On 22 November 2010 10:50, Spiderdab <77...@tiscali.it> wrote: > i would like to know if you know about nema23 motors (either stepper or > servo) with more (kind of double..) torque.
They do exist but might not give you the advantage you expect. My limited experience is that the bigger motors become rather slow, in that the torque drops off more rapidly with speed than the smaller motors, and you are then into an area of diminishing returns. You might be better reducing the drum diameter and increasing the drive voltage. This will give you more wire tension and the higher voltage should allow you to run the motors faster. This might need new stepper drivers and power suppliesas I am talking about probably going to 60 or 70V. For this sort of high-speed work I think that servos are almost certainly a better choice, however they are not especially cheap. If you do go with a servo system then I would strongly suggest looking at the drives from Pico and Mesa which offload all the computational work to the PC and EMC2. This will be both cheaper and more satisfactory. http://pico-systems.com/motion.html http://www.mesanet.com (of particular interest will be the 7i39 and 8i20) -- atp ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
