access icon free Designing and experimentally testing a flux-focusing axial flux magnetic gear for an ocean generator application

© The Institution of Engineering and Technology
Received 07/12/2018, Accepted 10/04/2019, Revised 19/03/2019, Published 16/04/2019

The torque density characteristics for an axial flux magnetic gear using a flux-focusing topology is experimentally studied when using neodymium iron boron (NdFeB) rare-earth magnets. A geometric parameter sweep analysis was utilised in order to maximise both the calculated volumetric and mass torque density. The calculated torque and torque density was 628.6 N·m and 173.02 N·m/L while the experimentally measured torque and resultant torque density was 553.2 N·m and 152.3 N·m/L.

Inspec keywords: neodymium alloys; boron alloys; automotive components; torque; magnetic flux; gears; automotive electrics; iron alloys; permanent magnets

Other keywords: calculated torque; flux-focusing axial magnetic gear; resultant torque density; geometric parameter sweep analysis; torque density characteristics; (NdFeB) rare-earth magnets; calculated volumetric mass torque density; experimentally measured torque; ocean generator application; flux-focusing topology

Subjects: Mechanical drives and transmissions; Permanent magnets; d.c. machines; Transportation; a.c. machines; Mechanical components

References

    1. 1)
      • 16. Gardner, M.C., Johnson, M., Toliyat, H.A.: ‘Comparison of surface permanent magnet axial and radial flux coaxial magnetic gears’, IEEE Trans. Energy Convers., 2018, 33, (4), pp. 2250–2259.
    2. 2)
      • 5. Uppalapati, K.K., Calvin, M.D., Wright, J.D., et al: ‘A magnetic gearbox with an active region torque density of 239 N·m/L’, IEEE Trans. Ind. Appl., 2018, 54, (2), pp. 1331–1338.
    3. 3)
      • 30. Kouhshahi, M.B., Bird, J.Z., Acharya, V., et al: ‘An axial flux-focusing magnetically geared motor’. 2017 IEEE Energy Conversion Congress and Exposition (ECCE), Cincinnati, OH, USA, 2017, pp. 307–313.
    4. 4)
      • 6. Hao, W., Zhou, J.: ‘The cycloid magnetic gear based on Halbach array’, J. Mech. Strength, 2017, 39, pp. 226–229.
    5. 5)
      • 10. Atallah, K., Howe, D.: ‘A novel high-performance magnetic gear’, IEEE Trans. Magn., 2001, 37, (4), pp. 2844–2846.
    6. 6)
      • 9. Li, K., Bird, J., Kadel, J., et al: ‘A flux-focusing cycloidal magnetic gearbox’, IEEE Trans. Magn., 2015, 51, (11), pp. 1–4.
    7. 7)
      • 12. Li, K., Bird, J.Z.: ‘A review of the volumetric torque density of rotary magnetic gear designs’. 2018 XIII Int. Conf. on Electrical Machines (ICEM), 2018, pp. 2016–2022.
    8. 8)
      • 20. Acharya, V.M.: ‘Design of a flux focusing axial magnetic gear’ (University of North Carolina, Charlotte, 2013).
    9. 9)
      • 2. Polinder, H., Ferreira, J.A., Jensen, B.B., et al: ‘Trends in wind turbine generator systems’, IEEE J. Emerg. Sel. Top. Power Electron., 2013, 1, (3), pp. 174–185.
    10. 10)
      • 11. Rasmussen, P.O., Andersen, T.O., Jorgensen, F.T., et al: ‘Development of a high-performance magnetic gear’, IEEE Trans. Ind. Appl., 2005, 41, (3), pp. 764–770.
    11. 11)
      • 26. Johnson, M., Gardner, M.C., Toliyat, H.A.: ‘Design and analysis of an axial flux magnetically geared generator’, IEEE Trans. Ind. Appl., 2017, 53, (1), pp. 97–105.
    12. 12)
      • 28. Fu, W.N., Ho, S.L.: ‘A quantitative comparative analysis of a novel flux-modulated permanent-magnet motor for low-speed drive’, IEEE Trans. Magn., 2010, 46, (1), pp. 127–134.
    13. 13)
      • 22. Tsai, M.C., Ku, L.H.: ‘3-D printing-based design of axial flux magnetic gear for high torque density’, IEEE Trans. Magn., 2015, 51, (11), pp. 1–4.
    14. 14)
      • 17. Johnson, M., Gardner, M.C., Toliyat, H.A.: ‘Analysis of axial field magnetic gears with Halbach arrays’. 2015 IEEE Int. Electric Machines & Drives Conf. (IEMDC), Coeur d'Alene, ID, USA, 2015, pp. 108–114.
    15. 15)
      • 8. Davey, K., McDonald, L., Hutson, T.: ‘Axial flux cycloidal magnetic gears’, IEEE Trans. Magn., 2014, 50, (4), pp. 1–7.
    16. 16)
      • 13. Mezani, S., Atallah, K., Howe, D.: ‘A high-performance axial-field magnetic gear’, J. Appl. Phys., 2006, 99, (8), p. 08R303.
    17. 17)
      • 1. Musial, W., Butterfield, S., , McNiff, B.: ‘Improving wind turbine gearbox reliability’. European Wind Energy Conference & Exhibition 2007, Milan, Italy, May 7–10, 2014, Vol 3, pp. 1770–1780.
    18. 18)
      • 19. Acharya, V.M., Calvin, M., Bird, J.Z.: ‘A low torque ripple flux focusing axial magnetic gear’. 7th IET Int. Conf. on Power Electronics, Machines and Drives (PEMD 2014), Manchester, UK, 2014, pp. 1–6.
    19. 19)
      • 27. Zheng, P., Song, Z., Bai, J., et al: ‘Research on an axial magnetic-field-modulated brushless double rotor machine’, Energies, 2013, 6, (9), pp. 4799–4829.
    20. 20)
      • 18. Acharya, V.M., Bird, J.Z., Calvin, M.: ‘A flux focusing axial magnetic gear’, IEEE Trans. Magn., 2013, 49, (7), pp. 4092–4095.
    21. 21)
      • 29. Uppalapati, K.K., Bomela, W., Bird, J.Z., et al: ‘Construction of a low speed flux focusing magnetic gear’. 2013 IEEE Energy Conversion Congress and Exposition, Denver, CO, USA, 2013, pp. 2178–2184.
    22. 22)
      • 3. Bird, J.: ‘Marine hydrokinetic power take-off using magnetic gearing’. Presented at the 2nd Marine Energy Technology Symp., Seattle, WA, 2014.
    23. 23)
      • 4. McGilton, B., Crozier, R., McDonald, A., et al: ‘Review of magnetic gear technologies and their applications in marine energy’, IET Renew. Power Gener., 2018, 12, (2), pp. 174–181.
    24. 24)
      • 25. Bron, L.: ‘Design and performance evaluation of a magnetically geared axial-flux permanent magnet generator’. MScEng thesis, Stellenbosch University, Stellenbosch, South Africa, 2012.
    25. 25)
      • 23. Dong, K., Yu, H., Hu, M.: ‘Study of an axial-flux modulated superconducting magnetic gear’, IEEE Trans. Appl. Supercond., 2019, 29, (2), pp. 1–5.
    26. 26)
      • 21. Yin, X., Pfister, P.D., Fang, Y.: ‘A novel magnetic gear: toward a higher torque density’, IEEE Trans. Magn., 2015, 51, (11), pp. 1–4.
    27. 27)
      • 24. Wang, R.J., Brönn, L., Gerber, S., et al: ‘Design and evaluation of a disc-type magnetically geared PM wind generator’. 4th Int. Conf. on Power Engineering, Energy and Electrical Drives, Istanbul, Turkey, 2013, pp. 1259–1264.
    28. 28)
      • 15. Hirata, K., Yamamoto, M., Muramatsu, M.: ‘Proposal of an axial gap magnetic gear’, IEEJ Trans. Ind. Appl., 2010, 130, (6), pp. 802–807.
    29. 29)
      • 7. Jorgensen, F.T., Andersen, T.O., Rasmussen, P.O.: ‘The cycloid permanent magnetic gear’, IEEE Trans. Ind. Appl., 2008, 44, (6), pp. 1659–1665.
    30. 30)
      • 14. Johnson, M., Shapoury, A., Boghrat, P., et al: ‘Analysis and development of an axial flux magnetic gear’. 2014 IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, PA, USA, 2014, pp. 5893–5900.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-epa.2018.5931
Loading

Related content

content/journals/10.1049/iet-epa.2018.5931
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading