Need help in magnetostatic analysis

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

Need help in magnetostatic analysis

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 124 times
coil.jpg (266.77 KiB) Viewed 1840 times

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

Re: Need help in magnetostatic analysis

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

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 (268.24 KiB) Viewed 1835 times
coilClaudio.jpg (268.79 KiB) Viewed 1835 times