Manufacturing method for permanent magnet rotor magnetic column

Abstract

The invention discloses a manufacturing method for a micro motor rotor. The manufacturing method comprises the processes of powder making, rough blank pressing, sintering, milling and processing, injection molding, and magnetizing. In the powder making process, H<3>BO<3>, camphor, alcohol, calcium stearate, silicon dioxide, Cr, Nb and Ti are added to fine magnetic powder, so that the internal structure of the electronic rotor is improved, the coercivity and abrasion resistance of the magnet are improved, and uniform magnetic field distribution in the rotor can be realized; powder obtained by crushing rough powder is mixed with fine powder based on proportions to prepare the final powder used for manufacturing the motor rotor, so that the smooth degree of the powder is effectively improved, and the uniformity of the internal structure of the rotor magnetic column can be further improved; in rough blank pressing, repeated material filling and cold pressing are performed for three times, so that the structural uniformity and the strength of the rotor magnetic column are improved, and the permanent magnetic performance of the rotor magnetic column is further improved; and by virtue of the pre-magnetizing in rough blank pressing and magnetizing after milling and processing, the magnetization is reinforced, and the permanent magnetic performance of the rotor is effectively improved.

Description

technical field [0001] The invention relates to a method for manufacturing a magnetic column, in particular to a method for manufacturing a permanent magnet rotor magnetic column, and belongs to the technical field of rotor magnetic column manufacturing methods. Background technique [0002] The rotor is the necessary structure for the motor to realize its function. With the wide application of the motor, the types and structures of the motor are also varied, and the application of the permanent magnet motor is more common. The rotor magnetic column of the permanent magnet motor is an important part of the rotor of the permanent magnet motor, and it is a necessary part to realize the performance of the permanent magnet motor. In the past, the magnetic columns of permanent magnet rotors are usually formed by wet pressing or dry pressing. Due to the complex structure of equipment and molds for wet pressing, the cost is high and the applicability is not good. However, the exis...

AI Technical Summary

Problems solved by technology

In the past, the magnetic columns of permanent magnet rotors were usually formed by wet pressing or dry pressing. Due to the complex structure of equipment and molds for wet pressing, the cost is high and the applicability is not good.

However, the existing dry pressing molding cannot guarantee the high magnetic performance of the permanent magnet rotor due to the poor orientation and fluidity of the material, which in turn affects the performance of the permanent magnet motor; at the same time, the traditional permanent magnet rotor magnetic columns are all pressed Grinding is performed after sintering into a cylindrical shape. During the sintering process, the rotor will be deformed, resulting in a waste of material and time-consuming and laborious grinding in the later stage.