In the process of the production, the inner magnetic domain will be canceling each other. On the macro level, the magnet do not have strong magnetism. Magnetization is the last step to make the magnet magnetized. The principle is to add a strong outter reversed magnetic field.It could thorough overcome the anisotropy barrier of the inner magetocrystalline. It could forced drive all the inconsistent atomic magnetic moment directional deflection. The final atomic magnetic moment will be arranged along with the orientation axis. When the outer magnetic field is removed, the magnetic moment will be locked on the orientation axis. The magnet will get a strong magnet performance.
There are many magnetization technologies:
- Pulse Magnetization: Using big volume capacitor bank to high speed charge, and then momentary discharge in the magnetizing coil. It will produce high intensity instantaneous pulsed magnetic field in ms grade. The electric pressure could add up to several thousand volt. The electric current could add up to more than ten thousand ampere. It could achieve high efficient staturated magnetization.
- Static Constant Field Magnetization: Superconducting magnet or big size electromagnet could provide continued several seconds to several minutes steady strong DC magnetic field. The application is super big size magnet, special shape magnet.
- Precision Multi-pole Magnetization: In the specified arranged and precised arranged coil array in the magnetization mold, one time impulsive discharge could make the one piece ring shape or disc magnet surface complex multipole space magnetic field with N pole and S pole alternate arranged. It is widely used in servo motor and micro step motor.
