2015-03-26 13:55 GMT-03:00 Jon Elson <el...@pico-systems.com>: > I make some "dumb" PWM-controlled servo amps. The PWM duty > cycle is converted to voltage output, not a current (as in a > torque-mode amp) or true velocity (there's no velocity or > current feedback). So, LinuxCNC's PID module is the only > thing between the commanded position and the motor-encoder. > This system is harder to tune, but it does work pretty > well. Velocity is extracted using the velocity estimation > scheme used on many LinuxCNC encoders and fed to the > optional velocity input of the PID ( pid.0.feedback-deriv). >
I just made a post on our improvements using VFDs and AC induction motors as servos. Well tuning is a bit of a pain because but I'm pretty surprised by the way they are behaving. I need to fine tune them, also I need to learn a lot about how to tune them but in the next days I'm going to give it a try to see how I can improve it. -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
