Re: DC motor as replacement for Stepper motor

Smoke,

This might help. The motor is driven to the "beat" of the
encoders' "drum". In other words, the encoder is setting the target,
to which the motor position is driven...

It's really just a "which came first, chicken or egg" thing. You can
think of moving the motor, THEN checking the position with the
encoder.
Or you can think of checking the encoders current position, THEN
moving the motor if it is not where we want to be.

We drive the motor 'til it "matches" the encoder. Or we drive the
encoder with the motor, until the position indicated is what we want.

Either way we look at it, we are attempting to remove the error
between "reported" position, and "desired" position. At up to many
thousands of times per second.

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Smoke" <smoke@t...> wrote:
> It sounds to me like your driving the encoder, not the motor.
>
> So with the encoder mounted on the end of the drive screw, how does
the
> encoder drive the motor?
>
>
> > Smoke wrote:
> >
> > > As I understood the question, Ramel asked about using a DC
motor as a
> > > stepper motor, not as a servo motor. Correct me if I'm wrong
but I
> don't
> > > think you could use a DC motor as a stepper motor.
> >
> > With the Gecko 320/340 drives and an encoder on the motor, it
will do
> > everything a stepper will do, only better. The Gecko 320/340
series
> counts
> > step pulses from the computer, and compares the count to the
position
> > indicated by the encoder. it applies power to the motor to make
the
> > encoder follow the step pulses coming from the computer.
> >
> > Jon
> >
> >