Abstract: In the long cable driven induction motor drive systems，speed sensorless control is usually adopted

due to the long distance between the controller and the motor. In addition，long cable increases the stator side

impedance of the induction motor，especially the equivalent stator resistance by an order of magnitude，which

increases the impact of the temperature drift of the stator resistance on the flux observation and reduces the

performance of the flux observer. A magnetic flux observation method with strong stator resistance robustness was

proposed for induction motor drive systems powered by long cables.. This method improves the traditional hybrid

model flux observer，a model reference adaptive speed observer that is completely robust to the stator resistance

was used to obtain the speed，meanwhil，the current model was used to calculate the rotor flux，and this flux

calculation process was used to replace the original current model. The flux calculation process is completely robust

to the stator resistance，so the robustness of the observer to the stator resistance is improved. Hardware-in-the-loop （HIL）test results verify the feasibility and effectiveness of this method.

      Key words: long cable driven；high power induction motor drive；speed sensorless control；flux observer robust on stator resistance