At the start of the starting stage, the thyristor is lowered in a very short time with a larger current for a period of time, and then rises linearly according to the original setting
Constant current starting. The starting method is less applied in general load, and is suitable for heavy load and needs to overcome the starting condition of larger static friction. soft
Where is the difference between starting and traditional decompression starting- The traditional decompression starting modes of cage motors are Y-q starting and self coupling decompression starting,
Reactor start, etc.. All of these starting modes belong to the stage of starting with pressure reduction. There are obvious disadvantages, that is, there are two shock currents in the starting process. soft
The difference between starting and traditional decompression starting is: (1) no impact current. Soft starter in the starting motor, by gradually increasing the thyristor
The turn-on angle of the motor causes the motor starting current to rise from zero to the set point. (2) constant current starting. Soft starter can introduce current closed loop control,
Make the motor maintain constant current during starting, and ensure the smooth starting of the motor. (3) according to the load situation and the characteristics of power grid relay protection,
Stepless adjustment from ground to optimum starting current.
Voltage double slope starting
In the starting process, the output torque of the motor increases with the voltage, and provides an initial starting voltage Us at the start, and the Us is adjustable according to the load
The Us is transferred to the static friction torque of the load, so that the load can start rotating at once. The output voltage begins to rise at a certain slope from Us
Adjustable speed, the motor continues to accelerate. When the output voltage reaches the speed voltage of Ur, the motor basically reaches the rated speed. The soft starter is engaged
The speed is automatically detected in the process, and when the motor reaches the rated speed, the output voltage reaches the rated voltage.
