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IEC TR 62518:2009

(Main)

Rare earth sintered magnets - Stability of the magnetic properties at elevated temperatures

Rare earth sintered magnets - Stability of the magnetic properties at elevated temperatures

IEC/TR 62518:2009(E) describes the temperature behaviour of rare earth sintered magnets in detail for use in designing magnetic circuits exposed to elevated temperatures. The temperature behaviour of SmCo5, Sm2Co17 and Nd-Fe-B sintered magnets is described. The various changes of open circuit flux which can occur due to temperature are discussed in Clause 4. The long term stability of the magnets is discussed in Clause 5. The experimental procedures are described in Clause 6. Results of the measurements of the flux loss occurring at the ambient temperature after heating isothermally at 50 °C, 75 °C, 100 °C, 125 °C, 150 °C and 200 °C for up to 1000 h are given in Clause 7. The effect of length to diameter ratio (L/D) of the magnet samples and the influence of HcJ on the flux loss were also studied. The results are discussed in Clause 8. The data in this technical report was provided by the Institute of Electrical Engineers of Japan (IEEJ) and its subcommittees. This data has been gathered from the members of these sub-committees. The temperature stability correlated with the complex corrosion behaviour and the spin re-orientation phenomena at cryogenic temperatures will not be given in this technical report.

General Information

Status
Published
Publication Date
16-Mar-2009
ICS
01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
29.030 - Magnetic materials
Technical Committee
TC 68 - Magnetic alloys and steels
Drafting Committee
WG 5 - TC 68/WG 5
Current Stage
PPUB - Publication issued
Start Date
15-Jun-2009
Completion Date
17-Mar-2009
Ref Project

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IEC TR 62518:2009 - Rare earth sintered magnets - Stability of the magnetic properties at elevated temperaturesIEC TR 62518:2009 - Rare earth sintered magnets - Stability of the magnetic properties at elevated temperatures
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IEC TR 62518:2009 - Rare earth sintered magnets - Stability of the magnetic properties at elevated temperatures
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IEC/TR 62518
®
Edition 1.0 2009-03
TECHNICAL
REPORT

Rare earth sintered magnets – Stability of the magnetic properties at elevated
temperatures


IEC/TR 62518:2009(E)

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC/TR 62518
®
Edition 1.0 2009-03
TECHNICAL
REPORT

Rare earth sintered magnets – Stability of the magnetic properties at elevated
temperatures


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 29.030 ISBN 978-2-88910-753-7
® Registered trademark of the International Electrotechnical Commission

---------------------- Page: 3 ----------------------
– 2 – TR 62518 © IEC:2009(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .7
4 Classification of magnetic flux loss due to temperature.9
4.1 Reversible flux loss .9
4.2 Irreversible flux loss .9
4.3 Permanent flux loss.9
5 Long term ageing of rare earth magnets .10
6 Experimental .11
7 Temperature stability.13
7.1 Flux change due to temperature .13
7.2 Effect of temperature on B and H (demagnetization curves at differ
...

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