1、 IEC/TR 62518Edition 1.0 2009-03TECHNICAL REPORT Rare earth sintered magnets Stability of the magnetic properties at elevated temperatures IEC/TR 62518:2009(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGH
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10、11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC/TR 62518Edition 1.0 2009-03TECHNICAL REPORT Rare earth sintered magnets Stability of the magnetic properties at elevated temperatures INTERNATIONAL ELECTROTECH
11、NICAL COMMISSION UICS 29.030 PRICE CODEISBN 2-8318-1034-1 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TR 62518 IEC:2009(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1
12、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 c
13、hange due to temperature.13 7.2 Effect of temperature on Br and HcJ (demagnetization curves at different temperatures).14 7.3 The time effects at constant temperature(influence of temperature exposure and L/D).16 7.4 The influence of HcJ on the irreversible flux loss for Sm2Co17 magnets.18 7.5 The i
14、nfluence of HcJ on the irreversible flux loss for Nd-Fe-B magnets.20 7.6 Irreversible flux loss per decade.22 7.7 Permanent flux loss.22 8 Summary.24 Annex A(informative)Summary of temperature stability graphs.25 Annex B(informative)Non-linearity of temperature dependence of Br and HcJ.26 Bibliograp
15、hy.27 Figure 1 Change of magnetic flux density operating on a load line during elevated temperature ageing after R.Tenzer(schematic)7,8.10 Figure 2 Long term ageing of rare earth magnets(schematic)9.11 Figure 3 Measuring system of open circuit flux utilizing a fluxgate type digital integrating fluxm
16、eter 13.12 Figure 4 Temperature dependence of flux for SmCo5 magnet(L/D=0,7)16(See Table 1).14 Figure 5 Temperature dependence of flux for Sm2Co17 magnet(L/D=0,7)16(See Table 1).14 Figure 6 Temperature dependence of flux for Nd-Fe-B magnet(L/D=0,7)17(See Table 1).14 Figure 7 J-H demagnetization curves of Nd-Fe-B magnet measured at different temperatures 18.14 Figure 8 J-H demagnetization curves of Nd-Fe-B magnet measured at different temperatures 19.15 Figure 9 Temperature dependence of normaliz
