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Paper Abstract and Keywords
Presentation 2012-12-01 13:50
Effect of Lubricant on Lifetime of Au-plated Slip-Ring and Ag-Pd-Cu Brush System for Small Electric Power -2-
Hideki Kitajima, Koichiro Sawa, Takahiro Ueno (Nippon Inst. of Tech.) EMD2012-84
Abstract (in Japanese) (See Japanese page) 
(in English) Abstract The authors have been investigating degradation process of Au plated slip ring and Ag-Pd-Cu brush system. In almost all cases the lifetime of the sliding system ends, when Au plating layer is worn out, the ring surface is oxidized to be black in color and contact resistance becomes very high. Further, the lifetime is very short without lubricant. So, the lubricant is very effective to make the lifetime longer. However, even with lubricant the lifetime is varied from about 1000 hours to almost 7000 hours in the past experiments. It is an important issue how the lubricant works on the lifetime of the system.
In this paper the effect of lubricant on the degradation process of contact resistance is focused on. In the past tests the lubricant is supplied only once before the test. In this test the lubricant is regularly supplied almost every 1000 operation hours. Consequently, the operation more than 9000 hours is realized, which is the longest among tests so far. In addition the contact voltage drop stays almost constant around 50mV and after that contact voltage drop increase gradually until 5000 hours.
According to the Element Analysis after the test the Ni base plating layer is totally exposed in many tracks. It means that the Au plating layer is gradually worn out probably at the stage of increasing voltage drop. In the previous tests the lifetime ended even when the Ni plating layer remained. So, the reason of long operation in this test is guessed to be that the lubricant not only decreases wear of ring and brush, but also suppresses oxidation of the Ni layer.
Keyword (in Japanese) (See Japanese page) 
(in English) slip ring / Au plating / Ni base plating / Ag-Pd brush / lifetime / lubricant / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 332, EMD2012-84, pp. 113-118, Nov. 2012.
Paper # EMD2012-84 
Date of Issue 2012-11-23 (EMD) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EMD  
Conference Date 2012-11-30 - 2012-12-01 
Place (in Japanese) (See Japanese page) 
Place (in English) Chiba Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) International Session IS-EMD2012 
Paper Information
Registration To EMD 
Conference Code 2012-11-EMD 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Effect of Lubricant on Lifetime of Au-plated Slip-Ring and Ag-Pd-Cu Brush System for Small Electric Power -2- 
Sub Title (in English)  
Keyword(1) slip ring  
Keyword(2) Au plating  
Keyword(3) Ni base plating  
Keyword(4) Ag-Pd brush  
Keyword(5) lifetime  
Keyword(6) lubricant  
Keyword(7)  
Keyword(8)  
1st Author's Name Hideki Kitajima  
1st Author's Affiliation Nippon Institute of Technology (Nippon Inst. of Tech.)
2nd Author's Name Koichiro Sawa  
2nd Author's Affiliation Nippon Institute of Technology (Nippon Inst. of Tech.)
3rd Author's Name Takahiro Ueno  
3rd Author's Affiliation Nippon Institute of Technology (Nippon Inst. of Tech.)
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Speaker Author-1 
Date Time 2012-12-01 13:50:00 
Presentation Time 20 minutes 
Registration for EMD 
Paper # EMD2012-84 
Volume (vol) vol.112 
Number (no) no.332 
Page pp.113-118 
#Pages 6 
Date of Issue 2012-11-23 (EMD) 

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