On Fri, 18 Mar 2016 18:21:45 -0400 John Kasunich <jmkasun...@fastmail.fm> wrote:
> > > On Fri, Mar 18, 2016, at 05:18 PM, Nicklas Karlsson wrote: > > > > Stepper motor magnets induce a voltage proportional to speed which limit > > maximum speed. > > Torque is about the same regardless of speed and there are some intertia. > > > > Torque is not even remotely the same regardless of speed. > Above a certain base speed (usually well below max speed), a stepper > motor is more constant-power than constant-torque, so the torque > drops off inversely with the speed. Constant power happens with other motors during flux weakening and also make sense. The torque characteristic is important then selecting acceleration. In *ini file there are MAX_VELOCITY and MAX_ACCELERATION variables. This is interesting because if motors with flux weakening is used for axis it will not be possible to use full torque at low speed or there might be following errors at high speed then enough torque is not available. Nicklas Karlsson ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
