Electric motor stator with an oil-cooled coil system.

The electric motor stator with a redesigned oil cooling system, featuring parallel oil circulation around each coil, addresses issues of non-homogeneous cooling and increased pressure, enhancing cooling efficiency and reliability.

FR3117706B1Active Publication Date: 2025-05-02WHYLOT SAS CALFATECH
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Patent Information

Application Number
FR2020013016
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-12-10
Publication Date
2025-05-02
Estimated Expiration
2040-12-10

AI Technical Summary

Technical Problem

Existing oil cooling systems for electric motor stators suffer from non-homogeneous cooling, increased oil pressure, and load losses, which lead to inefficient heat transfer and reliability issues.

Method used

The proposed solution involves an electric motor stator with a redesigned oil cooling system, where each coil is associated with at least one input orifice, and oil flows circulate mainly in the spacing between coils, ensuring parallel and simultaneous oil circulation around each coil.

Benefits of technology

This approach achieves homogeneous cooling of coils, reduces flow resistance and oil pressure, and minimizes load losses, resulting in improved cooling efficiency and reliability of the electric motor stator.

✦ Generated by Eureka AI based on patent content.

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Abstract

Electric motor stator comprising an oil-cooling system for the coils. The invention relates to an electric motor stator equipped with coils (3, 3a, 3b) and comprising an oil-cooling system for the coils. The coils (3, 3a, 3b) are arranged with a spacing (15) between them and defining internal and external circumferences. The system includes oil inlet and outlet manifolds with orifices for sending or receiving oil to or from the coils. Each inlet port (10) is associated with a respective coil (3, 3a, 3b), one of the manifolds encircling the inner circumference while the other encircles the outer circumference. An oil flow exiting each inlet port (10) circulates predominantly within the gap (15) between its associated coil (3) and at least one of the two adjacent coils (3a, 3b), then exits through an outlet port. (See diagram: FIGURE 2)
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