The importance of magnetization direction and orientation direction of magnet
In the actual application process of the magnet, the magnetizing direction is very important to the use of the product. If the direction is wrong, there will be failures in actual use and even failure to work. In this article, Innuovo, a leading domestic high-tech enterprise in magnetic materials, will explain the magnetization direction of magnets.
The magnetism of a permanent magnet mainly comes from its crystal structure which is easy to be 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 neodymium iron boron. Wait for the key step for permanent magnet materials to obtain magnetism.
Isotropic magnets and anisotropic magnets
Magnetic materials are divided into two types: 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. The direction in which it can obtain the best magnetic properties is called the orientation direction of the magnet.
If the magnetic material has an orientation process during the production process, it is an anisotropic magnet. The sintered NdFeB is generally molded and pressed by magnetic field orientation, so the orientation direction, the upcoming magnetization direction, needs to be determined before production. Powder magnetic field orientation is one of the key technologies for manufacturing high-performance NdFeB.
Magnetizing direction
The permanent magnet is applied with a magnetic field along the orientation direction of the magnetic field, and the strength of the magnetic field is gradually increased to reach the technological saturation state. This process is called magnetization. Sintered NdFeB generally has several forms such as square, cylinder, ring, tile, etc. Next, we will talk about their common magnetization directions. Generally, for angle sensors, the magnetizing direction is radial magnetization, for position sensors, axial magnetization is used, and for motors, radial magnetization or radiation magnetization is used.
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 present on a plane after magnetization. Due to the use of specially designed specifications and pole head magnetizing fixtures, additional costs for magnetizing fixtures will be incurred.
Method of magnetizing:
The magnetizer is a tool for 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 cannot reach the technical saturation magnetic field, the remanence Bj and coercive force Hcj of the permanent magnet will not reach the expected value. So how to determine the energy of the magnetizer? First, determine the size of the magnetization tooling according to the size and magnetization direction of the magnetized product, 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 magnetizing current. According to the current and the voltage of the magnetizer, the capacity of the energy storage capacitor of the magnetizer is finally determined, and the energy of the magnetizer is finally determined.
The basic principle of magnetization is to place a magnetic object to be magnetized in a magnetic field formed by a coil through which direct current passes. There are two main methods: DC magnetization and pulse magnetization.
At present, Innova’s motor magnetic industry is mainly based on tiles and squares, and the high-temperature resistant grades are mainly H, SH, UH and EH. The flux consistency can be controlled within ±2.5%, and the magnetic declination angle is small. Features of high performance consistency. At the same time, Innuovo can customize magnets of various shapes according to customer requirements. The sample period is generally 10-15 days, which has the characteristics of rapid response to customer requirements and strong product prices.
