NDLI: An Experiment on Demagnetization of a Trapped Magnetic Field in HTS Bulk Exposed to an Alternating and Rotating Magnetic Field

Content Provider	IEEE Xplore Digital Library
Author	Ninomiya, A. Kawaguchi, H. Ishigohka, T.
Copyright Year	2002
Abstract	We have examined the decay characteristics of magnetized flux in a YBCO-QMG HTS bulk material in a weak changing external magnetic field with a magnitude around the penetration field. Two kinds of external magnetic field are applied to the HTS bulk. One is a rotating magnetic field with a rotating speed of 3,000 rpm, 60,000 rpm and the other is an alternating magnetic field with a frequency of 50 Hz. In order to carry out the experiment, we have utilized a stator of a conventional 3 phase induction motor with 2 poles. The external magnetic field is applied in two directions, one is parallel and the other is perpendicular to the direction of the magnetization which corresponds to the C-axis of the HTS bulk. The characteristic of the magnetized flux decay has been measured for one hour. The experimental results show that the external magnetic field higher than 30 mT allows the trapped magnetic flux density to move more easily. And, the decay of the magnetized flux by a perpendicular magnetic field to the C-axis is larger than that by a parallel magnetic field to the C-axis.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3557
Ending Page	3560
Page Count	4
File Size	652916
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic fields Demagnetization High temperature superconductors Magnetic flux Magnetic field measurement Magnetic materials Frequency Stators Induction motors Magnetization rotating and alternating magnetic field Decay of trapped magnetic flux density flux creep HTS bulk
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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