Re: [CAD_CAM_EDM_DRO] Re: Going home / more stepper speed!

>
> Alan,
>
> Hi. A Pittman will do. Actually you don't want it to add load; you
> are trying to measure the behavior of the test motor, not anything
> else. The Kv is definately linear but measure it at a fairly high
> speed. If you drive the DC motor with a variable current source after
> having carefully calculated its Kt, you have the beginings of a
> dynamometer.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> > 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@y... 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