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Electronically Variable Pressure Regulator (EVPR)A new programmable electronically variable pressure regulator (EVPR) concept accurately controls the local outlet or remote system pressure. It uses an integral pulse width modulated rare earth permanent magnet motor operating in response to redundant pressure transducer feedback signals. The EVPR is a simple single stage device that does not use dynamic seals or pilot valving. Conversion of partial revolution motor torque to poppet lifting force is accomplished by pure flexure action to avoid using bearings. The flexure drive (called the ROTAX) has a variable lead to minimize motor weight and power consumption. Breadboard tests were completed successfully on two critical design elements of the EVPR: the ROTAX and the motor. The ROTAX cable system was tested for 250,000 cycles without failure. The breadboard motor met the basic design requirements including the design torque and power consumption. Prototype parts were fabricated, and testing of the prototype EVPR has started. It is PC computer controlled to facilitate programming, data acquisition and analysis. A lightweight dedicated microprocessor is planned for the flightweight EVPR.
Document ID
19900009168
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Reinicke, R. H. (Eaton Corp. El Segundo, CA, United States)
Nelson, R. O. (Eaton Corp. El Segundo, CA, United States)
Hurlbert, E. (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1989
Publication Information
Publication: Johns Hopkins Univ., The 1989 JANNAF Propulsion Meeting, Volume 1
Subject Category
Instrumentation And Photography
Accession Number
90N18484
Funding Number(s)
CONTRACT_GRANT: NAS9-17907
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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