The performance of general magnetic materials can be expressed by its four parameters, namely the residual magnetic induction intensity (remanent magnetism) Br (unit Gauss Gs or millite mT, 1mT=10Gs), coercive force Hcb (unit Oersted Oe) , the intrinsic coercivity Hcj (unit Oe), the maximum magnetic energy product (BH) max (unit MGOe MGOe), the three parameters of Br, Hcj, (BH)max in the magnet are the most direct representation. The relationship between Br, Hcj, (BH)max The size of Br can generally be considered to indicate the level of the surface magnetic field after magnetization; the size of the magnetic steel of Hcj can indicate the anti-demagnetization and temperature resistance of the magnet after magnetization. ability; (BH)max is the maximum value of the product of Br and Hcj, its larger

The performance of general magnetic materials can be expressed by its four parameters, namely the residual magnetic induction intensity (remanent magnetism) Br (unit Gauss Gs or millite mT, 1mT=10Gs), coercive force Hcb (unit Oersted Oe) , the intrinsic coercivity Hcj (unit Oe), the maximum magnetic energy product (BH) max (unit MGOe MGOe), the three parameters of Br, Hcj, (BH)max in the magnet are the most direct representation.





The relationship among Br, Hcj, (BH)max
The size of Br can generally be considered to indicate the level of the surface magnetic field after magnetization; the size of the magnetic steel of Hcj can indicate the ability of the magnet to resist demagnetization and temperature resistance after magnetization; (BH)max is the product of Br and Hcj The maximum value, its size directly indicates the performance of the magnet. We have not yet detected a magnet with a bonded NdFeB(BH)max greater than 11.5.

Generally speaking, in magnets with similar (BH)max, the higher Br, the lower Hcj; the higher Hcj, the lower Br. We can not only determine the quality of the product by the level of (BH)max, but also whether the level of Br and Hcj is suitable for the product we need.


Does the size of the three indicate the quality of the material?
We cannot determine the quality of Br, Hcj, (BH)max, but the use of the product and the required characteristics to determine the quality of the three; even under the same (BH)max value, it is necessary to It depends on the use of the product and the requirements of magnetization to decide whether to use high Br value, low Hcj, or vice versa.


The influence of the size of the three on magnetization
It is well known that under the same conditions, that is, the same size, the same number of poles and the same magnetizing voltage, the magnetic parts with high magnetic energy product can obtain high surface magnetism, but at the same (BH)max value, Br and Hcj The level of the magnetization has the following effects:

High Br, low Hcj: Under the same magnetizing voltage, higher surface magnetism can be obtained;

Br is low, Hcj is high: to obtain the same surface magnetism, a higher magnetizing voltage is required;

For multi-pole magnetization, the magnetic powder with high Br and low Hcj should be used, and for the magnetic tile, the magnetic powder with high Hcj and low Br is generally used. overload.