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Forums
Engineering
Electrical Engineering
Calculating the flux density between two magnets
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[QUOTE="essenmein, post: 6292559, member: 647751"] Two approaches, one would be to pass a known current through the wire and measure the force, then B=F/IL. The second is the calculation method, and this is not as simple as it may seem. Permanent magnets are generally not offered as having x tesla. Fundamentally permanent magnets are a source of H or magneto motive force, the resultant B or flux density is determined by the reluctance of the magnetic circuit the magnet is in. Now a permanent magnet will exhibit some flux density even in free space, since it has built in reluctance dependent on the shape of the magnet. It is this flux density that the linked page is calculating. As soon as more magnets come into play, or you have a reluctance path other than air, these equations will not work. In this case you will have to at minimum estimate your magnetic circuit similar to this: [ATTACH type="full"]256329[/ATTACH] If you want to have the most force out of your wire in the case you have drawn, you'll want to add in magnetic path (ie iron) linking the backs of the magnets to each other so the only high reluctance path is through the air gap. [/QUOTE]
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Calculating the flux density between two magnets
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