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There is a metallical structure. I can estimate how much steel are in it. I would like to know how tall/strong a magnet should be to maintain a certain object to the metallical structure.

The object is not that heavy, but it is submitted to multiple forces, like air flood, so it need to be sufficiently strong.

Knowing the force to handle, how could I know the size and optimal disposition of the magnet?

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This will be very difficult to calculate analytically. Your best bet will be to simply experiment, or use the rule of thumb specs that the magnet manufacturer provides. Usually this comes in the form of holding force on a standard iron plate of some kind.

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  • $\begingroup$ Thank you for the answer. So if I understand well the maufacturer wil gives the force of the magnet, but how can I convert this force into the force to handle? Especially if my magnet is hung up to an iron plate, but the other fore (other than magnetic) is applied parallel to the iron plate and orthogonal to the force of the magnet? $\endgroup$ – totalMongot Aug 31 '19 at 18:20
  • $\begingroup$ @totalMongot Magnet design generally is done with finite element analysis. You aren’t going to get an easy answer. Certainly not by being vague about the implementation. $\endgroup$ – Eric S Feb 15 at 13:02
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Well theoretically you will need the force that the magnet applies to the object you will like to hang. If i understand you correctly the object will be "sheared" off the magnet due to gravity. The closet thing you can do, is to calculate it via Friction. FR= µ*Fn.

Where µ is the friction coefficient, and FN is the Force that the supplier gives you. If FR is higher than the Force of Gravity your Object should stay.

BR

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