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Boron Permanent Magnet Isotropic Magnet
Oct 22, 2018

Boron permanent magnet isotropic magnet


Isotropic magnet: A magnet with the same magnetic properties in any direction.


Anisotropic magnets: Magnetic properties vary in different directions; and there is one direction in which the magnet with the highest magnetic properties is obtained. The sintered NdFeB permanent magnet is an anisotropic magnet.

Orientation direction: The direction in which an anisotropic magnet can obtain the best magnetic properties is called the orientation direction of the magnet magnet. Also known as "orientation axis", "easy magnetization axis".


Magnetic field strength: refers to the size of the magnetic field somewhere in space. It is represented by H, and its unit is ampere/meter (A/m).


Magnetization: refers to the vector sum of magnetic moments per unit volume of the material, expressed in M, in units of Am/m (A/m).


Magnetic induction: The magnetic induction B is defined as: B = μ0 (H + M), where H and M are magnetization and magnetic field strength, respectively, and μ0 is vacuum permeability. The magnetic induction is also called the magnetic flux density, that is, the magnetic flux per unit area. The unit is Tesla (T).


Magnetic flux: The total magnetic induction in a given area. When the magnetic induction B of the magnet is uniformly distributed on the surface A of the magnet, the general formula of the magnetic flux Φ is Φ = B × A. The SI unit of flux is Maxwell.

Relative Permeability: The ratio of the media permeability to the vacuum permeability, ie μr = μ/μo. In the CGS unit system, μo=1. In addition, the relative magnetic permeability of air tends to be 1 in practical use, and the relative magnetic permeability of copper, aluminum and stainless steel materials is also approximated.


Permeance: The ratio of flux Φ to magnetomotive force F, similar to the conductance in a circuit. It is a physical quantity that reflects the magnetic permeability of a material.


The permeability coefficient Pc is again the demagnetization coefficient. On the demagnetization curve, the ratio of the magnetic induction intensity Bd to the magnetic field strength Hd, that is, Pc = Bd/Hd, the permeability coefficient can be used to estimate the magnetic flux value under various conditions. For the isolated magnet Pc, it is only related to the size of the magnet. The intersection of the demagnetization curve and the Pc line is the operating point of the magnet. The larger the Pc is, the higher the working point of the magnet is, and the less likely it is to be demagnetized. Generally for an isolated magnet orientation


The larger the length, the larger the Pc. Therefore, Pc is an important physical quantity in the design of permanent magnet magnetic circuits.