High-precision Rotor Position Estimation for High-speed SPMSM Drive Based on State Observer and Harmonic Elimination

A sensorless field-oriented control scheme (FOC) based on state observer is proposed. The estimated position and speed fluctuations caused by the high-order harmonics are analyzed. A harmonics filter is used to eliminate the harmonics. A high-speed surface-mounted permanent magnet synchronous motor (SMPSM) drive testbench is built to demonstrate the proposed control scheme. It is shown in the experimental results that the proposed method can significantly reduce the fluctuations of estimated position and speed.