1. Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University, Changzhou 213022, China, also with the College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China, and also with the College of IoT Engineering, Hohai University, Changzhou 213022, China (e-mail: jtfei@hhu.edu.cn)
2. College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China.