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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Peter Jolly (peter.jolly@carrier.utc.com )
Organization:Carrier Refrigeration
Date posted: Thu Apr 6 23:44:07 US/Eastern 2000
Subject: Rebaility Data for Electric Motors and Compressors
Message:
I am working on a project to reduce product qualification time. I am looking at accelerated life cycle testing techniques. I am seeking data(MTBF or Weibull beta's and eta's) on electric motors (DC, BLDC, Induction and SR, all <1 hp) and compressors. Any papers referring to the physics-of-failure would also be useful. Thanks


Reply:

Subject: Electric Motor Life Testing
Reply Posted by: Bruce Dudley (bdudley@alionscience.com )
Organization: Reliability analysis Center
Date Posted: Wed Apr 12 9:18:44 US/Eastern 2000
Message:
In 1977, the Shaker Research Corporation performed an indepth examination of electric motor reliability. The results of this study were reported in the technical report, RADC-TR-77-408 "Electic Motor Reliability Model", December 1977. This report was authored by Mr. D. S. Wilson and Mr. R. Smith and it includes test and field data that was analyzed to construct reliability models. Part of the analysis included the evaluation of Weibull slope or the beta parameter. The information collected indicates that winding slope at less than 125 degrees C is 1.09, at temperatures greater than 125 degrees C the slope is 2.33. The bearing slope for all temperatures was 2.88. This report may be ordered through the National Technical Information Services at 5285 Port Royal Road, Springfield, VA 22161.


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