<![CDATA[This study investigates the operating and transient performance of a 315 kW three-phase induction motor used to drive an extruder in a fish-feed production system. MATLAB/Simulink simulations were conducted to compare direct-on-line (DOL), soft-starter, and variable-frequency (V/f) operating methods under no-load, different mechanical-load, and load-change conditions. The evaluation considered rotor speed, stator root-mean-square (RMS) current at the end of the simulation, and transient response characteristics. The results indicate that the performance of each method depends on the operating load and the type of load transition. Under no-load conditions, all three methods achieved a rotor speed of approximately 1499 rpm, although their reported rise times, settling times, and final RMS currents differed. Under increasing mechanical loads, rotor speed generally decreased while the final RMS current increased. The load-change simulations further demonstrated that no single method consistently provided the most favorable response across all evaluated conditions. These findings provide a comparative assessment of the three methods within the specified MATLAB/Simulink model. Since experimental measurements from the actual motor were not available, the results represent simulation-based findings and do not constitute experimental validation.]]>
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