For modelling of eddy current in a conductive magnetic flux tube


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.

Parameters (8)


Value: false

Type: Boolean

Description: =true, if heatPort is enabled


Value: 273.15

Type: Temperature (K)

Description: Fixed device temperature if useHeatPort = false


Value: false

Type: Boolean

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


Value: 0.098e-6

Type: Resistivity (Ω·m)

Description: Resistivity of flux tube material (default: Iron at 20degC)


Value: 1

Type: Length (m)

Description: Average length of eddy current path


Value: 1

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

Connectors (3)


Type: PositiveMagneticPort

Description: Positive magnetic port


Type: NegativeMagneticPort

Description: Negative magnetic port


Type: HeatPort_a

Description: Conditional heat port