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3. (3) IEC 60034-30-1: Rotating electrical machines-Part 30-1: Efficiency classes of line operated AC motors (IE code) (2014)
4. (4) Z. Wang, Y. Enomoto, M. Ito, R. Masaki, S. Morinaga, H. Itabashi, and S. Tanigawa: Development of a Parmanent Magnete Motor Utilizing Amorphous Wound Cores, IEEE Transactions on Magnetics, Vol. 46, No. 2 (2010)
5. (5) Hitachi News Release: “Highly Efficient Industrial 11kW Permanent Magnet Synchronous Motorwithout Rare-earth Metals—Realizing IE4 Class Efficiency Standard with a Smaller Motor—”, http://www.hitachi.com/New/cnews/120411.html (2012)