Study on V-I Characteristic in Natural Graphite Brush vs Steel Slip Ring System

Amada, Yuki; Sawa, Kôichiro; Ueno, Takahiro; Morita, Noboru

doi:10.1109/holm.2018.8611636

Cited by 5 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where 𝜎 v1 means the viscous friction slope factor; 𝜎 v2 is the viscous friction change factor. When velocity v = 300 r∕ min, 600 r∕ min, 900 r∕ min, 1200 r∕ min, contact pressure F = 20 N, contact current I = 25 A, salt spray concentration C = 5%, and experimental ambient temperature T = 40 0 C, the corresponding friction force at different speeds was measured by formula (16).…”

Section: Improved Coulomb-viscous Friction Modelmentioning

confidence: 99%

“…A past study [15] found lubricating oil can affect the voltage–current characteristics. The voltage–current characteristics between graphite brushes and different slip rings were studied in the literature [16], showing that the steel slip rings voltage saturation characteristics were very different from copper slip rings. One research group [17] reduced wear by covering copper slip‐ring surface with molybdenum disulphide.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon brush wear calculation in marine environment based on temperature field analysis

Shaokui

Cheng

2022

IET Renewable Power Gen

View full text Add to dashboard Cite

In the marine environment, the working environment of the doubly fed wind generator carbon brush and slip-ring system is complicated, salt spray deposits and seawater erosion affect the temperature field and contact surface friction factor leading to carbon brush wear increase and shortened replacement cycle. The three-dimensional temperature field simulation model of the carbon brush and slip-ring system is established. The main factors affecting the carbon brush and slip-ring system temperature field are sliding velocity, load current, ambient temperature, contact surface condition and contact pressure applied to the brush. Wear capacity of carbon brushes is affected by contact surface temperature. An experimental platform combined with the salt spray test machine was built to carry out the contact current, contact pressure, salt spray concentration and experimental temperature experiment. The improved Coulomb-viscous friction force model was used for the wear prediction model. The sliding velocity, contact pressure, contact current, experimental temperature and salt spray concentration were introduced into the model. The experimental verification has shown that the prediction model can effectively predict the carbon brush wearing capacity under different conditions. This model can be applied to formulating the carbon brush wear amount and replacement cycle in the marine environment reducing operation and maintenance costs.

show abstract

Section: Improved Coulomb-viscous Friction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon brush wear calculation in marine environment based on temperature field analysis

Shaokui

Cheng

2022

IET Renewable Power Gen

View full text Add to dashboard Cite

show abstract

“…Lubricating oil can affect the carbon brush slip ring voltage-current characteristics. A study [18] focused on the voltage-current characteristics of a graphite carbon brush, steel slip ring and copper slip ring. The study indicated that the steel slip ring voltage saturated characteristics are quite different from that of a copper slip ring.…”

Section: Introductionmentioning

confidence: 99%

Study of Carbon Brush and Slip-Ring System Abrasion From Electric Contact Friction Under Special Environments

Shaokui

Jiang

et al. 2021

IEEE Access

View full text Add to dashboard Cite

In a marine environment, the working conditions for carbon brush and slip-ring system are complicated, leading to carbon brush abrasion and a shortened replacement cycle. A research and experiment platform using a salt spraying tester has been established to study abrasion on the carbon brush and slip-ring system of a Doubly-fed machine. We conducted tests on the carbon brush and slip-ring system contact current, contact pressure, concentration of salt spray, and the experimental temperature. The improved Coulomb-viscous friction model was adopted for modelling the carbon brush abrasion. The contact current, contact pressure, salt spray concentration and temperature were introduced as the test conditions for the forecast model, and the unknown model parameters were identified through the least square method. MATLAB was utilized to fit the nonlinear model parameters using the carbon brush abrasion prediction model results. The residual error plot and test data fitting indicated that the prediction model could effectively forecast the carbon brush abrasion loss under various conditions.INDEX TERMS Carbon brush and slip-ring system; salt spray test; prediction of abrasion; contact friction

show abstract