China permanent magnet manufacturer:

How to insulate NdFeB magnets for export?

How to insulate NdFeB magnets for export?

Some foreign customers ask whether the NdFeB magnet can be transported by air. As we all know, the magnetism of NdFeB magnet is very strong. If you take it on board, it may affect the electronic equipment. Therefore, it is necessary to demagnetize the magnet. In fact, the magnetism of the magnet itself does not disappear, but through the magnetic material to change the magnetic field distribution of the magnet to weaken the magnetism, that is, magnetic insulation packaging.

Magnetic separation packaging is usually separated by iron sheet, fixed on six sides in the box, and then packed with pearl cotton bags and cartons, so as to pass the safety inspection of airlines.

What is the principle of magnetic separation?

The principle of magnetic isolation is to shield the magnetic field, which mainly refers to the stable magnetic field or low-frequency magnetic field. It mainly depends on the magnetic field circuit. If the box is made of magnetic material with high permeability, the “magnetic lines of force” that would have passed out of the box will be concentrated on the box material to form a closed loop, thus greatly reducing the leakage of magnetic lines outside the box.

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What are the general methods of magnetic separation?

In order to achieve magnetic shielding, the higher the permeability of the material, the better; the same material, the thicker the better; the same material and thickness, the more layers the better. In addition, the NdFeB magnet should be placed in the center of the shielding box, so as to avoid more concentrated magnetic lines on one side and more leakage.
Second, the material is magnetized. Magnetic materials are always magnetized in the magnetic field, but in addition to hard magnetic materials, once the external magnetic field is removed, the magnetism will be eliminated immediately. Therefore, if the shielding material is made of hard magnetic material and forms a new independent magnetic field, its effect will be affected, which is the reason why the shielding material can only use soft magnetic material.
If you ask, since soft magnetic materials are magnetized in a magnetic field, how can they be shielded? This is because the soft magnetic material is magnetized, and the new magnetic field intensity is completely changed according to the external original magnetic field intensity, and then according to the above high frequency magnetic field shielding principle, the elimination is realized“
Degaussing is just a layer of magnetic isolation material on the outside of NdFeB magnet, which has no effect on itself.



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