Electro-Mechanical Actuator DC Resonant Link Controller

TITLE AND SUBTITLE:
Electro-Mechanical Actuator DC Resonant Link Controller

AUTHOR(S):
Kenneth E. Schreiner

REPORT DATE:
October 1996

FUNDING NUMBERS:
WU-242-50-05
C-NAS3-25799

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
Martin Marietta Space Systems Division
San Diego, California

PERFORMING ORGANIZATION REPORT NUMBER:
E-10372

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

REPORT TYPE AND DATES COVERED:
Final Contractor Report

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA CR-198510

SUPPLEMENTARY NOTES:
Project Manager, Mary Ellen Roth, Power Technology Division, NASA Lewis Research Center, organization code 5430, (216) 433-8061.

ABSTRACT:
This report summarizes the work performed on the 68 HP electro-mechanical actuator (EMA) system developed on NASA contract NAS3-25799 for the Electrical Actuation (ELA) Technology Bridging Program. The system was designed to demonstrate the capability of large, high power linear ELAs for applications such as Thrust Vector Control (TVC) on rocket engines. It consists of a motor controller, drive electronics and a linear actuator capable of up to 32,000 lbs loading at 7.4 inches/second. The drive electronics are based on the Resonant DC link concept and operate at a nominal frequency of 55 kHz. The induction motor is a specially designed high speed, low inertia motor capable of a 68 peak HP. The actuator was originally designed by MOOG Aerospace under an internal R & D program to meet Space Shuttle Main Engine (SSME) TVC requirements. The design was modified to meet this programs linear rate specification of 7.4 inches/second. The motor and driver were tested on a dynamometer at the Martin Marietta Space Systems facility. System frequency response, step response and force-velocity tests were conducted at the MOOG Aerospace facility. A complete description of the system and all test results can be found in the body of the report.

SUBJECT TERMS:
Electromechanical actuator; Resonant converter; Induction motor; Pulse population modulation; Launch vehicles; Thrust vector control

NUMBER OF PAGES:
377

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