model CoaxCylindersEndFaces "Leakage flux between the end planes of a inner solid cylinder and a coaxial outer hollow cylinder"
extends FluxTubes.Interfaces.PartialLeakage;
parameter SI.Radius r_0 = 0.01 "Radius of inner solid cylinder"
annotation (Dialog(
group = "Parameters",
groupImage = "modelica://Modelica/Resources/Images/Magnetic/FluxTubes/Shapes/Leakage/CoaxCylindersEndFaces.png"));
parameter SI.Radius r_1 = 0.017 "Inner radius of outer hollow cylinder";
parameter SI.Radius r_2 = 0.02 "Outer radius of outer hollow cylinder";
final parameter SI.Distance l_g = r_1 - r_0 "Radial gap length between both cylinders";
final parameter SI.Length t = r_2 - r_1 "Radial thickness of outer hollow cylinder";
equation
G_m = if t <= r_0 then 2 * mu_0 * (r_0 + 0.5 * l_g) * Modelica.Math.log(1 + 2 * t / l_g) else 2 * mu_0 * (r_0 + 0.5 * l_g) * Modelica.Math.log(1 + 2 * r_0 / l_g);
annotation (
defaultComponentName = "leakage",
Documentation(info = "<html>\n<p>\nPlease refer to the enclosing sub-package <a href=\"modelica://Modelica.Magnetic.FluxTubes.Shapes.Leakage\">Leakage</a> for a description of all elements of this package and to <a href=\"modelica://Modelica.Magnetic.FluxTubes.UsersGuide.Literature\">[Ro41]</a> for derivation and/or coefficients of the equation for permeance G_m.\n</p>\n</html>"));
end CoaxCylindersEndFaces;