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Motor torque requirements

Josef K.
Hello,
 
I am trying to estimate the torqie required to drive a lead screw. To do this, so far I 've been using a motion instead of the torque and then viewing the required torque to produce said motino throught the ppt. This doesn't seem to be the correct way though as the results I am getting seem completely off.
 
Is there a more standard way to do this?
 
Thanks,
 
Josef K.
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    As Chris says, friction and flexibility can produce very high, spiky torques in a motion. I usually don't use this method, more than to get a first estimate. A motion is a kinematic constraint and will produce whatever torque is required, with no limit, to produce the motion you ask for.
    Do your run, plot the torque (from a measure or request in the correct coordinates), then filter it to get an average value.
    Now remove the motion and create a SForce torque driven by a PID controller instead. You can get initial parameters from the filtered curve from the motion.
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  • 0
    As Chris says, friction and flexibility can produce very high, spiky torques in a motion. I usually don't use this method, more than to get a first estimate. A motion is a kinematic constraint and will produce whatever torque is required, with no limit, to produce the motion you ask for.
    Do your run, plot the torque (from a measure or request in the correct coordinates), then filter it to get an average value.
    Now remove the motion and create a SForce torque driven by a PID controller instead. You can get initial parameters from the filtered curve from the motion.
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