RE: [CAD_CAM_EDM_DRO] Re: Question on Power Supply - regulated notes - motor information

Hi Dave,

That's true, but we also have the condition of running out of product (what
we're pumping), I'd thought of monitoring the current, but that changes the
load on the pump as well! We drive the motors PWM with a PIC.

Alan KM6VV

> -----Original Message-----
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
> Subject: [CAD_CAM_EDM_DRO] Re: Question on Power Supply - regulated notes
> - motor information
>
>
> >
> > I thought it was a cute trick to be able to determine and control
> the pump
> > speed WITHOUT a tach or feedback device.
> >
> > Alan KM6VV
>
> A variable speed drive will manipulate the voltage and frequency of a
> motor, and by monitoring current and voltage a well as other things on
> the power line, one can pretty much tell more than you might imagine
> on a motor.. AND... the thing it is driving.
>
> Dave
>