volume | PIER Journals

Abstract

This paper presents a novel permanent-magnet (PM) machine for wind power generation. In order to achieve high power/torque density as well as get rid of the nuisances aroused by the mechanical gearbox, a coaxial magnetic gear (CMG) is engaged. Different from the existing integrated machine in which armature windings are deployed in the inner bore of the CMG as an individual part, stator windings are directly inserted among the slots between the ferromagnetic segments in this proposed machine. Thus, it can offer several merits, such as simpler mechanical structure, better utilization of PM materials and lower manufacturing cost. Moreover, by artfully designing the connection of the armature windings, the electromagnetic coupling between the windings and the outer rotor PMs can be dramatically decreased, and the electromechanical energy conversion can be achieved by the field interaction between the inner rotor PMs and the armature windings. This machine adopts an outer-rotor topology, for compact design, the wind blades are directly mounted on the outer rotor of the machine, while the fairing is equipped on the front end of the stator. The design details and operating principle are elaborated. By using the time-stepping finite element method (TSFEM), the electromagnetic characteristics of the proposed machine are analyzed. The results verify the validity of the proposed machine.

1. Negra, N., O. Holmstrom, B. Birgitte, and S. Poul, "Windfarm generation assessment for reliability analysis of power systems," Wind Engineering, Vol. 31, No. 6, 383-400, 2007.
doi:10.1260/030952407784079708 Google Scholar

2. Grauers, A., "Efficiency of three wind energy generator systems," IEEE Trans. Energy Conversion, Vol. 11, No. 3, 650-657, 1996.
doi:10.1109/60.537038 Google Scholar

3. Muller, S., "Doubly fed induction generator system for wind turbines," IEEE Ind. Appl. Magazine, Vol. 8, No. 3, 26-33, 2002.
doi:10.1109/2943.999610 Google Scholar

4. Torrey, D., "Switched reluctance generators and their control," IEEE Trans. Ind. Electron., Vol. 49, No. 1, 3-13, 2002.
doi:10.1109/41.982243 Google Scholar

5. Fan, Y., K. T. Chau, and M. Cheng, "A new three-phase doubly salient permanent magnet machine for wind power generation," IEEE Trans. Ind. Appl. Magazine, Vol. 42, No. 1, 53-59, 2006. Google Scholar

6. Chau, K. T., Y. Li, J. Jiang, and S. Niu, "Design and control of a PM brushless hybrid generator for wind power application," IEEE Trans. Magn., Vol. 42, No. 10, 3497-3499, 2006.
doi:10.1109/TMAG.2006.879436 Google Scholar

7. Niu, S., K. T. Chau, J. Jiang, and C. Liu, "Design and control of a new double-stator cup-rotor permanent-magnet machine for wind power generation," IEEE Trans. Magn., Vol. 43, No. 6, 2501-2503, 2007.
doi:10.1109/TMAG.2007.893713 Google Scholar

8. Chen, J., C. V. Nayar, and L. Xu, "Design and finite-element analysis of an outer-rotor permanent magnet generator for directly coupled wind turbines," IEEE Trans. Magn., Vol. 36, No. 5, 3802-3809, 2000.
doi:10.1109/20.908378 Google Scholar

9. Atallah, K., S. Calverley, and D. Howe, "Design, analysis and realization of a high-performance magnetic gear," IEE Proc. Electric Power Appl., Vol. 151, No. 2, 135-143, 2004.
doi:10.1049/ip-epa:20040224 Google Scholar

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

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

12. Jian, L., K. T. Chau, W. Li, and J. Li, "A novel coaxial magnetic gear using bulk HTS for industrial applications," IEEE Trans. Appl. Superconduc., Vol. 20, No. 3, 981-984, 2010.
doi:10.1109/TASC.2010.2040609 Google Scholar

13. Chau, K. T., D. Zhang, J. Jiang, C. Liu, and Y. Zhang, "Design of a magnetic-geared outer-rotor permanent-magnetic brushless motor for electric vehicles," IEEE Trans. Magn., Vol. 43, No. 6, 2504-2506, 2007.
doi:10.1109/TMAG.2007.893714 Google Scholar

14. Jian, L. and K.-T. Chau, "Design and analysis of a magnetic-geared electronic-continuously variable transmission system using finite element method," Progress In Eletromagnetics Research, Vol. 107, 47-61, 2010.
doi:10.2528/PIER10062806 Google Scholar

15. Jian, L., K. T. Chau, and J. Jiang, "A magnetic-geared outer-rotor permanent-magnet brushless machine for wind power generation," IEEE Trans. Ind. Appl., Vol. 45, No. 3, 954-962, 2009.
doi:10.1109/TIA.2009.2018974 Google Scholar

16. Faiz, J. and B. M. Ebrahimi, "Mixed fault diagnosis in three-phase squirrel-cage induction motor using analysis of air-gap magnetic field," Progress In Eletromagnetics Research, Vol. 64, 239-255, 2006.
doi:10.2528/PIER06080201 Google Scholar

17. Vaseghi, B., N. Takorabet, and F. Meibody-Tabar, "Transient finite element analysis of induction machines with stator winding turn fault," Progress In Eletromagnetics Research, Vol. 95, 1-18, 2009.
doi:10.2528/PIER09052004 Google Scholar

18. Faiz, J., B. M. Ebrahimi, and M. B. B. Sharifian, "Time stepping finite element analysis of broken bars fault in a three-phase squirrel-cage induction motor," Progress In Eletromagnetics Research, Vol. 68, 53-70, 2007.
doi:10.2528/PIER06080903 Google Scholar

19. Chari, M. V. K., G. Bedrosian, J. D'Angelo, A. Konrad, G. M. Cotzas, and M. R. Shah, "Electromagnetic field analysis for electrical machine design," Progress In Eletromagnetics Research, Vol. 04, 159-211, 1991. Google Scholar

20. Touati, S., R. Ibtiouen, O. Touhami, and A. Djerdir, "Experimental investigation and optimization of permanent magnet motor based on coupling boundary element method with permeances network," Progress In Eletromagnetics Research, Vol. 111, 71-90, 2011.
doi:10.2528/PIER10092303 Google Scholar

21. Lecointe, J.-P., B. Cassoret, and J. F. Brudny, "Distinction of toothing and saturation effects on magnetic noise of induction motors," Progress In Eletromagnetics Research, Vol. 112, 125-137, 2011. Google Scholar

22. Ravaud, R. and G. Lemarquand, "Comparsion of the coulombian and amperian current models for calculating the magnetic field produced by radially magnetized arc-shaped permanent magnets," Progress In Eletromagnetics Research, Vol. 95, 309-327, 2009. Google Scholar

23. Tian, J., Z.-Q. Lv, X.-W. Shi, L. Xu, and F. Wei, "An efficient approach for multiforntal algorithm to solve non-positive-definite finite element equations in electromagnetic problems," Progress In Eletromagnetics Research, Vol. 95, 121-133, 2009.
doi:10.2528/PIER09070207 Google Scholar

24. Ping, X. W. and T.-J. Cui, "The factorized sparse approximate inverse preconditioned conjugate gradient algorithm for finite element analysis of scatering problems," Progress In Eletromagnetics Research, Vol. 98, 15-31, 2009.
doi:10.2528/PIER09071703 Google Scholar

25. Chen, J. and Q. H. Liu, "A non-spurious vector spectral element method for maxwell's equations," Progress In Eletromagnetics Research, Vol. 96, 205-215, 2009.
doi:10.2528/PIER09082705 Google Scholar

26. Chau, Y.-F., H.-H. Yeh, and D. P. Tsai, "A new type of optical antenna: plasmonics nanoshell bowtie antenna with dielectric hole," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 11-12, 1621-1632, 2010.
doi:10.1163/156939310792149588 Google Scholar

27. Khalilpour, J. and M. Hakkak, "Controllable waveguide bandstop filter using S-shaped ring resonators," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 5-6, 587-596, 2010.
doi:10.1163/156939310791036458 Google Scholar

Dr. Linni Jian

Dr. Guoqing Xu

Dr. Yu Gong

Mr. Jianjian Song

Dr. Jianing Liang

Mr. Ming Chang