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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: Bob Valerius (robert_m_valerius@mail.northgrum.com )
Organization:Northrop-Grumman Oceanic Systems
Date posted: Tue Sep 28 9:20:58 US/Eastern 1999
Subject: Reliability of Servo Valve Torque Motors
Message:
Hi, Does anyone have any info regarding torque motors and how to model them? Thanks in advance.


Reply:

Bruce Dudley Subject: Torque Motors
Reply Posted by: (bdudley@alionscience.com )
Organization: Reliability Analysis Center
Date Posted: Thu Sep 30 10:24:47 US/Eastern 1999
Message:
In general, electric motors are modeled for reliability considering the two most common failure causes which are winding and bearing failures. Mil-Hdbk-217 has reliability models for these two failure conditions and are based on the wear-out characteristics for each of the failure modes. If control electronics are included with the motor, then a reliability analysis of the electronic components or use of reliability test data needs to be accomplished. Electronic component failure rates are avialable from many sources including the RAC's Electronic Reliability Parts Data Book.


Reply:

Subject: Electric motors and alternators
Reply Posted by: Brent Wolford (bwolford@netsync.net )
Date Posted: Thu Oct 5 15:34:22 US/Eastern 2000
Message:
If someone could mail me the answer to this, I would appreciate it. I know very little about this and would like to know the answer. Why can't an electric motor running a machine from a battery be hooked up to a device to recharge the battery as the electric motor runs. I know this can be done with the alternator in a car, but why not on an electric car. I know this is elementary, but I would like to know the answer. Brent Wolford bwolford@netsync.net


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