This website is devoted to gathering extended documentation on the Finite Element Magnetics Method. It is a finite-element modelling software created by Dr David Meeker and kindly released for free use to anyone, under the Aladdin Free Public License.

The Unofficial FEMM documentation website.

• FEMM 4.2 - User's Manual, Oct 25, 2015
  • FEMM 4.2 - User's Manual, Oct 25, 2015 (extracted to HTML)
• FEMM 4.2 - User's Manual, Jan 30, 2018

• Rainbow colours (“rainbow” colors)

Don't know how to do something in FEMM? First, read through the manual. But perhaps you can find some useful tricks and tutorials below

• Simple MAGNETIC simulation in FEMM - step-by-step tutorial

• The length of segments for periodic and anti-periodic boundary should match to within 1e-6 of the base units used in the geometry.

• 3-phase currents

• Loss angle for magnetic materials

• Measure local current

LUA script for calculating magnetic coupling coefficient between two windings. The windings have to be set up as described in the comments in the code below:

-- Short Lua script for calculating coupling factor of two coils.
-- It presumes the problem is already defined in FEMM, and
-- that the two windings are defined by circuits named "pri" and "sec".
-- The problem may be DC or AC at a frequency of your choice.
-- Intended for circuits with series property.
-- Execute with the FEMM menu item File/OpenLuaScript.
clearconsole()
showconsole()
-- Simulate first with only secondary current:
mi_modifycircprop("pri",1,0)
mi_modifycircprop("sec",1,1)
mi_analyze()
mi_loadsolution()
print(mo_getcircuitproperties("sec"))  -- Optional display of intermediate results
print(mo_getcircuitproperties("pri"))  -- Optional display of intermediate results
i, Vsec, Lsec = mo_getcircuitproperties("sec")
i, Vpri_sec, Lpri_sec = mo_getcircuitproperties("pri")
-- Simulate next with only primary current:
mi_modifycircprop("pri",1,1)
mi_modifycircprop("sec",1,0)
mi_analyze()
mi_loadsolution()
print(mo_getcircuitproperties("sec"))  -- Optional display of intermediate results
print(mo_getcircuitproperties("pri"))  -- Optional display of intermediate results
i, Vsec_pri, Lsec_pri = mo_getcircuitproperties("sec")
i, Vpri, Lpri = mo_getcircuitproperties("pri")
-- Calculate and print coupling factor:
coupling_factor = sqrt(Lsec_pri * Lpri_sec / (Lpri * Lsec))
print("Coupling factor is:", coupling_factor) 

• Simple ELECTROSTATIC simulation in FEMM - step-by-step tutorial

• LUA scripting tips