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A Passive Magnetic Bearing FlywheelA 100 percent passive magnetic bearing flywheel rig employing no active control components was designed, constructed, and tested. The suspension clothe rotor was provided by two sets of radial permanent magnetic bearings operating in the repulsive mode. The axial support was provided by jewel bearings on both ends of the rotor. The rig was successfully operated to speeds of 5500 rpm, which is 65 percent above the first critical speed of 3336 rpm. Operation was not continued beyond this point because of the excessive noise generated by the air impeller and because of inadequate containment in case of failure. Radial and axial stiffnesses of the permanent magnetic bearings were experimentally measured and then compared to finite element results. The natural damping of the rotor was measured and a damping coefficient was calculated.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Siebert, Mark
(Ohio Aerospace Inst. Brook Park, OH United States)
Ebihara, Ben
(Ohio Aerospace Inst. Brook Park, OH United States)
Jansen, Ralph
(Ohio Aerospace Inst. Brook Park, OH United States)
Fusaro, Robert L.
(NASA Glenn Research Center Cleveland, OH United States)
Morales, Wilfredo
(NASA Glenn Research Center Cleveland, OH United States)
Kascak, Albert
(Army Research Lab. Cleveland, OH United States)
Kenny, Andrew
(Texas A&M Univ. College Station, TX United States)
Date Acquired
September 7, 2013
Publication Date
February 1, 2002
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NAS 1.15:211159
Meeting Information
Meeting: 36th Intersociety Energy Conversion Engineering Conference
Location: Savannah, GA
Country: United States
Start Date: July 29, 2001
End Date: August 2, 2001
Sponsors: American Society of Mechanical Engineers, American Inst. of Chemical Engineers, American Nuclear Society, American Inst. of Aeronautics and Astronautics, Institute of Electrical and Electronics Engineers, Society of Automotive Engineers, Inc.
Funding Number(s)
PROJECT: RTOP 274-00-00
Distribution Limits
Work of the US Gov. Public Use Permitted.
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