A rotor position estimation method based on fuzzy PI for SPMSM sensorless control

This paper focuses on the high frequency current injection method for sensorless control of surface mounted permanent magnet synchronous machines (SPMSM) at low speed. In sensorless control of injection method, a PI close loop is needed to estimate the rotor position. However, constant PI parameters are unable to achieve optimal control effect in both process of dynamic and steady-state. In this paper, fuzzy PI position observer is proposed to realize the real-time parameter adjustment. Simulation and experimental results show that fuzzy PI position observer improves the precision of rotor position estimation and ensures the quickness of the rotor position estimation simultaneously.