On Tuesday 09 March 2021 13:38:26 Chris Albertson wrote: > I bought some drivers at Stepper Online to replace some drivers I > bought from Stepper online and the replacements were night and day > better. > > What matters is the model number and design of the driver, not the > reseller. During the years I used the first set of drivers, the > design moved forward and now is 100% digital with very good MOSFETs. > The old drivers caused the motors to make a high-pitched sound. > These old drivers also had large heat sinks on them. The new drivers > are silent and never get warm and don't have heat sinks. Stepper > Online's top-tier drivers are made by Leadshine. None of the on-line > resellers actually make their one stuff, it is all private-labeled. > > The newest thing is closed-loop stepper motors. These are good > because the controller limits the current to only what is needed and > this keeps the motor much cooler and somehow dramatically increases > the motor's performance > Some do John, but so far most don't, and still have the dipswitch to set currant. The cheaper driver for the 1, 2, and 3nm nema 23's is the one to get if that is enough torque, that driver does not have dip setting for current, using the encoders error diff as the current modulator. No detectable heat from the driver and on my Sheldon, maybe a 5 degree rise over room for motor heat. Your power meter will spin slower by quite a bit if heating with gas. I my case it doesn't matter because less motor heat has to be made up by the electric heat. A calorie is a calorie regardless of its src in a closed environment. That garage is way better insulated than this 1974 house. :( I built it that way in 2008. :)
> On Mon, Mar 8, 2021 at 6:52 PM John Dammeyer <[email protected]> wrote: > > I've been using the Bergerda motors for a while now. Brought in a > > couple of 7A stepper motor drives to replace a noisy whining > > stepperonline model. Surprisingly buying two with shipping was only > > $5 each more than the stepperonline through Amazon.ca with free > > Prime shipping and it's a much nicer unit, bigger heatsink, no > > whine. > > > > Last year when I went looking for a VFD and 3 phase motor for my > > mill I rapidly found that an AC servo with the same power rating as > > the 2HP single phase motor was less than a new three phase motor and > > VFD. And buying direct through Alibaba even with shipping got me a > > motor/drive that was cheaper than through EBAY. > > > > Because I've been so positive about their drives and support the > > Bergerda sales people have been asking me who would make a good > > distributor and local supplier for the USA. I'm in Canada and I > > learned a long time ago it's not cost effective to import to here > > and then sell into the USA. > > > > Obviously the products they sell are not meant just for milling > > machines. Just about any automation project that has a need for > > motors would work. > > > > Any suggestions? > > > > Thanks > > John Dammeyer > > > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
