Hi Gene: I considered saying the Sum of the 3 phase currents is zero, except for harmonic distortion and voltage difference, I decided not to complicate the message.
On Sat, Jul 31, 2010 at 12:28 PM, Gene Heskett <[email protected]>wrote: > that 3 phase 440 hz drive to the > headwheel motors was actually 3 separate oscillators whose feedback to > maintain the phase angles between them was mixed with the detected time > base errors in order to speed up the feedback loop and make it stable, each > oscillator then seeing the applied error in real time. > Having watched the world of electronics got from all analog to all digital. I am curious where these drives were in the transition. Do you remember the basics of the circuit to synchronize the phases? No big deal, just curious. Here in Weston, WV, we have > one of those ma & pa ancient mary (AM) radio stations that does an > excellent job of keeping us up to date on such goings on. > I also live on a single feed thirty miles off the power grid in South West VA. We usually get 17.5 flickers before the outage. I run the system computer and electronics through a UPS and hope the joint following errors shut the system off before damage. The spindle and axis servo are direct to the AC power with linear power supplies; which can maintain voltage through small flickers. The shop radio tells me when flickers start (snicker). Thanks Don > -- > Cheers, Gene > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > You two ought to be more careful--your love could drag on for years and > years. > > > ------------------------------------------------------------------------------ > The Palm PDK Hot Apps Program offers developers who use the > Plug-In Development Kit to bring their C/C++ apps to Palm for a share > of $1 Million in cash or HP Products. Visit us here for more details: > http://p.sf.net/sfu/dev2dev-palm > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
