"无位置传感器控制下的永磁无刷直流电机技术研究"

"Dr. Wang Huabin's doctoral thesis on sensorless control of permanent magnet brushless DC motors based on indirect inductance method is a valuable study in the field of electrical engineering. His research focuses on the elimination of position sensors in order to save space and increase the reliability of the motor, especially in harsh environments where traditional sensors may not be suitable. The key challenge in sensorless control of permanent magnet brushless DC motors lies in accurately estimating the rotor position throughout the entire speed range. While existing control methods are effective in the medium to high-speed range, they often struggle in low-speed, very low-speed, or stationary operation due to the small or zero back electromotive force amplitude. Dr. Wang's thesis addresses this challenge by proposing a new sensorless control method specifically tailored for internal permanent magnet rotor structures, which are commonly used in household appliances and electric vehicles. By harnessing the convex pole effect inherent to these rotor designs, the proposed method enhances the motor's starting performance and overload capacity. This innovative approach provides a solution to the longstanding issue of sensorless control in low-speed scenarios, offering a promising direction for future research in the field. Overall, Dr. Wang Huabin's doctoral thesis significantly contributes to the advancement of sensorless control technology for permanent magnet brushless DC motors, highlighting the importance of innovative solutions in improving motor performance and reliability across various operating conditions."