Magnetic ring preparation method and device

By using cubic or spherical sample magnetic powder and finite element simulation to optimize the shape and position distribution of magnetic poles, combined with bidirectional pressing and multi-gradient sintering, the problem of poor magnetic field waveform in magnetic ring preparation was solved, achieving high-precision magnetic field control and adaptability to multiple scenarios.

CN121964366APending Publication Date: 2026-05-01NINGBO JINJI STRONG MAGNETIC MATERIAL CO LTD
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Patent Information

Application Number
CN202511896346.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-16
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing magnetic ring manufacturing processes use magnetic powder raw materials with irregular morphology and do not strictly control particle size distribution. The molding stage relies on unidirectional pressing or simple multidirectional pressing, resulting in poor sine wave of magnetic field waveform and large total harmonic distortion, making it difficult to adapt to various application scenarios.

Method used

Using cubic or spherical sample magnetic powder, the shape and position distribution of magnetic poles are adjusted through finite element simulation. Combined with bidirectional pressing and multi-gradient sintering heat treatment, uniform filling and high-precision orientation control of magnetic powder are achieved.

Benefits of technology

It improves the sinusoidal nature of the magnetic field waveform, reduces total harmonic distortion, enhances the accuracy of the magnetic ring, and is suitable for various application scenarios.

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Abstract

The invention provides a magnetic ring preparation method and device. The method comprises the following steps: obtaining cubic or spherical sample magnetic powder; the particle size distribution value of the sample magnetic powder meets a first threshold value; a finite element simulation mechanism is utilized to adjust the magnetic pole shape and position distribution of the prefabricated magnetic ring, and a target magnetic field direction meeting multi-pole normal distribution is obtained; based on the target magnetic field direction and oil pump parameters, bidirectionally pressing the sample magnetic powder to form a magnetic ring green body; oil pump parameters are used for adjusting pressing or powder adding pressure; the two directions are pressing directions of the upper side and the lower side of the prefabricated magnetic ring; and performing multi-gradient sintering heat treatment on the magnetic ring green body to obtain the target magnetic ring. In conclusion, according to the technical scheme provided by the invention, the magnetic field waveform sine degree of the magnetic field finished product can be improved, the total harmonic distortion is reduced, the accuracy is improved, and the method can adapt to various application scenes.
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