1. Associate Professor, School of Electromechanical Engineering, Guangdong Univ. of Technology, Guangzhou 510006, China.
2. Postgraduate Student, School of Electromechanical Engineering, Guangdong Univ. of Technology, Guangzhou 510006, China.
3. Senior Engineer, School of Electromechanical Engineering, Guangdong Univ. of Technology, Guangzhou 510006, China (corresponding author).
4. Professor, School of Electromechanical Engineering, Guangdong Univ. of Technology, Guangzhou 510006, China.