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


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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