> On 10/15/22 14:17, andy pugh wrote: > > On Sat, 15 Oct 2022 at 18:02, John Dammeyer <jo...@autoartisans.com> wrote: > >> What would a working STMBL go for nowadays? One can buy servo motor/drive > >> combinations as cheap as > $200 from China although shipping is a bear. > > The STMBL really shines as a retrofit drive, as it can be persuaded to > > work with almost anything. It's also rather nice having digital > > position control via smart-serial. > > > > But given that they don't really exist at the moment, it's difficult > > to recommend them. > > > If you've the time Andy,, some of us would like a history of STMBL, and > why they don't exist today? > > Cheers, Gene Heskett.
Might be past Andy's bedtime now so I'll add my two cents. First check out this web link. https://github.com/rene-dev/stmbl Then read the getting started guide which fills in a lot of the blanks. Now. Why is it not available? Two reasons. The key thing about the STMBL for 3 phase AC servos was that it used single driver for all three windings. Probably originally designed for washing machines. It was discontinued. A different one with slightly lower power was available. There are others but different pinout so board change. It uses two processors. One for the high voltage side and communication with the other one is done optically for full isolation. The main processor does all the interaction with the outside world. The smaller driver processor apparently is currently sitting with a more than 1 year delivery date. That may have changed. Not only is the schematic open source but so is the software. Truly one of the great projects released over the last few years. I have it connected to my harmonic drive which is AC servo based. I never did get it working with the brushed DC motors. Only the STMBL designer appears to have used it with a DC motor and otherwise seems no one else has so support was essentially non-existent. I went back to using the HP_UHU drives until I swapped them out for Bergerda AC Servos. John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
