Robust Speed Regulation of Induction Motor Subjected to Unknown Load Torque

Induction motors are still the most used in industrial applications due to simplicity of installation and low maintenance cost, especially for squirrel cage type. The significant development power electronics terms high-speed technologies electronic switches, their availability high ratings, considerable decrease cost components supports this increase uses. However, changing induction motor's speed with loading, load torque measurement devices, sensors limit using such motors. This paper proposes a state feedback controller-based backstepping technique robust regulators motor loaded without measuring torque. Designing controller (state controller) needs know value torque, hence values ​​are assumed start design process. A observer as output is integrated into proposed instead measurement. To asset controller's capability keep at desired value, global stability investigated Lyapunov direct theorem. simulation results show that method's effectiveness keeping