Rotary electric machine rotor

The rotor core's innovative design with laminated steel plates and strategically placed slits in the refrigerant passages addresses the issue of surface pressure and maintains cooling efficiency in rotating electric machines.

JP2025136083APending Publication Date: 2025-09-19TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2024034277
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-06
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

Existing rotating electric machine rotors face issues with surface pressure when the rotor shaft is inserted into the rotor core, which can lead to scraping, and this interference compromises the cooling performance due to the limited shape of stress relief slits in the refrigerant passages.

Method used

The rotor core is designed with laminated steel plates and includes a first and second refrigerant passage, with slits formed in regions where the second passage is not present, allowing for reduced surface pressure and maintaining cooling efficiency by avoiding interference.

Benefits of technology

This design effectively reduces surface pressure during rotor shaft insertion while preserving cooling performance by minimizing interference between the slits and refrigerant passages, ensuring a flexible shape for improved surface pressure reduction.

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Abstract

To provide a rotary electric machine rotor capable of improving a bearing reduction effect in rotor shaft insertion into a rotor core while maintaining a cooling performance.SOLUTION: A rotary electric machine rotor comprises: a rotor core consisting of stacked steel plates; a first coolant path formed to extend in an axial direction inside of the rotor core; a second coolant path formed to communicate a coolant supply port of a shaft hole, in which a rotor shaft is inserted, with the first coolant path; and a slit formed to extend in the axial direction in the vicinity of the shaft hole in a region, where the second coolant path is not present in a view in a direction vertical to the axial direction, inside of the rotor core.SELECTED DRAWING: Figure 1
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