NDLI: Temperature Stability and Flux Losses Over Time in Sintered Nd–Fe

Content Provider	IEEE Xplore Digital Library
Author	Haavisto, M. Paju, M.
Copyright Year	1965
Abstract	Demagnetization occurring with time in a constant temperature is often assumed to be negligible, provided that the operating point of the magnet is above the knee of the B-H curve. However, because it is important to ensure that no permanent flux losses occur in permanent magnets during their use in industrial applications, there is a clear need to quantify these time-dependent losses. We measured losses over time for four commercial sintered Nd-Fe-B magnet grades at five different temperatures (23degC-150degC). We tested samples with three different permeance coefficient (Pc) values for each material. The time-dependent losses measured fitted the logarithmic law of magnetic viscosity well. We demonstrated that the total flux loss in a lifetime of 30 years can be estimated according to the temperature, coercivity of the material, and the permeance coefficient of the magnet. With proper selection of the magnet material, in accordance with the designed Pc of the application, the total flux loss in 30 years can be minimized almost to zero even at 150degC.
Sponsorship	IEEE Magnetics Society
Starting Page	5277
Ending Page	5280
Page Count	4
File Size	237170
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Stability Permanent magnets Magnetic flux Magnetic materials Loss measurement Demagnetization Knee Time measurement Materials testing stability Losses neodymium compounds permanent magnets
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Time Dependence of Demagnetization and Flux Losses Occurring in Sintered Nd-Fe-B Permanent Magnets

Estimation of Time-Dependent Polarization Losses in Sintered Nd-Fe-B Permanent Magnets

Time Dependence of Demagnetization and Flux Losses Occurring in Sintered Nd-Fe-B Permanent Magnets

Elevated temperature behavior of sintered Nd-Fe-B type magnets

Angular dependence of the demagnetization stability of sintered Nd-Fe-B magnets

Corrosion Losses in Sintered (Nd, Dy)–Fe–B Magnets for Different Geometries

Angular dependence of the demagnetization stability of sintered Nd-Fe-B magnets

Demagnetization process and magnetic seeds for R-Fe-B permanent magnets

Magnetic aftereffect of Nd-Fe-B sintered magnets

Temperature Stability and Flux Losses Over Time in Sintered Nd–Fe–B Permanent Magnets

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