Akula0083 30 Watt Self Running Generator.

[MileHigh]

Dave:

Im sorry but no its not, it doesnt explain femf or bemf.

The animation might not explain it but it does show you the BEMF and the FEMF in action.  Just slow it down a bit.

The colours are showing you the voltages around the loop.  When the switch opens you can see the right side of the coil start to turn green as the discharging coil charges up the capacitor to high voltage.  That's the FEMF.

The BEMF is less evident colour-wise but you can see how the coil has a colour gradient on it also.  Look at the coil when the switch closes, that's the BEMF.

Your ideas about a coil being "charged negative or positive" are wrong.  There is no charging of the coil in the sense of a negative or positive potential and ions and all that stuff.  There is the current through the coil, and the voltage across it.  The coil is "charged" or "energized" with energy when there is current flowing through it.  It's that energy that creates the FEMF.

MileHigh

[wattsup]

@MileHigh

Just got back home from late night jamming with 10 musicians all guys I have know for 45 years so I will be looking at your posts (with thanks) more closely today.

Are you considering that the transformer is a three gap E-core possibly running at resonance and not a standard transformer running at 60Hz forced reaction. Do the simulation programs differentiate between these coils types. If not then they may not apply.

There is a certain part of EE that may not consider any re-biasing of the secondary during part of the cycle. When I say re-biasing, maybe via an analogy of a swing, when the swing goes from right to left, the re-bias immediately sends the swing back to the right side so it can have a complete swing on the next release, thus providing a maximum swing on each release without losing momentum that would occur if the swing had to move back to the right hand side on its own.

Is there a way to simulate the copper strip?

I think we should forget the stop switch since this circuit is designed to operate with the stop switch shorted.

I'll be back later.

Where's the coffee.

wattsup

[verpies]

I'm sorry but no its not, it doesn't explain femf or bemf.

It does. 
You can see it more clearly if you slow it down or double click on the inductor to edit it and increase its inductance.
Back EMF is the voltage developed across the inductor in opposition to the increase of the current flow through it. 
Forward EMF is the voltage developed across the inductor in opposition to the decrease of the current flow through it.
They can be seen as varying colors of the wires leading to the inductor.

[Dave45]

The colours are showing you the voltages around the loop.  When the switch opens you can see the right side of the coil start to turn green as the discharging coil charges up the capacitor to high voltage.  That's the FEMF.

This is exactly what Im talking about, by looking at the circuit in the conventional view you see femf when actually thats the bemf, you dont see that there is a polarity change as it moves through the diode.

oh well i tried.

later
dave

[verpies]

Dave, in your Falstead sim can you put scope testpoints right at both ends of the coils, and watch the voltage traces there as a pulse happens?

Yes, in this simulation the upper trace is the current flowing through the diode (not reversing!), the middle one is the voltage across a capacitor and the bottom one is the voltage across the inductor.
The latter one reverses polarity between +6V and -12V each cycle in order to oppose attempts to change the current flowing through the inductor.