Bearing condition detection device, rotating electrical machine, and bearing condition detection method

JPWO2026013934A1Active Publication Date: 2026-01-15MITSUBISHI ELECTRIC CORP
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Patent Information

Application Number
JP2025514732
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-10
Filing Date
2024-10-03
Publication Date
2026-01-15
Estimated Expiration
2044-10-03

AI Technical Summary

Technical Problem

Existing methods for detecting shaft current in rotating electric machines are hindered by the need for additional equipment, increased component count, and reduced detection sensitivity due to the requirement for magnetizing the bearing and combining multiple sensors.

Method used

A cylindrical bearing condition detection device that supports the shaft of a rotating electric machine's rotor, equipped with a sensor to measure magnetic or electric fields and a shaft current detection unit, arranged to face the axial end faces of the bearing, allowing for high-sensitivity detection of shaft current without additional components.

Benefits of technology

The solution enables high-sensitivity detection of shaft current without increasing the number of components, thereby improving the reliability of rotating electric machines by accurately monitoring bearing conditions.

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Abstract

The bearing condition detection device (200) of the present disclosure includes a sensor (50) that measures at least one of a magnetic field and an electric field around a bearing (20) that has a cylindrical shape and supports a shaft (12) of a rotor (10) of a rotating electric machine (100) on an inner peripheral surface, and a shaft current detection unit (70) that detects a shaft current flowing through the bearing (20) based on a signal from the sensor (50). The sensor (50) is arranged to face at least one end surface (20fe) of both end surfaces in the axial direction of the bearing (20).
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