Soft Starting Simulation Model for Asynchronous Motors in Simulink

This documentation provides an in-depth exploration of the Simulink simulation model for soft starting of asynchronous motors. We will systematically analyze each implementation step and component configuration, including key Simulink blocks such as Three-Phase Source, Asynchronous Machine, and Soft Starter controllers. The model incorporates voltage ramp control algorithms through MATLAB Function blocks to gradually increase stator voltage, reducing initial torque surges. Technical implementation details cover the use of Lookup Tables for characteristic curve modeling and PID controllers for closed-loop current regulation. Practical engineering applications demonstrate how to configure simulation parameters like ramp time (typically 2-10 seconds) and initial voltage settings (30-70% of nominal voltage) using Simulink's mask functionality. Case studies include industrial conveyor systems and pump control scenarios, showing how to adapt the model for different motor power ratings using parameterized subsystems. The article concludes with guidance on implementing protection circuits and performance validation through Simulink's Powergui tool for FFT analysis of starting current harmonics. Through this technical walkthrough, engineers will gain comprehensive understanding of developing and customizing soft-start simulation models for various industrial applications using MATLAB/Simulink's physical modeling capabilities.