Improving Signal Transmission Quality of Wind Turbine Pitch Slip Ring With Copper Matrix Composites

Abstract

To improve the signal transmission quality, copper matrix composites added with different contents of carbon nanotubes (CNTs) and molybdenum disulfide (MoS2) were prepared. The electrical and tribological properties of composites were studied. A new parameter, the correlation dimension of electrical noise, was proposed to quantitatively characterize the stability of signal transmission. Copper matrix composites added with reasonable amount of CNTs and MoS2 can effectively reduce the values and fluctuations of friction coefficient and improve the wear resistance, efficiency, and stability of the signal transmission. Tribo-films are generated on the surface of composites. The contents of CNTs and MoS2 affect the stability of tribo-film and further affect the signal transmission quality. 0.5 wt% CNTs and 15 wt% MoS2 can make good synergistic effects on improving the signal transmission quality of composites. The results provide good guidance to improve the signal transmission quality of wind pitch slip rings.