Magnetic strength over distance

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To calculate the force exerted by an electromagnet on a small motor from a distance of about a foot, understanding the magnetic field distribution is essential. Numerical methods, and sometimes analytical methods, can be used for these calculations. The process is straightforward for objects in a magnetic field, even if they have complex shapes. However, determining local forces and torques requires finite element software, which often includes force calculation features. Accurate modeling is crucial for effective engineering applications involving electromagnets.
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I am working on an engineering project in which I am mounting an electromagnet onto a small RC robot. The link for the electromagnet is here http://www.mpimagnet.com/catalog.asp?prodid=670540&showprevnext=1
I was wondering if there was any way to calculate the force exerted by the magnet on a small motor from a distance of about a foot. Any ideas?
 
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magneto123 said:
I am working on an engineering project in which I am mounting an electromagnet onto a small RC robot. The link for the electromagnet is here http://www.mpimagnet.com/catalog.asp?prodid=670540&showprevnext=1
I was wondering if there was any way to calculate the force exerted by the magnet on a small motor from a distance of about a foot. Any ideas?

Yes, it's possible numerically ( in some cases analytically too). You need to know the distribution of magnetic field first. Calculating the total force applied on a body surrounded by air, in a magnetic field , is surprisingly simple even when the object has a complicated shape.
see http://www.fieldp.com/documents/stresstensor.pdf

Calculating local forces and torques are a little more challenging. You need to use a finite element software for such calculations. Calculation of the force is often one of the features of a finite element software.
 

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