Sensorless Vector Control of Permanent Magnet Synchronous Motors Based on Sliding Mode Observer

This paper presents a sensorless vector control approach for permanent magnet synchronous motors (PMSM) utilizing sliding mode observers. The method applies to motor control systems by implementing vector control principles to regulate motor current and rotational speed. A key implementation feature involves employing sliding mode observers to estimate rotor position information, eliminating the need for physical position sensors. The control algorithm typically incorporates Park/Clarke transformations for dq-axis current regulation and space vector PWM for inverter control. To validate the method's effectiveness, we developed a Simulink simulation model featuring real-time observer implementation and dynamic performance analysis. Simulation results demonstrate high control accuracy and robustness, with the sliding mode observer providing stable position estimation under varying load conditions. The study confirms this method's practical applicability through comprehensive performance evaluation and stability analysis.