Jon Elson <el...@...> writes:
> > > What servo drives are you using? I am using Advanced Motion pwm brush type amplifiers. See here: http://www.a-m-c.com/download/datasheet/30a20ac.pdf snip... > > This problem has been bugging me for some time, and I am planning to > work on it at the EMC Fest in May in Wichita. My general plan would be > to put in a fairly simple digital notch filter at 1/2 the sample rate. > Maybe somebody well versed in control theory can expound on the > implications of this, and whether it would be better to have a sharp > notch or a more gradual rolloff starting a little below 1/2 f. > > Buzzing at rest may be eliminated by adding a little deadband. > Depending on encoder resolution, a deadband equal to a couple encoder > counts will often stop the oscillations entirely, or make them sporadic. > > Jon Wow... thanks Jon. I may have to re-read this several times until it sinks in. I will try setting the servo-thread rate higher and see how it reacts. Increasing deadband works from experience, but I will have to do some test cuts and see if following error is tolerable. Tom ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
