On Saturday 26 December 2020 13:48:29 John Dammeyer wrote: > I looked at prices for a 2HP 3phase and a VFD (like Hitatchi > Vectorless?) and found without shipping the price was approaching > $600. For less than that I ended up with Bergerda. > > I'm using a Bergerda AC Servo 110SM series (1.8kW, 6NM) on my > spindle, currently with a cheap PWM module until I wire up a second > BoB for step/dir control. With PWM I get 100RPM to 3000RPM without a > belt change. With stepper I can have it move very very slowly. > > I also swapped in, for testing, a smaller 60SM series 1.27NM Bergerda > onto the X axis. Once I read the manual correctly I got step and > direction working well. The drive isn't overly large but is a bit > bigger than the HP_UHU which runs the brushed servo motors also 1.2 > NM. This video shows it now working. I can get 180ipm on the X axis > just like the much bigger DC Servo. https://youtu.be/43liAVILgHY > > The Gecko Stepper G213V driver on the knee has now failed for the > second time melting the connector again. Absolutely no response from > Gecko so it's being scrapped and FedEx tracking says my new Bergerda > AC 80SM series servo (3.5NM) will arrive on Wednesday along with 2 > more of the small 60SM units. > > They aren't cheap compared to stepper motors. In my case I get to > remove a complete Toroidal power supply that runs only the stepper but > is big enough for the entire mill with 60VDC motor drivers. > > The DC Servos and Harmonic drive (controlled with STMBL) run on a > 105DC Toroidal power supply. I could remove this and run the Harmonic > off 110VAC to DC with a smaller isolation transformer. Then I'd have > room for the Bergerda drives. This is the MACH3 Road Runner with the > much bigger DC Servos and the 1200 oz-in (drops to 3.5NM at 300RPM) on > the knee. https://youtu.be/OUQzyp-3WXY > > I've found support and price excellent, shipping horrendous. For > example I found that when the spindle stopped it would sometimes sit > with a bit of a squeal. A quick email to Bergerda and discussion and > we figured out which parameters to tweak. Now it's dead quiet. And > much smaller than the single phase 1.5kW 2HP motor. > http://www.autoartisans.com/mill/NewPulleys-1.jpg > > John Dammeyer
Looks pretty good from here, John. You do better finish work than I and its obvious. > > > -----Original Message----- > > From: Dave Cole [mailto:linuxcncro...@gmail.com] > > Sent: December-26-20 9:44 AM > > To: emc-users@lists.sourceforge.net > > Subject: [Emc-users] Chinese VFDs with good reputations > > > > What low cost Chinese drives have you guys used with great success? > > > > I'm talking mostly single phase input drives. > > > > There are a lot of look a likes on Ebay.�� Some are dirt cheap. > > Others not so much. > > > > Some specify that they are specifically for water cooled spindles, > > etc. > > > > Others say almost nothing. > > > > Dave > > > > > > > > _______________________________________________ > > 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 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis 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
