Pulse motor and timing

[dracozny]

i have used 12v reed switches before they are available from radioshack (asuming they still sell that stuff i bought mine a couple years back)

[Thaelin]

  What I use is a N.O.  with a 680 ohm resistor. In use I think that might be not
quite enough. After a while the reed starts sticking closed and then I have to
get another one.  Since I am using 6 of them, that gets out of hand quite quick.

   I tested my Hall coils and found max of .25 volts so that means I have to use
smaller wire and more of it. Big enough now to get in the way. May just eat it
and use a small transistor to trigger the bigger one. More current used but a
heck of a lot less coil size.

   I see in Bedeni's design he puts it right over the top of the pulse coil. I have
to say I would have timing issues with this. No way to tweak the power spot at
all. I want to make sure all pulsers are fireing at the same level so to produce
as much power as I can.

   My motor runs on 24v in the end even tho I am testing it at 12v.
   Thanks all. Another step closer.

sugra

[Thaelin]

   While at work last nite I got to wondering about optics. On the machine I run it has a timing
bar that runs full length. On both ends it has a chopper wheel and two sensors to make sure
both ends are running. They are really nothing but an optical transistor and a led which could
be used in place of the hall coil. A small wheel with alternate black and reflective surface would
create the switching pulses. Being optic, it would have no problem operating in the magnetic
fields and leaving the extra coil space for the charging circuit.
   Have a led on the output of the optic you could be sure it is working as well. Hope this is useful
to someone here. Think it will cure most of my ills for the moment. Chow

Sugra


   

[Thaelin]

   Just finished my first test of the optics and found that an NTE3032 will directly fire the
3055 and give about a 1 amp draw with fair light. Looks like the end to the reed relay
problem. Much easier to get to work and I have used an old compact disc with tape on
it to reflect the light. Not sure how big of a window to make just yet but experimentation
will tell.  It sure could do with a bit of balance tho, call it shakey pete right now. 

Sugra

[zott]

I have just found this site and am having timing probs I think  I  just get the rotor spinning and lose a couple of nte 331 trns's  every time  .Am using 3- 5 wire coils against 6 ceram mags . I just get her up and 2 or more transistors superheat  and stay closed  I have burnt through  27 trans's and am in process of going heavier.