Generally speaking, 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 and are first mined, melted, ground, pressed and sintered before their magnetic energy can be activated. During pressing, the particles in the magnet align, giving them a defined orientation or magnetic pole, which means that the direction of magnetization is confirmed during sintering of the blank. However, neodymium magnets are only magnetic when magnetized.
In order to make NdFeB magnets magnetic, magnet factories usually use professional magnetizing machines for magnetization. A magnetizer is equipped with a coil and an electric current that, when switched on, emits an external magnetic field and activates the magnetism in the block.
There are two commonly used magnetization methods:
1. Static magnetization: Usually a small magnetic field is produced. Magnetization by a static electric carbon field typically only produces fields up to 2MA/m.
2. Pulse magnetization: generally used for stronger magnetization. Pulsed magnetization is used when stronger magnetic fields are required or for multi-pole magnetization.
The magnetization method is determined based on several magnet properties such as material, strength, and shape.
Occasionally, manufacturers and others who deal with magnets in industrial settings may require magnets that are not magnetized.
What are the magnetization directions of NdFeB magnets?
The magnetization of the neodymium magnet is to put the semi-finished product after electroplating into the magnetic field force formed by the coil to magnetize it and become a real permanent magnet.
Common magnetization methods of NdFeB magnets: thickness magnetization and axial magnetization. These two are the most common magnetization directions. In addition, there are axial multi-stage magnetization, inner circle radiation magnetization, radial magnetization, radiation magnetization and so on.