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Calculating magnetomotive force in a transformer

  1. Jul 24, 2009 #1
    If I have a transformer with a known primary inductance and number of turns, and the output is open circuited, how would I go about calculating the magnetomotive force created by the magnetizing current?
     
  2. jcsd
  3. Jul 24, 2009 #2
    You can determine the B field in the transformer by equating the engineering and physics version of the stored energy:
    (1/2) L I2 = (1/2) ∫ B H dV

    where L = inductance, I = current, B = u u0 H, B=Tesla, H=amp-turns per meter, V = integral over volume of iron, u = relative permeability, u0 = 4 pi x 10-7 Henrys per meter..

    ∂ ∫ ∏ ∑
     
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