14 years experience expert of stable permanent magnet supplier

What is Magnetizing?

What do we often mean by magnetizing magnets? As the name implies, it is to magnetize a magnetic substance or to increase the magnetism of a magnet with insufficient magnetism. Generally, the magnetic object to be magnetized is placed in a strong magnetic field formed by a coil with direct current passing through it, and the magnetic field in the magnet is catalyzed by the external magnetic field.

The magnetizing direction of magnets can be divided into thickness magnetization, radial magnetization and so on. When it is affected by external energy, such as heating and impact, the magnetic moment direction of each magnetic domain will become inconsistent, and the magnetism will weaken or disappear.

There are two types of magnet magnetizers currently in use, constant current magnetizers and pulse magnetizers.
A. The working principle of the constant current magnetizer: the constant current direct current is passed through the coil to make the coil generate a constant magnetic field. It is suitable for magnetization of low-coercivity permanent magnet materials, such as ferrite and low-coercivity NdFeB.
B. The working principle of the pulse magnetizer: The coil generates a short super-strong magnetic field through the instantaneous pulse high current in the coil. Suitable for high coercivity permanent magnet materials or complex multi-pole magnetization. It is widely used in permanent magnet material production and application enterprises. It is suitable for the magnetization of various permanent magnet material parts and components, such as: AlNiCo series, ferrite series, rare earth permanent magnet series, etc. It has the characteristics of high efficiency and reliability. The equipment has no special requirements for the power configuration of the workplace, and is convenient and flexible to use.

Specifically, pulse magnetization is to first charge the capacitor with a high-voltage DC voltage, and then discharge it through a coil with a very small resistance. The peak value of the discharge pulse current can reach tens of thousands of amperes. This current pulse creates a strong magnetic field within the coil, which permanently magnetizes the hard magnetic material placed in the coil. The peak value of the pulse current of the magnet magnetizer capacitor is extremely high, and the performance of the capacitor to withstand the impact current is very high. The structure of the magnetizer is relatively simple. In fact, it is an electromagnet with strong magnetic force. It is equipped with iron blocks of various shapes as additional magnetic poles to form a closed magnetic circuit with the magnetized body. To be magnetized, as long as the excitation current is applied, it can be completed in an instant.

The magnetization directions of circular or ring magnets include axial, radial, multi-stage, and radiation magnetization. The NS poles of the square magnet will appear in pairs on two corresponding faces of the six faces. After the magnet is magnetized, it can be packaged and shipped.