Sensorless Control of DTP-SynRM With Hybrid Flux Observer and Disturbance Observer Considering Magnetic Saturation and Cross-Coupling Effect

This paper proposes a sensorless control method for dual three-phase synchronous reluctance motor (DTP-SynRM) utilizing an improved hybrid flux observer to compensate position estimation errors caused by magnetic saturation and cross-coupling effects. A hybrid flux observer based on the current model and voltage model is used to extend the operational speed range of the system. The impact of inductance nonlinearity and mutual inductance caused by magnetic saturation and cross-coupling effects on the position observation accuracy is thoroughly analyzed. Based on this analysis, a compensation method is introduced to improve the position observation accuracy under these conditions. Additionally, a disturbance observer based on the extended state observer (ESO) is introduced to improve the system's robustness to external and internal disturbances. An experimental platform was built to validate the proposed method, with experimental results demonstrating its effectiveness and feasibility.