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

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Permanent Magnet Overhang Effect on the Characteristics in Brushless DC Motor

브러시리스 직류전동기 특성에 대한 영구자석 오버행 효과

  • 전연도 (한양대 BK21기계분야) ;
  • 약미진치 (일본 조도전대학 이공학부 전기.정보생명공학과) ;
  • 이주 (한양대 전기공학과)
  • Published : 2004.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, the effect of permanent magnet overhang structure on the characteristics in Brushless DC motor has analyzed quantitatively. We classified the overhang structure as symmetric and asymmetric. 3D equivalent magnetic circuit network (EMCN) method which uses the permeance as the distributive variable is used for the efficient analysis of magnetic field. The overhang effect which increases the linkage flux at the stator is verified by comparison between overhang and no overhang structure. In addition, it is known that no load back electro motive force (EMF) is also increased due to the overhang effect. In case of asymmetric overhang structure, the ratio effect of the upper to lower overhang length on the magnetic forces is analyzed. Form the analysis results, the variation of the asymmetric overhang ratio has a significant effect on the axial magnetic force except the radial and tangential magnetic forces. The validity of the analysis results is also clarified by comparison between calculated results and measured ones such as back EMF and cogging torque.

Keywords

References

  1. J. P.Wang, D. K. Lieu, W. L. Lorimer and A. Hartman, 'Influence of the permanent magnet overhang on the performance of the brushless dc motor,' Journal of Applied Physics, vol. 83, no. 11, pp. 6362-6364, 1998 https://doi.org/10.1063/1.367809
  2. G. H. Jang and J. W. Yoon, 'Three dimensional analysis of magnetic force and torque in a BLDC motor due to the axial variation of yoke and pole,' IEEE Trans. on Magn., vol. 35, no.5, pp. 3694-3696, Sep., 1999 https://doi.org/10.1109/20.800634
  3. 河瀨 順洋, 山口 忠, 大野 友寬, '三次元有限要素法によろ薄形氷久磁石回轉機のコギングトルク解析,' 日本電氣學會 靜止器, 回轉機合同硏究會資料, SA-01-35, RM-01-103, pp. 85-90, 2001
  4. I. S. Jung, J. Hur and D.S.Hyun, 'Performance analysis of skewed PM linear synchronous motor according to various design parameters,' IEEE Trans. on Magn., vol.37, no.5, pp. 3653-3657, Sep., 2001 https://doi.org/10.1109/20.952683
  5. T. K. Lin, Y. H. Chang, H. C. Huang, S. J. Wang, T. F. Ying, and D. R. Huang, 'The dynamic performance affected by the axial magnetic force for a DVD spindle motor,' Journal of Magnetism and Magnetic Materials, vol. 209, pp. 183-185, Feb., 2000 https://doi.org/10.1016/S0304-8853(99)00682-4
  6. 임달호, 홍정표, '3차원 등가자기회로방법에 의한 영구자석 모터의 자계 해석,' 대한전기학회논문지, vol. 43, no, 9, pp. 1432-1439, 1994
  7. J. Hur, Y. D. Chun, J. Lee and D. S. Hyun, 'Dynamic analysis of radial force density in brushless DC motor using 3 dimensional equivalent magnetic circuit network method,' IEEE Trans. on Magn., vol. 34, no. 5, pp. 3142-3145, Sep., 1998 https://doi.org/10.1109/20.717736
  8. 전연도, 허진, 홍정표, 이주, 현동석, '3차원 등가자기회로망법을 이용한 브러시레스 DC 모터의 코깅토크 저감에 관한 연구', 대한전기학회 논문지, 제47권, 제 12호, pp. 2101-2107, 1998
  9. Y. H. Kim, C.S. Jin, S. Kim, Y. D. Chun and J. Lee, 'Analysis of hybrid stepping motor using 3D equivalent magnetic circuit network method based on trapezoidal element,' Journal of Applied Physics, vol. 91, no. 10, pp. 8311-8313, May, 2002 https://doi.org/10.1063/1.1456046
  10. J. Hur, D. S. Hyun, S. S. Kim, G. H. Kang and J. P. Hong, 'Three dimensional eddy current calculation using magnetic scalar potential in conducting regions,' Journal of Applied Physics, vol. 91, no. 10, pp. 8314-8316, May, 2002 https://doi.org/10.1063/1.1456047
  11. 양병렬, 권병일, 박승찬, '단상 BLDC 전동기의 토오크 리플 저감을 위한 공극 설계,' 대한전기학회논문지, 제51B권, 제2호, pp. 49-54, 2002
  12. Y. D. Chun, J. Lee and S. Wakao, 'Overhang effect analysis of brushless DC motor by 3D equivalent magnetic circuit network method,' IEEE Trans. on Magn., vol. 39, no. 5, pp. 1610-1613, May, 2003 https://doi.org/10.1109/TMAG.2003.810179
  13. Y. D. Chun, S. Wakao and J. Lee, 'Magnetic force characteristics according to the variation of asymmetric overhang ratio in brushless direct current motor,' Journal of Applied Physics, vol. 92, no. 10, pp. 8775-8777, 2003 https://doi.org/10.1063/1.1556985