Przemek Klosowski wrote: > On Wed, Mar 3, 2010 at 1:36 PM, Jon Elson <el...@pico-systems.com> wrote: > >> encoders. He was accelerating at something like 10000 rad/sec^2, >> > > Holy cow, that's from zero to 100,000 RPM in one second. Can you say what is > the application, what power, etc? Is it even realistic? > Well, he wasn't going to 100K RPM, but he wanted to go from zero to several thousand RPM in just milliseconds. Yes, it is realistic, and there are actual needs for such stuff. The one I'm familiar with was the old 1/2" computer tape drives. They had to run at constant speed during reading or writing, and the gap between data blocks should be kept as short as possible. So, they had to accelerate from zero to 100 inches/second or more in a few ms. Very light ironless rotor motors were used. The armature was just a bobbin "woven" with wire, with a solid steel slug in the center that didn't rotate. Shafts were often ceramic, the tape capstan was either magnesium or fiber composite.
But, I think trying to do this on a Taig mill with it's tiny leadscrews was not a realistic choice. The motors are Keling size 23 brushless motors, the servo amps are Pico Systems brushless PWM amps. I did not understand the "application" other than it was a university reasearch project. Jon ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
