International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

MODELING OF IRON LOSSES IN PERMANENT MAGNET SYNCHRONOUS MOTORS WITH FIELD-WEAKENING CAPABILITY FOR ELECTRIC VEHICLES

  • Chin, Y.K. (Royal Institute of Technology (KTH), Competence Center in Electric Power Engineering) ;
  • Soulard, J. (Royal Institute of Technology (KTH), Competence Center in Electric Power Engineering)
  • Published : 2003.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Recent advancements of permanent magnet (PM) materials and solid-state devices have contributed to a substantial performance improvement of permanent magnet machines. Owing to the rare-earth PMs, these motors have higher efficiency, power factor, output power per mass and volume, and better dynamic performance than induction motors without sacrificing reliability. Not surprisingly, they are continuously receiving serious considerations for a variety of automotive and propulsion applications. An electric vehicle (EV) requires a high-effficient propulsion system having a wide operating range and a capability of generating a high peak torque for short durations. The improvement of torque-speed performance for these systems is consequently very important, and researches in various aspects are therefore being actively pursued. A great emphasis has been placed on the efficiency and optimal utilization of PM machines. This requires attention to many aspects related to the machine design and overall performance. In this respect, the prediction of iron losses is particularly indispensable and challenging, especially for drives with a deep field-weakening range. The objective of this paper is to present iron loss estimations of a PM motor over a wide speed range. As aforementioned, in EV applications core losses can be significant during high-speed operation and it is imperative to evaluate these losses accurately and take them into consideration during the motor design stage. In this investigation, the losses are predicted by using an analytical model and a 2D time-stepped finite element method (FEM). The results from different analytical approaches are compared with the FEM computations. The validity of each model is then evaluated by these comparisons.

Keywords

References

  1. Berotti, G. et al. (1991). An Improved estimation of ironlosses in rotation electrical machines. IEEE Trans. onMagnetics 27, 6, 5007-5009 https://doi.org/10.1109/20.278722
  2. Deng, F. (1999). An Improved Iron Loss Estimation ofPermanent Magnet Brushless Machines. IEEE Trans on Energy Conversion 14, 4, 1391-1395 https://doi.org/10.1109/60.815078
  3. Gieras, J. F. and Wing, M. (2002). Permanent Magnet Motor Technology. 2nd edn. Marcel Dekker. NewYork
  4. Jamil, M. K. and Demerdash, N. A. (1990). Harmonics and core losses of permanent magnet DC motors controlled by chopper circuits. IEEE Trans. on Energy Conversion 5, 2, 408-414 https://doi.org/10.1109/60.107240
  5. Levers, J. D., Biringer, P. P. and Hollitscher, H. (1978).A simple method of estimating the minor loop hysteresis loss in thin laminations. IEEE Trans. onMagnetics 14, 5, 386-388 https://doi.org/10.1109/TMAG.1978.1059858
  6. Mi, C., Slemon, G. R. and Togawa, N. (1984). Modelling of iron losses of surface mounted permanent magnet synchronous motors. IEEE IAS Annual Meeting 4,2585-2591
  7. Sagawa, M. (1984). New material for permanent magnetson a base of Nd and Fe. Jour. Appl. Phys 55, 6, 2083-2087 https://doi.org/10.1063/1.333572
  8. Sebastian, T. and Slemon, G. R. (1987). Operating limitsof inverter driven permanent magnet motor drives. IEEE lAS Annual Meeting 23, 2, 327-333
  9. Slemon, G. R. and Liu, X. (1990). Core losses inpermanent magnet motors. IEEE Trans. on Magnetics26,5,1653-1655 https://doi.org/10.1109/20.104480