How can I accurately calculate mutual inductance between a coil and a magnet?

AI Thread Summary
Calculating mutual inductance between a coil and a magnet can be challenging, especially when using Neumann's formula, which assumes infinitesimally small wire diameters. The finite diameter of the coil wires affects the accuracy of the mutual inductance calculation, leading to incorrect results. For complex geometries, it's recommended to utilize simulation software like COMSOL to achieve more accurate results. Accurate modeling is crucial for reliable calculations in practical applications. Exploring advanced computational tools can significantly enhance the precision of mutual inductance estimations.
HiEdgar
Hi, All:

I am trying to calculate the mutual inductance between the coil (100 turns) and the magnet. Does anybody know any approaches that may lead a satisfactory answer.

So far, I have been using Neumann's formula which is the formula for mutual inductance, M, between two loops. I treated my magnet as another coil and used Neumann's formula to determine M then. The problem with that is that the diameter of the wires of my coil are finite whereas neumann's formula treats them as infinitisemally small. Because of this, my M became a funciton of magnet's wire diameter, which is not right. Any input is appreciated.

Thank you,

Edgar
 
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That is a notoriously difficult problem. For other than the simplest geomery, you will need a software tool such as COMSOL.
 
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