Gentlemen, The ultimate goal is simplification. When I am tuning a servo system I am not tuning the motor as much as I am tuning the already tuned servo/motor system. This piles tuning upon tuning and seems more complicated than it needs to be. I am trying to dumb down the drive so the LinuxCNC tuning is directly effecting the motor motion instead of manipulating the tuned servo system. I would like a simple dumb amplifier to send current to the motor and allow LinuxCNC to close the loop and be in full control. The motors on my machines are large so I would need a large capacity amplifier. This seems to me to be the simplest set up. thanks Stuart
On Thu, Mar 28, 2013 at 10:17 AM, dave <dengv...@charter.net> wrote: > On Thu, 2013-03-28 at 07:05 -0500, Stuart Stevenson wrote: > > Gentlemen, > > > > <snip> > > Everyone says the drive/motor servo tuning is the best but if that is > > the case why is there tuning capability in LinuxCNC? Obviously, it is > > not good enough or no effort would be expended in making it better. > > I will try this on one of my systems. > > Maybe I need to work on a pseudo tach feedback that I generate to get > > the desired result. > > thanks > > Stuart > > > > <snip> > > > > > Hi Stuart, > It is not that no one has ever tried to make an auto-tune for linuxcnc. > The problem is non-trivial. There was an alternative pid module but I > could never get it to work. At one time a visiting scientist at NIST did > some work on tuning. It worked about as well as a reasonable skilled > human in tuning. However, the guy left before getting it documented and > it just disappeared. > > If I had the skills to program it I'd try very short tests with randomly > picked sets of parameters with the idea that one would get something > usable and then refine from there. (Monte Carlo) > > A Bode plot would be nice but still one needs a way to get from that to > the correct parameters for a tuned machine. > > Google searching yields many hits but most are buried behind $$ to IEEE > for a copy. > > Many years ago JMK was working on a hal procedure for tuning but got > stalled probably by available time. :-( > > HTH > > Dave > > > > > ------------------------------------------------------------------------------ > > Own the Future-Intel® Level Up Game Demo Contest 2013 > > Rise to greatness in Intel's independent game demo contest. > > Compete for recognition, cash, and the chance to get your game > > on Steam. $5K grand prize plus 10 genre and skill prizes. > > Submit your demo by 6/6/13. > > http://p.sf.net/sfu/intel_levelupd2d > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > > -- > > dos centavos > > > > > ------------------------------------------------------------------------------ > Own the Future-Intel® Level Up Game Demo Contest 2013 > Rise to greatness in Intel's independent game demo contest. > Compete for recognition, cash, and the chance to get your game > on Steam. $5K grand prize plus 10 genre and skill prizes. > Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- dos centavos ------------------------------------------------------------------------------ Own the Future-Intel® Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
