Introduction of 2D AC Magnetic

Presentation

The AC Magnetic solution allows the study of devices in the harmonic state (sinusoidal steady state) for a given frequency.

The complex image of Maxwell's equations considers all physical quantities are sinusoidally time-varying for a given frequency. The magnetic field is connected with the presence of the time varying electric currents, compulsory sinusoidal. (Magnet type regions are forbidden).

This application takes into account the currents induced in the conducting regions (eddy currents). It also considers the skin effects and the proximity effects in the conducting regions.

The results obtained with AC Magnetic solution are:

the same as for a Magnetostatic solution
the induced currents and the power losses by Joule effect in eddy current regions

Use

The AC Magnetic solution can be used to model devices in different domains such as: induction heating, electromagnetic compatibility in general and electromagnetic screening in particular (e.g. transformers tanks), rotating machines in steady state...

The AC Magnetic solution can be of the field-circuit coupling type, for the study of rotating machines, of transformers, etc. in steady state, when the numerical model must take into account the electric circuits associated to the device.

Workflow

A graphic view of the 2D AC Magnetic workflow with functionalities possibles is presented below.

All functions are available in the different ribbon bars Geometry, Mesh, Analysis, ...

The content of each ribbon is adapted depending on the active solution.

Attention: In this SimLab version it is mandatory to define a global unit system before creating a 2D AC Magnetic Solution. Without a global unit system, the solving will not be carried out (limitation in the Flux solver).

A unit system is selected by default (MMKS (mm Kg N C s)). If not, to define the global unit system:

Activate
Choose the unit system

For more details on Unit System, please refer to the main page Unit System.

Correspondence between Flux and SimLab for 2D AC Magnetic


Categories	SimLab	Flux
Geometry	Vertex	Point
	Edge	Line
	Face	Face
	Coordinate	Coordinate systems
	Sketch variables	Geometric parameters
	Move	Transformation
Domain	Infinite Region (automatic)	Infinite Box
	Symmetry	Symmetry
	Periodicity	Periodicity
Mesh	Mesh Controls	Aided Mesh
		Mesh point, line
		Relaxation line, face
Physics	Material	Material
	Not implemented	Point Region
	Not implemented	Line Region
	Loads and Constraints	Face Region
	Motion	Mechanical set
	Passive Conductor Loads and Constraints	Circuit component - Solid conductor
	Circuit Designer	Circuit editor
	Sheet Lamination Loads and Constraints	Laminated non conducting region
	Solution settings	Solution scenario

Main 2D AC Magnetic Limitations / Advice

Some functionalities of FLUX for a 2D AC Magnetic solution are not available in this version of SIMLAB:

It is mandatory to define a unit system before defining a 2D AC Magnetic solution.
Physical parametric calculations are possible using the new parameter manager.
All FLUX models of materials are not available in SIMLAB.

Note: For more details, consult the dedicated page for the 2D AC Magnetic solution: Material (for MAC2D solution).
It is possible to Export and open in Flux at any time, as long as the bodies are meshed and assigned to the solution.

Use the right click on the Solution to open the contextual menu, and click on Export and open in Flux.

→ The SimLab Database *.slb is converted into a project *.FLU.

→ This project *.FLU is created in the selected working directory and Flux is automatically launched and this project *.FLU is opened.

→ Then you can use this project in Flux.

Note: This conversion can be useful to use physical Flux models that are not yet implemented in SimLab (material model, non meshed coil, magnetic cut, …).