PERFORMANCE OF SUPERCONDUCTING MAGNETIC BEARINGS IN AN ADVANCED MOMENTUM EXCHANGE EFFECTOR

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 6789
Amount: $488,400.00
Phase: Phase II
Program: SBIR
Awards Year: 1989
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
71 Rogers St, Cambridge, MA, 02142
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr James R Downer
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
ANGULAR MOMENTUM EXCHANGE EFFECTORS HAVE SEVERAL ADVANTAGES OVER THRUSTERS. THESE INCLUDE REDUCED MAINTENANCE (FLUID MUST BE PERIODICALLY REPLACED) AND IMPROVED COMPATIBILITY WITH OPTICS (NO EFFLUENTS). HIGH-RATE SLEWING OF LARGE PAYLOADS, HOWEVER, WILL REQUIRE TORQUES (TENS OF THOUSANDS OF NEWTON-METERS) AND ANGULAR MOMENTUM STORAGE CAPACITIES (TENS OF THOUSANDS OF NEWTON-METER-SECONDS) THAT ARE LARGE IN COMPARISON TO THE CAPABILITIES OF AVAILABLE ANGULARMOMENTUM EXCHANGE HARDWARE. ONE REASON IS THAT HIGH TORQUE PRODUCES AN EXTREMELY DIFFICULT DESIGN CONSTRAINT FOR HIGH INSTRUMENT-GRADE MECHANICAL BEARINGS AND CONVENTIONAL MAGNETIC BEARINGS. FOR CONVENTIONAL MAGNETIC BEARINGS, HIGHTORQUES REQUIRE THAT THE MAGNETIC STRUCTURE BE EXCESSIVELY MASSIVE. AN ALTERNATIVE DESIGN EMPLOYS A SUPERCONDUCTING COIL IN THE MAGNETIC BEARING AND ELIMINATES ALL CONVENTIONAL MAGNETIC STRUCTURES IN ORDER TO PRODUCE A VIABLE HIGH-TORQUE MOMENTUMEXCHANGE EFFECTOR. THE MAGNETIC BEARING IS ALSO USED TO FULLY GIMBAL THE SUSPENDED ROTOR OF THE SLEW ACTUATOR. THE PROPOSED PHASE I RESEARCH WILL RESULT IN A DETAILED ANALYSISOF THE PERFORMANCE OF THIS ADVANCED CONTROL MOMENT GYRO. A LABORATORY DEMONSTRATION INCORPORATING CONVENTIONAL TECHNOLOGIES WILL ALSO BE DESIGNED DURING PHASE I. CONSTRUCTION AND TESTING OF THE HARDWARE WILL BE PERFORMED AS A PHASE II EFFORT.

* Information listed above is at the time of submission. *

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government