Magnetic Behavior of Sintered NdFeB Magnets on a Long-Term Timescale
Joint Authors
Haavisto, Minna
Tuominen, Sampo
Santa-Nokki, Timo
Kankaanpää, Harri
Paju, Martti
Ruuskanen, Pekka
Source
Advances in Materials Science and Engineering
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-01-16
Country of Publication
Egypt
No. of Pages
7
Abstract EN
Stable polarization of permanent magnets over the lifetime of the application is an important aspect in electrical machine design.
Specification of the long-term stability of magnet material is difficult, since knowledge of the phenomenon is incomplete.
To be able to optimize magnet material selection, the long-term magnetic behavior of the material must also be understood.
This study shows that material with a very square JH curve is stable until a certain critical operating temperature is reached.
Major losses are detected as the critical temperature is exceeded.
Material with a rounder JH curve does not show a well-defined critical temperature, but increasing losses over a large temperature range.
The critical temperature of a material is also dependent on the field conditions.
Results differ whether the tests are performed in an open or closed magnetic circuit.
In open-circuit tests, the opposing field is not homogeneously distributed throughout the volume of the magnet and thus the long-term behavior is different than that in closed-circuit conditions.
Open-circuit tests seem to give bigger losses than closed-circuit tests in cases where the permeance coefficient of the open-circuit sample is considered to be the average permeance coefficient, calculated according to the dimensions of the magnet.
American Psychological Association (APA)
Haavisto, Minna& Tuominen, Sampo& Santa-Nokki, Timo& Kankaanpää, Harri& Paju, Martti& Ruuskanen, Pekka. 2014. Magnetic Behavior of Sintered NdFeB Magnets on a Long-Term Timescale. Advances in Materials Science and Engineering،Vol. 2014, no. 2014, pp.1-7.
https://search.emarefa.net/detail/BIM-1015856
Modern Language Association (MLA)
Haavisto, Minna…[et al.]. Magnetic Behavior of Sintered NdFeB Magnets on a Long-Term Timescale. Advances in Materials Science and Engineering No. 2014 (2014), pp.1-7.
https://search.emarefa.net/detail/BIM-1015856
American Medical Association (AMA)
Haavisto, Minna& Tuominen, Sampo& Santa-Nokki, Timo& Kankaanpää, Harri& Paju, Martti& Ruuskanen, Pekka. Magnetic Behavior of Sintered NdFeB Magnets on a Long-Term Timescale. Advances in Materials Science and Engineering. 2014. Vol. 2014, no. 2014, pp.1-7.
https://search.emarefa.net/detail/BIM-1015856
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1015856