Controle de posição do motor de indução por modos deslizantes: uma análise comparativa

Abstract

Modern industrial processes require stringent requirements, such as efficiency, performance dynamic, flexible operating characteristics, diagnostics facilities and communication with a main computer. With the development of micro- electronics and power devices there has been a trend in the use of digital controllers to obtain the characteristics mentioned above. In those processes, the use of eletromechanical energy conversion are shown in many type of driver’s machine. Thus it is commom to find electric motors in this aplications. Then, this work uses a methodology of control for a three phase induction motor of type “squirrel cage” using the technique Sliding Mode Control (SMC). After that, It was applied the methodology for position control of the motor. This work, also proposes a comparison of the proposed technique with other classical technique for this type of aplications. The name of the classical technique is Field Oriented Control (FOC). Therefore, a Digital Signal Controller (DSC) was programmed for both techiniques and applied in the positioning of the inductionmotor. After the comparative analyse, it’s noted that SMC technique was better than FOC technique. Both in computational performance as in the control of motor positions the Slide Mode Control technique has been shown more efficient and robust. Also a reduction in errors of the motor’s current and a better tracking of the reference position was obtained with this technique.