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Paper Abstract and Keywords
Presentation 2020-12-04 15:00
Sliding Current Characteristics brought about by Changes in the Silver Content of Silver Graphite Brushes.
Naoki Fukuda, Ryosuke Kudo, Yuki Saito, Yuki Kawashima, Yusuke Takada, Koichiro Sawa, Takahiro Ueno (NIT) EMD2020-22 Link to ES Tech. Rep. Archives: EMD2020-22
Abstract (in Japanese) (See Japanese page) 
(in English) Sliding contact is a mechanism for the transfer of electrical current between stationary and moving parts. To date, slip ring systems have mainly been used to provide the excitation mechanism required by turbine generators. However, more diverse systems are now needed in the current clean energy setting. For example, the slip ring systems used in wind power generators must operate at low temperatures. In contrast, automotive alternators operate at high temperatures. Moreover, slip ring systems are also used in applications that require the transmission of electrical signals, such as radar antennae and computed tomography. In such cases, silver (Ag)–graphite brushes and noble metal slip rings are often used, because they are regarded as effective at reducing contact voltage drop, even in harsh environments.
In this study previously, a 20-hour slide experiment to determine the contact voltage drop and amount of wear characteristics of Ag-graphite brushes and silver-gold (Ag-Au) slip rings was reported.
In the present paper, contact voltage drop-brush current (V-I) characteristic tests were conducted using Ag-graphite brushes (Ag content of the coating were 50, 70, and 90 wt%), and noble metal-coated slip rings (plated with silver and gold) to determine the electrical effects of contact voltage drop. The V-I characteristics revealed linearity in all the silver content brushes.
Keyword (in Japanese) (See Japanese page) 
(in English) Silver Graphite Brush / Noble Coated Slip Ring / V-I Characteristic / φ-θ Theory / Sliding Surface Temperature / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 275, EMD2020-22, pp. 24-29, Dec. 2020.
Paper # EMD2020-22 
Date of Issue 2020-11-27 (EMD) 
ISSN Online edition: ISSN 2432-6380
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Download PDF EMD2020-22 Link to ES Tech. Rep. Archives: EMD2020-22

Conference Information
Committee EMD  
Conference Date 2020-12-04 - 2020-12-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) International Session IS-EMD2020 
Paper Information
Registration To EMD 
Conference Code 2020-12-EMD 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Sliding Current Characteristics brought about by Changes in the Silver Content of Silver Graphite Brushes. 
Sub Title (in English)  
Keyword(1) Silver Graphite Brush  
Keyword(2) Noble Coated Slip Ring  
Keyword(3) V-I Characteristic  
Keyword(4) φ-θ Theory  
Keyword(5) Sliding Surface Temperature  
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Keyword(7)  
Keyword(8)  
1st Author's Name Naoki Fukuda  
1st Author's Affiliation Nippon Institute of Technology (NIT)
2nd Author's Name Ryosuke Kudo  
2nd Author's Affiliation Nippon Institute of Technology (NIT)
3rd Author's Name Yuki Saito  
3rd Author's Affiliation Nippon Institute of Technology (NIT)
4th Author's Name Yuki Kawashima  
4th Author's Affiliation Nippon Institute of Technology (NIT)
5th Author's Name Yusuke Takada  
5th Author's Affiliation Nippon Institute of Technology (NIT)
6th Author's Name Koichiro Sawa  
6th Author's Affiliation Nippon Institute of Technology (NIT)
7th Author's Name Takahiro Ueno  
7th Author's Affiliation Nippon Institute of Technology (NIT)
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Speaker Author-1 
Date Time 2020-12-04 15:00:00 
Presentation Time 25 minutes 
Registration for EMD 
Paper # EMD2020-22 
Volume (vol) vol.120 
Number (no) no.275 
Page pp.24-29 
#Pages
Date of Issue 2020-11-27 (EMD) 


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