Reviewing Pulse Motor Circuit Ideas and Theory

[shylo]

I said "Also couldn't you be collecting the spike from the trigger coil and choke as well?"

You said"You can,but there is no point,as it is simply divided between all three windings."

What if they all work circuit wise , independent?

No two spikes ever happen at the same time.
artv

[tinman]

It looks to me like both circuits don't work at all.  I am not doubting Carroll's statement that the
current draw is reduced but it certainly isn't because the storage capacitor is being charged and
the charge is being used for the next pulse.

Taking a third look at Carroll's circuit I see one totally bizarre path for charging up the storage
capacitor but it looks like only a fraction of the energy in the power coil would actually make it
into the storage capacitor.  Then Q2 may or may not work, I am not sure.  I am not sure how
an AC-coupled NPN transistor base input will behave because it is a non-standard circuit that
doesn't make sense.

@MH

Could you explain as to why you believe that the circuit i posted looks like it wouldnt work?.

The idea behind the circuit,is to be able to use just the one battery,and be able to send the bulk of the inductive kickback current back to that battery-without it following the current loop path through the circuit-->that is,the standard SSG circuit.

The scope clearly show's that the circuit works as planed.


Brad.

[tinman]

I said "Also couldn't you be collecting the spike from the trigger coil and choke as well?"

You said"You can,but there is no point,as it is simply divided between all three windings."

What if they all work circuit wise , independent?

No two spikes ever happen at the same time.
artv

Ok,first-there is no spike through L3. That was the whole point in adding that inductor.

Second
As the run and trigger(as we call them)coils are wound together,there would be no point in splitting the inductors stored energy into two,and capture that inductive energy spike from both coils. In fact,there would be further losses,as you would also need another diode on the trigger coil to capture that inductive spike energy.


Brad

[MileHigh]

Brad:

I can't see a conduction path for the discharging power coil on your schematic that charges the
battery.  Also, I don't see anything on your scope display that shows the traces are
inverted.  If the battery current trace is not inverted then a positive spike means the
battery is discharging, not charging.  Beyond that, I can't explain your scope traces in
general, there is a lot going on there.

Okay, similar to Carroll's schematic I took a third look at the current path.  Here is what I think
happens when the power coil L1 discharges.  The current can go through L3 or through the battery
and C1.  L3 will initially block the current so the current will go through the battery and C1.  That
will charge the battery.  However that will reduce the voltage in C1 and right away the battery
will start to recharge C1 through L3.  So you have a battery charge-discharge event every
time the power coil L1 discharges, which looks like a net zero sum game.  It would be a good
pSpice simulation because you could play with the component values to see how the timing
changes.  You have to remember that with large enough inductors, it's possible that there will
be a continuous flow of current through L1 and L3 when the pulse motor is on.

There is another "unknown" factor that may further complicate things.  It's the EMF induced
in L1 from the passing rotor magnets.  I think in the battery current trace you might see
a curve there that shows the EMF signature causing current to flow but I am not sure.

MileHigh

[tinman]

Brad:

I can't see a conduction path for the discharging power coil on your schematic that charges the
battery.  Also, I don't see anything on your scope display that shows the traces are
inverted.  If the battery current trace is not inverted then a positive spike means the
battery is discharging, not charging.  Beyond that, I can't explain your scope traces in
general, there is a lot going on there.

Okay, similar to Carroll's schematic I took a third look at the current path.  Here is what I think
happens when the power coil L1 discharges.  The current can go through L3 or through the battery
and C1.  L3 will initially block the current so the current will go through the battery and C1.  That
will charge the battery.  However that will reduce the voltage in C1 and right away the battery
will start to recharge C1 through L3.  So you have a battery charge-discharge event every
time the power coil L1 discharges, which looks like a net zero sum game.  It would be a good
pSpice simulation because you could play with the component values to see how the timing
changes.  You have to remember that with large enough inductors, it's possible that there will
be a continuous flow of current through L1 and L3 when the pulse motor is on.

There is another "unknown" factor that may further complicate things.  It's the EMF induced
in L1 from the passing rotor magnets.  I think in the battery current trace you might see
a curve there that shows the EMF signature causing current to flow but I am not sure.

MileHigh

MH

The idea of the circuit,is simply to use just one battery,and be able to send the HV spike back to that battery. This cant be done with the standard SSG circuit,using just the one battery,as a current loop is formed,and the motor would simply stop or bog down,and use excessive current.
L3 stops the HV spike following the current loop path through the circuit,as it(L3) is seen as a large impedance to the HV spike,and so that current from the spike follows the path of lease resistance,which is through the battery.

L3 allows current to flow into C1,but becomes a high impedance during the inductive kickback spike.

That was the only job this circuit is suppose to do,nothing special is suppose to take place.

We can now desulphate the same battery that is running the circuit.


Brad