Powerful magnets, it should be called magnetic steel, all in English, magnetic steel is mainly divided into two categories, one kind is soft magnetic, one kind is hard magnetic;
Soft magnetic include silicon steel sheet and soft magnetic iron core;
Hard magnetic including aluminum nickel and cobalt, provide ndfeb, samarium cobalt, ferrite, and among them, the most expensive is the samarium cobalt magnet steel, ferrite magnets, is the cheapest of the highest performance ndfeb magnets, but performance is the most stable, the temperature coefficient is one of the best alnico magnets, the user can choose according to different requirements of different hard magnetic products.
How to define the performance of the powerful magnets?
Mainly has the following three performance parameters to determine the performance of the powerful magnets: remanence Br: permanent magnets by the saturation magnetization to technology, and remove the external magnetic field, the retention of Br is called residual magnetic induction intensity.
Coercive force Hc: make the saturation magnetization to the technology of permanent magnet B down to zero, need to add the reverse magnetic field strength is called magnetic coercive force feeling, or coercive force, magnetic energy product BH: represents the magnet in the air gap space (
Two pole magnet space)
The magnetic energy density, air gap the magnetostatic energy per unit volume.
Due to the product of the energy is equal to the magnet Bm and Hm, so called magnetic energy product.
Magnetic field: the space of magnetic pole magnetic action of magnetic field on the surface of magnetic field, the magnetic induction intensity at the location on the surface of a permanent magnet