Soft starter is a new motor control device, which integrates soft start of motor, soft stop, light load, energy saving and various protection functions. It is called Soft Starter abroad. Its main structure is a three-phase anti parallel thyristor connected to the power supply and the controlled motor and its electronic control circuit.
Different methods are adopted to control the conduction angle of the three-phase anti parallel thyristor, so that the input voltage of the controlled motor varies according to different requirements, and different functions can be realized.
Based on the soft starter is connected between the power supply and controlled motor, control the turn-on angle of thyristor, the motor input voltage from zero to a preset function increased gradually, until the start end, with full voltage motor, namely soft starter, soft starter in the process, the motor starting torque increases gradually, speed increased gradually.
