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

[gotoluc]

I found this one pretty cool. And in line with the discussion.

https://www.youtube.com/watch?v=41cfHcb7qd8

Yes MoRo, it's definitely relevant!... and it's not coincidence because Cool Joule is user minoly who was here at the beginning of the topic preaching about JB: http://overunity.com/16167/sharing-ideas-on-how-to-make-a-more-efficent-motor-using-flyback-moderated/msg466014/#msg466014

He hasn't posted since I was strait forward with his assumptions, some pages later but I'm glad he is experimenting with the concept which apparently is JB's

Anyways, it's for everyone to experiment with and I wish him well and he is always welcome to post his results here if he wishes as I don't hold grudges.

Thanks for sharing and please continue to post his experiments if he chooses not to do so himself.

Luc

[verpies]

Verpies I've been trying to get my head around what you said. Below is a screenshot from 2010 when I was working on the ossie motor. I assumed at the time the spikes were pulses from the reeds and the sine was from the spinning magnets. I have this wrong it seems? I thought that in a pulse situation a current would induced in the coil by the magnets when the dc pulse was not present. From memory that build had 4 coils but I'd have to go back and check.

Your scopeshot seems to be showing a voltage across a coil, so it is difficult to conclude what the current flowing through that coil is when that coil is closed by a circuit.  Anyway, with this voltage oscillogram, the spikes appear to be occurring when the coil's current is interrupted (the reed switch opens) and the sinewave could be the emf induced by moving magnets (twice per reed closure) or an LC interaction with some capacitance.

When a coil is connected across a C.V. power supply then the coil is effectively shorted and its current can flow uninterrupted. Thus the externally induced current can flow in a coil regardless whether it is shorted by a jumper or by a C.V. power supply ...in a "pulse situation".

[tinman]

Yes MoRo, it's definitely relevant!... and it's not coincidence because Cool Joule is user minoly who was here at the beginning of the topic preaching about JB: http://overunity.com/16167/sharing-ideas-on-how-to-make-a-more-efficent-motor-using-flyback-moderated/msg466014/#msg466014

He hasn't posted since I was strait forward with his assumptions, some pages later but I'm glad he is experimenting with the concept which apparently is JB's

Anyways, it's for everyone to experiment with and I wish him well and he is always welcome to post his results here if he wishes as I don't hold grudges.

Thanks for sharing and please continue to post his experiments if he chooses not to do so himself.

Luc

Yes, a visual on how the joule thief works, only repelling a magnet with the kickback in stead of lighting an LED. How ever, believing that the kickback has more energy than that supplied to the primary , just because the primary dosnt move the magnet-is wrong.


Brad

[Jimboot]

Your scopeshot seems to be showing a voltage across a coil, so it is difficult to conclude what the current flowing through that coil is when that coil is closed by a circuit.  Anyway, with this voltage oscillogram, the spikes appear to be occurring when the coil's current is interrupted (the reed switch opens) and the sinewave could be the emf induced by moving magnets (twice per reed closure) or an LC interaction with some capacitance.

When a coil is connected across a C.V. power supply then the coil is effectively shorted and its current can flow uninterrupted. Thus the externally induced current can flow in a coil regardless whether it is shorted by a jumper or by a C.V. power supply ...in a "pulse situation".

Thanks mate, yeah I should have explained that the probes are simply across the coil. The sine wave was definitely being created by the spinning magnet so idea of how much current was there at the time. I assumed (probably wrongly) that the efficiency of this motor was due to that power recirculating in the circuit. I believe the general consensus at the time tho was the capturing of the flyback was what made it so efficient. The Ossie motor is basically a couple of reeds and a FWBR. Certainly no caps, I probably still have the inductance numbers somewhere.  Thanks

[verpies]

It's a fact that, given the same power input to two inductors of the same resistance, the inductor with twice the length of wire (and half the per-metre resistance) will give you a stronger magnetic field. For the same power input.

What about the difference in inductances of these two coils ?
If the inductances are different then how do you propose to keep the input power the same?  Alas, the input power vs. time, greatly depends on the inductance.