The working principle and function of soft starter

- Jul 27, 2017 -

The soft starter is a three-phase anti parallel thyristor used as a voltage regulator between the power supply and the stator of the motor.

This circuit such as three-phase fully controlled bridge rectifier circuit. The start motor using soft starter, the output voltage of the thyristor gradually increase, the motor accelerates gradually until the thyristor wholeconduction motor occupation in the mechanical properties of rated voltage, to achieve a smooth start, reduce the starting current, avoid starting over-current trip.

When the motor reaches the rated speed, the startup process end, soft starter thyristor automatic bypass contactor with substituted completion pipe, provide the rated voltage of the normal operation of the motor, to reduce the heat loss of the thyristor soft starter, prolong the service life, improve the efficiency of the occupation, but also to avoid network harmonic pollution. Starter also provides soft stop function, soft parking and soft start the process on the contrary, the voltage decreased gradually declined to zerorpm avoid free parking the torque caused by impact.

The motor soft starter is the use of power electronic technology, micro processing technology and modern control theory and design is now the international advanced level of new starting equipment production. This product can effectively limit the starting of AC asynchronous motor starting current, can be widely used in fan, water pump, compressor and transportation load, is the traditional star / delta conversion, autotransformer, Buck buck magnetron device ideal products.

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