On Sunday 21 March 2021 17:55:33 ken.stra...@gmail.com wrote: > You mean such as: <https://www.moonsindustries.com/p/nema-17-smooth-hybrid-stepper-motors/17hc2005n-000004611110015028>
First, turn off word wrap or surround the link with <url> as I've done above, make a clickable link out of it. Rather high priced for the torques quoted. > and <https://www.globalsources.com/Three-phase-motor/nema-17-stepper-motor-1180131693p.htm#1180131693> Same comment but much more reasonably priced.> > https://www.mygwek.com/index.php?main_page=product_info&products_id=65 >0125 > Older tech, heats the motor much worse using continuous high currant. This driver is smarter, uses only enough current to get it to where you tell it to go. > What are you using for your driver? Tagged with a sticker from ToAuto called an "LCDA357H" and on ebay, separately: <https://www.ebay.com/itm/Good-price-Nema23-3-Phase-18-50VDC-7A-LCDA357H-closed-loop-stepper-motor-driver/173853481254?hash=item287a799926:g:spcAAOSwvApaElIU> which at $50+12 ship was the only listing w/o a motor, it normally comes with either a 3MN or a 2MN nema 23 motor with an attached encoder for as little as a hundred dollar + ship. I see that listing has a make offer, I'd see if he will take 25/copy. It also has an RJ style RS-232 port I've not hooked up as its speed and capabilities are not divulged in the docs I have. I've bought 2 of the 3NM's and one of the 2NM, and that is what's drive- ing my 11x56 Sheldon now, very quiet, no heat. 2x faster than the bigger nema 34 I originally put on it, and at least 40 db guieter. I am tempted to change its name to Casper, for the ghost. :o) > If you try one please let us know how the 3-phase works! Works way better than 2 phase stuff. I haven't tried them, I am running them till the rapture. It looks like a stepper to the driving card, in this case a Mesa 7i90HD driven by a 3 wire 25 to 40 megabaud SPI to a rpi4b with 2 gigs of dram, Except it has a fault output I've hooked up to motion enable and a batch of 40 amp SSR's to kill all motor power, which also resets the driver if off for enough time to bleed off the psu's. At least 5 or 6 seconds. As its fairly new, for nema 17's I'd see if the 232 port could program it to limit its 4 amp current to something safer for nema 17's. Otherwise it should run a nema 17 that isn't being overworked just fine. A full step is only 1.2 degrees as these are not 200/turn motors, but 300/turn. But thats just a number to LCNC as long as you aren't too fast for the input opto's of the driver. Rated for 200 kiiohertz, I've run them with a function generator at 275 khz, but timing is very critical, as is loading at that speed. Take care & stay well Ken. 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
