting a different coil in place of the present L1.  That would be a negative experiment of sorts...
That different coil should have the same or larger inductance so it does nor screw up the current circuit.

[verpies]

...come up with some alternative ways of measuring the energy going into the drive pulse.

Let me give you same data to chew on:

According to the latest scopeshot, the energy expended by the power supply to bring L1's current from 0 to ~600mA is 17.745mJ, however according to the standard formula for energy stored in a coil E=½Li², the magnetic energy stored in a 37.8mH coil conducting ~600mA of current is 6.804mJ.
That is a big difference between what was consumed and what was stored in L1

The missing  ~11mJ  is easily explained by the mechanical energy gain of the rotor as well as hysteresis and resistive losses, but maybe this calculated energy imbalance will point you to a better explanation, what is going on.