International Science and Technology Journal

In this study, the scalar control approach is applied to the control of induction motors three phase. The approach of scalar control is based on the maintaining a constant ratio between voltage-to-frequency (V/f) ratio, both theoretical and simulation-based analyses were performed to examine the performance of the method, which was seen to be successfully applied in speed control for induction machine, making it suitable for various industrial application. Simulations are performed to change the speed by changing the input voltage and changing the input voltage frequency. Finally, the performance of the V/f controlled three-phase induction motor is investigated. Simulations are performed using different speed references and the results are presented.The results show that the V/f controlled three-phase induction motor has good speed tracking performance. The simulations are performed in MATLAB/SIMULING environment...........Keywords: .....Induction motor, speed control, scalar control, closed loop, (V/f) control