Need help in magnetostatic analysis

Elmer cases by the users for the users
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teofilBitron
Posts: 41
Joined: 25 Feb 2011, 18:43
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Location: Italy

Need help in magnetostatic analysis

Post by teofilBitron » 30 Jan 2017, 11:31

Hi all,

I would simulate the magnetic field in a log coil. In the attached image you could find the good results between the 2D free software FEMM and the analytical result.
Unfortunatelly, for the Elmer I found an internal magnetic flux density about 10 time higher.

In the attache the sif input file.
Attachments
coilClaudio.sif
(3.84 KiB) Downloaded 67 times
coil.jpg
coil.jpg (266.77 KiB) Viewed 1268 times

teofilBitron
Posts: 41
Joined: 25 Feb 2011, 18:43
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Location: Italy

Re: Need help in magnetostatic analysis

Post by teofilBitron » 30 Jan 2017, 11:39

just a clarification:

the value in the image: 355.2428 [MA/m^3], is the value used in the sif file as body force for the coil:

... omissis ...

$ iC = 353.4457E+06 ! [A/m^3]

... omissis ...

Body Force 1
Current Density 1 = Variable coordinate
Real MATC "-iC*tx(1)/sqrt(tx(0)*tx(0)+tx(1)*tx(1))"
Current Density 2 = Variable coordinate
Real MATC "iC*tx(0)/sqrt(tx(0)*tx(0)+tx(1)*tx(1))"
Current Density 3 = 0
End

teofilBitron
Posts: 41
Joined: 25 Feb 2011, 18:43
Antispam: Yes
Location: Italy

Re: Need help in magnetostatic analysis

Post by teofilBitron » 30 Jan 2017, 11:53

ok. I foud the mistake.
The coil current have to be done in A/m^2:

$ iC = 33.867E+06 ! [A/m^2]

Sorry...
Attachments
coilCorrect.jpg
coilCorrect.jpg (268.24 KiB) Viewed 1263 times
coilClaudio.jpg
coilClaudio.jpg (268.79 KiB) Viewed 1263 times

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