Analytical design of the integrated motor used in a hubless rim-driven propulsor

Analytical design of the integrated motor used in a hubless rim-driven propulsor

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Electric Power Applications — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

The rim-driven integrated motor propulsor (IMP) has received much attention in recent years, owing to its superiority in flexibility, reliability, and space occupation. For this propulsion system, radially thin motors with high torque and large air gaps are essential. Two-segment Halbach array permanent magnets with unequal segment-arc are adopted to enable a thin rotor and a large air gap. The general analytical solution of the magnetic field is presented. Based on the analytical calculation of the Halbach motor performance, the necessity of the rotor core was discussed, and the Halbach array was optimised with an analytical method to maximise the electromagnetic torque. This study also tried and compared three designs of the integrated motor stator to further reduce the radial thickness, and the slotted stator proved more reasonable. The fabrication of an IMP prototype was completed, and the experimental data of the integrated motor are presented and compared with the calculated results. This study also conducted the water tunnel experiment of the IMP prototype to test the integrated motor performance in the overall IMP system. The measured rotational speed and output thrust are less than expected, so the friction loss in the IMP gap flow field is calculated and analysed.


    1. 1)
      • 1. Pan, G., Lu, L.: ‘Numerical simulation of steady hydrodynamic performance for integrated motor propulsor on CFD’. Proc. Int. Conf. Virtual Real. Vis., Xi'an, China, 2013, pp. 1520.
    2. 2)
      • 2. Brown, D.W., Repp, J.R., Taylor, O.S.: ‘Submersible outboard electric motor/propulsor’, Nav. Eng. J., 1989, 101, (5), pp. 4452.
    3. 3)
      • 3. Lea, M., Thompson, D., Van Blarcom, B., et al: ‘Scale model testing of a commercial rim driven propulsor pod’, J. Ship Prod., 2004, 19, (2), pp. 121130.
    4. 4)
      • 4. Kim, K., Turnock, S.R., Ando, J., et al: ‘The propulsion committee: final report and recommendations to the 25th ITTC’. Proc. Int. Towing Tank Conf., Fukuoka, Japan, 2008, pp. 115121.
    5. 5)
      • 5. Yakovlev, A.Y., Sokolov, M.A., Marinich, N.V.: ‘Numerical design and experimental verification of a rim-driven thruster’. Proc. 2nd Int. Symp. Marine Propulsors, Hamburg, Germany, 2011.
    6. 6)
      • 6. Cao, Q.M., Hong, F.W., Tang, D.H., et al: ‘Prediction of loading distribution and hydrodynamic measurements for propeller blades in a rim driven thruster’, J. Hydrodyn., 2012, 24, (1), pp. 5057.
    7. 7)
      • 7. Hsieh, M.F., Chen, J.H., Yeh, Y.H., et al: ‘Integrated design and realization of a hubless rim-driven thruster’. Proc. IEEE 33rd Annu. Conf. IECON, Taipei, November 2007, pp. 30333038.
    8. 8)
      • 8. Sharkh, S.M., Lai, S.H.: ‘Slotless PM brushless motor with helical edge-wound laminations’, IEEE Trans. Energy Conv., 2009, 24, (3), pp. 594598.
    9. 9)
      • 9. Lai, S.H., Sharkh, S.M.: ‘Structurally integrated slotless PM brushless motor with spiral wound laminations for marine thrusters’. Proc. 3rd Int. Conf. Power Electron. Mach. Drives, Dublin, 2006, pp. 106110.
    10. 10)
      • 10. Liang, J.H., Zhang, X.F., Qiao, M.Z., et al: ‘Optimal design and multifield coupling analysis of propelling motor used in a novel integrated motor propeller’, IEEE Trans. Magn., 2013, 49, (12), pp. 57425748.
    11. 11)
      • 11. Krøvel, Ø., Nilssen, R., Skaar, S.E., et al: ‘Design of an integrated 100 kW permanent magnet synchronous machine in a prototype thruster for ship propulsion’. Proc. Int. Conf. Elect. Mach., Cracow, Poland, 2004, pp. 117123.
    12. 12)
      • 12. Krøvel, Ø.: ‘Design of large permanent magnetized synchronous electricmachines’. PhD thesis, Dept. Elect. Pow. Eng., Norwegian Univ. Sci. Tech., 2011.
    13. 13)
      • 13. Sharkh, S.M., Lai, S.H., Turnock, S.R.: ‘A structurally integrated brushless PM motor for miniature propeller thrusters’, IEE Proc. Electr. Power Appl., 2004, 151, (5), pp. 513519.
    14. 14)
      • 14. Shen, Y., Hu, P., Jin, S., et al: ‘Design of novel shaftless pump-Jet propulsor for multi-purpose long-range and high-speed autonomous underwater vehicle’, IEEE Trans. Magn., 2016, 52, (7), pp. 14.
    15. 15)
      • 15. Li, J., Chau, K.T.: ‘A novel HTS PM vernier motor for direct-drive propulsion’, IEEE Trans. Appl. Supercond., 2011, 21, (3), pp. 11751179.
    16. 16)
      • 16. Hassannia, A., Darabi, A.: ‘Design and performance analysis of superconducting rim-driven synchronous motors for marine propulsion’, IEEE Trans. Appl. Supercond., 2014, 24, (1), pp. 4046.
    17. 17)
      • 17. Tuohy, P.M., Smith, A.C., Husband, M.: ‘Induction rim-drive for a marine propulsor’. Proc. IET Int. Conf. Power Electron., Machines and Drives, Brighton, U.K., 2010, pp. 16.
    18. 18)
      • 18. Tuohy, P.M., Smith, A.C., Husband, M., et al: ‘Rim-drive marine thruster using a multiple-can induction motor’, IET Electr. Power Appl., 2013, 7, (7), pp. 557565.
    19. 19)
      • 19. Richardson, K.M., Pollock, C., Flower, J.O.: ‘Design of a switched reluctance motor for an integrated motor/propeller unit’. Proc. IEE 7th Int. Conf. Elect. Mach. Drives, Durham, NC, September 1995, pp. 271275.
    20. 20)
      • 20. Xia, Z.P., Zhu, Z.Q., Howe, D.: ‘Analytical magnetic field analysis of halbach magnetized permanent-magnet machines’, IEEE Trans. Magn., 2004, 40, (4), pp. 18641872.
    21. 21)
      • 21. Shen, Y., Zhu, Z.Q.: ‘General analytical model for calculating electromagnetic performance of permanent magnet brushless machines having segmented Halbach array’, IET Electr. Syst. Transp., 2013, 3, (3), pp. 5766.
    22. 22)
      • 22. Hanselman, D.C.: ‘Brushless permanent magnet motor design’ (Magna Physics Publishing, Lebanon, Ohio, 2006, 2nd edn.).

Related content

This is a required field
Please enter a valid email address