Re: Going home / more stepper speed!

Nice idea Mariss,

Like a pitmann (pittman ?) motor? It would also provide some load. Is
Kv linear? So I could empirically determine the voltage at some known
stepping rate (function/rate generator), and "calibrate" my motor? And
add your dynamic brake circuitry? I like that!

Alan KM6VV


mariss92705@... wrote:

>
> You can also couple a small DC brush motor to the step motor shaft,
> place the scope probes across the DC motor, set coupling to AC and
> watch the dynamic behavior of the step motor directly. If you know
> the DC motor's Kv, then you can make quantifiable measurements as
> well.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., Jon Elson <jmelson@a...> wrote:
> >
> > You can, indeed! The motors have a magnet moving past a coil of
> > wire, so any movement of that magnet will induce a voltage (or
> current)
> > in the coils.
> >
> > The current pulses from the stepper driver will swamp these smaller
> signals,
> > but with proper triggering techniques on the scope, you can see
> these ringing
> > waveforms. You can probably evaluate damping techniques and find
> the
> > resonance peaks this way, too.
> >
> > Jon