Application of Sunwoele high-pressure VFD (Variable-frequency Drive) in conveying machinery

In the middle of the 19th century, conveyor belt conveyors of various modern structures appeared one after another. This is a friction-driven machine that transports materials in a continuous manner. It can form a material conveying process from the initial feeding point to the final discharging point on a certain conveying line. It can carry out both The transportation of broken materials can also be carried out in pieces, and can also be matched with the requirements of the technological process in the production process of various industrial enterprises to form a rhythmic assembly line. It is precisely because of such advantages that the transportation Machinery is widely used in various modern industrial enterprises.

In 1868, belt conveyors appeared in the UK, in 1887, screw conveyors appeared in the United States, in 1905, steel belt conveyors appeared in Switzerland, and in 1906, inertial conveyors appeared in the UK and Germany. Since then, the conveyor belt conveyor has been continuously improved under the influence of technological progress in machinery manufacturing, electrical machinery, chemical industry and metallurgical industry. An integral part of the mechanization and automation of material handling systems.

With the rapid development of power electronics technology, microelectronics technology and computer technology, frequency conversion speed regulation technology and vector control technology have been improved day by day. With the continuous maturity of frequency conversion speed control technology, the application of frequency conversion speed control devices on belt conveyors is becoming more and more extensive. The application of VFD (Variable-frequency Drive) on belt conveyors is one example. Various advantages of VFD (Variable-frequency Drive) determine its wide application in conveying machinery:

1. The squirrel-cage induction motor can be used. This type of motor has a small body and can be used like a mechanical transmission without the space of the transmission part. The drive is small and light.

2. Improve production performance: use VFD (Variable-frequency Drive) to drive a wide range of speed control from 1:10 to 1:20, which can be done by changing the frequency command by remote control. Therefore, it is easy to choose the most suitable speed for the work.

3. It can start and stop smoothly. If the speed of the conveyor belt is changed rapidly, the objects to be conveyed will collapse. For example, if the glass bottle is suddenly stopped, the bottle will collide with each other and may be damaged; but if the VFD (Variable- Frequency Drive) operation, because it starts at a low frequency, so the vibration is small, and then adjusted by soft control, the whole process can be smooth and smooth.

With its excellent performance and advantages, VFD (Variable-frequency Drive) has shaken the long-term dominance of the DC speed control system in the speed control system.

The AMB-HVI6000V\10000Y belt conveyor special series produced by Sunwoele VFD (Variable-frequency Drive) company is one of them. It is a power module series multi-level superposition voltage independently developed, designed and produced by Chengdu Sunwoele Co., Ltd. Source type high-voltage VFD (Variable-frequency Drive) is also one of the series of high-voltage VFD (Variable-frequency Drive) with perfect sine wave output. , start and run synchronously, automatically set the excitation current of the synchronous motor, keep the angle between the armature voltage vector and the rotor magnetic pole position within a certain range, ensure that the power factor is close to 1, and prevent the synchronous machine from running out of step. , so that the frequency conversion stepless speed regulation of the synchronous motor within the rated speed solves the phenomenon of high current impact or unsuccessful switching after the synchronous motor starts asynchronously and close to the sub-synchronous speed before the transformation, and also solves the problem that the high-voltage synchronous motor cannot be started frequently Disadvantages of stopping.

This series of high-voltage VFD (Variable-frequency Drive) is composed of high-voltage bypass cabinet, phase-shifting rectifier transformer cabinet, power and control cabinet, synchronous excitation cabinet and other parts. It is a "high-high" type VFD (Variable-frequency Drive). Direct input, high voltage direct output, no step-up transformer required. The VFD (Variable-frequency Drive) input uses an isolated phase-shifting rectifier transformer, which has little harmonic pollution to the power grid. The power conversion part on the output side adopts a multi-power module series topology structure, and several independent low-voltage variable frequency power modules are output in series. High-voltage direct output is realized by means of multi-level output, which makes the output voltage waveform of VFD (Variable-frequency Drive) very close to sine wave, without output filter, and can directly drive high-voltage motor to run. All frequency conversion power modules have the same shape and function , all power modules are fully interchangeable.

VFD (Variable-frequency Drive) has so many advantages. It is believed that with the development of high-tech technology, VFD (Variable-frequency Drive) will have a greater use in the field of conveying machinery.