Characteristic Analysis of Rotor Losses in High-Speed Permanent Magnet Synchronous Motor

초고속 영구자석형 동기 전동기의 회전자 손실 특성해석

  • 장석명 (충남대 공대 전기공학과) ;
  • 조한욱 (충남대 공대 전기공학과) ;
  • 이성호 (LG전자 DA연구소 요소기술그룹) ;
  • 양현섭 (삼성테크윈 파워시스템 연구소)
  • Published : 2004.03.01

Abstract

High-speed permanent magnet machines are likely to be a key technology for electric drives and motion control systems for many applications, since they are conductive to high efficiency, high power density, small size and low weight. In high-speed machines, the permanent magnets are often contained within a retaining sleeve. However, the sleeve and the magnets are exposed to high order flux harmonics, which cause parasitic eddy current losses. Rotor losses of high-speed machines are of great importance especially in high-speed applications, because losses heat the rotor, which is often very compact construction and thereby difficult to cool. This causes a danger of demagnetization of the NdFeB permanent magnets. Therefore, special attention should be paid to the prediction of the rotor losses. This paper is concerned with the rotor losses in permanent magnet high-speed machines that are caused by permeance variation due to stator slotting. First, the flux harmonics are determined by double Fourier analysis of the normal flux density data over the rotor surface. And then, the rectilinear model was used to calculate rotor losses in permanent magnet machines. Finally, Poynting vector have been used to investigate the rotor eddy current losses of high-speed Permanent magnet machine.

Keywords

References

  1. Isao Yakahashi et al, 'A super high speed PM motor drive system by a quisi-current source inverter,' IEEE Trans. Magn., vol. 30, pp.683-690, May/June, 1994
  2. Z.Q.Zhu, K.Ng, and D.Howe, 'Design and analysis of high-speed brushless permanent magnet motors,' Electrical Machines and Drives, pp.381-385, 1997
  3. Jason D.Ede, Z.Q.Zhu, and D.Howe,'Rotor resonances of high-speed permanent magnet brushless machines,' IEEE Trans. Magn., vol.38, Nov./Dec.. 2002 https://doi.org/10.1109/TIA.2002.804765
  4. K.Ng, Z.Q.Zhu and D.Howe, 'Open-circuit field distribution in a brushless motor with diametrically magnetized PM rotor, accounting for slotting and eddy current effects', IEEE Trans. Magn., vol. 32, pp.5070-5072, 1997 https://doi.org/10.1109/20.539493
  5. N. Boules, 'Impact of slot harmonics on losses of high-speed permanent magnet machines with a magnet retaining ring'. Electric Machines and Electromechanics, pp.527-539. 1981
  6. S.M.Abu Sharkh, M.R. Harris, N.Taghizadeh Irenji, 'Calculation of rotor eddy current loss in high-speed PM alternators'. Electrical Machines and Drives. pp.170-174. 1997
  7. S.M.Abu Sharkh, M.R. Harris, N.Taghizadeh Irenji, 'Effect of power factor on rotor loss in high-speed PM alternators'. Electrical Machines and Drives. pp.170-174. 1997
  8. 장석명, 정상섭, 류동완, '반경방향 착자형과 Halbach 배열형 영구자석 회전자를 갖는 고속 슬롯히스 기기의 공극자속 밀도 특성 비교,' 대한전기학회 논문지 제50B권, 제7호, pp.315-322
  9. N.Taghizadeh Irenji, Calculation of electromagnetic rotor losses in high-speed permanent magnet machines, PhD. dissertation. Univ. of Southampton, UK. 1998
  10. 이성호, 자기회로 구성조건에 따른 직선형 전자기 에너지 변환기의 정특성 해석, 박사학위논문, 충남대학교, 2003
  11. Z.Q.Zhu, D.Howe, 'Influence of design parameters on cogging torque in permanent magnet machine'. IEEE Trans. Energy Conv., vol.15, pp407-412. 2000 https://doi.org/10.1109/60.900501
  12. K. Atallah, D. Howe. P.H. Melloor and D.A. Stone, 'Rotor Loss in Permanent Magnet Brushless AC Machines' IEEE Trans. on Industry Application. vol.31, pp.60-62. 1999 https://doi.org/10.1109/28.887213