1. School of Mechatronics and Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
2. Key Laboratory of Conveyance and Equipment of Ministry of Education, East China Jiaotong University, Nanchang 330013, China
3. Institute of Precision Machining and Intelligent Equipment Manufacturing, East China Jiaotong University, Nanchang 330013, China
4. School of Electrical and Information Engineering, Hunan University, Changsha 410006, China
5. Faculty of Electrical Engineering and Information Technology, Otto-von-Guericke University of Magdeburg, 39106 Magdeburg, Germany
6. Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
7. CRRC Changchun Railway Vehicles Corporation Limited, 435 Qingyin Road, Changchun 130062, China