Research on PMSM Sensorless Control Based on Improved Synovial Observer Algorithm

The synovial observer algorithm is widely used in practical production because it does not require high system accuracy and is insensitive to external changes. The traditional synovial observer algorithm will cause the system chattering. Therefore, an improved synovial observer algorithm is proposed, specifically: 1. The Tanx function is introduced to replace the symbolic function; 2. An inverse observer is introduced to obtain the back EMF; 3. PLL is introduced to replace Arctanx function. In this paper, the PMSM sensorless control block diagram based on the improved sliding film observer algorithm is constructed, and the motor speed, position and back EMF are studied. The model simulation is carried out on the MATLAB/Simulink platform to verify that the improved sliding film observer algorithm can achieve the rotor position and speed tracking effect, and has a good system chattering suppression effect, which can meet the actual production requirements.