Rotor for axial flux electric machine with reduced cross-section radial arm portion

The rotor design for axial flux electrical machines addresses the challenges of rotor warming and magnet position maintenance by incorporating radial arms with reduced sections and circumferential blocking means, resulting in improved cooling efficiency and mechanical resistance.

FR3153478A1Active Publication Date: 2025-03-28IFP ENERGIES NOUVELLES
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Patent Information

Application Number
FR2023010207
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-26
Publication Date
2025-03-28
Estimated Expiration
2043-09-26

AI Technical Summary

Technical Problem

Existing axial flow electrical machines face challenges in limiting rotor warming, reducing rotor losses, facilitating cooling, maintaining magnet position, while maintaining sufficient rigidity to prevent vibration, noise, and surface sailing phenomena.

Method used

A rotor design for axial flux electrical machines featuring a metallic rotor disk with permanent magnets, radial arms with reduced section portions, and circumferential blocking means to maintain magnet position, along with cooling channels and overmolding to enhance cooling and reduce material volume.

Benefits of technology

The design effectively reduces rotor warming, improves cooling efficiency, maintains magnet position, and enhances the mechanical resistance of the rotor, leading to improved performance and reduced losses in the electrical machine.

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Abstract

The present invention relates to a rotor (1) for an axial flux electric machine comprising a rotor disk (2) made of metallic material and permanent magnets (4), the rotor disk (2) comprising housings (5) in which the permanent magnets (4) are positioned. The rotor disk (2) comprises radial arms (17) separating said housings (5) and radial and circumferential locking means for locking the permanent magnets (4) radially and circumferentially in position within the rotor disk (2). Furthermore, each radial arm (17) comprises at least a first portion whose axial thickness is strictly less than the thickness of the rotor disk and / or whose circumferential width is strictly less than the circumferential widths in the second and third portions of the radial arm. The invention also relates to an electric machine with such a rotor. Figure 1 to be published
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