Frequency conversion saves energy
The energy saving of the inverter is mainly manifested in the application of fans and pumps. After the fan and pump load adopts frequency conversion speed regulation, the power saving rate is 20%~60%, because the actual power consumption of the fan and pump load is basically proportional to the third square of the speed. When the average flow rate required by users is small, fans and pumps use frequency conversion speed regulation to reduce their speed, and the energy-saving effect is very obvious. However, traditional fans and pumps use baffles and valves for flow adjustment, and the motor speed is basically unchanged, and the power consumption does not change much. According to statistics, the electricity consumption of fans and pump motors accounts for 31% of the country's electricity consumption and 50% of industrial electricity consumption. It is of great significance to use variable frequency speed control devices on such loads. At present, the more successful applications include constant pressure water supply, various types of fans, central air conditioning and hydraulic pump frequency conversion speed regulation.
Applications in automation systems
Because the inverter has a built-in 32-bit or 16-bit microprocessor, with a variety of arithmetic logic operations and intelligent control functions, the output frequency accuracy is 0.1%~0.01%, and it is set up with perfect detection and protection links, so it is widely used in automation systems. For example: winding, stretching, metering, guide wire in the chemical fiber industry; Flat glass annealing furnace, glass kiln stirring, edge pulling machine, bottle making machine in the glass industry; Automatic feeding of electric arc furnace, batching system and intelligent control of elevator. The application of frequency inverters to improve the level of process and product quality in CNC machine tool control, automotive production lines, papermaking and elevators.
Application in improving process level and product quality
Frequency converter can also be widely used in transmission, lifting, extrusion and machine tool and other mechanical equipment control fields, it can improve the process level and product quality, reduce the impact and noise of the equipment, extend the service life of the equipment. After the use of frequency conversion speed control control, the mechanical system is simplified, the operation and control are more convenient, and some can even change the original process specifications, thereby improving the function of the entire equipment. For example, in textile and many industries, the temperature in the machine is adjusted by changing the amount of hot air sent. The transmission of hot air is usually used by a circulating fan, because the speed of the fan does not change, the amount of hot air sent into it can only be adjusted by a damper. If the damper adjustment fails or is not adjusted properly, it will cause the stenter to lose control, thus affecting the quality of the finished product. The circulating fan starts at high speed, and the wear between the drive belt and the bearing is very serious, making the transmission belt a consumable. After adopting frequency conversion speed regulation, temperature adjustment can be achieved by automatically adjusting the speed of the fan by the frequency converter, which solves the product quality problem. 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, and also extend the service life of the equipment and save energy by 40%.
Realize soft start of the motor
Hard start of the motor will not only cause serious impact on the power grid, but also will have too high requirements for the capacity of the power grid, and the large current and vibration generated during the start will cause great damage to the baffle and valve, and the service life of the equipment and pipelines will be extremely unfavorable. After using the inverter, the soft start function of the inverter will make the starting current change from zero, and the maximum value will not exceed the rated current, which reduces the impact on the power grid and the requirements for power supply capacity, prolongs the service life of equipment and valves, and also saves equipment maintenance costs.