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What is external torque?

  1. Apr 8, 2014 #1
    is there any difference between external torque and torque?
  2. jcsd
  3. Apr 9, 2014 #2
    Motor control engineer here (so my answer is not really physics-based):

    Torque - EM torque developed by an electric machine
    External torque - torque imposed by load (positive - generators such as gas/wind, negative - fans, compressors, etc.)
  4. Apr 10, 2014 #3


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    Science Advisor

    Draw a free body diagram. If the force producing the torque is external to a circle drawn around the body, the the force and its torque are external.
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