Enhanced speed sensorless DTC algorithm for asynchronous motor with long cables

Introduction To address the limitations of direct torque control in handling long cable configurations, this study proposes an enhanced direct torque control algorithm. Methods The proposed method employs Kirchhoff functions to calculate motor-side voltage and current, thereby improving control performance. To validate the proposed approach, Lyapunov stability analysis is conducted on the system function incorporating long cable and filter models. Furthermore, time parameters are introduced to verify system stability, confirming that the system remains stable in metastable states. Results Simulation and experimental results demonstrate that the torque improvement is most pronounced during rated-load startup. Experimental data confirm that the proposed method exhibits the most significant suppression of torque oscillations. Discussion Future work will focus on refining the algorithm to further address long cable power supply challenges.