Voltage Saturation Mechanism in V-I Characteristics for Natural Graphite Brush and Steel Slip-ring

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

doi:10.1541/ieejias.140.117

Cited by 1 publication

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“…This section presents the verification of the energization characteristics of the brush/slip ring interface. First, a V-I characteristic test was carried out, and from the results, the temperature rise at the contact surface between the brush and slip ring was estimated using φ-θ theory (19) (20) . The relationship between the Ag content of the brush and slip-ring contact-surface temperature and the a-spot (true contact area) was then considered.…”

Section: Observing the Layer Condition Of The Sliding Surface Of The ...mentioning

confidence: 99%

Mechanism of the Sliding Contact of a Ag-Graphite Brush against a Au-plated Slip Ring for Varying Ag Content

Fukuda,

Sawa,

Aoyagi

et al. 2024

IEEJ Journal IA

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Brushes enable the transfer of electrical current between stationary and moving conductors. Typical contacting components are a brush and commutator in direct-current machines and a brush and slip ring in alternating-current machines. In recent years, Aggraphite brushes and noble-metal-coated slip rings have often been applied. However, there are many aspects concerning the sliding contact of these components that require clarification. This paper focuses on characteristics relating to the brush wear and contact voltage drop of Ag-graphite brushes when the Ag content is varied for a Au-plated slip ring. In this study, we conducted sliding tests, using Ag-graphite brushes (coated with Ag contents of 50, 60, 70, 80, and 90 wt%) and a Au-coated slip ring. The results showed the effects of the interposing layer on the brush wear and drop in contact voltage. In particular, there were three distinct compositional zones, namely a zone where the effect of graphite was dominant (Ag content of the brush of 50 wt%), a zone where both the graphite and Ag powder had influence (60-80 wt%), and a zone where the effect of Ag powder was dominant (90 wt%).

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Section: Observing the Layer Condition Of The Sliding Surface Of The ...mentioning

confidence: 99%

Mechanism of the Sliding Contact of a Ag-Graphite Brush against a Au-plated Slip Ring for Varying Ag Content

Fukuda,

Sawa,

Aoyagi

et al. 2024

IEEJ Journal IA

Self Cite

View full text Add to dashboard Cite

show abstract

Voltage Saturation Mechanism in V-I Characteristics for Natural Graphite Brush and Steel Slip-ring

Cited by 1 publication

References 2 publications

Mechanism of the Sliding Contact of a Ag-Graphite Brush against a Au-plated Slip Ring for Varying Ag Content

Mechanism of the Sliding Contact of a Ag-Graphite Brush against a Au-plated Slip Ring for Varying Ag Content

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