workbench電機(jī)電磁場(chǎng)有限元分析ppt課件

1、9.0 New FeaturesLow Frequency Electromagnetic Analysis of MotorsWork Bench EnvironmentWorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentUpon entering the workbench environment, read in the design modeler geometry stored in motor2_base.agdb.12WorkshopANSYS v9.0Motor Analysis in the Workben

2、ch EnvironmentYou should see an end view of the motor geometry. Using the left mouse button (LMB) click on the blue dot adjacent to the triad in the lower right corner of the plot. This should result in the isometric view shown at right.The image can be dynamically rotated as follows:Position the mo

3、use cursor on the displayHold down the middle mouse button (MMB)Move the mouse cursorWorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentBring up the enclosure tool as shown at right. This will be used to automatically create a mesh of the magnetic domain between and surrounding the importe

4、d geometry Note the details that appear in the lower left pane after this selection is made. We will edit these default values.12WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentClick on the individual entries in the right hand column of the details pane and edit them as shown below.Encl

5、osure name changed to “Air”Shape: CylinderAlignment: AutomaticCushion: 8 mmTarget: All BodiesMerge Parts?: YesWorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentAfter editing the details, right click on “Air” in the tree. In the drop down list that appears, left click on “Generate”. This w

6、ill create a cylindrical volume of magnetic domain in which to immerse the imported parts. WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentIn the tree, open the item “1 Part, 5 Bodies” by clicking on the “+” symbol to the left of it. Do the same with the item labeled “part” that appears

7、 below it. Note that the single part in the model consists of 5 individual bodies (stator, rotor, magnet1, magnet2, and “solid”). Right click on “solid” and in the drop down menu, request that it be hidden in the display. Note that the display of any individual bodies may be either suppressed or res

8、tored in this manner.12WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentUse the Winding Tool Editor to bring up the “winding details” and “winding table” panes shown in the red boxes at right.12WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentIn the winding details pane, clic

9、k on the cell to the right of “Center Plane”, then select Plane6 from the tree, then click apply (step 3 at right). This positions/orients the windings so that predefined plane6 is the winding midplane.123: Click “Apply”WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentA winding table tex

10、t file containing information describing the rotor coils (winding.txt) is in the local working directory. Read the table as shown at right. Click the cell to the right of “winding Table File” in the winding details pane and click on “” to browse for the file.123WorkshopANSYS v9.0Motor Analysis in th

11、e Workbench EnvironmentOnce the file is read in, make the following additional changes in the winding details pane:FD2: Slot Angle = 22.5Clash Detection? = YesSetting clash detection to “yes” will bring up another row called “Bodies for Clash Detection” in the winding details pane. Click the cell to

12、 the right, highlight “rotor” in the tree, and click Apply. This will trigger a check for interference between the defined windings and the rotor stack.234: Click “Apply”1WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentAfter the winding specifications have been defined, create the windi

13、ng by right clicking on “Winding” in the tree and left clicking on “Generate” in the drop down list.WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentOne nice way to visualize the windings is to right click on rotor in the tree and choose “Hide All Other Bodies” in the drop down list. The

14、n, in the tree, click on any of the 6 individual coils comprising the winding (A.1, A.2, B.1, B.2, C.1, C.2). For example, the location of coil A.1 is shown below.231WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentNow click on the Project tab and choose “New Simulation”21WorkshopANSYS v

15、9.0Motor Analysis in the Workbench EnvironmentOnce the geometry is successfully attached in Design Simulation, define the current and phase angles for conductors A, B, and C as shown at right:Conductor A: 55 A 0Conductor B: 55 A 120Conductor C: 55 A 24021WorkshopANSYS v9.0Motor Analysis in the Workb

16、ench EnvironmentPrepare to define magnetic flux parallel boundaries on the exterior of the modeled domain as shown at right.21WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentIn order to more easily select the external surfaces of the modeled domain, suppress all bodies except “Solid”. F

17、or example, suppression of the stator body is illustrated at right. Right click on each body to be suppressed to bring up the drop down menu.When you are done, only the “Solid” body should remain unsuppressed (have a “” adjacent to it rather than an “x”).21WorkshopANSYS v9.0Motor Analysis in the Wor

18、kbench EnvironmentTo define flux parallel surfaces, select “Magnetic Flux Parallel” from the tree and click on the cell adjacent to “Geometry” in the magnetic flux details pane.Position the mouse cursor on any of the surfaces bounding the cylindrical volume and click with the left mouse button. Afte

19、r selecting the first surface, hold down the control button and select another. If necessary, release the Ctrl button, use the MMB to reorient the model as needed, and select the third (and final) surface.Click “Apply” in the magnetic flux parallel details pane.2143: Select external surfaces of cyli

20、nder using Ctrl + LMBWorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentRight click on any of the bodies in the tree and select “Unsuppress All Bodies”.Select “Rotor” from the tree and in the details pane, click on the arrow in the cell to the right of “Material”. From the drop down list,

21、choose “Import”.213WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentMake the selections shown in the “Import Material Data” dialogue box as shown at right. This will simultaneously import the BH curve for M14 steel into the database and assign this property to the rotor body.You may view

22、 the BH data (table and xy plot) by clicking on the arrow in the cell to the right of “Material” in the details pane and selecting “Edit M14 Steel” in the drop down list (see next slide).2134: Select “Edit M14 Steel” from the drop down listWorkshopANSYS v9.0Motor Analysis in the Workbench Environmen

23、tClick on the thumbnail sketch in the right hand pane to display the xy plot shown at right. Click on the Simulation tab to return to the model.3WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentClick on “Stator” in the tree. In the Stator details pane, click on the arrow in the cell to t

24、he right of “Material” and choose “M14 Steel” (this material property is now an active part of the database) from the drop down list.312WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentInitiate the creation of a new material property for body “Magnet1” as shown at right.312WorkshopANSYS

25、v9.0Motor Analysis in the Workbench EnvironmentClick on “Add/Remove Properties” in the Electromagnetics section. In the “Add or Remove Properties” dialogue box, choose “Linear Hard Magnetic Material”.312WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentDefine the coercivity and remanant m

26、agnetization:Hc = 750000 A/mBr = 0.6 TIt may also be necessary to supply a “dummy” value for Youngs Modulus to workaround unnecessary error trapping.Right click on “New Material”, select “Rename” from the drop down list, and change the name of the new material to “PM”.1243WorkshopANSYS v9.0Motor Ana

27、lysis in the Workbench EnvironmentClick on the Design Simulation tab.Click on the “Magnet2” body in the tree.Click on the arrow in the cell to the right of “Material” in the magnet2 details pane and choose “PM”We have now assigned PM properties to both magnets but have yet to define their polarity.

28、They will be radially poled. The upper magnet (Magnet1) will be poled radially outward (“+x” in a cylindrical coordinate system) while the lower PM will be poled radially inward (“-x” in cylindrical coordinates).1243WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentInitiate the creation o

29、f a cylindrical coordinate system.Click on “Model” in the tree.Choose “Insert” from the first drop down list.Choose “Coordinate System” from the second drop down list.123WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentClick on “Coordinate Systems” in the tree. Note: make no attempt to m

30、odify predefined “Global Coordinate System”.Click on “Insert” and “Coordinate Systems” in the cascading drop down lists as shown at right.123WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentRight click on “Coordinate System” in the tree and choose “Rename” from the drop down list. Rename

31、 the coordinate system as desired (for example, “PM_CSYS”, as shown at right). Click on the cell to the right of “Type” in the PM_CSYS details pane and change to Cylindrical.123WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentSelect “Magnet1” in the tree and assign to it the “PM_CSYS” co

32、ordinate system with “+x” polarization in the magnet1 details pane.Do the same for “Magnet2” except set the polarity in the “x” direction.3412WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentSelect “Mesh” from the tree. In the mesh details pane, establish the following settings: Global C

33、ontrol = AdvancedCurve/Proximity = 40Gap Distance: 7e-4 m2134WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentRequest the automatic detection of surfaces within 7e-4 m. This will allow further specifications to be made on surfaces found to be within this tolerance (next slide).21Workshop

34、ANSYS v9.0Motor Analysis in the Workbench EnvironmentIn the tree, select all surface pairs having a proximity of 7e-4 m (click “Gap Sizing” then hold down the shift key and select “Gap Sizing 6”).Set the Gap Aspect Ratio in the details pane to 3.21WorkshopANSYS v9.0Motor Analysis in the Workbench En

35、vironmentCreate the mesh21WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentIf you wish to view the mesh of an individual body, select it (right mouse button) in the tree, click on “Hide All Other Bodies” in the drop down list, and click on “Mesh” in the tree. The rotor mesh is shown belo

36、w.213WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentAdd a request for calculated values of “Total Flux Density” on all bodies (the default).21WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentAdd a request for calculated values of “Directional Force/Torque”.21WorkshopANSYS v

37、9.0Motor Analysis in the Workbench EnvironmentSet “Orientation” in the details pane to “Z Axis” (i.e., calculate torque about the global z axis).Click on the cell to the right of “Geometry” in the details pane and left click in the vicinity of the rotor centroid. You will see a number of “sheets” ap

38、pear in the display. Left click on these one at a time until you find the one associated with the rotor (the rotor will be highlighted in green as shown at right).Click “Apply” as shown. The rotor should be displayed in a dark blue color.213: Click around here4: Cycle through “sheets” until the roto

39、r is highlighted in green5: Click ApplyWorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentWe have specified nonlinear BH data for the rotor and stator but will suppress its usage so that the solution can be obtained expediently. Choose “Rotor” in the tree and set “Nonlinear Material Effects” to “No” in the rotor details pane. Do the same for the stator (shown at right).12WorkshopANSYS v9.0Motor Analysis in the Workbench EnvironmentExecute the linear solution a