Control of an Induction Motor with PI Controller or with Sliding Mode Controller

Three phase induction motors are very widely used in industry that in some fields no other type of electric machines can be found. An a.c. motor drive connected to a load, directly or through a transmission gearbox, with the necessary control, supply and embedded systems such as microprocessors, power electronic converters, transformers and sensors constitute an electric drive system.[Jean Pierre, B., and Wilfrid, P. 2002]. The speed of an induction motor can be changed over a wide range by varying the supply voltage, frequency, slip, and poles. Changing the number of poles is a very known technique, and if the motor has that possibility, it is then easily to shift from one speed level into another by simply changing the position of the right switch . [Benalla, H., Toufouti, R., and Meziane, S. 2006., Di, Zhao, G., Narayanan, and Raja, Ayyanar, 2004]. In this paper, sliding mode controller is designed, which results in good speed control and good performance for induction motion. Control schematic diagrams and units developed in this paper for the gain and band width of the controller are obtained for rotor resistance variation, model in accuracies and load disturbance, to have an ideal speed tracking. The chattering effect is also taken into consideration. The controller is simulated under various conditions and a comparative study of the results with those of PI controller has been presented. For sliding mode controller, Lyaponov stability method is applied to keep the nonlinear system under control. The sliding mode approach is method in which a higher-order system is transformed into first-order system. In that way, simple control algorithm can be applied, which is very straightforward and robust.

並列關鍵字

Induction Motor Drive ； PI Controller ； Sliding Mode Controller ； Chattering Effect

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