Re: dc spindle motor control.

I picked up a 500 watt reostat to control this manually. Is the
lowering of field voltage goint to produce the increase in speed I
want? What type of control would you suggest? Do you think it
possible the fields run off the 3rd wire from the armature?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> jeff35m_73068 wrote:
>
> >LOL thats a good one.
> >But seriously I don't think this is a shunt motor. There are
sparks
> >from the brshes and small amounts of continueous smoke when
connected
> >as a shunt. The field resistance is .013 ohms.
> >
> There's your answer. It clearly is a series motor. You need a
closed-loop
> controller with a tachometer for the spindle to hold anything like
a
> constant
> speed. Without it, it would not be unusual for the spindle to slow
down 3:1
> under load!
>
> Jon