EddyCurrent

For modelling of eddy current in a conductive magnetic flux tube

    EddyCurrent

Library

Modelica/Magnetic/QuasiStatic/FluxTubes/Basic

Description

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 then determined by the geometry and resistivity of the eddy current path. Alternatively, a total conductance parameter can be used.

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

EddyCurrent_0

NameLabelDescriptionData TypeValid Values

mo_j

j

Scalar

mo_useConductance

useConductance

Use conductance instead of geometry data and rho

Scalar

true
false

mo_G

G

Equivalent loss conductance G=A/rho/l

Scalar

mo_rho

rho

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

Scalar

mo_l

l

Average length of eddy current path

Scalar

mo_A

A

Cross sectional area of eddy current path

Scalar

mo_R

R

Electrical resistance of eddy current path

Scalar

mo_useHeatPort

useHeatPort

=true, if heatPort is enabled

Number

0
1

mo_T

T

Fixed device temperature if useHeatPort = false

Scalar

EddyCurrent_1

NameLabelDescriptionData TypeValid Values

mo_abs_V_m

abs_V_m

abs_V_m

Structure

mo_abs_V_m/fixed

fixed

Cell of scalars

true
false

mo_abs_V_m/start

start

Cell of scalars

mo_arg_V_m

arg_V_m

arg_V_m

Structure

mo_arg_V_m/fixed

fixed

Cell of scalars

true
false

mo_arg_V_m/start

start

Cell of scalars

mo_abs_Phi

abs_Phi

abs_Phi

Structure

mo_abs_Phi/fixed

fixed

Cell of scalars

true
false

mo_abs_Phi/start

start

Cell of scalars

mo_arg_Phi

arg_Phi

arg_Phi

Structure

mo_arg_Phi/fixed

fixed

Cell of scalars

true
false

mo_arg_Phi/start

start

Cell of scalars

mo_omega

omega

omega

Structure

mo_omega/fixed

fixed

Cell of scalars

true
false

mo_omega/start

start

Cell of scalars

mo_lossPower

lossPower

lossPower

Structure

mo_lossPower/fixed

fixed

Cell of scalars

true
false

mo_lossPower/start

start

Cell of scalars

mo_TheatPort

TheatPort

TheatPort

Structure

mo_TheatPort/fixed

fixed

Cell of scalars

true
false

mo_TheatPort/start

start

Cell of scalars

Ports

NameTypeDescriptionIO TypeNumber

port_p

implicit

Positive quasi-static magnetic port

input

1

port_n

implicit

Negative quasi-static magnetic port

output

1

Port 3

implicit

Optional port to which dissipated losses are transported in form of heat

input

mo_useHeatPort