Explanation of basic magnetic terms
- Categories:Technical Support
- Time of issue:2017-07-25 00:00:00
(Defined by International Electrotechnical Commission IEC) The components of electromagnetic field are characterized by magnetic field strength H and magnetic flux density B. (Chinese national standard definition) The magnetic field is a kind of field whose characteristics can be determined by the force of the charged particles moving in the field. This force comes from the movement of the particle and the charge it carries.
The ferromagnet is magnetized from the forward direction to the reverse direction, and then to the forward direction until the technology is saturated for one week. The obtained closed relationship curve of B and H is called the hysteresis loop.
·Remanence Br, UoMr or 4πMr:
After the permanent magnet is magnetized to technical saturation and the external magnetic field is removed, the remaining Mr, UoMr or 4πMr or Br are called residual magnetization, residual intrinsic magnetic induction and residual magnetic induction, and they are collectively called residual magnetization.
Hcb, Hcj The reverse magnetic field strength required to reduce the B (magnetic induction intensity) of the permanent magnet that is magnetized to technical saturation to zero is called the magnetic coercive force. In the same way, the intrinsic magnetic induction intensity UoM or Mr is reduced to zero. The required reverse magnetic field strength is called intrinsic coercivity.
·Magnetic energy product:
(BH)max The product of B and H at any point on the demagnetization curve, namely Bm, Hm and (BH) represents the magnetic energy density established by the magnet in the air gap space, that is, the magnetostatic energy per unit volume of the air gap. The energy is equal to the product of the magnet Bm and Hm, so it is called the magnetic energy product. The relationship curve of the magnetic energy product with B is called the magnetic energy curve, and the product of Bd and Hd corresponding to a point has a value, which is called the magnetic energy product.
·Bending point Hk:
Generally, the magnetic field corresponding to the point Bi=0.9Br on the intrinsic demagnetization curve is called the bending point magnetic field Hk. The larger the Hk, the better the squareness of the intrinsic demagnetization curve.
·Remanence temperature coefficient (αBr):
The ratio of the percentage of the reversible change of the residual magnetic induction intensity to the degree of temperature change when the temperature changes within a certain range is called the residual magnetic temperature coefficient.
·Temperature coefficient of coercivity of magnetization (βHcj):
When the temperature changes within a certain range, the ratio of the percentage of the reversible change of the coercivity of the magnetization to the degree of temperature change.
Tc The temperature at which the spontaneous magnetization disappears.
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