This book is supported by Jiangsu University of Science and Technology. Permanent Magnet Synchronous Motors (PMSMs) have become one of the most important electromechanical energy conversion devices in modern industry owing to their advantages of high efficiency, high power density, fast dynamic response, and excellent control performance. With the rapid development of electric vehicles, advanced manufacturing systems, aerospace equipment, renew-able energy generation, and intelligent robotics, increasingly stringent requirements have been imposed on motor drive systems in terms of operating speed range, torque capability, robustness, efficiency, and reliability. Consequently, advanced control strategies for PMSMs have attracted extensive attention from both academia and industry.