1. Faculty of Mechanical and Electrical Engineering, Yunnan Key Laboratory of Intelligent Control and Application, Kunming University of Science and Technology, Kunming, P. R. China
2. Faculty of Information Engineering and Automation, Yunnan International Joint Laboratory of Intelligent Control and Application of Advanced Equipment, Kunming University of Science and Technology, Kunming, P. R. China
3. Department of Electromechanical Engineering, University of Macau, Taipa, Macau, China