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Sensorless Control of Induction Motor Using Second-Order Sliding Mode Algorithms

In this paper, the robust second-order sliding mode control has been applied to induction machine drives. To beat the phenomenon of chattering that is the major disadvantage of conventional sliding mode control, a continuous algorithm has supplanted the discontinuous function. It is known that stochastic measurement noise can still induce the chattering phenomenon in control signals. So in order to eliminate the need of utilizing regulators and sensors, second-order sliding mode (SOSM) observers have been introduced and used both for control and for generating the rotor speed and the rotor flux estimates requisite for the controllers. The proof of stability of algorithm is also presented. It is confirmed through simulation that the used observer converges in a finite time and allows giving a good estimate of speed and flux even in presence of stator resistance and moment inertia variations.