EMAG Tutorial 4: 3 Phase Transformer

Transcription

1 EMAG Tutorial 4: 3 Phase Transformer Tutorial 4 ANSYS, Inc. Proprietary Inventory #

2 Start Workbench Workbench-Si imulation Dynamics 1-2

3 The Project Page Loads Hold down LMB to drag Geometry into the Project Schematic Workb bench-simulation Dynam mics 1-3

4 Double Click on Geometry to bring up Design Modeler GUI Design Modeler GUI Choose Meter Workbench-Si imulation Dynam mics 1-4

5 Restore archived WB project (transformer_begin.zip) then save as transformer.wbpj Workb bench-si imulation Dynamics 1-5

6 Create a new material in Engineering Data (the material property data that will be used in the analysis). Call the material Copper and define electric resistivity to be 3e-8 ohm-m and relative permeability = 1. imulatio Workb bench-si on Dynam mics 1-6

7 Double click on Geometry to bring up DM. Note planes named d corner1 - corner6 at center of radius of curvature of 6 coil corners. Workb bench-si imulation Dynamics 1-7

8 Use shift-lmb to highlight the planes shown and ensure that Export Coordinate System is set to Yes. Only then will these DM planes become coordinate systems in Mechanical (necessary to define current direction). Workb bench-si imulatio on Dynamics 1-8

9 Use the RMB anywhere in the graphics window to bring up the drop down menu shown. Chose Show All Bodies. The transformer core should appear. Workbench-Si imulatio on Dynam mics 1-9

10 From Tools, go to Enclosure. Establish the settings shown in Details View, ESPECIALLY Merge Parts? to Yes! Workb bench-si imulation Dynamics 1-10

11 Click Generate to create the enclosure Workb bench-si imulation Dynamics 1-11

12 From Tools, Click Freeze to enable a slice operation Workbench-Simulation Dynam mics 1-12

13 Slice the geometry using the ZXPlane. Click Generate to execute the slice operation. Workb bench-si imulation Dynamics 1-13

14 LMB RMB Set Select Mode to Solids and left click on the portion of the enclosure on the wrong side of the symmetry y plane. It should highlight as shown. Then right click anywhere in the graphics area and choose Suppress Body. Workbench-Si imulatio on Dynam mics 1-14

15 Once the unneeded portion of the enclosure is gone, it might be a good time to save the project. Browse for a suitable directory and/or create one of your own. Workbench-Si imulatio on Dynam mics 1-15

16 Return to the Project Page and drag a Magnetostatic Analysis System onto Geometry. Double click Model to open Mechanical. Workbench-Simulation Dynam mics 1-16

17 Workbench-Simulation Dynamics Ensure that all the planes defined in DM were successfully imported as coordinate systems in Mechanical 1-17

18 Shift- LMB Workb bench-si imulation Dynamics Use Shift-LMB to highlight the 6 corner coordinate systems and change their type to Cylindrical. Note the change in the appearance of the coordinate system symbols. 1-18

19 CNTL- LMB RMB Workbench-Si imulatio on Dynamics Select the enclosure and core solids and hide them so that only the coils remain visible 1-19

20 RMB RMB Workbench-Si imulation Dynamics Select all visible ibl bodies, then use the right mouse button to go to the corresponding bodies in the tree. 1-20

21 Workbench-Simulation Dynamics Change all coil body material assignments from the default Structural Steel to Copper (coils have free space permeability) 1-21

22 CNTL- LMB RMB Workb bench-si imulation Dynam mics Pick the solids at corner 1, and go to their bodies in the tree 1-22

23 Workbench-Simulation Dynamics Change the coordinate system assigned to these solids to corner1. Use the same procedure to assign coordinates systems corner2-corner6 to their respective coil solids. 1-23

24 Workbench-Simulation Dynamics Use the same procedure to assign coordinate system leg_in to the solids shown. 1-24

25 Workbench-Simulation Dynamics Use the same procedure to assign coordinate system leg_out to the solids shown. 1-25

26 Workbench-Simulation Dynamics Use the same procedure to assign coordinate system leg_back to the solids shown. 1-26

27 RMB From the Magnetostatic branch, use CNTL- LMB to select all exterior surfaces, then insert a Magnetic Flux Parallel condition. Workbench-Si imulation Dynamics 1-27

28 Go to Analysis Settings and define 20 steps with the first step having an end time of s, then edit the tabular data as shown. Workb bench-si imulation Dynamics 1-28

29 Highlight the coil solids shown and create a stranded source conductor comprised of 10 turns with a conducting cross section of m^2 Rename the source conductor to primary_a Workb bench-si imulation Dynam mics 1-29

30 Continue defining source conductors using 10 turns on each of the primary A-C phases on top and 5 turns on each of the secondary A-C phases on the bottom. 10 turns 5 turns Workb bench-si imulatio on Dynamics 1-30

31 Prepare to define the current for primary_a using a function. Workb bench-si imulation Dynamics 1-31

32 Enter the expression shown for the current assigned to primary_a Workb bench-si imulation Dynamics 1-32

33 Continue to enter the expressions for the rest of the source conductors as shown. To save time, you can cut and past what you typed for primary_a then make simple editing changes Source Conductor Per-turn coil current Primary_A 1*sin(360*50*time+0) Primary_B 1*sin(360*50*time+120) Primary_C 1*sin(360*50*time+240) Secondary_A -1*sin(360*50*time+0) Secondary_B -1*sin(360*50*time+120) Secondary_C -1*sin(360*50*time+240) Workb bench-si imulatio on Dynam mics 1-33

34 Establish coarse meshes to speed up the simulation turnaround. Try 0.05 in the core and coils and 0.10 for the surrounding air. Workb bench-simulation Dynamics 1-34

35 Click solve. The model should run in about a minute. You can then begin post processing by inserting results data requests. Right click on any of them and choose evaluate all results. Workb bench-si imulation Dynamics 1-35

36 Field data initially displayed as contour plots can be shown as vectors by clicking on the Graphics Mode button. Workbench-Simulation Dynamics 1-36

37 Variable length/constant length Adjust length Aligned with mesh/evenly spaced Adjust spacing/density Pressing the graphics button will give more buttons to change appearance of vector plots. Workb bench-si imulatio on Dynam mics 1-37

38 You can animate any of the results over time. Setting the number of frames to 20 usually looks nice. Workb bench-si imulation Dynamics 1-38