1. School of Electrical and Electronics Engineering, Huazhong University of Science and Technology, Wuhan, China
2. Electrical and Electronics Engineering, Center for Advanced Electrical Machines & Drives, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, China
3. University of Nottingham, Nottingham, U.K.
4. State Grid Wuhan Electric Power Supply Company, Wuhan, China