A sensorless direct torque control technique for permanent magnet synchronous motors

Abstract

A sensorless control strategy for permanent magnet synchronous motors (PMSM) is presented in this paper. A direct torque control (DTC) scheme based on the measurement and observation of stator current and flux vectors is proposed. The rotor position and actual torque is estimated through the stator flux estimation. Stator flux and voltage vectors are calculated according to the error between the actual and command torque to obtain the desired torque. Computer simulation and experimental results are presented to demonstrate the effectiveness of the proposed scheme.