A. Chiba, Y. Takano, M. Takeno, T. Imakawa, N. Hoshi, M. Takemoto, and S. Ogasawara, "Torque density and efficiency improvements of a switched reluctance motor without rare-earth material for hybrid vehicles," IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, vol. 47, May/Jun. 2011.
D. G. Dorrell, A. M. Knight, and M. Popescu, "Performance improvement in high-performance brushless rare-earth magnet motors for hybrid vehicles by use of high flux-density steel," IEEE Transactions on Magnetics, vol. 47, no. 10, Oct. 2011.
B. K. Lee, G. H. Kang, J. Hur, and D. W. You: "Design of Spoke type BLDC Motors with High Power Density for Traction Applications", Proceedings of IEEE-IASAnnual Meeting, vol.2, pp. 1068-1074 (2004).
K. Y. Hwang, S. B. Rhee, J. S. Lee, and B. I. Kwon: "Shape Optimization of Rotor Pole in Spoke type Permanent Magnet Motor for Reducing Partial Demagnetization Effect and Cogging Torque", Proceedings of Int. Conf. on Electrical Machines and Systems, pp. 955-960 (2007).
K. K. Han, D. Y. Lee, G. H. Kang, K. B. Jang, H. K. Shin, and G. T. Kim, "The Design of Rotor and Notch to Improve the Operation Characteristics in Spoke type BLDC Motor", Proceedings of Int. Conf. on Electrical Machines and Systems, pp. 3121-3125 (2008).
B. Y. Yang, K. Y. Yun, and B. I. Kwon, ""Designing method of flux barriers in rotor for reducing cogging torque," in COMPUMAG2005, Shenyang, China, June 2005, IV-26, PG1-7.
E.S. Hamdi, DESIGN OF SMALL ELECTRICAL MACHINES, John Wiley & Sons Ltd, 1994.
Z. Q. Zhu, S. Ruangsinchaiwanich, N. Schofield, and D. Howe, "Reduction of Cogging Torque in Interior-Magnet Brushless Machines," IEEE Transaction on Magnetics, Vol. 39, No. 5, pp. 3238-3240, September, 2003.
C. Breton, J. Bartolome, J. A. Benito, G. Tassinario, I. Flotats, C. W. Lu, and B. J. Chalmers, "Influence of machine symmetry on reduction of cogging torque in permanent-magnet brushless motors," Magnetics, IEEE Transactions on, Vol. 36, No. 5, pp. 3819, 2000.
L. Touzhu and G. Slemon, "Reduction of cogging torque in permanent magnet motors," Magnetics, IEEE Transactions on, Vol. 24, No. 6, pp. 2901, 1988.
K. Chang Seop, Y. Hee Soo, N. Ki Woong, and C. Hong Soon, "Magnetic pole shape optimization of permanent magnet motor for reduction of cogging torque,"
D. C. Hanselman, Brushless Permanent Magnet Design, McGraw-hill Inc. 1994.