> Declan wrote:
> >What is the handiest/cheapest way of doing this?
>
> >I'm considering a retrI don't yet have great details on the stepper motor
(2
>
> >independent coils). The application is a label printer.
>
I used to control stepper motors using a L6506 and a L298, both from ST. If
you have the time to search the site, there are some application notes. The
L6506 is a current controller for the L298 (a H-bridge), but remember that it
can handle only up to 2 A. For 3 A, if my memory does not fail, there is the
L6203. Remember to put a heat sinker on it - it fries - ...
To control stepper motors, you need to know which are the coils; How many
cables have your motors? Use a simple multimeter to identify the coils -
Common values are a few ohms per coil. Be careful with the connections bridge-
motor.
Then, there is the impedance problem. If the impedances do not match, you
will notice that the motor only moves a few steps in the end of the query
(and sings like a plain). Just add more indutance in series with each coil
(;)).
Hope it helps,
Paul
--
Author: Paulo Castro
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