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Homework Help: Finding motor line current and induced e.m.f?

  1. Feb 26, 2013 #1
    1. A 400 V, 10 HP, 3-phase synchronous motor has negligible armature resistance and a synchronous reactance of 10 Ω/phase. The motor runs at unity power factor. Determine the motor line current and the corresponding induced e.m.f for full-load conditions. The efficiency of the motor is 85%

    2. P=[itex]\sqrt{3}[/itex] VI

    EGP (unity) = [itex]\sqrt{ (V+IR)^2 + (IX)^2}[/itex]

    3. I tried isolating for current using the first formula then used that value in the second formula but got the wrong answer.
    The correct answer is supposed to be EGP= 263.5 angle=-28.7 degrees. Please help guys :(
  2. jcsd
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