RE: [CAD_CAM_EDM_DRO] Re: DC feedback motor

I was thinking as I was typing that someone would point out that a stepper
motor is not very far removed from a brushless servo motor. I guess that my
major point is that while a closed loop stepper could be technically
consider a servo (a closed loop positioning system that involves negative
feedback) it does not give it the positive characteristics that most of us
are wanting out of a servo system.

Second point is it will not work with a G3X0 driver.

Tim
[Denver, CO]

> -----Original Message-----
> > 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