On Sun, 25 Jul 2010 13:57:04 -0500 Jon Elson <el...@pico-systems.com> wrote: > Cathrine Hribar wrote: >> >> On Sat, 24 Jul 2010 23:18:28 -0400 >> Gene Heskett <gene.hesk...@gmail.com> >> >> .> No. This sounds like a simple answer, but is really a "you can't even > begin to compare the two types". > A stepper motor produces the greatest torque at standstill, torque falls > off linearly as speed increases. > A servo motor produces rated torque up to its maximum speed. That's why > a stepper can be rated for 100 Watts shaft output, while a > similarly-sized brush or brushless motor can be rated for 400+ Watts. > The stepper draws current even when standing still, which is just a big > waste. The servo only draws current when delivering power to a load. > > Another problem with steppers is that they cannot run fast or they > overheat. A typical servo motor can be run at 2000 RPM all day with no > problem. A typical stepper will burn out if the shaft is spun at 1000 > RPM, with no electrical connection at all. The magnetics induces iron > losses in the motor and it gets hot. This may happen in as little as 20 > minutes! > > Jon
Hi Jon: thanks for the info on steppers / servos. would u know of anyone who has a used servo amp for sale, I have a servo I picked up locally and would like to experiment with it. thanks Bill > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
