Circuit setups for pulse motors

[robbie47]

Little bit dissapointed as I can only seem to get the 12v 7amp hours up to 13.10v. I can charge two or three though before the run goes flat. Think I need a bigger coil, or more of them.

Ren, I don't think bigger coils are required here.
A small hint from my side:
The peak voltage is occuring just after switching off the current in the coil.
In theory: U_coil = L x dI/dt
In other words the coil value times the the steepness of the switching off of the current is a measure for the peak voltage (that is used for charging). With the coil you have in use it should be very feasable to obtain a few hundred volt peak voltage (without load)
So, maybe the transistors do not switch off the current fast enough.

Another reason could be that the iron core is saturated when the magnet is passing.
Enlarging the distance between the top of the coil and your magnets could help in such case.

B.t.w. what exactly do you mean with "I can charge two or three though before the run goes flat"?
Charge two or three discharged batteries from one charged battery?

[Ren]

Perhaps your right Robbie. I have noticed on Bedinis schematics that the core diameter is the same width as the magnet that passes. I made my coil before I noticed this and it is 20mm where as my magnets are 25mm. Could this perhaps cause the transistor to fire for a longer period and not cause the sharp gradient which is desired?

I used tie wire for the coil, which other people seem to have had great success with. I placed some neos on it for a couple of hours and then removed and tried to pick up some metal shavings, it doesnt hold any residual magnetism. It is about 2-3 mm away from the rotor.

The batteries I have discharged at their c20 down to 12.3v (resting) and then charged one at a time back up to 12.8 (13.10, 12.8 resting) before the run reaches 12.30.

I guess this isnt an exact test as the batteries arent fully discharged, I didnt want to drain them fully yet.

[casman1969]

Finally, some success. Have been using a SSG setup with two opposing bifiler wound ADAMS coils. This setup has given me many opportunities to experiment and with the current setup I am ever so slowly charging the primary battery. No charging battery in ckt. Here's the results: At 11:00 A.M. EST I started with two batteries(24V), the first one started at 11.96 V and the second at 12.21. It is now 14:22 and the first one is now at 11.98 and the second is at 12.23.
I will leave this alone and check in the morning but this is the most promissing response I've seen to date. If it continues on current track I'll post pics tomorrow.

Carl

[casman1969]

came in this morning only to find a broken contact^&*^&$#$##@.
if anyone has a good idea on how to put or make a reliable mechanical contact for my bicycole wheel I'm really open to suggestions. 12 guage house wire breaks with enough movement and that is what happend. Other than that setback I'm still excited about the progress.

Carl

[Thaelin]

   Braided ground wire works. Also, the brushes on street sweepers use SS tines. I use them now and then for switch contacts. Just watch the amps you draw through as they will heat.

thaelin