Rotor core, motor rotor, motor and automobile

The rotor core design with integrated cooling passages and grooves addresses cooling inefficiencies in conventional motors, preventing demagnetization and enhancing performance by direct coolant contact and optimized magnetic flux distribution.

JP2026522224APending Publication Date: 2026-07-07CHERY AUTOMOBILE CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
CHERY AUTOMOBILE CO LTD
Filing Date
2025-03-14
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Conventional rotor designs in interior permanent magnet synchronous motors suffer from reduced cooling efficiency due to the cooling medium being supplied from the rotor shaft, leading to increased demagnetization risk and decreased performance at high rotational speeds and power densities.

Method used

The rotor core is designed with a rotor shaft cavity and multiple cooling passages and grooves that penetrate along the axial direction, allowing direct contact between the coolant and permanent magnets for efficient heat exchange, and includes magnetic pole configurations and additional cooling passages to enhance cooling and magnetic flux distribution.

Benefits of technology

This design effectively prevents demagnetization of permanent magnets, improves cooling efficiency, enhances magnetic flux density, and increases motor performance and reliability by reducing magnetic leakage and temperature rise.

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Abstract

This application provides a rotor core (1), a motor rotor, a motor, and an automobile. The rotor core (1) is provided with a rotor shaft cavity (11), a plurality of first cooling passages (12), and a plurality of first rotor grooves (13). The rotor shaft cavity (11), the first cooling passages (12), and the first rotor grooves (13) all penetrate the rotor core (1) along its axial direction, and the plurality of first rotor grooves (13) and the plurality of first cooling passages (2) are each distributed at intervals along the circumferential direction of the rotor core (1). Each first cooling passage (12) is located between the rotor shaft cavity (11) and the first rotor groove (13), and each first rotor groove (13) communicates with the first cooling passage (12). This installation allows the cooling medium flowing through the first cooling passage to come into direct contact with the permanent magnet in the first rotor groove for heat exchange, thereby cooling the permanent magnet and preventing the risk of demagnetization due to excessively high temperatures.
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