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