Re: [femm] current density

[Dave Squires <djsquires@xxxxxxxx>]

Mohamed,
There are probably several ways and others will likely
give different answers to help you. The easiest I have found
for setting up coils is to use the point properties and define
some plus and minus current properties such as "plus20" and
"minus20" for plus and minus 20 amps. Then enter points
in the slots to represent the wire turns and set them to have
the above point property assignments.

Trying to use areas with current densities with cross sectional
areas is problematic if you don't get the areas for plus and minus
to match. The simulator seems to hang if you don't get exact
matches for return currents. Point currents are much easier to
deal with.

Remember the FEMM is basically a static 2D simulator and would
give you snapshot simulations. You would have to hand calculate
the real currents needed per turn for different positions and assumed
back EMF effects.  At least this way you can measure torques and
flux densities where needed.

I hope this helps some. Others can help also. There are some sharp
guys in this group.

Regards,
Dave Squires

mohamed karakache wrote:

 

hello Femm yahoo groups

I want to ask some questions and i hope that i will receive an answer.

in the case of  polyphase electrical machines ,generally a stator is connetced to a polyphase electric system.How can i calculate the current density at the slots to enter it in Femm DATA.

thank you very much
 

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