Fixing structure of inner rotor magnet

By combining the motor shaft, rotor core, and fixing clips, the reliability and stability issues of the inner rotor magnet fixing structure are solved, achieving vibration absorption, improved heat dissipation efficiency, and assembly eccentricity control, thereby enhancing the motor's operational stability and performance.

CN224401235UActive Publication Date: 2026-06-23王兰花 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
王兰花
Filing Date
2025-07-30
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing internal rotor magnet fixing structures have shortcomings in terms of reliability, stability, and manufacturing complexity. They are particularly problematic in high-efficiency, high-speed motors, exhibiting issues such as significant centrifugal force influence, uneven thermal expansion, and poor dynamic balance.

Method used

It adopts a combination structure of motor shaft, rotor core, magnet and fixing clip. The fixing clip is composed of six thin plates, cantilever springs and serrations. Axial limiting and vibration absorption are achieved through interference fit and elastic deformation. The serrated structure increases friction and heat dissipation efficiency.

Benefits of technology

It reduces vibration transmission rate, increases assembly eccentricity, reduces contact pressure differences, improves heat dissipation efficiency and assembly efficiency, and ensures the integrity of the magnet and reduces noise of the motor under high load.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of fixing structure of inner rotor magnet, the fixing structure includes motor shaft, rotor core, magnet and fixed clip, the outer surface of motor shaft is evenly distributed with multiple pressing ribs along the axial direction, multiple pressing ribs are used to with the six petal sheet center hole structure of fixed clip interference fit;Multiple installation grooves are evenly provided on the outer circumference of rotor core, multiple installation grooves are used to accommodate multiple the magnet;Fixed clip includes six petal sheet, cantilever spring piece and sawtooth;The end of six petal sheet is inclined to horizontal plane 5-10 °;Cantilever spring piece is distributed in the outer ring part of fixed clip, and cantilever spring piece is V-shaped bending structure;The sawtooth is located in the outer circle edge of fixed clip, and sawtooth contacts the magnet, so that magnet axial limit position.The fixing structure provided by the utility model has the advantages of simple structure, easy installation, vibration absorption, elastic fixing, eccentric force control, magnetic field pulsation, improved heat dissipation and the like.
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