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Input files
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HorshoeMag.MIN, HorshoeMag.GIN, HorshoeMagD.MIN, HorshoeMagD.GIN, HorshoeMag.SCR
Download PermanentMagnet.zip
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Description
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The goal is to find the force between a permanent magnet assembly and a steel rod. The assembly consists of two permanent magnets connect by a steel bend. No section of the bend is saturated, so a fixed value of MuR provides a good first approximation. Force calculations were performed using the Maxwell stress tensor integrated over either the rod surface or a surrounding diagnostic box. A check was made using the principle of virtual work in a displaced solution.
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Results
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Calculated forces using the Maxwell stress tensor
Surface of rod: 23.25 N
Surface of diagnostic box: 22.43 N
Calculated force using the virtual work method (0.1 cm displacement)
Field energy displaced 0.1 cm: 12.70812 J
Field energy original position: 12.68521 J
dU/dy = 22.91 N
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Comments
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The geometry was based on a Comsol example. There are some questions about the practicality of the Comsol parameters and the accuracy of the calculated force.
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