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How to compute for the torque developed in the shaft of the motor?

  1. Sep 21, 2008 #1
    How to compute for the torque developed in the shaft of the motor??

    1. The problem statement, all variables and given/known data
    A DC series motor takes 40 A at 220 V and runs at 800 rpm. If the armature nd field resistnces are 0.2 ohm and 0.1 ohm respectively and the iron and friction losses are 0.5 KW. find the torque developed in the shaft of the motor. What will be the output of the motor?


    2. Relevant equations



    3. The attempt at a solution

    What i did was:
    EC= 220-40(.2+.1)
    EC= 208
    Power of the armature= (0.2)(40)^2=320
    power of the field= (.1)(40)^2=160
    Poutput= 8.8K-320-160-.5K
    Poutput= 7820
    7820=(2*pi*800*Torque)/60
    Tout=93.34 Nm

    My problem>> I don't know what's next..

    Is the Friction & Iron Losses same as the SPL of it?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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