NTRS - NASA Technical Reports Server

Back to Results
"Long life" DC brush motor for use on the Mars surveyor programDC brush motors have several qualities which make them very attractive for space flight applications. Their mechanical commutation is simple and lightweight, requiring no external sensing and control in order to function properly. They are extremely efficient in converting electrical energy into mechanical energy. Efficiencies over 80% are not uncommon, resulting in high power throughput to weight ratios. However, the inherent unreliability and short life of sliding electrical contacts, especially in vacuum, have driven previous programs to utilize complex brushless DC or the less efficient stepper motors. The Mars Surveyor Program (MSP'98) and the Shuttle Radar Topography Mission (SRTM) have developed a reliable "long life" brush type DC motor for operation in low temperature, low pressure CO2 and N2, utilizing silver-graphite brushes. The original intent was to utilize this same motor for SRTM's space operation, but the results thus far have been unsatisfactory in vacuum. This paper describes the design, test, and results of this development.
Document ID
Document Type
Conference Paper
Braun, David (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Noon, Don (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Date Acquired
August 18, 2013
Publication Date
May 1, 1998
Publication Information
Publication: 32nd aerospace mechanisms symposium
Subject Category
Electronics and Electrical Engineering
Distribution Limits
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19980193156Analytic Primary32nd Aerospace Mechanisms Symposium
Document Inquiry