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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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  • 0
    Thanks for your tips!
     
    I tried employing this in two ways:
     
    1) Created two inputs, one for the desired angular velocity (e.g. 3600d/s) and one for the actual (measre of the object's angular velocity) and used their difference as input to a gain block which was then used as input to a Torque. I tried various values for the gain, ranging from 100 to 1e10 (I know its unrealistic as gain but I was just testing the limits).
     
    2) Created two inputs, one for the desired angular velocity (e.g. 3600d) and one for the actual (measre of the object's angular velocity) and used their difference as input to a PID controller block which was then used as input to a Torque. Here I adjusted the P, I and D gains several times which somehow always lead to the same result.
     
    Both ways result in a motion which for some reason never surpasses the 2000ds, regardless of the values I use in the parameters. I used a relatively small step (1e-3) so as not to have too many numerical errors.
     
    If I understand what you told me correctly, then The difference between the actual and desired values should lead to an increase in torque, until the difference approaches zero. However this doesn't seem to be the case. If anything, the difference actually becomes larger as time moves on.
     
    Did I perhaps not understand something you told me correctly?
     
    Thanks,
     
    Josef
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  • 0
    Thanks for your tips!
     
    I tried employing this in two ways:
     
    1) Created two inputs, one for the desired angular velocity (e.g. 3600d/s) and one for the actual (measre of the object's angular velocity) and used their difference as input to a gain block which was then used as input to a Torque. I tried various values for the gain, ranging from 100 to 1e10 (I know its unrealistic as gain but I was just testing the limits).
     
    2) Created two inputs, one for the desired angular velocity (e.g. 3600d) and one for the actual (measre of the object's angular velocity) and used their difference as input to a PID controller block which was then used as input to a Torque. Here I adjusted the P, I and D gains several times which somehow always lead to the same result.
     
    Both ways result in a motion which for some reason never surpasses the 2000ds, regardless of the values I use in the parameters. I used a relatively small step (1e-3) so as not to have too many numerical errors.
     
    If I understand what you told me correctly, then The difference between the actual and desired values should lead to an increase in torque, until the difference approaches zero. However this doesn't seem to be the case. If anything, the difference actually becomes larger as time moves on.
     
    Did I perhaps not understand something you told me correctly?
     
    Thanks,
     
    Josef
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