Son Dong Won, Zhang Tuo, Lee Geesoo
Department of Mechanical System Engineering, Tongmyong University, Busan 48520, Korea.
Department of Automotive Engineering, Tongmyong University, Busan 48520, Korea.
Materials (Basel). 2022 Jun 27;15(13):4510. doi: 10.3390/ma15134510.
A rotating body consisting of a rotating shaft and bearings inevitably generates voltage and current. The potential difference between the bearing and the shaft is the main cause of electrical corrosion, which causes motor failure, shortened bearing life, and many safety issues. To prevent corrosion, passive shaft-grounding devices use conductive materials and brushes; however, these devices cannot be completely grounded, so there is a difference in local potential, and brush friction generates a shaft current. The cumulative effect causes electrical corrosion; therefore, in this study, an electrical corrosion protection device for the rotating power supply shaft was developed. It detected current and potential difference and established a feedback system on the rotating shaft. It also energized the rotating shaft using an external power supply to eliminate the potential difference on the shaft and reduce electrical corrosion. The result was prolonged motor life and improved stability, operating efficiency, and operability of related equipment. In this study, a rotating-shaft test rig was set up, and a constant current was applied to simulate the potential difference and verify the performance of the anti-corrosion device. Gradually, the design scheme was optimized; the potential difference on the rotating shaft was accurately quantified; and the goal of controlling the potential difference within 2 mV was achieved. Finally, the electrical corrosion protection device was applied to the rotating shaft of a merchant ship, and the current and potential difference on the rotating shaft were monitored for 30 days. The results showed that the device had excellent performance in reducing the potential difference on the rotating shaft and preventing electrical corrosion.
由旋转轴和轴承组成的旋转体不可避免地会产生电压和电流。轴承与轴之间的电位差是电腐蚀的主要原因，会导致电机故障、轴承寿命缩短以及诸多安全问题。为防止腐蚀，无源轴接地装置使用导电材料和电刷；然而，这些装置无法完全接地，因此存在局部电位差，并且电刷摩擦会产生轴电流。累积效应会导致电腐蚀；因此，在本研究中，开发了一种用于旋转电源轴的电腐蚀保护装置。它检测电流和电位差，并在旋转轴上建立反馈系统。它还使用外部电源为旋转轴供电，以消除轴上的电位差并减少电腐蚀。结果是延长了电机寿命，并提高了相关设备的稳定性、运行效率和可操作性。在本研究中，搭建了一个旋转轴试验台，并施加恒定电流以模拟电位差并验证防腐装置的性能。逐步优化设计方案；精确量化了旋转轴上的电位差；并实现了将电位差控制在2 mV以内的目标。最后，将电腐蚀保护装置应用于一艘商船的旋转轴上，并对旋转轴上的电流和电位差进行了30天的监测。结果表明，该装置在降低旋转轴上的电位差和防止电腐蚀方面具有优异的性能。
