Manufacturing method of micro motor rotor

Abstract

The invention discloses a manufacturing method of a micro motor rotor. The manufacturing method is completed by procedures of pulverization, pressing of a green body, sintering, grinding machining and magnetization. In the pulverization process, H3BO3, camphor, alcohol, calcium stearate, silicon dioxide, Cr, Nb and Ti are added into fine magnetic powder, so that the internal structure of a magnetic pillar of a permanent magnet rotor is improved, the coercive force and the wear resistance of a magnetic body are improved, and a magnetic field in the magnetic pillar of the rotor is uniformly distributed; powder obtained by smashing of a coarse green body and the fine powder are mixed according to a ratio, so that powder for manufacturing a magnetic pillar of the motor rotor is finally manufactured, and the smoothness of the powder is improved; therefore, the uniformity of the internal structure of the magnetic pillar of the rotor is improved, and the uniformity of the distribution of the magnetic field in the magnetic pillar of the rotor is improved; during pressing of the green body, filling and cold pressing are repeatedly performed for three times, so that the structural uniformity and the intensity of the magnetic pillar of the rotor are enhanced, and the permanent magnet performance of the magnetic pillar of the rotor is improved; and by pre-magnetization, grinding machining and then magnetization for enhancing magnetization during pressing of the green body, the permanent magnet performance of the rotor is improved.

Description

technical field [0001] The invention relates to a method for manufacturing a motor rotor, in particular to a method for manufacturing a micro-motor rotor, and belongs to the technical field of rotor manufacturing methods. Background technique [0002] The rotor is the necessary structure for the function of the motor. With the wide application of the motor, the types and structures of the motor are also varied. For some low-power occasions, the application of permanent magnet motors is more common. Permanent magnet motor rotors are usually manufactured by wet pressing or dry pressing. Due to the complex structure of wet pressing equipment and molds, it is impossible to press smaller products. Therefore, dry pressing is usually used for micro motor rotors. forming. Due to the poor orientation and fluidity of the material, the existing dry pressing molding cannot guarantee the high magnetic properties of the motor rotor, which in turn affects the performance of the permanent ...

AI Technical Summary

Problems solved by technology

Due to the poor orientation and fluidity of the material, the existing dry pressing molding cannot guarantee the high magnetic properties of the motor rotor, which in turn affects the performance of the permanent magnet motor; at the same time, the traditional motor rotor is pressed into a cylindrical shape and sintered Grinding is then carried out. During the sintering process, the rotor will be deformed, resulting in a waste of material, time-consuming and labor-intensive grinding in the later stage.