1. Oita University,Vector Magnetic Characteristic Laboratory,Oita,Japan
2. Nippon Bunri University,Mechanical and Electrical Eng. Department,Oita,Japan
3. Ibraki University,Electrical and Eng. Department,Hitachi,Japan
4. Nippon Kinzoku Co. Ltd.,Tokyo,Japan
5. Tokuden Co., Ltd.,Yamashina,Japan
6. RWTH Aachen University,Institute of Electrical Machines,Aachen,Germany