Shaft-end structure preventing electrical corrosion in bearings, and motor

By setting a PCB board and contact seat inside the shaft end housing, a new parallel circuit is formed, which solves the problems of difficult operation and high cost in bearing electro-corrosion protection, realizes low-cost and low-risk bearing protection, and extends the service life of motors and fans.

WO2026124125A1PCT designated stage Publication Date: 2026-06-18GUANGDONG SHENGHUI TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
GUANGDONG SHENGHUI TECHNOLOGY CO LTD
Filing Date
2025-11-17
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

In the existing technology, the bearing electro-corrosion protection scheme has problems such as difficult operation, high cost and high potential risks. Especially when the PWM inverter drives the motor, the bearing is easily damaged by electro-corrosion, which affects the service life of the motor and fan.

⚗Method used

By setting a PCB board and contact seat inside the shaft end housing, a new parallel circuit is formed, changing the connection method between the output shaft and the connecting bearing and the external power supply equipment. The voltage and current are released by using external terminals, isolating parasitic capacitance from the shaft end drive assembly, reducing shaft current, and protecting the bearing from electro-corrosion.

🎯Benefits of technology

It achieves simple and low-cost bearing protection, avoids the need for regular component replacement and additional losses, reduces bearing current, avoids potential damage risks caused by external power supply equipment failure, and extends the service life of motors and fans.

✦ Generated by Eureka AI based on patent content.

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    Figure CN2025135394_18062026_PF_FP_ABST
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Abstract

A shaft-end structure preventing electrical corrosion in bearings, and a motor. The shaft-end structure comprises a shaft-end housing (1) mounted on an external working member (4) and a PCB board mounted inside the shaft-end housing (1), wherein a contact base is provided on the PCB board, a shaft-end drive assembly (2) is mounted on the contact base, and the shaft-end drive assembly (2) comprises an output shaft (21) and connection bearings (22); and the shaft-end structure further comprises a wiring terminal group, the wiring terminal group comprising an external wiring terminal and a ground wiring terminal. The motor comprises the shaft-end structure, a motor support (3), and the external working member (4), wherein the shaft-end housing (1) is mounted on the motor support (3), and the external working member (4) is mounted on the output shaft (21). The shaft-end structure preventing electrical corrosion in bearings and the motor solve the problem that operation is difficult, costs are high, and potential risk is high in bearing electrical corrosion protection solutions in the prior art.
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