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
