Zhejiang Shuyi Electric Co. Ltd

Soft starter is a novel motor control device that integrates motor soft start, soft stop, light load energy saving and various protection functions. The main composition is a three-phase parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different methods can be used to control the conduction angle of the three-phase parallel thyristor, so that the input voltage of the controlled motor changes according to different requirements, and different functions can be realized.

  The soft starter changes the starting characteristics of the motor by changing the output voltage and boost time. The soft starter uses a three-phase parallel thyristor as a voltage regulator, which is connected between the power supply and the motor stator. Such a circuit is like a three-phase fully-controlled bridge rectifier circuit. When the soft starter is used to start the motor, the output voltage of the thyristor gradually increases, and the motor gradually accelerates until the thyristor is fully turned on, and the motor works on the mechanical characteristics of the rated voltage to achieve smooth starting, reduce starting current, and avoid starting overcurrent tripping.

  When the motor reaches the rated number of revolutions, the starting process is over, and the soft starter automatically replaces the thyristor that has completed the task with a bypass contactor, providing rated voltage for the normal operation of the motor to reduce the heat loss of the thyristor and prolong the service life of the soft starter. , improve its work efficiency, and make the power grid avoid harmonic pollution. The soft starter also provides a soft stop function. The soft stop is the opposite of the soft start process. The voltage gradually decreases and the number of revolutions gradually drops to zero to avoid the torque shock caused by the free stop.

  The difference between soft starter and frequency converter: Soft starter and frequency converter are two completely different products. The frequency converter is used 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 is started, the output only changes the voltage and does not change the frequency. The frequency converter has all the functions of the soft starter, but it is much more expensive and more complicated than the soft starter.

  A soft starter just changes the supply voltage and is equivalent to a step-down starter. The frequency converter is much more complicated and expensive than the soft starter. The frequency converter also has a soft start function, which is realized by changing the frequency of the power supply.


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