20. What is BH Curve
BH curve is an important magnetic performance index of permanent magnet. When the magnets are in dynamic working conditions, the external reverse magnetic field H and the internal decreased magnet field cyclically changes. For sintered NdFeB, the more approximate to a straight line the B demagnetizing curve is, the more stable the magnets will be in dynamic conditions.
Notable is that when the B demagnetizing curve is not a straight line, the permeability μr of magnets in different point is different. It is vital important that how to make the magnets the most stable.
For the definition of BH Curve, the size of reverse magnet field is HK, Hk/Hcj shows the squareness of BH curve very clearly. Hcj is much greater than Hcb for High Hcj products. Hk/Hcj is also one of the important magnetic performance index which on the other side present the stability in dynamic condition.
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