Jon, Will your amps handle the motors on my Cinci? thanks Stuart On Thu, Mar 28, 2013 at 11:10 AM, Jon Elson <el...@pico-systems.com> wrote:
> Stuart Stevenson wrote: > > I ask this because I want to remove the drive tuning from the system. > > 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. > > > There are three ways I know of to run this type of servo. One is > velocity mode, > with either a real tach or a synthetic tach derived from the encoder. > Another is > torque mode, where the tach is left out and the outermost error amp > (velocity > error amp) is omitted. In some units, the command is then sent in > through the tach > inputs, as the velocity amp is disabled or disconnected. In this mode, > the only > error amp in the servo amplifier is the current or torque error amp. So, > the command from the CNC control is a request for motor current. In the > old days > of very limited encoder resolution, torque mode may not have given as stiff > or smooth a system response. > > The last way I know is voltage mode, which is how my PWM servo amps > work. The command from the CNC control delivers voltage to the motor > proportional to the command. These are less stable than torque mode, > but with > a high enough resolution encoder can also work quite well. The velocity > estimation from timestamping encoder counts and feeding thisinto the > newer PID > velocity input helps quite a bit. > > Jon > > > ------------------------------------------------------------------------------ > 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
