Magnetization direction and orientation direction
The magnetism of permanent magnets mainly comes from its crystal structure that is easily magnetized. It can obtain extremely high magnetism under the action of a strong external magnetic field, and its magnetism will not disappear after the external magnetic field disappears. Therefore, “magnetization” is NdFeB A key step for permanent magnet materials to obtain magnetism.
Isotropic Magnet vs. Anisotropic Magnet
Magnetic materials are divided into two categories: isotropic magnets and anisotropic magnets.
Isotropic magnets have the same magnetic properties in any direction and can be attracted together arbitrarily
Anisotropic magnets have different magnetic properties in different directions, and the direction in which the best magnetic properties can be obtained is called the orientation direction of the magnet.
If the magnetic material has an orientation process in the production process, it is an anisotropic magnet. Sintered NdFeB is generally pressed by magnetic field orientation. Therefore, it is necessary to determine the orientation direction, that is, the direction of magnetization in the future, before production. Powder magnetic field orientation is one of the key technologies for manufacturing high-performance NdFeB.
Apply a magnetic field to the permanent magnet along the direction of the magnetic field orientation, and gradually increase the magnetic field strength to make it reach the technical saturation state. This process is called magnetization. Sintered NdFeB generally has several shapes such as square, cylinder, ring, tile, etc. Next, we will talk about their common magnetization directions.
In addition to the above-mentioned ordinary single-pole magnetization, the sintered NdFeB magnetic ring can also be multi-pole magnetized according to actual needs, that is, multiple N and S poles can be displayed on one plane after magnetization. Due to the use of specially designed specifications and pole head magnetization fixtures, additional magnetization fixture costs will be incurred.
The magnetizer is a tool for magnetizing and magnetizing magnetic materials or magnetic device magnets, through which a magnetic field is applied to the permanent magnet products that need to be magnetized. If the magnetized magnetic field does not reach the technical saturation magnetic field, the remanent magnetism Bj and coercive force Hcj of the permanent magnet will not reach their proper values. So how to determine the energy of the magnetizer? First, according to the size of the magnetized product magnet and the magnetization direction, determine the size of the magnetization tooling, and then calculate the size of the central magnetic field of the tooling. The size of the tooling magnetic field should be 3-5 times the coercive force of the magnet, and finally calculate the magnetization current. According to the current and the voltage of the magnetizer, finally determine the capacity of the energy storage capacitor of the magnetizer, and finally determine the energy of the magnetizer.
The basic principle of magnetization is to place the magnetic object to be magnetized in the magnetic field formed by the coil passing through the DC current. There are two main methods: DC magnetization and pulse magnetization.
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