Generally,NdFeB magnets are not magnetic in the early stages of production. Magnetization is one of the most critical steps in the magnet manufacturing process.
Magnets are made from rare earth elements such as neodymium, It is first mined, melted, ground, pressed and sintered before its magnetic energy is activated. During the pressing process, the particles in the magnet are aligned, thus giving them a specified direction or magnetic pole. This means that the direction of magnetization has been confirmed during the blank sintering process. However, neodymium magnets can be magnetic only after magnetization.
In order to make NdFeB magnets magnetic, magnet factories usually use professional magnetizing machines for magnetizing. The magnetizer is equipped with a coil and an electric current that, when turned on, emits an external magnetic field and activates the magnetism in the block.
There are two common methods of magnetization:
1.Static Magnetization: Usually produces a small magnetic field. Magnetization by static carbon-electric field usually produces only magnetic fields up to 2 MA/m.
2.Pulsed magnetization: Generally used for stronger magnetization. Pulsed magnetization is used when a stronger magnetic field is required or for multi-pole magnetization.
The magnetization method is based on several magnet characteristics such as material, strength and shape.
What are the different magnetizing directions for NdFeB magnets?
Magnetization of neodymium magnet is to put the semi-finished product after plating into the magnetic field force formed by the coil to magnetize it and turn it into a real permanent magnet.
Common magnetization methods for NdFeB magnets: thickness magnetization, axial magnetization. These two are the most common magnetization directions. There are also axial multi-stage magnetization, inner circle radiation magnetization, radial magnetization, radiation magnetization and so on.