Robust sensorless speed control purpose for induction motors

This paper deals with a new approach of robust sensorless speed control intended to the induction motors. The speed estimation is done from the double use of the so-called self-control process (SCP) of the induction machine which characterizes the relationship between the stator, rotor and mechanical frequencies. Hence, in this approach, the output torque-current controller generates the so-called speed-command instead of the conventional rotor-frequency-command. This speed-command gives the estimated speed which added to estimated-rotor-frequency provides the required stator-frequency-command. The conducted simulation and experiment tests attest favorably the robustness, the effectiveness and the simplicity of the proposed approach.