> ... > > 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
I made my own driver cards with closed loop controller. With my driver control loop could be run once for each switch which is equal to twice the switching period. I think it make a lot of sense to build like this. > 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. To build driver into motor may be a problem for heat dissipation. To match motor is usually done with a set of parameters. Placing them in one unit may increase price for internal power supply and other common parts but decrease cost for angular sensor. It is good for seller because they could sell more, both card and motor. ------------------------------------------------------------------------------ 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
