Why should one care about following error during rapid moves? Such motion is usually only point to point, with accel and decel at the respective ends. Does the FE remain after the motion halts?
----- Original Message ----- From: "Neil Baylis" <neil.bay...@gmail.com> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Saturday, May 08, 2010 15:53 Subject: [Emc-users] Linear motor tuning test >I made a short video of progress in tuning my Linear Motor axis. This is > going to be the Y axis of a laser machine. In the video, it's doing a > series > of random rapids at 30 inches per second, or 1800 IPM. During these > rapids, > the FE is less than 0.05 inches. I'm not done with the tuning yet, but > these > results are encouraging. > > Linear Motor tests <http://www.youtube.com/watch?v=wxwgzj4KmCE> > > The motor is driven by a Pico systems 3 phase PWM amplifier, and the Pico > systems UPC controller. This amp uses 6-step commutation, and initially I > was concerned that there would be too much force ripple. Seems I didn't > have > to worry. > > You can hear two main sounds in the video. The higher pitched scraping > sound > is the sound of the linear bearings. There's also a lower pitched rumble, > which is coming from the motor. This sound seems to be caused by the > Derivative term in the control loop. If I set D to zero, the rumble goes > away, but the FE becomes too great. > > Neil > ------------------------------------------------------------------------------ > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
