Finite Element Method Magnetics

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ActionLeft Button ClickRight Button ClickRight Button DblClickPoint ModeFunctionCreate a new point at the current mouse pointer locationSelect the nearest pointDisplay coordinates of the nearest pointLine/Arc Segment ModeActionFunctionLeft Button Click Select a start/end point for a new segmentRight Button Click Select the nearest line/arc segmentRight Button DblClick Display length of the nearest arc/line segmentActionLeft Button ClickRight Button ClickRight Button DblClickBlock Label ModeFunctionCreate a new block label at the current mouse pointer locationSelect the nearest block labelDisplay coordinates of the nearest block labelActionRight Button ClickGroup ModeFunctionSelect the group associated with the nearest objectTable 2.2: <strong>Magnetics</strong> Preprocessor Mouse button actionsThe Status Bar selection can be used to hide or show the one-line status bar at the bottomof the femm window. Generally, it is desirable for the toolbar to be displayed, since the currentlocation of the mouse pointer is displayed on the status line.The Toolbar selection can be used to hide or show the toolbar buttons. The toolbar is notfundamentally necessary to running femm, because any selection on the toolbar is also availablevia selections off of the main menu. If more space on the screen is desired, this option can bechosen to hide the toolbar. Selecting it a second time will show the toolbar again. It may be usefulto note that the toolbar can be undocked from the main screen and made to “float” at a user-definedlocation on screen. This is done by pushing the left mouse button down on an area of the toolbarthat is not actually a button, and then dragging the toolbar to its desired location. The toolbar canbe docked again by moving it back to its original position.2.2.4 Grid ManipulationTo aid in drawing your geometry, a useful tool is the Grid. When the grid is on, a grid of light bluepixels will be displayed on the screen. The spacing between grid points can be specified by theuser, and the mouse pointer can be made to “snap” to the closest grid point.The easiest way to manipulate the grid is through the used of the Grid Manipulation toolbar16
uttons. These buttons are pictured in Figure 2.3. The left-most button in Figure 2.3 shows andFigure 2.3: Grid Manipulation toolbar buttons.hides the grid. The default is that the button is pushed in, showing the current grid. The secondbutton, with an icon of an arrow pointing to a grid point, is the “snap to grid” button. When thisbutton is pushed in, the location of the mouse pointer is rounded to the nearest grid point location.By default, the “snap to grid” button is not pressed. The right-most button brings up the GridProperties dialog. This dialog is shown in Figure 2.4.Figure 2.4: Grid Properties dialog.The Grid Properties dialog has an edit box for the user to enter the desired grid sizing. Whenthe box appears, the number in this edit box is the current grid size. The edit box also containsa drop list that allows the user to select between Cartesian and Polar coordinates. If Cartesianis selected, points are specified by their (x,y) coordinates for a planar problem, or by their (r,z)coordinates for an axisymmetric problem. If Polar is selected, points are specified by an angle anda radial distance from the origin. The default is Cartesian coordinates.2.2.5 EditSeveral useful tasks can be performed via the Edit menu off of the main menu.Perhaps the most frequently used is the Undo command. Choosing this selection undoes thelast addition or deletion that the user has made to the model’s geometry.For selecting many objects quickly, the Select Group command is useful. This commandallows the user to select objects of the current type located in an arbitrary rectangular box. Whenthis command is selected, move the mouse pointer to one corner of the region that is to be selected.Press and hold the left mouse button. Then, drag the mouse pointer to the opposite diagonalcorner of the region. A red box will appear, outlining the region to be selected. When the desiredregion has been specified, release the left mouse button. All objects of the current type completelycontained within the box will become selected.Any objects that are currently selected can be moved, copied, or pasted. To move or copyselected objects, simply choose the corresponding selection off of the main menu’s Edit menu. Adialog will appear prompting for an amount of displacement or rotation.17
Page 6: Chapter 1IntroductionFEMM is a suit
Page 9 and 10: where J src represents the applied
Page 11: 1.4 Finite Element AnalysisFigure 1
Page 14 and 15: 2.2.2 Keyboard and Mouse CommandsAl
Page 18 and 19: 2.2.6 Problem DefinitionThe definit
Page 20 and 21: een defined. Pushing the Add Proper
Page 22 and 23: Figure 2.8: Boundary Property dialo
Page 24 and 25: Figure 2.9: Block Property dialog.r
Page 26 and 27: Figure 2.11: Sample B-H curve plot.
Page 28 and 29: Associated with the lamination thic
Page 30 and 31: Figure 2.14: Circuit Property dialo
Page 32 and 33: 2.3 Magnetics PostprocessorThe the
Page 34 and 35: Figure 2.19: Graph Mode toolbar but
Page 36 and 37: In all of these plots, the directio
Page 38 and 39: • A This integral, the evaluation
Page 40 and 41: To compute the force on a region or
Page 42 and 43: Figure 2.23: Properly defined conto
Page 44 and 45: • ToolBar Use this toggle to hide
Page 46 and 47: Point Mode KeysKey FunctionSpace Ed
Page 48 and 49: point, is the “snap to grid” bu
Page 50 and 51: Lastly, there is an optional Commen
Page 52 and 53: Figure 2.32: Boundary Property dial
Page 54 and 55: Figure 2.34: Materials Library dial
Page 56 and 57: 2.5.1 Postprocessor modesSimilar to
Page 58 and 59: 2.5.6 Density PlotDensity plots are
Page 60 and 61: In certain cases, the quantity to b
Page 62 and 63: Weighted Stress Tensor Volume Integ
Page 64 and 65: Probably the easiest way to get gra
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• pause() Waits for the ok button
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• mi setarcsegmentprop(maxsegdeg,
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3.3.7 Zoom Commands• mi zoomnatur
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- For a “Strategic dual image”
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3.3.10 Miscellaneous• mi savebitm
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3.4.2 Selection Commands• mo sete
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- upper_A Upper limit for A contour
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• ei setblockprop("blockname", au
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• ei movetranslate(dx,dy,(editact
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• ei deleteconductor("conductorna
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3.6.1 Data Extraction Commands• e
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• eo addcontour(x,y) Adds a conto
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3.6.5 Miscellaneous• eo close() c
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nection and manually transferring i
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Chapter 6Numerical MethodsFor those
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its Gauss Point). One desires a con
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[15] Q. Chen and A. Konrad, “A re
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Figure A.2: Magnet as an equivalent
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magnets are being handled prior to
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Figure A.6: Equivalent circuit for
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One could think of this solution as
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A quick note on computational effic
Page 112 and 113:
Figure A.8: Example input geometry.
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Finite Element Method Magnetics

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