CENTRIFUGAL FAN AND ROTATING ELECTRIC MACHINE

FR3110204B1Active Publication Date: 2026-03-27MITSUBISHI ELECTRIC CORP
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Patent Information

Application Number
FR2021004689
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-05-12
Filing Date
2021-05-04
Publication Date
2026-03-27
Estimated Expiration
2041-05-04

AI Technical Summary

Technical Problem

Existing centrifugal fans for cooling systems in rotating electric machines, such as vehicle-mounted alternating current generators, face limitations in airflow characteristics and noise reduction, with previous designs either focusing on improving airflow in one direction at the expense of the other or failing to enhance both simultaneously.

Method used

The centrifugal fan design incorporates blades with a bent portion that is depressed in the direction of rotation, featuring a curved shape that increases airflow in the axial direction while maintaining airflow in the centrifugal direction, reducing noise by adjusting the curvature and positioning of the bent portion to minimize air cutting.

Benefits of technology

The redesigned centrifugal fan enhances airflow in both axial and centrifugal directions, improving cooling performance and reducing noise, thereby increasing the efficiency and cooling capacity of rotating electric machines.

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Abstract

A centrifugal fan (1) included in a rotating electrical machine or similar device is configured with a main plate (2) having a multitude of plate-shaped blades (4) arranged in a ring shape around a periphery of an axis of rotation and formed in such a way that their diameter increases from front to back in a direction of rotation. The blade (4) is provided erected from an arm-shaped plate (3) projecting from one side of the main plate (2). At least one of the multitude of blades (4) has a curved portion (4c) in a portion of the face configuring the blade (4), and a region of the blade (4) in which the curved portion (4c) is provided is formed in a forward-facing shape in the direction of rotation. Figure for the abbreviation: Figure 1
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