Hello Chris, I might be missing something, but I don't think it's a closed loop motor. They never mention position loop, and I can't see an encoder.
27 трав. 2017 р. 10:56 пп "Chris Albertson" <[email protected]> пише: > Hi, > > Has anyone here experience with this? > > I think these are new. I've seen them on some web sites and also eBay. I > can't find any good engineering information yet, like user manuals or > speed/torque plots but the idea is great. > > They are an integrated closed loop driver/controller and motor. The > feedback loop is done inside the motor. They are MUCH better at holding > torque at high speed than are normal steppers. More like a servo but at > much lower cost. The motor accepts DC power (about 36 volts) and step > and direction. Here is one example from eBay > > Building the driver into the motor is good. For closed loop control the > driver must be matched to the motor so you would always buy them in pairs > anyway. Placing them in one unit saves the need to run a lot of wire and > all the noise problems and lowers the over all cost. The driver cane made > simpler and cheaper because it does not need to be general purpose, it just > drive the motor with known inductance and resistance. > > http://www.ebay.com/itm/Nema23-57BYG-Stepper-Motor-Integrated-Driver..... > <http://www.ebay.com/itm/Nema23-57BYG-Stepper-Motor- > Integrated-Driver-2-in-1-L112mm-3Nm-24-48VDC-CNC/ > 192011640913?_trksid=p2047675.c100005.m1851&_trkparms=aid% > 3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D40130%26meid% > 3Dbc8047bd176346b9a8fbf5703256f1ef%26pid%3D100005%26rk%3D4% > 26rkt%3D6%26sd%3D262565354603> > > I saw a youtube video demo of one of these that showed it holding > position. It was using almost no current and the motor was cool. But then > if you apply force to the shaft the current zooms up to counter the applied > force, like a servo Basically it IS a servo. There is an optical > encoder. The above web page has a block diagram. > > All the good info is in Chinese. Perhaps someone here is good at technical > Chinese. My wife can read only the very basic stuff and Google translation > is not so good. I think these are designed and sold into the Chinese > domestic market hence no US sales office or English technical documents. > > This eBay unit is cheaper than a conventional setup. I think this is the > way things are moving > > > -- > > Chris Albertson > Redondo Beach, California > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
