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).
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
Soft start connection drawing Decompression start connection drawing
The reason why the soft starter is superior to the Star-Triangle starter and the self-coupling decompression starter is that it has many functions, such as "intelligence quotient", the realization of man-machine "dialogue", and the remote operation through the keyboard, computer or manual, not only soft stop can be realized, but also it has many protection functions. These are new humanized equipment requirements, so it is highly respected.
The soft starter adopts the current control loop to track and detect the current change of the motor at any time. The overload protection function is realized by adding the setting of overload current and the anti-time-limited control mode. Turn off the thyristor and issue an alarm signal when the motor is overloaded.
When it works, the soft starter detects the change of three-phase current at any time, once the current is cut off, a phase loss protection response can be made.
The temperature of the thyristor radiator is detected by the thermal relay inside the soft starter. Once the temperature of the radiator exceeds the allowable value, the thyristor is automatically turned off and an alarm signal is issued.
Through the combination of electronic circuits, other kinds of chain protection can be implemented in the system.
We Dongqi crane have overhead crane, gantry crane, jib crane, electric hoist and winch. The motor of all products has soft start now. Dongqi crane has strong technical team. Dongqi crane has been committed to the upgrading of product technology, and Dongqi crane is at the forefront of technology. So you can choose Dongqi crane safety if you need crane equipment.
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