RE: [CAD_CAM_EDM_DRO] Servo Hum (Was: Two Q's...)

A machine I worked on had a 50hz oscillation. This would heat the (Hall
effect) motor so fast that the belt would blister in two seconds. Our
solution was tighten the belt really tight to load the motor. Software's
solution was to put a 50hz filter in the DSP. Since it was osciallating
at 50hz, and they added a 50hz filter, the DSP couldn't see that the
motor was osciallating.

We ran it with a tight belt until the machine was retired.

Regards,
JJ

Be Kind, Be Careful, Be Yourself

Edited:

> > If these motors are sitting loose on the bench you may just be
> hearing
> > some standing wave sort of rattle. This can happen with loose
> motors
> > that have very low inertial loads.
> Bascailly, the hum starts at a specific RPM (almost like a switch,
> one second quiet, and the next humming). I could make the hum start
> at a lower RPM by loading the motor with my fingers.
> For reference, can mistuning the servodrive result in a stituation
> that will damage the motor or the servodrive itself?