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A parametric study of motor starting for a 2- to 10-kilowatt Brayton power systemA study of the motor starting of a Brayton cycle power system was conducted to provide estimates of system sensitivity to several controllable parameters. These sensitivity estimates were used as a basis for selection of an optimum motor-start scheme to be implemented on the 2- to 10-kilowatt Brayton power system designed and presently under test. The studies were conducted with an analog simulation of the Brayton power system and covered a range of frequencies from 400 Hz (33 percent design) to 1200 Hz (design), voltage-to-frequency ratios of 0.050 (50 percent design) to 0.100 (design), turbine-inlet temperatures of 800 K (1440 R, 70 percent design) to 1140 K (2060 deg R, design), and prestart pressure levels of 14.5 psia to 29.0 psia. These studies have shown the effect of selected system variables on motor starting. The final selection of motor-start variables can therefore be made on the basis of motor-start inverter complexity, battery size and weight, desired steady-state pressure level after startup, and other operational limitations. In general, the study showed the time required for motor starting to be inversely proportional to motor frequency, voltage, turbine-inlet temperature, and pressure level. An increase in any of these parameters decreases startup time.
Document ID
19720004331
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Cantoni, D. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
November 1, 1971
Subject Category
Auxiliary Systems
Report/Patent Number
NASA-TM-X-2432
E-6548
Accession Number
72N11980
Funding Number(s)
PROJECT: RTOP 112-27
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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