The energy-saving level of the frequency converter is mainly reflected in the application of fans and centrifugal pumps. After selecting the wind turbine set and pump load, the energy saving rate is 20%-60% due to the ratio of the specific cost of the wind turbine set to the pump load and the three-square speed ratio. When the average flow required by the user is greater than 1 hour, the fans and pumps use variable frequency speed to reduce their rotational speed, which has significant environmental protection and energy saving effects. However, traditional fan and pump models use baffles and gate valves to adjust the total flow, the motor speed ratio does not change the base, and the power consumption output power conversion is not much. According to relevant statistical analysis, the consumption of fan and pump motors accounts for 31% of national electricity consumption and 50% of industrial production consumption.
Since the inverter is embedded with a 32-bit or 16-bit microcontroller, has a variety of arithmetic or operation functions and intelligent control systems, the output frequency accuracy is 0.1% 0.01%, and has a good test and maintenance stage, the inverter has been widely used in automation technology. For example, in the chemical fiber industry, such as filament machines, tensile tests, metering, wires, laminated glass industry in the production of photovoltaic glass quenching furnaces, laminated glass mixing, edge drawing machines, bottle machines, medium frequency furnace automatic feeding, automatic feeding systems and their elevator car intelligent control systems.
The inverter is widely used in various industrial equipment, such as transmissions, cranes, extruders, CNC lathes, etc., which can improve the technical level and product quality, reduce the impact and noise of mechanical equipment, and increase the service life of mechanical equipment. After selecting the variable frequency speed control, the mechanical structure is simplified, the actual operation is more convenient, and some can change the original processing standards and improve the function of the whole machine. For example, textiles and many fixed machines, the internal temperature is adjusted by changing the amount of warm air feed. The conveying warm air is usually used for the circulation system fan, because the speed of the fan will not change, so the amount of warm air is only used to adjust the intake valve.
The motor hard start will not only cause more serious impact on the power grid, but also continue to adjust the power grid capacity too much, the large current and vibration caused by starting will cause great harm to the partition and gate valve, the use of machinery and equipment, and the pipeline will be very poor. After the application of the inverter, the soft start effect of the inverter will change the starting current from zero to zero, and the maximum value will not exceed the rated voltage, which will reduce the impact on the volume of the power grid and power system, increase the use of machinery and equipment and gate valves, and save maintenance of machinery and equipment.
