Energy feedback device suppliers remind you that frequency converters are widely used, divided into low-voltage frequency converters and medium high voltage frequency converters according to voltage levels. The purpose and requirements of each industry's application vary.
1、 Application of frequency converters in energy-saving aspects of frequency conversion
The energy-saving aspect of frequency converters is reflected in the application of fans and pumps. After adopting variable frequency speed regulation, the energy-saving rate of fans and pump loads is 20% to 60%, because the actual power consumption of fans and pump loads is basically proportional to the third power of the speed. When the average flow rate required by users is small, fans and pumps use variable frequency speed regulation to reduce their speed, which has a significant energy-saving effect. However, traditional fans and pumps use baffles and valves for flow regulation, with the motor speed remaining basically unchanged and the power consumption not changing much. According to relevant statistics, the electricity consumption of fan and pump motors accounts for 31% of the national electricity consumption and 50% of industrial electricity consumption. The use of variable frequency speed regulation devices on such loads is of great significance. Currently, successful applications include constant pressure water supply, various types of fans, central air conditioning, and hydraulic pump variable frequency speed regulation.
2、 Application of frequency converter in automation system
Due to the built-in 32-bit or 16 bit microprocessor in the frequency converter, which has various arithmetic logic operations and intelligent control functions, the output frequency accuracy is 0.1%~0.01%, and it is equipped with complete detection and protection links, so the frequency converter is widely used in automation systems. For example, winding, stretching, measuring, and wire guiding in the chemical fiber industry, flat glass annealing furnaces, glass kiln mixing, edge drawing machines, bottle making machines in the glass industry, automatic feeding and batching systems for electric arc furnaces, and intelligent control of elevators.
3、 The application of frequency converters in improving process level and product quality
Variable frequency drives are widely used in various mechanical equipment control fields such as transmission, lifting, extrusion, and machine tools. They can improve process level and product quality, reduce equipment impact and noise, and extend equipment service life. After adopting frequency conversion speed control, the mechanical system is simplified, operation and control are more convenient, and some can even change the original process specifications to improve the functionality of the entire equipment. For example, in textile and many other industries, the temperature inside the shaping machine is adjusted by changing the amount of hot air sent in. Circulating fans are usually used for conveying hot air, and since the fan speed remains constant, the amount of hot air sent can only be adjusted by the air damper.
If the air door adjustment fails or is not adjusted properly, it will cause the molding machine to lose control and affect the quality of the finished product. When the circulating fan starts 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, temperature adjustment can be achieved 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 wear between the drive belt and bearings, extend the service life of the equipment, and save 40% energy.
4、 Application of frequency converter in achieving motor soft start
Hard starting of motors not only causes serious impact on the power grid, but also demands excessive capacity from the grid. The high current and vibration generated during starting cause significant damage to the baffles and valves, which is detrimental to the service life of equipment and pipelines. After using the frequency converter, the soft start function of the frequency converter will cause the starting current to change from zero, and the maximum value will not exceed the rated current, reducing the impact on the power grid and the requirement for power supply capacity, extending the service life of equipment and valves, and also saving equipment maintenance costs.