Xiamen Everbeen Magnet Electron Co.,Ltd.


Professional Magnets Supplier--Neodymium Magnet,Alnico Magnet,Smco Magnet,Ceramic Magnet,Flexible Magnet









Home >> News >>Company News >> NdFeB magnets characterize magnetic material parameters
Details

NdFeB magnets characterize magnetic material parameters

The parameters of NdFeB magnets to characterize magnetic materials are:


1. Magnetic energy product (BH)

Definition: The product of the magnetic flux density (B) and the corresponding magnetic field strength (H) at any point on the demagnetization curve of a permanent magnet. It is a parameter that characterizes the total stored energy in the externally generated magnetic field per unit volume of a permanent magnet material. Unit: Mega High·Ao (MGOe) or Joule/m3 (J/m3)

Brief description: The product of B and H at any point on the demagnetization curve is called the magnetic energy product, and the maximum value of B×H is called the maximum energy product, which is the point D on the demagnetization curve. The magnetic energy product is one of the important parameters to measure the amount of energy stored in a magnet. When the magnet is in use, it corresponds to a magnet with a certain energy, and the volume of the magnet is required to be as small as possible.

NdFeB magnets characterize magnetic material parameters


2. Remanence Br

Definition: After magnetizing the magnetic material of a neodymium iron boron magnet, the magnetic field is removed, and the remaining magnetization on the magnetized ferromagnetic body.


3. Coercivity (Hcb, Hcj)

Hcj (intrinsic coercive force) The strength of the reverse magnetic field required to reduce the magnetization of the magnet to zero is called the intrinsic coercive force. Intrinsic coercive force is a physical quantity that measures the resistance to demagnetization of a magnet, and is the coercive force that indicates that the magnetization M in the material is reduced to zero. In the use of magnets, the higher the coercivity of the magnet, the better the temperature stability.

Hcb (magnetic induction coercive force) When a reverse magnetic field is applied to a magnetic material, the value of the reverse magnetic field strength required to reduce the magnetic induction intensity to zero is called the magnetic induction coercive force (Hcb). But at this time, the magnetization of the magnet is not zero, but the effect of the applied reverse magnetic field and the magnetization of the magnet cancel each other out. (The external magnetic induction is zero.) At this time, if the external magnetic field is cancelled, the magnet still has certain magnetic properties.


4. Temperature coefficient

Reversible temperature coefficient of remanence αBr: When the working environment temperature rises from room temperature T0 to temperature T1, the remanence Br of the neodymium iron boron magnet also decreases from B0 to B1; when the ambient temperature returns to room temperature, Br cannot return to B0. But only to B0'. After that, when the ambient temperature changes between T0 and T1 (assuming that the amount of change is not very large), the change of Br is linearly reversible. The reversible temperature coefficient of remanence αBr is: ·Similarly, we can get the temperature coefficient βHcj of the intrinsic coercivity Hcj as follows: The temperature coefficients α and β only measure the reversible change of magnetic properties, that is, the recovery temperature. Restore magnetic performance.


The answers to the parameters of NdFeB magnets to characterize magnetic materials are for reference only!


The above is about "NdFeB magnet characterizing magnetic material parameters". If you want to know more related knowledge or information, please continue to pay attention to us. I also hope that you can give us valuable comments or suggestions!


everbeen
More
Technical Support: jzabc | Admin Login