Re: [femm] Coil with multiple turns

[David Meeker <dmeeker@xxxxxxxx>]

milanhampl wrote:

> Hi,
> I'm working on my diploma theses and using FEMM for some computations.
> I model a field of gap in toroidal magnetic soft ferrit. The only
> thing I need, is how to model coil with multiple turns. I've tried to
> make the coil like a block with a circuit property, but I read about
> this and it should model only one turn. We know the curent in coil
> and a number of turns, but don't how to make a model. I'm sending an
> example, if you would like to make more accurate idea about this
> problem.
> Thanks
>
> Milan Hampl


Just assign the current to be the total number of amps*turns, rather 
than just the amps per turn.

If you are doing calculations at non-zero frequencies, it is also good 
to assign the conductivity of the region occupied by the coil to be 
zero. If the conductivity is assigned to be something non-zero, eddy 
currents are induced that redistribute the currents within the coil's 
cross-section, which is non-physical with a wound coil.

Dave.