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An electromechanical actuation system for an expendable launch vehicleA major effort at NASA-Lewis in recent years has been to develop electro-mechanical actuators (EMA's) to replace the hydraulic systems used for thrust vector control (TVC) on launch vehicles. This is an attempt to overcome the inherent inefficiencies and costs associated with the existing hydraulic structures. General Dynamics Space Systems Division, under contract to NASA Lewis, is developing 18.6 kW (25 hp), 29.8 kW (40 hp), and 52.2 kW (70 hp) peak EMA systems to meet the power demands for TVC on a family of vehicles developed for the National Launch System. These systems utilize a pulse population modulated converter and field-oriented control scheme to obtain independent control of both the voltage and frequency. These techniques allow an induction motor to be operated at its maximum torque at all times.
Document ID
19930041894
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Burrows, Linda M.
(NASA Lewis Research Center Cleveland, OH, United States)
Roth, Mary E.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 1 (A93-25851 09-44)
Publisher: Society of Automotive Engineers, Inc.
Subject Category
Launch Vehicles And Space Vehicles
Accession Number
93A25891
Funding Number(s)
PROJECT: RTOP 506-41-41
Distribution Limits
Public
Copyright
Other

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