On Friday 19 October 2018 22:36:43 Dave Cole wrote: > Here is one I remember. > > http://www.rentanadviser.com/en/pid-fuzzy-logic/pid-fuzzy-logic.aspx > > There is also a lot of developed open source Fuzzy logic libraries. > > Do a search for "Fuzzy Logic Open Source". > > Like everything else, some of it is good, some of it is garbage. > > Faster than a PID? I don't know if it can be faster, but done right, > I think it can be more effective than a PID. Especially if you really > need something more sophisticated than a simple PID loop. > I haven't so far.
> Normally for a PID, you will have a PV(Process variable) and a > Setpoint for the PV and math is run that creates an Output that > affects the PV, hence the "loop". Looking at the math in the first goggle hit, lots of it, although its all integer, seems like it would have to be slower. A PID, since I put the new encoder on the G0704, is good enough that my only clue its overloaded, is the motor's chirp from Jons pwm-servo amp as it goes into current limiting at about 17 amps. Up to that point, no detectable slowdown. I figure I'm pulling around 2hp at that point, its a 1hp 90 volt motor with a nameplate amps in the middle 9's, and its being hammered with 126 volts and nearly double the amps. And working like it was made for it. Knocking on wood, even the plastic gears in the 2 speed head are holding up well. I've even put in some extra hal trickery for a seemless gear change while its turning, as the tally switches also are tied into the drive so that if both are open, the motor revs drop to about 30 while the shifter is moving, and returns to the set speed as the knob hits the last 2 degrees of the stop closeing one of the switches. With that encoder and the PID setup, the speed changes are done in a few milliseconds, way faster than I can muscle the knob. That also is tied to the tach, so the tach is accurate in either gear. But I'm always curious about what may be a better way, Thanks Dave. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
