functionmu_rApprox
Approximation of relative permeability mu_r as a function of flux density B for soft magnetic materials
Extends from Modelica.Icons.Function (Icon for functions).
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.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.MagneticFluxDensity | B | Flux density in ferromagnetic flux tube element | |
| SI.RelativePermeability | mu_i | Initial relative permeability at B=0 | |
| SI.MagneticFluxDensity | B_myMax | Flux density at maximum relative permeability | |
| Real | c_a | Coefficient of approximation function | |
| Real | c_b | Coefficient of approximation function | |
| Real | n | Exponent of approximation function |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.RelativePermeability | mu_r | Relative magnetic permeability of ferromagnetic flux tube element |