Introduction to magnetization: 1. The magnetization methods of neodymium iron boron magnets mainly include axial magnetization, radial magnetization, thickness direction magnetization, axial multi-stage magnetization, inner circle radiation magnetization, radiation magnetization, and other methods.

The magnetization process of neodymium iron boron is simple. Generally, the magnetizable object to be magnetized is placed in the magnetic field formed by a coil with direct current passing through it, and magnetized through a magnetizing machine. The process of magnetization is completed with just a gentle step of the foot (or a long press of the hand for one to two seconds).

Magnetic materials are divided into two categories: isotropic magnets and anisotropic magnets. The magnetic properties of isotropic magnets are the same in any direction and can be freely attracted together; The magnetic properties of anisotropic magnets vary in different directions, and the direction in which magnetic properties can be obtained is called the orientation direction of the magnet. A square sintered neodymium iron boron magnet has a higher magnetic field strength in the orientation direction, and a much lower magnetic field strength in the other two directions.

3. Multipole magnetization refers to the process of magnetizing two or more pairs of magnetic poles on the same magnet. Multipole magnetization is a complex technique. Multipole magnetization is mainly achieved through the use of pulsed magnetic fields, which is related to the working characteristics of the magnetization machine, the charging head, and the performance indicators of the magnet itself. The principle is to use the pulse magnetic field generated by instantaneous discharge of high current to magnetize permanent magnets such as neodymium iron boron. This device is usually composed of components such as capacitor banks, thyristors, control circuits, and charging heads.

Generally speaking, magnets with thinner thickness will be magnetized axially, while those with a thickness greater than the diameter will be magnetized radially. Overall, the smaller the diameter of the magnet, the higher the difficulty of magnetization. If the magnetization direction is wrong during this process, it can be a very troublesome matter. Demagnetization requires placing the magnet in a high-temperature environment (250-300 degrees) or in a demagnetization machine for demagnetization. 5. The tile shaped magnets used on motors are often radially magnetized. In addition to the ordinary single pole magnetization mentioned above, sintered neodymium iron boron can also be subjected to multipole magnetization according to actual needs, presenting multiple N and S poles on a plane. Due to the use of specially designed specifications and pole head magnetization fixtures, additional magnetization fixture costs will be incurred.