Rotating electric machine with air gap purging

The rotating electric machine uses an internal air channel to maintain an air-filled gap between the rotor and stator, reducing friction losses by preventing lubricant ingress and eliminating the need for additional air conveying devices.

DE102024138356A1Pending Publication Date: 2026-06-18MAN TRUCK & BUS SE
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Patent Information

Application Number
DE102024138356
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Lubricants entering the space between the rotor and stator in rotating electric machines cause significant friction losses due to high shear forces.

Method used

A rotating electric machine design featuring an internal air channel in the rotor that uses centrifugal force to convey air into the gap between the rotor and stator, preventing lubricant penetration and minimizing friction by maintaining an air-filled gap.

Benefits of technology

The air-filled gap reduces friction losses, eliminating the need for additional air conveying devices and ensuring a constant supply of oil-free air, thereby saving costs and weight.

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Abstract

The invention relates to a rotating electric machine (10) for a motor vehicle (20). The rotating electric machine (10) comprises a stator (12) and a rotor (14) with a rotor shaft (14a), a rotor body (14b) non-rotatably connected to the rotor shaft (14a), and an internal air channel (15). A gap (16) is arranged between the rotor (14) and the stator (12). Furthermore, the rotating electric machine (10) comprises a housing (18) in which the stator (12), the rotor (14), and the gap (16) are arranged, at least partially. The internal air channel (15) fluidically connects an outer chamber (30) of the housing (18) and the gap (16) to each other, for supplying air to the gap (16) and blowing lubricant out of the gap (16). Furthermore, the housing (18) has an air outlet opening (18a) for removing the supplied air from the housing (18).
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Citation Information

Patent Citations

  • Electric machine

    DE102021200283A1

  • Motor unit with reduced friction

    DE102022128325B4