Stability Analysis of Adaptive Full-Order Observer for Open-End Winding Five-Phase Induction Motor

Abstract

Open-End Winding Five-Phase Induction Motors (OEW-FPIM) are employed in high power applications where the reduction in the total power per phase and the highest level of overall system reliability is required. This paper deals with the stability problem of adaptive full-order observer (AFO) for speed-sensorless direct torque control (DTC) of an open-end winding five-phase induction motor. The stability of proposed observer is demonstrated through Lyapunov theorem. The proposed solution leads to improve the robustness of the drive system. The complete sensorless DTC with proposed observer is successfully implemented in real time using a digital signal processor board DSpace DS1103 for a laboratory 2.2 kW FPIM drive. The obtained results confirm the enhanced performance and the clear efficacy of the proposed control technique under a variety of cases of different operating conditions.