Re: [CAD_CAM_EDM_DRO] Re: DC feedback motor

> You can not turn a stepper into a servo motor. You
> can use one of the Camtronics Mauch/Kulaga DRO cards with a stepper,
> encoder, and EMC to have a closed look stepper system, but it is NOT a
> servo.

Actually it is. Servos come in many flavors. The only thing the term
seems to universally denote is a closed-loop actuator system which can
be tightly controlled.

Permanent magnet DC brush motors with a position feedback sensor (and
often a velocity sensor as well) are what many people think of as servos,
but that leaves out a number of other common systems:

...Brushless AC (induction) servos

...Brushless DC servomotors - which need electronic commutation and are
essentially low step-count stepper motors driven in a microstepping
mode.

...Hydraulic servomotors

Of course the G320/340 only drive DC brush servomotors - but other
drives are available for these other servomotor actuator types.

Chris

--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
22 Adrian Street, Somerville, MA 02143
http://www.mdc.net/~stratton
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