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
