Sensorless estimation and convergence analysis based on MRAS for PMSM

The sensorless estimation principle of rotor speed and position for PMSM by MRAS is given, simulation models are made, simulation results are obtained. Steady estimation errors of speed and position are analyzed after motor parameters change by simulation, dynamic estimation responses and convergence are analyzed under sudden increasing load. Steady speed estimation error can be restrained by PI controller under different parameters change, dynamic estimation performances are different under sudden load change, which depends mainly on system structure and PI controller performance.