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Design procedure of segmented rotor switched reluctance motor for direct drive applications

Design procedure of segmented rotor switched reluctance motor for direct drive applications

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Switched reluctance motors (SRM) are becoming increasingly popular because of the rising cost of permanent magnets. It was reported that segmented rotor construction improves the torque output and efficiency. This study discusses an SRM with segmented rotor construction designed for direct drive application. Such a motor has an outer rotor. It is found that in such machines, the torque output increases when there are higher number of rotor segments than stator poles. A segmented rotor SRM with 12 stator poles and 26 rotor segments is discussed here. It has unique pole tip shape, which improves torque output. Design procedure of the motor is presented. Moreover, limitations of segmented rotor SRMs having a higher number of rotor segments than stator poles are also identified, and possible solutions are suggested. Experimental results on the prototype of a three-phase 12/26 motor are presented.


    1. 1)
    2. 2)
    3. 3)
    4. 4)
    5. 5)
    6. 6)
    7. 7)
      • 5. Horst, G.: ‘Isolated segmental switch reluctance motor’. US Patent 5111096, May1992.
    8. 8)
    9. 9)
    10. 10)
    11. 11)
    12. 12)
      • 16. Oyama, J., Higuchi, T., Takashi, A., Kifuji, N.: ‘Novel switched reluctance motor with segment core embedded in aluminium rotor block’, IEE Jpn. Trans. Ind. Appl., 2006, 126, (4), pp. 385390 (doi: 10.1541/ieejias.126.385).
    13. 13)
      • 2. Bilgin, B., Emadi, A., Krishnamurthy, M.: ‘Design considerations for switched reluctance machines with a higher number of rotor poles’, IEEE Trans. Ind. Electron., 2012, 59, (10), pp. 37453756 (doi: 10.1109/TIE.2011.2141102).
    14. 14)
      • 1. Desai, P.C., Krishnamurthy, M., Schofield, N., Emadi, A.: ‘Novel switched reluctance machine configuration with higher number of rotor poles than stator poles: concept to implementation’, IEEE Trans. Ind. Electron., 2010, 57, (2), pp. 649659 (doi: 10.1109/TIE.2009.2034678).
    15. 15)
      • 14. Rekik, M., Besbes, M., Marchand, C., Multon, B., Loudot, S., Lhotellier, D.: ‘Improvement in the field-weakening performance of switched reluctance machine with continuous mode’, IET Electr. Power Appl., 2007, 1, (5), pp. 785792 (doi: 10.1049/iet-epa:20070069).
    16. 16)
      • 4. Smaka, S., Masic, S., Hadzimejlic, N., Cosovic, M.: ‘Design considerations for novel 8/14 and comparison with conventional 8/6 and 8/10 switched reluctance machines’. Int. Symp. Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012, pp. 614619.
    17. 17)
      • 8. Mecrow, B.C., El-Kharashi, E.A., Finch, J.W., Jack, A.G.: ‘Segmental rotor switched reluctance motors with single-tooth windings’, IEE Proc. Electr. Power Appl., 2003, 150, (5), pp. 591599 (doi: 10.1049/ip-epa:20030366).
    18. 18)
      • 9. Nikam, S., Rallabandi, V., Fernandes, B.G.: ‘A high-torque-density permanent-magnet free motor for in-wheel electric vehicle application’, IEEE Trans. Ind. Appl., 2012, 48, (6), pp. 22872295 (doi: 10.1109/TIA.2012.2227053).
    19. 19)
      • 11. Bryne, J.V., Lacy, J.G.: ‘Characteristics of saturable stepper and reluctance motors’. IEE Conf. Small Electrical Machines, March 1976, pp. 9396.
    20. 20)
      • 15. Rahman, K.M., Fahimi, B., Suresh, G., Rajarathnam, A.V., Ehsani, M.: ‘Advantages of switched reluctance motor applications to EV and HEV: design and control issues’, IEEE Trans. Ind. Appl., 2000, 36, (1), pp. 111121 (doi: 10.1109/28.821805).
    21. 21)
      • 13. Lawler, J.S., Bailey, J.M., McKeever, J.W., Otaduy, P.J.: ‘Impact of continuous conduction on the constant power speed range of the switched reluctance motor’. IEEE Int. Conf. Electric Machines and Drives, 2005, pp. 12581292.
    22. 22)
      • 7. Widmer, J.D., Mecrow, B.C.: ‘Optimised segmental rotor switched reluctance machines with a greater number of rotor segments than stator slots’. IEEE Int. Electric Machines Drives Conf. (IEMDC), 2011, p. 17.
    23. 23)
      • 12. Miller, T.J.E.: ‘Converter volt-ampere requirements of the switched reluctance motor drive’, IEEE Trans. Ind. Appl., 1985, IA-21, (5), pp. 11361144 (doi: 10.1109/TIA.1985.349516).
    24. 24)
      • 10. Ehsani, M., Khwaja, M., Rahman, K.M., Toliyat, H.A.: ‘Propulsion system design of electric and hybrid vehicles’, IEEE Trans. Ind. Electron., 1997, 44, (1), pp. 1927 (doi: 10.1109/41.557495).
    25. 25)
      • 6. Mecrow, B.C., Finch, J.W., El-Kharashi, E.A., Jack, A.G.: ‘Preliminary performance evaluation of switched reluctance motors with segmental rotors’, IEEE Trans. Energy Convers., 2004, 19, (4), pp. 679686 (doi: 10.1109/TEC.2004.837290).
    26. 26)
      • 5. Horst, G.: ‘Isolated segmental switch reluctance motor’. US Patent 5111096, May1992.
    27. 27)
      • 3. Smaka, S., Masic, S., Cosovic, M., Salihbegovic, I.: ‘Switched reluctance machines for hybrid electric vehicles’. Int. Conf. Electrical Machines (ICEM), 2010, pp. 16.

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