Soft Starting of Three Phase Induction Motor

This project is designed to provide smooth and smooth starting of three-phase asynchronous motors. The three-phase induction motor generates much more current than its initial starting capacity, so the motor immediately reaches full speed. This causes muscle jerks and high electrical loads on the motor windings. Sometimes the coils can burn out. Asynchronous motors should start smoothly and gradually increase speed for safer operation. This project is intended to provide smooth starting of an induction motor powered by SCR ignition which is triggered by a strong ignition delay angle during starting, then gradually reduces the delay until it reaches zero voltage trip. This results in low voltage at start-up and then gradually to full voltage. As a result, the motor starts slowly and then resumes slowly at full speed. This project consists of six counter-parallel SCRs, two for each phase, the output of which is connected to a group of lamps representing the windings of a three-phase induction motor. The charging and discharging of the capacitor is interfaced with the comparator, resulting in a delayed ignition pulse during starting, then gradually reducing the delay until the engine runs at full speed. The output of the comparator is provided by photodetectors to trigger the SCRs.