1. (1) K. Sakai: “Technological Trend in Motors for Electric Vehicles”, JIASC IEEJ, 2-S10-4, pp. II-154-157 (2004) (in Japanese)
2. (2) G. Zhou, T. Miyazaki, S. Kawamata, and D. Kaneko: “Efficiency Performance Measurement of Variable Magnetic Flux Motor for Vehicle”, 2010 National Convention Record, IEEJ, 5-014, pp. 22-23 (2010) (in Japanese)
3. (3) K. Sakai and S. Kuramochi: “Principle and Basic Characteristics of Hybrid Variable-Magnetic-Force Motor”, IEEJ Trans. IA, Vol. 131, No. 9, pp. 1112-1119 (2011) (in Japanese)
4. (4) T. Nonaka, M. Hirayama, and M. Ohto: “Using high strength steel plates for rotor core of IPM motor, and evaluation”, The 22nd Symposium on Electromagnetics and Dynamics, 20A4-3, pp. 286-291 (2010) (in Japanese)