An external rotor heat dissipation structure and a motor

By setting a cylindrical outer ring and inner ring groove on the outer periphery of the external rotor motor, with the inclined slot holes facing opposite directions, the problem of low heat dissipation efficiency of the external rotor motor at high speed is solved, and efficient heat dissipation of the rotor is achieved.

CN224459427UActive Publication Date: 2026-07-03WOLONG ELECTRIC GRP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
WOLONG ELECTRIC GRP CO LTD
Filing Date
2025-07-17
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional external rotor motors have low heat dissipation efficiency at high speeds, especially at speeds >3000rpm, where the temperature difference between the inside and outside of the rotor can reach over 45K, resulting in insufficient heat dissipation.

Method used

An external rotor flow-guiding heat dissipation structure is designed, which includes setting an outer ring and an inner ring groove on the outer shell body of the rotor. The grooves are respectively provided with inclined slot holes on both sides, and the inclined slot holes face opposite directions to form a cylindrical structure. The airflow can quickly enter and exit during the forward and reverse rotation of the rotor, thereby improving the heat dissipation efficiency.

Benefits of technology

Regardless of whether the motor rotor rotates forward or backward, the external rotor cooling structure can guide airflow to quickly enter the rotor to absorb heat and then discharge it, significantly improving the rotor's heat dissipation efficiency.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224459427U_ABST
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Abstract

This utility model discloses an external rotor heat dissipation structure and a motor, relating to the field of motor technology. The external rotor heat dissipation structure includes: a housing body, which includes a sidewall fitted around the outer periphery of the rotor and a bottom plate covering the rotor end face; the bottom plate includes an outer ring surface and an inner ring surface. The outer ring surface has a plurality of outer ring first grooves on its outer side, and the inner ring surface has a plurality of inner ring first grooves on its outer side. A first oblique slot is provided on one side of each outer ring first groove, and a second oblique slot is provided on the side of each inner ring first groove opposite to the first oblique slot. The first and second oblique slots face opposite directions. With this configuration, regardless of whether the motor rotor rotates forward or backward, the external rotor heat dissipation structure can always guide airflow to quickly enter the rotor to absorb heat and then quickly dissipate it, improving the rotor's heat dissipation efficiency.
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