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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

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

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Original Message:

Posted by: Chuck Ramsey ( )
Organization:ORNL Research Reactors
Date posted: Fri Sep 10 14:30:54 US/Eastern 1999
Subject: High speed gas circulator with magnetic bearings
Does anyone have or know where I can turn for recent information on the reliability and performance of high speed gas circulators, variable speed controllers, and/or magnetic bearings and their control unit? The circulators are intended operate over a speed range of 7000 to 40000 rpm in a hydrogen loop and temperatures from ambient down to 20K. Any input is greatly appreciated.


Subject: Circulator/Controller/Magnetic Bearing
Reply Posted by: Bruce Dudley ( )
Organization: Reliability Analysis Center
Date Posted: Thu Sep 23 10:30:38 US/Eastern 1999
Several years ago we at the Reliability Analysis Center analyzed an AIR CYCLE MACHINE that had controllers, magnetic bearings and circulators. The general results were: Controller -- 15,000 hour Mean-Time-Between-Failure(MTBF), Magnetic Bearings and Sensors/Coils -- 14,000 hour MTBF and Electric Pump Circulator -- 30,000 hour MTBF. Perhaps these general results will help in your analysis.

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