How to judge the magnetic performance of the magnetic connector？
The performance of general magnetic materials can be expressed by its four parameters, namely residual magnetic induction intensity (referred to as remanence) Br (unit Gauss Gs or mullite mT, 1mT=10Gs), coercivity Hcb (unit Oe), Intrinsic coercivity Hcj (unit Oe), maximum magnetic energy product (BH) max (unit MGOe), among which the three parameters Br, Hcj, (BH)max are the most direct expressions.
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 the magnet is magnetized; the size of Hcj can indicate the ability of the magnet to resist demagnetization and temperature resistance after magnetization; (BH)max is the maximum value of the product of Br and Hcj, Its size directly indicates the performance of the magnet. At present, we have not detected any magnet with bonded NdFeB(BH)max energy greater than 11.5.
Generally speaking, for magnets with similar (BH)max, if Br is higher, Hcj is lower; if Hcj is higher, Br is lower. We can not only determine the quality of the product by the level of (BH)max but also see whether the level of Br and Hcj is suitable for the product we need.
The influence of the size of the three on magnetization
As we all know, 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 higher surface magnetism, but at the same (BH)max value, Br and Hcj The level of has the following effects on magnetization:
Br is high, Hcj is low: Under the same magnetizing voltage, higher surface magnetism can be obtained;
Br is low, Hcj is high: To obtain the same surface magnetization, a higher magnetizing voltage is required;
Does the size of the three indicate the quality of the material?
We can’t determine the quality of Br, Hcj, (BH)max by the level of Br, Hcj, (BH)max, strong magnet manufacturers determine the level of the three according to the use of the product and the required characteristics; even under the same (BH)max value, It also depends on the purpose of the product and the requirements for magnetization to decide whether to use high Br and low Hcj or vice versa.
For multi-pole magnetization, magnetic powders with high Br and low Hcj should be used. For magnetic tiles, strong magnet manufacturers generally use magnetic powders with high Hcj and low Br. Magnetic current and overload.