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How can I determine the inductance value that matches the exact value for a bar conductor?

Hello Altair community ,

I have simulated an aluminum conductor bar as shown in the attachment, powered by a low current source at a frequency of 60Hz similar to the circuit in the attachment. However, the inductance value is consistently lower than the exact value. Can anyone please help me with this?

circut.jpg

geometric.jpg

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Flux

v2020.0

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C_Favre

Hello,

In case of a solid bar in air, you can compute the inductance using the energy in the domain using the following formula:

E=0.5*L *IRMS²

The energy (E) in the domain can be computed using the menu Computation -> On physical entity -> Compute

In the new windows click on Region, choose the spatial group as 1_Domain and select Energy.

After that you can extract the inductance L from the previous formula.

I hope this helps.

Best regards.

Cyril Favre

Neo Li

Add some comments,

When it comes to inductance calculation, there might be two ways to value it.

one from the energy side, E=0.5*L*Irms^2, so the enough space or study domain area should contain the emag enery to value the proper inductance.

the other way is from the circuit formula, Z=R+j*omega*L, if the current source is with 0° phase, then the image part of the voltage cross the conducting part is all contributed by the indutance, image(U(soild_conduct))=omega*L*Irms.

best regards,

Chenxi

Ovando_RBB

Hi there,

Got a question, when you said "is consistently lower than the exact value"; may I ask which formula or measuring method did you use to consider that number as the exact value?; that might help to shed light the differences between the computed and the "exact value" that you are targeting.