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Calculation formula of magnetic force of powerful neodymium iron boron permanent magnet

People often ask how to calculate the magnetic force of a powerful neodymium iron boron magnet, and whether there is a formula that can be used. In fact, there are many factors that affect the external magnetic force of the magnet. The material of the attracted object; the same material, different thickness; the same sucked article , Different angles of attraction have a great influence. We can usually provide a reference magnetic value under the theoretical state. If you need accurate data, you still need to use a tension meter for physical testing. Theoretically, neodymium iron boron magnets can absorb objects that are about 500 times their own weight, so we can calculate the strong magnetism Estimate his ideal pulling force value by his own weight.


The density of the neodymium iron boron magnet is 7.5g/cm. We then calculate the corresponding weight according to the volume corresponding to the strong magnet of different shapes. The volume of the conventional size is calculated as follows:


1. The formula for calculating the weight of a round neodymium iron boron magnet: Such as: the specification diameter is 10mm, the thickness is 5mm The calculation formula is: 7.5*3.14*10*5/4000≈3g



2. The formula for calculating the weight of a square neodymium iron boron magnet: For example, F15*15*5 of this size The calculation formula is: 15*15*5*7.5 / 1000≈8.4g.



3. Calculation formula for the weight of ring-shaped neodymium iron boron magnet: π*(a + b)(a-b)* thickness* density/ 4000 (where a and b represent the outer and inner diameters of the ring, respectively)For example, the outer diameter is 20mm, the inner diameter is 10mm, and the thickness is 3mmThe calculation formula is: 3.14 * (20 + 10) * (20-10) * 3*7.5 /4000≈5.3g




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