Investigation of Stator Flux Linkage and Torque Predictive Algorithms in a Motor Direct Torque Control System

The predictions of the stator linkage and the torque are not only the important steps in Direct Torque Control (DTC) system, but also one of the input parameters to select the suitable space voltage vectors. In order to overcome the effect of calculation models and the stator resistance on the predictive precision of linkage, a new algorithm based on the predictive calculation to predict the stator linkage and the torque is proposed in this paper. The basic ideology, the detail derived process and equations in different steps of this new algorithm are provided as well. This algorithm can effectively reduce the torque ripple and increase the static and dynamic features of the DTC system.