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Found core loss equation, please explain

  1. Jun 25, 2010 #1
    this is the formula for calculating core loss
    http://power.thayer.dartmouth.edu/pictures/function.jpg [Broken]
    alpha, beta and k are constants that have to do with the material of the core. what are f and B, and what exactly does Pcore mean
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 25, 2010 #2

    dlgoff

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    f is the frequency and B is the maximum applied magnetic field. The equation is a model of hysteresis loss.

    http://hyperphysics.phy-astr.gsu.edu/hbase/solids/hyst.html" [Broken]
     
    Last edited by a moderator: May 4, 2017
  4. Jul 1, 2010 #3
    Excuse me, but:

    1- B is maximum flux density
    2- That formula related to complex losses due to hysteresis and eddy current losses.

    Indeed the components of core loss can be represented by the expressions below:

    Hysteresis loss,

    Wh = k1.f.Bnmax watts/kg

    and Eddy current loss,

    We = k2.f2t2B2eff / ρ watts/kg

    where k1 and k2 are constants for the material
    f is frequency, Hz
    t is thickness of the material, mm
    ρ is the resistivity of the material
    Bmax is maximum flux density, T
    Beff is the flux density corresponding to the r.m.s. value of the applied voltage
    n is the ‘Steinmetz exponent’ which is a function of the material. Originally this was taken as 1.6 but with modern materials and higher flux densities n can vary from 1.6 to 2.5 or higher.


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