NdFeB orientation direction? Where does the magnetism of sintered Nd-Fe-B ferromagnetism come from?

NdFeB orientation direction?

Magnetic materials are divided into isotropic magnets and anisotropic magnets. Isotropic magnets have the same magnetic properties in any direction and can be sucked together at will; Anisotropic magnets have different magnetic properties in different directions. The direction in which the best magnetic properties can be obtained is called the orientation direction of the magnet. For a square sintered NdFeB magnet, the magnetic field strength is the largest in the orientation direction and much smaller in the other two directions.

Where does the magnetism of sintered Nd-Fe-B ferromagnetism come from? How to magnetize it? How to choose the magnetization direction?

If there is an orientation process in the production process of magnetic materials, it is an anisotropic magnet. Sintered NdFeB is generally formed and pressed by magnetic field orientation, so it is anisotropic.

The magnetism of sintered NdFeB material mainly comes from its easily magnetized crystal structure. It can obtain extremely high magnetism under the action of external strong magnetic field, and its magnetism will not disappear after the external magnetic field disappears, Therefore, "magnetization" is a key step for sintered NdFeB materials to obtain magnetism. In the production and preparation of sintered NdFeB materials, magnetization is the last step before the delivery of finished products, but the magnetic field orientation of NdFeB blank and the upcoming magnetization direction have been determined when the magnetic powder is pressed into blank. Powder magnetic field orientation is one of the key technologies for manufacturing high-performance NdFeB. (bonded NdFeB is isotropic and anisotropic).

Magnetization direction and method

Magnetization is the process of applying a magnetic field to the sintered NdFeB permanent magnet along the direction of magnetic field orientation and gradually increasing the magnetic field strength to make it reach the technical saturation state.

Sintered Nd-Fe-B generally has several forms, such as square type, cylinder, ring, tile type, etc. next, we will talk about their respective magnetization directions.

In addition to the above ordinary monopole magnetization, sintered NdFeB can also be magnetized according to the actual needs, that is, after magnetization, multiple N and S poles can appear on one plane. Due to the special design specifications and sizes and the magnetization fixture of the pole head, additional magnetization fixture costs will be incurred.