IEC TR 62518:2009

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Classification of magnetic flux loss due to temperature
  4.1 Reversible flux loss
  4.2 Irreversible flux loss
  4.3 Permanent flux loss
5 Long term ageing of rare earth magnets
6 Experimental
7 Temperature stability
  7.1 Flux change due to temperature
  7.2 Effect of temperature on B[r] and H[cJ]
      (demagnetization curves at different
      temperatures)
  7.3 The time effects at constant temperature
      (influence of temperature exposure
      and L/D)
  7.4 The influence of H[cJ] on the irreversible flux loss for
      Sm[2]Co[17] magnets
  7.5 The influence of H[cJ] on the irreversible flux loss for
      Nd-Fe-B magnets
  7.6 Irreversible flux loss per decade
  7.7 Permanent flux loss
8 Summary
Annex A (informative) Summary of temperature stability
        graphs
Annex B (informative) Non-linearity of temperature
        dependence of B[r] and H[cJ]
Bibliography

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 H_cJ 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.