WOLFRAM SYSTEM MODELER
This information is part of the Modelica Standard Library maintained by the Modelica Association.
Eddy currents are induced in a conductive magnetic flux tube when the flux changes with time. This causes a magnetic voltage drop in addition to the voltage drop that is due to the reluctance of this flux tube. The eddy current component can be thought of as a short-circuited secondary winding of a transformer with only one turn. Its resistance is calculated from the geometry and resistivity of the eddy current path.
Partitioning of a solid conductive cylinder or prism into several hollow cylinders or separate nested prisms and modelling of each of these flux tubes connected in parallel with a series connection of a reluctance element and an eddy current component can model the delayed buildup of the magnetic field in the complete flux tube from the outer to the inner sections. Please refer to [Ka08] for an illustration.
Description: =true, if heatPort is enabled
Type: Temperature (K)
Description: Fixed device temperature if useHeatPort = false
Description: Use conductance instead of geometry data and rho
Value: 1 / 0.098e-6
Type: Conductance (S)
Description: Equivalent loss conductance G=A/rho/l
Type: Resistivity (Ω·m)
Description: Resistivity of flux tube material (default: Iron at 20degC)
Type: Length (m)
Description: Average length of eddy current path
Type: Area (m²)
Description: Cross sectional area of eddy current path
Value: rho * l / A
Type: Resistance (Ω)
Description: Electrical resistance of eddy current path
useConductanceincluding alternative parameterization