Rotor assemblies and synchronous machines including rotor assemblies

The rotor assembly with a hollow shaft and internal rectifier addresses damage and cooling challenges in synchronous machines, ensuring stable high-speed operation and cost-effective performance by reducing centrifugal forces and enhancing thermal management.

JP7869311B2Active Publication Date: 2026-06-02MAHLE INT GMBH
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
MAHLE INT GMBH
Filing Date
2022-09-26
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Conventional inductively electrically excited synchronous machines face issues with damage to electrical components and solder connections due to centrifugal forces and vibrations, limited component selection, increased cost, and restricted cooling due to the arrangement of rectifiers on the rotor shaft, leading to potential failure and high operational temperatures.

Method used

The rotor assembly features a hollow shaft with a rectifier positioned within the cavity, transverse to the rotation axis, reducing centrifugal forces and allowing for effective cooling through a cooling chamber and cooler, while the rectifier is fixed to the shaft to prevent mechanical damage and enhance thermal management.

Benefits of technology

The solution enables stable high-speed operation without component damage, reduces costs, and improves cooling efficiency, maintaining optimal operational temperatures and performance.

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Patent Text Reader

Abstract

The present invention relates to a rotor assembly (2) for an inductively electrically excited synchronous machine (1). The rotor assembly (2) comprises a hollow shaft (3) rotatable about a rotation axis (RA), a rotor (4) and a secondary circuit (5) of an energy transfer device (6). The secondary circuit (5) comprises a rectifier (7) having a printed circuit board (10) and at least one electrical component (11) and a secondary coil (8). The rectifier (7) according to the invention is aligned transversely to the rotation axis (RA) and is mounted in a cavity (9) of the hollow shaft (3). The present invention also relates to a synchronous machine (1) comprising the rotor assembly (2).
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