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Explanation of basic magnetic terms
(as defined by IEC) the components of an electromagnetic field characterized by magnetic field intensity H and magnetic flux density B. (China's national standard definition) a magnetic field is a field characterized by the force on a charged particle moving within it.
· hysteresis loop:
The closed relation curve of B and H obtained by repeated magnetization of ferromagnet from forward to reverse and then forward to one week of technology saturation is called hysteresis loop.
· remanence Br, UoMr or 4 PI Mr:
Permanent magnets from magnetization to technology saturation and remove the external magnetic field, the retained Mr, UoMr or 4 PI Mr Or Br, respectively called remanent magnetization intensity, residual intrinsic magnetic induction intensity and remanent magnetic induction intensity, they are collectively referred to as remanence.
· coercive force:
The reverse magnetic field strength required by Hcb and Hcj to reduce the B(magnetic induction strength) of permanent magnet magnetized to technology saturation to zero is called Hcj. Similarly, the reverse magnetic field strength required to reduce the intrinsic magnetic induction strength UoM or Mr To zero is called Hcj.
·****** magnetic energy product:
(BH) Max demagnetization curve on any bit of B and H is the product of Bm, Hm and (BH) represents the magnet magnetic energy density in air gap space, namely the unit volume of air gap magnetostatic energy, because the energy is equal to the magnet Bm and the product of Hm, so called magnetic energy product, the curve of magnetic energy product vary from B is called the magnetic energy curve, one of Bd and Hd is the product of * * * * * * value, called * * * * * * magnetic energy product.
· bending point Hk:
The magnetic field corresponding to the point Bi=0.9Br on the intrinsic demagnetization curve is usually referred to as the bending point magnetic field Hk. The larger the magnetic field Hk is, the better the squareness of the intrinsic demagnetization curve will be.
· remanence temperature coefficient (Br) :
The ratio of the reversible change percentage of the residual magnetic induction intensity to the temperature change degree when the temperature changes within a certain range is called the residual magnetic temperature coefficient.
· coercivity temperature coefficient of magnetization strength (Hcj) :
The ratio of the percentage of reversible change in coercivity of magnetization to the degree of change in temperature over a range.
· Curie temperature:
Temperature at which Tc spontaneous magnetization disappears.