1、 Application of frequency converter in frequency conversion and energy saving

The energy saving of frequency converter is reflected in the application of fan and water pump. After variable frequency speed regulation is adopted for fan and pump loads, the power saving rate is 20% ~ 60%, because the actual power consumption of fan and pump loads is basically proportional to the third power of speed. When the average flow required by users is small, fans and pumps adopt frequency conversion speed regulation to reduce their speed, and the energy-saving effect is obvious. The traditional fans and pumps use baffles and valves for flow regulation, the motor speed is basically unchanged, and the power consumption changes little. According to relevant statistics, the power consumption of fans and pump motors accounts for 31% of the national power consumption and 50% of the industrial power consumption. It is of great significance to adopt variable frequency speed regulation devices for such loads. At present, the more successful applications are variable frequency speed regulation of constant pressure water supply, various fans, central air conditioning and hydraulic pumps.

2、 Application of frequency converter in automation system

Because the frequency converter has built-in 32-bit or 16 bit microprocessor, has a variety of arithmetic and logic operation and intelligent control functions, the output frequency accuracy is 0.1% ~ 0.01%, and is equipped with perfect detection and protection links, the frequency converter is widely used in the automation system. For example: winding, stretching, metering and wire guide in chemical fiber industry, flat glass annealing furnace, glass kiln mixing, edge drawing machine, bottle making machine in glass industry, automatic feeding and batching system of electric arc furnace, intelligent control of elevator, etc.

3、 Application of frequency converter in improving process level and product quality

Frequency converter is widely used in the control fields of various mechanical equipment such as transmission, lifting, extrusion and machine tools. It can improve the process level and product quality, reduce the impact and noise of equipment and prolong the service life of equipment. After adopting frequency conversion speed regulation control, the mechanical system is simplified and the operation and control are more convenient. Some can even change the original process specifications to improve the function of the whole equipment. For example, in the setting machine used in textile and many industries, the temperature in the machine is adjusted by changing the amount of hot air. The circulating fan is usually used for conveying hot air. Because the fan speed remains unchanged, the amount of hot air can only be adjusted by the damper.

Failure or improper adjustment of the damper will cause the setting machine to lose control and affect the quality of the finished product. When the circulating fan is started at high speed, the wear between the drive belt and the bearing is very severe, making the drive belt a consumable. After adopting frequency conversion speed regulation, the temperature regulation can be realized by automatically adjusting the speed of the fan through the frequency converter, which solves the problem of product quality. In addition, the frequency converter can easily start the fan at low frequency and low speed, reduce the wear between the drive belt and the bearing, prolong the service life of the equipment, and save energy by 40%.

4、 Application of frequency converter in realizing motor soft start

The hard start of the motor will not only cause serious impact on the power grid, but also have too high requirements for the power grid capacity. The large current and vibration generated during start-up will cause great damage to the baffle and valve, and is very unfavorable to the service life of the equipment and pipeline. After using the frequency converter, the soft start function of the frequency converter will change the starting current from zero, and the maximum value will not exceed the rated current, reduce the impact on the power grid and the requirements for power supply capacity, prolong the service life of equipment and valves, and save equipment maintenance costs.

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