1. 1) Motor Gijutu Jituyo Handbook, pp.442-447 (THE NIKKAN KOGYO SHINBUN,LTD,Tokyo,2001).
2. 2) T. Ohara:Nishiyama Kinen Gijutu Kouza, No.155/156, p153 (The Iron and Steel Institute of Japan,1995) (in Japanese).
3. 3) C. Kaido and J. Yamasaki: The Papers of Technical Meeting on Rotating Machinery, IEE Japan, MAG-03-125(2003) (in Japanese).
4. 4) R. M. Bozorth:Ferromagnetism, IEEE press, pp.67-101(1951).
5. 5) C. Kaido and J. Yamasaki:Digests of the 24th Annual Conference on Magnetics in Japan,15pD-2 (2000).