On Friday 05 March 2010, 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? > Depends on the available power supply. I once saw the AVR-25's (ampex 2" quadruplex video tape machines, state of the art in the 70's) which could go from a stopped head wheel to a sync locked picture in 400 milliseconds, using amplifiers with several hundred volts of headroom for the required 3 phase, 440 hz motor drive. Or it could make pix in 40 milliseconds from a hot, already spinning head wheel. It could at times make the overhead florescent lights blink with its instantaneous power draw of about 25kw for the first 250 milliseconds of the acceleration.
But that head wheel was only 2" in diameter, and only had to get to 14,400 rpms with an angular accuracy at any one instant in the 5 microsecond range from where it was supposed to be in order to make a usable picture.. >--------------------------------------------------------------------------- >--- 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 > -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Simon: "It's okay to leave them to die." --"Serenity" ------------------------------------------------------------------------------ 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
