For servo drivers, one cheap alternative to professional controls is this DIY open-source drive, and work with step/dir pulses like stepper drive :
http://www.max-mod-shop.com/index.php?option=com_content&view=article&id=52:yapscv1&catid=17:-yapsc&Itemid=4 Le lundi 22 novembre 2010 à 11:26 +0000, Andy Pugh a écrit : > 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) > ------------------------------------------------------------------------------ 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
