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 > -----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
