Estimation Error Analysis of Stator Flux Observer for DTC-Based PMSM Drives

Direct torque control can be applied to any AC motor drive and requires an estimation of stator flux linkage. The stator flux observer was developed for this solution. However, there are few reports about the way of the observer design. This paper analyzes the influence of the armature resistance error in the stator flux observer and proposes the way of the design for PMSM drives.