A friend of mine has run hydraulics that way. What you say makes a lot of sense for the model trains too. My little PWM DC speed controller was set above 20kHz to prevent audible noise. But that's a lot different from 60Hz that would, as you say, introduce vibration to overcome static friction but not have the motor over speed with kinetic friction. John
> -----Original Message----- > From: Thaddeus Waldner [mailto:thadw...@gmail.com] > Sent: April-10-22 8:31 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Controlling DC motors. > > This idea is still in use today with proportional hydraulic valves; you use a > PWM frequency that is low enough to induce a slight > continuous vibration in the valve, to overcome stiction. > > > On Apr 10, 2022, at 6:49 PM, Chris Albertson <albertson.ch...@gmail.com> > > wrote: > > > > I'd say this thing was a vibrator with a DC component and not PWM control. > > > > > _______________________________________________ > 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
