Re: [CAD_CAM_EDM_DRO] Re: Servo amp connections needed. Where should I go from here?

On Tue, 29 Jan 2002 06:46:29 -0000, "sleyed" <Sleyed@...> wrote:

> There is no tach on the motor I am using.This is a mishmash of
>parts.I was trying to simulate the tach input at the same time as the
>signal hoping it would null out somewhere near zero volts on each
>input. It may be a case where I need a slight negative to null it.

You can not have a speed servo with out some sort of feedback
proportional to the motors speed. A servo controller in the traditional
sense is a feed back control loop. Eliminating the feedback means it
isn't a servo any more. Simulating a tach signal that isn't derived
from some signal proportional to rpm will result in a runaway servo. It
will go to max, or min, but it will "not" regulate to a constant set
speed in response to load fluctuations.

Fitch