In order to facilitate speed regulation, the hoisting, crane and trolley motors of domestic, Soviet and traditional cranes usually use wound motors. Because its rotor is open circuit, it can be connected through external resistance box and controller to realize the switching of different speeds. However, such speed regulation can only realize step speed regulation, and the rotor can be energized only through the contact between slip ring and carbon brush, Therefore, in use, the carbon brush and slip ring are worn to a large extent, and the resistance box for speed regulation is the part with large maintenance, so it is not very reliable; The appearance of frequency converter, especially the vector frequency converter specially used for lifting, can replace some external components such as slip ring, carbon brush, resistance box, time relay, contactor and so on, which greatly reduces the external equipment of electric control part, so as to achieve the purpose of reducing fault and mechanism wear.
The frequency converter can adjust the speed at any time, so as to realize stepless speed regulation, and the operation of users is more simple and accurate. In addition, many protection settings inside the frequency converter can provide comprehensive protection for the efficient and safe operation of the motor, which is suitable for repeated inching operation and convenient for accurate control.
It is worth mentioning that using frequency converter to control these motors can also save a lot of electric energy on the premise of ensuring that the torque can meet the requirements, so as to achieve the purpose of energy conservation and environmental protection.
The lifting motor of single beam crane can be a conical motor, and the double beam crane is an ordinary asynchronous motor. The conical motor is equipped with automatic braking device. When the power is cut off, the friction torque is generated by the pressure spring on the rotor, and the braking can stop the motor in a short time. Therefore, the frequency converter controlling the lifting motor does not need special brake control logic, but needs strong and fast lifting torque and overload capacity to start the motor normally and smoothly lift the weight without sliding down; In the process of deceleration parking, after deceleration parking, combined with DC braking, stable deceleration parking can be realized with small mechanical impact. For ordinary asynchronous motors, stable and reliable brake control logic is required. The special frequency converter for hoisting has professional crane function and perfect and reliable brake control sequence to ensure that heavy objects will not slip down when the brake is released and closed.
One kind of equipment corresponds to many suppliers, and another kind of equipment also corresponds to many configurations, so the single beam crane has the cheapest, good and best distinction. Now, many household appliances have applied frequency conversion control, and the same is true for lifting equipment. Today, I will introduce the application of frequency conversion configuration of single beam crane.
The variable frequency speed regulation system of the crane has the advantages of fast starting and braking, stable starting process, stable and reliable operation, simple and dexterous operation, high consumption efficiency, convenient system protection and high safety.
When the crane falls on the hook, the frequency converter will be subject to the energy release process of high potential. In order to protect the frequency converter from being damaged, an energy consumption braking unit is added to protect the normal task of the frequency converter. During braking, the discharge resistance and the internal active power loss of the motor locally combine to form the braking torque, which is about 20% of the rated torque.
When the frequency converter is put into operation, the setting of functional parameters of the frequency converter is indirectly related to whether the frequency converter and equipment can cooperate properly. If a set parameter is unreasonable, the inverter task is abnormal or abnormal conditions such as motor overheating occur and damage the electrical equipment. During operation, pay attention to the fastening and moisture-proof of the frequency converter to ensure the safe operation of the frequency converter
The development of frequency conversion skills of mechanical equipment and PLC skills provides favorable conditions for the frequency conversion of single beam crane. In the future, any equipment will move towards the latest scientific and technological research and development, starting from energy saving, power saving, safety, user experience and other aspects. You are welcome to make more comments!
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