Position sensorless control of synchronous reluctance motor based on stator phase current differentiation

In the high-performance control of synchronous reluctance motors (SynRM), the rotor position must be determined, so a position sensor is usually used. However, it increases the cost of the drive control system and reduces reliability. For this problem and combined with the basic characteristics of synchronous reluctance motor, a position sensor-less vector control technique based on stator phase current differentiation is investigated, which can accurately track the rotor position at both low and high speeds. The method is based on the mathematical model of synchronous reluctance motor and its convex pole effect of the rotor. The three-phase phase current differential is obtained by differentiating the stator phase current, and the rotor position is calculated from the resulting three-phase phase current differential to perform sensor-less vector control. The simulation model was built, and the correctness of the algorithm was verified on the matlab/simulink simulation platform. Finally, the reliability of the algorithm was verified on a physical experimental platform of a synchronous reluctance motor for both low and high speeds.