• C. G. C. Neves
  • A. F. F. Filho



magnetic gear, permanent magnet generator, wind power, eletromagnetic concepts, cogging torque


In this paper the magnetic geared machines electromagnetic concepts are introduced. The magnetic gear modulation mechanism which becomes possible rotors of different polarities produce torque is explained, through the use analytical expressions and plots obtained by finite elements method. This pedagogical approach is a way to teach the subject in a more understandable way and, at the same time, it reinforces the application of electromagnetic concepts. Further, a magnetic geared generator is simulated and no-load EMFs and torques are analyzed.


[1] Umans, S. Fitzgerald and Kingsley’s Electric Machinery, McGraw-Hill, 2013.
[2] Brönn, L. Design and Performance Evaluation of a Magnetically Geared Axial-Flux Permanent Magnet Generator. Thesis: MScEng
[3] Chau, K. T., “A Novel Coaxial Magnetic Gear Using Bulk HTS for Industrial Applications,” IEEE Trans. Appl. Supercond., vol. 20,
no. 3, pp. 981–984, Jun. 2010.
[4] Jian, L., K.T. Chau, "Analytical calculation of magnetic field distribution in coaxial magnetic gears", Progress In Electromagnetics
Research, Vol. 92, pp. 1-16, 2009.
[5] Atallah, K. and D. Howe, “A novel high-performance magnetic gear," IEEE Transactions on Magnetics, Vol. 37, No. 4, pp. 2844-
2846, 2001.
[6] Lian, L; Chau, K.-T; Gong, Y; Jiang, JZ; Yu, C; Li, W, ”Comparison of coaxial magnetic gears with different topologies”, IEEE
Transactions On Magnetics, , Vol. 45, n. 10, p. 4526-4529, 2009
[7] Atallah, K., S. D. Calverley, and D. Howe, “Design, analysis and realization of a high-performance magnetic gear," IEE Proc. Electr.
Power Appl., Vol. 151, No. 2, pp. 135-143, 2004.
[8] X. Li, K.-T. Chau, M. Chengand, W. Hua, “Comparison of magnet-geared permanent-magnet machines,” Progress In
Electromagnetics Research, Vol. 133, No. 3, pp. 177-198,2013
[9] B. Davat, Z. Ren and M. Lajoie-Mazenc, “The movement in field modeling,” IEEE Trans. Magn., vol. 21, no. 6, pp. 2296–2298,
November 1985.
[10] B. Silwal, P. Rasilo, L. Perkkio, A. Hannukainen, T. Eirola and A. Arkkio, “Evaluation and Comparison of different numerical
computation methods for the electromagnetic torque in electrical machines,” in Proc. Int. Conf. Electrical Machines and Systems, Oct
2013, pp.837–842.
[11] J. Coulomb and G. Meunier, “Finite element implementation of virtual work principle for magnetic or electric force and torque
computation,” IEEE Trans. Magn., vol. 20, no. 5, pp.1894–1896, 1984.




How to Cite

C. G. C. Neves, & A. F. F. Filho. (2017). MAGNETIC GEARING ELECTROMAGNETIC CONCEPTS. Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe), 16(1), 108–119.



Regular Papers