On 04/23/2014 09:07 AM, Florian Rist wrote: > Hi Jon > >>>> http://www.pico-systems.com/acservo.html >>> Ah, I see that would make thinks much easier. >> You COULD, in theory, run it with just the Direction signal in >> synchronous antiphase mode, but this may cause the >> filter inductors (and maybe the motor, too) to run hot. >> Our servo amp was designed to run in sign-magnitude mode. >> That only takes TWO signals, PWM and Direction. > Hmm, by looking at the 'H-Bridge Secrets' [1] article by Andras Tantos > I think I got an idea what the two different modes of operation are. > (The article is on DC motors, but I seams to be more or less clear what > it means on the phase BLDC drivers.) > > But I don't see how the mode of operation makes a difference regarding > my synchronisation problem. What do I miss? > > Andy Pugh suggested you could run my PWM servo amps with just ONE wire/output pin. That is what I was referring to, and that two wires would be better. With sign/magnitude control, there is no output until the PWM signal has pulses on it (ie. when power is needed to move the motor). With synchronous antiphase, both sides of the full-bridge are cycling at 50% duty cycle all the time, ramping triangle-wave currents through the motor windings.
As for the synchronization part of your question, I didn't have any comment on that. But, I think it might be fairly simple to rig up suitable functions with standard HAL components that can do what you need. Probably there'd be the PID component, but I don't understand the rest of the requirement enough to say more. Jon ------------------------------------------------------------------------------ Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
