Soft starter, in fact, is a motor control device with motor soft start, soft stop, light load energy saving and a variety of protection functions.The thyristor and its electronic control circuit are connected in series between the power supply and the controlled motor.By controlling the conduction Angle of the triplex parallel thyristor, the input voltage of the controlled motor can be changed according to different requirements to achieve various functions.
Inverter, which is mainly used for the need of speed regulation, its output not only changes the voltage but also changes the frequency;The soft starter is actually a voltage regulator. When the motor is started, the output changes only the voltage, not the frequency.Inverter manufacturers emphasize that the inverter has all the soft starter functions, but its price is more expensive than the soft starter, the structure is more complex.
Soft starter is used to start and stop the place to buck, then the motor speed is unchanged;But the frequency converter is mainly used for speed regulation, constant pressure, speed by the frequency.According to the inverter manufacturers, the big difference between the two is that the inverter can set the operating frequency arbitrarily, but the soft starter only plays the role of soft start and soft stop.
