volume | PIER Journals

Abstract

This paper presents a new non-rare-earth axial-field magnetic variable gear (MVG). By real-time changing the numbers of permanent magnet (PM) pole-pairs in the input and output rotors, the gear ratio becomes controllable. The key is to propose a new stationary ring integrated with magnetizing windings in such a way that various PM pieces can be independently magnetized to form different pole-pair numbers. After introducing the unique features of the non-rare-earth PM material aluminum-nickel-cobalt (AlNiCo), the proposed topology and design principle are discussed. By using finite element analysis, the electromagnetic performances of the proposed MVG under different gear ratios are analyzed. In particular, the corresponding torque transmission capability is assessed, and the influence caused by the introduction of the magnetizing windings is discussed. Hence, the validity of the proposed MVG can be verified.

1. Chau, K. T. and C. C. Chan, "Emerging energy-efficient technologies for hybrid electric vehicles," Proceedings of IEEE, Vol. 95, No. 4, 821-835, 2007.
doi:10.1109/JPROC.2006.890114 Google Scholar

2. Chau, K.-T., W. Li, and C. H. T. Lee, "Challenges and opportunities of electric machines for renewable energy," Progress In Electromagnetics Research B, Vol. 42, 45-74, 2012.
doi:10.2528/PIERB12052001 Google Scholar

3. Nakamura, K., M. Fukuoka, and O. Ichinokura, "Performance improvement of magnetic gear and efficiency comparison with conventional mechanical gear," Journal of Applied Physics, Vol. 115, 17A314, 2014.
doi:10.1063/1.4863809 Google Scholar

4. Jian, L., K. T. Chau, Y. Gong, J. Z. Jiang, C. Yu, and W. Li, "Comparison of coaxial magnetic gears with different topologies," IEEE Transactions on Magnetics, Vol. 45, No. 10, 4526-4529, 2009.
doi:10.1109/TMAG.2009.2021662 Google Scholar

5. Jian, L. and K.-T. Chau, "Analytical calculation of magnetic field distribution in coaxial magnetic gears," Progress In Electromagnetics Research, Vol. 92, 1-16, 2009.
doi:10.2528/PIER09032301 Google Scholar

6. Li, X., K.-T. Chau, M. Cheng, and W. Hua, "Comparison of magnetic-geared permanent-magnet machines," Progress In Electromagnetics Research, Vol. 133, 177-198, 2013.
doi:10.2528/PIER12080808 Google Scholar

7. Atallah, K. and D. Howe, "A novel high-performance magnetic gear," IEEE Transactions on Magnetics, Vol. 37, No. 4, 2844-2846, 2001.
doi:10.1109/20.951324 Google Scholar

8. Rasmussen, P. O., T. O. Andersen, F. T. Jorgensen, and O. Nielsen, "Development of a high-performance magnetic gear," IEEE Transactions on Industry Applications, Vol. 41, No. 3, 764-770, 2005.
doi:10.1109/TIA.2005.847319 Google Scholar

9. Liu, X., K. T. Chau, J. Z. Jiang, and C. Yu, "Design and analysis of interior-magnet outer-rotor concentric magnetic gears," Journal of Applied Physics, Vol. 105, 07F101, 2009. Google Scholar

10. Jian, L. and K. T. Chau, "A coaxial magnetic gear with Halbach permanent magnet arrays," IEEE Transactions on Energy Conversion, Vol. 25, No. 2, 319-328, 2010.
doi:10.1109/TEC.2010.2046997 Google Scholar

11. Chau, K. T., Electric Vehicle Machines and Drives - Design, Analysis and Application, Wiley-IEEE Press, 2015.
doi:10.1002/9781118752555

12. Sun, X., M. Cheng, W. Hua, and L. Xu, "Optimal design of double-layer permanent magnet dual mechanical port machine for wind power application," IEEE Transactions on Magnetics, Vol. 45, No. 10, 4613-4616, 2009.
doi:10.1109/TMAG.2009.2021526 Google Scholar

13. Chen, M., K. T. Chau, W. Li, C. Liu, and C. Qiu, "Design and analysis of a new magnetic gear with multiple gear ratios," IEEE Transactions on Applied Superconductivity, Vol. 24, No. 3, 0501904, 2014. Google Scholar

14. Mezani, S., K. Atallah, and D. Howe, "A high-performance axial-field magnetic gear," Journal of Applied Physics, Vol. 99, 08R303, 2006. Google Scholar

15. Li, W. and K.-T. Chau, "Analytical field calculation for linear tubular magnetic gears using equivalent anisotropic magnetic permeability," Progress In Electromagnetics Research, Vol. 127, 155-171, 2012.
doi:10.2528/PIER12030301 Google Scholar

16. Lee, C. H. T., K. T. Chau, C. Liu, T. W. Ching, and F. Li, "A high-torque magnetless axial-flux doubly-salient machine for in-wheel direct drive applications," IEEE Transactions on Magnetics, Vol. 50, No. 11, 8202405, 2014. Google Scholar

17. Kramer, M. J., R. W. McCallum, I. A. Anderson, and S. Constantinides, "Prospects for non-rare-earth permanent magnets for traction motors and generators," Journal of the Minerals, Metals and Materials Society, Vol. 64, No. 7, 752-763, 2012.
doi:10.1007/s11837-012-0351-z Google Scholar

18. Chen, M., K. T. Chau, W. Li, and C. Liu, "Development of non-rare-earth magnetic gears for electric vehicles," Journal of Asian Electric Vehicles, Vol. 10, No. 2, 1607-1613, 2012.
doi:10.4130/jaev.10.1607 Google Scholar

19. Chen, M., K. T. Chau, W. Li, and C. Liu, "Cost-effectiveness comparison of coaxial magnetic gears with different magnet materials," IEEE Transactions on Magnetics, Vol. 50, No. 2, 7020304, 2014.
doi:10.1109/TMAG.2013.2281988 Google Scholar

20. Ostovic, V., "Pole-changing permanent-magnet machines," IEEE Transactions on Industry Applications, Vol. 38, No. 6, 1493-1499, 2002.
doi:10.1109/TIA.2002.805568 Google Scholar

21. Ostovic, V., "Memory motors," IEEE Industry Applications Magazine, Vol. 9, No. 1, 52-61, 2003.
doi:10.1109/MIA.2003.1176459 Google Scholar

22. Yu, C., K. T. Chau, and J. Z. Jiang, "A flux-mnemonic permanent magnet brushless machine for wind power generation," Journal of Applied Physics, Vol. 105, No. 7, 07F114, 2009. Google Scholar

23. Yu, C. and K. T. Chau, "Design, analysis and control of DC-excited memory motors," IEEE Transactions on Energy Conversion, Vol. 26, No. 2, 479-489, 2011.
doi:10.1109/TEC.2010.2085048 Google Scholar

Dr. Mu Chen

Prof. Kwok-Tong Chau

Dr. Christopher H. T. Lee

Dr. Chunhua Liu