Yes, that is true :-), But if you make some ~1000 microsteps on a stepper, you will start to notice that no more is a "step" in question, but rather an increase in torque, or pressure and that the accuracy dropped down in load conditions... So, in smaller machines, where only slow speeds are planned, with low load per revolution a deeply microstepped stepper is just adequate, but no way it can replace a 2kW 3-phase motor if on the NC machine was used such previously.
On the speed servo... it needs to have some well-tuned pulsed power system, because motors simply don't move at voltages of ~0.1V :-), well, maybe except BDLC motors, which are already purely electronic drive. > > > Of course conditions will vary. The machine in question is a big > servo-controlled > milling machine, and axis speeds of several hundred IPM are planned. The OP > was asking what the minimum speeds might be without motion breaking down > into > discrete steps. If ONLY such low speeds were being planned, a huge > servo would not > make sense. > > Jon > > ------------------------------------------------------------------------- ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
