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Journal of power electronics : JPE v.6 no.4, 2006년, pp.290 - 297  

Detent Force Reduction of a Tubular Linear Generator Using an Axial Stepped Permanent Magnet Structure

Eid Ahmad M.    (Dept. of Electrical Eng., Kyungnam University   ); Lee Hyun-Woo    (Dept. of Electrical Eng., Kyungnam University   ); Nakaoka Mutsuo    (Dept. of Electrical Eng., Kyungnam University  );
  • 초록

    Various methods have been discussed to reduce detent force in a tubular permanent magnet type linear single phase AC generator. In particular, the proposed methods depend on variations of the permanent magnet construction. These methods include two approaches in the form of sloped magnets, and conical magnets in addition to the conventional method of optimizing the magnet length. The undesired detent force ripples were calculated by a two dimensional Finite Element Method (FEM). Moreover, the generated electromotive force in the stator coils was calculated for each configuration of the permanent magnet. The experimental results agreed well with those obtained from the FEM-based simulations. Sufficient reduction in the detent force was achieved over the range of 40% while the root mean square of the output voltage was maintained. It was found that sloping the permanent magnet decreased the detent force and at the same time increased the generated rms voltage of the AC generator. The performance of the designed linear AC generator was evaluated in terms of its efficiency, total weight, losses, and power to weight ratio.


  • 주제어

    permanent magnet .   detent force .   induced voltage .   linear generator .   and finite element method.  

  • 참고문헌 (11)

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    4. Ahmad Eid, Kang-Ju Sung, Choi Seok Won, Han Ho Dong, H.W. Lee and M. Nakaoka, 'Cogging force minimization using stepped permanent magnets in linear generators', 2005 Korea Wind Energy Association (KWEA) General Meeting and International Symposium, pp. 188-196, December 9-10, 2005, Jun Ju, Korea 
    5. W. M. Arshad, 'A low-leakage linear transverse-flux machine for a free-piston generator', Ph. D. thesis, Royal Institute of technology, Stockholm, Sweden, 2003 
    6. H. Arof, Ahmad M. Eid and K. M. Nor, 'Cogging force reduction using special magnet design for tubular permanent magnet linear generators', 39th International Universities Power Engineering Conference (UPEC'2004), pp. 523 527, Vol. (2), 6-8 September 2004, Bristol, UK 
    7. A. Benhama, A. C. Williamson, and A. B. J. Reece, 'Force and torque computation from 2-D and 3-D finite element field solutions', IEE Proc.-Electr. Power Appl., Vol. 146, No. 1, pp. 25-31, 1999 
    8. Ahmad M. Eid, Sung-Jun Kim, Hyun-Woo Lee and Mutsuo Nakaoka, 'Tubular Permanent Magnet Linear Synchronous Generator Design For Linear Engine Applications', The Korean Institute of Electrical Engineers, Electrical Machinery and Energy Conversion System Society (KIEE-EMECS) Autumn Annual Conference 2005, pp. 17-19, October 20-22, 2005, Gwangju, Korea 
    9. W. R. Cawthorne, 'Optimization of a brushless permanent magnet linear alternator for use with a linear internal combustion engine', Ph. D. West Virginia University, USA, 1999 
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    11. K.-C. Lim, J.-K. Woo, G.-H. Kang, J.-P. Hong and G.-T. Kim, 'Detent force minimization techniques in permanent magnet linear synchronous motors', IEEE Trans. Magn., Vol. 38, No. 2, pp. 1157-1160, 2002 

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  • Lee, Hyun-Woo (41)

    1. 1991 "PAM형 PWM 인버터의 출력특성에 관한 연구" 照明·電氣設備學會誌 = Journal of the Korean institute of illuminating and electrical installation engineers 5 (4): 69~74    
    2. 1992 "PAM-PWM 인버터에 의한 정현파출현" 한국통신학회논문지 = The journal of the Korean institute of communication science 17 (5): 521~528    
    3. 1993 "전압 적분 제어법에 의한 DC-DC 컨버터" 한국통신학회논문지 = The journal of the Korean institute of communication science 18 (10): 1590~1597    
    4. 1994 "3상 위상제어 컨버터의 저고조파 제거를 위한 제어기" 電子工學會論文誌. Journal of the Korea institute of telematics and electronics. B b31 (9): 178~185    
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