https://femm.drsz.pl/ 2026-04-18T08:57:27+00:00 https://femm.drsz.pl/ https://femm.drsz.pl/ttps://femm.drsz.pl/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-05-19T21:23:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/3-phase_currents?rev=1716146590&do=diff 3-phase currents All currents in FEEM are peak, so for RMS the values have to be scaled accordingly. In order to set up a 3-phase system of currents, with the same value of 1 A peak for each phase, and phase angles as indicated, the following strings should be entered in the appropriate current definition in FEMM magnetic model, with text/html 2020-10-11T00:05:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/aladdin_free_public_license?rev=1602367536&do=diff Aladdin Free Public License The following text was extracted from FEMM 4.2 (Apr 11 2012). ---------- ---------- Finite Element Method Magnetics is distributed under the terms of the Aladdin Free Public License: ---------- Aladdin Free Public License (Version 8, November 18, 1999) Copyright (C) 1994, 1995, 1997, 1998, 1999 Aladdin Enterprises,Menlo Park, California, U.S.A. All rights reserved. text/html 2024-04-24T20:18:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/colours_of_the_legend?rev=1713982683&do=diff Rainbow colours Colours of the “color plot” are defined in the text file (use Notepad to edit): C:\femm42\bin\femmview.cfg Original Examples of other configurations Color and Grey scale (Grey scale can be set to colour too) <Color00> = 255 0 255 <Color01> = 255 37 195 <Color02> = 255 69 147 <Color03> = 255 98 108 <Color04> = 255 123 76 <Color05> = 255 148 51 <Color06> = 255 171 31 <Color07> = 255 194 16 <Color08> = 255 217 6 <Color09> = 255 242 1 <Color10> = 242 255 1 <Colo… text/html 2024-05-07T22:07:39+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/combined_radiation_and_convection_boundaries?rev=1715112459&do=diff Combined radiation and convection boundaries In FEMM it is not possible to assign two types of boundaries simultaneously to the same surface. However, it is possible to do some tricks such that an equivalent problem can be define in which both of these types of boundaries can be combined to give a very similar effect. The whole method is described in detail in this paper: text/html 2021-12-20T23:16:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/loss_angle?rev=1640038606&do=diff Loss angle for magnetic materials The value (see Fig. 1 and Fig. 2) is responsible for “hysteresis loss”. The eddy current loss is dictated by the Electrical conductivity (reciprocal of resistivity). It is important that all the values are entered with the correct units, as specified in FEMM. text/html 2023-08-02T23:15:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/lua_script_for_calculating_magnetic_coupling_coefficient_k?rev=1691010947&do=diff LUA script for calculating magnetic coupling coefficient k This script is made available courtesy of David Knierim: <https://groups.io/g/femm/topic/calculating_k/57959358?p=> {accessed 2023-08-02} -- 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 pro… text/html 2025-03-09T10:59:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/lua_scripting_tips?rev=1741514350&do=diff LUA scripting tips This page contains tips for using Lua 4.0 with FEMM 4.2. Some of these are documented in FEMM help file (User's manual) but some are not. Full LUA 4.0 documentation: <http://www.lua.org/manual/4.0/> Comments To insert a comment use two hyphens, at the beginning of a line or at the end of command: text/html 2023-06-09T23:13:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/lua_with_simple_polar_co-ordinates?rev=1686345227&do=diff Example of LUA code for using FEMM with polar co-ordinates: function rz (R1,Z1,R2,Z2,arcangle,arcseg) -- R=radius, Z=angle if R2==nil then R2=0 end if Z2==nil then Z2=0 end return R1*cos(rad(Z1)),R1*sin(rad(Z1)), R2*cos(rad(Z2)), R2*sin(rad(Z2)), arcangle, arcseg end -- use the rz() function to convert mi_addnode(rz(1,45)) mi_addnode(rz(2,-45)) mi_addarc(rz(2,-45, 1,45,180,1)) mi_addsegment(rz(1,45,2,-45)) mi_zoom(rz(2,-90,2,45)) -- for other functions reuse the 5th parameter, e.g. mi_… text/html 2021-11-04T22:45:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/magnetic_coupling_factor_lua?rev=1636062346&do=diff Magnetic coupling factor 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. Download the FEM+LUA files: -- 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 … text/html 2021-06-08T20:02:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/measure_local_current?rev=1623175340&do=diff Measure local current Problem: Current is distributed in a non-uniform way. How to measure or integrate the current value over only a part of the area? Solution: Use line integral. Example: There is a round wire with non-uniform current distribution due to text/html 2024-06-15T19:00:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/power_loss_in_windings?rev=1718470801&do=diff Power loss in windings In FEMM the windings can be represented by explicit wires (each wire drawn separately, each representing single turn) or as a bulk (with number of turns N specified for the whole block). Windings can be represented by a number of turns text/html 2023-08-16T23:10:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/real_and_imaginary_values_of_l_and_r?rev=1692220256&do=diff Real and Imaginary values of L and R In DC simulations (f = 0 Hz) the circuit property results are simple real number denoting the peak values of current and voltage, and direct values of inductance L and resistance R. However, in AC simulations (with f > 0 Hz) the circuit property shows inductance L and resistance R as complex numbers with real and imaginary components. text/html 2022-06-01T11:36:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/simple_current_flow_simulation_in_femm_-_step-by-step_tutorial?rev=1654076187&do=diff Simple CURRENT FLOW simulation in FEMM - step-by-step tutorial Caution: The current flow solver in FEMM does NOT take into account the magnetic field, hence no AC phenomena such as skin effect are present in the solution, even though arbitrarily high frequency can be assigned to as the excitation. text/html 2021-05-11T22:08:17+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/simple_electrostatic_simulation_in_femm_-_step-by-step_tutorial?rev=1620763697&do=diff Simple ELECTROSTATIC simulation in FEMM - step-by-step tutorial This page shows a step-by-step tutorial of a very simple magnetic simulation. Helpful page? Support Encyclopedia Magnetica. All we need is $0.25 per month? Come on... ;-) ---------- Step 1 - solver text/html 2024-03-16T18:39:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/simple_heat_flow_simulation_in_femm_-_step-by-step_tutorial?rev=1710610749&do=diff Simple HEAT FLOW simulation in FEMM - step-by-step tutorial This tutorial shows a very simple problem for HEAT FLOW coupled with MAGNETIC simulation. Step 1 - set up magnetic solver Open FEMM and start new problem, menu > File > New . Select Magnetics problem text/html 2022-06-01T10:13:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/simple_magnetic_simulation_in_femm_-_step-by-step_tutorial?rev=1654071211&do=diff Simple MAGNETIC simulation in FEMM - step-by-step tutorial This page shows a step-by-step tutorial of a very simple magnetic simulation. Other tutorials: * <https://www.femm.info/wiki/MagneticsTutorial> * <http://nicadd.niu.edu/~syphers/tutorials/FEMMnotes.html> * <http://lesliegreen.byethost3.com/articles/FEMM4_2.pdf?i=1> * <https://www.ti.com/lit/an/snoaa04/snoaa04.pdf> Helpful page? Support Encyclopedia Magnetica. All we need is $0.25 per month? Come on... ;-) text/html 2025-04-29T10:39:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/start?rev=1745915971&do=diff Start This website is devoted to gathering extended documentation on the FEMM - 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 text/html 2024-02-14T22:53:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/symmetry_and_boundary_conditions?rev=1707947623&do=diff Symmetry with Dirichlet and Neumann boundary conditions In FEMM: " If no boundary conditions are explicitly defined, each boundary defaults to a homogeneous Neumann boundary condition. However, a non-derivative boundary condition must be defined somewhere (or the potential must be defined at one reference point in the domain) so that the problem has a unique solution. text/html 2021-11-22T21:25:25+00:00 Anonymous (anonymous@undisclosed.example.com) https://femm.drsz.pl/doku.php/users_manual?rev=1637612725&do=diff Finite Element Method Magnetics, Version 4.2, User’s Manual October 25, 2015 David Meeker dmeeker@ieee.org [download PDF] Chapter 1 Introduction FEMM is a suite of programs for solving low frequency electromagnetic problems on two-dimensional planar and axisymmetric domains. The program currently addresses linear/nonlinear magnetostatic problems, linear/nonlinear time harmonic magnetic problems, linear electrostatic problems, and steady-state heat flow problems.