Dynamic Performance Comparison of Speed and Position Estimators in Sensorless IPMSM Drives

This study investigates a study of the estimator performance of a position sensorless control based on backelectromotive force (back-EMF) estimation in an interior permanent magnet synchronous motor (IPMSM).The characteristic of the estimated back-EMF signals is analyzed using various mathematical models of the IPMSM.Sensorless control based on the extended electromotive force (EMF) model in the rotor reference frame incorporates a back-EMF estimator, such as a disturbance observer, and a rotor position estimator, which may be implemented using either a phaselocked loop (PLL) or a Luenberger observer (LO).To compare the transient performance of rotor position estimators, the design and gain selection methods of estimators are introduced.And, the effect of current sensor error has been figured out that the estimated speed error and position error are directly affected.The feasibility of the introduced estimator and current error effect are verified through simulation results.