Quick and smooth speed servo system considering acceleration torque and THD for AC servo motor

Abstract

This paper proposes a quick and smooth speed servo system considering acceleration torque and total harmonic distortion (THD) for AC servo motor, which realizes both a quick speed response in trasient state and a small value of THD in steady state. The proposed system has a new space voltage vector modulation (SVM) inverter, which is the mixed voltage limitation method of SVM. The proposed method achieves the fine performance in the experimental results of surface permanent magnet synchronous motor (SPM motor).

New Approach to Modeling the Direct Torque Control Applied to the Asynchronous Machine, Reduction of Undulations on the Torque

“…The method of Field acceleration overcomes the computational problem of vector controllers by achieving some computational reductions [3], [2], [4]. And the technique of Direct Torque Control (DTC), that has been developed by Takahashi [5], [6], [7], [8], permits to control directly the stator flux and the torque by using an appropriate voltage vector selected in a look-up table. The main advantages of DTC are a minimal torque response time and the absence of: coordinate-transform, voltage modulator-block, controllers such as PID for flux and torque.…”