The Transactions of the Korean Institute of Electrical Engineers B (대한전기학회논문지:전기기기및에너지변환시스템부문B)

The Korean Institute of Electrical Engineers (대한전기학회)
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Effect of Pole to Slot Ratio on Cogging Torque and EMF Waveform in Permanent Magnet Motor with Fractional-Slot

분수슬롯을 가진 영구자석 전동기에서 극당 슬롯 비율이 코깅토크와 역기전력에 미치는 영향

  • 이갑재 (한양대 공대 전기공학과) ;
  • 이주 (한양대 공대 전기공학과)
  • Published : 2003.09.01
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Abstract

Conventional integral-slot design in permanent magnet(PM) motor tends to have a high cogging torque and large end turns, which contribute to copper losses. The fractional-slot design is effective compared to integral-slot design in the cogging torque and electromotive force(EMF) waveform. The effectiveness of fractional slot can be maximized by selecting optimal pole to slot ratio. This paper presents the effect of pole to slot ratio on the cogging torque and EMF waveform in the PM motor with fractional-slot. The effectiveness of the proposed designs has been confirmed by comparing waveform of EMF. cogging torque and torque ripple between conventional and new models.

Keywords

References

  1. J. R. Henderson Jr. and T. J. E Miller, Design of brushless permanent magnet motors, Oxford, 1994
  2. T.M. Jahns and W. L. Soong, 'Pulsating torque minimization techniques for permanent magnet ac motor drives-A review', IEEE Trans. on Power Electronics, vol. 43, no. 2, pp. 321-330, 1996 https://doi.org/10.1109/41.491356
  3. R. P. Deodhar, D. A. Station, T. M. Jahns, and T. J. E. Miller, 'Prediction of cogging torque using the flux-mmf diagram technique', IEEE trans. on Industry Application, vol. 32, pp.569-576, 1996 https://doi.org/10.1109/28.502168
  4. Z. Q. Zhu and David Howe, 'Influence of design parameters on cogging torque in permanent magnet machines', IEEE Trans. on Energy Conversion, vol. 15, no.4, pp. 407-412, December 2000 https://doi.org/10.1109/60.900501
  5. Sunil Murthy, Benoit Derouane, Buyun Liu and Tommy Sebastian, 'Minimization of torque pulsation in trapezoidal back-emf permanent magnet brushless DC motor', IEEE IAS Annual Meeting, Vol. 2 , pp.1237-1242, 1999 https://doi.org/10.1109/IAS.1999.801661
  6. J. Cros, P. Viarouge, 'Synthesis of high performance PM motors with concentrated windings', IEEE Trans. On Energy Conversion, vol. 17, No.2, pp.248-253, June 1999 https://doi.org/10.1109/TEC.2002.1009476