RE: [CAD_CAM_EDM_DRO] Question about Servo Drives

Ah. To answer my own question, http://www.bdmicro.com/rx50/rx50.pdf
has a write-up on the difference between locked antiphase verses
sign-magnitude control. I assume locked antiphase is the same as
synchronous-antiphase?

I had no idea there were so many differences in H-Bridge DC Servo motor
control.

So for a lathe that may at some point be used with MACH3 but for now
will be used with the Electronic Lead Screw with step/dir outputs for
both Z and X, how does one decide what sort of Servo system to install?

John Dammeyer


Automation Artisans Inc.
http://www.autoartisans.com
Ph. 1 250 544 4950

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of John Dammeyer
> Sent: Friday, August 31, 2007 2:31 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Question about Servo Drives
>
>
> Hi Jon,
>
> > Also, this is yet another synchronous-antiphase drive, which is
> > hard on the motor, especially if it is low inductance. Adding
> > an L-C output filter would help reduce current ripple, but it
> > makes the above problem worse, of course.
> >
>
> What is a "synchronous-antiphase drive" as opposed to some
> other type of
> drive? How is it hard on the motor?
>
> > I don't want to explain too much further or I'll be revealing my
> > own trade secrets.
> >
> > Jon
>
>
> I can understand that. Whatever info you can provide would
> certainly be
> interesting. The down side of the UHU-Servo is that the source code
> isn't available. Seems like a lot of these publicly
> developed projects
> tend to go that way. Lots of input and then finally hardware but no
> software.
>
> I'm playing around with the UHU-Servo so I can try a servo
> drive on the
> Electronic Lead Screw (ELS) project which will have full disclosure of
> software, PCB layout and schematics. Undoubtedly some will use that
> software for commercial projects without permission even though it's
> licensed under GNU.
>
> John Dammeyer
>
>
>
>
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