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modeling a 3d electromagnet in a stationary study
Posted 17 mag 2016, 06:38 GMT-4 Results & Visualization Version 5.1, Version 5.2 6 Replies
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it is giving me this error:
and i can't figure out why!
i tried to use and modify the "Multi_Turn Coil Winding around a Rectangular Ferromagnet cleared.mph" to help me make it. i modified the size and use it in a stationary rather than frequency domain so it fits my needs. but i can't seem to compute it.
im new in comsol, so it might just be a brain fart.
the error i get is:
Division by zero.
- Function: /
Failed to evaluate variable.
- Variable: comp1.mf.Jey
- Defined as: ((comp1.mf.ICoil_1*comp1.mf.mtcd1.eCoily)*N)/comp1.mf.mtcd1.area
Failed to evaluate variable.
- Variable: comp1.mf.Jy
- Defined as: comp1.mf.Jiy+comp1.mf.Jey
Failed to evaluate expression.
- Expression: d((comp1.mf.d*(-comp1.mf.Hx*comp1.mf.testcurlAx-comp1.mf.Hy*comp1.mf.testcurlAy-comp1.mf.Hz*comp1.mf.testcurlAz+comp1.mf.Jx*test(comp1.mf.Adepx)+comp1.mf.Jy*test(comp1.mf.Adepy)+comp1.mf.Jz*test(comp1.mf.Adepz)))*(dvol),{test@24})
the file is to large to upload it here. so i put it in my google drive at:
drive.google.com/open?id=0B52pVuxc2-oFU1FDNnZXV19aTms
thank you in advance.
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When using a "Multi-Turn Coil" feature you need to add a "Coil Geometry Analysis" study. You can either add a new study or simply add a new study step to your current study 1 sequence: Right-click "Study 1" and choose "Study steps" > "Other" > "Coil Geometry Analysis".
Make sure the Coil Geometry Analysis step is step 1 in the study sequence - you can drag it up using your mouse. Step 2 should be the Stationary step.
Now you should be able to solve it.
Running the model a warning is shown that domain 6 and 9 does not contain a mesh, so either remove those domains from the "Magnetic Field" physics interface or add a mesh to them
Best regards,
Morten
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but that is a far smaller problem.
thanks again
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Hint: Right-click the Data Set and select Duplicate. Now you can choose which data set to viasualize in the plot groups. More information is available in the "Postprocessing & Visualization Handbook, part 1 & 2" that is available at: www.comsol.dk/resources (look under "Product literature")
Hope it helps.
Morten
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problem solved, so far.
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This can happen if you complete the initial Model Wizard without choosing a study. To add a study to your Model Builder, just right-click the root (top of the Model Builder), and select "add study". Select your study from the "add study"-window, and you should be ready to go.
Hope it helps. Otherwise feel free to contact technical support: www.comsol.com/support
Morten