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There are three main performance parameters to determine the performance of the magnet:

Residual Br: After the permanent magnet is magnetized to the technical saturation and the external magnetic field is removed, the retained Br is called the residual magnetic induction strength.

The coercivity Hc: reduces the B of the permanent magnet magnetized to the technical saturation to zero, and the required reverse magnetic field strength is called the magnetic-induced coercivity, or simply the coercivity.

Magnetic energy product BH: represents the magnetic energy density established by the magnet in the air gap space (the space between the two magnetic poles of the magnet), that is, the magnetostatic energy per unit volume of the air gap.