how soft starters work
Quick Answer. A soft starter controls the acceleration of an electric motor by controlling the applied voltage. A soft starter also reduces the internal stress of the electric motor by reducing powertrain torque and load.
Now let us shift our particular attention to soft starting. In technical terms, a soft starter is any device which reduces the torque applied to the electric motor. It generally consists of solid state devices like thyristors to control the application of supply voltage to the motor.