Correlation of residual magnetic induction (Br), intrinsic coercive force (Hcj), maximum magnetic energy product ((BH) max)


The size of Br can generally be considered to indicate […]

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 explain the ability of the magnet to resist demagnetization and temperature resistance after magnetization; , Its size directly indicates the performance of the magnet. We have not yet detected magnets with bonded NdFeB (BH) max greater than 11.5.

In general, in magnets with similar (BH) max, Br is high, Hcj is low; Hcj is high, Br is low. We can not only determine the quality of the product by the level of (BH) max, but also to see whether the level of Br and Hcj is suitable for the products we need.

Does the size of the three indicate the quality of the material?

We can't determine the quality of Br, Hcj, (BH) max by its high and low, we must determine the height of the three by the use of the product and the required characteristics; even under the same (BH) max value The high Br value, low Hcj, or vice versa depends on the use of the product and the magnetization requirements.

The effect of the three sizes on magnetization

As we all know, under the same conditions, that is, the same size, the same number of poles and the same magnetization voltage, the magnetism with high magnetic energy product can also obtain a high surface magnetism, but at the same (BH) max value, Br and Hcj The level 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 get the same magnetism, a higher magnetizing voltage is required;

For multi-pole magnetization, the magnetic powder with high Br and Hcj low is used, while for the magnetic tile, the magnetic powder with low Hcj and high Br is generally used, because the motor used for the magnetic tile is subjected to a large demagnetization current and overload.