EddyCurrent
For modelling of eddy current in a conductive magnetic flux tube
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
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_useConductance | useConductance | Use conductance instead of geometry data and rho | Scalar | true |
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 |
mo_T | T | Fixed device temperature if useHeatPort = false | Scalar | |
mo_TheatPort | TheatPort | TheatPort | Structure | |
mo_TheatPort/fixed | fixed | Cell of scalars | true | |
mo_TheatPort/start | start | Cell of scalars |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | 'abs_V_m' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
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 |