Re: These servo motors worth a darn?

> This machine has some sort of feedback from the motor. Has to (unless
> it's a stepper system). The purpose of the linear encoder is to track
> actual postiion regardless of backlash or lead screw pitch error.
> While I understand drives and motors should matched to the loads, my
> concern has nothing to do with that issue. My question has to do with
> introducing a potentially flexible link between the motor and the
> encoder that is tracking the motor. Yes, I understand modern belts flex
> very little, but there is some. Does this pose a problem, is the
> question.

Well it should be possible to somehow design a servo system that would
look at two encoders, one on the screw (or a linear) and one on the
motor. Or put an encoder on the screw and the tachometer (which is
often seperate rather than numerically dervied from the encoder) on
the motor.

Chris

--
Christopher C. Stratton, stratton@...
Engineer, Instrument Maker & Horn Player
(978)538-5179 work, (617)492-3358 home
30 Griswold Street Cambridge, MA 02138
http://www.mdc.net/~stratton