Motors and Electric Drive Systems
The motor design with a conductive portion, elastic body, and fastening member addresses the expense and inefficiency of existing methods by ensuring reliable axial current removal and preventing electrical corrosion with a cost-effective, simple structure.
JP7828475B2Active Publication Date: 2026-03-11JING JIN ELECTRIC TECH CO LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2023-03-30
- Publication Date
- 2026-03-11
AI Technical Summary
Technical Problem
Existing methods for preventing shaft current flow in new energy vehicle motors, such as using insulating bearings or conductive grease, are expensive and do not fully address the issue of electrical corrosion between the motor shaft and housing.
Method used
A motor design incorporating a conductive portion, elastic body, and fastening member to guide axial current from the motor shaft to the motor end cover, ensuring constant contact and reliable electrical conduction even during rotation.
Benefits of technology
The solution provides effective axial current removal with a simple, low-cost structure that maintains consistent contact and reliability despite axial movement, reducing the risk of electrical corrosion.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 0007828475000001 
Figure 0007828475000002
Abstract
The present application relates to a motor, the motor comprising a motor shaft, a motor end cover, a conductive part, an elastic body and a fastening member, the motor shaft has a pointed hole at its end, the motor end cover has a passage leading to the pointed hole, the conductive part is mounted in the passage, the conductive part abuts against an inner ring of the pointed hole, the elastic body is mounted in the passage, the elastic body abuts against the conductive part, the fastening member abuts against the elastic body, and the fastening member is connected to the passage, so that an axial current induced in the motor shaft is led to the motor end cover through the conductive part, the elastic body and the fastening member in order. The axial current is led through the conductive part and the inner ring of the pointed hole, and the motor shaft can achieve contact with a constant area during the rotation process, so that the axial current is effectively removed. The present application also relates to an electric drive system having the motor.
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Citation Information
Patent Citations
Electrolytic-corrosion preventing unit for wheel driving device, and wheel driving device
JP2011135722A
Vehicle axis grounding device
JP2019192492A
Motor shaft discharge device
US5804903A
Auxiliary bearing assembly for reduction of unwanted shaft voltages in an electric motor
US5914547A