A global stability of linearizing control with a robust Kalman rotor flux observer of the induction motor

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Abstract
The field oriented control (FOC) can provide the same performance as is achieved from a separately excited DC motor. However, this technique requires the mechanic sensor to determine correctly the orientation of the rotor flux vector and is very sensitive to the variation of motor parameters, results in an undesirable coupling between the flux and the torque of the machine, and loss of dynamic performance. To solve these problems, this paper proposes a global stability and robust nonlinear controller applied to the ideal induction motor speeding system, and dynamic decoupling of rotor speed and flux. A comparative study between the performances of the proposed controller and field oriented control is carried out. In presence of rotor resistance variations and load torque disturbance the simulation results show the proposed control method behaves preferable dynamic decoupling performance and robust performance.

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