Multipole magnetic rings and motors

By using an integrally molded multi-pole magnetic ring and rotor assembly injection molding inserts, the problem of inconsistent thermal expansion coefficients between the permanent magnet and the housing is solved, achieving improved magnetic performance of the motor with high efficiency, lightweight design, and low cost.

CN224289414UActive Publication Date: 2026-05-26ANHUI AOCHUANGDA TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ANHUI AOCHUANGDA TECHNOLOGY CO LTD
Filing Date
2025-07-18
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the existing permanent magnet brushless DC motor rotor structure, the inconsistency of the thermal expansion coefficients of the permanent magnet and the housing leads to internal cracks caused by thermal expansion and contraction. In addition, a metal housing is required to conduct the magnetism, resulting in eddy current losses and reduced motor efficiency. The structure is complex, heavy, and the assembly process is complicated and costly.

Method used

The system adopts a one-piece molded multi-pole magnetic ring with an anti-rotation structure on the main body. It is connected to the rotor assembly through injection molding inserts, avoiding the high-temperature curing process and achieving a firm connection between the magnetic ring and the rotor assembly, thus simplifying the assembly process.

Benefits of technology

It improves the magnetic properties and efficiency of the motor, reduces weight and cost, simplifies the assembly process, avoids magnet detachment and eddy current losses, and achieves lightweighting and cost reduction of the motor.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model provides a multi-pole magnetic ring and a motor, relating to the technical field of motors. The multi-pole magnetic ring includes a magnetic ring body, which is integrally molded. The inner or outer arc surface of the magnetic ring body is the working surface, and an anti-rotation structure is provided on the non-working surface of the magnetic ring body. The anti-rotation structure is used to connect with the injection-molded body during the injection molding of the magnetic ring body. The multi-pole magnetic ring provided by this utility model has an anti-rotation structure on its magnetic ring body. The magnetic ring body is injection molded with a rotor assembly body, and the anti-rotation structure is embedded in the rotor assembly body, enabling the magnetic ring and the rotor assembly body to rotate synchronously. Since the magnetic ring is embedded into the rotor assembly body during injection molding, it ensures a firm connection between the magnetic ring and the rotor assembly body, and eliminates the need for a high-temperature curing process with adhesive, thus avoiding the problem of the magnetic ring detaching from the rotor assembly body.
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