Permanent magnetic materials: the magnetism of permanent magnetic materials does not disappear after being magnetized by an external magnetic field, which can provide a stable magnetic field to the external space. There are four commonly used indicators for NdFeB permanent magnets:

Remanence (BR) in Tesla (T) and Gauss (GS) 1gs = 0.0001t

When a magnet is magnetized by an external magnetic field in a closed-circuit environment until the technology is saturated, the external magnetic field is cancelled. At this time, the magnetic induction intensity of the magnet is called remanence. It represents the maximum magnetic flux that the magnet can provide. It can be seen from the demagnetization curve that it corresponds to the case when the air gap is zero, so the magnetic induction intensity of the magnet in the actual magnetic circuit is less than the remanence. Nd-Fe-B is a practical permanent magnet material with the highest br found today.

The unit of magnetic coercivity (HCB) is ampere / meter (A / M) and Auster (OE) or 1 OE ≈ 79.6a/m

When the magnet after technical saturation magnetization is reverse magnetized, the value of the required reverse magnetic field intensity to reduce the magnetic induction intensity to zero is called the magnetic induction coercivity (HCB). However, at this time, the magnetization of the magnet is not zero, but the added reverse magnetic field and the magnetization of the magnet counteract each other. (the external magnetic induction intensity is zero) at this time, if the external magnetic field is cancelled, the magnet still has certain magnetic properties. The coercivity of Nd-Fe-B is generally more than 11000oe.

The unit of intrinsic coercivity (Hcj) is ampere / meter (A / M) and Auster (OE) 1 OE ≈ 79.6a/m

The reverse magnetic field strength required to reduce the magnetization of the magnet to zero is called intrinsic coercivity. Intrinsic coercivity is a physical quantity to measure the anti demagnetization ability of magnet. If the applied magnetic field is equal to the intrinsic coercivity of magnet, the magnetism of magnet will be basically eliminated. The Hcj of NdFeB will decrease with the increase of temperature, so the brand with high Hcj should be selected when working in high temperature environment.

The unit of magnetic energy product (BH) is Joule / m3 (J / m3) or high? Goe 1 mgoe ≈ 7 96k J/m3

The product of B and h at any point on the demagnetization curve is BH, which we call the magnetic energy product, and B × The maximum value of H is called the maximum magnetic energy product (BH) max. Magnetic energy product is one of the important parameters of the energy stored in a constant magnet. The larger the (BH) max, the greater the magnetic energy contained in the magnet. When designing the magnetic circuit, the working point of the magnet should be near B and H corresponding to the maximum magnetic energy product as far as possible.

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