A Passive Magnetic Bearing Flywheel

TITLE AND SUBTITLE:
A Passive Magnetic Bearing Flywheel

AUTHOR(S):
Mark Siebert, Ben Ebihara, Ralph Jansen, Robert L. Fusaro, Wilfredo Morales, Albert Kascak, and Andrew Kenny

REPORT DATE:
February 2002

FUNDING NUMBERS:
WU-274-00-00-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-13017

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2002-211159
IECEC2001-AT-89

SUPPLEMENTARY NOTES:
Prepared for the 36th Intersociety Energy Conversion Engineering Conference cosponsored by the ASME, IEEE, AIChE, ANS, SAE, and AIAA, Savannah, Georgia, July 29-August 2, 2001. Mark Siebert, Ben Ebihara, and Ralph Jansen, Ohio Aerospace Institute, 22800 Cedar Point Road, Brook Park, Ohio 44142; Robert L. Fusaro and Wilfredo Morales, NASA Glenn Research Center; Albert Kascak, U.S. Army Research Laboratory, NASA Glenn Research Center; Andrew Kenny, Texas A&M University, College Station, Texas 77843. Responsible person, Robert L. Fusaro, organization code 5950, 216-433-6080.

ABSTRACT:
A 100 percent passive magnetic bearing flywheel rig employing no active control components was designed, constructed, and tested. The suspension of the 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.

SUBJECT TERMS:
Space; Mechanisms; Bearings; Flywheel; Energy storage

NUMBER OF PAGES:
16

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2002/TM-2002-211159.pdf
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