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The influence of rotational speed on electrical corrosion mechanisms in rolling element bearings was inves tigated through a combination of elastohydrodynamic lubrication (EHL) theory and experimental analysis. Minimum lubricant film thickness and the lubrication parameter (λ) were calculated using the Hamrock–Dowson equation under three rotational speeds of 100, 300, and 900 rpm. The theoretical results indicated that increasing rotational speed sig nificantly increased the minimum film thickness, resulting in a transition from boundary to mixed lubrication. To verify the resulting damage characteristics, electrical corrosion experiments were conducted using a custom-built rotorkit system under identical electrical and mechanical conditions. Surface damage on the inner race and rolling elements was analyzed using confocal laser scanning microscopy. At low rotational speed (100 rpm), the relatively thin lubricant film allowed fre quent micro electrical discharges, producing numerous small pits distributed across the raceway surface. In contrast, at high rotational speed (900 rpm), the thicker lubricant film reduced direct mechanical contact and surface roughness, but increased the number of, though weaker, electrical discharges, leading to larger pits and early-stage fluting patterns. Quan titative analysis showed that surface roughness decreased with increasing speed, confirming reduced mechanical wear.
These results indicate that low-speed conditions are dominated by mechanical wear combined with micro-discharges, whereas high-speed conditions are governed primarily by electrical corrosion mechanisms. The findings provide important insights for predicting bearing damage and improving durability in electric drive systems.| 기사명 | 저자명 | 페이지 | 원문 | 목차 |
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| 패키지 인쇄 용지의 접촉 마찰 특성 규명 및 표면 마모 개선에 관한 연구 = Investigation of the friction characteristics and improvement in the wear resistance of printed paper for use in packaging | 이현석, 마혁재, 이지민, 김대은 | p. 1-9 | ||
| 회전속도 변화에 따른 베어링 전식 메커니즘 = Electrical corrosion mechanisms of bearings under varying rotational speeds | 위장엽, 강성민, 김용탁, 양승준, 박경렬, 정경은, 김현종, 이경준 | p. 10-16 | ||
| 알루미늄 6061시편의 표면 거칠기에 따른 페인트 마모 양상 = Effect of surface roughness on paint wear behavior of aluminum 6061 specimens | 노수민, 김현종, 이소라, 류기범, 강성민, 정경은, 이창우, 하태웅, 이경준 | p. 17-22 | ||
| 윤활면의 실시간 시각화를 위한 도립형 트라이보미터 개발 = Development of inverted tribometer for visualization of lubricated interfaces | 이지민, 이상훈, 김현준 | p. 23-26 |
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