Introduction of 3D Magnetic AC
Presentation
The Magnetic AC 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 Magnetic AC solution are:
- the same as for a Magneto Static solution
- the induced currents and the power losses by Joule effect in eddy current regions
Use
The Magnetic AC 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 Magnetic AC 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 Magnetic AC 3D 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.
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.
Main Magnetic AC 3D Limitations / Advices
Some functionalities of Flux for a 3D Magnetic AC Application are not available in this version in SimLab:
- It's mandatory to define an unit system before defining a Magnetic AC 3D solution. Without an unit system, the solving will not be carried out (limitation in the Flux solver)
- Periodicity in translation is not available (only the rotation is available).
- Specifically with Linux OS, it is mandatory to have a Solution with a name without "space" (attention: the default name contains "space").
- Import a mesh file via
After the mesh import (if you should add symmetry and/or periodicity) it is mandatory to do on the solution bodies in order to assign the topology information on the faces. This allows then to select faces for symmetries or periodicity.
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If some features are missing in SimLab for the simulation (material model, …), it is possible to Export and open in Flux (Flux legacy) at any time to continue the simulation set-up and solving, 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.