.Modelica.Magnetic.FluxTubes.Material.SoftMagnetic.mu_rApprox

Information

The relative permeability mu_r as a function of flux density B for all soft magnetic materials currently included in this library is approximated with the following function [Ro00]:

Two of the five parameters of this equation have a physical meaning, namely the initial relative permeability mu_i at B=0 and the magnetic flux density at maximum permeability B_myMax. B_N is the flux density normalized to latter parameter.

Interface

function mu_rApprox
  extends Modelica.Icons.Function;
  input Modelica.SIunits.MagneticFluxDensity B "Flux density in ferromagnetic flux tube element";
  input Modelica.SIunits.RelativePermeability mu_i "Initial relative permeability at B=0";
  input Modelica.SIunits.MagneticFluxDensity B_myMax "Flux density at maximum relative permeability";
  input Real c_a "Coefficient of approximation function";
  input Real c_b "Coefficient of approximation function";
  input Real n "Exponent of approximation function";
  output Modelica.SIunits.RelativePermeability mu_r "Relative magnetic permeability of ferromagnetic flux tube element";
end mu_rApprox;