MINIMIZATION OF COMPLEXITY OF INDUCTION MOTOR DRIVE BY NOVEL VECTOR CONTROL ALGORITHM

This paper presents switching tables based novel vector controlled induction motor drives. To overcome the drawbacks of vector and direct torque control algorithms, the proposed vector control algorithm combines the principles of both field oriented control (FOC) or vector control and direct torque control (DTC). The proposed vector control algorithm generates the d- and q-axes reference currents by using the principle of classical vector control. Then, by comparing the reference currents and actual currents error current signals are generated. By using the error signals and lookup tables, the suitable voltage vector will be selected based on the principle of DTC. Thus, the proposed algorithm reduces the complexity when compared with the FOC and reduces the steady state torque ripple when compared with the DTC. In this paper, 6, 12 and 24 sector based lookup tables are proposed for the vector control algorithm. To evaluate the proposed lookup tables based vector control algorithms, numerical simulation studies have been carried out and compared. The results show the effectiveness of the proposed algorithms.