(soft starter) is a new motor control device, which integrates soft starting of motor, soft stop, light load, energy saving and many kinds of protection functions
Abroad, it is called Soft Starter. The soft starter adopts a three-phase anti parallel thyristor as a voltage regulator and is connected between the power supply and the motor stator.
This circuit, such as three-phase full controlled bridge rectifier circuit. When the motor is started by using a soft starter, the output voltage of the thyristor is gradually increased
Gradually accelerating until the thyristor is fully conducted, the motor operates at rated voltage on mechanical characteristics to achieve a smooth start, reduce the starting current, and avoid
Starting overcurrent trip. When the motor reaches the rated speed, the start process is over, and the soft starter automatically replaces the finished crystal with the bypass contactor
The utility model provides a rated voltage for the normal operation of the motor, so as to reduce the heat loss of the thyristor, prolong the service life of the soft starter and improve the work of the utility model
The efficiency also makes the grid avoid harmonic pollution. The soft starter also provides a soft stop function, and the soft stop is opposite to the soft start process
Gradually decrease, the revolution gradually drops to zero, avoiding the torque impact caused by free parking.