Soft starter is a novel motor control device that integrates motor soft start, soft stop, light load energy saving and multiple protection functions. It is called Soft Starter abroad. Its main composition is a three reverse parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different methods are used to control the conduction angle of the three opposite parallel thyristors, so that the input voltage of the controlled motor changes according to different requirements, and different functions can be achieved. Soft starters and frequency converters are two completely different products. The inverter is used in places where speed regulation is required, and its output not only changes the voltage but also the frequency; the soft starter is actually a voltage regulator. When the motor starts, the output only changes the voltage and does not change the frequency. The inverter has all the functions of a soft starter, but it is much more expensive than a soft starter and its structure is much more complicated.
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