Hi Jon, Last year I bought a stepper motor driver off Amazon that had an annoying whine. And it was one of the more popular brands. Couldn't stand it.
I contacted Bergerda in China, who's servos and drives I now use, and asked if their stepper drivers had the same problem since the outside of the box looked the same. Got an interesting response about companies that copy and resell at much lower costs over there. So since I wanted a new servo for the knee motor on my mill I had him also include a couple of stepper drives. And yes, the inside of the box is dramatically different. Now that's the steppers of course. The servo drives from Bergerda do not make the motors I have whine. They claim that many of the cheaper motor/drive combinations also cut corners on things like encoders. Donald Chen at Bergerda told me they use the more expensive Japanese encoders. So I pulled a motor apart and looked up some numbers and did some googling. Sure enough they are Japanese products but made in China. So Donald wasn't stretching the truth there. I've been so impressed with both the support and the quality of the Bergerda drives and motors that now my mill is running with those instead of HP_UHU DC Servos and Gecko driven Stepper motors. The only other drive I have is a STMBL open source drive for the Harmonic Drive. I bought my boards from Andy and finished the assembly here. It's an open source project with reasonable support but not completely turn key. My harmonic drive also doesn't whine. Depending on voltage an current requirements the STMBL might just be the best solution for you. I'm sure Andy can provide much more detail on how well they work. John > -----Original Message----- > From: Jon Elson [mailto:el...@pico-systems.com] > Sent: July-02-22 10:36 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] R2E3 retrofit > > Well, now that I have all 3 servo amps connected to motors, > the whine is quite loud, and closing the cabinet makes > little difference.� My ear protectors are designed not to > cut voice frequencies, so the 5 KHz goes right through > them!� Ugh, they have got to go.� I have verified that all 3 > of them work, so I ought to be able to sell them on eBay.� > The X axis is pretty well stuck, only the ballscrew is > strong enough to move it.� I guess I will have to loosen the > gibs and try to lift and slide it off.� Then, I'll be able > to get into the lube orifices. > > So, a bit more of a job to retrofit than I had been hoping > for. Of course, depending on 40+ year old servo amps to keep > on working may not have been a great plan, anyway.� I > ordered an AMC 30A20 servo amp (30 A peak, 200 V max) on > eBay, but I only found one at a reasonable price.� Anybody > know where to look for servo amps? HGR didn't seem to have > much, but maybe I was using the wrong search terms. > > Thanks, > > Jon > > > > _______________________________________________ > 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
