1. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
2. Key Laboratory of Opto-technology and Intelligent Control, Ministry of Education, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
3. Hebei Key Laboratory of Electromagnetic Environmental Effects and Information Processing, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
4. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
5. School of Electrical Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China