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Magnetic Circuits - Two-loop Magnetic Circuit
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Magnetic Circuits - Two-loop Magnetic Circuit

Konrad Walus, University of British Columbia

This simulation calculates the magnetic flux in a two-loop magnetic circuit with an air gap.

Model developed by Dr. Konrad Walus and Carl Tan

http://www.mina.ubc.ca/konradw_comsol_magnetostatics

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User Comments

Yang Gao
Jan 20, 2010 at 12:14pm UTC

Dear all

I have tried to calculate the H-field generate by the coil : (H*length = J*length*width). That is in the range of 0.5 A/m. (10 A/m2*0.05m)

However when I measured the H-field at the iron core it is somewhere between 0.009 A/m.

Can you explain this difference?

regards
Yang Gao

Jochen Heinrich
Mar 12, 2010 at 10:46am UTC

Dear Yang,

it seems your calculation is based on or at least equates the formula for the magnetic field in an infinite long coil H=I/L.
But this is not modeled here. Here we have two infinite long wires in z-direction (perpendicular to the screen). Each is surrounded by a yoke. Try to switch off the current in one wire. The field around the wire follows ampere's law. For example integrate H*dr along closed path around the wire in the yoke and the air gap.

Best regards,
Jochen Heinrich

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