GLTRS--Glenn
TITLE AND SUBTITLE:
Magnetic and Electrical Characteristics of Cobalt-Based Amorphous Materials and Comparison to a Permalloy Type Polycrystalline Material

AUTHOR(S):
William R. Wieserman, Gene E. Schwarze, and Janis M. Niedra

REPORT DATE:
December 2005

FUNDING NUMBERS:
WBS-22-612-50-81-12

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-15321

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-2005-213997
AIAA-2005-5720

SUPPLEMENTARY NOTES:
Prepared for the Third International Energy Conversion Engineering Conference sponsored by the American Institute of Aeronautics and Astronautics, San Francisco, California, August 15-18, 2005. William R. Wieserman, University of Pittsburgh, Johnstown, 450 Schoolhouse Road, Johnstown, Pennsylvania 15904; Gene E. Schwarze, NASA Glenn Research Center; and Janis M. Niedra, QSS Group, Inc., 21000 Brookpark Road, Cleveland, Ohio 44135. Responsible person, Gene E. Schwarze, organization code RPE, 216-433-6117.

ABSTRACT:
Magnetic component designers are always looking for improved soft magnetic core materials to increase the efficiency, temperature rating and power density of transformers, motors, generators and alternators, and energy density of inductors. In this paper, we report on the experimental investigation of commercially available cobalt-based amorphous alloys which, in their processing, were subjected to two different types of magnetic field anneals: A longitudinal magnetic field anneal or a transverse magnetic field anneal. The longitudinal field annealed material investigated was Metglas® 2714A. The electrical and magnetic characteristics of this material were investigated over the frequency range of 1 to 200 kHz and temperature range of 23 to 150 °C for both sine and square wave voltage excitation. The specific core loss was lower for the square than the sine wave voltage excitation for the same maximum flux density, frequency and temperature. The transverse magnetic field annealed core materials include Metglas® 2714AF and Vacuumschmelze 6025F. These two materials were experimentally characterized over the frequency range of 10 to 200 kHz for sine wave voltage excitation and 23 °C only. A comparison of the 2174A to 2714AF found that 2714AF always had lower specific core loss than 2714A for any given magnetic flux density and frequency and the ratio of specific core loss of 2714A to 2714AF was dependent on both magnetic flux density and frequency. A comparison was also made of the 2714A, 2714AF, and 6025F materials to two different tape thicknesses of the polycrystalline Supermalloy material and the results show that 2714AF and 6025F have the lowest specific core loss at 100 kHz over the magnetic flux density range of 0.1 to 0.4 Tesla.

SUBJECT TERMS:
Specific core loss; B-H hysteresis loop; Magnetic field anneal; Sine wave voltage excitation; Square wave; Voltage excitation; Permalloy; High frequency; Magnetic measurements; Magnetic cores

NUMBER OF PAGES:
23

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2005/TM-2005-213997.pdf ( 418 KB )
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