Roman Black wrote:
>
> It's a standard 4-wire bipolar stepper.
> You can drive it easily with a dual h-bridge
> like the L293 from Allegro.
> Search the net for "jones on steppers"
> Also one of my favorite appnotes is from
> Allegro and is better written and more accessible
> than jones, it is; STP 97-5A technical paper,
> and the first few pages contain the best
> description on stepping motors and the different
> driver types I have ever read.
> :o)
> -Roman

Even better/more/additional info is available here:

http://www.njr.co.jp/_efr005.htm

This was formerly Ericsson's chips but was sold to New Japan Radio Co

regards
/Sten
>
> Graham wrote:
> >
> > I have been stripping old steppers out of disk drives...old ones, straight
> > forward to find what is going on with 5/6 wires
> >
> > recently I got started on some newer 3.5 inch types..
> >
> > these have some *very* small head steppers, unmarked, that look good for
> > making a miniature desktop mobile platform...these motors have only 4
> > connections, the PCB connector is marked A, bar A, B, bar B
> >
> > a quick 2 minute test shows: A+_A gives a step one way, B+_B a step the
> > other, then reversing polarity does the opposite in each case, so looks like
> > these need alternate step+alternate polarity......
> >
> > before I go to greater lengths am I correct or wrong ???
> >
> > if wrong, anyone know what the correct control procedure is
> > if right, anyone written up, or found on the web, the various stepping
> > sequencies to save me re-doing it.
> >
> > A pointer/link to a full spec document on 4 wire (polarity reversal ?)
> > steppers of this nature would be perfect....they are driven directly from a
> > Sony controller so looks like perhaps very low current ?.....
> >
> > Graham
> >
> > -Need *high IP3* AND good N/F ?? try this- http://www.rfham.com
> >
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