Unofficial
FEMM
documentation
by Dr Stan Zurek

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start [2021/09/17 20:20]
stanzurek [Currents] 		start [2025/04/29 10:39] (current)
stanzurek
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 ====== Start ====== ====== Start ======
  
-This website is devoted to gathering extended documentation on the [[http://www.femm.info|Finite Element Magnetics Method]]. It is a finite-element modelling software created by [[http://www.femm.info/wiki/DavidMeeker|Dr David Meeker]] and kindly released for free use to anyone, under the [[Aladdin Free Public License]].+This website is devoted to gathering extended documentation on the [[http://www.femm.info|FEMM - Finite Element Magnetics Method]]. It is a finite-element modelling software created by [[http://www.femm.info/wiki/DavidMeeker|Dr David Meeker]] and kindly released for free use to anyone, under the [[Aladdin Free Public License]].
  
 The **//Unofficial FEMM documentation//** website. The **//Unofficial FEMM documentation//** website.
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 ====== FEMM general settings ====== ====== FEMM general settings ======
   * [[Colours of the legend]] ("rainbow" colors)   * [[Colours of the legend]] ("rainbow" colors)
 +  * [[Symmetry and boundary conditions]] (Dirichlet and Neumann conditions)
  
 ====== MAGNETICS ====== ====== MAGNETICS ======
-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+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 tutorial ====
  
   * [[Simple MAGNETIC simulation in FEMM - step-by-step tutorial]]   * [[Simple MAGNETIC simulation in FEMM - step-by-step tutorial]]
Line 28: Line 30:
   * [[Loss angle]]   * [[Loss angle]]
 ==== Analyse ===== ==== Analyse =====
 +  * [[Power loss in windings]]
 ===== Magnetics post-process ====== ===== Magnetics post-process ======
 ==== Currents ==== ==== Currents ====
   * [[Measure local current]]   * [[Measure local current]]
  
-==== Magnetic coupling factor ==== +==== Inductance ==== 
-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: +  * [[Magnetic coupling factor LUA]]
- +
-<code> +
--- 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)  +
-</code>+
  
 +==== Real and Imaginary values of L and R ====
 +  * [[Real and Imaginary values of L and R]]
 ====== ELECTROSTATICS ====== ====== ELECTROSTATICS ======
 +==== Simple tutorial ====
   * [[Simple ELECTROSTATIC simulation in FEMM - step-by-step tutorial]]   * [[Simple ELECTROSTATIC simulation in FEMM - step-by-step tutorial]]
 ====== THERMAL ====== ====== THERMAL ======
 +==== Simple tutorial ====
 +  * [[Simple HEAT FLOW simulation in FEMM - step-by-step tutorial]]
  
 +==== Combined radiation and convection boundaries ====
 +  * [[Combined radiation and convection boundaries]]
 ====== CURRENT FLOW ====== ====== CURRENT FLOW ======
  
 +==== Simple tutorial ==== 
 +  * [[Simple CURRENT FLOW simulation in FEMM - step-by-step tutorial]]
 ====== LUA scripting ====== ====== LUA scripting ======
 +
 +Reference manual for Lua 4.0: http://www.lua.org/manual/4.0/
 +
   * [[LUA scripting tips]]   * [[LUA scripting tips]]
 +  * [[LUA with simple polar co-ordinates]]
 +  * [[LUA script for calculating magnetic coupling coefficient k]]
  
start.1631902822.txt.gz · Last modified: 2021/09/17 20:20 by stanzurek

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