>You should forget these and get some 5V 1A or so motors, but for
>other reasons rather than this.
That's exactly what I found in one of my storage boxes in the garage
over the weekend. Found three 5V 1A unipolar steppers that were
hooked up to a board with three UCN5804 drivers. The power supply was
30V and there were 25 ohm high wattage resistors in series with the
coils. A poor man's substitute for chopper drives. Built this around
5 years ago. I'll probably dump these on E-bay someday.
--- In Homebrew_PCBs@yahoogroups.com, Alan King <alan@n...> wrote:
> Robert Hedan wrote:
>
> > Uh, change in plans. I've been fiddling around with the 24V
motors I have
> > on hand and they appear to be VERY demagnetized. I didn't notice
this until
> > I picked up a set of smaller steppers and noticed a drastic
difference in
> > resistance.
> >
>
>
> LOL.. If by 'resistance' you mean cogging, that has nothing to
do with being
> demagnetized. Short all the wires on one of your motors together,
and see if it
> isn't pretty damn hard to turn.
>
> You should forget these and get some 5V 1A or so motors, but for
other
> reasons rather than this.
>
>
> > So now I have to get myself decent steppers. I'm not going back
to the
> > local surplus store, I'll just get the same problem (dozens of
steppers all
> > piled in the same box). I'm going to buy larger motors for the
CNC machine
> > later, but for now, I'm looking for decent intermediate motors
that will
> > make my drilling station work as well as machine wood and
plastics.
> >
>
> They're usually in a can, and even if they weren't just tossing
them in a box
> isn't likely to demagnetize much of anything. They're shipped in
boxes of 50 or
> 100, about as close as just tossed together.
>
>
> > I was checking these pulls from Xylotex:
> > http://www.xylotex.com/DoubleStepper.htm
> >
> > Problem is now I have to reconsider a totally new driver
circuit 'cause
> > these are bipolar steppers. Can I modify my schematic without
TOO much
> > trouble? Or am I better using a new design?
> >
>
> Probably better to find some good solid 5V unipolar motors and
get using them
> until you've learned a bit more about steppers in general. Some of
it simply
> comes from getting and using all types, start simple.
>
> Alan