A Simulation Study on Sensorless Control of Permanent Magnet Synchronous Motor Drives

Abstract-- This paper presents simple methods for controlling MATLAB/SIMtJLINK environment under which the permanent-magnet synchronous motors (PMSM) over a wide speed range simulation results are obtained. without using a shaft position and speed sensor. In classical estimation methods the voltage and current vectors are the input to the estimator, while the rotor position and speed are the output of the estimator. To avoid II. SPEED AND CURRENT CONTROLLER the drawback of differential and integral operations in conventional sensorless PMSM drives a recursive approach for estimation of the rotor Fig. 1 shows a schematic diagram of the proposed sensorless speed and angle is proposed and investigated. The position and speed PMSM drive. estimations are based on the back electromotive force (BEMF) method in Sensorl-ess con-trailerthe afl-stator reference frame. Two estimation strategies, one using the steady-state equations and the other using the dynamic equations, are speedcom,aSpeed compared. Extensive simulation results are given and discussed. controllecontrollerl 1