Maxwell 3D (ANSOFT)

Fuxue Jin

In Maxwell, most of time you don't draw the real winding (turns, layers and so on). You draw a 3D object and specify the cross section as stranded and define how many turns.

kovibb

Hi everbody,

I have created project for my thesis and everything is already set up.The problem is that my Maxwell version sent me back message error about "setting up first generation" when i start genetic algorithm in optimetrics analysis. I hear that can be bug. So I want to ask for help, I sent you my project,you try to run it on your machine and sent me result back with all project. Please,Is here someone who would do it?

Thank a lot.

arial947

Hello,

I have worked a good deal with Magnetostatic solutions in Maxwell; however, I now have to design an electromagnetic system that requires a transient setup. I have a single coil electromagnet with a ferrite core that I need to operate at a frequency of 50 kHz. I set up the meshes, including the skin depth, as well as an external circuit with a sinusoidal current source. My solution time step is therefore 1e-6 and the stop time is 1e-4. I specified that I want the field values saved at the same points by adding them to the list under 'Save Fields', but after I run the simulation, I do not see how to view these results. Does anyone know the best way to view the fields calculated at these time steps?

Thanks,

Arielle

gerbi

Hi Arielle,

after the solution is complete (for a specific time moment) it can be viewed by double clicking on "Time" button in your main window (in left bottom corner, just under your model or Viev/Set Solution Context). There you can choose solution to view (and when you will select one you can update your Fields Overlays to this specific time moment).

jerrard

Hello,

I am working on modeling in Maxwell an inductive charger for electric vehicles. The whole concept is quite similar to a transformer, though instead of simple windings or coils, litz wire is used. Would it be possible to design litz wire like a normal coil? Would it be all right if I drew a circular or rectangular conductor with a specified diameter? And if so what would be the size of the cross section of the conductor?

SirAskalot

If I state that: A solid circular or rectangular conductor would be a good approximation to a litz wire, IF you specify that eddy-currents are NOT induced in the conductor. Would you agree? And can you give a reasoning behind the statement?

As for the cross section, it depends on the effects you want to model. In reality a coil, and especially a litz wire would give a "copper fill factor" of less than 1, due to insulation. If you are unsure if the radius and fill factor has a effect on the solution you can try using different radii and see if there is a difference in your "answer".

jerrard

SirAskalot thanks a lot for your answer.
I agree that if I specify that eddy-currents are not induced in the conductor, a better approximation of a litz wire can be achieved. Considering the radius, I will try using different radii and see how my answer is affected.
Yet i am unsure of how to model the litz wire considering the number of turns: For my application I need a litz wire of two turns for the "primary" of my charger (for a transformer the litz wire would be a coil of two turns) carrying a current of 200A at 20kHz. I also need 16 turns of litz wire for the "secondary".
Would it be OK to define the conductor as stranded and specify the number of conductors as 2 for the "primary" and 16 for the "secondary"? Or would it be a better idea to draw two connected conductors for the primary and 16 conductors for the secondary and define them as solid?

SirAskalot

It again depends on what effects you want to model, but most times its not necessary to draw each turn.(most times are when eddy currents like proximity effect, skin effect etc. are neglected in the coil/winding) So I would agree with you regarding defining the conductor as stranded, and use a multiplier like 2 and 16 (number of turns or similar in a dialog box).

The reason for neglecting these effect in coils are due to the complexity of drawing and meshing such small elements. Analytic formulas may be used instead for calculating the neglected phenomena, like resistive losses etc.