Sensor-Less Complex System Control of PMSM Based on Improved SMO

The sensor-less control system of PMSM is complicated, and it is of great significance to carry out accurate mathematical modeling and simulation analysis. PMSM is small in size, high in efficiency, and low in noise, so it is very popular in AC motor applications. They have been widely used in various electrical appliances such as machine tools, robots, and household appliances. In order to reduce the high-frequency chatter of the sensor-less control strategy of permanent magnet synchronous motors, a sensor-less control method based on improved SMO is proposed. The back-EMF component in the static coordinate system is obtained through the SMO. The back-EMF component undergoes closed-loop feedback to eliminate the high-frequency components. The back-EMF component is calculated by an improved PLL to obtain the position and speed of the rotor to improve system performance. At the end of the article, the feasibility is proved by comparing it with the simulation of conventional SMO-PLL.