Soft start crane motor or decompression start crane motor? What is the difference between the two types of crane motors? Why the soft star crane motor is superior that decompression start crane motor? Check overhead crane equipment engineer’s explanation on crane motors now.
As a new generation of industrial control mode, the soft starting of motor is widely used in crane equipment. The rotor current of the three-phase asynchronous motor is usually 5 ~ 8 times higher than that of the rated state. Since the rotor current is induced from the stator winding, the current in the stator winding is increased to 4~7 times of the rated current. Such a large start-up current will have the following adverse consequences: fluctuating the grid voltage (especially when the larger motor starts).
Difference of soft start and conventional decompression motor
What is the difference between the soft start and the conventional decompression start of motor?
Soft start motor Decompression start motor - Dongqi types of crane sparts and crane components
1) No impulse current. When the soft starter starts the motor, the starting current of the motor rises from zero linear to the set value by increasing the thyristor conduction angle gradually.
2) Constant current start. The soft starter can introduce the current closed loop control to keep the constant current in the starting process of the motor and ensure the steady start of the motor.
3) According to the load condition and relay protection characteristics, the optimal starting current can be adjusted freely and continuously.
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