PMSM sensorless control using back-EMF based position and speed estimation method

Abstract

The vector control techniques in AC drives demands exact position and speed feedback information for the current and speed control. This paper presents a position and speed estimation method based on the measurement of phase currents and voltages and a pre-knowledge of the machine model. The object is to elaborate a precise estimator in accordance with some specifications, especially the ability to cancel position error. On the other hand, the method provides satisfactory efficiency when used in sensorless control.