Senseless Control Method for PMSM Based on Full Speed Range Observer

Due to a series of reasons such as increased costs, installation errors, and sensor failures caused by the use of speed sensors, speed sensorless control technology for permanent magnet synchronous motors has emerged. However, the common speed sensorless control method requires the motor speed to be within a certain range in order to accurately estimate the motor speed. Therefore, this article combines the speed sensorless control method of permanent magnet synchronous motor based on sliding film observation and the speed sensorless control method of permanent magnet synchronous motor based on high-frequency signal injection, and proposes a speed sensorless control method of permanent magnet synchronous motor based on full speed range observer. Finally, the effectiveness of the control method in the full speed range was verified through simulation.