Design and Simulation of a Three-Phase Induction Motor for Speed Control using Constant V/f Technique with Sinusoidal PWM-Based Inverter
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Induction motor (IM) drives are extensively employed in a wide range of industrial and process control applications due to their robustness, cost-effectiveness, and maintenance-free operation. In high-performance drive systems, precise control of the motor speed is essential to meet stringent dynamic and steadystate requirements. These systems must ensure that the motor speed accurately tracks a predefined reference trajectory, even in the presence of external load disturbances and variations in system parameters. This paper presents an analysis of the speed control system of an induction motor driven by a voltage source inverter (VSI), incorporating a Proportional-Integral (PI) controller into the feedback loop. The control methodology adopts a constant volts-per-hertz (V/f) ratio to ensure efficient motor performance. A comparative evaluation between open-loop and closed-loop configurations of a squirrel-cage rotor type induction motor is done using the Sinusoidal Pulse Width Modulation (SPWM) technique based on MATLAB/Simulink under the Discrete mode of operation. Simulation results confirm that the closed-loop SPWM method outperforms the open-loop SPWM method under load disturbances, rendering it a highly effective strategy for dynamic industrial applications.
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