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Subject: Re: [OT]: Stepper motor sequence question


> Joan Ilari wrote:
>
> > I have built a 3 wheel rover powered by two unipolar 4 phase
> > stepper motors (one wheel is free). Each motor is controlled
> > (of course!) by a PIC. According to the motor datasheet,
> > the motor stepping sequence should be :
> >
> > A -A / A -B / B -B / B -A
> >

This cannot be right!
A -A, and B -B are both null.
More like A B / A -B / -A -B / -A B
here is a diagram:

      A
  -B     B
     -A

Go CCW in above diagram with 2 phases always on, for CW it's
A B / -A B / -A -B / A -B

Sorry if this is too pedantic!
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