Preparation method for sintering permanent magnetic ferrite ring of brushless motor

Abstract

The invention discloses a preparation method for a sintering permanent magnetic ferrite ring of a brushless motor, and an objective is to provide a preparation method for a sintering permanent magnetic ferrite bead of a brushless motor, and the method improves magnetic flux density and solves a problem that cracking is easy to occur in a sintering process. The main technology comprises pre-magnetizing blank, breaking and preparing materials, drying and sintering, grinding, and magnetizing, so as to prepare and produce a multipolar magnetic ring whose peak value is 2000 Gs after magnetizing, and solve problems that the inner and outer circles of the magnetic crack caused by the difference value of shrinking percentages in a sintering process of a multipolar molded workblank body. Beneficial effects of the method are that the problems that the inner and outer circles of the magnetic crack caused by the difference value of shrinking percentages in a sintering process of the multipolar molded workblank body is solved, the method ensures the hardness of a mold cavity and service life of moulds, greatly restrains magnetic ring products from cracking in sintering, and improves magnetic flux density of a multipolar radiation magnetic ring.

Description

technical field [0001] The invention relates to the technical field related to the preparation of permanent sintered ferrite magnets, in particular to a method for preparing a sintered permanent ferrite magnetic ring of a brushless motor. Background technique [0002] With the development of magnetic technology, permanent magnet sintered ferrite magnetic rings with excellent magnetic properties with a peak flux density greater than or equal to 2000Gs and radial multi-pole magnetization are widely used in AC servo motors, DC brushless motors and other fields. In order to meet the requirements of energy saving and high efficiency, it is a trend to reduce the weight and miniaturization of electric motors. Compared with the motor composed of multiple magnetic tiles, the motor made of this kind of heterosexual ring can greatly reduce the volume and quality of the motor, and reduce the difficulty of assembly, so the high surface flux density multi-pole magnetic ring is more and mo...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the above-mentioned deficiencies in the prior art, and provides a method for preparing a brushless motor sintered permanent magnet ferrite magnetic ring that increases the magnetic flux density and solves the problem of easy cracking in the sintering process

[0007] A method for preparing sintered permanent magnet ferrite rings for brushless motors. The main process includes pre-magnetizing blanks, crushing materials, drying and sintering, grinding, and magnetizing to prepare and produce multi-pole magnets with a peak value of 2000Gs after magnetization. ring, and solve the problem of cracking of the inner and outer circles of the magnetic ring caused by the difference in shrinkage during the sintering process of the multi-pole forming blank. The specific operation steps are as follows:

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